From patchwork Fri Oct 1 14:34:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Boris Brezillon X-Patchwork-Id: 12530729 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3926CC433F5 for ; Fri, 1 Oct 2021 14:36:44 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 067D3611AE for ; Fri, 1 Oct 2021 14:36:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 067D3611AE Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=collabora.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=AvXVSF1OHf+yyVNE6nQCIv28c+IwFG6TT24EZPoGflU=; b=K1+wjzxn+rkQoq 4iDjnFcGti1l6VNg6gQPmP5kzI7VgJeSBMxA+Vx1mY79lPzXlM9oyzj+fPcGq1SauCjGrCkgWF0o8 g+V19QfU3VKF5t6qKxr+T+whgO7XDXfVJGLf+OVmajdZk5i3UkD0uBOR36opibMcl/hI1pjtQWQXs Y6ALcboYZPVK9acYM+ye14ZVjub24ozijZbs/yp+E2HucW0J2ksA70S23b4Mh+X8i4HN8Dww+oQQq 0SW9S1iIE0EuXriO4MDf8M7LXEjLtfMpX7iV7KTU49jfpiuVzHIvZmBUzyiu8klpzPqO/Edt5V/G/ MdD8orWhpq9gOEAUWhkw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mWJdJ-000YEp-Fc; Fri, 01 Oct 2021 14:35:29 +0000 Received: from bhuna.collabora.co.uk ([2a00:1098:0:82:1000:25:2eeb:e3e3]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mWJcU-000Xsu-CE for linux-arm-kernel@lists.infradead.org; Fri, 01 Oct 2021 14:34:40 +0000 Received: from localhost.localdomain (unknown [IPv6:2a01:e0a:2c:6930:5cf4:84a1:2763:fe0d]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: bbrezillon) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id 4FEEE1F457AC; Fri, 1 Oct 2021 15:34:35 +0100 (BST) From: Boris Brezillon To: Joerg Roedel , iommu@lists.linux-foundation.org, Rob Herring , Tomeu Vizoso , Alyssa Rosenzweig , Steven Price , Robin Murphy , Will Deacon , linux-arm-kernel@lists.infradead.org Cc: dri-devel@lists.freedesktop.org, Boris Brezillon Subject: [PATCH v2 3/5] drm/panfrost: Add PANFROST_BO_NO{READ,WRITE} flags Date: Fri, 1 Oct 2021 16:34:25 +0200 Message-Id: <20211001143427.1564786-4-boris.brezillon@collabora.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211001143427.1564786-1-boris.brezillon@collabora.com> References: <20211001143427.1564786-1-boris.brezillon@collabora.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211001_073438_586117_25C1CEEA X-CRM114-Status: GOOD ( 16.27 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org So we can create GPU mappings without R/W permissions. Particularly useful to debug corruptions caused by out-of-bound writes. Signed-off-by: Boris Brezillon Reviewed-by: Alyssa Rosenzweig Reviewed-by: Steven Price --- drivers/gpu/drm/panfrost/panfrost_drv.c | 11 ++++++++++- drivers/gpu/drm/panfrost/panfrost_gem.c | 2 ++ drivers/gpu/drm/panfrost/panfrost_gem.h | 2 ++ drivers/gpu/drm/panfrost/panfrost_mmu.c | 8 +++++++- include/uapi/drm/panfrost_drm.h | 2 ++ 5 files changed, 23 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c index 82ad9a67f251..b29ac942ae2d 100644 --- a/drivers/gpu/drm/panfrost/panfrost_drv.c +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c @@ -75,6 +75,10 @@ static int panfrost_ioctl_get_param(struct drm_device *ddev, void *data, struct return 0; } +#define PANFROST_BO_FLAGS \ + (PANFROST_BO_NOEXEC | PANFROST_BO_HEAP | \ + PANFROST_BO_NOREAD | PANFROST_BO_NOWRITE) + static int panfrost_ioctl_create_bo(struct drm_device *dev, void *data, struct drm_file *file) { @@ -84,7 +88,7 @@ static int panfrost_ioctl_create_bo(struct drm_device *dev, void *data, struct panfrost_gem_mapping *mapping; if (!args->size || args->pad || - (args->flags & ~(PANFROST_BO_NOEXEC | PANFROST_BO_HEAP))) + (args->flags & ~PANFROST_BO_FLAGS)) return -EINVAL; /* Heaps should never be executable */ @@ -92,6 +96,11 @@ static int panfrost_ioctl_create_bo(struct drm_device *dev, void *data, !(args->flags & PANFROST_BO_NOEXEC)) return -EINVAL; + /* Executable implies readable */ + if ((args->flags & PANFROST_BO_NOREAD) && + !(args->flags & PANFROST_BO_NOEXEC)) + return -EINVAL; + bo = panfrost_gem_create_with_handle(file, dev, args->size, args->flags, &args->handle); if (IS_ERR(bo)) diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.c b/drivers/gpu/drm/panfrost/panfrost_gem.c index 23377481f4e3..d6c1bb1445f2 100644 --- a/drivers/gpu/drm/panfrost/panfrost_gem.c +++ b/drivers/gpu/drm/panfrost/panfrost_gem.c @@ -251,6 +251,8 @@ panfrost_gem_create_with_handle(struct drm_file *file_priv, bo = to_panfrost_bo(&shmem->base); bo->noexec = !!(flags & PANFROST_BO_NOEXEC); + bo->noread = !!(flags & PANFROST_BO_NOREAD); + bo->nowrite = !!(flags & PANFROST_BO_NOWRITE); bo->is_heap = !!(flags & PANFROST_BO_HEAP); /* diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.h b/drivers/gpu/drm/panfrost/panfrost_gem.h index 8088d5fd8480..6246b5fef446 100644 --- a/drivers/gpu/drm/panfrost/panfrost_gem.h +++ b/drivers/gpu/drm/panfrost/panfrost_gem.h @@ -37,6 +37,8 @@ struct panfrost_gem_object { atomic_t gpu_usecount; bool noexec :1; + bool noread :1; + bool nowrite :1; bool is_heap :1; }; diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c index f51d3f791a17..6a5c9d94d6f2 100644 --- a/drivers/gpu/drm/panfrost/panfrost_mmu.c +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c @@ -307,7 +307,7 @@ int panfrost_mmu_map(struct panfrost_gem_mapping *mapping) struct drm_gem_object *obj = &bo->base.base; struct panfrost_device *pfdev = to_panfrost_device(obj->dev); struct sg_table *sgt; - int prot = IOMMU_READ | IOMMU_WRITE; + int prot = 0; if (WARN_ON(mapping->active)) return 0; @@ -315,6 +315,12 @@ int panfrost_mmu_map(struct panfrost_gem_mapping *mapping) if (bo->noexec) prot |= IOMMU_NOEXEC; + if (!bo->nowrite) + prot |= IOMMU_WRITE; + + if (!bo->noread) + prot |= IOMMU_READ; + sgt = drm_gem_shmem_get_pages_sgt(obj); if (WARN_ON(IS_ERR(sgt))) return PTR_ERR(sgt); diff --git a/include/uapi/drm/panfrost_drm.h b/include/uapi/drm/panfrost_drm.h index 061e700dd06c..a2de81225125 100644 --- a/include/uapi/drm/panfrost_drm.h +++ b/include/uapi/drm/panfrost_drm.h @@ -86,6 +86,8 @@ struct drm_panfrost_wait_bo { #define PANFROST_BO_NOEXEC 1 #define PANFROST_BO_HEAP 2 +#define PANFROST_BO_NOREAD 4 +#define PANFROST_BO_NOWRITE 8 /** * struct drm_panfrost_create_bo - ioctl argument for creating Panfrost BOs.