drm_atomic_state has a complicated single owner model that tracks the
single reference from allocation through to destruction on another
thread - or perhaps on a local error path. We can simplify this tracking
by using reference counting (at a cost of a few more atomics). This is
even more beneficial when the lifetime of the state becomes more
convoluted than being passed to a single worker thread for the commit.
v2: Double check !intel atomic_commit functions for missing gets
Signed-off-by: Chris Wilson
Cc: Daniel Vetter
---
drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c | 3 +-
drivers/gpu/drm/drm_atomic.c | 23 +++
drivers/gpu/drm/drm_atomic_helper.c | 98 +++-
drivers/gpu/drm/drm_fb_helper.c | 9 +--
drivers/gpu/drm/exynos/exynos_drm_drv.c | 3 +-
drivers/gpu/drm/i915/i915_debugfs.c | 3 +-
drivers/gpu/drm/i915/intel_display.c | 32 -
drivers/gpu/drm/i915/intel_sprite.c | 4 +-
drivers/gpu/drm/mediatek/mtk_drm_drv.c | 3 +-
drivers/gpu/drm/msm/msm_atomic.c | 3 +-
drivers/gpu/drm/omapdrm/omap_drv.c | 3 +-
drivers/gpu/drm/rcar-du/rcar_du_kms.c| 3 +-
drivers/gpu/drm/sti/sti_drv.c| 3 +-
drivers/gpu/drm/tegra/drm.c | 3 +-
drivers/gpu/drm/tilcdc/tilcdc_drv.c | 2 -
drivers/gpu/drm/vc4/vc4_kms.c| 3 +-
include/drm/drm_atomic.h | 12 +++-
include/drm/drm_crtc.h | 3 +
18 files changed, 85 insertions(+), 128 deletions(-)
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
index d4a3d61b7b06..15a9f9d3ef9a 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
@@ -464,7 +464,7 @@ atmel_hlcdc_dc_atomic_complete(struct atmel_hlcdc_dc_commit
*commit)
drm_atomic_helper_cleanup_planes(dev, old_state);
- drm_atomic_state_free(old_state);
+ drm_atomic_state_put(old_state);
/* Complete the commit, wake up any waiter. */
spin_lock(&dc->commit.wait.lock);
@@ -521,6 +521,7 @@ static int atmel_hlcdc_dc_atomic_commit(struct drm_device
*dev,
/* Swap the state, this is the point of no return. */
drm_atomic_helper_swap_state(state, true);
+ drm_atomic_state_get(state);
if (async)
queue_work(dc->wq, &commit->work);
else
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 5cb2e22d5d55..349c2f0de900 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -74,6 +74,8 @@ EXPORT_SYMBOL(drm_atomic_state_default_release);
int
drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state)
{
+ kref_init(&state->ref);
+
/* TODO legacy paths should maybe do a better job about
* setting this appropriately?
*/
@@ -215,22 +217,16 @@ void drm_atomic_state_clear(struct drm_atomic_state
*state)
EXPORT_SYMBOL(drm_atomic_state_clear);
/**
- * drm_atomic_state_free - free all memory for an atomic state
+ * __drm_atomic_state_free - free all memory for an atomic state
* @state: atomic state to deallocate
*
* This frees all memory associated with an atomic state, including all the
* per-object state for planes, crtcs and connectors.
*/
-void drm_atomic_state_free(struct drm_atomic_state *state)
+void __drm_atomic_state_free(struct kref *ref)
{
- struct drm_device *dev;
- struct drm_mode_config *config;
-
- if (!state)
- return;
-
- dev = state->dev;
- config = &dev->mode_config;
+ struct drm_atomic_state *state = container_of(ref, typeof(*state), ref);
+ struct drm_mode_config *config = &state->dev->mode_config;
drm_atomic_state_clear(state);
@@ -243,7 +239,7 @@ void drm_atomic_state_free(struct drm_atomic_state *state)
kfree(state);
}
}
-EXPORT_SYMBOL(drm_atomic_state_free);
+EXPORT_SYMBOL(__drm_atomic_state_free);
/**
* drm_atomic_get_crtc_state - get crtc state
@@ -1742,7 +1738,7 @@ retry:
if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {
/*
* Unlike commit, check_only does not clean up state.
-* Below we call drm_atomic_state_free for it.
+* Below we call drm_atomic_state_put for it.
*/
ret = drm_atomic_check_only(state);
} else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
@@ -1775,8 +1771,7 @@ out:
goto retry;
}
- if (ret || arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)
- drm_atomic_state_free(state);
+ drm_atomic_state_put(state);
drm_modeset_drop_locks(&ctx);
drm_modeset_acquire_fini(&ctx);
diff --git a/drivers/gpu/drm/drm_atomic_helper.c
b/drivers/gpu/drm/drm_atomic_helper.c
index 9abe0a242f96..14d
