[Intel-gfx] [PATCH v3 1/2] drm/i915: Fix modeset handling during gpu reset, v3.
Maarten Lankhorst
maarten.lankhorst at linux.intel.com
Mon May 9 11:04:21 UTC 2016
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.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Fixes: e2c8b8701e2d ("drm/i915: Use atomic helpers for suspend, v2.")
Cc: drm-intel-fixes at lists.freedesktop.org
---
drivers/gpu/drm/i915/intel_display.c | 150 ++++++++++++++++++++++-------------
1 file changed, 93 insertions(+), 57 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 14e05091c397..6faa529f35df 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3130,41 +3130,96 @@ 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;
}
+
+ ret = drm_atomic_commit(state);
+
+ WARN_ON(ret == -EDEADLK);
+ return ret;
}
void intel_prepare_reset(struct drm_device *dev)
{
+ struct drm_atomic_state *state;
+ struct drm_modeset_acquire_ctx *ctx;
+ struct drm_i915_private *dev_priv = to_i915(dev);
+ int ret;
+
/* no reset support for gen2 */
- if (IS_GEN2(dev))
+ if (IS_GEN2(dev_priv))
return;
- /* reset doesn't touch the display */
- if (INTEL_INFO(dev)->gen >= 5 || IS_G4X(dev))
+ drm_modeset_lock_all(dev);
+
+ /* reset doesn't touch the display, but flips might get nuked anyway, */
+ if (INTEL_INFO(dev_priv)->gen >= 5 || IS_G4X(dev_priv))
return;
- drm_modeset_lock_all(dev);
+ ctx = dev->mode_config.acquire_ctx;
+
/*
* Disabling the crtcs gracefully seems nicer. Also the
* g33 docs say we should at least disable all the planes.
*/
- intel_display_suspend(dev);
+
+ 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_device *dev)
{
struct drm_i915_private *dev_priv = to_i915(dev);
+ struct drm_atomic_state *state = dev_priv->modeset_restore_state;
+ int ret;
/*
* Flips in the rings will be nuked by the reset,
@@ -3177,6 +3232,8 @@ void intel_finish_reset(struct drm_device *dev)
if (IS_GEN2(dev))
return;
+ dev_priv->modeset_restore_state = NULL;
+
/* reset doesn't touch the display */
if (INTEL_INFO(dev)->gen >= 5 || IS_G4X(dev)) {
/*
@@ -3189,26 +3246,27 @@ void intel_finish_reset(struct drm_device *dev)
* CS-based flips (which might get lost in gpu resets) any more.
*/
intel_update_primary_planes(dev);
- 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);
+ } 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);
+ 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);
- 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);
+ spin_unlock_irq(&dev_priv->irq_lock);
- intel_display_resume(dev);
+ 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);
}
@@ -15955,9 +16013,10 @@ 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
@@ -15968,40 +16027,17 @@ 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;
-
- 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);
--
2.5.5
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