drivers/gpu/drm/nouveau/nvkm/subdev/mmu/mem.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/mem.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/mmu/mem.c
Extension
.c
Size
5964 bytes
Lines
243
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 nvkm_mem {
	struct nvkm_memory memory;
	enum nvkm_memory_target target;
	struct nvkm_mmu *mmu;
	u64 pages;
	struct page **mem;
	union {
		struct scatterlist *sgl;
		dma_addr_t *dma;
	};
};

static enum nvkm_memory_target
nvkm_mem_target(struct nvkm_memory *memory)
{
	return nvkm_mem(memory)->target;
}

static u8
nvkm_mem_page(struct nvkm_memory *memory)
{
	return PAGE_SHIFT;
}

static u64
nvkm_mem_addr(struct nvkm_memory *memory)
{
	struct nvkm_mem *mem = nvkm_mem(memory);
	if (mem->pages == 1 && mem->mem)
		return mem->dma[0];
	return ~0ULL;
}

static u64
nvkm_mem_size(struct nvkm_memory *memory)
{
	return nvkm_mem(memory)->pages << PAGE_SHIFT;
}

static int
nvkm_mem_map_dma(struct nvkm_memory *memory, u64 offset, struct nvkm_vmm *vmm,
		 struct nvkm_vma *vma, void *argv, u32 argc)
{
	struct nvkm_mem *mem = nvkm_mem(memory);
	struct nvkm_vmm_map map = {
		.memory = &mem->memory,
		.offset = offset,
		.dma = mem->dma,
	};
	return nvkm_vmm_map(vmm, vma, argv, argc, &map);
}

static void *
nvkm_mem_dtor(struct nvkm_memory *memory)
{
	struct nvkm_mem *mem = nvkm_mem(memory);
	if (mem->mem) {
		while (mem->pages--) {
			dma_unmap_page(mem->mmu->subdev.device->dev,
				       mem->dma[mem->pages], PAGE_SIZE,
				       DMA_BIDIRECTIONAL);
			__free_page(mem->mem[mem->pages]);
		}
		kvfree(mem->dma);
		kvfree(mem->mem);
	}
	return mem;
}

static const struct nvkm_memory_func
nvkm_mem_dma = {
	.dtor = nvkm_mem_dtor,
	.target = nvkm_mem_target,
	.page = nvkm_mem_page,
	.addr = nvkm_mem_addr,
	.size = nvkm_mem_size,
	.map = nvkm_mem_map_dma,
};

static int
nvkm_mem_map_sgl(struct nvkm_memory *memory, u64 offset, struct nvkm_vmm *vmm,
		 struct nvkm_vma *vma, void *argv, u32 argc)
{
	struct nvkm_mem *mem = nvkm_mem(memory);
	struct nvkm_vmm_map map = {
		.memory = &mem->memory,
		.offset = offset,
		.sgl = mem->sgl,
	};
	return nvkm_vmm_map(vmm, vma, argv, argc, &map);

Annotation

Implementation Notes