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Subject[PATCH v11 1/2] drm/i915: Introduce async plane update to i915
Date
From: Gustavo Padovan <gustavo.padovan@collabora.com>

Add implementation for async plane update callbacks

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Tina Zhang <tina.zhang@intel.com>
Signed-off-by: Helen Koike <helen.koike@collabora.com>
Tested-by: Tina Zhang <tina.zhang@intel.com>

---
Hi,

I ran the following tests and no regressions were found:

./scripts/run-tests.sh -p -s -t ".*plane_cursor_legacy.*" -t
".*kms_cursor_legacy.*" -r results-`uname -r`-v11 -v

The igt test results can be found at
https://people.collabora.com/~koike/results-5.3.0-rc3+-v11/html

Thanks
Helen

Changes in v11:
- v10 https://patchwork.kernel.org/project/dri-devel/list/?series=147095
- rebase on drm-intel
- replace i915_gem_track_fb() by intel_frontbuffer_track()

Changes in v10:
- v9: https://patchwork.kernel.org/patch/11000561/
- rebase on drm-tip
- call i915_sw_fence_init() in the begining of intel_atomic_commit(),
otherwise drm_atomic_helper_prepare_planes() without initializing the
fence object, casing errors like:
ODEBUG: assert_init not available (active state 0) object type: i915_sw_fence hint: 0x0

Changes in v9:
- v8: https://patchwork.kernel.org/patch/10843395/
- Added tested-by tag
- submitted to intel-gfx@lists.freedesktop.org to invoke CI
- rebased and fixed conflicts on top of drm-tip

Changes in v8:
- v7: https://lkml.org/lkml/2018/6/8/168
- v7 was splited in two, one that adds the async callbacks and another
that updates the cursor.
- rebase with drm-intel
- allow async update in all types of planes, not only cursor
- add watermark checks in async update
- remove bypass of intel_prepare_plane_fb() in case of async update
- add missing drm_atomic_helper_cleanup_planes(dev, state) call in
intel_atomic_commit().
- use swap() function in async update to set the old_fb in the
new_state object.
- use helpers intel_update_plane()/intel_disable_plane()

Changes in v7:
- Rebase on top of drm-intel repository. Hopefully now will play
nicely with autobuilders.

Changes in v6:
- Rework the intel_plane_atomic_async_update due driver changed from
last time.
- Removed the mutex_lock/unlock as causes a deadlock.

Changes in v5:
- Call drm_atomic_helper_async_check() from the check hook

Changes in v4:
- Set correct vma to new state for cleanup
- Move size checks back to drivers (Ville Syrjälä)

Changes in v3:
- Move fb setting to core and use new state (Eric Anholt)

.../gpu/drm/i915/display/intel_atomic_plane.c | 71 +++++++++++++++++++
drivers/gpu/drm/i915/display/intel_display.c | 20 +++---
.../drm/i915/display/intel_display_types.h | 6 ++
3 files changed, 89 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_atomic_plane.c b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
index d1fcdf206da4..faa5d74e3ccf 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic_plane.c
+++ b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
@@ -365,8 +365,79 @@ void i9xx_update_planes_on_crtc(struct intel_atomic_state *state,
}
}

+static int intel_plane_atomic_async_check(struct drm_plane *plane,
+ struct drm_plane_state *state)
+{
+ struct drm_crtc_state *crtc_state;
+
+ crtc_state = drm_atomic_get_existing_crtc_state(state->state,
+ state->crtc);
+ if (WARN_ON(!crtc_state))
+ return -EINVAL;
+
+ /*
+ * When crtc is inactive or there is a modeset pending,
+ * wait for it to complete in the slowpath
+ */
+ if (!crtc_state->active || to_intel_crtc_state(crtc_state)->update_pipe)
+ return -EINVAL;
+
+ /*
+ * If any parameters change that may affect watermarks,
+ * take the slowpath. Only changing fb or position should be
+ * in the fastpath.
+ */
+ if (plane->state->crtc != state->crtc ||
+ plane->state->src_w != state->src_w ||
+ plane->state->src_h != state->src_h ||
+ plane->state->crtc_w != state->crtc_w ||
+ plane->state->crtc_h != state->crtc_h ||
+ !plane->state->fb != !state->fb)
+ return -EINVAL;
+
+ return 0;
+}
+
+static void intel_plane_atomic_async_update(struct drm_plane *plane,
+ struct drm_plane_state *new_state)
+{
+ struct intel_atomic_state *intel_new_state =
+ to_intel_atomic_state(new_state->state);
+ struct intel_plane *intel_plane = to_intel_plane(plane);
+ struct drm_crtc *crtc = plane->state->crtc;
+ struct intel_crtc_state *new_crtc_state;
+ struct intel_crtc *intel_crtc;
+ int i;
+
+ for_each_new_intel_crtc_in_state(intel_new_state, intel_crtc,
+ new_crtc_state, i)
+ WARN_ON(new_crtc_state->wm.need_postvbl_update ||
+ new_crtc_state->update_wm_post);
+
+ intel_frontbuffer_track(to_intel_frontbuffer(plane->state->fb),
+ to_intel_frontbuffer(new_state->fb),
+ intel_plane->frontbuffer_bit);
+
+ plane->state->src_x = new_state->src_x;
+ plane->state->src_y = new_state->src_y;
+ plane->state->crtc_x = new_state->crtc_x;
+ plane->state->crtc_y = new_state->crtc_y;
+
+ swap(plane->state->fb, new_state->fb);
+
+ if (plane->state->visible)
+ intel_update_plane(intel_plane,
+ to_intel_crtc_state(crtc->state),
+ to_intel_plane_state(plane->state));
+ else
+ intel_disable_plane(intel_plane,
+ to_intel_crtc_state(crtc->state));
+}
+
const struct drm_plane_helper_funcs intel_plane_helper_funcs = {
.prepare_fb = intel_prepare_plane_fb,
.cleanup_fb = intel_cleanup_plane_fb,
.atomic_check = intel_plane_atomic_check,
+ .atomic_async_check = intel_plane_atomic_async_check,
+ .atomic_async_update = intel_plane_atomic_async_update,
};
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index b51d1ceb8739..8ee74cda5b45 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -3158,12 +3158,6 @@ static void intel_plane_disable_noatomic(struct intel_crtc *crtc,
intel_disable_plane(plane, crtc_state);
}

-static struct intel_frontbuffer *
-to_intel_frontbuffer(struct drm_framebuffer *fb)
-{
- return fb ? to_intel_framebuffer(fb)->frontbuffer : NULL;
-}
-
static void
intel_find_initial_plane_obj(struct intel_crtc *intel_crtc,
struct intel_initial_plane_config *plane_config)
@@ -14129,11 +14123,21 @@ static int intel_atomic_commit(struct drm_device *dev,
struct drm_i915_private *dev_priv = to_i915(dev);
int ret = 0;

+ i915_sw_fence_init(&state->commit_ready,
+ intel_atomic_commit_ready);
+
+ if (_state->async_update) {
+ ret = drm_atomic_helper_prepare_planes(dev, _state);
+ if (ret)
+ return ret;
+ drm_atomic_helper_async_commit(dev, _state);
+ drm_atomic_helper_cleanup_planes(dev, _state);
+ return 0;
+ }
+
state->wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);

drm_atomic_state_get(&state->base);
- i915_sw_fence_init(&state->commit_ready,
- intel_atomic_commit_ready);

/*
* The intel_legacy_cursor_update() fast path takes care
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 449abaea619f..00ebe5b99f25 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1092,6 +1092,12 @@ struct cxsr_latency {
#define to_intel_plane_state(x) container_of(x, struct intel_plane_state, base)
#define intel_fb_obj(x) ((x) ? to_intel_bo((x)->obj[0]) : NULL)

+static inline struct intel_frontbuffer *
+to_intel_frontbuffer(struct drm_framebuffer *fb)
+{
+ return fb ? to_intel_framebuffer(fb)->frontbuffer : NULL;
+}
+
struct intel_hdmi {
i915_reg_t hdmi_reg;
int ddc_bus;
--
2.22.0
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