drivers/gpu/drm/radeon/uvd_v3_1.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/radeon/uvd_v3_1.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/radeon/uvd_v3_1.c
Extension
.c
Size
2098 bytes
Lines
57
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_asic.h"
#include "nid.h"

/**
 * uvd_v3_1_semaphore_emit - emit semaphore command
 *
 * @rdev: radeon_device pointer
 * @ring: radeon_ring pointer
 * @semaphore: semaphore to emit commands for
 * @emit_wait: true if we should emit a wait command
 *
 * Emit a semaphore command (either wait or signal) to the UVD ring.
 */
bool uvd_v3_1_semaphore_emit(struct radeon_device *rdev,
			     struct radeon_ring *ring,
			     struct radeon_semaphore *semaphore,
			     bool emit_wait)
{
	uint64_t addr = semaphore->gpu_addr;

	radeon_ring_write(ring, PACKET0(UVD_SEMA_ADDR_LOW, 0));
	radeon_ring_write(ring, (addr >> 3) & 0x000FFFFF);

	radeon_ring_write(ring, PACKET0(UVD_SEMA_ADDR_HIGH, 0));
	radeon_ring_write(ring, (addr >> 23) & 0x000FFFFF);

	radeon_ring_write(ring, PACKET0(UVD_SEMA_CMD, 0));
	radeon_ring_write(ring, 0x80 | (emit_wait ? 1 : 0));

	return true;
}

Annotation

Implementation Notes