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 v3: Update kerneldocs
Signed-off-by: Chris Wilson chris@chris-wilson.co.uk Cc: Daniel Vetter daniel.vetter@ffwll.ch Cc: dri-devel@lists.freedesktop.org Reviewed-by: Eric Engestrom eric.engestrom@imgtec.com --- drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c | 3 +- drivers/gpu/drm/drm_atomic.c | 25 +++---- 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 | 28 +++++++- include/drm/drm_crtc.h | 3 + 18 files changed, 102 insertions(+), 129 deletions(-)
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c index 8e7483d90c47..c9e645fa1233 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 0b8f33da1488..d3065ffe6611 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 - * @state: atomic state to deallocate + * __drm_atomic_state_free - free all memory for an atomic state + * @ref: This 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 6fdd7ba47896..a5e8701f1ca3 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -1190,7 +1190,7 @@ static void commit_tail(struct drm_atomic_state *state)
drm_atomic_helper_commit_cleanup_done(state);
- drm_atomic_state_free(state); + drm_atomic_state_put(state); }
static void commit_work(struct work_struct *work) @@ -1266,6 +1266,7 @@ int drm_atomic_helper_commit(struct drm_device *dev, * make sure work items don't artifically stall on each another. */
+ drm_atomic_state_get(state); if (nonblock) queue_work(system_unbound_wq, &state->commit_work); else @@ -1567,7 +1568,7 @@ EXPORT_SYMBOL(drm_atomic_helper_commit_hw_done); * * This signals completion of the atomic update @state, including any cleanup * work. If used, it must be called right before calling - * drm_atomic_state_free(). + * drm_atomic_state_put(). * * This is part of the atomic helper support for nonblocking commits, see * drm_atomic_helper_setup_commit() for an overview. @@ -2090,18 +2091,13 @@ retry: state->legacy_cursor_update = true;
ret = drm_atomic_commit(state); - if (ret != 0) - goto fail; - - /* Driver takes ownership of state on successful commit. */ - return 0; fail: if (ret == -EDEADLK) goto backoff;
- drm_atomic_state_free(state); - + drm_atomic_state_put(state); return ret; + backoff: drm_atomic_state_clear(state); drm_atomic_legacy_backoff(state); @@ -2163,18 +2159,13 @@ retry: goto fail;
ret = drm_atomic_commit(state); - if (ret != 0) - goto fail; - - /* Driver takes ownership of state on successful commit. */ - return 0; fail: if (ret == -EDEADLK) goto backoff;
- drm_atomic_state_free(state); - + drm_atomic_state_put(state); return ret; + backoff: drm_atomic_state_clear(state); drm_atomic_legacy_backoff(state); @@ -2303,18 +2294,13 @@ retry: goto fail;
ret = drm_atomic_commit(state); - if (ret != 0) - goto fail; - - /* Driver takes ownership of state on successful commit. */ - return 0; fail: if (ret == -EDEADLK) goto backoff;
- drm_atomic_state_free(state); - + drm_atomic_state_put(state); return ret; + backoff: drm_atomic_state_clear(state); drm_atomic_legacy_backoff(state); @@ -2456,11 +2442,8 @@ int drm_atomic_helper_disable_all(struct drm_device *dev, }
err = drm_atomic_commit(state); - free: - if (err < 0) - drm_atomic_state_free(state); - + drm_atomic_state_put(state); return err; } EXPORT_SYMBOL(drm_atomic_helper_disable_all); @@ -2511,7 +2494,7 @@ retry:
err = drm_atomic_helper_disable_all(dev, &ctx); if (err < 0) { - drm_atomic_state_free(state); + drm_atomic_state_put(state); state = ERR_PTR(err); goto unlock; } @@ -2600,18 +2583,13 @@ retry: goto fail;
ret = drm_atomic_commit(state); - if (ret != 0) - goto fail; - - /* Driver takes ownership of state on successful commit. */ - return 0; fail: if (ret == -EDEADLK) goto backoff;
- drm_atomic_state_free(state); - + drm_atomic_state_put(state); return ret; + backoff: drm_atomic_state_clear(state); drm_atomic_legacy_backoff(state); @@ -2660,18 +2638,13 @@ retry: goto fail;
ret = drm_atomic_commit(state); - if (ret != 0) - goto fail; - - /* Driver takes ownership of state on successful commit. */ - return 0; fail: if (ret == -EDEADLK) goto backoff;
- drm_atomic_state_free(state); - + drm_atomic_state_put(state); return ret; + backoff: drm_atomic_state_clear(state); drm_atomic_legacy_backoff(state); @@ -2720,18 +2693,13 @@ retry: goto fail;
ret = drm_atomic_commit(state); - if (ret != 0) - goto fail; - - /* Driver takes ownership of state on successful commit. */ - return 0; fail: if (ret == -EDEADLK) goto backoff;
- drm_atomic_state_free(state); - + drm_atomic_state_put(state); return ret; + backoff: drm_atomic_state_clear(state); drm_atomic_legacy_backoff(state); @@ -2804,18 +2772,13 @@ retry: }
ret = drm_atomic_nonblocking_commit(state); - if (ret != 0) - goto fail; - - /* Driver takes ownership of state on successful commit. */ - return 0; fail: if (ret == -EDEADLK) goto backoff;
- drm_atomic_state_free(state); - + drm_atomic_state_put(state); return ret; + backoff: drm_atomic_state_clear(state); drm_atomic_legacy_backoff(state); @@ -2891,19 +2854,14 @@ retry: crtc_state->active = active;
ret = drm_atomic_commit(state); - if (ret != 0) - goto fail; - - /* Driver takes ownership of state on successful commit. */ - return 0; fail: if (ret == -EDEADLK) goto backoff;
connector->dpms = old_mode; - drm_atomic_state_free(state); - + drm_atomic_state_put(state); return ret; + backoff: drm_atomic_state_clear(state); drm_atomic_legacy_backoff(state); @@ -3310,7 +3268,7 @@ drm_atomic_helper_duplicate_state(struct drm_device *dev,
free: if (err < 0) { - drm_atomic_state_free(state); + drm_atomic_state_put(state); state = ERR_PTR(err); }
@@ -3425,22 +3383,14 @@ retry: goto fail;
ret = drm_atomic_commit(state); - if (ret) - goto fail; - - /* Driver takes ownership of state on successful commit. */ - - drm_property_unreference_blob(blob); - - return 0; fail: if (ret == -EDEADLK) goto backoff;
- drm_atomic_state_free(state); + drm_atomic_state_put(state); drm_property_unreference_blob(blob); - return ret; + backoff: drm_atomic_state_clear(state); drm_atomic_legacy_backoff(state); diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index dd8e3b68fd53..05a711ecf97a 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -365,9 +365,7 @@ fail: if (ret == -EDEADLK) goto backoff;
- if (ret != 0) - drm_atomic_state_free(state); - + drm_atomic_state_put(state); return ret;
backoff: @@ -1359,16 +1357,13 @@ retry: info->var.xoffset = var->xoffset; info->var.yoffset = var->yoffset;
- fail: drm_atomic_clean_old_fb(dev, plane_mask, ret);
if (ret == -EDEADLK) goto backoff;
- if (ret != 0) - drm_atomic_state_free(state); - + drm_atomic_state_put(state); return ret;
backoff: diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c index 486943e70f70..f11ba20781ce 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c @@ -111,7 +111,7 @@ static void exynos_atomic_commit_complete(struct exynos_atomic_commit *commit)
drm_atomic_helper_cleanup_planes(dev, state);
- drm_atomic_state_free(state); + drm_atomic_state_put(state);
spin_lock(&priv->lock); priv->pending &= ~commit->crtcs; @@ -296,6 +296,7 @@ int exynos_atomic_commit(struct drm_device *dev, struct drm_atomic_state *state,
drm_atomic_helper_swap_state(state, true);
+ drm_atomic_state_get(state); if (nonblock) schedule_work(&commit->work); else diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index d89359a50742..f51a750bc57a 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -3954,8 +3954,7 @@ static void hsw_trans_edp_pipe_A_crc_wa(struct drm_i915_private *dev_priv, out: drm_modeset_unlock_all(dev); WARN(ret, "Toggling workaround to %i returns %i\n", enable, ret); - if (ret) - drm_atomic_state_free(state); + drm_atomic_state_put(state); }
static int ivb_pipe_crc_ctl_reg(struct drm_i915_private *dev_priv, diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 19ffd024ddec..fc2453919035 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -3577,7 +3577,7 @@ void intel_prepare_reset(struct drm_i915_private *dev_priv) return;
err: - drm_atomic_state_free(state); + drm_atomic_state_put(state); }
void intel_finish_reset(struct drm_i915_private *dev_priv) @@ -3638,6 +3638,7 @@ void intel_finish_reset(struct drm_i915_private *dev_priv) intel_hpd_init(dev_priv); }
+ drm_atomic_state_put(state); drm_modeset_drop_locks(ctx); drm_modeset_acquire_fini(ctx); mutex_unlock(&dev->mode_config.mutex); @@ -6866,7 +6867,7 @@ static void intel_crtc_disable_noatomic(struct drm_crtc *crtc)
dev_priv->display.crtc_disable(crtc_state, state);
- drm_atomic_state_free(state); + drm_atomic_state_put(state);
DRM_DEBUG_KMS("[CRTC:%d:%s] hw state adjusted, was enabled, now disabled\n", crtc->base.id, crtc->name); @@ -11249,11 +11250,13 @@ found:
/* let the connector get through one full cycle before testing */ intel_wait_for_vblank(dev, intel_crtc->pipe); + drm_atomic_state_put(state); + drm_atomic_state_put(restore_state); return true;
fail: - drm_atomic_state_free(state); - drm_atomic_state_free(restore_state); + drm_atomic_state_put(state); + drm_atomic_state_put(restore_state); restore_state = state = NULL;
if (ret == -EDEADLK) { @@ -11282,10 +11285,9 @@ void intel_release_load_detect_pipe(struct drm_connector *connector, return;
ret = drm_atomic_commit(state); - if (ret) { + if (ret) DRM_DEBUG_KMS("Couldn't release load detect pipe: %i\n", ret); - drm_atomic_state_free(state); - } + drm_atomic_state_put(state); }
static int i9xx_pll_refclk(struct drm_device *dev, @@ -12356,8 +12358,7 @@ retry: goto retry; }
- if (ret) - drm_atomic_state_free(state); + drm_atomic_state_put(state);
if (ret == 0 && event) { spin_lock_irq(&dev->event_lock); @@ -14450,7 +14451,7 @@ static void intel_atomic_commit_tail(struct drm_atomic_state *state)
drm_atomic_helper_commit_cleanup_done(state);
- drm_atomic_state_free(state); + drm_atomic_state_put(state);
/* As one of the primary mmio accessors, KMS has a high likelihood * of triggering bugs in unclaimed access. After we finish @@ -14533,6 +14534,7 @@ static int intel_atomic_commit(struct drm_device *dev, intel_shared_dpll_commit(state); intel_atomic_track_fbs(state);
+ drm_atomic_state_get(state); if (nonblock) queue_work(system_unbound_wq, &state->commit_work); else @@ -14574,9 +14576,8 @@ retry: goto retry; }
- if (ret) out: - drm_atomic_state_free(state); + drm_atomic_state_put(state); }
/* @@ -16318,8 +16319,8 @@ retry: dev_priv->display.optimize_watermarks(cs); }
- drm_atomic_state_free(state); fail: + drm_atomic_state_put(state); drm_modeset_drop_locks(&ctx); drm_modeset_acquire_fini(&ctx); } @@ -16956,10 +16957,9 @@ void intel_display_resume(struct drm_device *dev) drm_modeset_acquire_fini(&ctx); mutex_unlock(&dev->mode_config.mutex);
- if (ret) { + if (ret) DRM_ERROR("Restoring old state failed with %i\n", ret); - drm_atomic_state_free(state); - } + drm_atomic_state_put(state); }
void intel_modeset_gem_init(struct drm_device *dev) diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c index 0df783a66bfb..be819d86beae 100644 --- a/drivers/gpu/drm/i915/intel_sprite.c +++ b/drivers/gpu/drm/i915/intel_sprite.c @@ -982,9 +982,7 @@ int intel_sprite_set_colorkey(struct drm_device *dev, void *data, drm_modeset_backoff(&ctx); }
- if (ret) - drm_atomic_state_free(state); - + drm_atomic_state_put(state); out: drm_modeset_drop_locks(&ctx); drm_modeset_acquire_fini(&ctx); diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c index 72c1ae4e02d4..5ab6017575ea 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c @@ -83,7 +83,7 @@ static void mtk_atomic_complete(struct mtk_drm_private *private, drm_atomic_helper_wait_for_vblanks(drm, state);
drm_atomic_helper_cleanup_planes(drm, state); - drm_atomic_state_free(state); + drm_atomic_state_put(state); }
static void mtk_atomic_work(struct work_struct *work) @@ -110,6 +110,7 @@ static int mtk_atomic_commit(struct drm_device *drm,
drm_atomic_helper_swap_state(state, true);
+ drm_atomic_state_get(state); if (async) mtk_atomic_schedule(private, state); else diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c index 5df252cebf1c..9a268efeb740 100644 --- a/drivers/gpu/drm/msm/msm_atomic.c +++ b/drivers/gpu/drm/msm/msm_atomic.c @@ -141,7 +141,7 @@ static void complete_commit(struct msm_commit *c, bool async)
kms->funcs->complete_commit(kms, state);
- drm_atomic_state_free(state); + drm_atomic_state_put(state);
commit_destroy(c); } @@ -256,6 +256,7 @@ int msm_atomic_commit(struct drm_device *dev, * current layout. */
+ drm_atomic_state_get(state); if (nonblock) { queue_work(priv->atomic_wq, &c->work); return 0; diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c index e1cfba51cff6..1735c7accf72 100644 --- a/drivers/gpu/drm/omapdrm/omap_drv.c +++ b/drivers/gpu/drm/omapdrm/omap_drv.c @@ -105,7 +105,7 @@ static void omap_atomic_complete(struct omap_atomic_state_commit *commit)
dispc_runtime_put();
- drm_atomic_state_free(old_state); + drm_atomic_state_put(old_state);
/* Complete the commit, wake up any waiter. */ spin_lock(&priv->commit.lock); @@ -176,6 +176,7 @@ static int omap_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 (nonblock) schedule_work(&commit->work); else diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c index bd9c3bb9252c..c76ed9ee6a01 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c @@ -264,7 +264,7 @@ static void rcar_du_atomic_complete(struct rcar_du_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(&rcdu->commit.wait.lock); @@ -330,6 +330,7 @@ static int rcar_du_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 (nonblock) schedule_work(&commit->work); else diff --git a/drivers/gpu/drm/sti/sti_drv.c b/drivers/gpu/drm/sti/sti_drv.c index 7cd3804c6dee..7ad8d42dba28 100644 --- a/drivers/gpu/drm/sti/sti_drv.c +++ b/drivers/gpu/drm/sti/sti_drv.c @@ -184,7 +184,7 @@ static void sti_atomic_complete(struct sti_private *private, drm_atomic_helper_wait_for_vblanks(drm, state);
drm_atomic_helper_cleanup_planes(drm, state); - drm_atomic_state_free(state); + drm_atomic_state_put(state); }
static void sti_atomic_work(struct work_struct *work) @@ -217,6 +217,7 @@ static int sti_atomic_commit(struct drm_device *drm,
drm_atomic_helper_swap_state(state, true);
+ drm_atomic_state_get(state); if (nonblock) sti_atomic_schedule(private, state); else diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c index 4b9f1c79cd7b..4ca8f2f3c46b 100644 --- a/drivers/gpu/drm/tegra/drm.c +++ b/drivers/gpu/drm/tegra/drm.c @@ -63,7 +63,7 @@ static void tegra_atomic_complete(struct tegra_drm *tegra, drm_atomic_helper_wait_for_vblanks(drm, state);
drm_atomic_helper_cleanup_planes(drm, state); - drm_atomic_state_free(state); + drm_atomic_state_put(state); }
static void tegra_atomic_work(struct work_struct *work) @@ -96,6 +96,7 @@ static int tegra_atomic_commit(struct drm_device *drm,
drm_atomic_helper_swap_state(state, true);
+ drm_atomic_state_get(state); if (nonblock) tegra_atomic_schedule(tegra, state); else diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c b/drivers/gpu/drm/tilcdc/tilcdc_drv.c index 4405e4bc8056..432af1fea238 100644 --- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c +++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c @@ -129,8 +129,6 @@ static int tilcdc_commit(struct drm_device *dev,
drm_atomic_helper_cleanup_planes(dev, state);
- drm_atomic_state_free(state); - return 0; }
diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c index c1f65c6c8e60..f31f72af8551 100644 --- a/drivers/gpu/drm/vc4/vc4_kms.c +++ b/drivers/gpu/drm/vc4/vc4_kms.c @@ -61,7 +61,7 @@ vc4_atomic_complete_commit(struct vc4_commit *c)
drm_atomic_helper_cleanup_planes(dev, state);
- drm_atomic_state_free(state); + drm_atomic_state_put(state);
up(&vc4->async_modeset);
@@ -173,6 +173,7 @@ static int vc4_atomic_commit(struct drm_device *dev, * current layout. */
+ drm_atomic_state_get(state); if (nonblock) { vc4_queue_seqno_cb(dev, &c->cb, wait_seqno, vc4_atomic_complete_commit_seqno_cb); diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h index 856a9c85a838..1c6210e7a791 100644 --- a/include/drm/drm_atomic.h +++ b/include/drm/drm_atomic.h @@ -39,7 +39,33 @@ static inline void drm_crtc_commit_get(struct drm_crtc_commit *commit) struct drm_atomic_state * __must_check drm_atomic_state_alloc(struct drm_device *dev); void drm_atomic_state_clear(struct drm_atomic_state *state); -void drm_atomic_state_free(struct drm_atomic_state *state); + +/** + * drm_atomic_state_get - acquire a reference to the atomic state + * @state: The atomic state + * + * Returns a new reference to the @state + */ +static inline struct drm_atomic_state * +drm_atomic_state_get(struct drm_atomic_state *state) +{ + kref_get(&state->ref); + return state; +} + +void __drm_atomic_state_free(struct kref *ref); + +/** + * drm_atomic_state_put - release a reference to the atomic state + * @state: The atomic state + * + * This releases a reference to @state which is freed after removing the + * final reference. No locking required and callable from any context. + */ +static inline void drm_atomic_state_put(struct drm_atomic_state *state) +{ + kref_put(&state->ref, __drm_atomic_state_free); +}
int __must_check drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state); diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index 3d33c90da9e5..caf03ccaf77c 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -1291,6 +1291,7 @@ struct __drm_connnectors_state {
/** * struct drm_atomic_state - the global state object for atomic updates + * @ref: count of all references to this state * @dev: parent DRM device * @allow_modeset: allow full modeset * @legacy_cursor_update: hint to enforce legacy cursor IOCTL semantics @@ -1302,6 +1303,8 @@ struct __drm_connnectors_state { * @acquire_ctx: acquire context for this atomic modeset state update */ struct drm_atomic_state { + struct kref ref; + struct drm_device *dev; bool allow_modeset : 1; bool legacy_cursor_update : 1;