drm/nouveau/mmu/gp100,gp10b: implement new vmm backend

Adds support for:
- 64KiB/2MiB big page sizes (128KiB not supported by HW with new PT layout).
- System-memory PTs.
- LPTE "invalid" state.
- (Tegra) Use of video memory aperture.
- Sparse PDEs/PTEs.
- Additional blocklinear kinds.
- 49-bit address-space.

GP100 supports an entirely new 5-level page table layout that provides
an expanded 49-bit address-space.  It also supports the layout present
on previous generations, which we've been making do with until now.

This commit implements support for the new layout, and enables it by
default.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/include/nvif/ifc00d.h

@@ -5,4 +5,17 @@
 struct gp100_vmm_vn {
 	/* nvif_vmm_vX ... */
 };
+
+struct gp100_vmm_map_vn {
+	/* nvif_vmm_map_vX ... */
+};
+
+struct gp100_vmm_map_v0 {
+	/* nvif_vmm_map_vX ... */
+	__u8  version;
+	__u8  vol;
+	__u8  ro;
+	__u8  priv;
+	__u8  kind;
+};
 #endif

drivers/gpu/drm/nouveau/nvkm/subdev/mmu/gf100.c

@@ -23,10 +23,6 @@
  */
 #include "vmm.h"
 
-#include <core/gpuobj.h>
-#include <subdev/fb.h>
-#include <subdev/timer.h>
-
 #include <nvif/class.h>
 
 /* Map from compressed to corresponding uncompressed storage type.
@@ -75,125 +71,6 @@ gf100_mmu_kind(struct nvkm_mmu *mmu, int *count)
 	return gf100_pte_storage_type_map;
 }
 
-void
-gf100_vm_map_pgt(struct nvkm_vmm *vmm, u32 index, struct nvkm_memory *pgt[2])
-{
-	struct nvkm_memory *pgd = vmm->pd->pt[0]->memory;
-	u32 pde[2] = { 0, 0 };
-
-	if (pgt[0])
-		pde[1] = 0x00000001 | (nvkm_memory_addr(pgt[0]) >> 8);
-	if (pgt[1])
-		pde[0] = 0x00000001 | (nvkm_memory_addr(pgt[1]) >> 8);
-
-	nvkm_kmap(pgd);
-	nvkm_wo32(pgd, (index * 8) + 0, pde[0]);
-	nvkm_wo32(pgd, (index * 8) + 4, pde[1]);
-	nvkm_done(pgd);
-}
-
-static inline u64
-gf100_vm_addr(struct nvkm_vma *vma, u64 phys, u32 memtype, u32 target)
-{
-	phys >>= 8;
-
-	phys |= 0x00000001; /* present */
-	if (vma->access & NV_MEM_ACCESS_SYS)
-		phys |= 0x00000002;
-
-	phys |= ((u64)target  << 32);
-	phys |= ((u64)memtype << 36);
-	return phys;
-}
-
-void
-gf100_vm_map(struct nvkm_vma *vma, struct nvkm_memory *pgt,
-	     struct nvkm_mem *mem, u32 pte, u32 cnt, u64 phys, u64 delta)
-{
-	u64 next = 1 << (vma->node->type - 8);
-
-	phys  = gf100_vm_addr(vma, phys, mem->memtype, 0);
-	pte <<= 3;
-
-	if (mem->tag) {
-		u32 tag = mem->tag->offset + (delta >> 17);
-		phys |= (u64)tag << (32 + 12);
-		next |= (u64)1   << (32 + 12);
-	}
-
-	nvkm_kmap(pgt);
-	while (cnt--) {
-		nvkm_wo32(pgt, pte + 0, lower_32_bits(phys));
-		nvkm_wo32(pgt, pte + 4, upper_32_bits(phys));
-		phys += next;
-		pte  += 8;
-	}
-	nvkm_done(pgt);
-}
-
-void
-gf100_vm_map_sg(struct nvkm_vma *vma, struct nvkm_memory *pgt,
-		struct nvkm_mem *mem, u32 pte, u32 cnt, dma_addr_t *list)
-{
-	u32 target = (vma->access & NV_MEM_ACCESS_NOSNOOP) ? 7 : 5;
-	/* compressed storage types are invalid for system memory */
-	u32 memtype = gf100_pte_storage_type_map[mem->memtype & 0xff];
-
-	nvkm_kmap(pgt);
-	pte <<= 3;
-	while (cnt--) {
-		u64 phys = gf100_vm_addr(vma, *list++, memtype, target);
-		nvkm_wo32(pgt, pte + 0, lower_32_bits(phys));
-		nvkm_wo32(pgt, pte + 4, upper_32_bits(phys));
-		pte += 8;
-	}
-	nvkm_done(pgt);
-}
-
-void
-gf100_vm_unmap(struct nvkm_vma *vma, struct nvkm_memory *pgt, u32 pte, u32 cnt)
-{
-	nvkm_kmap(pgt);
-	pte <<= 3;
-	while (cnt--) {
-		nvkm_wo32(pgt, pte + 0, 0x00000000);
-		nvkm_wo32(pgt, pte + 4, 0x00000000);
-		pte += 8;
-	}
-	nvkm_done(pgt);
-}
-
-void
-gf100_vm_flush(struct nvkm_vm *vm)
-{
-	struct nvkm_mmu *mmu = vm->mmu;
-	struct nvkm_device *device = mmu->subdev.device;
-	u32 type;
-
-	type = 0x00000001; /* PAGE_ALL */
-	if (atomic_read(&vm->engref[NVKM_SUBDEV_BAR]))
-		type |= 0x00000004; /* HUB_ONLY */
-
-	mutex_lock(&mmu->subdev.mutex);
-	/* looks like maybe a "free flush slots" counter, the
-	 * faster you write to 0x100cbc to more it decreases
-	 */
-	nvkm_msec(device, 2000,
-		if (nvkm_rd32(device, 0x100c80) & 0x00ff0000)
-			break;
-	);
-
-	nvkm_wr32(device, 0x100cb8, vm->pd->pt[0]->addr >> 8);
-	nvkm_wr32(device, 0x100cbc, 0x80000000 | type);
-
-	/* wait for flush to be queued? */
-	nvkm_msec(device, 2000,
-		if (nvkm_rd32(device, 0x100c80) & 0x00008000)
-			break;
-	);
-	mutex_unlock(&mmu->subdev.mutex);
-}
-
 static const struct nvkm_mmu_func
 gf100_mmu = {
 	.limit = (1ULL << 40),

drivers/gpu/drm/nouveau/nvkm/subdev/mmu/gp100.c

@@ -31,12 +31,13 @@ gp100_mmu = {
 	.dma_bits = 47,
 	.lpg_shift = 16,
 	.vmm = {{ -1, -1, NVIF_CLASS_VMM_GP100}, gp100_vmm_new },
+	.kind = gm200_mmu_kind,
 };
 
 int
 gp100_mmu_new(struct nvkm_device *device, int index, struct nvkm_mmu **pmmu)
 {
-	if (!nvkm_boolopt(device->cfgopt, "GP100MmuLayout", false))
+	if (!nvkm_boolopt(device->cfgopt, "GP100MmuLayout", true))
 		return gm200_mmu_new(device, index, pmmu);
 	return nvkm_mmu_new_(&gp100_mmu, device, index, pmmu);
 }

drivers/gpu/drm/nouveau/nvkm/subdev/mmu/gp10b.c

@@ -31,12 +31,13 @@ gp10b_mmu = {
 	.dma_bits = 47,
 	.lpg_shift = 16,
 	.vmm = {{ -1, -1, NVIF_CLASS_VMM_GP100}, gp10b_vmm_new },
+	.kind = gm200_mmu_kind,
 };
 
 int
 gp10b_mmu_new(struct nvkm_device *device, int index, struct nvkm_mmu **pmmu)
 {
-	if (!nvkm_boolopt(device->cfgopt, "GP100MmuLayout", false))
+	if (!nvkm_boolopt(device->cfgopt, "GP100MmuLayout", true))
 		return gm20b_mmu_new(device, index, pmmu);
 	return nvkm_mmu_new_(&gp10b_mmu, device, index, pmmu);
 }

drivers/gpu/drm/nouveau/nvkm/subdev/mmu/priv.h

@@ -45,13 +45,6 @@ extern const struct nvkm_mmu_func nv04_mmu;
 
 const u8 *nv50_mmu_kind(struct nvkm_mmu *, int *count);
 
-void gf100_vm_map_pgt(struct nvkm_vmm *, u32, struct nvkm_memory **);
-void gf100_vm_map(struct nvkm_vma *, struct nvkm_memory *, struct nvkm_mem *,
-		  u32, u32, u64, u64);
-void gf100_vm_map_sg(struct nvkm_vma *, struct nvkm_memory *, struct nvkm_mem *,
-		     u32, u32, dma_addr_t *);
-void gf100_vm_unmap(struct nvkm_vma *, struct nvkm_memory *, u32, u32);
-void gf100_vm_flush(struct nvkm_vm *);
 const u8 *gf100_mmu_kind(struct nvkm_mmu *, int *count);
 
 const u8 *gm200_mmu_kind(struct nvkm_mmu *, int *);

drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmm.h

@@ -189,6 +189,8 @@ int gm200_vmm_join_(struct nvkm_vmm *, struct nvkm_memory *, u64 base);
 int gm200_vmm_join(struct nvkm_vmm *, struct nvkm_memory *);
 
 int gp100_vmm_join(struct nvkm_vmm *, struct nvkm_memory *);
+int gp100_vmm_valid(struct nvkm_vmm *, void *, u32, struct nvkm_vmm_map *);
+void gp100_vmm_flush(struct nvkm_vmm *, int);
 
 int nv04_vmm_new(struct nvkm_mmu *, u64, u64, void *, u32,
 		 struct lock_class_key *, const char *, struct nvkm_vmm **);

drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmgf100.c

@@ -182,7 +182,7 @@ gf100_vmm_flush_(struct nvkm_vmm *vmm, int depth)
 {
 	struct nvkm_subdev *subdev = &vmm->mmu->subdev;
 	struct nvkm_device *device = subdev->device;
-	u32 type;
+	u32 type = depth << 24;
 
 	type = 0x00000001; /* PAGE_ALL */
 	if (atomic_read(&vmm->engref[NVKM_SUBDEV_BAR]))

drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmgp100.c

@@ -21,20 +21,190 @@
  */
 #include "vmm.h"
 
+#include <subdev/fb.h>
+#include <subdev/ltc.h>
+
+#include <nvif/ifc00d.h>
+#include <nvif/unpack.h>
+
+static inline void
+gp100_vmm_pgt_pte(struct nvkm_vmm *vmm, struct nvkm_mmu_pt *pt,
+		  u32 ptei, u32 ptes, struct nvkm_vmm_map *map, u64 addr)
+{
+	u64 data = (addr >> 4) | map->type;
+
+	map->type += ptes * map->ctag;
+
+	while (ptes--) {
+		VMM_WO064(pt, vmm, ptei++ * 8, data);
+		data += map->next;
+	}
+}
+
+static void
+gp100_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, gp100_vmm_pgt_pte);
+}
+
+static void
+gp100_vmm_pgt_dma(struct nvkm_vmm *vmm, struct nvkm_mmu_pt *pt,
+		  u32 ptei, u32 ptes, struct nvkm_vmm_map *map)
+{
+	if (map->page->shift == PAGE_SHIFT) {
+		VMM_SPAM(vmm, "DMAA %08x %08x PTE(s)", ptei, ptes);
+		nvkm_kmap(pt->memory);
+		while (ptes--) {
+			const u64 data = (*map->dma++ >> 4) | 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, gp100_vmm_pgt_pte);
+}
+
+static void
+gp100_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, gp100_vmm_pgt_pte);
+}
+
+static void
+gp100_vmm_pgt_sparse(struct nvkm_vmm *vmm,
+		     struct nvkm_mmu_pt *pt, u32 ptei, u32 ptes)
+{
+	/* VALID_FALSE + VOL tells the MMU to treat the PTE as sparse. */
+	VMM_FO064(pt, vmm, ptei * 8, BIT_ULL(3) /* VOL. */, ptes);
+}
+
 static const struct nvkm_vmm_desc_func
 gp100_vmm_desc_spt = {
+	.unmap = gf100_vmm_pgt_unmap,
+	.sparse = gp100_vmm_pgt_sparse,
+	.mem = gp100_vmm_pgt_mem,
+	.dma = gp100_vmm_pgt_dma,
+	.sgl = gp100_vmm_pgt_sgl,
 };
 
+static void
+gp100_vmm_lpt_invalid(struct nvkm_vmm *vmm,
+		      struct nvkm_mmu_pt *pt, u32 ptei, u32 ptes)
+{
+	/* VALID_FALSE + PRIV tells the MMU to ignore corresponding SPTEs. */
+	VMM_FO064(pt, vmm, ptei * 8, BIT_ULL(5) /* PRIV. */, ptes);
+}
+
 static const struct nvkm_vmm_desc_func
 gp100_vmm_desc_lpt = {
+	.invalid = gp100_vmm_lpt_invalid,
+	.unmap = gf100_vmm_pgt_unmap,
+	.sparse = gp100_vmm_pgt_sparse,
+	.mem = gp100_vmm_pgt_mem,
 };
 
+static inline void
+gp100_vmm_pd0_pte(struct nvkm_vmm *vmm, struct nvkm_mmu_pt *pt,
+		  u32 ptei, u32 ptes, struct nvkm_vmm_map *map, u64 addr)
+{
+	u64 data = (addr >> 4) | map->type;
+
+	map->type += ptes * map->ctag;
+
+	while (ptes--) {
+		VMM_WO128(pt, vmm, ptei++ * 0x10, data, 0ULL);
+		data += map->next;
+	}
+}
+
+static void
+gp100_vmm_pd0_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, gp100_vmm_pd0_pte);
+}
+
+static inline bool
+gp100_vmm_pde(struct nvkm_mmu_pt *pt, u64 *data)
+{
+	switch (nvkm_memory_target(pt->memory)) {
+	case NVKM_MEM_TARGET_VRAM: *data |= 1ULL << 1; break;
+	case NVKM_MEM_TARGET_HOST: *data |= 2ULL << 1;
+		*data |= BIT_ULL(3); /* VOL. */
+		break;
+	case NVKM_MEM_TARGET_NCOH: *data |= 3ULL << 1; break;
+	default:
+		WARN_ON(1);
+		return false;
+	}
+	*data |= pt->addr >> 4;
+	return true;
+}
+
+static void
+gp100_vmm_pd0_pde(struct nvkm_vmm *vmm, struct nvkm_vmm_pt *pgd, u32 pdei)
+{
+	struct nvkm_vmm_pt *pgt = pgd->pde[pdei];
+	struct nvkm_mmu_pt *pd = pgd->pt[0];
+	u64 data[2] = {};
+
+	if (pgt->pt[0] && !gp100_vmm_pde(pgt->pt[0], &data[0]))
+		return;
+	if (pgt->pt[1] && !gp100_vmm_pde(pgt->pt[1], &data[1]))
+		return;
+
+	nvkm_kmap(pd->memory);
+	VMM_WO128(pd, vmm, pdei * 0x10, data[0], data[1]);
+	nvkm_done(pd->memory);
+}
+
+static void
+gp100_vmm_pd0_sparse(struct nvkm_vmm *vmm,
+		     struct nvkm_mmu_pt *pt, u32 pdei, u32 pdes)
+{
+	/* VALID_FALSE + VOL_BIG tells the MMU to treat the PDE as sparse. */
+	VMM_FO128(pt, vmm, pdei * 0x10, BIT_ULL(3) /* VOL_BIG. */, 0ULL, pdes);
+}
+
+static void
+gp100_vmm_pd0_unmap(struct nvkm_vmm *vmm,
+		    struct nvkm_mmu_pt *pt, u32 pdei, u32 pdes)
+{
+	VMM_FO128(pt, vmm, pdei * 0x10, 0ULL, 0ULL, pdes);
+}
+
 static const struct nvkm_vmm_desc_func
 gp100_vmm_desc_pd0 = {
+	.unmap = gp100_vmm_pd0_unmap,
+	.sparse = gp100_vmm_pd0_sparse,
+	.pde = gp100_vmm_pd0_pde,
+	.mem = gp100_vmm_pd0_mem,
 };
 
+static void
+gp100_vmm_pd1_pde(struct nvkm_vmm *vmm, struct nvkm_vmm_pt *pgd, u32 pdei)
+{
+	struct nvkm_vmm_pt *pgt = pgd->pde[pdei];
+	struct nvkm_mmu_pt *pd = pgd->pt[0];
+	u64 data = 0;
+
+	if (!gp100_vmm_pde(pgt->pt[0], &data))
+		return;
+
+	nvkm_kmap(pd->memory);
+	VMM_WO064(pd, vmm, pdei * 8, data);
+	nvkm_done(pd->memory);
+}
+
 static const struct nvkm_vmm_desc_func
 gp100_vmm_desc_pd1 = {
+	.unmap = gf100_vmm_pgt_unmap,
+	.sparse = gp100_vmm_pgt_sparse,
+	.pde = gp100_vmm_pd1_pde,
 };
 
 const struct nvkm_vmm_desc
@@ -57,6 +227,91 @@ gp100_vmm_desc_12[] = {
 	{}
 };
 
+int
+gp100_vmm_valid(struct nvkm_vmm *vmm, void *argv, u32 argc,
+		struct nvkm_vmm_map *map)
+{
+	const enum nvkm_memory_target target = nvkm_memory_target(map->memory);
+	const struct nvkm_vmm_page *page = map->page;
+	union {
+		struct gp100_vmm_map_vn vn;
+		struct gp100_vmm_map_v0 v0;
+	} *args = argv;
+	struct nvkm_device *device = vmm->mmu->subdev.device;
+	struct nvkm_memory *memory = map->memory;
+	u8  kind, priv, ro, vol;
+	int kindn, aper, ret = -ENOSYS;
+	const u8 *kindm;
+
+	map->next = (1ULL << page->shift) >> 4;
+	map->type = 0;
+
+	if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, false))) {
+		vol  = !!args->v0.vol;
+		ro   = !!args->v0.ro;
+		priv = !!args->v0.priv;
+		kind =   args->v0.kind;
+	} else
+	if (!(ret = nvif_unvers(ret, &argv, &argc, args->vn))) {
+		vol  = target == NVKM_MEM_TARGET_HOST;
+		ro   = 0;
+		priv = 0;
+		kind = 0x00;
+	} else {
+		VMM_DEBUG(vmm, "args");
+		return ret;
+	}
+
+	aper = vmm->func->aper(target);
+	if (WARN_ON(aper < 0))
+		return aper;
+
+	kindm = vmm->mmu->func->kind(vmm->mmu, &kindn);
+	if (kind >= kindn || kindm[kind] == 0xff) {
+		VMM_DEBUG(vmm, "kind %02x", kind);
+		return -EINVAL;
+	}
+
+	if (kindm[kind] != kind) {
+		u64 tags = nvkm_memory_size(memory) >> 16;
+		if (aper != 0 || !(page->type & NVKM_VMM_PAGE_COMP)) {
+			VMM_DEBUG(vmm, "comp %d %02x", aper, page->type);
+			return -EINVAL;
+		}
+
+		ret = nvkm_memory_tags_get(memory, device, tags,
+					   nvkm_ltc_tags_clear,
+					   &map->tags);
+		if (ret) {
+			VMM_DEBUG(vmm, "comp %d", ret);
+			return ret;
+		}
+
+		if (map->tags->mn) {
+			tags = map->tags->mn->offset + (map->offset >> 16);
+			map->ctag |= ((1ULL << page->shift) >> 16) << 36;
+			map->type |= tags << 36;
+			map->next |= map->ctag;
+		} else {
+			kind = kindm[kind];
+		}
+	}
+
+	map->type |= BIT(0);
+	map->type |= (u64)aper << 1;
+	map->type |= (u64) vol << 3;
+	map->type |= (u64)priv << 5;
+	map->type |= (u64)  ro << 6;
+	map->type |= (u64)kind << 56;
+	return 0;
+}
+
+void
+gp100_vmm_flush(struct nvkm_vmm *vmm, int depth)
+{
+	gf100_vmm_flush_(vmm, 5 /* CACHE_LEVEL_UP_TO_PDE3 */ - depth);
+}
+
 int
 gp100_vmm_join(struct nvkm_vmm *vmm, struct nvkm_memory *inst)
 {
@@ -68,6 +323,9 @@ static const struct nvkm_vmm_func
 gp100_vmm = {
 	.join = gp100_vmm_join,
 	.part = gf100_vmm_part,
+	.aper = gf100_vmm_aper,
+	.valid = gp100_vmm_valid,
+	.flush = gp100_vmm_flush,
 	.page = {
 		{ 47, &gp100_vmm_desc_16[4], NVKM_VMM_PAGE_Sxxx },
 		{ 38, &gp100_vmm_desc_16[3], NVKM_VMM_PAGE_Sxxx },

drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmgp10b.c

@@ -25,6 +25,9 @@ static const struct nvkm_vmm_func
 gp10b_vmm = {
 	.join = gp100_vmm_join,
 	.part = gf100_vmm_part,
+	.aper = gk20a_vmm_aper,
+	.valid = gp100_vmm_valid,
+	.flush = gp100_vmm_flush,
 	.page = {
 		{ 47, &gp100_vmm_desc_16[4], NVKM_VMM_PAGE_Sxxx },
 		{ 38, &gp100_vmm_desc_16[3], NVKM_VMM_PAGE_Sxxx },