drivers/gpu/drm/amd/amdgpu/amdgpu_lsdma.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/amd/amdgpu/amdgpu_lsdma.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/amd/amdgpu/amdgpu_lsdma.c
Extension
.c
Size
2475 bytes
Lines
92
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 "amdgpu.h"
#include "amdgpu_lsdma.h"

#define AMDGPU_LSDMA_MAX_SIZE	0x2000000ULL

int amdgpu_lsdma_wait_for(struct amdgpu_device *adev,
			  uint32_t reg_index, uint32_t reg_val,
			  uint32_t mask)
{
	uint32_t val;
	int i;

	for (i = 0; i < adev->usec_timeout; i++) {
		val = RREG32(reg_index);
		if ((val & mask) == reg_val)
			return 0;
		udelay(1);
	}

	return -ETIME;
}

int amdgpu_lsdma_copy_mem(struct amdgpu_device *adev,
			  uint64_t src_addr,
			  uint64_t dst_addr,
			  uint64_t mem_size)
{
	int ret;

	if (mem_size == 0)
		return -EINVAL;

	while (mem_size > 0) {
		uint64_t current_copy_size = min(mem_size, AMDGPU_LSDMA_MAX_SIZE);

		ret = adev->lsdma.funcs->copy_mem(adev, src_addr, dst_addr, current_copy_size);
		if (ret)
			return ret;
		src_addr += current_copy_size;
		dst_addr += current_copy_size;
		mem_size -= current_copy_size;
	}

	return 0;
}

int amdgpu_lsdma_fill_mem(struct amdgpu_device *adev,
			  uint64_t dst_addr,
			  uint32_t data,
			  uint64_t mem_size)
{
	int ret;

	if (mem_size == 0)
		return -EINVAL;

	while (mem_size > 0) {
		uint64_t current_fill_size = min(mem_size, AMDGPU_LSDMA_MAX_SIZE);

		ret = adev->lsdma.funcs->fill_mem(adev, dst_addr, data, current_fill_size);
		if (ret)
			return ret;
		dst_addr += current_fill_size;
		mem_size -= current_fill_size;
	}

	return 0;
}

Annotation

Implementation Notes