drivers/gpu/drm/i915/i915_sw_fence.h

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/i915/i915_sw_fence.h

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/i915/i915_sw_fence.h
Extension
.h
Size
3142 bytes
Lines
124
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct i915_sw_fence {
	wait_queue_head_t wait;
	i915_sw_fence_notify_t fn;
#ifdef CONFIG_DRM_I915_SW_FENCE_CHECK_DAG
	unsigned long flags;
#endif
	atomic_t pending;
	int error;
};

#define I915_SW_FENCE_CHECKED_BIT	0 /* used internally for DAG checking */

void __i915_sw_fence_init(struct i915_sw_fence *fence,
			  i915_sw_fence_notify_t fn,
			  const char *name,
			  struct lock_class_key *key);
#ifdef CONFIG_LOCKDEP
#define i915_sw_fence_init(fence, fn)				\
do {								\
	static struct lock_class_key __key;			\
								\
	BUILD_BUG_ON((fn) == NULL);				\
	__i915_sw_fence_init((fence), (fn), #fence, &__key);	\
} while (0)
#else
#define i915_sw_fence_init(fence, fn)				\
do {								\
	BUILD_BUG_ON((fn) == NULL);				\
	__i915_sw_fence_init((fence), (fn), NULL, NULL);	\
} while (0)
#endif

void i915_sw_fence_reinit(struct i915_sw_fence *fence);

#ifdef CONFIG_DRM_I915_SW_FENCE_DEBUG_OBJECTS
void i915_sw_fence_fini(struct i915_sw_fence *fence);
#else
static inline void i915_sw_fence_fini(struct i915_sw_fence *fence) {}
#endif

void i915_sw_fence_commit(struct i915_sw_fence *fence);

int i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence,
				 struct i915_sw_fence *after,
				 wait_queue_entry_t *wq);
int i915_sw_fence_await_sw_fence_gfp(struct i915_sw_fence *fence,
				     struct i915_sw_fence *after,
				     gfp_t gfp);

struct i915_sw_dma_fence_cb {
	struct dma_fence_cb base;
	struct i915_sw_fence *fence;
};

int __i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence,
				    struct dma_fence *dma,
				    struct i915_sw_dma_fence_cb *cb);
int i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence,
				  struct dma_fence *dma,
				  unsigned long timeout,
				  gfp_t gfp);

int i915_sw_fence_await_reservation(struct i915_sw_fence *fence,
				    struct dma_resv *resv,
				    bool write,
				    unsigned long timeout,
				    gfp_t gfp);

bool i915_sw_fence_await(struct i915_sw_fence *fence);
void i915_sw_fence_complete(struct i915_sw_fence *fence);

static inline bool i915_sw_fence_signaled(const struct i915_sw_fence *fence)
{
	return atomic_read(&fence->pending) <= 0;
}

static inline bool i915_sw_fence_done(const struct i915_sw_fence *fence)
{
	return atomic_read(&fence->pending) < 0;
}

static inline void i915_sw_fence_wait(struct i915_sw_fence *fence)
{
	wait_event(fence->wait, i915_sw_fence_done(fence));
}

static inline void
i915_sw_fence_set_error_once(struct i915_sw_fence *fence, int error)
{
	if (unlikely(error))

Annotation

Implementation Notes