From patchwork Wed Oct 21 08:56:40 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11848603 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E7BEF14B2 for ; Wed, 21 Oct 2020 08:57:08 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 8F63621D6C for ; Wed, 21 Oct 2020 08:57:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="Hd5qr7pZ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8F63621D6C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 540816B0062; Wed, 21 Oct 2020 04:57:06 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 4C8DD6B0068; Wed, 21 Oct 2020 04:57:06 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 31D826B006C; Wed, 21 Oct 2020 04:57:06 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0002.hostedemail.com [216.40.44.2]) by kanga.kvack.org (Postfix) with ESMTP id E379B6B0062 for ; Wed, 21 Oct 2020 04:57:05 -0400 (EDT) Received: from smtpin03.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 8218E4820 for ; Wed, 21 Oct 2020 08:57:05 +0000 (UTC) X-FDA: 77395328010.03.bell37_4d1367a27247 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin03.hostedemail.com (Postfix) with ESMTP id 5820028A4E8 for ; Wed, 21 Oct 2020 08:57:05 +0000 (UTC) X-Spam-Summary: 1,0,0,2a01e8285d3dd7ce,d41d8cd98f00b204,daniel.vetter@ffwll.ch,,RULES_HIT:41:69:152:355:379:541:800:960:966:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1535:1544:1593:1594:1711:1730:1747:1777:1792:2196:2199:2393:2553:2559:2562:3138:3139:3140:3141:3142:3355:3865:3866:3867:3873:3874:4119:4321:4385:4605:5007:6119:6261:6609:6653:6742:6743:7875:7903:8603:9010:9036:9592:10004:11026:11473:11657:11658:11914:12043:12296:12297:12438:12517:12519:12555:12895:12986:13846:13894:14181:14394:14659:14721:21080:21444:21451:21627:21773:21795:21990:30051:30054:30064:30090,0,RBL:209.85.221.68:@ffwll.ch:.lbl8.mailshell.net-66.201.201.201 62.8.0.100;04yft8tgd5ogkdher9g891iaw4wqfoc6r3rzzf8cuys9gjpfqyrbk3tt4kmrgys.1jrec6p63i1mshaozq5o3djq5kycheoqdzig9u4ap6ffo5og3reu7d8xny13mo7.e-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:none,Custom_rules:0:0:0,LFtime:24,LUA_SUMMARY:none X-HE-Tag: bell37_4d1367a27247 X-Filterd-Recvd-Size: 8345 Received: from mail-wr1-f68.google.com (mail-wr1-f68.google.com [209.85.221.68]) by imf48.hostedemail.com (Postfix) with ESMTP for ; Wed, 21 Oct 2020 08:57:04 +0000 (UTC) Received: by mail-wr1-f68.google.com with SMTP id h5so2080066wrv.7 for ; Wed, 21 Oct 2020 01:57:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=K95D/JeFvwIRswqJ5AyZx2c3o+Go5rbi2d1Aft3apVY=; b=Hd5qr7pZZO1AF760IHt5p0pXKDL2hqdJ3sUJVr7XIGUMaqaAvNysYEec4f09iASZfR NNiTDBnpFl36ANaTjQP9R6ClT5cy809US9aIQXED4/OldrY173V7OBDkje/vz4pn3KvB rgWsXHgy+UPbTuurH+E1eCmRcP1XEOsN6bb/U= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=K95D/JeFvwIRswqJ5AyZx2c3o+Go5rbi2d1Aft3apVY=; b=YUXfm+jRrQbRPAEik3RNEyISN6tRUG9kPxButmc+UAPMqbvfQeILfCcicXNW8k2s1T hOY18cCg8EA51s7kLXEW/Q4Cv6fl8a1jIWIi3Rkd3c6RPJNdBsaqPm8ZS7N7ePH+7hFC vLjN+uQZaJzjqPKOnMGprQHFsCSbOh0zshOq7Yshu+hSiYT1GL665U9jUvyeWaK/0Br3 YDnbkn4yXM+Qidyea4CZP+kjRa+9blwCwKvLP02KATIP8UIkgQv36zkRM3CiXoj5L2dN oBHQ7jcNbPedY76TXyKhELGLtagES23qRebAV1I2vO83kllKhG/LjN0vAEfsOA50c3j5 I3xg== X-Gm-Message-State: AOAM531OQDQN51ZyrUTexkRojok1BkWxXDiDzNIkEjpyE4I5EUrQ1Yws WFVAL+iRuUlLbFzkTqmtWqr77w== X-Google-Smtp-Source: ABdhPJw2XMtVnZfoQx45xaQNDg3qnrf6WmNn/N8qNOBOueDi4hxOOcHlcdccOX48m/SzW3eHWMyAJw== X-Received: by 2002:a5d:4dc1:: with SMTP id f1mr3452736wru.42.1603270623303; Wed, 21 Oct 2020 01:57:03 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id q8sm2675939wro.32.2020.10.21.01.57.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2020 01:57:02 -0700 (PDT) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Vetter , John Hubbard , Daniel Vetter , Jason Gunthorpe , Inki Dae , Joonyoung Shim , Seung-Woo Kim , Kyungmin Park , Kukjin Kim , Krzysztof Kozlowski , Andrew Morton , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Dan Williams , Daniel Vetter Subject: [PATCH v3 01/16] drm/exynos: Stop using frame_vector helpers Date: Wed, 21 Oct 2020 10:56:40 +0200 Message-Id: <20201021085655.1192025-2-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> References: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: All we need are a pages array, pin_user_pages_fast can give us that directly. Plus this avoids the entire raw pfn side of get_vaddr_frames. Reviewed-by: John Hubbard Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Inki Dae Cc: Joonyoung Shim Cc: Seung-Woo Kim Cc: Kyungmin Park Cc: Kukjin Kim Cc: Krzysztof Kozlowski Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Signed-off-by: Daniel Vetter --- v2: Use unpin_user_pages_dirty_lock (John) --- drivers/gpu/drm/exynos/Kconfig | 1 - drivers/gpu/drm/exynos/exynos_drm_g2d.c | 47 +++++++++++-------------- 2 files changed, 20 insertions(+), 28 deletions(-) diff --git a/drivers/gpu/drm/exynos/Kconfig b/drivers/gpu/drm/exynos/Kconfig index 6417f374b923..43257ef3c09d 100644 --- a/drivers/gpu/drm/exynos/Kconfig +++ b/drivers/gpu/drm/exynos/Kconfig @@ -88,7 +88,6 @@ comment "Sub-drivers" config DRM_EXYNOS_G2D bool "G2D" depends on VIDEO_SAMSUNG_S5P_G2D=n || COMPILE_TEST - select FRAME_VECTOR help Choose this option if you want to use Exynos G2D for DRM. diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c index 967a5cdc120e..ecede41af9b9 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c +++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c @@ -205,7 +205,8 @@ struct g2d_cmdlist_userptr { dma_addr_t dma_addr; unsigned long userptr; unsigned long size; - struct frame_vector *vec; + struct page **pages; + unsigned int npages; struct sg_table *sgt; atomic_t refcount; bool in_pool; @@ -378,7 +379,6 @@ static void g2d_userptr_put_dma_addr(struct g2d_data *g2d, bool force) { struct g2d_cmdlist_userptr *g2d_userptr = obj; - struct page **pages; if (!obj) return; @@ -398,15 +398,9 @@ static void g2d_userptr_put_dma_addr(struct g2d_data *g2d, dma_unmap_sgtable(to_dma_dev(g2d->drm_dev), g2d_userptr->sgt, DMA_BIDIRECTIONAL, 0); - pages = frame_vector_pages(g2d_userptr->vec); - if (!IS_ERR(pages)) { - int i; - - for (i = 0; i < frame_vector_count(g2d_userptr->vec); i++) - set_page_dirty_lock(pages[i]); - } - put_vaddr_frames(g2d_userptr->vec); - frame_vector_destroy(g2d_userptr->vec); + unpin_user_pages_dirty_lock(g2d_userptr->pages, g2d_userptr->npages, + true); + kvfree(g2d_userptr->pages); if (!g2d_userptr->out_of_list) list_del_init(&g2d_userptr->list); @@ -474,35 +468,34 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct g2d_data *g2d, offset = userptr & ~PAGE_MASK; end = PAGE_ALIGN(userptr + size); npages = (end - start) >> PAGE_SHIFT; - g2d_userptr->vec = frame_vector_create(npages); - if (!g2d_userptr->vec) { + g2d_userptr->pages = kvmalloc_array(npages, sizeof(*g2d_userptr->pages), + GFP_KERNEL); + if (!g2d_userptr->pages) { ret = -ENOMEM; goto err_free; } - ret = get_vaddr_frames(start, npages, FOLL_FORCE | FOLL_WRITE, - g2d_userptr->vec); + ret = pin_user_pages_fast(start, npages, FOLL_FORCE | FOLL_WRITE, + g2d_userptr->pages); if (ret != npages) { DRM_DEV_ERROR(g2d->dev, "failed to get user pages from userptr.\n"); if (ret < 0) - goto err_destroy_framevec; - ret = -EFAULT; - goto err_put_framevec; - } - if (frame_vector_to_pages(g2d_userptr->vec) < 0) { + goto err_destroy_pages; + npages = ret; ret = -EFAULT; - goto err_put_framevec; + goto err_unpin_pages; } + g2d_userptr->npages = npages; sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); if (!sgt) { ret = -ENOMEM; - goto err_put_framevec; + goto err_unpin_pages; } ret = sg_alloc_table_from_pages(sgt, - frame_vector_pages(g2d_userptr->vec), + g2d_userptr->pages, npages, offset, size, GFP_KERNEL); if (ret < 0) { DRM_DEV_ERROR(g2d->dev, "failed to get sgt from pages.\n"); @@ -538,11 +531,11 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct g2d_data *g2d, err_free_sgt: kfree(sgt); -err_put_framevec: - put_vaddr_frames(g2d_userptr->vec); +err_unpin_pages: + unpin_user_pages(g2d_userptr->pages, npages); -err_destroy_framevec: - frame_vector_destroy(g2d_userptr->vec); +err_destroy_pages: + kvfree(g2d_userptr->pages); err_free: kfree(g2d_userptr); From patchwork Wed Oct 21 08:56:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11848605 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 43EAC14B4 for ; Wed, 21 Oct 2020 08:57:11 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id CD57E21D6C for ; Wed, 21 Oct 2020 08:57:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="ExhcwVuF" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CD57E21D6C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 651EA6B0068; Wed, 21 Oct 2020 04:57:07 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 609A46B006C; Wed, 21 Oct 2020 04:57:07 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4A55C6B006E; Wed, 21 Oct 2020 04:57:07 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0113.hostedemail.com [216.40.44.113]) by kanga.kvack.org (Postfix) with ESMTP id 14C646B0068 for ; Wed, 21 Oct 2020 04:57:07 -0400 (EDT) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id A8E73180AD807 for ; Wed, 21 Oct 2020 08:57:06 +0000 (UTC) X-FDA: 77395328052.01.range74_331278727247 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin01.hostedemail.com (Postfix) with ESMTP id 87720100473C2 for ; Wed, 21 Oct 2020 08:57:06 +0000 (UTC) X-Spam-Summary: 1,0,0,0cb60cbbaeae7e17,d41d8cd98f00b204,daniel.vetter@ffwll.ch,,RULES_HIT:41:152:355:379:541:800:960:966:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1535:1541:1593:1594:1711:1730:1747:1777:1792:2196:2199:2393:2553:2559:2562:2919:3138:3139:3140:3141:3142:3352:3865:3871:3872:4385:5007:6261:6653:6742:6743:10004:10400:11026:11473:11657:11658:11914:12043:12296:12297:12438:12517:12519:12555:12895:13069:13161:13229:13311:13357:13846:13894:14096:14097:14181:14394:14659:14721:21080:21251:21444:21451:21627:30054:30064:30090,0,RBL:209.85.221.67:@ffwll.ch:.lbl8.mailshell.net-62.8.0.100 66.201.201.201;04yrbd8x9tyu5rpsxpn5ojyqc5kw8op4qq1ashnry3t6p5dkrmk3gfme9f7bzxu.im8zaxgg4a997skdohecskk58xfa13yrucn4w1oy9n1wqwe5uh3suc4pzfrwq7u.s-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:none,Custom_rules:0:0:0,LFtime:24,LUA_SUMMARY:none X-HE-Tag: range74_331278727247 X-Filterd-Recvd-Size: 5119 Received: from mail-wr1-f67.google.com (mail-wr1-f67.google.com [209.85.221.67]) by imf32.hostedemail.com (Postfix) with ESMTP for ; Wed, 21 Oct 2020 08:57:05 +0000 (UTC) Received: by mail-wr1-f67.google.com with SMTP id s9so2074336wro.8 for ; Wed, 21 Oct 2020 01:57:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=MzLc+nXcpvkOQiq6BkCYlPPhN6+7Fey8ddI3JwNu2z0=; b=ExhcwVuFro8r01Sz5/fOgu0MdAgS0lDexZuz+TZgZJBaeW+gUwRZt3CgPKBk+71vuL YdtxzMhDjriD2GGLlLdcf06cZZ1rNKPob0lIbVsDWxLXuFz+XMa24vqfVJ3XdOaz9J4K zX76LvbtYA7KgjjC8Hmo9CXXR9u8aU0b4xKXM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=MzLc+nXcpvkOQiq6BkCYlPPhN6+7Fey8ddI3JwNu2z0=; b=BobVAvG7noxXX5AY2gozkT18sKDR6DJ8oodnPTOR4SFJMjDqoq6Rw53UQ8zvvJe4wa mvsMjGeOE1lGK9D2rWZYPsRPQdgA2BLX1xhB1xdO6wl0eHg3dvLRi3S5AzdbdvI8oTAH 9/Vhd+zdqX5PUpXEBrLbxB+swAaELG3MJPMpO5cfw6z8qt7apkjEC22/gYghaPhyLYv+ pWX6MJxPOPy+TEQSslyHqP1n3p530Ov6M0lRSAIR4V/q3948ZKuH6jhmcDxmCVR2O9Gz NvRBdCLaGiZm5WyGL3XqT4SR2a+HheNMjd19lOHvNd4iBdmUsiotRSPi85KIfry8cYEn /zFw== X-Gm-Message-State: AOAM532g6IVQs3r+7vRuIB7BNCyQn8ksgTrUNF7jY6XXlboH5EZVZBUo vV0utL7QfYpaxnjp09o7BrP/Lg== X-Google-Smtp-Source: ABdhPJyCAH8re0IigGzSFNGR2JczHDSMi2OtGun5chATn44bOTjCNF+y6MdQtoVSvQQjUFn5n9PlOw== X-Received: by 2002:adf:cd0c:: with SMTP id w12mr3356211wrm.305.1603270624818; Wed, 21 Oct 2020 01:57:04 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id q8sm2675939wro.32.2020.10.21.01.57.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2020 01:57:04 -0700 (PDT) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Vetter , Daniel Vetter , Jason Gunthorpe , Inki Dae , Joonyoung Shim , Seung-Woo Kim , Kyungmin Park , Kukjin Kim , Krzysztof Kozlowski , Andrew Morton , John Hubbard , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Dan Williams , Daniel Vetter Subject: [PATCH v3 02/16] drm/exynos: Use FOLL_LONGTERM for g2d cmdlists Date: Wed, 21 Oct 2020 10:56:41 +0200 Message-Id: <20201021085655.1192025-3-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> References: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: The exynos g2d interface is very unusual, but it looks like the userptr objects are persistent. Hence they need FOLL_LONGTERM. Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Inki Dae Cc: Joonyoung Shim Cc: Seung-Woo Kim Cc: Kyungmin Park Cc: Kukjin Kim Cc: Krzysztof Kozlowski Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Signed-off-by: Daniel Vetter --- drivers/gpu/drm/exynos/exynos_drm_g2d.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c index ecede41af9b9..1e0c5a7f206e 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c +++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c @@ -475,7 +475,8 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct g2d_data *g2d, goto err_free; } - ret = pin_user_pages_fast(start, npages, FOLL_FORCE | FOLL_WRITE, + ret = pin_user_pages_fast(start, npages, + FOLL_FORCE | FOLL_WRITE | FOLL_LONGTERM, g2d_userptr->pages); if (ret != npages) { DRM_DEV_ERROR(g2d->dev, From patchwork Wed Oct 21 08:56:42 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11848607 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 68C9514B4 for ; Wed, 21 Oct 2020 08:57:13 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 09DBD22249 for ; Wed, 21 Oct 2020 08:57:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="doNk6eua" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 09DBD22249 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id DF2D46B006C; Wed, 21 Oct 2020 04:57:08 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id DCC226B006E; Wed, 21 Oct 2020 04:57:08 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B83616B0070; Wed, 21 Oct 2020 04:57:08 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0105.hostedemail.com [216.40.44.105]) by kanga.kvack.org (Postfix) with ESMTP id 882E36B006C for ; Wed, 21 Oct 2020 04:57:08 -0400 (EDT) Received: from smtpin03.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 248D8181AC9CC for ; Wed, 21 Oct 2020 08:57:08 +0000 (UTC) X-FDA: 77395328136.03.blood82_5402daf27247 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin03.hostedemail.com (Postfix) with ESMTP id EF25328A4E8 for ; Wed, 21 Oct 2020 08:57:07 +0000 (UTC) X-Spam-Summary: 1,0,0,942ab9b7f6bdf50b,d41d8cd98f00b204,daniel.vetter@ffwll.ch,,RULES_HIT:2:41:69:152:355:379:541:800:960:966:968:973:981:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1535:1593:1594:1605:1606:1730:1747:1777:1792:2194:2196:2199:2200:2393:2553:2559:2562:2892:2895:3138:3139:3140:3141:3142:3865:3866:3867:3870:3872:3874:4120:4250:4321:4385:4605:5007:6119:6261:6653:6742:6743:7514:7875:7903:8603:9010:9592:10004:11026:11233:11473:11657:11658:11914:12043:12296:12297:12438:12517:12519:12555:12895:12986:13846:13894:14394:14659:21080:21444:21451:21627:21740:21795:21990:30051:30054:30064:30070:30075:30090,0,RBL:209.85.221.66:@ffwll.ch:.lbl8.mailshell.net-62.8.0.100 66.201.201.201;04yg1uwx3sgj9e5jut58na171t7anypqkhi95nhwgi354yd356onz77gehwohxa.yfcaxi8ewnax7xibafk1zy6pk5uqzupzgpmp3tyezdi4iqo8tn4rcfxphd3qi8i.1-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:none,Custom_rul es:0:0:0 X-HE-Tag: blood82_5402daf27247 X-Filterd-Recvd-Size: 9140 Received: from mail-wr1-f66.google.com (mail-wr1-f66.google.com [209.85.221.66]) by imf36.hostedemail.com (Postfix) with ESMTP for ; Wed, 21 Oct 2020 08:57:07 +0000 (UTC) Received: by mail-wr1-f66.google.com with SMTP id s9so2074472wro.8 for ; Wed, 21 Oct 2020 01:57:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=9MYmNhbt3IBp9IaK37PNTjyOhctCnGO+Nfhco8vEF7M=; b=doNk6euaH1pDj5oKj/tCZeznnIG72JlxmwCK9WAwwe98RfwWraLRZlyArC8YSmPmsq 2u8k/P0md5GR5e+ei3+MPc95/O2bCBRmCJuK7lSEIfdk5f9om8kUE3GzFri5+Vor8e/F lbHi/mPrj20QqjpZU6+XQEsIoex6kKFLN47JQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=9MYmNhbt3IBp9IaK37PNTjyOhctCnGO+Nfhco8vEF7M=; b=eyW5fuzMrvlAnPCI0dLM98iy+MTP4klgErW6HQ3wk+ofEXvN3dEX5E3qbAGMXHmhDK rVn6UL4762hCpqLRxiKCNzePvfE89p+k2p6q8UGO9MkgXpD8XOLmfwnvI52J125oIfa/ W2HYFzCMK2+m+NSir04mIWJEEkzuoV9HCtm2lT1sKsWkhIJdNmMCmWsQnIokKS4awC8h B1E1AZAbJRRZ4yocijde36vvgnXpgCl6zLRjEFIZXNQ+eShcVzfq3h/h8OOQo+DmA3L0 CkyhoMbDh1LFOVmIkn8c9hLwL8ewhLsQRBGwUxXRZgRxJ5GoS57ERxpbLGtKSO1pf5bI 3kWg== X-Gm-Message-State: AOAM531jOyn2CE6cm3lIXHJHJ1iVDySHT+JZVvC4bxfpFM87M++MCqnn 8RPErj2XJLklnzXYfTn4M6D3dg== X-Google-Smtp-Source: ABdhPJwxLS0gNPKjRbXiOzYHkVjy2DA00/xSOBlNu4o31orSsWY6PUJlGINRFSFuDe0k26wII5V8aw== X-Received: by 2002:a5d:69ce:: with SMTP id s14mr3682934wrw.39.1603270626448; Wed, 21 Oct 2020 01:57:06 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id q8sm2675939wro.32.2020.10.21.01.57.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2020 01:57:05 -0700 (PDT) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Vetter , John Hubbard , Daniel Vetter , Jason Gunthorpe , Andrew Morton , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Dan Williams , Oded Gabbay , Omer Shpigelman , Ofir Bitton , Tomer Tayar , Moti Haimovski , Greg Kroah-Hartman , Pawel Piskorski , Daniel Vetter Subject: [PATCH v3 03/16] misc/habana: Stop using frame_vector helpers Date: Wed, 21 Oct 2020 10:56:42 +0200 Message-Id: <20201021085655.1192025-4-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> References: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: All we need are a pages array, pin_user_pages_fast can give us that directly. Plus this avoids the entire raw pfn side of get_vaddr_frames. Reviewed-by: John Hubbard Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: Oded Gabbay Cc: Omer Shpigelman Cc: Ofir Bitton Cc: Tomer Tayar Cc: Moti Haimovski Cc: Daniel Vetter Cc: Greg Kroah-Hartman Cc: Pawel Piskorski Signed-off-by: Daniel Vetter --- v2: Use unpin_user_pages_dirty_lock (John) v3: Update kerneldoc (Oded) --- drivers/misc/habanalabs/Kconfig | 1 - drivers/misc/habanalabs/common/habanalabs.h | 6 ++- drivers/misc/habanalabs/common/memory.c | 49 ++++++++------------- 3 files changed, 22 insertions(+), 34 deletions(-) diff --git a/drivers/misc/habanalabs/Kconfig b/drivers/misc/habanalabs/Kconfig index 8eb5d38c618e..2f04187f7167 100644 --- a/drivers/misc/habanalabs/Kconfig +++ b/drivers/misc/habanalabs/Kconfig @@ -6,7 +6,6 @@ config HABANA_AI tristate "HabanaAI accelerators (habanalabs)" depends on PCI && HAS_IOMEM - select FRAME_VECTOR select DMA_SHARED_BUFFER select GENERIC_ALLOCATOR select HWMON diff --git a/drivers/misc/habanalabs/common/habanalabs.h b/drivers/misc/habanalabs/common/habanalabs.h index edbd627b29d2..41af090b3e6a 100644 --- a/drivers/misc/habanalabs/common/habanalabs.h +++ b/drivers/misc/habanalabs/common/habanalabs.h @@ -870,7 +870,8 @@ struct hl_ctx_mgr { * struct hl_userptr - memory mapping chunk information * @vm_type: type of the VM. * @job_node: linked-list node for hanging the object on the Job's list. - * @vec: pointer to the frame vector. + * @pages: pointer to struct page array + * @npages: size of @pages array * @sgt: pointer to the scatter-gather table that holds the pages. * @dir: for DMA unmapping, the direction must be supplied, so save it. * @debugfs_list: node in debugfs list of command submissions. @@ -881,7 +882,8 @@ struct hl_ctx_mgr { struct hl_userptr { enum vm_type_t vm_type; /* must be first */ struct list_head job_node; - struct frame_vector *vec; + struct page **pages; + unsigned int npages; struct sg_table *sgt; enum dma_data_direction dir; struct list_head debugfs_list; diff --git a/drivers/misc/habanalabs/common/memory.c b/drivers/misc/habanalabs/common/memory.c index 5ff4688683fd..327b64479f97 100644 --- a/drivers/misc/habanalabs/common/memory.c +++ b/drivers/misc/habanalabs/common/memory.c @@ -1281,45 +1281,41 @@ static int get_user_memory(struct hl_device *hdev, u64 addr, u64 size, return -EFAULT; } - userptr->vec = frame_vector_create(npages); - if (!userptr->vec) { + userptr->pages = kvmalloc_array(npages, sizeof(*userptr->pages), + GFP_KERNEL); + if (!userptr->pages) { dev_err(hdev->dev, "Failed to create frame vector\n"); return -ENOMEM; } - rc = get_vaddr_frames(start, npages, FOLL_FORCE | FOLL_WRITE, - userptr->vec); + rc = pin_user_pages_fast(start, npages, FOLL_FORCE | FOLL_WRITE, + userptr->pages); if (rc != npages) { dev_err(hdev->dev, "Failed to map host memory, user ptr probably wrong\n"); if (rc < 0) - goto destroy_framevec; + goto destroy_pages; + npages = rc; rc = -EFAULT; - goto put_framevec; - } - - if (frame_vector_to_pages(userptr->vec) < 0) { - dev_err(hdev->dev, - "Failed to translate frame vector to pages\n"); - rc = -EFAULT; - goto put_framevec; + goto put_pages; } + userptr->npages = npages; rc = sg_alloc_table_from_pages(userptr->sgt, - frame_vector_pages(userptr->vec), - npages, offset, size, GFP_ATOMIC); + userptr->pages, + npages, offset, size, GFP_ATOMIC); if (rc < 0) { dev_err(hdev->dev, "failed to create SG table from pages\n"); - goto put_framevec; + goto put_pages; } return 0; -put_framevec: - put_vaddr_frames(userptr->vec); -destroy_framevec: - frame_vector_destroy(userptr->vec); +put_pages: + unpin_user_pages(userptr->pages, npages); +destroy_pages: + kvfree(userptr->pages); return rc; } @@ -1405,8 +1401,6 @@ int hl_pin_host_memory(struct hl_device *hdev, u64 addr, u64 size, */ void hl_unpin_host_memory(struct hl_device *hdev, struct hl_userptr *userptr) { - struct page **pages; - hl_debugfs_remove_userptr(hdev, userptr); if (userptr->dma_mapped) @@ -1414,15 +1408,8 @@ void hl_unpin_host_memory(struct hl_device *hdev, struct hl_userptr *userptr) userptr->sgt->nents, userptr->dir); - pages = frame_vector_pages(userptr->vec); - if (!IS_ERR(pages)) { - int i; - - for (i = 0; i < frame_vector_count(userptr->vec); i++) - set_page_dirty_lock(pages[i]); - } - put_vaddr_frames(userptr->vec); - frame_vector_destroy(userptr->vec); + unpin_user_pages_dirty_lock(userptr->pages, userptr->npages, true); + kvfree(userptr->pages); list_del(&userptr->job_node); From patchwork Wed Oct 21 08:56:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11848609 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9EA9414B2 for ; Wed, 21 Oct 2020 08:57:15 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 4E7D12237B for ; Wed, 21 Oct 2020 08:57:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="GPnXCMyD" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4E7D12237B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 2F90E6B006E; Wed, 21 Oct 2020 04:57:10 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 2A7DF6B0070; Wed, 21 Oct 2020 04:57:10 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0F9FA6B0071; Wed, 21 Oct 2020 04:57:10 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0234.hostedemail.com [216.40.44.234]) by kanga.kvack.org (Postfix) with ESMTP id D6F606B006E for ; Wed, 21 Oct 2020 04:57:09 -0400 (EDT) Received: from smtpin15.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 7AF9B181AC9CC for ; Wed, 21 Oct 2020 08:57:09 +0000 (UTC) X-FDA: 77395328178.15.dust05_561588027247 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin15.hostedemail.com (Postfix) with ESMTP id 57B501814B0C1 for ; Wed, 21 Oct 2020 08:57:09 +0000 (UTC) X-Spam-Summary: 1,0,0,84abb212113a0512,d41d8cd98f00b204,daniel.vetter@ffwll.ch,,RULES_HIT:41:152:355:379:541:800:960:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1535:1541:1593:1594:1711:1730:1747:1777:1792:2393:2553:2559:2562:3138:3139:3140:3141:3142:3352:3865:3866:4321:5007:6261:6653:6742:6743:7514:8603:10004:10400:11026:11657:11658:11914:12043:12296:12297:12517:12519:12555:12895:12986:13069:13161:13229:13311:13357:13846:13894:14096:14097:14181:14394:14659:14721:21080:21251:21444:21451:21627:21990:30054:30064:30090,0,RBL:209.85.221.66:@ffwll.ch:.lbl8.mailshell.net-62.8.0.100 66.201.201.201;04yg7pd4u3g3p9jrapjc34ftnf61kypjyabm1pa4y4abm39ar6x4yhtyzmszam4.4i6fuecf1bpak4kby9rp15yagffkqfacsm5tfq7ejc84nwr7paw6gpcuo38kzzg.e-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:none,Custom_rules:0:0:0,LFtime:25,LUA_SUMMARY:none X-HE-Tag: dust05_561588027247 X-Filterd-Recvd-Size: 5167 Received: from mail-wr1-f66.google.com (mail-wr1-f66.google.com [209.85.221.66]) by imf03.hostedemail.com (Postfix) with ESMTP for ; Wed, 21 Oct 2020 08:57:08 +0000 (UTC) Received: by mail-wr1-f66.google.com with SMTP id e17so2016232wru.12 for ; Wed, 21 Oct 2020 01:57:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=X91vcdrvFkENyRAE7ngumttfTvuoYERNqnOUmx1loc8=; b=GPnXCMyD+ghMvqTjeYNcG8HYusAwuJxpfHWnTLJKQIsMVr4ZAhrveCWfs4AXdeBUPw Y5mupIyBAV9NDJ8u8gy061IQONEWL5h8a9oYpovitSRm7WeaCy/YPrPbgEp1B6AXN1YC FZ2gAxPTsOCGgSfQP+HaV8u3GtfeNX/N9iPJ8= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=X91vcdrvFkENyRAE7ngumttfTvuoYERNqnOUmx1loc8=; b=YcHjVytVMcl79xcIgoH78IIXpY/KP8RetMZJJ+ZLuj132xCq77VLjZpGqfAof61Nmx 8TaUzpEOAhs+ravyWc3LrMhZoZBT+qHwHDzaKGb9c8k2O4jDn1Fy9LZAx0KMViCKXPQ1 mjK/PyDDVSDeJWT9MelhgsTjbZFpoI2lcgzHwXLHGK6N2LL8t8bG7Hs7pftZOY1ZBEkO 1TPKYzytpuTjWU9nqQXwO+OZ4d5kVn2TOdQdQHRIUIh9NnYqf4aHLTTSOwPBLkcxWmTx la/MChw7efqNOIZfhQnzRIId76o9Ve7s6UT5Z2S2wUz60CybF4FZy56mU4mAUle6K22t sApg== X-Gm-Message-State: AOAM533QaJiGGIdaJmyTTRKjXTi9JdBrO9+RtokvhcbIvff5H/ozw0v6 lwUum9OkCLdvTSs9EbKagvUn+A== X-Google-Smtp-Source: ABdhPJwRJSi1MhjUwKHGSaK47xh7Klwun5uHdPZbkNE0DXk17iEFA5dRgyjIq8Do+yUzr74H0TKxFQ== X-Received: by 2002:a5d:554b:: with SMTP id g11mr3494901wrw.370.1603270627906; Wed, 21 Oct 2020 01:57:07 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id q8sm2675939wro.32.2020.10.21.01.57.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2020 01:57:07 -0700 (PDT) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Vetter , Daniel Vetter , Jason Gunthorpe , Andrew Morton , John Hubbard , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Dan Williams , Oded Gabbay , Omer Shpigelman , Ofir Bitton , Tomer Tayar , Moti Haimovski , Greg Kroah-Hartman , Pawel Piskorski , Daniel Vetter Subject: [PATCH v3 04/16] misc/habana: Use FOLL_LONGTERM for userptr Date: Wed, 21 Oct 2020 10:56:43 +0200 Message-Id: <20201021085655.1192025-5-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> References: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: These are persistent, not just for the duration of a dma operation. Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: Oded Gabbay Cc: Omer Shpigelman Cc: Ofir Bitton Cc: Tomer Tayar Cc: Moti Haimovski Cc: Daniel Vetter Cc: Greg Kroah-Hartman Cc: Pawel Piskorski Signed-off-by: Daniel Vetter --- drivers/misc/habanalabs/common/memory.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/misc/habanalabs/common/memory.c b/drivers/misc/habanalabs/common/memory.c index 327b64479f97..767d3644c033 100644 --- a/drivers/misc/habanalabs/common/memory.c +++ b/drivers/misc/habanalabs/common/memory.c @@ -1288,7 +1288,8 @@ static int get_user_memory(struct hl_device *hdev, u64 addr, u64 size, return -ENOMEM; } - rc = pin_user_pages_fast(start, npages, FOLL_FORCE | FOLL_WRITE, + rc = pin_user_pages_fast(start, npages, + FOLL_FORCE | FOLL_WRITE | FOLL_LONGTERM, userptr->pages); if (rc != npages) { From patchwork Wed Oct 21 08:56:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11848615 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id F122D14B4 for ; Wed, 21 Oct 2020 08:57:17 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 91FE622251 for ; Wed, 21 Oct 2020 08:57:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="LHFf1nOp" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 91FE622251 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id F2D0D6B0070; Wed, 21 Oct 2020 04:57:11 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id EDC706B0071; Wed, 21 Oct 2020 04:57:11 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CBC126B0072; Wed, 21 Oct 2020 04:57:11 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0053.hostedemail.com [216.40.44.53]) by kanga.kvack.org (Postfix) with ESMTP id 9D2316B0070 for ; Wed, 21 Oct 2020 04:57:11 -0400 (EDT) Received: from smtpin04.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 31B3282D0306 for ; Wed, 21 Oct 2020 08:57:11 +0000 (UTC) X-FDA: 77395328262.04.shame79_400cc2427247 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin04.hostedemail.com (Postfix) with ESMTP id 101AE80061F6 for ; Wed, 21 Oct 2020 08:57:11 +0000 (UTC) X-Spam-Summary: 1,0,0,294c6814396dca85,d41d8cd98f00b204,daniel.vetter@ffwll.ch,,RULES_HIT:41:69:152:355:379:541:800:960:966:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1535:1543:1593:1594:1711:1730:1747:1777:1792:2196:2199:2393:2553:2559:2562:3138:3139:3140:3141:3142:3355:3865:3866:3867:3868:3870:3871:3872:4118:4250:4321:4385:5007:6261:6653:6742:7903:9592:10004:10400:11026:11658:11914:12043:12294:12296:12297:12438:12517:12519:12555:12683:12895:12986:13846:13894:14181:14394:14659:14721:21080:21251:21324:21444:21451:21627:21740:21990:30012:30054:30064:30090,0,RBL:209.85.221.68:@ffwll.ch:.lbl8.mailshell.net-62.8.0.100 66.201.201.201;04y8akz9q8kgokorzz1y17uzwf9huypayq4q5uj4xos4z58cy4b5a19xzaau59p.esiui85oo8xshohogknh8qxome4kyy68ggyw9fcefx4gyd4hfpnhw199atydhsb.y-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:none,Custom_rules:0:0:0,LFtime:25,LUA_SUMMARY:none X-HE-Tag: shame79_400cc2427247 X-Filterd-Recvd-Size: 7361 Received: from mail-wr1-f68.google.com (mail-wr1-f68.google.com [209.85.221.68]) by imf44.hostedemail.com (Postfix) with ESMTP for ; Wed, 21 Oct 2020 08:57:10 +0000 (UTC) Received: by mail-wr1-f68.google.com with SMTP id g12so2036585wrp.10 for ; Wed, 21 Oct 2020 01:57:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=OPi94I7u5TlT9ZMkfo3wd9G1XVf17ZOM76y2ie/UBYo=; b=LHFf1nOpd9Yl+wPGLpl23bEIb0QE+8Hot8HPPyfFC6dPlkHm+Dy5yniNcp8HX0A/zw lIEYHsUhRbf34d1PqRehF0XEoT/gzswXJzS/vHVbL/EyCnNOruKM6IjOpvFvTkma3oc3 x6t5IzbtOyzSuC7eyTfotP+gLU4tsrzFecuWM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=OPi94I7u5TlT9ZMkfo3wd9G1XVf17ZOM76y2ie/UBYo=; b=slMTq1ujRzvIqT8KjyH861Mh67aenyuN4xhYJvELqvsyuuGjSV4JWV8YSFzNgNC/jC cC5nYyYfYp2Fejweqguly+ptOGGOBEqHz0LVJT3loNs8k5mKCJS6whODskVsUmqsSo1Y h7HkgR48KjUM3CDxgI7yoQyS+Jj+kJoNArK5fx60/ILO2nDBXy+k+ZRDujKR69COsfvM SBCIkcm+E342caJH323N1dV5mSZbOSZz2haQgp4KsIYYTFKkpmG5mo+nl8+KePRfTojW pxWPwschwDecSUuSyulrsyrHM5e53UfdJWt7+Go+xe4b5Cj1eAURCf4Ouzlnnxbc0iKV eGGw== X-Gm-Message-State: AOAM530qADHFg4UaCYKp2g/pzZPh0ULJ8yq1o2AhJCMomDtl1Su2XO1X dIN4JCq9CzbYux1lxz3cPrzFhQ== X-Google-Smtp-Source: ABdhPJw9zQlQYxuU/CNLju53SaBbNIHKJyF+jiQvqzMWRBPWLPGowYaSPULBChwBYVyW5+HEPgaJwA== X-Received: by 2002:adf:cd87:: with SMTP id q7mr3373418wrj.169.1603270629486; Wed, 21 Oct 2020 01:57:09 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id q8sm2675939wro.32.2020.10.21.01.57.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2020 01:57:08 -0700 (PDT) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Vetter , Daniel Vetter , Jason Gunthorpe , Pawel Osciak , Marek Szyprowski , Kyungmin Park , Tomasz Figa , Mauro Carvalho Chehab , Andrew Morton , John Hubbard , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Dan Williams , Daniel Vetter Subject: [PATCH v3 05/16] mm/frame-vector: Use FOLL_LONGTERM Date: Wed, 21 Oct 2020 10:56:44 +0200 Message-Id: <20201021085655.1192025-6-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> References: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: This is used by media/videbuf2 for persistent dma mappings, not just for a single dma operation and then freed again, so needs FOLL_LONGTERM. Unfortunately current pup_locked doesn't support FOLL_LONGTERM due to locking issues. Rework the code to pull the pup path out from the mmap_sem critical section as suggested by Jason. By relying entirely on the vma checks in pin_user_pages and follow_pfn (for vm_flags and vma_is_fsdax) we can also streamline the code a lot. Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Pawel Osciak Cc: Marek Szyprowski Cc: Kyungmin Park Cc: Tomasz Figa Cc: Mauro Carvalho Chehab Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Signed-off-by: Daniel Vetter --- v2: Streamline the code and further simplify the loop checks (Jason) --- mm/frame_vector.c | 50 ++++++++++++++--------------------------------- 1 file changed, 15 insertions(+), 35 deletions(-) diff --git a/mm/frame_vector.c b/mm/frame_vector.c index 10f82d5643b6..d44779e56313 100644 --- a/mm/frame_vector.c +++ b/mm/frame_vector.c @@ -38,7 +38,6 @@ int get_vaddr_frames(unsigned long start, unsigned int nr_frames, struct vm_area_struct *vma; int ret = 0; int err; - int locked; if (nr_frames == 0) return 0; @@ -48,40 +47,25 @@ int get_vaddr_frames(unsigned long start, unsigned int nr_frames, start = untagged_addr(start); - mmap_read_lock(mm); - locked = 1; - vma = find_vma_intersection(mm, start, start + 1); - if (!vma) { - ret = -EFAULT; - goto out; - } - - /* - * While get_vaddr_frames() could be used for transient (kernel - * controlled lifetime) pinning of memory pages all current - * users establish long term (userspace controlled lifetime) - * page pinning. Treat get_vaddr_frames() like - * get_user_pages_longterm() and disallow it for filesystem-dax - * mappings. - */ - if (vma_is_fsdax(vma)) { - ret = -EOPNOTSUPP; - goto out; - } - - if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) { + ret = pin_user_pages_fast(start, nr_frames, + FOLL_FORCE | FOLL_WRITE | FOLL_LONGTERM, + (struct page **)(vec->ptrs)); + if (ret > 0) { vec->got_ref = true; vec->is_pfns = false; - ret = pin_user_pages_locked(start, nr_frames, - gup_flags, (struct page **)(vec->ptrs), &locked); - goto out; + goto out_unlocked; } + mmap_read_lock(mm); vec->got_ref = false; vec->is_pfns = true; do { unsigned long *nums = frame_vector_pfns(vec); + vma = find_vma_intersection(mm, start, start + 1); + if (!vma) + break; + while (ret < nr_frames && start + PAGE_SIZE <= vma->vm_end) { err = follow_pfn(vma, start, &nums[ret]); if (err) { @@ -92,17 +76,13 @@ int get_vaddr_frames(unsigned long start, unsigned int nr_frames, start += PAGE_SIZE; ret++; } - /* - * We stop if we have enough pages or if VMA doesn't completely - * cover the tail page. - */ - if (ret >= nr_frames || start < vma->vm_end) + /* Bail out if VMA doesn't completely cover the tail page. */ + if (start < vma->vm_end) break; - vma = find_vma_intersection(mm, start, start + 1); - } while (vma && vma->vm_flags & (VM_IO | VM_PFNMAP)); + } while (ret < nr_frames); out: - if (locked) - mmap_read_unlock(mm); + mmap_read_unlock(mm); +out_unlocked: if (!ret) ret = -EFAULT; if (ret > 0) From patchwork Wed Oct 21 08:56:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11848619 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id EE68B14B4 for ; Wed, 21 Oct 2020 08:57:19 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 95D0C22483 for ; Wed, 21 Oct 2020 08:57:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="AdOnfVRX" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 95D0C22483 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 8EE556B0071; Wed, 21 Oct 2020 04:57:13 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 8C2066B0072; Wed, 21 Oct 2020 04:57:13 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 790436B0073; Wed, 21 Oct 2020 04:57:13 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0210.hostedemail.com [216.40.44.210]) by kanga.kvack.org (Postfix) with ESMTP id 42DBE6B0071 for ; Wed, 21 Oct 2020 04:57:13 -0400 (EDT) Received: from smtpin21.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id CD8264DA6 for ; Wed, 21 Oct 2020 08:57:12 +0000 (UTC) X-FDA: 77395328304.21.bird83_55017a227247 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin21.hostedemail.com (Postfix) with ESMTP id A3687180442C0 for ; Wed, 21 Oct 2020 08:57:12 +0000 (UTC) X-Spam-Summary: 1,0,0,7330a15d46478c0e,d41d8cd98f00b204,daniel.vetter@ffwll.ch,,RULES_HIT:1:2:41:69:152:334:355:368:369:379:541:800:960:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1593:1594:1605:1730:1747:1777:1792:1801:2393:2553:2559:2562:2901:3138:3139:3140:3141:3142:3280:3865:3866:3867:3870:3871:3872:3873:3874:4051:4321:4605:5007:6117:6261:6609:6653:6742:6743:7875:7903:9592:10004:11026:11232:11473:11657:11658:11914:12043:12296:12297:12438:12517:12519:12555:12895:12986:13846:13894:14096:14097:14394:14659:21080:21092:21444:21450:21451:21627:21773:21795:21990:30003:30034:30051:30054:30064:30089:30090,0,RBL:209.85.221.66:@ffwll.ch:.lbl8.mailshell.net-66.201.201.201 62.8.0.100;04yfx394e6dzjm5fegjeo3gksuk16ocp7c44ut3cspe3r1pnndpimh9dc6k8ujw.e5jk4bxg3h731c9ji5pyg539r4fwwntnwgh867iaht8wxn9wsr8b7nb6hjq8st7.q-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:none,Custom_rules: 0:0:0,LF X-HE-Tag: bird83_55017a227247 X-Filterd-Recvd-Size: 12197 Received: from mail-wr1-f66.google.com (mail-wr1-f66.google.com [209.85.221.66]) by imf18.hostedemail.com (Postfix) with ESMTP for ; Wed, 21 Oct 2020 08:57:12 +0000 (UTC) Received: by mail-wr1-f66.google.com with SMTP id s9so2074820wro.8 for ; Wed, 21 Oct 2020 01:57:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=xzdyc8sih5Z0jRADJV+ltVfvf6iEsLGUY40vg3gKdy4=; b=AdOnfVRXK2jLUkWeysMwr5VnelegOvEuD42g4XQQ2o/HPbn3B45hScTlZrU405LEZA /qgjz5i8D8WVC1BcUTGzrvj8J4olZ0cF/bn8uhrLNQKtgTOmzfug6laU3iQ56ZvGPvEs d+u58HgNbzHUsZ31LXvTAwUzbDKivlYNkdGy0= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=xzdyc8sih5Z0jRADJV+ltVfvf6iEsLGUY40vg3gKdy4=; b=ZJkGWlG7anbUaAdP9hX4WDVBeuHnC1jf4aNYMDW5PZ8ycerSHj5p6Qj3XR9aiK3aYT UV0eksVRou4kgZWbs1NoRavPeEMF3JRgJy6thH15YYK32SQq+dT70VxIrx9LdFvvAC0C /fqlwXlj9P3H1hzbIEJ3LUhmQWepEQAJVvdRCMFID8ih3g8Q6ltp1ldsKBLAP8LP7TuF QgkpKy1p+DWL3xTJdqc6J7Ztu39R/LhbkEhX8qLc4fm0hE4wkhlyN9AOTDCEHrmbdXrq 7CkwzXLuUVjN1Gwx7ycSTiYPp5AprVHhhZiqhde+WX5kzNKSE7fy8OrXxW6X3G2fapHp zZmQ== X-Gm-Message-State: AOAM533LzbnuE/fJw9ZUCOA4y10dks4PoFYQsJQ+wDn7tlljloOpkhR9 Xplit6gD3kvLAQA3GpDrpIRbPg== X-Google-Smtp-Source: ABdhPJymCRzh/+xt/XeM4YX4g2ysALHdYKVSmfzFvh99kus6TTSD1sMWyRHhXQaDGTzJS3PH3CShCw== X-Received: by 2002:adf:cd0c:: with SMTP id w12mr3356719wrm.305.1603270631122; Wed, 21 Oct 2020 01:57:11 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id q8sm2675939wro.32.2020.10.21.01.57.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2020 01:57:10 -0700 (PDT) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Vetter , John Hubbard , Mauro Carvalho Chehab , Daniel Vetter , Jason Gunthorpe , Pawel Osciak , Marek Szyprowski , Kyungmin Park , Tomasz Figa , Mauro Carvalho Chehab , Andrew Morton , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Dan Williams , Daniel Vetter Subject: [PATCH v3 06/16] media: videobuf2: Move frame_vector into media subsystem Date: Wed, 21 Oct 2020 10:56:45 +0200 Message-Id: <20201021085655.1192025-7-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> References: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: It's the only user. This also garbage collects the CONFIG_FRAME_VECTOR symbol from all over the tree (well just one place, somehow omap media driver still had this in its Kconfig, despite not using it). Reviewed-by: John Hubbard Acked-by: Mauro Carvalho Chehab Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Pawel Osciak Cc: Marek Szyprowski Cc: Kyungmin Park Cc: Tomasz Figa Cc: Mauro Carvalho Chehab Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: Daniel Vetter Signed-off-by: Daniel Vetter --- v3: - Create a new frame_vector.h header for this (Mauro) --- drivers/media/common/videobuf2/Kconfig | 1 - drivers/media/common/videobuf2/Makefile | 1 + .../media/common/videobuf2}/frame_vector.c | 2 + drivers/media/platform/omap/Kconfig | 1 - include/linux/mm.h | 42 ----------------- include/media/frame_vector.h | 47 +++++++++++++++++++ include/media/videobuf2-core.h | 1 + mm/Kconfig | 3 -- mm/Makefile | 1 - 9 files changed, 51 insertions(+), 48 deletions(-) rename {mm => drivers/media/common/videobuf2}/frame_vector.c (99%) create mode 100644 include/media/frame_vector.h diff --git a/drivers/media/common/videobuf2/Kconfig b/drivers/media/common/videobuf2/Kconfig index edbc99ebba87..d2223a12c95f 100644 --- a/drivers/media/common/videobuf2/Kconfig +++ b/drivers/media/common/videobuf2/Kconfig @@ -9,7 +9,6 @@ config VIDEOBUF2_V4L2 config VIDEOBUF2_MEMOPS tristate - select FRAME_VECTOR config VIDEOBUF2_DMA_CONTIG tristate diff --git a/drivers/media/common/videobuf2/Makefile b/drivers/media/common/videobuf2/Makefile index 77bebe8b202f..54306f8d096c 100644 --- a/drivers/media/common/videobuf2/Makefile +++ b/drivers/media/common/videobuf2/Makefile @@ -1,5 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 videobuf2-common-objs := videobuf2-core.o +videobuf2-common-objs += frame_vector.o ifeq ($(CONFIG_TRACEPOINTS),y) videobuf2-common-objs += vb2-trace.o diff --git a/mm/frame_vector.c b/drivers/media/common/videobuf2/frame_vector.c similarity index 99% rename from mm/frame_vector.c rename to drivers/media/common/videobuf2/frame_vector.c index d44779e56313..6590987c14bd 100644 --- a/mm/frame_vector.c +++ b/drivers/media/common/videobuf2/frame_vector.c @@ -8,6 +8,8 @@ #include #include +#include + /** * get_vaddr_frames() - map virtual addresses to pfns * @start: starting user address diff --git a/drivers/media/platform/omap/Kconfig b/drivers/media/platform/omap/Kconfig index f73b5893220d..de16de46c0f4 100644 --- a/drivers/media/platform/omap/Kconfig +++ b/drivers/media/platform/omap/Kconfig @@ -12,6 +12,5 @@ config VIDEO_OMAP2_VOUT depends on VIDEO_V4L2 select VIDEOBUF2_DMA_CONTIG select OMAP2_VRFB if ARCH_OMAP2 || ARCH_OMAP3 - select FRAME_VECTOR help V4L2 Display driver support for OMAP2/3 based boards. diff --git a/include/linux/mm.h b/include/linux/mm.h index 16b799a0522c..acd60fbf1a5a 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1743,48 +1743,6 @@ int account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc); int __account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc, struct task_struct *task, bool bypass_rlim); -/* Container for pinned pfns / pages */ -struct frame_vector { - unsigned int nr_allocated; /* Number of frames we have space for */ - unsigned int nr_frames; /* Number of frames stored in ptrs array */ - bool got_ref; /* Did we pin pages by getting page ref? */ - bool is_pfns; /* Does array contain pages or pfns? */ - void *ptrs[]; /* Array of pinned pfns / pages. Use - * pfns_vector_pages() or pfns_vector_pfns() - * for access */ -}; - -struct frame_vector *frame_vector_create(unsigned int nr_frames); -void frame_vector_destroy(struct frame_vector *vec); -int get_vaddr_frames(unsigned long start, unsigned int nr_pfns, - unsigned int gup_flags, struct frame_vector *vec); -void put_vaddr_frames(struct frame_vector *vec); -int frame_vector_to_pages(struct frame_vector *vec); -void frame_vector_to_pfns(struct frame_vector *vec); - -static inline unsigned int frame_vector_count(struct frame_vector *vec) -{ - return vec->nr_frames; -} - -static inline struct page **frame_vector_pages(struct frame_vector *vec) -{ - if (vec->is_pfns) { - int err = frame_vector_to_pages(vec); - - if (err) - return ERR_PTR(err); - } - return (struct page **)(vec->ptrs); -} - -static inline unsigned long *frame_vector_pfns(struct frame_vector *vec) -{ - if (!vec->is_pfns) - frame_vector_to_pfns(vec); - return (unsigned long *)(vec->ptrs); -} - struct kvec; int get_kernel_pages(const struct kvec *iov, int nr_pages, int write, struct page **pages); diff --git a/include/media/frame_vector.h b/include/media/frame_vector.h new file mode 100644 index 000000000000..1ed0cd64510d --- /dev/null +++ b/include/media/frame_vector.h @@ -0,0 +1,47 @@ +// SPDX-License-Identifier: GPL-2.0 +#ifndef _MEDIA_FRAME_VECTOR_H +#define _MEDIA_FRAME_VECTOR_H + +/* Container for pinned pfns / pages in frame_vector.c */ +struct frame_vector { + unsigned int nr_allocated; /* Number of frames we have space for */ + unsigned int nr_frames; /* Number of frames stored in ptrs array */ + bool got_ref; /* Did we pin pages by getting page ref? */ + bool is_pfns; /* Does array contain pages or pfns? */ + void *ptrs[]; /* Array of pinned pfns / pages. Use + * pfns_vector_pages() or pfns_vector_pfns() + * for access */ +}; + +struct frame_vector *frame_vector_create(unsigned int nr_frames); +void frame_vector_destroy(struct frame_vector *vec); +int get_vaddr_frames(unsigned long start, unsigned int nr_pfns, + unsigned int gup_flags, struct frame_vector *vec); +void put_vaddr_frames(struct frame_vector *vec); +int frame_vector_to_pages(struct frame_vector *vec); +void frame_vector_to_pfns(struct frame_vector *vec); + +static inline unsigned int frame_vector_count(struct frame_vector *vec) +{ + return vec->nr_frames; +} + +static inline struct page **frame_vector_pages(struct frame_vector *vec) +{ + if (vec->is_pfns) { + int err = frame_vector_to_pages(vec); + + if (err) + return ERR_PTR(err); + } + return (struct page **)(vec->ptrs); +} + +static inline unsigned long *frame_vector_pfns(struct frame_vector *vec) +{ + if (!vec->is_pfns) + frame_vector_to_pfns(vec); + return (unsigned long *)(vec->ptrs); +} + +#endif /* _MEDIA_FRAME_VECTOR_H */ diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h index bbb3f26fbde9..d045e3a5a1d8 100644 --- a/include/media/videobuf2-core.h +++ b/include/media/videobuf2-core.h @@ -18,6 +18,7 @@ #include #include #include +#include #define VB2_MAX_FRAME (32) #define VB2_MAX_PLANES (8) diff --git a/mm/Kconfig b/mm/Kconfig index 6c974888f86f..da6c943fe9f1 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -815,9 +815,6 @@ config DEVICE_PRIVATE memory; i.e., memory that is only accessible from the device (or group of devices). You likely also want to select HMM_MIRROR. -config FRAME_VECTOR - bool - config ARCH_USES_HIGH_VMA_FLAGS bool config ARCH_HAS_PKEYS diff --git a/mm/Makefile b/mm/Makefile index d5649f1c12c0..a025fd6c6afd 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -111,7 +111,6 @@ obj-$(CONFIG_PAGE_EXTENSION) += page_ext.o obj-$(CONFIG_CMA_DEBUGFS) += cma_debug.o obj-$(CONFIG_USERFAULTFD) += userfaultfd.o obj-$(CONFIG_IDLE_PAGE_TRACKING) += page_idle.o -obj-$(CONFIG_FRAME_VECTOR) += frame_vector.o obj-$(CONFIG_DEBUG_PAGE_REF) += debug_page_ref.o obj-$(CONFIG_HARDENED_USERCOPY) += usercopy.o obj-$(CONFIG_PERCPU_STATS) += percpu-stats.o From patchwork Wed Oct 21 08:56:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11848621 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4BBF214B2 for ; Wed, 21 Oct 2020 08:57:22 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id EA5CC223C6 for ; Wed, 21 Oct 2020 08:57:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="UPG0GcaS" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EA5CC223C6 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 2318B6B0072; Wed, 21 Oct 2020 04:57:15 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 1E85E6B0073; Wed, 21 Oct 2020 04:57:15 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id F04136B0074; Wed, 21 Oct 2020 04:57:14 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0169.hostedemail.com [216.40.44.169]) by kanga.kvack.org (Postfix) with ESMTP id C52B26B0072 for ; Wed, 21 Oct 2020 04:57:14 -0400 (EDT) Received: from smtpin17.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 611BE827CB91 for ; Wed, 21 Oct 2020 08:57:14 +0000 (UTC) X-FDA: 77395328388.17.knife99_010cff327247 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin17.hostedemail.com (Postfix) with ESMTP id 458AE180D0180 for ; Wed, 21 Oct 2020 08:57:14 +0000 (UTC) X-Spam-Summary: 1,0,0,b5b2137f293c078c,d41d8cd98f00b204,daniel.vetter@ffwll.ch,,RULES_HIT:41:152:355:379:541:800:960:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1535:1544:1593:1594:1605:1711:1730:1747:1777:1792:1981:2194:2198:2199:2200:2393:2553:2559:2562:2901:3138:3139:3140:3141:3142:3865:3866:3867:3868:3870:3871:3872:3874:4119:4321:4605:5007:6117:6119:6261:6653:6742:7875:7903:7974:10004:11026:11473:11658:11914:12043:12050:12291:12296:12297:12438:12517:12519:12555:12679:12683:12895:13161:13229:13846:13894:14096:14097:14181:14394:14659:14721:21080:21444:21451:21627:21990:30002:30054:30064:30070:30090,0,RBL:209.85.221.65:@ffwll.ch:.lbl8.mailshell.net-66.201.201.201 62.8.0.100;04yftgkg3whuayw5hrbhqrapgjes8ocef5tchd9qp9i36ipe963xq5bh31pkm84.nu5kz8fcx5wn7rhbfixoqrffse16cc1ncacjr1gbx6qq1bxtby667t5yhftomps.y-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:none,Custom_rules: 0:0:0,LF X-HE-Tag: knife99_010cff327247 X-Filterd-Recvd-Size: 8131 Received: from mail-wr1-f65.google.com (mail-wr1-f65.google.com [209.85.221.65]) by imf20.hostedemail.com (Postfix) with ESMTP for ; Wed, 21 Oct 2020 08:57:13 +0000 (UTC) Received: by mail-wr1-f65.google.com with SMTP id h7so2130830wre.4 for ; Wed, 21 Oct 2020 01:57:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=hPBU4fd0tsYMcwp3ePz/Ho5qxuZVtGOvHiVJ9lQm7jY=; b=UPG0GcaSTYJzjNnzuql1oJmuf2ORiGcXQtqBG64S8CJ+9ZNvyS7CG072HrAMR+73AB jB8MJNaRilWsUd4vS9zDKwBxbBP/BpyY0v72COGfai/Je6t+7CKMe5spgkDoEsWn64wK NHlOVjp/UNJrgmhaKbuEgaJ1CW341WCoy+fng= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=hPBU4fd0tsYMcwp3ePz/Ho5qxuZVtGOvHiVJ9lQm7jY=; b=Un2Lb9uwWiHlgGV9O3U1v64sjIPUGRT8d3iAbfM3u7VMfK9kIvowd//Ntyx5F+1AjC 14N4q8WL86lJWCvmXct4AQE/u9MPMxBTzGq96FP4tBHZactTy+aeUwqPWuxfjxSeDEo9 pAkyn9vdH3AHxC+qn0Gm4YYc5SZTY5b/gNfAE3ZXOmBr8mRdJ1oNllOZ2bnsd7Hg5w7L /nDg5fFuvXHirgtMxXWNF7VYnKZVtz6YXa5f73085hTsvAfoYEC3QAY00IWVxw9g2Lqb Rn4V5IC54dUezJNAgs72PQy4iwl1Dj5vSmTVeYcPmj/X11vM6gBE1JNfz3WLARnyhOOf rOcQ== X-Gm-Message-State: AOAM530XjomKYyxhemZ/lVrZ9f+bW82Dw00tiYYt87TMFaO7Vg1ydxFa S2m7eZkFJpFw32iCa9RW7UM0KQ== X-Google-Smtp-Source: ABdhPJxiUy0VPgMwBx+Gtgt9KHB4VMhTjzmZk29+O/BmQINbhNhalI0SnUGt8xo9L8gxRohjGILhBg== X-Received: by 2002:a5d:5009:: with SMTP id e9mr3539097wrt.104.1603270632595; Wed, 21 Oct 2020 01:57:12 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id q8sm2675939wro.32.2020.10.21.01.57.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2020 01:57:11 -0700 (PDT) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Vetter , Daniel Vetter , Jason Gunthorpe , Dan Williams , Kees Cook , Benjamin Herrensmidt , Dave Airlie , Andrew Morton , John Hubbard , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Daniel Vetter Subject: [PATCH v3 07/16] mm: Close race in generic_access_phys Date: Wed, 21 Oct 2020 10:56:46 +0200 Message-Id: <20201021085655.1192025-8-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> References: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Way back it was a reasonable assumptions that iomem mappings never change the pfn range they point at. But this has changed: - gpu drivers dynamically manage their memory nowadays, invalidating ptes with unmap_mapping_range when buffers get moved - contiguous dma allocations have moved from dedicated carvetouts to cma regions. This means if we miss the unmap the pfn might contain pagecache or anon memory (well anything allocated with GFP_MOVEABLE) - even /dev/mem now invalidates mappings when the kernel requests that iomem region when CONFIG_IO_STRICT_DEVMEM is set, see 3234ac664a87 ("/dev/mem: Revoke mappings when a driver claims the region") Accessing pfns obtained from ptes without holding all the locks is therefore no longer a good idea. Fix this. Since ioremap might need to manipulate pagetables too we need to drop the pt lock and have a retry loop if we raced. While at it, also add kerneldoc and improve the comment for the vma_ops->access function. It's for accessing, not for moving the memory from iomem to system memory, as the old comment seemed to suggest. References: 28b2ee20c7cb ("access_process_vm device memory infrastructure") Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Dan Williams Cc: Kees Cook Cc: Benjamin Herrensmidt Cc: Dave Airlie Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Signed-off-by: Daniel Vetter --- v2: Fix inversion in the retry check (John). --- include/linux/mm.h | 3 ++- mm/memory.c | 44 ++++++++++++++++++++++++++++++++++++++++++-- 2 files changed, 44 insertions(+), 3 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index acd60fbf1a5a..2a16631c1fda 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -566,7 +566,8 @@ struct vm_operations_struct { vm_fault_t (*pfn_mkwrite)(struct vm_fault *vmf); /* called by access_process_vm when get_user_pages() fails, typically - * for use by special VMAs that can switch between memory and hardware + * for use by special VMAs. See also generic_access_phys() for a generic + * implementation useful for any iomem mapping. */ int (*access)(struct vm_area_struct *vma, unsigned long addr, void *buf, int len, int write); diff --git a/mm/memory.c b/mm/memory.c index eeae590e526a..fff817608eb4 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -4840,28 +4840,68 @@ int follow_phys(struct vm_area_struct *vma, return ret; } +/** + * generic_access_phys - generic implementation for iomem mmap access + * @vma: the vma to access + * @addr: userspace addres, not relative offset within @vma + * @buf: buffer to read/write + * @len: length of transfer + * @write: set to FOLL_WRITE when writing, otherwise reading + * + * This is a generic implementation for &vm_operations_struct.access for an + * iomem mapping. This callback is used by access_process_vm() when the @vma is + * not page based. + */ int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, void *buf, int len, int write) { resource_size_t phys_addr; unsigned long prot = 0; void __iomem *maddr; + pte_t *ptep, pte; + spinlock_t *ptl; int offset = addr & (PAGE_SIZE-1); + int ret = -EINVAL; + + if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) + return -EINVAL; + +retry: + if (follow_pte(vma->vm_mm, addr, &ptep, &ptl)) + return -EINVAL; + pte = *ptep; + pte_unmap_unlock(ptep, ptl); - if (follow_phys(vma, addr, write, &prot, &phys_addr)) + prot = pgprot_val(pte_pgprot(pte)); + phys_addr = (resource_size_t)pte_pfn(pte) << PAGE_SHIFT; + + if ((write & FOLL_WRITE) && !pte_write(pte)) return -EINVAL; maddr = ioremap_prot(phys_addr, PAGE_ALIGN(len + offset), prot); if (!maddr) return -ENOMEM; + if (follow_pte(vma->vm_mm, addr, &ptep, &ptl)) + goto out_unmap; + + if (!pte_same(pte, *ptep)) { + pte_unmap_unlock(ptep, ptl); + iounmap(maddr); + + goto retry; + } + if (write) memcpy_toio(maddr + offset, buf, len); else memcpy_fromio(buf, maddr + offset, len); + ret = len; + pte_unmap_unlock(ptep, ptl); +out_unmap: iounmap(maddr); - return len; + return ret; } EXPORT_SYMBOL_GPL(generic_access_phys); #endif From patchwork Wed Oct 21 08:56:47 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11848623 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E65EE14B2 for ; Wed, 21 Oct 2020 08:57:24 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 8370D223C6 for ; Wed, 21 Oct 2020 08:57:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="TASte01L" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8370D223C6 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id AE5796B0073; Wed, 21 Oct 2020 04:57:16 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id A99DB6B0074; Wed, 21 Oct 2020 04:57:16 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8ECE86B0075; Wed, 21 Oct 2020 04:57:16 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0030.hostedemail.com [216.40.44.30]) by kanga.kvack.org (Postfix) with ESMTP id 584126B0073 for ; Wed, 21 Oct 2020 04:57:16 -0400 (EDT) Received: from smtpin26.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 01EA54DA6 for ; Wed, 21 Oct 2020 08:57:16 +0000 (UTC) X-FDA: 77395328472.26.elbow43_31161f527247 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin26.hostedemail.com (Postfix) with ESMTP id C28411804B654 for ; Wed, 21 Oct 2020 08:57:15 +0000 (UTC) X-Spam-Summary: 1,0,0,13766b7dc8edede1,d41d8cd98f00b204,daniel.vetter@ffwll.ch,,RULES_HIT:1:2:41:69:152:355:379:541:800:960:966:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1593:1594:1605:1730:1747:1777:1792:2196:2198:2199:2200:2393:2553:2559:2562:2901:3138:3139:3140:3141:3142:3865:3867:3868:3871:3872:3874:4050:4250:4321:4385:5007:6117:6119:6261:6653:6742:7875:7903:9592:11026:11232:11473:11658:11914:12043:12050:12291:12296:12297:12438:12517:12519:12555:12683:12895:13161:13229:13846:13894:14394:14659:21080:21324:21433:21444:21451:21627:21990:30003:30012:30051:30054:30064:30070:30090,0,RBL:209.85.221.68:@ffwll.ch:.lbl8.mailshell.net-62.8.0.100 66.201.201.201;04yrdbmdzshxsyw4mjgdy6a8brfaropusiykr5yienwa7yixmqhhkf51s6gdpzh.5meyduh9nua17b5fbtssy6t1r5w4cfogjwrjccrouu41os3dnydpnqgzodhehty.e-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:none,Custom_rules:0:1:0,LFtime:36,LUA_ SUMMARY: X-HE-Tag: elbow43_31161f527247 X-Filterd-Recvd-Size: 10489 Received: from mail-wr1-f68.google.com (mail-wr1-f68.google.com [209.85.221.68]) by imf06.hostedemail.com (Postfix) with ESMTP for ; Wed, 21 Oct 2020 08:57:15 +0000 (UTC) Received: by mail-wr1-f68.google.com with SMTP id j7so2058165wrt.9 for ; Wed, 21 Oct 2020 01:57:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=S+7ufuislqzXK0m1Ak/J4PVW8igwq369gehzbG0B91s=; b=TASte01LfK3tJrNEskEJg0JBrkEwFReNqZJcsPAqw0ud/54iE3NFZPYAz4seclzObY 8qyaNJ7feKdYZc7R1FFJdgR6e4chx6xmBKBCGr9MetZUB65nJ+IYSxcj8fXdkIxAF9Wa 835vPJ0u8wjGgm4Lqk1+pFbsMYj81cW6UvpFg= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=S+7ufuislqzXK0m1Ak/J4PVW8igwq369gehzbG0B91s=; b=Kq/q+Rb9YmeMNywVwUW2v8BINFc4fpfp6PwLHYr/xFC1ael4RnwzGKe+N3YQ7VXA/Q UvrwnLkfNaVzwpNOuZXjl4VhcEvoQgPmfTdMBrESPiS2djK0z7IGqlwc/mP8OxXpx8Ku SVFAzyXCQD/VWV7kl/F5DoFuz96ixkYn+eDJtlIIlPeGNsMdUfMz8rn9bK27uomucm8R H0W+gwJ6WthfkNIWXEh+TPGCCJVxmKBzvsmVEO3ub4Xge9jpiO/ZFGKAacgUUmYpt3ve E2Vs0v3ac8es/TCkCXdEguvwuBctNbwy2oVGnZZ8GJEYh4ZixazC/Ak++sbVIArM+zdD Ui8w== X-Gm-Message-State: AOAM530m+NDIO+sCWwayPaDmhXJjsD6717GYdSqPjPHx3xqQDKcC2+VB 9HUw7RnT7VJ2/lWrzTBZ4NukEg== X-Google-Smtp-Source: ABdhPJzgdpJKzdh0Z7/Ixx6DmwTqWbM+l3YLKx7fvymTBFfXMek7eKSHLlh0kohA3cb0UMcaEODvqA== X-Received: by 2002:a5d:6a4f:: with SMTP id t15mr3390316wrw.126.1603270634157; Wed, 21 Oct 2020 01:57:14 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id q8sm2675939wro.32.2020.10.21.01.57.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2020 01:57:13 -0700 (PDT) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Vetter , Gerald Schaefer , Daniel Vetter , Jason Gunthorpe , Dan Williams , Kees Cook , Andrew Morton , John Hubbard , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Niklas Schnelle , Daniel Vetter Subject: [PATCH v3 08/16] s390/pci: Remove races against pte updates Date: Wed, 21 Oct 2020 10:56:47 +0200 Message-Id: <20201021085655.1192025-9-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> References: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Way back it was a reasonable assumptions that iomem mappings never change the pfn range they point at. But this has changed: - gpu drivers dynamically manage their memory nowadays, invalidating ptes with unmap_mapping_range when buffers get moved - contiguous dma allocations have moved from dedicated carvetouts to cma regions. This means if we miss the unmap the pfn might contain pagecache or anon memory (well anything allocated with GFP_MOVEABLE) - even /dev/mem now invalidates mappings when the kernel requests that iomem region when CONFIG_IO_STRICT_DEVMEM is set, see commit 3234ac664a87 ("/dev/mem: Revoke mappings when a driver claims the region") Accessing pfns obtained from ptes without holding all the locks is therefore no longer a good idea. Fix this. Since zpci_memcpy_from|toio seems to not do anything nefarious with locks we just need to open code get_pfn and follow_pfn and make sure we drop the locks only after we're done. The write function also needs the copy_from_user move, since we can't take userspace faults while holding the mmap sem. v2: Move VM_IO | VM_PFNMAP checks around so they keep returning EINVAL like before (Gerard) v3: Polish commit message (Niklas) Reviewed-by: Gerald Schaefer Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Dan Williams Cc: Kees Cook Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: Niklas Schnelle Cc: Gerald Schaefer Cc: linux-s390@vger.kernel.org Cc: Niklas Schnelle Signed-off-by: Daniel Vetter --- arch/s390/pci/pci_mmio.c | 98 +++++++++++++++++++++++----------------- 1 file changed, 57 insertions(+), 41 deletions(-) diff --git a/arch/s390/pci/pci_mmio.c b/arch/s390/pci/pci_mmio.c index 401cf670a243..1a6adbc68ee8 100644 --- a/arch/s390/pci/pci_mmio.c +++ b/arch/s390/pci/pci_mmio.c @@ -119,33 +119,15 @@ static inline int __memcpy_toio_inuser(void __iomem *dst, return rc; } -static long get_pfn(unsigned long user_addr, unsigned long access, - unsigned long *pfn) -{ - struct vm_area_struct *vma; - long ret; - - mmap_read_lock(current->mm); - ret = -EINVAL; - vma = find_vma(current->mm, user_addr); - if (!vma) - goto out; - ret = -EACCES; - if (!(vma->vm_flags & access)) - goto out; - ret = follow_pfn(vma, user_addr, pfn); -out: - mmap_read_unlock(current->mm); - return ret; -} - SYSCALL_DEFINE3(s390_pci_mmio_write, unsigned long, mmio_addr, const void __user *, user_buffer, size_t, length) { u8 local_buf[64]; void __iomem *io_addr; void *buf; - unsigned long pfn; + struct vm_area_struct *vma; + pte_t *ptep; + spinlock_t *ptl; long ret; if (!zpci_is_enabled()) @@ -158,7 +140,7 @@ SYSCALL_DEFINE3(s390_pci_mmio_write, unsigned long, mmio_addr, * We only support write access to MIO capable devices if we are on * a MIO enabled system. Otherwise we would have to check for every * address if it is a special ZPCI_ADDR and would have to do - * a get_pfn() which we don't need for MIO capable devices. Currently + * a pfn lookup which we don't need for MIO capable devices. Currently * ISM devices are the only devices without MIO support and there is no * known need for accessing these from userspace. */ @@ -176,21 +158,37 @@ SYSCALL_DEFINE3(s390_pci_mmio_write, unsigned long, mmio_addr, } else buf = local_buf; - ret = get_pfn(mmio_addr, VM_WRITE, &pfn); + ret = -EFAULT; + if (copy_from_user(buf, user_buffer, length)) + goto out_free; + + mmap_read_lock(current->mm); + ret = -EINVAL; + vma = find_vma(current->mm, mmio_addr); + if (!vma) + goto out_unlock_mmap; + if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) + goto out_unlock_mmap; + ret = -EACCES; + if (!(vma->vm_flags & VM_WRITE)) + goto out_unlock_mmap; + + ret = follow_pte_pmd(vma->vm_mm, mmio_addr, NULL, &ptep, NULL, &ptl); if (ret) - goto out; - io_addr = (void __iomem *)((pfn << PAGE_SHIFT) | + goto out_unlock_mmap; + + io_addr = (void __iomem *)((pte_pfn(*ptep) << PAGE_SHIFT) | (mmio_addr & ~PAGE_MASK)); - ret = -EFAULT; if ((unsigned long) io_addr < ZPCI_IOMAP_ADDR_BASE) - goto out; - - if (copy_from_user(buf, user_buffer, length)) - goto out; + goto out_unlock_pt; ret = zpci_memcpy_toio(io_addr, buf, length); -out: +out_unlock_pt: + pte_unmap_unlock(ptep, ptl); +out_unlock_mmap: + mmap_read_unlock(current->mm); +out_free: if (buf != local_buf) kfree(buf); return ret; @@ -274,7 +272,9 @@ SYSCALL_DEFINE3(s390_pci_mmio_read, unsigned long, mmio_addr, u8 local_buf[64]; void __iomem *io_addr; void *buf; - unsigned long pfn; + struct vm_area_struct *vma; + pte_t *ptep; + spinlock_t *ptl; long ret; if (!zpci_is_enabled()) @@ -287,7 +287,7 @@ SYSCALL_DEFINE3(s390_pci_mmio_read, unsigned long, mmio_addr, * We only support read access to MIO capable devices if we are on * a MIO enabled system. Otherwise we would have to check for every * address if it is a special ZPCI_ADDR and would have to do - * a get_pfn() which we don't need for MIO capable devices. Currently + * a pfn lookup which we don't need for MIO capable devices. Currently * ISM devices are the only devices without MIO support and there is no * known need for accessing these from userspace. */ @@ -306,22 +306,38 @@ SYSCALL_DEFINE3(s390_pci_mmio_read, unsigned long, mmio_addr, buf = local_buf; } - ret = get_pfn(mmio_addr, VM_READ, &pfn); + mmap_read_lock(current->mm); + ret = -EINVAL; + vma = find_vma(current->mm, mmio_addr); + if (!vma) + goto out_unlock_mmap; + if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) + goto out_unlock_mmap; + ret = -EACCES; + if (!(vma->vm_flags & VM_WRITE)) + goto out_unlock_mmap; + + ret = follow_pte_pmd(vma->vm_mm, mmio_addr, NULL, &ptep, NULL, &ptl); if (ret) - goto out; - io_addr = (void __iomem *)((pfn << PAGE_SHIFT) | (mmio_addr & ~PAGE_MASK)); + goto out_unlock_mmap; + + io_addr = (void __iomem *)((pte_pfn(*ptep) << PAGE_SHIFT) | + (mmio_addr & ~PAGE_MASK)); if ((unsigned long) io_addr < ZPCI_IOMAP_ADDR_BASE) { ret = -EFAULT; - goto out; + goto out_unlock_pt; } ret = zpci_memcpy_fromio(buf, io_addr, length); - if (ret) - goto out; - if (copy_to_user(user_buffer, buf, length)) + +out_unlock_pt: + pte_unmap_unlock(ptep, ptl); +out_unlock_mmap: + mmap_read_unlock(current->mm); + + if (!ret && copy_to_user(user_buffer, buf, length)) ret = -EFAULT; -out: if (buf != local_buf) kfree(buf); return ret; From patchwork Wed Oct 21 08:56:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11848625 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 44BD814B2 for ; Wed, 21 Oct 2020 08:57:27 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id DB3412242E for ; Wed, 21 Oct 2020 08:57:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="T/wziZBv" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DB3412242E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 123266B0074; Wed, 21 Oct 2020 04:57:18 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 0D4646B0075; Wed, 21 Oct 2020 04:57:18 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EDFA06B0078; Wed, 21 Oct 2020 04:57:17 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0219.hostedemail.com [216.40.44.219]) by kanga.kvack.org (Postfix) with ESMTP id BEFC16B0074 for ; Wed, 21 Oct 2020 04:57:17 -0400 (EDT) Received: from smtpin22.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 683214DA6 for ; Wed, 21 Oct 2020 08:57:17 +0000 (UTC) X-FDA: 77395328514.22.swing43_340201927247 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin22.hostedemail.com (Postfix) with ESMTP id 46F5D18038E60 for ; Wed, 21 Oct 2020 08:57:17 +0000 (UTC) X-Spam-Summary: 1,0,0,ae2dfaadde0dda11,d41d8cd98f00b204,daniel.vetter@ffwll.ch,,RULES_HIT:2:41:152:355:379:541:800:960:966:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1535:1593:1594:1605:1730:1747:1777:1792:2194:2196:2198:2199:2200:2201:2393:2553:2559:2562:2693:2894:2901:2903:3138:3139:3140:3141:3142:3743:3865:3866:3867:3868:3870:3871:3872:3873:3874:4049:4120:4250:4321:4385:4605:5007:6117:6119:6261:6653:6742:7875:7903:8784:9165:10004:11026:11473:11658:11914:12043:12050:12291:12296:12297:12438:12517:12519:12555:12683:12895:12986:13161:13229:13846:13894:14096:14097:14394:14659:21080:21324:21444:21451:21627:21740:21795:21939:21966:21990:30003:30025:30051:30054:30064:30070:30090,0,RBL:209.85.221.67:@ffwll.ch:.lbl8.mailshell.net-66.201.201.201 62.8.0.100;04yrjscu61pyqks55jd6ab84o91n7ocpk9jqqrm89ubyt746xxgi8i49feodqs6.qtib8zhubx9687qjtuiyxbnir695xbe1z59d3wqzdwfgqeqfa1ep5h1gxt1seda.e-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Net check:no X-HE-Tag: swing43_340201927247 X-Filterd-Recvd-Size: 9408 Received: from mail-wr1-f67.google.com (mail-wr1-f67.google.com [209.85.221.67]) by imf06.hostedemail.com (Postfix) with ESMTP for ; Wed, 21 Oct 2020 08:57:16 +0000 (UTC) Received: by mail-wr1-f67.google.com with SMTP id x7so2156016wrl.3 for ; Wed, 21 Oct 2020 01:57:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=6FXNrAQVDv1GTk8GGIBMBQb/Z7TasoUYfJDj34pJUVI=; b=T/wziZBvTeYdpgXtCKfWeTCOgG6ZxQR1iNX7ttAqm5X7cINbcDOihlyivfIStE4ANr 0qrqTjm8QE7XBP58Kl+sS22BQ+9w8LYcHgu8lltEf/ygHjiE7VPVTCnywJMpDHX3sgzA Ygc4PLFqiL0ZtCsDJT7/VAACIReSV3eUwGPjQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=6FXNrAQVDv1GTk8GGIBMBQb/Z7TasoUYfJDj34pJUVI=; b=qalp5RkwrOkLe5Kcu3l0JmWyspld+FWZri4ACF44mO205KOtP9n7EFYg4kUPjBbyXC F2eShwjt3VCmpRj0o4XlkZUvXwBczsw275qTkjjkEy20mY7pPrwhTrsuMZ7h/kMKTFeD z+YMcGmjKv8Ua80TYq1MvrC5mbA5SBz10/646MBFMVqDOgF+BDIQhHeq/iohcFb38tWz qNp8ivXBq05DF7KYMbUfiPr3Cb3uLQtcsXoT+eOS2bNZPTxqcz4pKcWlbipMZSWYRAQ7 HPfSYbNbB67c/lREWo91IxH8YWXMN4s+uR2NY/D0EitaGj/ZLFiC2zKyinTGEcvaWe+e 6Bzw== X-Gm-Message-State: AOAM531SCXb7fD10bgwsUe7AJWC0hQ2sXDpP34ZChSVvGsqixGfCXRGs zYTbfsx8Q92z1Em0BHMYWnI/xg== X-Google-Smtp-Source: ABdhPJw8jFUGdXy3ZpYF3vCPjAT9o/iNmVHD7rY86u4NG9L79ReYww5XLftER1AdoF7j6wSADq055Q== X-Received: by 2002:adf:94e3:: with SMTP id 90mr3176123wrr.380.1603270635628; Wed, 21 Oct 2020 01:57:15 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id q8sm2675939wro.32.2020.10.21.01.57.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2020 01:57:14 -0700 (PDT) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Vetter , Daniel Vetter , Jason Gunthorpe , Kees Cook , Dan Williams , Andrew Morton , John Hubbard , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Daniel Vetter Subject: [PATCH v3 09/16] mm: Add unsafe_follow_pfn Date: Wed, 21 Oct 2020 10:56:48 +0200 Message-Id: <20201021085655.1192025-10-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> References: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Way back it was a reasonable assumptions that iomem mappings never change the pfn range they point at. But this has changed: - gpu drivers dynamically manage their memory nowadays, invalidating ptes with unmap_mapping_range when buffers get moved - contiguous dma allocations have moved from dedicated carvetouts to cma regions. This means if we miss the unmap the pfn might contain pagecache or anon memory (well anything allocated with GFP_MOVEABLE) - even /dev/mem now invalidates mappings when the kernel requests that iomem region when CONFIG_IO_STRICT_DEVMEM is set, see 3234ac664a87 ("/dev/mem: Revoke mappings when a driver claims the region") Accessing pfns obtained from ptes without holding all the locks is therefore no longer a good idea. Unfortunately there's some users where this is not fixable (like v4l userptr of iomem mappings) or involves a pile of work (vfio type1 iommu). For now annotate these as unsafe and splat appropriately. This patch adds an unsafe_follow_pfn, which later patches will then roll out to all appropriate places. Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Kees Cook Cc: Dan Williams Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: kvm@vger.kernel.org Signed-off-by: Daniel Vetter --- include/linux/mm.h | 2 ++ mm/memory.c | 32 +++++++++++++++++++++++++++++++- mm/nommu.c | 17 +++++++++++++++++ security/Kconfig | 13 +++++++++++++ 4 files changed, 63 insertions(+), 1 deletion(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 2a16631c1fda..ec8c90928fc9 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1653,6 +1653,8 @@ int follow_pte_pmd(struct mm_struct *mm, unsigned long address, pte_t **ptepp, pmd_t **pmdpp, spinlock_t **ptlp); int follow_pfn(struct vm_area_struct *vma, unsigned long address, unsigned long *pfn); +int unsafe_follow_pfn(struct vm_area_struct *vma, unsigned long address, + unsigned long *pfn); int follow_phys(struct vm_area_struct *vma, unsigned long address, unsigned int flags, unsigned long *prot, resource_size_t *phys); int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, diff --git a/mm/memory.c b/mm/memory.c index fff817608eb4..bcba4e8f1501 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -4788,7 +4788,12 @@ EXPORT_SYMBOL(follow_pte_pmd); * @address: user virtual address * @pfn: location to store found PFN * - * Only IO mappings and raw PFN mappings are allowed. + * Only IO mappings and raw PFN mappings are allowed. Note that callers must + * ensure coherency with pte updates by using a &mmu_notifier to follow updates. + * If this is not feasible, or the access to the @pfn is only very short term, + * use follow_pte_pmd() instead and hold the pagetable lock for the duration of + * the access instead. Any caller not following these requirements must use + * unsafe_follow_pfn() instead. * * Return: zero and the pfn at @pfn on success, -ve otherwise. */ @@ -4811,6 +4816,31 @@ int follow_pfn(struct vm_area_struct *vma, unsigned long address, } EXPORT_SYMBOL(follow_pfn); +/** + * unsafe_follow_pfn - look up PFN at a user virtual address + * @vma: memory mapping + * @address: user virtual address + * @pfn: location to store found PFN + * + * Only IO mappings and raw PFN mappings are allowed. + * + * Returns zero and the pfn at @pfn on success, -ve otherwise. + */ +int unsafe_follow_pfn(struct vm_area_struct *vma, unsigned long address, + unsigned long *pfn) +{ +#ifdef CONFIG_STRICT_FOLLOW_PFN + pr_info("unsafe follow_pfn usage rejected, see CONFIG_STRICT_FOLLOW_PFN\n"); + return -EINVAL; +#else + WARN_ONCE(1, "unsafe follow_pfn usage\n"); + add_taint(TAINT_USER, LOCKDEP_STILL_OK); + + return follow_pfn(vma, address, pfn); +#endif +} +EXPORT_SYMBOL(unsafe_follow_pfn); + #ifdef CONFIG_HAVE_IOREMAP_PROT int follow_phys(struct vm_area_struct *vma, unsigned long address, unsigned int flags, diff --git a/mm/nommu.c b/mm/nommu.c index 75a327149af1..3db2910f0d64 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -132,6 +132,23 @@ int follow_pfn(struct vm_area_struct *vma, unsigned long address, } EXPORT_SYMBOL(follow_pfn); +/** + * unsafe_follow_pfn - look up PFN at a user virtual address + * @vma: memory mapping + * @address: user virtual address + * @pfn: location to store found PFN + * + * Only IO mappings and raw PFN mappings are allowed. + * + * Returns zero and the pfn at @pfn on success, -ve otherwise. + */ +int unsafe_follow_pfn(struct vm_area_struct *vma, unsigned long address, + unsigned long *pfn) +{ + return follow_pfn(vma, address, pfn); +} +EXPORT_SYMBOL(unsafe_follow_pfn); + LIST_HEAD(vmap_area_list); void vfree(const void *addr) diff --git a/security/Kconfig b/security/Kconfig index 7561f6f99f1d..48945402e103 100644 --- a/security/Kconfig +++ b/security/Kconfig @@ -230,6 +230,19 @@ config STATIC_USERMODEHELPER_PATH If you wish for all usermode helper programs to be disabled, specify an empty string here (i.e. ""). +config STRICT_FOLLOW_PFN + bool "Disable unsafe use of follow_pfn" + depends on MMU + help + Some functionality in the kernel follows userspace mappings to iomem + ranges in an unsafe matter. Examples include v4l userptr for zero-copy + buffers sharing. + + If this option is switched on, such access is rejected. Only enable + this option when you must run userspace which requires this. + + If in doubt, say Y. + source "security/selinux/Kconfig" source "security/smack/Kconfig" source "security/tomoyo/Kconfig" From patchwork Wed Oct 21 08:56:49 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11848627 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7469214B4 for ; Wed, 21 Oct 2020 08:57:29 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2F698223FB for ; Wed, 21 Oct 2020 08:57:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="K873XhCK" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2F698223FB Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 9877B6B0075; Wed, 21 Oct 2020 04:57:19 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 9115D6B0078; Wed, 21 Oct 2020 04:57:19 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7165C6B007B; Wed, 21 Oct 2020 04:57:19 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0097.hostedemail.com [216.40.44.97]) by kanga.kvack.org (Postfix) with ESMTP id 4652B6B0075 for ; Wed, 21 Oct 2020 04:57:19 -0400 (EDT) Received: from smtpin13.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id E8700180AD807 for ; Wed, 21 Oct 2020 08:57:18 +0000 (UTC) X-FDA: 77395328556.13.push90_071399327247 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin13.hostedemail.com (Postfix) with ESMTP id C099018140B60 for ; Wed, 21 Oct 2020 08:57:18 +0000 (UTC) X-Spam-Summary: 1,0,0,1cf2a22f6a464835,d41d8cd98f00b204,daniel.vetter@ffwll.ch,,RULES_HIT:41:152:355:379:541:800:960:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1535:1543:1593:1594:1711:1730:1747:1777:1792:2194:2198:2199:2200:2393:2553:2559:2562:2693:3138:3139:3140:3141:3142:3354:3865:3867:3868:3870:3871:3872:3874:4117:4321:5007:6261:6653:6742:6743:7875:8603:9036:10004:10400:11026:11232:11657:11658:11914:12043:12296:12297:12438:12517:12519:12555:12895:13095:13161:13229:13846:13894:14181:14394:14659:14721:14819:21080:21433:21444:21451:21627:21740:21773:30054:30064:30090,0,RBL:209.85.221.65:@ffwll.ch:.lbl8.mailshell.net-62.8.0.100 66.201.201.201;04y8pupd4f8exumyqp6udb377zff9opsxews6q98sj98igcjprexqiufggpkkzn.p3macecgk7crd4tpf6gj8pc86bj9rupfq3nan5mxo7ypr8tzisshrcm9fyk7u1k.s-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:none,Custom_rules:0:0:0,LFtime:23,LUA_SUMMARY:none X-HE-Tag: push90_071399327247 X-Filterd-Recvd-Size: 6880 Received: from mail-wr1-f65.google.com (mail-wr1-f65.google.com [209.85.221.65]) by imf07.hostedemail.com (Postfix) with ESMTP for ; Wed, 21 Oct 2020 08:57:18 +0000 (UTC) Received: by mail-wr1-f65.google.com with SMTP id g12so2037120wrp.10 for ; Wed, 21 Oct 2020 01:57:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=62xo6Yc+okj8E3g2nExt24JkphJyecIdIYx1MX/KcgQ=; b=K873XhCKhky8xYu7l9PH0L4vvRQ8W4kOqwGB7em4FSZU/FH2w3o/Fs6+QECyRAghOu 8q8OodzeuuFUxMzw/vVk1/yMCBxwVGl1BeYckPl4pNsKxDrGH6PmKMHuJ2X/ASVVgbzy 2gMkhgZs8aQVpZ+fDa84ImMGzU1FdBr7OgsW4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=62xo6Yc+okj8E3g2nExt24JkphJyecIdIYx1MX/KcgQ=; b=VWlPWHGFmGQwGpAAGMuP/eES+sfsielWBZApHZqEDV1RNl0KcZGU0TlAAyMV5qumX/ Rc8DRmSIpm+u7GA//nMWG3QcDL50Ts0atexIGJ8iDwXIgVLBwdl2A9gDLH76V7Dt/yEn MEaKP5XxH91/Tn5sCZnEx3rlwL0RWrpAlzcz9XhK8/24NmJyfqgRvZO9lEMQUBuxgugi sFTFaP3FEuP/HKoEDX9mFreC7kevUwCua4H7Gb19iEDj7eyxbFom0njJMGYcta6uFx72 erNNp63TxysGA4cXcyrEx2wTQ7tevkqKAJOrW2DC4nBQWq92NiM2ptmjvaF2UGH5g/Y4 dhQg== X-Gm-Message-State: AOAM533vbHh0yQqG1Kq1S8ApDj2HC53WZuugzEA77mUYz5EzBf9J3zrb Ee8aOp85KhaovgzDkGfB4PGpUg== X-Google-Smtp-Source: ABdhPJxBj+/fddzStMvRlNb0kPGellflBixkVVFjchw9D6JBYyFT9T4kixhMP79NqV0iv84nhiR1VA== X-Received: by 2002:a5d:480a:: with SMTP id l10mr3285006wrq.238.1603270637190; Wed, 21 Oct 2020 01:57:17 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id q8sm2675939wro.32.2020.10.21.01.57.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2020 01:57:16 -0700 (PDT) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Vetter , Daniel Vetter , Jason Gunthorpe , Kees Cook , Dan Williams , Andrew Morton , John Hubbard , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Pawel Osciak , Marek Szyprowski , Kyungmin Park , Tomasz Figa , Laurent Dufour , Vlastimil Babka , Daniel Jordan , Michel Lespinasse , Daniel Vetter Subject: [PATCH v3 10/16] media/videbuf1|2: Mark follow_pfn usage as unsafe Date: Wed, 21 Oct 2020 10:56:49 +0200 Message-Id: <20201021085655.1192025-11-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> References: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: The media model assumes that buffers are all preallocated, so that when a media pipeline is running we never miss a deadline because the buffers aren't allocated or available. This means we cannot fix the v4l follow_pfn usage through mmu_notifier, without breaking how this all works. The only real fix is to deprecate userptr support for VM_IO | VM_PFNMAP mappings and tell everyone to cut over to dma-buf memory sharing for zerocopy. userptr for normal memory will keep working as-is, this only affects the zerocopy userptr usage enabled in 50ac952d2263 ("[media] videobuf2-dma-sg: Support io userptr operations on io memory"). Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Kees Cook Cc: Dan Williams Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: Pawel Osciak Cc: Marek Szyprowski Cc: Kyungmin Park Cc: Tomasz Figa Cc: Laurent Dufour Cc: Vlastimil Babka Cc: Daniel Jordan Cc: Michel Lespinasse Signed-off-by: Daniel Vetter --- v3: - Reference the commit that enabled the zerocopy userptr use case to make it abundandtly clear that this patch only affects that, and not normal memory userptr. The old commit message already explained that normal memory userptr is unaffected, but I guess that was not clear enough. --- drivers/media/common/videobuf2/frame_vector.c | 2 +- drivers/media/v4l2-core/videobuf-dma-contig.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/media/common/videobuf2/frame_vector.c b/drivers/media/common/videobuf2/frame_vector.c index 6590987c14bd..e630494da65c 100644 --- a/drivers/media/common/videobuf2/frame_vector.c +++ b/drivers/media/common/videobuf2/frame_vector.c @@ -69,7 +69,7 @@ int get_vaddr_frames(unsigned long start, unsigned int nr_frames, break; while (ret < nr_frames && start + PAGE_SIZE <= vma->vm_end) { - err = follow_pfn(vma, start, &nums[ret]); + err = unsafe_follow_pfn(vma, start, &nums[ret]); if (err) { if (ret == 0) ret = err; diff --git a/drivers/media/v4l2-core/videobuf-dma-contig.c b/drivers/media/v4l2-core/videobuf-dma-contig.c index 52312ce2ba05..821c4a76ab96 100644 --- a/drivers/media/v4l2-core/videobuf-dma-contig.c +++ b/drivers/media/v4l2-core/videobuf-dma-contig.c @@ -183,7 +183,7 @@ static int videobuf_dma_contig_user_get(struct videobuf_dma_contig_memory *mem, user_address = untagged_baddr; while (pages_done < (mem->size >> PAGE_SHIFT)) { - ret = follow_pfn(vma, user_address, &this_pfn); + ret = unsafe_follow_pfn(vma, user_address, &this_pfn); if (ret) break; From patchwork Wed Oct 21 08:56:50 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11848629 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E824014B4 for ; Wed, 21 Oct 2020 08:57:31 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 9F5BD2245F for ; Wed, 21 Oct 2020 08:57:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="Ijq3ip5+" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9F5BD2245F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 2D3C16B0078; Wed, 21 Oct 2020 04:57:21 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 2AB696B007B; Wed, 21 Oct 2020 04:57:21 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1298B6B007D; Wed, 21 Oct 2020 04:57:20 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0233.hostedemail.com [216.40.44.233]) by kanga.kvack.org (Postfix) with ESMTP id C99846B0078 for ; Wed, 21 Oct 2020 04:57:20 -0400 (EDT) Received: from smtpin22.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 639D6181AC9CC for ; Wed, 21 Oct 2020 08:57:20 +0000 (UTC) X-FDA: 77395328640.22.cord91_0603d8e27247 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin22.hostedemail.com (Postfix) with ESMTP id 24A9818038E60 for ; Wed, 21 Oct 2020 08:57:20 +0000 (UTC) X-Spam-Summary: 1,0,0,95705a6a0672bfa6,d41d8cd98f00b204,daniel.vetter@ffwll.ch,,RULES_HIT:41:152:355:379:541:800:960:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1535:1541:1593:1594:1711:1730:1747:1777:1792:2194:2199:2393:2553:2559:2562:2693:2901:2903:3138:3139:3140:3141:3142:3353:3865:3867:3871:3874:4321:5007:6117:6119:6261:6653:6742:7903:10004:10400:11026:11473:11658:11914:12043:12296:12297:12438:12517:12519:12555:12895:13069:13161:13229:13311:13357:13846:13894:14096:14097:14181:14394:14659:14721:21080:21444:21451:21627:21939:21990:30012:30054:30064:30090,0,RBL:209.85.128.66:@ffwll.ch:.lbl8.mailshell.net-62.8.0.100 66.201.201.201;04yfts94diks77z5fiik8uy8ta4uuypgci3af69iyo1jieyda4xx1wpwupz8ca6.hkhebehsqj36hkza8y6t7q74nff7jituttyqihwmabubz1bbqqd7cgb7bdxa34a.g-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:none,Custom_rules:0:0:0,LFtime:24,LUA_SUMMARY:none X-HE-Tag: cord91_0603d8e27247 X-Filterd-Recvd-Size: 5372 Received: from mail-wm1-f66.google.com (mail-wm1-f66.google.com [209.85.128.66]) by imf22.hostedemail.com (Postfix) with ESMTP for ; Wed, 21 Oct 2020 08:57:19 +0000 (UTC) Received: by mail-wm1-f66.google.com with SMTP id b127so897130wmb.3 for ; Wed, 21 Oct 2020 01:57:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=8pur25W5Shkh1hHfFCpksS7ceNn2PKF9z82vTsiLN4c=; b=Ijq3ip5+wV7cd7njUb6RsVnXV8g8Owp5iMrdu9TyvAk5qDDhPeT5XCXN2ALGJhsrbp P5zOBKKXwRlNfH4L8OnR7mPoL971Mg4a7xN8q3N/PXmFtuMp/lDcW0snMDX7TnNSFxlk g5M5E6R5TEskXfmkH4sQcqsHcoV8Z7W9kahWs= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=8pur25W5Shkh1hHfFCpksS7ceNn2PKF9z82vTsiLN4c=; b=Ad/j60YVDMxHqQ+H6VvM9SB186fiBwgPJUFcUFy406QFCBjSBBAOqu6zgfWuX81c8e VFCBl6h9/qJLpOaf5bJNhdpyJ9hFQ7hFJTc1DbFj8xg3UZEjTcpqviso7cn2VgfOh0Id RvLYsVT8Ns4+1x7oBnxrusYfee9mMENUU5WzUHrckgXz5PB57Zo8Js4yL0jYpj2dJcvC zP0LfLFm8Gz/a7K8iRyFBUsnqo4b5MVsgL4VWdcR31HJfwacWgivLhxMAGRg9TenQfHc q37crpMMpPAlcI/CC2wHD0XUpul9X41sIADn3VAlhqm26Nu4o6T/Bt26ZsxiALo+LJ9T dwxQ== X-Gm-Message-State: AOAM530WDPo5MiWnduSrDLM2JISauzC8EmuzxnrdICutpKXcGBn7NRbI cvy5ty1r7CTYrLo6IYBYW/YUwQ== X-Google-Smtp-Source: ABdhPJzNaFnr3EWeDP7k0cF2AHbtycSZcq0l7yhT5Nq82x3yeqTKgKPKUR9qmyptj9g+y8CFHwWMGg== X-Received: by 2002:a1c:2c02:: with SMTP id s2mr2512532wms.66.1603270638556; Wed, 21 Oct 2020 01:57:18 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id q8sm2675939wro.32.2020.10.21.01.57.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2020 01:57:17 -0700 (PDT) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Vetter , Daniel Vetter , Jason Gunthorpe , Kees Cook , Dan Williams , Andrew Morton , John Hubbard , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Alex Williamson , Cornelia Huck , Daniel Vetter Subject: [PATCH v3 11/16] vfio/type1: Mark follow_pfn as unsafe Date: Wed, 21 Oct 2020 10:56:50 +0200 Message-Id: <20201021085655.1192025-12-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> References: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: The code seems to stuff these pfns into iommu pts (or something like that, I didn't follow), but there's no mmu_notifier to ensure that access is synchronized with pte updates. Hence mark these as unsafe. This means that with CONFIG_STRICT_FOLLOW_PFN, these will be rejected. Real fix is to wire up an mmu_notifier ... somehow. Probably means any invalidate is a fatal fault for this vfio device, but then this shouldn't ever happen if userspace is reasonable. Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Kees Cook Cc: Dan Williams Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: Alex Williamson Cc: Cornelia Huck Cc: kvm@vger.kernel.org Signed-off-by: Daniel Vetter --- drivers/vfio/vfio_iommu_type1.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 5fbf0c1f7433..a4d53f3d0a35 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -421,7 +421,7 @@ static int follow_fault_pfn(struct vm_area_struct *vma, struct mm_struct *mm, { int ret; - ret = follow_pfn(vma, vaddr, pfn); + ret = unsafe_follow_pfn(vma, vaddr, pfn); if (ret) { bool unlocked = false; @@ -435,7 +435,7 @@ static int follow_fault_pfn(struct vm_area_struct *vma, struct mm_struct *mm, if (ret) return ret; - ret = follow_pfn(vma, vaddr, pfn); + ret = unsafe_follow_pfn(vma, vaddr, pfn); } return ret; From patchwork Wed Oct 21 08:56:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11848631 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6657914B4 for ; Wed, 21 Oct 2020 08:57:34 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 070692242F for ; Wed, 21 Oct 2020 08:57:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="GUK8bAu/" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 070692242F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 3BDA66B007B; Wed, 21 Oct 2020 04:57:22 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 36B896B007D; Wed, 21 Oct 2020 04:57:22 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 25AEA6B007E; Wed, 21 Oct 2020 04:57:22 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0187.hostedemail.com [216.40.44.187]) by kanga.kvack.org (Postfix) with ESMTP id EF29A6B007B for ; Wed, 21 Oct 2020 04:57:21 -0400 (EDT) Received: from smtpin10.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 9B2B4181AC9CC for ; Wed, 21 Oct 2020 08:57:21 +0000 (UTC) X-FDA: 77395328682.10.bulb60_2104bba27247 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin10.hostedemail.com (Postfix) with ESMTP id 76BE416A4AD for ; Wed, 21 Oct 2020 08:57:21 +0000 (UTC) X-Spam-Summary: 1,0,0,0332234f58cbcb43,d41d8cd98f00b204,daniel.vetter@ffwll.ch,,RULES_HIT:41:152:355:379:541:800:960:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1535:1541:1593:1594:1711:1730:1747:1777:1792:2393:2553:2559:2562:2901:3138:3139:3140:3141:3142:3352:3865:3867:3868:3870:3871:3872:5007:6261:6653:6742:7903:10004:10400:11026:11473:11658:11914:12043:12297:12438:12517:12519:12555:12663:12679:12895:13069:13095:13161:13184:13229:13311:13357:13846:13894:14181:14394:14659:14721:21080:21433:21444:21451:21627:21990:30054:30064:30070:30090,0,RBL:209.85.221.68:@ffwll.ch:.lbl8.mailshell.net-62.8.0.100 66.201.201.201;04yghs6ur78zsi36sk3y1iwfqd54zoc7eqo7uf5bc6thm9pu9tw1jbet4zkujd9.n4oksd71jerhjgj161i8eotz5s4s3hdeon94wcydjfeep7r37cnczq5bbbxz8j1.y-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:none,Custom_rules:0:0:0,LFtime:23,LUA_SUMMARY:none X-HE-Tag: bulb60_2104bba27247 X-Filterd-Recvd-Size: 5197 Received: from mail-wr1-f68.google.com (mail-wr1-f68.google.com [209.85.221.68]) by imf05.hostedemail.com (Postfix) with ESMTP for ; Wed, 21 Oct 2020 08:57:20 +0000 (UTC) Received: by mail-wr1-f68.google.com with SMTP id t9so2039484wrq.11 for ; Wed, 21 Oct 2020 01:57:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=7XJE+hSH/S5sf+J2AcmYCFMIcTxnQzpOZqEdbmMuzFE=; b=GUK8bAu/rOwhstjfCCL4jyz79EWKlxKCEPzbQk67yqQgL5JdMMK9qYFAwYpDisTw7I i418204vlPkRGtUhsDK0/5TGt4bPzoR91GVgS9OWMA2nj4HmDeVE9XWPk7FPp7l7XoFa ZYmkpZjMTP6Ea3nY9tfKU2e09YncWgauHxbSA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=7XJE+hSH/S5sf+J2AcmYCFMIcTxnQzpOZqEdbmMuzFE=; b=ZR/GnzmlPizTITQf30uBezlCeB1z4h/+7cCVAM1CCT62oW4tdz8WPe9U+2xr5wFitW 0nL96OG1dLnq7/AuE+Rp+lyEVsrpp6Sym4mmf5VrV8ZAIBbnbhRWaUzImP7DKXsyRgGP rOIxhppiuz+9FWc+EaCc47hvwBshMPno3/V1N1fglAbcJEWhkzxTJHJc9MKlggHldYm1 ERpQmWX3ld5fLBH351rlo9P9z02Enn8kGmt9NCssShB8l2L1R0t+4YqwA6pVQgMc6xqy 27/Ok15rMYRU1HWEPjimfjpJhvc9C+Sj89OdhRk9+a0axmMnRh8ZpxDsLd2UHVHsdaUl nChg== X-Gm-Message-State: AOAM533LcojvvSnPA7HXseO+KcbfpWMhWS2JnXBccG+YNGZTfHDnfR/1 oaUsLM35FKx2lw4/xStGf8KatA== X-Google-Smtp-Source: ABdhPJx37Cjmlb4fgq/grqKCCp37y8t5Mz28eOZMNIB2vWtdgu/4b448hmjy5S8hmkcygKAt/hypYw== X-Received: by 2002:a5d:5009:: with SMTP id e9mr3539688wrt.104.1603270640046; Wed, 21 Oct 2020 01:57:20 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id q8sm2675939wro.32.2020.10.21.01.57.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2020 01:57:19 -0700 (PDT) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Vetter , Daniel Vetter , Jason Gunthorpe , Kees Cook , Dan Williams , Andrew Morton , John Hubbard , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Bjorn Helgaas , linux-pci@vger.kernel.org, Daniel Vetter Subject: [PATCH v3 12/16] PCI: Obey iomem restrictions for procfs mmap Date: Wed, 21 Oct 2020 10:56:51 +0200 Message-Id: <20201021085655.1192025-13-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> References: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: There's three ways to access PCI BARs from userspace: /dev/mem, sysfs files, and the old proc interface. Two check against iomem_is_exclusive, proc never did. And with CONFIG_IO_STRICT_DEVMEM, this starts to matter, since we don't want random userspace having access to PCI BARs while a driver is loaded and using it. Fix this by adding the same iomem_is_exclusive() check we already have on the sysfs side in pci_mmap_resource(). References: 90a545e98126 ("restrict /dev/mem to idle io memory ranges") Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Kees Cook Cc: Dan Williams Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: Bjorn Helgaas Cc: linux-pci@vger.kernel.org Signed-off-by: Daniel Vetter --- v2: Improve commit message (Bjorn) --- drivers/pci/proc.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c index d35186b01d98..3a2f90beb4cb 100644 --- a/drivers/pci/proc.c +++ b/drivers/pci/proc.c @@ -274,6 +274,11 @@ static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma) else return -EINVAL; } + + if (dev->resource[i].flags & IORESOURCE_MEM && + iomem_is_exclusive(dev->resource[i].start)) + return -EINVAL; + ret = pci_mmap_page_range(dev, i, vma, fpriv->mmap_state, write_combine); if (ret < 0) From patchwork Wed Oct 21 08:56:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11848633 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 00DB914B4 for ; Wed, 21 Oct 2020 08:57:37 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B251C223C7 for ; Wed, 21 Oct 2020 08:57:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="Q5xIQ5ZZ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B251C223C7 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id E485F6B007D; Wed, 21 Oct 2020 04:57:23 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id D320E6B007E; Wed, 21 Oct 2020 04:57:23 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id BD10A6B0080; Wed, 21 Oct 2020 04:57:23 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0149.hostedemail.com [216.40.44.149]) by kanga.kvack.org (Postfix) with ESMTP id 923EC6B007D for ; Wed, 21 Oct 2020 04:57:23 -0400 (EDT) Received: from smtpin03.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 3C8934DC4 for ; Wed, 21 Oct 2020 08:57:23 +0000 (UTC) X-FDA: 77395328766.03.pump32_0f0b5fc27247 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin03.hostedemail.com (Postfix) with ESMTP id 1714028A4E9 for ; Wed, 21 Oct 2020 08:57:23 +0000 (UTC) X-Spam-Summary: 1,0,0,a9602fa4274ee50f,d41d8cd98f00b204,daniel.vetter@ffwll.ch,,RULES_HIT:41:152:355:379:541:800:960:968:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1534:1541:1593:1594:1711:1730:1747:1777:1792:2393:2553:2559:2562:3138:3139:3140:3141:3142:3352:3865:3866:3867:3868:3870:3871:3872:3874:4321:4401:5007:6261:6653:6742:10004:10400:11658:11914:12043:12297:12517:12519:12555:12895:12986:13069:13311:13357:13846:13894:14096:14097:14181:14394:14659:14721:21080:21444:21451:21627:21990:30054:30064:30089:30090,0,RBL:209.85.221.65:@ffwll.ch:.lbl8.mailshell.net-62.8.0.100 66.201.201.201;04yrm819okphoyzwnz1ruxmbdcncoopj7jadyi5451s4zcdsut3dxmknpfifias.h3kbkhh1854f4ygnisonoc7m48b8pfh73j9y8c4s8wzne5y4pte6tthgtzygsj4.o-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:none,Custom_rules:0:0:0,LFtime:24,LUA_SUMMARY:none X-HE-Tag: pump32_0f0b5fc27247 X-Filterd-Recvd-Size: 4895 Received: from mail-wr1-f65.google.com (mail-wr1-f65.google.com [209.85.221.65]) by imf11.hostedemail.com (Postfix) with ESMTP for ; Wed, 21 Oct 2020 08:57:22 +0000 (UTC) Received: by mail-wr1-f65.google.com with SMTP id b8so2198835wrn.0 for ; Wed, 21 Oct 2020 01:57:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=uPFBW3zdBbgXKQwmFhj6n2htyRlDiIM2JKOjMDR2Svk=; b=Q5xIQ5ZZYYOT58QTfrI5br9Ppx/bLZ105j8P0fIicibYOu5IC1Sg/+iyIB7NDvjNKa v8dXdU35mjbOyyP8u0IJ7eEZ+vL/X1lNG63n9af15UXY4ydu5XizX8BQwljv+vmiyhWM HFmJ5amWKsGB1BdrFdTO0WHgPqyFGMOuvguGg= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=uPFBW3zdBbgXKQwmFhj6n2htyRlDiIM2JKOjMDR2Svk=; b=G7zELITEmvD80ruzZ+5trIyjeWrm+VKuriWBGRs8nFZunuNyM4IT7+gr8S76R8HK7m Pu7VpP/IygEewWMS2EUrXEWOjFvVp/Yo+TPiBNSk1GELWkBpXQOq2HbzXZ/7MbRY6DOy lnZKCXQ84zuokYgNj1TLyI5nqFa6F+ump7CIZ6J+mny/ScdTXOpf9UzvvHc5ejTV/EZw jnRvzcOjv3BLBMHenPoeYn6VI600ZD95fsxWERbvtFXew95qZr0RWFJathxmK2F6Unw8 CupqVc4lEBhdeHoaRMETAfbANzi/hCb0yM05LXpQe5agHwlzfDD+m3JRQy481Q9TqXg1 yN9A== X-Gm-Message-State: AOAM531WEFuM/91WenyS8gnz8q16DRHJwnTMvJt2uw1yL4u+Ck3FccFy sdl1DohuLKxqGiD2zAfUj1Ls6A== X-Google-Smtp-Source: ABdhPJy8GRdMv9VFxpslmlWygSQvuKUEKPEZC0G0JfmHSUQJEjAtWYN/WzAaxZWK8SwF8l2Bb92lIg== X-Received: by 2002:a5d:6a85:: with SMTP id s5mr3550223wru.90.1603270641395; Wed, 21 Oct 2020 01:57:21 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id q8sm2675939wro.32.2020.10.21.01.57.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2020 01:57:20 -0700 (PDT) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Vetter , Daniel Vetter , Jason Gunthorpe , Kees Cook , Dan Williams , Andrew Morton , John Hubbard , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Daniel Vetter Subject: [PATCH v3 13/16] /dev/mem: Only set filp->f_mapping Date: Wed, 21 Oct 2020 10:56:52 +0200 Message-Id: <20201021085655.1192025-14-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> References: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: When we care about pagecache maintenance, we need to make sure that both f_mapping and i_mapping point at the right mapping. But for iomem mappings we only care about the virtual/pte side of things, so f_mapping is enough. Also setting inode->i_mapping was confusing me as a driver maintainer, since in e.g. drivers/gpu we don't do that. Per Dan this seems to be copypasta from places which do care about pagecache consistency, but not needed. Hence remove it for slightly less confusion. Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Kees Cook Cc: Dan Williams Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Signed-off-by: Daniel Vetter Reviewed-by: Dan Williams --- drivers/char/mem.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/char/mem.c b/drivers/char/mem.c index abd4ffdc8cde..5502f56f3655 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -864,7 +864,6 @@ static int open_port(struct inode *inode, struct file *filp) * revocations when drivers want to take over a /dev/mem mapped * range. */ - inode->i_mapping = devmem_inode->i_mapping; filp->f_mapping = inode->i_mapping; return 0; From patchwork Wed Oct 21 08:56:53 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11848637 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id BD2F317EC for ; Wed, 21 Oct 2020 08:57:39 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 62F5022470 for ; Wed, 21 Oct 2020 08:57:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="AP3b3bdk" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 62F5022470 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 5E3896B007E; Wed, 21 Oct 2020 04:57:25 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 51B466B0080; Wed, 21 Oct 2020 04:57:25 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3B9446B0081; Wed, 21 Oct 2020 04:57:25 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0212.hostedemail.com [216.40.44.212]) by kanga.kvack.org (Postfix) with ESMTP id 0E57B6B007E for ; Wed, 21 Oct 2020 04:57:25 -0400 (EDT) Received: from smtpin30.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id A58DC181AC9CC for ; Wed, 21 Oct 2020 08:57:24 +0000 (UTC) X-FDA: 77395328808.30.bite86_4507ab527247 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin30.hostedemail.com (Postfix) with ESMTP id 86A64180B3AA7 for ; Wed, 21 Oct 2020 08:57:24 +0000 (UTC) X-Spam-Summary: 1,0,0,82526572aa8355a5,d41d8cd98f00b204,daniel.vetter@ffwll.ch,,RULES_HIT:1:2:41:69:152:355:379:541:800:960:966:973:982:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1500:1515:1516:1518:1593:1594:1605:1730:1747:1777:1792:2196:2198:2199:2200:2393:2553:2559:2562:2894:2898:3138:3139:3140:3141:3142:3865:3866:3867:3868:3870:3871:3872:3874:4052:4321:4385:4605:5007:6119:6261:6653:6742:7875:7903:8603:9592:9707:10004:11026:11473:11657:11658:11914:12043:12291:12296:12297:12438:12517:12519:12555:12683:12895:12986:13846:13894:14394:14659:21080:21433:21444:21451:21611:21627:21987:21990:30012:30029:30054:30064:30070:30089:30090,0,RBL:209.85.128.67:@ffwll.ch:.lbl8.mailshell.net-62.8.0.100 66.201.201.201;04yfjcidr18iymmoprkra3qxr5767ycu1cjr35s14oapkidfw17yj1bus7d1q98.np9u6cpywb9c7xcm3jpo8rysarwzx3wk6b9bo33jdom3w7owr4q6jnrdxqy9u88.r-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:none,Cust om_rules X-HE-Tag: bite86_4507ab527247 X-Filterd-Recvd-Size: 13009 Received: from mail-wm1-f67.google.com (mail-wm1-f67.google.com [209.85.128.67]) by imf33.hostedemail.com (Postfix) with ESMTP for ; Wed, 21 Oct 2020 08:57:23 +0000 (UTC) Received: by mail-wm1-f67.google.com with SMTP id b127so897550wmb.3 for ; Wed, 21 Oct 2020 01:57:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=aBoKTxegCiMYpxvTLEwc8TlAefYzlvknZWTRI+Ydh8I=; b=AP3b3bdkrID/KzaTVFRe8yBWzxffBpMqEa8a/66Ihilc4X7chTOpPOcej7sCOj+Zmt uzZeTjVCQkjuk94tL2aloAYPRayTO1ekFtKuyvSI6Xc6NufbKHJpmlQtGBsN9hxcDphF /X6xa2Ycv9n8gk1zd9bL3dybzHcth4xgH0H8U= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=aBoKTxegCiMYpxvTLEwc8TlAefYzlvknZWTRI+Ydh8I=; b=dFudccVlrVxFnP2zS3faPNir7t9iqxXS7An0et9MLj3Apg1KxWD6tUOfX8p8WwKAHX 8QT4rEnURDuA69Mo1Q1lqayDwWpA1awupaAQvyE73XO/v+IjyzfUAYTmbRt5QBxf6ahE h7Zj6JddZPsbhLyyQrDz5q/thgJa1r+w96Nn81gwUg+SSq5qDlI7U15fEh67grD0D0qX y5Kvi2F/O4HHfZnCVvcKCuJIbZQnwNZdfFa6htizqJAd1NRd3CGEhH89sVXQ4RguohD5 MXT+F4Xnym8SZaXSTA8F7tCc/iytKakrgHSLo73G5MZ8Cy9tm4O82dyERNT1yIQ+dk4P tfMA== X-Gm-Message-State: AOAM533RF47jlEYxYfbjBDciw74JPfx3vApEvoPjPc6VaRcXnhCObXy9 nxN5439L+JXA1tcYXzgwnYYJFg== X-Google-Smtp-Source: ABdhPJwf3DZZ9c6oKZg142+XtjY48SrUmrnpyP2WRRwtm3wxB8XXhaXev63lW8+C3ftX+U8SPjKoUQ== X-Received: by 2002:a1c:3103:: with SMTP id x3mr2427324wmx.107.1603270642920; Wed, 21 Oct 2020 01:57:22 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id q8sm2675939wro.32.2020.10.21.01.57.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2020 01:57:22 -0700 (PDT) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Vetter , Greg Kroah-Hartman , Daniel Vetter , Jason Gunthorpe , Kees Cook , Dan Williams , Andrew Morton , John Hubbard , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Arnd Bergmann , David Hildenbrand , "Rafael J. Wysocki" , Daniel Vetter Subject: [PATCH v3 14/16] resource: Move devmem revoke code to resource framework Date: Wed, 21 Oct 2020 10:56:53 +0200 Message-Id: <20201021085655.1192025-15-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> References: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: We want all iomem mmaps to consistently revoke ptes when the kernel takes over and CONFIG_IO_STRICT_DEVMEM is enabled. This includes the pci bar mmaps available through procfs and sysfs, which currently do not revoke mappings. To prepare for this, move the code from the /dev/kmem driver to kernel/resource.c. Reviewed-by: Greg Kroah-Hartman Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Kees Cook Cc: Dan Williams Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: Arnd Bergmann Cc: Greg Kroah-Hartman Cc: Daniel Vetter Cc: David Hildenbrand Cc: "Rafael J. Wysocki" Signed-off-by: Daniel Vetter Reviewed-by: Dan Williams --- v3: - add barrier for consistency and document why we don't have to check for NULL (Jason) --- drivers/char/mem.c | 85 +--------------------------------- include/linux/ioport.h | 6 +-- kernel/resource.c | 101 ++++++++++++++++++++++++++++++++++++++++- 3 files changed, 102 insertions(+), 90 deletions(-) diff --git a/drivers/char/mem.c b/drivers/char/mem.c index 5502f56f3655..53338aad8d28 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -31,9 +31,6 @@ #include #include #include -#include -#include -#include #ifdef CONFIG_IA64 # include @@ -809,42 +806,6 @@ static loff_t memory_lseek(struct file *file, loff_t offset, int orig) return ret; } -static struct inode *devmem_inode; - -#ifdef CONFIG_IO_STRICT_DEVMEM -void revoke_devmem(struct resource *res) -{ - /* pairs with smp_store_release() in devmem_init_inode() */ - struct inode *inode = smp_load_acquire(&devmem_inode); - - /* - * Check that the initialization has completed. Losing the race - * is ok because it means drivers are claiming resources before - * the fs_initcall level of init and prevent /dev/mem from - * establishing mappings. - */ - if (!inode) - return; - - /* - * The expectation is that the driver has successfully marked - * the resource busy by this point, so devmem_is_allowed() - * should start returning false, however for performance this - * does not iterate the entire resource range. - */ - if (devmem_is_allowed(PHYS_PFN(res->start)) && - devmem_is_allowed(PHYS_PFN(res->end))) { - /* - * *cringe* iomem=relaxed says "go ahead, what's the - * worst that can happen?" - */ - return; - } - - unmap_mapping_range(inode->i_mapping, res->start, resource_size(res), 1); -} -#endif - static int open_port(struct inode *inode, struct file *filp) { int rc; @@ -864,7 +825,7 @@ static int open_port(struct inode *inode, struct file *filp) * revocations when drivers want to take over a /dev/mem mapped * range. */ - filp->f_mapping = inode->i_mapping; + filp->f_mapping = iomem_get_mapping(); return 0; } @@ -995,48 +956,6 @@ static char *mem_devnode(struct device *dev, umode_t *mode) static struct class *mem_class; -static int devmem_fs_init_fs_context(struct fs_context *fc) -{ - return init_pseudo(fc, DEVMEM_MAGIC) ? 0 : -ENOMEM; -} - -static struct file_system_type devmem_fs_type = { - .name = "devmem", - .owner = THIS_MODULE, - .init_fs_context = devmem_fs_init_fs_context, - .kill_sb = kill_anon_super, -}; - -static int devmem_init_inode(void) -{ - static struct vfsmount *devmem_vfs_mount; - static int devmem_fs_cnt; - struct inode *inode; - int rc; - - rc = simple_pin_fs(&devmem_fs_type, &devmem_vfs_mount, &devmem_fs_cnt); - if (rc < 0) { - pr_err("Cannot mount /dev/mem pseudo filesystem: %d\n", rc); - return rc; - } - - inode = alloc_anon_inode(devmem_vfs_mount->mnt_sb); - if (IS_ERR(inode)) { - rc = PTR_ERR(inode); - pr_err("Cannot allocate inode for /dev/mem: %d\n", rc); - simple_release_fs(&devmem_vfs_mount, &devmem_fs_cnt); - return rc; - } - - /* - * Publish /dev/mem initialized. - * Pairs with smp_load_acquire() in revoke_devmem(). - */ - smp_store_release(&devmem_inode, inode); - - return 0; -} - static int __init chr_dev_init(void) { int minor; @@ -1058,8 +977,6 @@ static int __init chr_dev_init(void) */ if ((minor == DEVPORT_MINOR) && !arch_has_dev_port()) continue; - if ((minor == DEVMEM_MINOR) && devmem_init_inode() != 0) - continue; device_create(mem_class, NULL, MKDEV(MEM_MAJOR, minor), NULL, devlist[minor].name); diff --git a/include/linux/ioport.h b/include/linux/ioport.h index 6c2b06fe8beb..8ffb61b36606 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -302,11 +302,7 @@ struct resource *devm_request_free_mem_region(struct device *dev, struct resource *request_free_mem_region(struct resource *base, unsigned long size, const char *name); -#ifdef CONFIG_IO_STRICT_DEVMEM -void revoke_devmem(struct resource *res); -#else -static inline void revoke_devmem(struct resource *res) { }; -#endif +extern struct address_space *iomem_get_mapping(void); #endif /* __ASSEMBLY__ */ #endif /* _LINUX_IOPORT_H */ diff --git a/kernel/resource.c b/kernel/resource.c index 841737bbda9e..a92fed5b9997 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -18,12 +18,15 @@ #include #include #include +#include #include #include #include #include #include +#include #include +#include #include @@ -1112,6 +1115,58 @@ resource_size_t resource_alignment(struct resource *res) static DECLARE_WAIT_QUEUE_HEAD(muxed_resource_wait); +static struct inode *iomem_inode; + +#ifdef CONFIG_IO_STRICT_DEVMEM +static void revoke_iomem(struct resource *res) +{ + /* pairs with smp_store_release() in iomem_init_inode() */ + struct inode *inode = smp_load_acquire(&iomem_inode); + + /* + * Check that the initialization has completed. Losing the race + * is ok because it means drivers are claiming resources before + * the fs_initcall level of init and prevent /dev/mem from + * establishing mappings. + */ + if (!inode) + return; + + /* + * The expectation is that the driver has successfully marked + * the resource busy by this point, so devmem_is_allowed() + * should start returning false, however for performance this + * does not iterate the entire resource range. + */ + if (devmem_is_allowed(PHYS_PFN(res->start)) && + devmem_is_allowed(PHYS_PFN(res->end))) { + /* + * *cringe* iomem=relaxed says "go ahead, what's the + * worst that can happen?" + */ + return; + } + + unmap_mapping_range(inode->i_mapping, res->start, resource_size(res), 1); +} +struct address_space *iomem_get_mapping(void) +{ + /* + * This function is only called from file open paths, hence guaranteed + * that fs_initcalls have completed and no need to check for NULL. But + * since revoke_iomem can be called before the initcall we still need + * the barrier to appease checkers. + */ + return smp_load_acquire(&iomem_inode)->i_mapping; +} +#else +static void revoke_iomem(struct resource *res) {} +struct address_space *iomem_get_mapping(void) +{ + return NULL; +} +#endif + /** * __request_region - create a new busy resource region * @parent: parent resource descriptor @@ -1179,7 +1234,7 @@ struct resource * __request_region(struct resource *parent, write_unlock(&resource_lock); if (res && orig_parent == &iomem_resource) - revoke_devmem(res); + revoke_iomem(res); return res; } @@ -1713,4 +1768,48 @@ static int __init strict_iomem(char *str) return 1; } +static int iomem_fs_init_fs_context(struct fs_context *fc) +{ + return init_pseudo(fc, DEVMEM_MAGIC) ? 0 : -ENOMEM; +} + +static struct file_system_type iomem_fs_type = { + .name = "iomem", + .owner = THIS_MODULE, + .init_fs_context = iomem_fs_init_fs_context, + .kill_sb = kill_anon_super, +}; + +static int __init iomem_init_inode(void) +{ + static struct vfsmount *iomem_vfs_mount; + static int iomem_fs_cnt; + struct inode *inode; + int rc; + + rc = simple_pin_fs(&iomem_fs_type, &iomem_vfs_mount, &iomem_fs_cnt); + if (rc < 0) { + pr_err("Cannot mount iomem pseudo filesystem: %d\n", rc); + return rc; + } + + inode = alloc_anon_inode(iomem_vfs_mount->mnt_sb); + if (IS_ERR(inode)) { + rc = PTR_ERR(inode); + pr_err("Cannot allocate inode for iomem: %d\n", rc); + simple_release_fs(&iomem_vfs_mount, &iomem_fs_cnt); + return rc; + } + + /* + * Publish /dev/mem initialized. + * Pairs with smp_load_acquire() in revoke_iomem(). + */ + smp_store_release(&iomem_inode, inode); + + return 0; +} + +fs_initcall(iomem_init_inode); + __setup("iomem=", strict_iomem); From patchwork Wed Oct 21 08:56:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11848651 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6DA4814B4 for ; Wed, 21 Oct 2020 08:57:42 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 1C63F22470 for ; Wed, 21 Oct 2020 08:57:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="EE/91tuK" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1C63F22470 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id CE6976B0080; Wed, 21 Oct 2020 04:57:26 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id C1F7D6B0081; Wed, 21 Oct 2020 04:57:26 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id AE6626B0082; Wed, 21 Oct 2020 04:57:26 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0211.hostedemail.com [216.40.44.211]) by kanga.kvack.org (Postfix) with ESMTP id 828416B0080 for ; Wed, 21 Oct 2020 04:57:26 -0400 (EDT) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 1C757180AD807 for ; Wed, 21 Oct 2020 08:57:26 +0000 (UTC) X-FDA: 77395328892.05.field66_0a162c727247 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin05.hostedemail.com (Postfix) with ESMTP id 0438518028201 for ; Wed, 21 Oct 2020 08:57:25 +0000 (UTC) X-Spam-Summary: 1,0,0,941676ccada7dd33,d41d8cd98f00b204,daniel.vetter@ffwll.ch,,RULES_HIT:41:152:355:379:541:800:960:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1535:1543:1593:1594:1711:1730:1747:1777:1792:2393:2553:2559:2562:2901:3138:3139:3140:3141:3142:3354:3865:3866:3867:3870:3871:3874:4118:4321:4605:5007:6261:6653:6742:6743:7903:8603:10004:10400:10450:10455:11026:11658:11914:12043:12296:12297:12438:12517:12519:12555:12700:12737:12895:12986:13161:13229:13846:13894:14096:14097:14181:14394:14659:14721:19904:19999:21080:21324:21444:21451:21627:21990:30029:30054:30064:30090,0,RBL:209.85.128.67:@ffwll.ch:.lbl8.mailshell.net-66.201.201.201 62.8.0.100;04yf1kwnr8rk9rziy1cs9bco936e5ypwnke1j1qiapge647dwmioek9gikdfbzf.63dnjyqynadyyy9ettdstfpjuozftrn3ss185ekdht5p7h3huxa9mxjeihhftwc.r-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:none,Custom_rules:0:0:0,LFtime:25,LUA_SUMMARY :none X-HE-Tag: field66_0a162c727247 X-Filterd-Recvd-Size: 7141 Received: from mail-wm1-f67.google.com (mail-wm1-f67.google.com [209.85.128.67]) by imf34.hostedemail.com (Postfix) with ESMTP for ; Wed, 21 Oct 2020 08:57:25 +0000 (UTC) Received: by mail-wm1-f67.google.com with SMTP id a72so731284wme.5 for ; Wed, 21 Oct 2020 01:57:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=oQvkweh0coyyHFs1+P/kZMwtZJPPWi3HClx7V6v1fv0=; b=EE/91tuK+LnQ6Bg/BJZHq1+5OAQo6TOscz5wTlYQlFCOdrCXYSUlrYitteOGw9m+LY STU6xM7NhAXVZvMrs/CddxhZ9Ce+pijIkJL18SFd1amKxNAH30F/FyM/bG8C+7+O+j11 /6ubZyozbslsGF1Lvd8CED3xyzh3w0GshGNLU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=oQvkweh0coyyHFs1+P/kZMwtZJPPWi3HClx7V6v1fv0=; b=JOAU9PJM2ZyA1FeZhHC6w6GIv3qC8ImuHHHDDP4ciKt1TSzxvcDKgeYGd2UZhwM0RK GzxIZH2u4W8tpu19yyDAwu2aSu0zC3DrN894cYJhcyi2dZo/KUyUFTKWOYQq1EPw3BzZ foeUXh9J8p1MIKqlAWybWX9C0cbJNGCdvyLmqIgdeC5Xi5mYQPcjtvJ7QmuKind9yY4P 3ZdHYZYEUnrgjQhZj4COCMWCRNS5Izu823dsoXzKaHkq3Sx3pWU7xik4HPbF036dwbkq 2Cs3AQLq1yib1Lq15z3q28YYGmIuHPBRgiOlY80WNpNvx7n2uEHAvkyTp9uM1zC78o02 53Qw== X-Gm-Message-State: AOAM533EzUa25q/4/XNDp8HfAY2sDWCOfOYa3oBO0eUtshrRnj5jZrmV CCfDLp/lql5bwCLlsLM7TQnQOg== X-Google-Smtp-Source: ABdhPJxh5W+195BRlQ75jcVqoxSqHuITL1MkZ8kYhnwY/3GuozWB13g2bfVDwEcl3AUtRbmZy3j2Zw== X-Received: by 2002:a1c:e089:: with SMTP id x131mr2512477wmg.78.1603270644597; Wed, 21 Oct 2020 01:57:24 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id q8sm2675939wro.32.2020.10.21.01.57.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2020 01:57:23 -0700 (PDT) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Vetter , Greg Kroah-Hartman , Daniel Vetter , Jason Gunthorpe , Kees Cook , Dan Williams , Andrew Morton , John Hubbard , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Bjorn Helgaas , linux-pci@vger.kernel.org, "Rafael J. Wysocki" , Christian Brauner , "David S. Miller" , Michael Ellerman , Sourabh Jain , Mauro Carvalho Chehab , Nayna Jain , Daniel Vetter Subject: [PATCH v3 15/16] sysfs: Support zapping of binary attr mmaps Date: Wed, 21 Oct 2020 10:56:54 +0200 Message-Id: <20201021085655.1192025-16-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> References: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: We want to be able to revoke pci mmaps so that the same access rules applies as for /dev/kmem. Revoke support for devmem was added in 3234ac664a87 ("/dev/mem: Revoke mappings when a driver claims the region"). The simplest way to achieve this is by having the same filp->f_mapping for all mappings, so that unmap_mapping_range can find them all, no matter through which file they've been created. Since this must be set at open time we need sysfs support for this. Add an optional mapping parameter bin_attr, which is only consulted when there's also an mmap callback, since without mmap support allowing to adjust the ->f_mapping makes no sense. Reviewed-by: Greg Kroah-Hartman Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Kees Cook Cc: Dan Williams Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: Bjorn Helgaas Cc: linux-pci@vger.kernel.org Cc: Greg Kroah-Hartman Cc: "Rafael J. Wysocki" Cc: Christian Brauner Cc: "David S. Miller" Cc: Michael Ellerman Cc: Sourabh Jain Cc: Daniel Vetter Cc: Mauro Carvalho Chehab Cc: Nayna Jain Signed-off-by: Daniel Vetter --- fs/sysfs/file.c | 11 +++++++++++ include/linux/sysfs.h | 2 ++ 2 files changed, 13 insertions(+) diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c index eb6897ab78e7..9d8ccdb000e3 100644 --- a/fs/sysfs/file.c +++ b/fs/sysfs/file.c @@ -169,6 +169,16 @@ static int sysfs_kf_bin_mmap(struct kernfs_open_file *of, return battr->mmap(of->file, kobj, battr, vma); } +static int sysfs_kf_bin_open(struct kernfs_open_file *of) +{ + struct bin_attribute *battr = of->kn->priv; + + if (battr->mapping) + of->file->f_mapping = battr->mapping; + + return 0; +} + void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr) { struct kernfs_node *kn = kobj->sd, *tmp; @@ -240,6 +250,7 @@ static const struct kernfs_ops sysfs_bin_kfops_mmap = { .read = sysfs_kf_bin_read, .write = sysfs_kf_bin_write, .mmap = sysfs_kf_bin_mmap, + .open = sysfs_kf_bin_open, }; int sysfs_add_file_mode_ns(struct kernfs_node *parent, diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h index 34e84122f635..a17a474d1601 100644 --- a/include/linux/sysfs.h +++ b/include/linux/sysfs.h @@ -164,11 +164,13 @@ __ATTRIBUTE_GROUPS(_name) struct file; struct vm_area_struct; +struct address_space; struct bin_attribute { struct attribute attr; size_t size; void *private; + struct address_space *mapping; ssize_t (*read)(struct file *, struct kobject *, struct bin_attribute *, char *, loff_t, size_t); ssize_t (*write)(struct file *, struct kobject *, struct bin_attribute *, From patchwork Wed Oct 21 08:56:55 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11848655 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1000014B2 for ; Wed, 21 Oct 2020 08:57:45 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B14F3221FC for ; Wed, 21 Oct 2020 08:57:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="D88rd5Jf" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B14F3221FC Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 51A146B0081; Wed, 21 Oct 2020 04:57:28 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 4CC116B0082; Wed, 21 Oct 2020 04:57:28 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3E0266B0083; Wed, 21 Oct 2020 04:57:28 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0125.hostedemail.com [216.40.44.125]) by kanga.kvack.org (Postfix) with ESMTP id 0BDB86B0081 for ; Wed, 21 Oct 2020 04:57:28 -0400 (EDT) Received: from smtpin12.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id A19A082F4F6F for ; Wed, 21 Oct 2020 08:57:27 +0000 (UTC) X-FDA: 77395328934.12.trip28_0008b8427247 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin12.hostedemail.com (Postfix) with ESMTP id 79AE7180188CF for ; Wed, 21 Oct 2020 08:57:27 +0000 (UTC) X-Spam-Summary: 1,0,0,2bdbcb5dd8ac4a21,d41d8cd98f00b204,daniel.vetter@ffwll.ch,,RULES_HIT:41:152:355:379:541:800:960:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1535:1544:1593:1594:1711:1730:1747:1777:1792:1981:2194:2198:2199:2200:2393:2553:2559:2562:2901:2902:3138:3139:3140:3141:3142:3355:3865:3866:3867:3868:3870:3871:3872:3874:4118:4250:4321:4605:5007:6119:6261:6653:6742:7875:7903:7996:8603:10004:11026:11232:11473:11658:11914:12043:12296:12297:12438:12517:12519:12555:12663:12895:13161:13229:13846:13894:14096:14097:14181:14394:14659:14721:21080:21444:21451:21627:21740:21939:21990:30054:30064:30070:30090,0,RBL:209.85.221.66:@ffwll.ch:.lbl8.mailshell.net-62.8.0.100 66.201.201.201;04yfsfwdwqgkqnj8gfrnhzx8aowqxopbp91n9y435qdwm1xa66ftattgxyrpat5.1uh8qixi3fhk814b68jfzu3b4qrz9z3dax7a9frjdh9zaeu8epk1e5zbrwxh1nx.1-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:none,Custom_ru les:0:0: X-HE-Tag: trip28_0008b8427247 X-Filterd-Recvd-Size: 7800 Received: from mail-wr1-f66.google.com (mail-wr1-f66.google.com [209.85.221.66]) by imf01.hostedemail.com (Postfix) with ESMTP for ; Wed, 21 Oct 2020 08:57:26 +0000 (UTC) Received: by mail-wr1-f66.google.com with SMTP id i1so2184319wro.1 for ; Wed, 21 Oct 2020 01:57:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ylZkHmK3aE1VlYRsGRUx3nUrnQWYBOnVeS+ToU4JUCI=; b=D88rd5JfQWap5HZksMfg9cXMMl3QwJVhjS6+VSQvUjjDd24gp69dQjtY144venALwF VsrNY/8fJu7KcREUK2gdnkvUKz4v4CFfNVYD7BE7l4swdssS9MrlGthSCyyUQikNqz1t 3VSJEkLS9OteyMKDcMhL8pGN2qtRl9K89wcCU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ylZkHmK3aE1VlYRsGRUx3nUrnQWYBOnVeS+ToU4JUCI=; b=rtZWKMVulwtM72vAzJuvFbA9Bji+cuXk2wUA3k4MamZHusk0/lKMvp1Zg1bHNFgWCl dlMaO1S8gJcCAN0/bHe8bZdIzlQKwbWW/+W3LT0u5/nsl7HvTUy/KsMvt+2YeKJPMxJL I5Gjuzf1H6l7ramiA7nhTwpR9thfVvHePrQpTUYcmbSGCP+9lbBvDoJnUs9hVSTbUlSh O9zW3aACdDLjHZ+3prjXfwQH7XLwuT2Q3CJmKuQO01oq56KJ1Xcduo7EXynX7MA4SiDe gNkIfUIyRT5qkIeZzD8GoArISd48KVaiRYE8fAo+7Ml0IMevCqq+gTtzVdl1lkpbj55O D8JA== X-Gm-Message-State: AOAM533G8jGMa9o1vHfmAKa5nGZdrvEgSCE6JKB1rVbx483y3k6uPE76 HHIErj4VnJNo7uFLImaF1vlE/H5g0q4H6FKY X-Google-Smtp-Source: ABdhPJyRYpgvahsTCZYVhKWO7YaUqSYEiS71WxybX5MQOWBTVSJxRg21hOuSPVSQTJs5khc2TIcK9w== X-Received: by 2002:adf:f810:: with SMTP id s16mr3280019wrp.424.1603270646012; Wed, 21 Oct 2020 01:57:26 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id q8sm2675939wro.32.2020.10.21.01.57.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2020 01:57:25 -0700 (PDT) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Vetter , Daniel Vetter , Jason Gunthorpe , Kees Cook , Dan Williams , Andrew Morton , John Hubbard , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Greg Kroah-Hartman , Bjorn Helgaas , linux-pci@vger.kernel.org, Daniel Vetter Subject: [PATCH v3 16/16] PCI: Revoke mappings like devmem Date: Wed, 21 Oct 2020 10:56:55 +0200 Message-Id: <20201021085655.1192025-17-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> References: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Since 3234ac664a87 ("/dev/mem: Revoke mappings when a driver claims the region") /dev/kmem zaps ptes when the kernel requests exclusive acccess to an iomem region. And with CONFIG_IO_STRICT_DEVMEM, this is the default for all driver uses. Except there's two more ways to access PCI BARs: sysfs and proc mmap support. Let's plug that hole. For revoke_devmem() to work we need to link our vma into the same address_space, with consistent vma->vm_pgoff. ->pgoff is already adjusted, because that's how (io_)remap_pfn_range works, but for the mapping we need to adjust vma->vm_file->f_mapping. The cleanest way is to adjust this at at ->open time: - for sysfs this is easy, now that binary attributes support this. We just set bin_attr->mapping when mmap is supported - for procfs it's a bit more tricky, since procfs pci access has only one file per device, and access to a specific resources first needs to be set up with some ioctl calls. But mmap is only supported for the same resources as sysfs exposes with mmap support, and otherwise rejected, so we can set the mapping unconditionally at open time without harm. A special consideration is for arch_can_pci_mmap_io() - we need to make sure that the ->f_mapping doesn't alias between ioport and iomem space. There's only 2 ways in-tree to support mmap of ioports: generic pci mmap (ARCH_GENERIC_PCI_MMAP_RESOURCE), and sparc as the single architecture hand-rolling. Both approach support ioport mmap through a special pfn range and not through magic pte attributes. Aliasing is therefore not a problem. The only difference in access checks left is that sysfs PCI mmap does not check for CAP_RAWIO. I'm not really sure whether that should be added or not. Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Kees Cook Cc: Dan Williams Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: Greg Kroah-Hartman Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: Bjorn Helgaas Cc: linux-pci@vger.kernel.org Signed-off-by: Daniel Vetter --- v2: - Totally new approach: Adjust filp->f_mapping at open time. Note that this now works on all architectures, not just those support ARCH_GENERIC_PCI_MMAP_RESOURCE --- drivers/pci/pci-sysfs.c | 4 ++++ drivers/pci/proc.c | 1 + 2 files changed, 5 insertions(+) diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 6d78df981d41..cee38fcb4a86 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -928,6 +928,7 @@ void pci_create_legacy_files(struct pci_bus *b) b->legacy_io->read = pci_read_legacy_io; b->legacy_io->write = pci_write_legacy_io; b->legacy_io->mmap = pci_mmap_legacy_io; + b->legacy_io->mapping = iomem_get_mapping(); pci_adjust_legacy_attr(b, pci_mmap_io); error = device_create_bin_file(&b->dev, b->legacy_io); if (error) @@ -940,6 +941,7 @@ void pci_create_legacy_files(struct pci_bus *b) b->legacy_mem->size = 1024*1024; b->legacy_mem->attr.mode = 0600; b->legacy_mem->mmap = pci_mmap_legacy_mem; + b->legacy_io->mapping = iomem_get_mapping(); pci_adjust_legacy_attr(b, pci_mmap_mem); error = device_create_bin_file(&b->dev, b->legacy_mem); if (error) @@ -1155,6 +1157,8 @@ static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine) res_attr->mmap = pci_mmap_resource_uc; } } + if (res_attr->mmap) + res_attr->mapping = iomem_get_mapping(); res_attr->attr.name = res_attr_name; res_attr->attr.mode = 0600; res_attr->size = pci_resource_len(pdev, num); diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c index 3a2f90beb4cb..9bab07302bbf 100644 --- a/drivers/pci/proc.c +++ b/drivers/pci/proc.c @@ -298,6 +298,7 @@ static int proc_bus_pci_open(struct inode *inode, struct file *file) fpriv->write_combine = 0; file->private_data = fpriv; + file->f_mapping = iomem_get_mapping(); return 0; }