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>

1 files changed, 258 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmgp100.c b/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmgp100.c
index 68f67812aecc..059fafe0e771 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmgp100.c
+++ b/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
@@ -58,6 +228,91 @@ 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)
 {
 	const u64 base = BIT_ULL(10) /* VER2 */ | BIT_ULL(11); /* 64KiB */
@@ -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 },