summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/drm_modeset_lock.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2014-10-14 09:39:08 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2014-10-14 09:39:08 +0200
commit2d65a9f48fcdf7866aab6457bc707ca233e0c791 (patch)
treef93e5838d6ac2e59434367f4ff905f7d9c45fc2b /drivers/gpu/drm/drm_modeset_lock.c
parentda92da3638a04894afdca8b99e973ddd20268471 (diff)
parentdfda0df3426483cf5fc7441f23f318edbabecb03 (diff)
downloadlinux-2d65a9f48fcdf7866aab6457bc707ca233e0c791.tar.gz
linux-2d65a9f48fcdf7866aab6457bc707ca233e0c791.tar.bz2
linux-2d65a9f48fcdf7866aab6457bc707ca233e0c791.zip
Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux
Pull drm updates from Dave Airlie: "This is the main git pull for the drm, I pretty much froze major pulls at -rc5/6 time, and haven't had much fallout, so will probably continue doing that. Lots of changes all over, big internal header cleanup to make it clear drm features are legacy things and what are things that modern KMS drivers should be using. Also big move to use the new generic fences in all the TTM drivers. core: atomic prep work, vblank rework changes, allows immediate vblank disables major header reworking and cleanups to better delinate legacy interfaces from what KMS drivers should be using. cursor planes locking fixes ttm: move to generic fences (affects all TTM drivers) ppc64 caching fixes radeon: userptr support, uvd for old asics, reset rework for fence changes better buffer placement changes, dpm feature enablement hdmi audio support fixes intel: Cherryview work, 180 degree rotation, skylake prep work, execlist command submission full ppgtt prep work cursor improvements edid caching, vdd handling improvements nouveau: fence reworking kepler memory clock work gt21x clock work fan control improvements hdmi infoframe fixes DP audio ast: ppc64 fixes caching fix rcar: rcar-du DT support ipuv3: prep work for capture support msm: LVDS support for mdp4, new panel, gpu refactoring exynos: exynos3250 SoC support, drop bad mmap interface, mipi dsi changes, and component match support" * 'drm-next' of git://people.freedesktop.org/~airlied/linux: (640 commits) drm/mst: rework payload table allocation to conform better. drm/ast: Fix HW cursor image drm/radeon/kv: add uvd/vce info to dpm debugfs output drm/radeon/ci: add uvd/vce info to dpm debugfs output drm/radeon: export reservation_object from dmabuf to ttm drm/radeon: cope with foreign fences inside the reservation object drm/radeon: cope with foreign fences inside display drm/core: use helper to check driver features drm/radeon/cik: write gfx ucode version to ucode addr reg drm/radeon/si: print full CS when we hit a packet 0 drm/radeon: remove unecessary includes drm/radeon/combios: declare legacy_connector_convert as static drm/radeon/atombios: declare connector convert tables as static drm/radeon: drop btc_get_max_clock_from_voltage_dependency_table drm/radeon/dpm: drop clk/voltage dependency filters for BTC drm/radeon/dpm: drop clk/voltage dependency filters for CI drm/radeon/dpm: drop clk/voltage dependency filters for SI drm/radeon/dpm: drop clk/voltage dependency filters for NI drm/radeon: disable audio when we disable hdmi (v2) drm/radeon: split audio enable between eg and r600 (v2) ...
Diffstat (limited to 'drivers/gpu/drm/drm_modeset_lock.c')
-rw-r--r--drivers/gpu/drm/drm_modeset_lock.c213
1 files changed, 212 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_modeset_lock.c b/drivers/gpu/drm/drm_modeset_lock.c
index 3a02e5e3e9f3..474e4d12a2d8 100644
--- a/drivers/gpu/drm/drm_modeset_lock.c
+++ b/drivers/gpu/drm/drm_modeset_lock.c
@@ -57,6 +57,212 @@
/**
+ * __drm_modeset_lock_all - internal helper to grab all modeset locks
+ * @dev: DRM device
+ * @trylock: trylock mode for atomic contexts
+ *
+ * This is a special version of drm_modeset_lock_all() which can also be used in
+ * atomic contexts. Then @trylock must be set to true.
+ *
+ * Returns:
+ * 0 on success or negative error code on failure.
+ */
+int __drm_modeset_lock_all(struct drm_device *dev,
+ bool trylock)
+{
+ struct drm_mode_config *config = &dev->mode_config;
+ struct drm_modeset_acquire_ctx *ctx;
+ int ret;
+
+ ctx = kzalloc(sizeof(*ctx),
+ trylock ? GFP_ATOMIC : GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ if (trylock) {
+ if (!mutex_trylock(&config->mutex))
+ return -EBUSY;
+ } else {
+ mutex_lock(&config->mutex);
+ }
+
+ drm_modeset_acquire_init(ctx, 0);
+ ctx->trylock_only = trylock;
+
+retry:
+ ret = drm_modeset_lock(&config->connection_mutex, ctx);
+ if (ret)
+ goto fail;
+ ret = drm_modeset_lock_all_crtcs(dev, ctx);
+ if (ret)
+ goto fail;
+
+ WARN_ON(config->acquire_ctx);
+
+ /* now we hold the locks, so now that it is safe, stash the
+ * ctx for drm_modeset_unlock_all():
+ */
+ config->acquire_ctx = ctx;
+
+ drm_warn_on_modeset_not_all_locked(dev);
+
+ return 0;
+
+fail:
+ if (ret == -EDEADLK) {
+ drm_modeset_backoff(ctx);
+ goto retry;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(__drm_modeset_lock_all);
+
+/**
+ * drm_modeset_lock_all - take all modeset locks
+ * @dev: drm device
+ *
+ * This function takes all modeset locks, suitable where a more fine-grained
+ * scheme isn't (yet) implemented. Locks must be dropped with
+ * drm_modeset_unlock_all.
+ */
+void drm_modeset_lock_all(struct drm_device *dev)
+{
+ WARN_ON(__drm_modeset_lock_all(dev, false) != 0);
+}
+EXPORT_SYMBOL(drm_modeset_lock_all);
+
+/**
+ * drm_modeset_unlock_all - drop all modeset locks
+ * @dev: device
+ *
+ * This function drop all modeset locks taken by drm_modeset_lock_all.
+ */
+void drm_modeset_unlock_all(struct drm_device *dev)
+{
+ struct drm_mode_config *config = &dev->mode_config;
+ struct drm_modeset_acquire_ctx *ctx = config->acquire_ctx;
+
+ if (WARN_ON(!ctx))
+ return;
+
+ config->acquire_ctx = NULL;
+ drm_modeset_drop_locks(ctx);
+ drm_modeset_acquire_fini(ctx);
+
+ kfree(ctx);
+
+ mutex_unlock(&dev->mode_config.mutex);
+}
+EXPORT_SYMBOL(drm_modeset_unlock_all);
+
+/**
+ * drm_modeset_lock_crtc - lock crtc with hidden acquire ctx
+ * @crtc: drm crtc
+ *
+ * This function locks the given crtc using a hidden acquire context. This is
+ * necessary so that drivers internally using the atomic interfaces can grab
+ * further locks with the lock acquire context.
+ */
+void drm_modeset_lock_crtc(struct drm_crtc *crtc)
+{
+ struct drm_modeset_acquire_ctx *ctx;
+ int ret;
+
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (WARN_ON(!ctx))
+ return;
+
+ drm_modeset_acquire_init(ctx, 0);
+
+retry:
+ ret = drm_modeset_lock(&crtc->mutex, ctx);
+ if (ret)
+ goto fail;
+
+ WARN_ON(crtc->acquire_ctx);
+
+ /* now we hold the locks, so now that it is safe, stash the
+ * ctx for drm_modeset_unlock_crtc():
+ */
+ crtc->acquire_ctx = ctx;
+
+ return;
+
+fail:
+ if (ret == -EDEADLK) {
+ drm_modeset_backoff(ctx);
+ goto retry;
+ }
+}
+EXPORT_SYMBOL(drm_modeset_lock_crtc);
+
+/**
+ * drm_modeset_legacy_acquire_ctx - find acquire ctx for legacy ioctls
+ * @crtc: drm crtc
+ *
+ * Legacy ioctl operations like cursor updates or page flips only have per-crtc
+ * locking, and store the acquire ctx in the corresponding crtc. All other
+ * legacy operations take all locks and use a global acquire context. This
+ * function grabs the right one.
+ */
+struct drm_modeset_acquire_ctx *
+drm_modeset_legacy_acquire_ctx(struct drm_crtc *crtc)
+{
+ if (crtc->acquire_ctx)
+ return crtc->acquire_ctx;
+
+ WARN_ON(!crtc->dev->mode_config.acquire_ctx);
+
+ return crtc->dev->mode_config.acquire_ctx;
+}
+EXPORT_SYMBOL(drm_modeset_legacy_acquire_ctx);
+
+/**
+ * drm_modeset_unlock_crtc - drop crtc lock
+ * @crtc: drm crtc
+ *
+ * This drops the crtc lock acquire with drm_modeset_lock_crtc() and all other
+ * locks acquired through the hidden context.
+ */
+void drm_modeset_unlock_crtc(struct drm_crtc *crtc)
+{
+ struct drm_modeset_acquire_ctx *ctx = crtc->acquire_ctx;
+
+ if (WARN_ON(!ctx))
+ return;
+
+ crtc->acquire_ctx = NULL;
+ drm_modeset_drop_locks(ctx);
+ drm_modeset_acquire_fini(ctx);
+
+ kfree(ctx);
+}
+EXPORT_SYMBOL(drm_modeset_unlock_crtc);
+
+/**
+ * drm_warn_on_modeset_not_all_locked - check that all modeset locks are locked
+ * @dev: device
+ *
+ * Useful as a debug assert.
+ */
+void drm_warn_on_modeset_not_all_locked(struct drm_device *dev)
+{
+ struct drm_crtc *crtc;
+
+ /* Locking is currently fubar in the panic handler. */
+ if (oops_in_progress)
+ return;
+
+ list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
+ WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
+
+ WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
+ WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
+}
+EXPORT_SYMBOL(drm_warn_on_modeset_not_all_locked);
+
+/**
* drm_modeset_acquire_init - initialize acquire context
* @ctx: the acquire context
* @flags: for future
@@ -108,7 +314,12 @@ static inline int modeset_lock(struct drm_modeset_lock *lock,
WARN_ON(ctx->contended);
- if (interruptible && slow) {
+ if (ctx->trylock_only) {
+ if (!ww_mutex_trylock(&lock->mutex))
+ return -EBUSY;
+ else
+ return 0;
+ } else if (interruptible && slow) {
ret = ww_mutex_lock_slow_interruptible(&lock->mutex, &ctx->ww_ctx);
} else if (interruptible) {
ret = ww_mutex_lock_interruptible(&lock->mutex, &ctx->ww_ctx);