drivers/gpu/drm/radeon/radeon_semaphore.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/radeon/radeon_semaphore.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/radeon/radeon_semaphore.c
Extension
.c
Size
3216 bytes
Lines
107
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

#include "radeon.h"
#include "radeon_trace.h"

int radeon_semaphore_create(struct radeon_device *rdev,
			    struct radeon_semaphore **semaphore)
{
	int r;

	*semaphore = kmalloc_obj(struct radeon_semaphore);
	if (*semaphore == NULL) {
		return -ENOMEM;
	}
	r = radeon_sa_bo_new(&rdev->ring_tmp_bo,
			     &(*semaphore)->sa_bo, 8, 8);
	if (r) {
		kfree(*semaphore);
		*semaphore = NULL;
		return r;
	}
	(*semaphore)->waiters = 0;
	(*semaphore)->gpu_addr = radeon_sa_bo_gpu_addr((*semaphore)->sa_bo);

	*((uint64_t *)radeon_sa_bo_cpu_addr((*semaphore)->sa_bo)) = 0;

	return 0;
}

bool radeon_semaphore_emit_signal(struct radeon_device *rdev, int ridx,
				  struct radeon_semaphore *semaphore)
{
	struct radeon_ring *ring = &rdev->ring[ridx];

	trace_radeon_semaphore_signale(ridx, semaphore);

	if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, false)) {
		--semaphore->waiters;

		/* for debugging lockup only, used by sysfs debug files */
		ring->last_semaphore_signal_addr = semaphore->gpu_addr;
		return true;
	}
	return false;
}

bool radeon_semaphore_emit_wait(struct radeon_device *rdev, int ridx,
				struct radeon_semaphore *semaphore)
{
	struct radeon_ring *ring = &rdev->ring[ridx];

	trace_radeon_semaphore_wait(ridx, semaphore);

	if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, true)) {
		++semaphore->waiters;

		/* for debugging lockup only, used by sysfs debug files */
		ring->last_semaphore_wait_addr = semaphore->gpu_addr;
		return true;
	}
	return false;
}

void radeon_semaphore_free(struct radeon_device *rdev,
			   struct radeon_semaphore **semaphore,
			   struct radeon_fence *fence)
{
	if (semaphore == NULL || *semaphore == NULL) {
		return;
	}
	if ((*semaphore)->waiters > 0) {
		dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
			" hardware lockup imminent!\n", *semaphore);
	}
	radeon_sa_bo_free(&(*semaphore)->sa_bo, fence);
	kfree(*semaphore);
	*semaphore = NULL;
}

Annotation

Implementation Notes