drivers/gpu/drm/nouveau/nvkm/subdev/gsp/rm/r535/vmm.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/rm/r535/vmm.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/gsp/rm/r535/vmm.c
Extension
.c
Size
5383 bytes
Lines
192
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 (!IS_ERR(ctrl)) {
			ctrl->hVASpace = vmm->rm.object.handle;

			WARN_ON(nvkm_gsp_rm_ctrl_wr(&vmm->rm.device.object, ctrl));
		}

		vmm->rm.external = false;
	}

	nvkm_gsp_rm_free(&vmm->rm.object);
	nvkm_gsp_device_dtor(&vmm->rm.device);
	nvkm_gsp_client_dtor(&vmm->rm.client);

	nvkm_vmm_put(vmm, &vmm->rm.rsvd);
}

int
r535_mmu_vaspace_new(struct nvkm_vmm *vmm, u32 handle, bool external)
{
	NV_VASPACE_ALLOCATION_PARAMETERS *args;
	int ret;

	ret = nvkm_gsp_client_device_ctor(vmm->mmu->subdev.device->gsp,
					  &vmm->rm.client, &vmm->rm.device);
	if (ret)
		return ret;

	args = nvkm_gsp_rm_alloc_get(&vmm->rm.device.object, handle, FERMI_VASPACE_A,
				     sizeof(*args), &vmm->rm.object);
	if (IS_ERR(args))
		return PTR_ERR(args);

	args->index = NV_VASPACE_ALLOCATION_INDEX_GPU_NEW;
	if (external)
		args->flags = NV_VASPACE_ALLOCATION_FLAGS_IS_EXTERNALLY_OWNED;

	ret = nvkm_gsp_rm_alloc_wr(&vmm->rm.object, args);
	if (ret)
		return ret;

	if (!external) {
		NV90F1_CTRL_VASPACE_COPY_SERVER_RESERVED_PDES_PARAMS *ctrl;
		u8 page_shift = 29; /* 512MiB */
		const u64 page_size = BIT_ULL(page_shift);
		const struct nvkm_vmm_page *page;
		const struct nvkm_vmm_desc *desc;
		struct nvkm_vmm_pt *pd = vmm->pd;

		for (page = vmm->func->page; page->shift; page++) {
			if (page->shift == page_shift)
				break;
		}

		if (WARN_ON(!page->shift))
			return -EINVAL;

		mutex_lock(&vmm->mutex.vmm);
		ret = nvkm_vmm_get_locked(vmm, true, false, false, page_shift, 32, page_size,
					  &vmm->rm.rsvd);
		mutex_unlock(&vmm->mutex.vmm);
		if (ret)
			return ret;

		/* Some parts of RM expect the server-reserved area to be in a specific location. */
		if (WARN_ON(vmm->rm.rsvd->addr != SPLIT_VAS_SERVER_RM_MANAGED_VA_START ||
			    vmm->rm.rsvd->size != SPLIT_VAS_SERVER_RM_MANAGED_VA_SIZE))
			return -EINVAL;

		ctrl = nvkm_gsp_rm_ctrl_get(&vmm->rm.object,
					    NV90F1_CTRL_CMD_VASPACE_COPY_SERVER_RESERVED_PDES,
					    sizeof(*ctrl));
		if (IS_ERR(ctrl))
			return PTR_ERR(ctrl);

		ctrl->pageSize = page_size;
		ctrl->virtAddrLo = vmm->rm.rsvd->addr;
		ctrl->virtAddrHi = vmm->rm.rsvd->addr + vmm->rm.rsvd->size - 1;

		for (desc = page->desc; desc->bits; desc++) {
			ctrl->numLevelsToCopy++;
			page_shift += desc->bits;
		}
		desc--;

		for (int i = 0; i < ctrl->numLevelsToCopy; i++, desc--) {
			page_shift -= desc->bits;

			ctrl->levels[i].physAddress = pd->pt[0]->addr;
			ctrl->levels[i].size = BIT_ULL(desc->bits) * desc->size;
			ctrl->levels[i].aperture = 1;

Annotation

Implementation Notes