[Intel-gfx] [PATCH 14/14] drm/i915: Commit skl+ planes in an order that avoids ddb overlaps
Ville Syrjala
ville.syrjala at linux.intel.com
Thu Nov 1 15:06:05 UTC 2018
From: Ville Syrjälä <ville.syrjala at linux.intel.com>
skl+ can go belly up if there are overlapping ddb allocations between
planes. If we could absolutely guarantee that we can perform the atomic
update within a single frame we shouldn't have to worry about this. But
we can't rely on that so let's steal the ddb overlap check trick from
skl_update_crtcs() and apply it to the plane updates. Since each step
of the sequence is free from ddb overlaps we don't have to worry about
a vblank sneaking up on us in the middle of the sequence. The partial
state that gets latched by the hardware will be safe. And unlike
skl_update_crtcs() we don't have to intoduce any extra vblank waits
on accoung of only having to worry about a single pipe.
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
drivers/gpu/drm/i915/intel_atomic_plane.c | 96 ++++++++++++++++++++---
drivers/gpu/drm/i915/intel_display.c | 7 +-
drivers/gpu/drm/i915/intel_drv.h | 8 +-
3 files changed, 93 insertions(+), 18 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_atomic_plane.c b/drivers/gpu/drm/i915/intel_atomic_plane.c
index 69fc7010190c..ff8d3e577bbf 100644
--- a/drivers/gpu/drm/i915/intel_atomic_plane.c
+++ b/drivers/gpu/drm/i915/intel_atomic_plane.c
@@ -169,24 +169,75 @@ static int intel_plane_atomic_check(struct drm_plane *plane,
to_intel_plane_state(new_plane_state));
}
-void intel_update_planes_on_crtc(struct intel_atomic_state *old_state,
- struct intel_crtc *crtc,
- struct intel_crtc_state *old_crtc_state,
- struct intel_crtc_state *new_crtc_state)
+static struct intel_plane *
+skl_next_plane_to_commit(struct intel_atomic_state *state,
+ struct intel_crtc *crtc,
+ struct skl_ddb_entry entries_y[I915_MAX_PLANES],
+ struct skl_ddb_entry entries_uv[I915_MAX_PLANES],
+ unsigned int *update_mask)
{
- u32 update_mask = new_crtc_state->update_planes;
- struct intel_plane_state *new_plane_state;
+ struct intel_crtc_state *crtc_state =
+ intel_atomic_get_new_crtc_state(state, crtc);
+ struct intel_plane_state *plane_state;
struct intel_plane *plane;
int i;
- for_each_new_intel_plane_in_state(old_state, plane, new_plane_state, i) {
+ if (*update_mask == 0)
+ return NULL;
+
+ for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
+ enum plane_id plane_id = plane->id;
+
if (crtc->pipe != plane->pipe ||
- !(update_mask & BIT(plane->id)))
+ !(*update_mask & BIT(plane_id)))
continue;
+ if (skl_ddb_allocation_overlaps(&crtc_state->wm.skl.plane_ddb_y[plane_id],
+ entries_y,
+ I915_MAX_PLANES, plane_id) ||
+ skl_ddb_allocation_overlaps(&crtc_state->wm.skl.plane_ddb_uv[plane_id],
+ entries_uv,
+ I915_MAX_PLANES, plane_id))
+ continue;
+
+ *update_mask &= ~BIT(plane_id);
+ entries_y[plane_id] = crtc_state->wm.skl.plane_ddb_y[plane_id];
+ entries_uv[plane_id] = crtc_state->wm.skl.plane_ddb_uv[plane_id];
+
+ return plane;
+ }
+
+ /* should never happen */
+ WARN_ON(1);
+
+ return NULL;
+}
+
+void skl_update_planes_on_crtc(struct intel_atomic_state *state,
+ struct intel_crtc *crtc)
+{
+ struct intel_crtc_state *old_crtc_state =
+ intel_atomic_get_old_crtc_state(state, crtc);
+ struct intel_crtc_state *new_crtc_state =
+ intel_atomic_get_new_crtc_state(state, crtc);
+ struct skl_ddb_entry entries_y[I915_MAX_PLANES];
+ struct skl_ddb_entry entries_uv[I915_MAX_PLANES];
+ u32 update_mask = new_crtc_state->update_planes;
+ struct intel_plane *plane;
+
+ memcpy(entries_y, old_crtc_state->wm.skl.plane_ddb_y,
+ sizeof(old_crtc_state->wm.skl.plane_ddb_y));
+ memcpy(entries_uv, old_crtc_state->wm.skl.plane_ddb_uv,
+ sizeof(old_crtc_state->wm.skl.plane_ddb_uv));
+
+ while ((plane = skl_next_plane_to_commit(state, crtc,
+ entries_y, entries_uv,
+ &update_mask))) {
+ struct intel_plane_state *new_plane_state =
+ intel_atomic_get_new_plane_state(state, plane);
+
if (new_plane_state->base.visible) {
trace_intel_update_plane(&plane->base, crtc);
-
plane->update_plane(plane, new_crtc_state, new_plane_state);
} else if (new_plane_state->slave) {
struct intel_plane *master =
@@ -202,14 +253,37 @@ void intel_update_planes_on_crtc(struct intel_atomic_state *old_state,
* plane_state.
*/
new_plane_state =
- intel_atomic_get_new_plane_state(old_state, master);
+ intel_atomic_get_new_plane_state(state, master);
trace_intel_update_plane(&plane->base, crtc);
-
plane->update_slave(plane, new_crtc_state, new_plane_state);
} else {
trace_intel_disable_plane(&plane->base, crtc);
+ plane->disable_plane(plane, new_crtc_state);
+ }
+ }
+}
+
+void i9xx_update_planes_on_crtc(struct intel_atomic_state *state,
+ struct intel_crtc *crtc)
+{
+ struct intel_crtc_state *new_crtc_state =
+ intel_atomic_get_new_crtc_state(state, crtc);
+ u32 update_mask = new_crtc_state->update_planes;
+ struct intel_plane_state *new_plane_state;
+ struct intel_plane *plane;
+ int i;
+
+ for_each_new_intel_plane_in_state(state, plane, new_plane_state, i) {
+ if (crtc->pipe != plane->pipe ||
+ !(update_mask & BIT(plane->id)))
+ continue;
+ if (new_plane_state->base.visible) {
+ trace_intel_update_plane(&plane->base, crtc);
+ plane->update_plane(plane, new_crtc_state, new_plane_state);
+ } else {
+ trace_intel_disable_plane(&plane->base, crtc);
plane->disable_plane(plane, new_crtc_state);
}
}
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 6905a267a13f..7be7c099e8c0 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -12640,7 +12640,6 @@ static void intel_update_crtc(struct drm_crtc *crtc,
struct drm_device *dev = crtc->dev;
struct drm_i915_private *dev_priv = to_i915(dev);
struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
- struct intel_crtc_state *old_intel_cstate = to_intel_crtc_state(old_crtc_state);
struct intel_crtc_state *pipe_config = to_intel_crtc_state(new_crtc_state);
bool modeset = needs_modeset(new_crtc_state);
struct intel_plane_state *new_plane_state =
@@ -12663,8 +12662,10 @@ static void intel_update_crtc(struct drm_crtc *crtc,
intel_begin_crtc_commit(crtc, old_crtc_state);
- intel_update_planes_on_crtc(to_intel_atomic_state(state), intel_crtc,
- old_intel_cstate, pipe_config);
+ if (INTEL_GEN(dev_priv) >= 9)
+ skl_update_planes_on_crtc(to_intel_atomic_state(state), intel_crtc);
+ else
+ i9xx_update_planes_on_crtc(to_intel_atomic_state(state), intel_crtc);
intel_finish_crtc_commit(crtc, old_crtc_state);
}
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 8a93e0e8c89d..653174b22773 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -2290,10 +2290,10 @@ struct drm_plane_state *intel_plane_duplicate_state(struct drm_plane *plane);
void intel_plane_destroy_state(struct drm_plane *plane,
struct drm_plane_state *state);
extern const struct drm_plane_helper_funcs intel_plane_helper_funcs;
-void intel_update_planes_on_crtc(struct intel_atomic_state *old_state,
- struct intel_crtc *crtc,
- struct intel_crtc_state *old_crtc_state,
- struct intel_crtc_state *new_crtc_state);
+void skl_update_planes_on_crtc(struct intel_atomic_state *state,
+ struct intel_crtc *crtc);
+void i9xx_update_planes_on_crtc(struct intel_atomic_state *state,
+ struct intel_crtc *crtc);
int intel_plane_atomic_check_with_state(const struct intel_crtc_state *old_crtc_state,
struct intel_crtc_state *crtc_state,
const struct intel_plane_state *old_plane_state,
--
2.18.1
More information about the Intel-gfx
mailing list