diff options
| author |   Chris Wilson <chris@chris-wilson.co.uk> | 2020-07-31 09:50:11 +0100 |
|---|---|---|
| committer |   Joonas Lahtinen <joonas.lahtinen@linux.intel.com> | 2020-09-07 13:18:17 +0300 |
| commit | 5d9341370f57c058a8d880490ba9e79e761b2d7a (patch) | |
| tree | af033d780148d8999233d5945f36ade38fd75769 /drivers/gpu/drm/i915/i915_active.h | |
| parent | drm/i915: Skip taking acquire mutex for no ref->active callback (diff) | |
| download | linux-dev-5d9341370f57c058a8d880490ba9e79e761b2d7a.tar.xz linux-dev-5d9341370f57c058a8d880490ba9e79e761b2d7a.zip | |
drm/i915: Export a preallocate variant of i915_active_acquire()
Sometimes we have to be very careful not to allocate underneath a mutex
(or spinlock) and yet still want to track activity. Enter
i915_active_acquire_for_context(). This raises the activity counter on
i915_active prior to use and ensures that the fence-tree contains a slot
for the context.
v2: Refactor active_lookup() so it can be called again before/after
locking to resolve contention. Since we protect the rbtree until we
idle, we can do a lockfree lookup, with the caveat that if another
thread performs a concurrent insertion, the rotations from the insert
may cause us to not find our target. A second pass holding the treelock
will find the target if it exists, or the place to perform our
insertion.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Thomas Hellström <thomas.hellstrom@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200731085015.32368-3-chris@chris-wilson.co.uk
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_active.h')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_active.h | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/gpu/drm/i915/i915_active.h b/drivers/gpu/drm/i915/i915_active.h index cf4058150966..73ded3c52a04 100644 --- a/drivers/gpu/drm/i915/i915_active.h +++ b/drivers/gpu/drm/i915/i915_active.h @@ -163,14 +163,16 @@ void __i915_active_init(struct i915_active *ref, __i915_active_init(ref, active, retire, &__mkey, &__wkey); \ } while (0) -int i915_active_ref(struct i915_active *ref, - struct intel_timeline *tl, - struct dma_fence *fence); +struct dma_fence * +__i915_active_ref(struct i915_active *ref, u64 idx, struct dma_fence *fence); +int i915_active_ref(struct i915_active *ref, u64 idx, struct dma_fence *fence); static inline int i915_active_add_request(struct i915_active *ref, struct i915_request *rq) { - return i915_active_ref(ref, i915_request_timeline(rq), &rq->fence); + return i915_active_ref(ref, + i915_request_timeline(rq)->fence_context, + &rq->fence); } struct dma_fence * @@ -198,7 +200,9 @@ int i915_request_await_active(struct i915_request *rq, #define I915_ACTIVE_AWAIT_BARRIER BIT(2) int i915_active_acquire(struct i915_active *ref); +int i915_active_acquire_for_context(struct i915_active *ref, u64 idx); bool i915_active_acquire_if_busy(struct i915_active *ref); + void i915_active_release(struct i915_active *ref); static inline void __i915_active_acquire(struct i915_active *ref) |