drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmnv04.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmnv04.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmnv04.c
Extension
.c
Size
3875 bytes
Lines
142
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

#include "vmm.h"

#include <nvif/if000d.h>
#include <nvif/unpack.h>

static inline void
nv04_vmm_pgt_pte(struct nvkm_vmm *vmm, struct nvkm_mmu_pt *pt,
		 u32 ptei, u32 ptes, struct nvkm_vmm_map *map, u64 addr)
{
	u32 data = addr | 0x00000003; /* PRESENT, RW. */
	while (ptes--) {
		VMM_WO032(pt, vmm, 8 + ptei++ * 4, data);
		data += 0x00001000;
	}
}

static void
nv04_vmm_pgt_sgl(struct nvkm_vmm *vmm, struct nvkm_mmu_pt *pt,
		 u32 ptei, u32 ptes, struct nvkm_vmm_map *map)
{
	VMM_MAP_ITER_SGL(vmm, pt, ptei, ptes, map, nv04_vmm_pgt_pte);
}

static void
nv04_vmm_pgt_dma(struct nvkm_vmm *vmm, struct nvkm_mmu_pt *pt,
		 u32 ptei, u32 ptes, struct nvkm_vmm_map *map)
{
#if PAGE_SHIFT == 12
	nvkm_kmap(pt->memory);
	while (ptes--)
		VMM_WO032(pt, vmm, 8 + (ptei++ * 4), *map->dma++ | 0x00000003);
	nvkm_done(pt->memory);
#else
	VMM_MAP_ITER_DMA(vmm, pt, ptei, ptes, map, nv04_vmm_pgt_pte);
#endif
}

static void
nv04_vmm_pgt_unmap(struct nvkm_vmm *vmm,
		   struct nvkm_mmu_pt *pt, u32 ptei, u32 ptes)
{
	VMM_FO032(pt, vmm, 8 + (ptei * 4), 0, ptes);
}

static const struct nvkm_vmm_desc_func
nv04_vmm_desc_pgt = {
	.unmap = nv04_vmm_pgt_unmap,
	.dma = nv04_vmm_pgt_dma,
	.sgl = nv04_vmm_pgt_sgl,
};

static const struct nvkm_vmm_desc
nv04_vmm_desc_12[] = {
	{ PGT, 15, 4, 0x1000, &nv04_vmm_desc_pgt },
	{}
};

int
nv04_vmm_valid(struct nvkm_vmm *vmm, void *argv, u32 argc,
	       struct nvkm_vmm_map *map)
{
	union {
		struct nv04_vmm_map_vn vn;
	} *args = argv;
	int ret = -ENOSYS;
	if ((ret = nvif_unvers(ret, &argv, &argc, args->vn)))
		VMM_DEBUG(vmm, "args");
	return ret;
}

static const struct nvkm_vmm_func
nv04_vmm = {
	.valid = nv04_vmm_valid,
	.page = {
		{ 12, &nv04_vmm_desc_12[0], NVKM_VMM_PAGE_HOST },
		{}
	}
};

int
nv04_vmm_new_(const struct nvkm_vmm_func *func, struct nvkm_mmu *mmu,
	      u32 pd_header, bool managed, u64 addr, u64 size,
	      void *argv, u32 argc, struct lock_class_key *key,
	      const char *name, struct nvkm_vmm **pvmm)
{
	union {
		struct nv04_vmm_vn vn;
	} *args = argv;
	int ret;

Annotation

Implementation Notes