[Intel-gfx] [PATCH] drm/i915: nonblocking commit
Daniel Vetter
daniel.vetter at ffwll.ch
Tue Jun 14 16:01:00 UTC 2016
Simply split intel_atomic_commit in half and place the new
nonblocking commit helpers at the right spots.
NOTE: There's still trouble with obj->frontbuffer bits getting mangled
when pipelining atomic commits.
v2:
- Remove the check for nonblocking which returned -EINVAL.
- Do wait for requests in the worker thread before committing
hw state.
v3: Move hw_done after the optimize_wm/post_plane_update step, plus
add FIXME comment how to fix that up again properly.
v4: Update FIXME for intel_atomic_commit - more stuff works now.
v5: Still reject nonblocking modeset commits (Maarten).
v6: Use intel_state->modeset (Maarten).
Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
---
drivers/gpu/drm/i915/intel_display.c | 126 ++++++++++++++++++++++++-----------
1 file changed, 87 insertions(+), 39 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 78fa0c1d7847..f20fa569b446 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13549,11 +13549,6 @@ static int intel_atomic_prepare_commit(struct drm_device *dev,
struct drm_crtc *crtc;
int i, ret;
- if (nonblock) {
- DRM_DEBUG_KMS("i915 does not yet support nonblocking commit\n");
- return -EINVAL;
- }
-
for_each_crtc_in_state(state, crtc, crtc_state, i) {
if (state->legacy_cursor_update)
continue;
@@ -13672,50 +13667,34 @@ static bool needs_vblank_wait(struct intel_crtc_state *crtc_state)
return false;
}
-/**
- * intel_atomic_commit - commit validated state object
- * @dev: DRM device
- * @state: the top-level driver state object
- * @nonblock: nonblocking commit
- *
- * This function commits a top-level state object that has been validated
- * with drm_atomic_helper_check().
- *
- * FIXME: Atomic modeset support for i915 is not yet complete. At the moment
- * we can only handle plane-related operations and do not yet support
- * nonblocking commit.
- *
- * RETURNS
- * Zero for success or -errno.
- */
-static int intel_atomic_commit(struct drm_device *dev,
- struct drm_atomic_state *state,
- bool nonblock)
+static void intel_atomic_commit_tail(struct drm_atomic_state *state)
{
+ struct drm_device *dev = state->dev;
struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_crtc_state *old_crtc_state;
struct drm_crtc *crtc;
struct intel_crtc_state *intel_cstate;
- int ret = 0, i;
+ struct drm_plane *plane;
+ struct drm_plane_state *plane_state;
bool hw_check = intel_state->modeset;
unsigned long put_domains[I915_MAX_PIPES] = {};
unsigned crtc_vblank_mask = 0;
+ int i, ret;
- ret = drm_atomic_helper_setup_commit(state, nonblock);
- if (ret)
- return ret;
+ for_each_plane_in_state(state, plane, plane_state, i) {
+ struct intel_plane_state *intel_plane_state =
+ to_intel_plane_state(plane_state);
- ret = intel_atomic_prepare_commit(dev, state, nonblock);
- if (ret) {
- DRM_DEBUG_ATOMIC("Preparing state failed with %i\n", ret);
- return ret;
- }
+ if (!intel_plane_state->wait_req)
+ continue;
- drm_atomic_helper_swap_state(state, true);
- dev_priv->wm.distrust_bios_wm = false;
- dev_priv->wm.skl_results = intel_state->wm_results;
- intel_shared_dpll_commit(state);
+ ret = __i915_wait_request(intel_plane_state->wait_req,
+ true, NULL, NULL);
+ /* EIO should be eaten, and we can't get interrupted in the
+ * worker, and blocking commits have waited already. */
+ WARN_ON(ret);
+ }
drm_atomic_helper_wait_for_dependencies(state);
@@ -13814,8 +13793,15 @@ static int intel_atomic_commit(struct drm_device *dev,
crtc_vblank_mask |= 1 << i;
}
- drm_atomic_helper_commit_hw_done(state);
-
+ /* FIXME: We should call drm_atomic_helper_commit_hw_done() here
+ * already, but still need the state for the delayed optimization. To
+ * fix this:
+ * - wrap the optimization/post_plane_update stuff into a per-crtc work.
+ * - schedule that vblank worker _before_ calling hw_done
+ * - at the start of commit_tail, cancel it _synchrously
+ * - switch over to the vblank wait helper in the core after that since
+ * we don't need out special handling any more.
+ */
if (!state->legacy_cursor_update)
intel_atomic_wait_for_vblanks(dev, dev_priv, crtc_vblank_mask);
@@ -13842,6 +13828,8 @@ static int intel_atomic_commit(struct drm_device *dev,
intel_modeset_verify_crtc(crtc, old_crtc_state, crtc->state);
}
+ drm_atomic_helper_commit_hw_done(state);
+
if (intel_state->modeset)
intel_display_power_put(dev_priv, POWER_DOMAIN_MODESET);
@@ -13865,6 +13853,66 @@ static int intel_atomic_commit(struct drm_device *dev,
* can happen also when the device is completely off.
*/
intel_uncore_arm_unclaimed_mmio_detection(dev_priv);
+}
+
+static void intel_atomic_commit_work(struct work_struct *work)
+{
+ struct drm_atomic_state *state = container_of(work,
+ struct drm_atomic_state,
+ commit_work);
+ intel_atomic_commit_tail(state);
+}
+
+/**
+ * intel_atomic_commit - commit validated state object
+ * @dev: DRM device
+ * @state: the top-level driver state object
+ * @nonblock: nonblocking commit
+ *
+ * This function commits a top-level state object that has been validated
+ * with drm_atomic_helper_check().
+ *
+ * FIXME: Atomic modeset support for i915 is not yet complete. At the moment
+ * nonblocking commits are only safe for pure plane updates. Everything else
+ * should work though.
+ *
+ * RETURNS
+ * Zero for success or -errno.
+ */
+static int intel_atomic_commit(struct drm_device *dev,
+ struct drm_atomic_state *state,
+ bool nonblock)
+{
+ struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ int ret = 0;
+
+ if (intel_state->modeset && nonblock) {
+ DRM_DEBUG_KMS("nonblocking commit for modeset not yet implemented.\n");
+ return -EINVAL;
+ }
+
+ ret = drm_atomic_helper_setup_commit(state, nonblock);
+ if (ret)
+ return ret;
+
+ INIT_WORK(&state->commit_work, intel_atomic_commit_work);
+
+ ret = intel_atomic_prepare_commit(dev, state, nonblock);
+ if (ret) {
+ DRM_DEBUG_ATOMIC("Preparing state failed with %i\n", ret);
+ return ret;
+ }
+
+ drm_atomic_helper_swap_state(state, true);
+ dev_priv->wm.distrust_bios_wm = false;
+ dev_priv->wm.skl_results = intel_state->wm_results;
+ intel_shared_dpll_commit(state);
+
+ if (nonblock)
+ queue_work(system_unbound_wq, &state->commit_work);
+ else
+ intel_atomic_commit_tail(state);
return 0;
}
--
2.8.1
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