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

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

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/mmu/ummu.c
Extension
.c
Size
4835 bytes
Lines
182
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

if (index-- == 0) {
			oclass->base = mmu->func->mem.user;
			oclass->ctor = nvkm_umem_new;
			return 0;
		}
	}

	if (mmu->func->vmm.user.oclass) {
		if (index-- == 0) {
			oclass->base = mmu->func->vmm.user;
			oclass->ctor = nvkm_uvmm_new;
			return 0;
		}
	}

	return -EINVAL;
}

static int
nvkm_ummu_heap(struct nvkm_ummu *ummu, void *argv, u32 argc)
{
	struct nvkm_mmu *mmu = ummu->mmu;
	union {
		struct nvif_mmu_heap_v0 v0;
	} *args = argv;
	int ret = -ENOSYS;
	u8 index;

	if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, false))) {
		if ((index = args->v0.index) >= mmu->heap_nr)
			return -EINVAL;
		args->v0.size = mmu->heap[index].size;
	} else
		return ret;

	return 0;
}

static int
nvkm_ummu_type(struct nvkm_ummu *ummu, void *argv, u32 argc)
{
	struct nvkm_mmu *mmu = ummu->mmu;
	union {
		struct nvif_mmu_type_v0 v0;
	} *args = argv;
	int ret = -ENOSYS;
	u8 type, index;

	if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, false))) {
		if ((index = args->v0.index) >= mmu->type_nr)
			return -EINVAL;
		type = mmu->type[index].type;
		args->v0.heap = mmu->type[index].heap;
		args->v0.vram = !!(type & NVKM_MEM_VRAM);
		args->v0.host = !!(type & NVKM_MEM_HOST);
		args->v0.comp = !!(type & NVKM_MEM_COMP);
		args->v0.disp = !!(type & NVKM_MEM_DISP);
		args->v0.kind = !!(type & NVKM_MEM_KIND);
		args->v0.mappable = !!(type & NVKM_MEM_MAPPABLE);
		args->v0.coherent = !!(type & NVKM_MEM_COHERENT);
		args->v0.uncached = !!(type & NVKM_MEM_UNCACHED);
	} else
		return ret;

	return 0;
}

static int
nvkm_ummu_kind(struct nvkm_ummu *ummu, void *argv, u32 argc)
{
	struct nvkm_mmu *mmu = ummu->mmu;
	union {
		struct nvif_mmu_kind_v0 v0;
	} *args = argv;
	const u8 *kind = NULL;
	int ret = -ENOSYS, count = 0;
	u8 kind_inv = 0;

	if (mmu->func->kind)
		kind = mmu->func->kind(mmu, &count, &kind_inv);

	if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, true))) {
		if (argc != args->v0.count * sizeof(*args->v0.data))
			return -EINVAL;
		if (args->v0.count > count)
			return -EINVAL;
		args->v0.kind_inv = kind_inv;
		memcpy(args->v0.data, kind, args->v0.count);
	} else
		return ret;

Annotation

Implementation Notes