From patchwork Fri Aug 19 11:08:48 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Danilo Krummrich X-Patchwork-Id: 12948732 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E3F19C32771 for ; Fri, 19 Aug 2022 11:09:15 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id BB17010E9A4; Fri, 19 Aug 2022 11:09:11 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by gabe.freedesktop.org (Postfix) with ESMTPS id 9E0E810E8F4 for ; Fri, 19 Aug 2022 11:09:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1660907339; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=jFR3xFdwN9i2Cd3/9jTqWPHspBtbjbbUfilDsWbGEig=; b=WXz9kTC1VRyNaG9NvV1DnzSqezrZi+TBzw55DbavfgcOCLGM9cwcbpwYgISaLKiV1xgT07 PoT5CFdbn2u0X0ds458da3eVnSehV/7wqszlJ28BsUPw8HNg/FP1RO714aQiwrutwBFy+i nfQP/tKoScLb4LngAfsU6HD3EXlJS78= Received: from mail-ed1-f72.google.com (mail-ed1-f72.google.com [209.85.208.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_128_GCM_SHA256) id us-mta-43-zTxC5tyIOw2CmH5RVO8kIQ-1; Fri, 19 Aug 2022 07:08:58 -0400 X-MC-Unique: zTxC5tyIOw2CmH5RVO8kIQ-1 Received: by mail-ed1-f72.google.com with SMTP id z6-20020a05640240c600b0043e1d52fd98so2684558edb.22 for ; Fri, 19 Aug 2022 04:08:58 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc; bh=jFR3xFdwN9i2Cd3/9jTqWPHspBtbjbbUfilDsWbGEig=; b=Os6YDdvtpL8NI73Xp1Y4lM3Q1XB+7KgothWMtlShPiDQ2qY0I32RF1bvecSVCyOM0s 27NCILPQXhECdvm52y1lX9+sWcjU1xQqYwK72EVkguT1SLu94/7Y62GlVvPQvqxJ0bNT o0UrdawfLeSP0yJ+Z7akGBdYLnDtQAI7C4OobUbRPwuM099c7HXtk3VgxqcL9oW4ULFx rA4ggYYbqCIWpgO8pbpdIpmHOawFyX+8o7HPVXCxY/FcRH86UC938Av8Ezf5Axo9bfFF fbCNJ5vVfkt4Lp5IaHxY2NvEYWzYcwJu+oURM2SxVnUXXTxug8EzFTjPIWKIuPif8Rub uUMg== X-Gm-Message-State: ACgBeo1S7zzPDWJO4EeFlY2XhwGWl5EvkDtw/HORhMTdspYYYOxSNKGL vh1gGguvaoaBy7graA8A3sPXOaKXU+jw317VxF974q+9CA0L0odgOBkzJzRFFm6NrC+JcF/gDAT oLlG6q2PHjC5A6DNRpu/sBiKPBD/N X-Received: by 2002:a05:6402:496:b0:443:a5f5:d3b with SMTP id k22-20020a056402049600b00443a5f50d3bmr5841561edv.331.1660907337410; Fri, 19 Aug 2022 04:08:57 -0700 (PDT) X-Google-Smtp-Source: AA6agR4S7vK3sAEYZ/N6o0dg6PHuk/70e8T70gYOtV0g+o5w19DGgJIB+Ww/rSrXeaZs3FvLKkdEBg== X-Received: by 2002:a05:6402:496:b0:443:a5f5:d3b with SMTP id k22-20020a056402049600b00443a5f50d3bmr5841545edv.331.1660907337216; Fri, 19 Aug 2022 04:08:57 -0700 (PDT) Received: from pollux.redhat.com ([2a02:810d:4b40:2ee8:642:1aff:fe31:a15c]) by smtp.gmail.com with ESMTPSA id l17-20020a1709060cd100b007308fab3eb7sm2167827ejh.195.2022.08.19.04.08.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 Aug 2022 04:08:56 -0700 (PDT) From: Danilo Krummrich To: daniel@ffwll.ch, airlied@linux.ie, tzimmermann@suse.de, mripard@kernel.org Subject: [PATCH drm-misc-next v2 3/4] drm/vc4: crtc: protect device resources after removal Date: Fri, 19 Aug 2022 13:08:48 +0200 Message-Id: <20220819110849.192037-4-dakr@redhat.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220819110849.192037-1-dakr@redhat.com> References: <20220819110849.192037-1-dakr@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Danilo Krummrich , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" (Hardware) resources which are bound to the driver and device lifecycle must not be accessed after the device and driver are unbound. However, the DRM device isn't freed as long as the last user closed it, hence userspace can still call into the driver. Therefore protect the critical sections which are accessing those resources with drm_dev_enter() and drm_dev_exit(). Fixes: 7cc4214c27cf ("drm/vc4: crtc: Switch to drmm_kzalloc") Signed-off-by: Danilo Krummrich --- drivers/gpu/drm/vc4/vc4_crtc.c | 41 +++++++++++++++++++++++++++++++++- 1 file changed, 40 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c index 2def6e2ad6f0..0108613e79d5 100644 --- a/drivers/gpu/drm/vc4/vc4_crtc.c +++ b/drivers/gpu/drm/vc4/vc4_crtc.c @@ -39,6 +39,7 @@ #include #include #include +#include #include #include #include @@ -295,10 +296,17 @@ struct drm_encoder *vc4_get_crtc_encoder(struct drm_crtc *crtc, static void vc4_crtc_pixelvalve_reset(struct drm_crtc *crtc) { struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc); + struct drm_device *dev = crtc->dev; + int idx; + + if (!drm_dev_enter(dev, &idx)) + return; /* The PV needs to be disabled before it can be flushed */ CRTC_WRITE(PV_CONTROL, CRTC_READ(PV_CONTROL) & ~PV_CONTROL_EN); CRTC_WRITE(PV_CONTROL, CRTC_READ(PV_CONTROL) | PV_CONTROL_FIFO_CLR); + + drm_dev_exit(idx); } static void vc4_crtc_config_pv(struct drm_crtc *crtc, struct drm_encoder *encoder, @@ -321,6 +329,10 @@ static void vc4_crtc_config_pv(struct drm_crtc *crtc, struct drm_encoder *encode u32 format = is_dsi1 ? PV_CONTROL_FORMAT_DSIV_24 : PV_CONTROL_FORMAT_24; u8 ppc = pv_data->pixels_per_clock; bool debug_dump_regs = false; + int idx; + + if (!drm_dev_enter(dev, &idx)) + return; if (debug_dump_regs) { struct drm_printer p = drm_info_printer(&vc4_crtc->pdev->dev); @@ -410,6 +422,8 @@ static void vc4_crtc_config_pv(struct drm_crtc *crtc, struct drm_encoder *encode drm_crtc_index(crtc)); drm_print_regset32(&p, &vc4_crtc->regset); } + + drm_dev_exit(idx); } static void require_hvs_enabled(struct drm_device *dev) @@ -430,7 +444,10 @@ static int vc4_crtc_disable(struct drm_crtc *crtc, struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc); struct drm_device *dev = crtc->dev; struct vc4_dev *vc4 = to_vc4_dev(dev); - int ret; + int idx, ret; + + if (!drm_dev_enter(dev, &idx)) + return -ENODEV; CRTC_WRITE(PV_V_CONTROL, CRTC_READ(PV_V_CONTROL) & ~PV_VCONTROL_VIDEN); @@ -464,6 +481,8 @@ static int vc4_crtc_disable(struct drm_crtc *crtc, if (vc4_encoder && vc4_encoder->post_crtc_powerdown) vc4_encoder->post_crtc_powerdown(encoder, state); + drm_dev_exit(idx); + return 0; } @@ -588,10 +607,14 @@ static void vc4_crtc_atomic_enable(struct drm_crtc *crtc, struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc); struct drm_encoder *encoder = vc4_get_crtc_encoder(crtc, new_state); struct vc4_encoder *vc4_encoder = to_vc4_encoder(encoder); + int idx; drm_dbg(dev, "Enabling CRTC %s (%u) connected to Encoder %s (%u)", crtc->name, crtc->base.id, encoder->name, encoder->base.id); + if (!drm_dev_enter(dev, &idx)) + return; + require_hvs_enabled(dev); /* Enable vblank irq handling before crtc is started otherwise @@ -619,6 +642,8 @@ static void vc4_crtc_atomic_enable(struct drm_crtc *crtc, if (vc4_encoder->post_crtc_enable) vc4_encoder->post_crtc_enable(encoder, state); + + drm_dev_exit(idx); } static enum drm_mode_status vc4_crtc_mode_valid(struct drm_crtc *crtc, @@ -711,17 +736,31 @@ static int vc4_crtc_atomic_check(struct drm_crtc *crtc, static int vc4_enable_vblank(struct drm_crtc *crtc) { struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc); + struct drm_device *dev = crtc->dev; + int idx; + + if (!drm_dev_enter(dev, &idx)) + return -ENODEV; CRTC_WRITE(PV_INTEN, PV_INT_VFP_START); + drm_dev_exit(idx); + return 0; } static void vc4_disable_vblank(struct drm_crtc *crtc) { struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc); + struct drm_device *dev = crtc->dev; + int idx; + + if (!drm_dev_enter(dev, &idx)) + return; CRTC_WRITE(PV_INTEN, 0); + + drm_dev_exit(idx); } static void vc4_crtc_handle_page_flip(struct vc4_crtc *vc4_crtc)