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122 lines
4.2 KiB
Diff
122 lines
4.2 KiB
Diff
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From 41a635c959507290ba41afa56ac143d648a69958 Mon Sep 17 00:00:00 2001
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From: Daniel Vetter <daniel.vetter@ffwll.ch>
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Date: Fri, 23 Oct 2020 14:39:23 +0200
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Subject: [PATCH] drm/atomic-helpers: remove legacy_cursor_update hacks
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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The stuff never really worked, and leads to lots of fun because it
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out-of-order frees atomic states. Which upsets KASAN, among other
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things.
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For async updates we now have a more solid solution with the
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->atomic_async_check and ->atomic_async_commit hooks. Support for that
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for msm and vc4 landed. nouveau and i915 have their own commit
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routines, doing something similar.
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For everyone else it's probably better to remove the use-after-free
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bug, and encourage folks to use the async support instead. The
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affected drivers which register a legacy cursor plane and don't either
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use the new async stuff or their own commit routine are: amdgpu,
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atmel, mediatek, qxl, rockchip, sti, sun4i, tegra, virtio, and vmwgfx.
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Inspired by an amdgpu bug report.
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v2: Drop RFC, I think with amdgpu converted over to use
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atomic_async_check/commit done in
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commit 674e78acae0dfb4beb56132e41cbae5b60f7d662
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Author: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
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Date: Wed Dec 5 14:59:07 2018 -0500
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drm/amd/display: Add fast path for cursor plane updates
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we don't have any driver anymore where we have userspace expecting
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solid legacy cursor support _and_ they are using the atomic helpers in
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their fully glory. So we can retire this.
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v3: Paper over msm and i915 regression. The complete_all is the only
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thing missing afaict.
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v4: Rebased on recent kernel, added extra link for vc4 bug.
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Link: https://bugzilla.kernel.org/show_bug.cgi?id=199425
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Link: https://lore.kernel.org/all/20220221134155.125447-9-maxime@cerno.tech/
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Cc: mikita.lipski@amd.com
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Cc: Michel Dänzer <michel@daenzer.net>
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Cc: harry.wentland@amd.com
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Cc: Rob Clark <robdclark@gmail.com>
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Cc: "Kazlauskas, Nicholas" <nicholas.kazlauskas@amd.com>
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Tested-by: Maxime Ripard <maxime@cerno.tech>
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Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
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Signed-off-by: Maxime Ripard <maxime@cerno.tech>
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---
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drivers/gpu/drm/drm_atomic_helper.c | 13 -------------
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drivers/gpu/drm/i915/display/intel_display.c | 13 +++++++++++++
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drivers/gpu/drm/msm/msm_atomic.c | 2 ++
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3 files changed, 15 insertions(+), 13 deletions(-)
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--- a/drivers/gpu/drm/drm_atomic_helper.c
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+++ b/drivers/gpu/drm/drm_atomic_helper.c
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@@ -1488,13 +1488,6 @@ drm_atomic_helper_wait_for_vblanks(struc
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int i, ret;
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unsigned int crtc_mask = 0;
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- /*
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- * Legacy cursor ioctls are completely unsynced, and userspace
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- * relies on that (by doing tons of cursor updates).
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- */
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- if (old_state->legacy_cursor_update)
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- return;
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-
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for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
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if (!new_crtc_state->active)
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continue;
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@@ -2122,12 +2115,6 @@ int drm_atomic_helper_setup_commit(struc
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complete_all(&commit->flip_done);
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continue;
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}
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-
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- /* Legacy cursor updates are fully unsynced. */
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- if (state->legacy_cursor_update) {
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- complete_all(&commit->flip_done);
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- continue;
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- }
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if (!new_crtc_state->event) {
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commit->event = kzalloc(sizeof(*commit->event),
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--- a/drivers/gpu/drm/i915/display/intel_display.c
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+++ b/drivers/gpu/drm/i915/display/intel_display.c
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@@ -10821,6 +10821,19 @@ static int intel_atomic_commit(struct dr
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state->base.legacy_cursor_update = false;
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}
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+ /*
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+ * FIXME: Cut over to (async) commit helpers instead of hand-rolling
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+ * everything.
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+ */
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+ if (state->base.legacy_cursor_update) {
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+ struct intel_crtc_state *new_crtc_state;
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+ struct intel_crtc *crtc;
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+ int i;
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+
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+ for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i)
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+ complete_all(&new_crtc_state->uapi.commit->flip_done);
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+ }
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+
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ret = intel_atomic_prepare_commit(state);
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if (ret) {
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drm_dbg_atomic(&dev_priv->drm,
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--- a/drivers/gpu/drm/msm/msm_atomic.c
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+++ b/drivers/gpu/drm/msm/msm_atomic.c
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@@ -246,6 +246,8 @@ void msm_atomic_commit_tail(struct drm_a
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/* async updates are limited to single-crtc updates: */
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WARN_ON(crtc_mask != drm_crtc_mask(async_crtc));
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+ complete_all(&async_crtc->state->commit->flip_done);
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+
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/*
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* Start timer if we don't already have an update pending
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* on this crtc:
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