drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmnv50.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmnv50.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmnv50.c
Extension
.c
Size
9513 bytes
Lines
388
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

while (ptes--) {
			const u64 data = *map->dma++ + map->type;
			VMM_WO064(pt, vmm, ptei++ * 8, data);
			map->type += map->ctag;
		}
		nvkm_done(pt->memory);
		return;
	}

	VMM_MAP_ITER_DMA(vmm, pt, ptei, ptes, map, nv50_vmm_pgt_pte);
}

static void
nv50_vmm_pgt_mem(struct nvkm_vmm *vmm, struct nvkm_mmu_pt *pt,
		 u32 ptei, u32 ptes, struct nvkm_vmm_map *map)
{
	VMM_MAP_ITER_MEM(vmm, pt, ptei, ptes, map, nv50_vmm_pgt_pte);
}

static void
nv50_vmm_pgt_unmap(struct nvkm_vmm *vmm,
		   struct nvkm_mmu_pt *pt, u32 ptei, u32 ptes)
{
	VMM_FO064(pt, vmm, ptei * 8, 0ULL, ptes);
}

static const struct nvkm_vmm_desc_func
nv50_vmm_pgt = {
	.unmap = nv50_vmm_pgt_unmap,
	.mem = nv50_vmm_pgt_mem,
	.dma = nv50_vmm_pgt_dma,
	.sgl = nv50_vmm_pgt_sgl,
};

static bool
nv50_vmm_pde(struct nvkm_vmm *vmm, struct nvkm_vmm_pt *pgt, u64 *pdata)
{
	struct nvkm_mmu_pt *pt;
	u64 data = 0xdeadcafe00000000ULL;
	if (pgt && (pt = pgt->pt[0])) {
		switch (pgt->page) {
		case 16: data = 0x00000001; break;
		case 12: data = 0x00000003;
			switch (nvkm_memory_size(pt->memory)) {
			case 0x100000: data |= 0x00000000; break;
			case 0x040000: data |= 0x00000020; break;
			case 0x020000: data |= 0x00000040; break;
			case 0x010000: data |= 0x00000060; break;
			default:
				WARN_ON(1);
				return false;
			}
			break;
		default:
			WARN_ON(1);
			return false;
		}

		switch (nvkm_memory_target(pt->memory)) {
		case NVKM_MEM_TARGET_VRAM: data |= 0x00000000; break;
		case NVKM_MEM_TARGET_HOST: data |= 0x00000008; break;
		case NVKM_MEM_TARGET_NCOH: data |= 0x0000000c; break;
		default:
			WARN_ON(1);
			return false;
		}

		data |= pt->addr;
	}
	*pdata = data;
	return true;
}

static void
nv50_vmm_pgd_pde(struct nvkm_vmm *vmm, struct nvkm_vmm_pt *pgd, u32 pdei)
{
	struct nvkm_vmm_join *join;
	u32 pdeo = vmm->mmu->func->vmm.pd_offset + (pdei * 8);
	u64 data;

	if (!nv50_vmm_pde(vmm, pgd->pde[pdei], &data))
		return;

	list_for_each_entry(join, &vmm->join, head) {
		nvkm_kmap(join->inst);
		nvkm_wo64(join->inst, pdeo, data);
		nvkm_done(join->inst);
	}
}

Annotation

Implementation Notes