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.
- 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.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
amdgpu.hamdgpu_lsdma.h
Detected Declarations
function filesfunction amdgpu_lsdma_copy_memfunction amdgpu_lsdma_fill_mem
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
- Immediate include surface: `amdgpu.h`, `amdgpu_lsdma.h`.
- Detected declarations: `function files`, `function amdgpu_lsdma_copy_mem`, `function amdgpu_lsdma_fill_mem`.
- Atlas domain: Driver Families / drivers/gpu.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.