From mboxrd@z Thu Jan 1 00:00:00 1970 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 C4403C433EF for ; Thu, 7 Apr 2022 09:33:11 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E788810E791; Thu, 7 Apr 2022 09:33:08 +0000 (UTC) Received: from mail-ej1-x643.google.com (mail-ej1-x643.google.com [IPv6:2a00:1450:4864:20::643]) by gabe.freedesktop.org (Postfix) with ESMTPS id 900F010E940 for ; Thu, 7 Apr 2022 09:33:07 +0000 (UTC) Received: by mail-ej1-x643.google.com with SMTP id i27so9570880ejd.9 for ; Thu, 07 Apr 2022 02:33:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:content-transfer-encoding:in-reply-to; bh=uwBPhONiZYyBxQsXICOALv8GNol1nNujDUXbtPyvO4Y=; b=FeS8VG7rcT0vgPcYmdmbVTEt+oNxS2xxSiVfjx4/xv04CIRIADhIDjbnvMJprbXO9B OfH/Ftved/1Em/25nb6pX8KiHG8LJ+ivR3cKtwFGqMo18QpBCRyDy5+63IhUmi6qeQJI ffvePjaZf4NIHdNy/97Cnfen8EPriNtVv36dI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to; bh=uwBPhONiZYyBxQsXICOALv8GNol1nNujDUXbtPyvO4Y=; b=srvPT9R9RWX/Al2k6G1Tm1xzk+5uy8h3Y06OlIlyVzMxnXbgIQy+ie7Jsa6aQJRHgA eC9xj9mlX1uZp+lb6CuDQdyzn4rl4vP5LqUbPBo9YoQYsCdV3cIvm50GsWhmY27mzOa0 NgS/1BpnK5vhY3vKHgBApRyvzsCerTpSwj9rCy7TbcD5jM6ofN+8BXzEMIEQc5bAOwFo fdDdGh9gDyOZZsuomfTIu47qxtKwenH0ymOjiQ/IWzqkCvkLLgQ/jBUY6kezNtR2puFV S2hULWC85TLToWLFOMdpx7cjsWC5f8mN1u3sU/ooDqTbPbXWHwAws7yC57mQNFZFeyHt ZJdg== X-Gm-Message-State: AOAM532ds8RMJ2zO7hEz8dyMFSSffzSjOffn0bVVqKxxCHr2WBz9NjLK kFG4LfTvJAog+7eiT4A971M7/A== X-Google-Smtp-Source: ABdhPJx4fjbte3+KgCO73L6xmFQquuh3FBYpwNRWAdQy6nnw7R/livNMfAUsxUir2KhzN+L0gK2/Yw== X-Received: by 2002:a17:907:2d89:b0:6df:b7d1:a365 with SMTP id gt9-20020a1709072d8900b006dfb7d1a365mr13308741ejc.386.1649323985990; Thu, 07 Apr 2022 02:33:05 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id q16-20020a170906145000b006bdaf981589sm7414086ejc.81.2022.04.07.02.33.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Apr 2022 02:33:05 -0700 (PDT) Date: Thu, 7 Apr 2022 11:33:03 +0200 From: Daniel Vetter To: Jessica Zhang Subject: Re: [PATCH] drm/atomic-helpers: remove legacy_cursor_update hacks Message-ID: References: <20220331152021.2671937-1-daniel.vetter@ffwll.ch> <823b3f2c-b624-f7a3-8bdc-4c069571c810@quicinc.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <823b3f2c-b624-f7a3-8bdc-4c069571c810@quicinc.com> X-Operating-System: Linux phenom 5.10.0-8-amd64 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: Daniel Vetter , Michel =?iso-8859-1?Q?D=E4nzer?= , DRI Development , Maxime Ripard , Dmitry Osipenko , Daniel Vetter , mikita.lipski@amd.com, Intel Graphics Development , "Kazlauskas, Nicholas" Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Wed, Apr 06, 2022 at 06:27:00PM -0700, Jessica Zhang wrote: > > > On 3/31/2022 8:20 AM, Daniel Vetter wrote: > > The stuff never really worked, and leads to lots of fun because it > > out-of-order frees atomic states. Which upsets KASAN, among other > > things. > > > > For async updates we now have a more solid solution with the > > ->atomic_async_check and ->atomic_async_commit hooks. Support for that > > for msm and vc4 landed. nouveau and i915 have their own commit > > routines, doing something similar. > > > > For everyone else it's probably better to remove the use-after-free > > bug, and encourage folks to use the async support instead. The > > affected drivers which register a legacy cursor plane and don't either > > use the new async stuff or their own commit routine are: amdgpu, > > atmel, mediatek, qxl, rockchip, sti, sun4i, tegra, virtio, and vmwgfx. > > > > Inspired by an amdgpu bug report. > > > > v2: Drop RFC, I think with amdgpu converted over to use > > atomic_async_check/commit done in > > > > commit 674e78acae0dfb4beb56132e41cbae5b60f7d662 > > Author: Nicholas Kazlauskas > > Date: Wed Dec 5 14:59:07 2018 -0500 > > > > drm/amd/display: Add fast path for cursor plane updates > > > > we don't have any driver anymore where we have userspace expecting > > solid legacy cursor support _and_ they are using the atomic helpers in > > their fully glory. So we can retire this. > > > > v3: Paper over msm and i915 regression. The complete_all is the only > > thing missing afaict. > > > > v4: Fixup i915 fixup ... > > > > References: https://bugzilla.kernel.org/show_bug.cgi?id=199425 > > References: https://lore.kernel.org/all/20220221134155.125447-9-maxime@cerno.tech/ > > References: https://bugzilla.kernel.org/show_bug.cgi?id=199425 > > Cc: Maxime Ripard > > Tested-by: Maxime Ripard > > Cc: mikita.lipski@amd.com > > Cc: Michel Dänzer > > Cc: harry.wentland@amd.com > > Cc: Rob Clark > > Hey Rob, > > I saw your tested-by and reviewed-by tags on Patchwork. Just curious, what > device did you test on? > > I'm hitting several instances of this error when doing a start/stop ui on > Lazor Chromebook with this patch: > I'm not familiar with arm splats, what goes boom here? I looked a bit at the code, and I have no idea how I manged to make things explode in there with my patch ... -Daniel > [ 3092.608322] CPU: 2 PID: 18579 Comm: DrmThread Tainted: G W > 5.17.0-rc2-lockdep-00089-g7f17ab7bf567 #155 > e5912cd286513b064a82a38938b3fdef86b079aa > [ 3092.622880] Hardware name: Google Lazor Limozeen without Touchscreen > (rev4) (DT) > [ 3092.630492] pstate: 80400009 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS > BTYPE=--) > [ 3092.637664] pc : dpu_crtc_atomic_flush+0x9c/0x144 > [ 3092.642523] lr : dpu_crtc_atomic_flush+0x60/0x144 > [ 3092.647379] sp : ffffffc00c1e3760 > [ 3092.650805] x29: ffffffc00c1e3760 x28: ffffff80985dd800 x27: > 0000000000000425 > [ 3092.658164] x26: ffffff80985dc500 x25: ffffff80985ddc00 x24: > ffffffdf8ae3b6f0 > [ 3092.665522] x23: 0000000000000000 x22: 0000000000000000 x21: > ffffff809b82da00 > [ 3092.672890] x20: ffffff80840e1000 x19: ffffff80840e2000 x18: > 0000000000001000 > [ 3092.680255] x17: 0000000000000400 x16: 0000000000000100 x15: > 000000000000003b > [ 3092.687622] x14: 0000000000000000 x13: 0000000000000002 x12: > 0000000000000003 > [ 3092.694979] x11: ffffff8084009000 x10: 0000000000000040 x9 : > 0000000000000040 > [ 3092.702340] x8 : 0000000000000300 x7 : 000000000000000c x6 : > 0000000000000004 > [ 3092.709698] x5 : 0000000000000320 x4 : 0000000000000018 x3 : > 0000000000000000 > [ 3092.717056] x2 : 0000000000000000 x1 : 7bfb38b2a3a89800 x0 : > ffffff809a1eb300 > [ 3092.724424] Call trace: > [ 3092.726958] dpu_crtc_atomic_flush+0x9c/0x144 > [ 3092.731463] drm_atomic_helper_commit_planes+0x1bc/0x1c4 > [ 3092.736944] msm_atomic_commit_tail+0x23c/0x3e0 > [ 3092.741627] commit_tail+0x7c/0xfc > [ 3092.745145] drm_atomic_helper_commit+0x158/0x15c > [ 3092.749998] drm_atomic_commit+0x60/0x74 > [ 3092.754055] drm_atomic_helper_update_plane+0x100/0x110 > [ 3092.759449] __setplane_atomic+0x11c/0x120 > [ 3092.763685] drm_mode_cursor_universal+0x188/0x22c > [ 3092.768633] drm_mode_cursor_common+0x120/0x1f8 > [ 3092.773310] drm_mode_cursor_ioctl+0x68/0x8c > [ 3092.777721] drm_ioctl_kernel+0xe8/0x168 > [ 3092.781770] drm_ioctl+0x320/0x370 > [ 3092.785289] drm_compat_ioctl+0x40/0xdc > [ 3092.789257] __arm64_compat_sys_ioctl+0xe0/0x150 > [ 3092.794030] invoke_syscall+0x80/0x114 > [ 3092.797905] el0_svc_common.constprop.3+0xc4/0xf8 > [ 3092.802765] do_el0_svc_compat+0x2c/0x54 > [ 3092.806811] el0_svc_compat+0x4c/0xe4 > [ 3092.810598] el0t_32_sync_handler+0xc4/0xf4 > [ 3092.814914] el0t_32_sync+0x174/0x178 > [ 3092.818701] irq event stamp: 55940 > [ 3092.822217] hardirqs last enabled at (55939): [] > exit_to_kernel_mode+0x10c/0x11c > [ 3092.831523] hardirqs last disabled at (55940): [] > el1_dbg+0x28/0x70 > [ 3092.839577] softirqs last enabled at (55938): [] > __do_softirq+0x1e8/0x480 > [ 3092.848256] softirqs last disabled at (55923): [] > __irq_exit_rcu+0xdc/0x140 > [ 3092.857022] ---[ end trace 0000000000000000 ]--- > > > > > Thanks, > > Jessica Zhang > > > Cc: "Kazlauskas, Nicholas" > > Cc: Dmitry Osipenko > > Signed-off-by: Daniel Vetter > > --- > > drivers/gpu/drm/drm_atomic_helper.c | 13 ------------- > > drivers/gpu/drm/i915/display/intel_display.c | 14 ++++++++++++++ > > drivers/gpu/drm/msm/msm_atomic.c | 2 ++ > > 3 files changed, 16 insertions(+), 13 deletions(-) > > > > diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c > > index 9603193d2fa1..a2899af82b4a 100644 > > --- a/drivers/gpu/drm/drm_atomic_helper.c > > +++ b/drivers/gpu/drm/drm_atomic_helper.c > > @@ -1498,13 +1498,6 @@ drm_atomic_helper_wait_for_vblanks(struct drm_device *dev, > > int i, ret; > > unsigned int crtc_mask = 0; > > - /* > > - * Legacy cursor ioctls are completely unsynced, and userspace > > - * relies on that (by doing tons of cursor updates). > > - */ > > - if (old_state->legacy_cursor_update) > > - return; > > - > > for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) { > > if (!new_crtc_state->active) > > continue; > > @@ -2135,12 +2128,6 @@ int drm_atomic_helper_setup_commit(struct drm_atomic_state *state, > > continue; > > } > > - /* Legacy cursor updates are fully unsynced. */ > > - if (state->legacy_cursor_update) { > > - complete_all(&commit->flip_done); > > - continue; > > - } > > - > > if (!new_crtc_state->event) { > > commit->event = kzalloc(sizeof(*commit->event), > > GFP_KERNEL); > > diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c > > index d2abe0e430bf..6ca5a6e7703b 100644 > > --- a/drivers/gpu/drm/i915/display/intel_display.c > > +++ b/drivers/gpu/drm/i915/display/intel_display.c > > @@ -8799,6 +8799,20 @@ static int intel_atomic_commit(struct drm_device *dev, > > intel_runtime_pm_put(&dev_priv->runtime_pm, state->wakeref); > > return ret; > > } > > + > > + /* > > + * FIXME: Cut over to (async) commit helpers instead of hand-rolling > > + * everything. > > + */ > > + if (state->base.legacy_cursor_update) { > > + struct intel_crtc_state *new_crtc_state; > > + struct intel_crtc *crtc; > > + int i; > > + > > + for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) > > + complete_all(&new_crtc_state->uapi.commit->flip_done); > > + } > > + > > intel_shared_dpll_swap_state(state); > > intel_atomic_track_fbs(state); > > diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c > > index 1686fbb611fd..b3cfabebe5d6 100644 > > --- a/drivers/gpu/drm/msm/msm_atomic.c > > +++ b/drivers/gpu/drm/msm/msm_atomic.c > > @@ -222,6 +222,8 @@ void msm_atomic_commit_tail(struct drm_atomic_state *state) > > /* async updates are limited to single-crtc updates: */ > > WARN_ON(crtc_mask != drm_crtc_mask(async_crtc)); > > + complete_all(&async_crtc->state->commit->flip_done); > > + > > /* > > * Start timer if we don't already have an update pending > > * on this crtc: > > -- > > 2.34.1 > > -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch From mboxrd@z Thu Jan 1 00:00:00 1970 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 F053DC433F5 for ; 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Thu, 07 Apr 2022 02:33:05 -0700 (PDT) Date: Thu, 7 Apr 2022 11:33:03 +0200 From: Daniel Vetter To: Jessica Zhang Message-ID: References: <20220331152021.2671937-1-daniel.vetter@ffwll.ch> <823b3f2c-b624-f7a3-8bdc-4c069571c810@quicinc.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <823b3f2c-b624-f7a3-8bdc-4c069571c810@quicinc.com> X-Operating-System: Linux phenom 5.10.0-8-amd64 Subject: Re: [Intel-gfx] [PATCH] drm/atomic-helpers: remove legacy_cursor_update hacks X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Daniel Vetter , Michel =?iso-8859-1?Q?D=E4nzer?= , DRI Development , Maxime Ripard , Dmitry Osipenko , Daniel Vetter , mikita.lipski@amd.com, Intel Graphics Development , "Kazlauskas, Nicholas" Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Wed, Apr 06, 2022 at 06:27:00PM -0700, Jessica Zhang wrote: > > > On 3/31/2022 8:20 AM, Daniel Vetter wrote: > > The stuff never really worked, and leads to lots of fun because it > > out-of-order frees atomic states. Which upsets KASAN, among other > > things. > > > > For async updates we now have a more solid solution with the > > ->atomic_async_check and ->atomic_async_commit hooks. Support for that > > for msm and vc4 landed. nouveau and i915 have their own commit > > routines, doing something similar. > > > > For everyone else it's probably better to remove the use-after-free > > bug, and encourage folks to use the async support instead. The > > affected drivers which register a legacy cursor plane and don't either > > use the new async stuff or their own commit routine are: amdgpu, > > atmel, mediatek, qxl, rockchip, sti, sun4i, tegra, virtio, and vmwgfx. > > > > Inspired by an amdgpu bug report. > > > > v2: Drop RFC, I think with amdgpu converted over to use > > atomic_async_check/commit done in > > > > commit 674e78acae0dfb4beb56132e41cbae5b60f7d662 > > Author: Nicholas Kazlauskas > > Date: Wed Dec 5 14:59:07 2018 -0500 > > > > drm/amd/display: Add fast path for cursor plane updates > > > > we don't have any driver anymore where we have userspace expecting > > solid legacy cursor support _and_ they are using the atomic helpers in > > their fully glory. So we can retire this. > > > > v3: Paper over msm and i915 regression. The complete_all is the only > > thing missing afaict. > > > > v4: Fixup i915 fixup ... > > > > References: https://bugzilla.kernel.org/show_bug.cgi?id=199425 > > References: https://lore.kernel.org/all/20220221134155.125447-9-maxime@cerno.tech/ > > References: https://bugzilla.kernel.org/show_bug.cgi?id=199425 > > Cc: Maxime Ripard > > Tested-by: Maxime Ripard > > Cc: mikita.lipski@amd.com > > Cc: Michel Dänzer > > Cc: harry.wentland@amd.com > > Cc: Rob Clark > > Hey Rob, > > I saw your tested-by and reviewed-by tags on Patchwork. Just curious, what > device did you test on? > > I'm hitting several instances of this error when doing a start/stop ui on > Lazor Chromebook with this patch: > I'm not familiar with arm splats, what goes boom here? I looked a bit at the code, and I have no idea how I manged to make things explode in there with my patch ... -Daniel > [ 3092.608322] CPU: 2 PID: 18579 Comm: DrmThread Tainted: G W > 5.17.0-rc2-lockdep-00089-g7f17ab7bf567 #155 > e5912cd286513b064a82a38938b3fdef86b079aa > [ 3092.622880] Hardware name: Google Lazor Limozeen without Touchscreen > (rev4) (DT) > [ 3092.630492] pstate: 80400009 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS > BTYPE=--) > [ 3092.637664] pc : dpu_crtc_atomic_flush+0x9c/0x144 > [ 3092.642523] lr : dpu_crtc_atomic_flush+0x60/0x144 > [ 3092.647379] sp : ffffffc00c1e3760 > [ 3092.650805] x29: ffffffc00c1e3760 x28: ffffff80985dd800 x27: > 0000000000000425 > [ 3092.658164] x26: ffffff80985dc500 x25: ffffff80985ddc00 x24: > ffffffdf8ae3b6f0 > [ 3092.665522] x23: 0000000000000000 x22: 0000000000000000 x21: > ffffff809b82da00 > [ 3092.672890] x20: ffffff80840e1000 x19: ffffff80840e2000 x18: > 0000000000001000 > [ 3092.680255] x17: 0000000000000400 x16: 0000000000000100 x15: > 000000000000003b > [ 3092.687622] x14: 0000000000000000 x13: 0000000000000002 x12: > 0000000000000003 > [ 3092.694979] x11: ffffff8084009000 x10: 0000000000000040 x9 : > 0000000000000040 > [ 3092.702340] x8 : 0000000000000300 x7 : 000000000000000c x6 : > 0000000000000004 > [ 3092.709698] x5 : 0000000000000320 x4 : 0000000000000018 x3 : > 0000000000000000 > [ 3092.717056] x2 : 0000000000000000 x1 : 7bfb38b2a3a89800 x0 : > ffffff809a1eb300 > [ 3092.724424] Call trace: > [ 3092.726958] dpu_crtc_atomic_flush+0x9c/0x144 > [ 3092.731463] drm_atomic_helper_commit_planes+0x1bc/0x1c4 > [ 3092.736944] msm_atomic_commit_tail+0x23c/0x3e0 > [ 3092.741627] commit_tail+0x7c/0xfc > [ 3092.745145] drm_atomic_helper_commit+0x158/0x15c > [ 3092.749998] drm_atomic_commit+0x60/0x74 > [ 3092.754055] drm_atomic_helper_update_plane+0x100/0x110 > [ 3092.759449] __setplane_atomic+0x11c/0x120 > [ 3092.763685] drm_mode_cursor_universal+0x188/0x22c > [ 3092.768633] drm_mode_cursor_common+0x120/0x1f8 > [ 3092.773310] drm_mode_cursor_ioctl+0x68/0x8c > [ 3092.777721] drm_ioctl_kernel+0xe8/0x168 > [ 3092.781770] drm_ioctl+0x320/0x370 > [ 3092.785289] drm_compat_ioctl+0x40/0xdc > [ 3092.789257] __arm64_compat_sys_ioctl+0xe0/0x150 > [ 3092.794030] invoke_syscall+0x80/0x114 > [ 3092.797905] el0_svc_common.constprop.3+0xc4/0xf8 > [ 3092.802765] do_el0_svc_compat+0x2c/0x54 > [ 3092.806811] el0_svc_compat+0x4c/0xe4 > [ 3092.810598] el0t_32_sync_handler+0xc4/0xf4 > [ 3092.814914] el0t_32_sync+0x174/0x178 > [ 3092.818701] irq event stamp: 55940 > [ 3092.822217] hardirqs last enabled at (55939): [] > exit_to_kernel_mode+0x10c/0x11c > [ 3092.831523] hardirqs last disabled at (55940): [] > el1_dbg+0x28/0x70 > [ 3092.839577] softirqs last enabled at (55938): [] > __do_softirq+0x1e8/0x480 > [ 3092.848256] softirqs last disabled at (55923): [] > __irq_exit_rcu+0xdc/0x140 > [ 3092.857022] ---[ end trace 0000000000000000 ]--- > > > > > Thanks, > > Jessica Zhang > > > Cc: "Kazlauskas, Nicholas" > > Cc: Dmitry Osipenko > > Signed-off-by: Daniel Vetter > > --- > > drivers/gpu/drm/drm_atomic_helper.c | 13 ------------- > > drivers/gpu/drm/i915/display/intel_display.c | 14 ++++++++++++++ > > drivers/gpu/drm/msm/msm_atomic.c | 2 ++ > > 3 files changed, 16 insertions(+), 13 deletions(-) > > > > diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c > > index 9603193d2fa1..a2899af82b4a 100644 > > --- a/drivers/gpu/drm/drm_atomic_helper.c > > +++ b/drivers/gpu/drm/drm_atomic_helper.c > > @@ -1498,13 +1498,6 @@ drm_atomic_helper_wait_for_vblanks(struct drm_device *dev, > > int i, ret; > > unsigned int crtc_mask = 0; > > - /* > > - * Legacy cursor ioctls are completely unsynced, and userspace > > - * relies on that (by doing tons of cursor updates). > > - */ > > - if (old_state->legacy_cursor_update) > > - return; > > - > > for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) { > > if (!new_crtc_state->active) > > continue; > > @@ -2135,12 +2128,6 @@ int drm_atomic_helper_setup_commit(struct drm_atomic_state *state, > > continue; > > } > > - /* Legacy cursor updates are fully unsynced. */ > > - if (state->legacy_cursor_update) { > > - complete_all(&commit->flip_done); > > - continue; > > - } > > - > > if (!new_crtc_state->event) { > > commit->event = kzalloc(sizeof(*commit->event), > > GFP_KERNEL); > > diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c > > index d2abe0e430bf..6ca5a6e7703b 100644 > > --- a/drivers/gpu/drm/i915/display/intel_display.c > > +++ b/drivers/gpu/drm/i915/display/intel_display.c > > @@ -8799,6 +8799,20 @@ static int intel_atomic_commit(struct drm_device *dev, > > intel_runtime_pm_put(&dev_priv->runtime_pm, state->wakeref); > > return ret; > > } > > + > > + /* > > + * FIXME: Cut over to (async) commit helpers instead of hand-rolling > > + * everything. > > + */ > > + if (state->base.legacy_cursor_update) { > > + struct intel_crtc_state *new_crtc_state; > > + struct intel_crtc *crtc; > > + int i; > > + > > + for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) > > + complete_all(&new_crtc_state->uapi.commit->flip_done); > > + } > > + > > intel_shared_dpll_swap_state(state); > > intel_atomic_track_fbs(state); > > diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c > > index 1686fbb611fd..b3cfabebe5d6 100644 > > --- a/drivers/gpu/drm/msm/msm_atomic.c > > +++ b/drivers/gpu/drm/msm/msm_atomic.c > > @@ -222,6 +222,8 @@ void msm_atomic_commit_tail(struct drm_atomic_state *state) > > /* async updates are limited to single-crtc updates: */ > > WARN_ON(crtc_mask != drm_crtc_mask(async_crtc)); > > + complete_all(&async_crtc->state->commit->flip_done); > > + > > /* > > * Start timer if we don't already have an update pending > > * on this crtc: > > -- > > 2.34.1 > > -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch