drivers/gpu/drm/nouveau/nvkm/core/gpuobj.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/core/gpuobj.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/core/gpuobj.c
Extension
.c
Size
7275 bytes
Lines
279
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 (align >= 0) {
			ret = nvkm_mm_head(&parent->heap, 0, 1, size, size,
					   max(align, 1), &gpuobj->node);
		} else {
			ret = nvkm_mm_tail(&parent->heap, 0, 1, size, size,
					   -align, &gpuobj->node);
		}
		if (ret)
			return ret;

		gpuobj->parent = parent;
		gpuobj->func = &nvkm_gpuobj_func;
		gpuobj->addr = parent->addr + gpuobj->node->offset;
		gpuobj->size = gpuobj->node->length;

		if (zero) {
			nvkm_kmap(gpuobj);
			for (offset = 0; offset < gpuobj->size; offset += 4)
				nvkm_wo32(gpuobj, offset, 0x00000000);
			nvkm_done(gpuobj);
		}
	} else {
		ret = nvkm_memory_new(device, NVKM_MEM_TARGET_INST, size,
				      abs(align), zero, &gpuobj->memory);
		if (ret)
			return ret;

		gpuobj->func = &nvkm_gpuobj_heap;
		gpuobj->addr = nvkm_memory_addr(gpuobj->memory);
		gpuobj->size = nvkm_memory_size(gpuobj->memory);
	}

	return nvkm_mm_init(&gpuobj->heap, 0, 0, gpuobj->size, 1);
}

void
nvkm_gpuobj_del(struct nvkm_gpuobj **pgpuobj)
{
	struct nvkm_gpuobj *gpuobj = *pgpuobj;
	if (gpuobj) {
		if (gpuobj->parent)
			nvkm_mm_free(&gpuobj->parent->heap, &gpuobj->node);
		nvkm_mm_fini(&gpuobj->heap);
		nvkm_memory_unref(&gpuobj->memory);
		kfree(*pgpuobj);
		*pgpuobj = NULL;
	}
}

int
nvkm_gpuobj_new(struct nvkm_device *device, u32 size, int align, bool zero,
		struct nvkm_gpuobj *parent, struct nvkm_gpuobj **pgpuobj)
{
	struct nvkm_gpuobj *gpuobj;
	int ret;

	if (!(gpuobj = *pgpuobj = kzalloc_obj(*gpuobj)))
		return -ENOMEM;

	ret = nvkm_gpuobj_ctor(device, size, align, zero, parent, gpuobj);
	if (ret)
		nvkm_gpuobj_del(pgpuobj);
	return ret;
}

/* the below is basically only here to support sharing the paged dma object
 * for PCI(E)GART on <=nv4x chipsets, and should *not* be expected to work
 * anywhere else.
 */

int
nvkm_gpuobj_wrap(struct nvkm_memory *memory, struct nvkm_gpuobj **pgpuobj)
{
	if (!(*pgpuobj = kzalloc_obj(**pgpuobj)))
		return -ENOMEM;

	(*pgpuobj)->addr = nvkm_memory_addr(memory);
	(*pgpuobj)->size = nvkm_memory_size(memory);
	return 0;
}

void
nvkm_gpuobj_memcpy_to(struct nvkm_gpuobj *dst, u32 dstoffset, void *src,
		      u32 length)
{
	int i;

	for (i = 0; i < length; i += 4)
		nvkm_wo32(dst, dstoffset + i, *(u32 *)(src + i));
}

Annotation

Implementation Notes