drivers/gpu/drm/nouveau/nvkm/subdev/fb/ram.c

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

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/fb/ram.c
Extension
.c
Size
6625 bytes
Lines
264
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_vram {
	struct nvkm_memory memory;
	struct nvkm_ram *ram;
	u8 page;
	struct nvkm_mm_node *mn;
};

static int
nvkm_vram_kmap(struct nvkm_memory *memory, struct nvkm_memory **pmemory)
{
	return nvkm_instobj_wrap(nvkm_vram(memory)->ram->fb->subdev.device, memory, pmemory);
}

static int
nvkm_vram_map(struct nvkm_memory *memory, u64 offset, struct nvkm_vmm *vmm,
	      struct nvkm_vma *vma, void *argv, u32 argc)
{
	struct nvkm_vram *vram = nvkm_vram(memory);
	struct nvkm_vmm_map map = {
		.memory = &vram->memory,
		.offset = offset,
		.mem = vram->mn,
	};

	return nvkm_vmm_map(vmm, vma, argv, argc, &map);
}

static u64
nvkm_vram_size(struct nvkm_memory *memory)
{
	return (u64)nvkm_mm_size(nvkm_vram(memory)->mn) << NVKM_RAM_MM_SHIFT;
}

static u64
nvkm_vram_addr(struct nvkm_memory *memory)
{
	struct nvkm_vram *vram = nvkm_vram(memory);
	if (!nvkm_mm_contiguous(vram->mn))
		return ~0ULL;
	return (u64)nvkm_mm_addr(vram->mn) << NVKM_RAM_MM_SHIFT;
}

static u8
nvkm_vram_page(struct nvkm_memory *memory)
{
	return nvkm_vram(memory)->page;
}

static enum nvkm_memory_target
nvkm_vram_target(struct nvkm_memory *memory)
{
	return NVKM_MEM_TARGET_VRAM;
}

static void *
nvkm_vram_dtor(struct nvkm_memory *memory)
{
	struct nvkm_vram *vram = nvkm_vram(memory);
	struct nvkm_mm_node *next = vram->mn;
	struct nvkm_mm_node *node;

	if (next) {
		if (likely(next->nl_entry.next)){
			mutex_lock(&vram->ram->mutex);
			while ((node = next)) {
				next = node->next;
				nvkm_mm_free(&vram->ram->vram, &node);
			}
			mutex_unlock(&vram->ram->mutex);
		} else {
			kfree(vram->mn);
		}
	}

	return vram;
}

static const struct nvkm_memory_func
nvkm_vram = {
	.dtor = nvkm_vram_dtor,
	.target = nvkm_vram_target,
	.page = nvkm_vram_page,
	.addr = nvkm_vram_addr,
	.size = nvkm_vram_size,
	.map = nvkm_vram_map,
	.kmap = nvkm_vram_kmap,
};

int
nvkm_ram_wrap(struct nvkm_device *device, u64 addr, u64 size,

Annotation

Implementation Notes