drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmnv41.c
Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmnv41.c
File Facts
- System
- Linux kernel
- Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmnv41.c- Extension
.c- Size
- 3230 bytes
- Lines
- 113
- 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.
- 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.
- Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
vmm.hsubdev/timer.h
Detected Declarations
function filesfunction nv41_vmm_pgt_sglfunction nv41_vmm_pgt_dmafunction nv41_vmm_pgt_unmapfunction nv41_vmm_flushfunction nv41_vmm_new
Annotated Snippet
#include "vmm.h"
#include <subdev/timer.h>
static void
nv41_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 >> 7) | 0x00000001; /* VALID. */
while (ptes--) {
VMM_WO032(pt, vmm, ptei++ * 4, data);
data += 0x00000020;
}
}
static void
nv41_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, nv41_vmm_pgt_pte);
}
static void
nv41_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--) {
const u32 data = (*map->dma++ >> 7) | 0x00000001;
VMM_WO032(pt, vmm, ptei++ * 4, data);
}
nvkm_done(pt->memory);
#else
VMM_MAP_ITER_DMA(vmm, pt, ptei, ptes, map, nv41_vmm_pgt_pte);
#endif
}
static void
nv41_vmm_pgt_unmap(struct nvkm_vmm *vmm,
struct nvkm_mmu_pt *pt, u32 ptei, u32 ptes)
{
VMM_FO032(pt, vmm, ptei * 4, 0, ptes);
}
static const struct nvkm_vmm_desc_func
nv41_vmm_desc_pgt = {
.unmap = nv41_vmm_pgt_unmap,
.dma = nv41_vmm_pgt_dma,
.sgl = nv41_vmm_pgt_sgl,
};
static const struct nvkm_vmm_desc
nv41_vmm_desc_12[] = {
{ PGT, 17, 4, 0x1000, &nv41_vmm_desc_pgt },
{}
};
static void
nv41_vmm_flush(struct nvkm_vmm *vmm, int level)
{
struct nvkm_device *device = vmm->mmu->subdev.device;
mutex_lock(&vmm->mmu->mutex);
nvkm_wr32(device, 0x100810, 0x00000022);
nvkm_msec(device, 2000,
if (nvkm_rd32(device, 0x100810) & 0x00000020)
break;
);
nvkm_wr32(device, 0x100810, 0x00000000);
mutex_unlock(&vmm->mmu->mutex);
}
static const struct nvkm_vmm_func
nv41_vmm = {
.valid = nv04_vmm_valid,
.flush = nv41_vmm_flush,
.page = {
{ 12, &nv41_vmm_desc_12[0], NVKM_VMM_PAGE_HOST },
{}
}
};
int
nv41_vmm_new(struct nvkm_mmu *mmu, bool managed, u64 addr, u64 size,
void *argv, u32 argc, struct lock_class_key *key, const char *name,
struct nvkm_vmm **pvmm)
{
return nv04_vmm_new_(&nv41_vmm, mmu, 0, managed, addr, size,
argv, argc, key, name, pvmm);
Annotation
- Immediate include surface: `vmm.h`, `subdev/timer.h`.
- Detected declarations: `function files`, `function nv41_vmm_pgt_sgl`, `function nv41_vmm_pgt_dma`, `function nv41_vmm_pgt_unmap`, `function nv41_vmm_flush`, `function nv41_vmm_new`.
- Atlas domain: Driver Families / drivers/gpu.
- Implementation status: source implementation candidate.
- Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.