The patch below does not apply to the 4.7-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From dfa2997055659b4e706a85fba481050cc7e7ad82 Mon Sep 17 00:00:00 2001
From: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Date: Fri, 5 Aug 2016 23:28:27 +0300
Subject: [PATCH] drm/i915: Fix modeset handling during gpu reset, v5.
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
This function would call drm_modeset_lock_all, while the suspend/resume
functions already have their own locking. Fix this by factoring out
__intel_display_resume, and calling the atomic helpers for duplicating
atomic state and disabling all crtc's during suspend.
Changes since v1:
- Deal with -EDEADLK right after lock_all and clean up calls
to hw readout.
- Always take all modeset locks so updates during gpu reset are blocked.
Changes since v2:
- Fix deadlock in intel_update_primary_planes.
- Move WARN_ON(EDEADLK) to __intel_display_resume.
- pctx -> ctx
- only call __intel_display_resume on success in intel_display_resume.
Changes since v3:
- Rebase on top of dev_priv -> dev change.
- Use drm_modeset_lock_all_ctx instead of drm_modeset_lock_all.
Changes since v4 [by vsyrjala]:
- Deal with skip_intermediate_wm
- Update comment w.r.t. mode_config.mutex vs. ->detect()
- Rebase due to INTEL_GEN() etc.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Fixes: e2c8b8701e2d ("drm/i915: Use atomic helpers for suspend, v2.")
Cc: stable@xxxxxxxxxxxxxxx
Tested-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Link: http://patchwork.freedesktop.org/patch/msgid/1470428910-12125-2-git-send-email-ville.syrjala@xxxxxxxxxxxxxxx
(cherry picked from commit 739748939974791b84629a8790527a16f76873a4)
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 21f939074abc..20fe9d52e256 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1854,6 +1854,7 @@ struct drm_i915_private {
enum modeset_restore modeset_restore;
struct mutex modeset_restore_lock;
struct drm_atomic_state *modeset_restore_state;
+ struct drm_modeset_acquire_ctx reset_ctx;
struct list_head vm_list; /* Global list of all address spaces */
struct i915_ggtt ggtt; /* VM representing the global address space */
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index c457eed76f1f..fbb8574fef66 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3093,40 +3093,110 @@ static void intel_update_primary_planes(struct drm_device *dev)
for_each_crtc(dev, crtc) {
struct intel_plane *plane = to_intel_plane(crtc->primary);
- struct intel_plane_state *plane_state;
-
- drm_modeset_lock_crtc(crtc, &plane->base);
- plane_state = to_intel_plane_state(plane->base.state);
+ struct intel_plane_state *plane_state =
+ to_intel_plane_state(plane->base.state);
if (plane_state->visible)
plane->update_plane(&plane->base,
to_intel_crtc_state(crtc->state),
plane_state);
+ }
+}
+
+static int
+__intel_display_resume(struct drm_device *dev,
+ struct drm_atomic_state *state)
+{
+ struct drm_crtc_state *crtc_state;
+ struct drm_crtc *crtc;
+ int i, ret;
+
+ intel_modeset_setup_hw_state(dev);
+ i915_redisable_vga(dev);
- drm_modeset_unlock_crtc(crtc);
+ if (!state)
+ return 0;
+
+ for_each_crtc_in_state(state, crtc, crtc_state, i) {
+ /*
+ * Force recalculation even if we restore
+ * current state. With fast modeset this may not result
+ * in a modeset when the state is compatible.
+ */
+ crtc_state->mode_changed = true;
}
+
+ /* ignore any reset values/BIOS leftovers in the WM registers */
+ to_intel_atomic_state(state)->skip_intermediate_wm = true;
+
+ ret = drm_atomic_commit(state);
+
+ WARN_ON(ret == -EDEADLK);
+ return ret;
}
void intel_prepare_reset(struct drm_i915_private *dev_priv)
{
+ struct drm_device *dev = &dev_priv->drm;
+ struct drm_modeset_acquire_ctx *ctx = &dev_priv->reset_ctx;
+ struct drm_atomic_state *state;
+ int ret;
+
/* no reset support for gen2 */
if (IS_GEN2(dev_priv))
return;
- /* reset doesn't touch the display */
+ /*
+ * Need mode_config.mutex so that we don't
+ * trample ongoing ->detect() and whatnot.
+ */
+ mutex_lock(&dev->mode_config.mutex);
+ drm_modeset_acquire_init(ctx, 0);
+ while (1) {
+ ret = drm_modeset_lock_all_ctx(dev, ctx);
+ if (ret != -EDEADLK)
+ break;
+
+ drm_modeset_backoff(ctx);
+ }
+
+ /* reset doesn't touch the display, but flips might get nuked anyway, */
if (INTEL_GEN(dev_priv) >= 5 || IS_G4X(dev_priv))
return;
- drm_modeset_lock_all(&dev_priv->drm);
/*
* Disabling the crtcs gracefully seems nicer. Also the
* g33 docs say we should at least disable all the planes.
*/
- intel_display_suspend(&dev_priv->drm);
+ state = drm_atomic_helper_duplicate_state(dev, ctx);
+ if (IS_ERR(state)) {
+ ret = PTR_ERR(state);
+ state = NULL;
+ DRM_ERROR("Duplicating state failed with %i\n", ret);
+ goto err;
+ }
+
+ ret = drm_atomic_helper_disable_all(dev, ctx);
+ if (ret) {
+ DRM_ERROR("Suspending crtc's failed with %i\n", ret);
+ goto err;
+ }
+
+ dev_priv->modeset_restore_state = state;
+ state->acquire_ctx = ctx;
+ return;
+
+err:
+ drm_atomic_state_free(state);
}
void intel_finish_reset(struct drm_i915_private *dev_priv)
{
+ struct drm_device *dev = &dev_priv->drm;
+ struct drm_modeset_acquire_ctx *ctx = &dev_priv->reset_ctx;
+ struct drm_atomic_state *state = dev_priv->modeset_restore_state;
+ int ret;
+
/*
* Flips in the rings will be nuked by the reset,
* so complete all pending flips so that user space
@@ -3138,6 +3208,8 @@ void intel_finish_reset(struct drm_i915_private *dev_priv)
if (IS_GEN2(dev_priv))
return;
+ dev_priv->modeset_restore_state = NULL;
+
/* reset doesn't touch the display */
if (INTEL_GEN(dev_priv) >= 5 || IS_G4X(dev_priv)) {
/*
@@ -3149,29 +3221,32 @@ void intel_finish_reset(struct drm_i915_private *dev_priv)
* FIXME: Atomic will make this obsolete since we won't schedule
* CS-based flips (which might get lost in gpu resets) any more.
*/
- intel_update_primary_planes(&dev_priv->drm);
- return;
- }
-
- /*
- * The display has been reset as well,
- * so need a full re-initialization.
- */
- intel_runtime_pm_disable_interrupts(dev_priv);
- intel_runtime_pm_enable_interrupts(dev_priv);
+ intel_update_primary_planes(dev);
+ } else {
+ /*
+ * The display has been reset as well,
+ * so need a full re-initialization.
+ */
+ intel_runtime_pm_disable_interrupts(dev_priv);
+ intel_runtime_pm_enable_interrupts(dev_priv);
- intel_modeset_init_hw(&dev_priv->drm);
+ intel_modeset_init_hw(dev);
- spin_lock_irq(&dev_priv->irq_lock);
- if (dev_priv->display.hpd_irq_setup)
- dev_priv->display.hpd_irq_setup(dev_priv);
- spin_unlock_irq(&dev_priv->irq_lock);
+ spin_lock_irq(&dev_priv->irq_lock);
+ if (dev_priv->display.hpd_irq_setup)
+ dev_priv->display.hpd_irq_setup(dev_priv);
+ spin_unlock_irq(&dev_priv->irq_lock);
- intel_display_resume(&dev_priv->drm);
+ ret = __intel_display_resume(dev, state);
+ if (ret)
+ DRM_ERROR("Restoring old state failed with %i\n", ret);
- intel_hpd_init(dev_priv);
+ intel_hpd_init(dev_priv);
+ }
- drm_modeset_unlock_all(&dev_priv->drm);
+ drm_modeset_drop_locks(ctx);
+ drm_modeset_acquire_fini(ctx);
+ mutex_unlock(&dev->mode_config.mutex);
}
static bool intel_crtc_has_pending_flip(struct drm_crtc *crtc)
@@ -16174,9 +16249,10 @@ void intel_display_resume(struct drm_device *dev)
struct drm_atomic_state *state = dev_priv->modeset_restore_state;
struct drm_modeset_acquire_ctx ctx;
int ret;
- bool setup = false;
dev_priv->modeset_restore_state = NULL;
+ if (state)
+ state->acquire_ctx = &ctx;
/*
* This is a cludge because with real atomic modeset mode_config.mutex
@@ -16187,43 +16263,17 @@ void intel_display_resume(struct drm_device *dev)
mutex_lock(&dev->mode_config.mutex);
drm_modeset_acquire_init(&ctx, 0);
-retry:
- ret = drm_modeset_lock_all_ctx(dev, &ctx);
-
- if (ret == 0 && !setup) {
- setup = true;
-
- intel_modeset_setup_hw_state(dev);
- i915_redisable_vga(dev);
- }
-
- if (ret == 0 && state) {
- struct drm_crtc_state *crtc_state;
- struct drm_crtc *crtc;
- int i;
-
- state->acquire_ctx = &ctx;
-
- /* ignore any reset values/BIOS leftovers in the WM registers */
- to_intel_atomic_state(state)->skip_intermediate_wm = true;
-
- for_each_crtc_in_state(state, crtc, crtc_state, i) {
- /*
- * Force recalculation even if we restore
- * current state. With fast modeset this may not result
- * in a modeset when the state is compatible.
- */
- crtc_state->mode_changed = true;
- }
-
- ret = drm_atomic_commit(state);
- }
+ while (1) {
+ ret = drm_modeset_lock_all_ctx(dev, &ctx);
+ if (ret != -EDEADLK)
+ break;
- if (ret == -EDEADLK) {
drm_modeset_backoff(&ctx);
- goto retry;
}
+ if (!ret)
+ ret = __intel_display_resume(dev, state);
+
drm_modeset_drop_locks(&ctx);
drm_modeset_acquire_fini(&ctx);
mutex_unlock(&dev->mode_config.mutex);
--
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