drm/nouveau/mmu: add base for type-based memory allocation

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

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

@@ -14,6 +14,8 @@
 #define NVIF_CLASS_SW_NV50                           /* if0005.h */ -0x00000006
 #define NVIF_CLASS_SW_GF100                          /* if0005.h */ -0x00000007
 
+#define NVIF_CLASS_MEM                               /* if000a.h */  0x8000000a
+
 #define NVIF_CLASS_VMM                               /* if000c.h */  0x8000000c
 #define NVIF_CLASS_VMM_NV04                          /* if000d.h */  0x8000000d
 #define NVIF_CLASS_VMM_NV50                          /* if500d.h */  0x8000500d

drivers/gpu/drm/nouveau/include/nvif/if000a.h

@@ -0,0 +1,13 @@
+#ifndef __NVIF_IF000A_H__
+#define __NVIF_IF000A_H__
+
+struct nvif_mem_ram_vn {
+};
+
+struct nvif_mem_ram_v0 {
+	__u8  version;
+	__u8  pad01[7];
+	dma_addr_t *dma;
+	struct scatterlist *sgl;
+};
+#endif

drivers/gpu/drm/nouveau/nvkm/subdev/mmu/Kbuild

@@ -12,6 +12,8 @@ nvkm-y += nvkm/subdev/mmu/gm20b.o
 nvkm-y += nvkm/subdev/mmu/gp100.o
 nvkm-y += nvkm/subdev/mmu/gp10b.o
 
+nvkm-y += nvkm/subdev/mmu/mem.o
+
 nvkm-y += nvkm/subdev/mmu/vmm.o
 nvkm-y += nvkm/subdev/mmu/vmmnv04.o
 nvkm-y += nvkm/subdev/mmu/vmmnv41.o

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

@@ -0,0 +1,242 @@
+/*
+ * Copyright 2017 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+#define nvkm_mem(p) container_of((p), struct nvkm_mem, memory)
+#include "mem.h"
+
+#include <core/memory.h>
+
+#include <nvif/if000a.h>
+#include <nvif/unpack.h>
+
+struct nvkm_mem {
+	struct nvkm_memory memory;
+	enum nvkm_memory_target target;
+	struct nvkm_mmu *mmu;
+	u64 pages;
+	struct page **mem;
+	union {
+		struct scatterlist *sgl;
+		dma_addr_t *dma;
+	};
+};
+
+static enum nvkm_memory_target
+nvkm_mem_target(struct nvkm_memory *memory)
+{
+	return nvkm_mem(memory)->target;
+}
+
+static u8
+nvkm_mem_page(struct nvkm_memory *memory)
+{
+	return PAGE_SHIFT;
+}
+
+static u64
+nvkm_mem_addr(struct nvkm_memory *memory)
+{
+	struct nvkm_mem *mem = nvkm_mem(memory);
+	if (mem->pages == 1 && mem->mem)
+		return mem->dma[0];
+	return ~0ULL;
+}
+
+static u64
+nvkm_mem_size(struct nvkm_memory *memory)
+{
+	return nvkm_mem(memory)->pages << PAGE_SHIFT;
+}
+
+static int
+nvkm_mem_map_dma(struct nvkm_memory *memory, u64 offset, struct nvkm_vmm *vmm,
+		 struct nvkm_vma *vma, void *argv, u32 argc)
+{
+	struct nvkm_mem *mem = nvkm_mem(memory);
+	struct nvkm_vmm_map map = {
+		.memory = &mem->memory,
+		.offset = offset,
+		.dma = mem->dma,
+	};
+	return nvkm_vmm_map(vmm, vma, argv, argc, &map);
+}
+
+static void *
+nvkm_mem_dtor(struct nvkm_memory *memory)
+{
+	struct nvkm_mem *mem = nvkm_mem(memory);
+	if (mem->mem) {
+		while (mem->pages--) {
+			dma_unmap_page(mem->mmu->subdev.device->dev,
+				       mem->dma[mem->pages], PAGE_SIZE,
+				       DMA_BIDIRECTIONAL);
+			__free_page(mem->mem[mem->pages]);
+		}
+		kvfree(mem->dma);
+		kvfree(mem->mem);
+	}
+	return mem;
+}
+
+static const struct nvkm_memory_func
+nvkm_mem_dma = {
+	.dtor = nvkm_mem_dtor,
+	.target = nvkm_mem_target,
+	.page = nvkm_mem_page,
+	.addr = nvkm_mem_addr,
+	.size = nvkm_mem_size,
+	.map = nvkm_mem_map_dma,
+};
+
+static int
+nvkm_mem_map_sgl(struct nvkm_memory *memory, u64 offset, struct nvkm_vmm *vmm,
+		 struct nvkm_vma *vma, void *argv, u32 argc)
+{
+	struct nvkm_mem *mem = nvkm_mem(memory);
+	struct nvkm_vmm_map map = {
+		.memory = &mem->memory,
+		.offset = offset,
+		.sgl = mem->sgl,
+	};
+	return nvkm_vmm_map(vmm, vma, argv, argc, &map);
+}
+
+static const struct nvkm_memory_func
+nvkm_mem_sgl = {
+	.dtor = nvkm_mem_dtor,
+	.target = nvkm_mem_target,
+	.page = nvkm_mem_page,
+	.addr = nvkm_mem_addr,
+	.size = nvkm_mem_size,
+	.map = nvkm_mem_map_sgl,
+};
+
+int
+nvkm_mem_map_host(struct nvkm_memory *memory, void **pmap)
+{
+	struct nvkm_mem *mem = nvkm_mem(memory);
+	if (mem->mem) {
+		*pmap = vmap(mem->mem, mem->pages, VM_MAP, PAGE_KERNEL);
+		return *pmap ? 0 : -EFAULT;
+	}
+	return -EINVAL;
+}
+
+static int
+nvkm_mem_new_host(struct nvkm_mmu *mmu, int type, u8 page, u64 size,
+		  void *argv, u32 argc, struct nvkm_memory **pmemory)
+{
+	struct device *dev = mmu->subdev.device->dev;
+	union {
+		struct nvif_mem_ram_vn vn;
+		struct nvif_mem_ram_v0 v0;
+	} *args = argv;
+	int ret = -ENOSYS;
+	enum nvkm_memory_target target;
+	struct nvkm_mem *mem;
+	gfp_t gfp = GFP_USER | __GFP_ZERO;
+
+	if ( (mmu->type[type].type & NVKM_MEM_COHERENT) &&
+	    !(mmu->type[type].type & NVKM_MEM_UNCACHED))
+		target = NVKM_MEM_TARGET_HOST;
+	else
+		target = NVKM_MEM_TARGET_NCOH;
+
+	if (page != PAGE_SHIFT)
+		return -EINVAL;
+
+	if (!(mem = kzalloc(sizeof(*mem), GFP_KERNEL)))
+		return -ENOMEM;
+	mem->target = target;
+	mem->mmu = mmu;
+	*pmemory = &mem->memory;
+
+	if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, false))) {
+		if (args->v0.dma) {
+			nvkm_memory_ctor(&nvkm_mem_dma, &mem->memory);
+			mem->dma = args->v0.dma;
+		} else {
+			nvkm_memory_ctor(&nvkm_mem_sgl, &mem->memory);
+			mem->sgl = args->v0.sgl;
+		}
+
+		if (!IS_ALIGNED(size, PAGE_SIZE))
+			return -EINVAL;
+		mem->pages = size >> PAGE_SHIFT;
+		return 0;
+	} else
+	if ( (ret = nvif_unvers(ret, &argv, &argc, args->vn))) {
+		kfree(mem);
+		return ret;
+	}
+
+	nvkm_memory_ctor(&nvkm_mem_dma, &mem->memory);
+	size = ALIGN(size, PAGE_SIZE) >> PAGE_SHIFT;
+
+	if (!(mem->mem = kvmalloc(sizeof(*mem->mem) * size, GFP_KERNEL)))
+		return -ENOMEM;
+	if (!(mem->dma = kvmalloc(sizeof(*mem->dma) * size, GFP_KERNEL)))
+		return -ENOMEM;
+
+	if (mmu->dma_bits > 32)
+		gfp |= GFP_HIGHUSER;
+	else
+		gfp |= GFP_DMA32;
+
+	for (mem->pages = 0; size; size--, mem->pages++) {
+		struct page *p = alloc_page(gfp);
+		if (!p)
+			return -ENOMEM;
+
+		mem->dma[mem->pages] = dma_map_page(mmu->subdev.device->dev,
+						    p, 0, PAGE_SIZE,
+						    DMA_BIDIRECTIONAL);
+		if (dma_mapping_error(dev, mem->dma[mem->pages])) {
+			__free_page(p);
+			return -ENOMEM;
+		}
+
+		mem->mem[mem->pages] = p;
+	}
+
+	return 0;
+}
+
+int
+nvkm_mem_new_type(struct nvkm_mmu *mmu, int type, u8 page, u64 size,
+		  void *argv, u32 argc, struct nvkm_memory **pmemory)
+{
+	struct nvkm_memory *memory = NULL;
+	int ret;
+
+	if (mmu->type[type].type & NVKM_MEM_VRAM) {
+		ret = mmu->func->mem.vram(mmu, type, page, size,
+					  argv, argc, &memory);
+	} else {
+		ret = nvkm_mem_new_host(mmu, type, page, size,
+					argv, argc, &memory);
+	}
+
+	if (ret)
+		nvkm_memory_unref(&memory);
+	*pmemory = memory;
+	return ret;
+}

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

@@ -0,0 +1,8 @@
+#ifndef __NVKM_MEM_H__
+#define __NVKM_MEM_H__
+#include "priv.h"
+
+int nvkm_mem_new_type(struct nvkm_mmu *, int type, u8 page, u64 size,
+		      void *argv, u32 argc, struct nvkm_memory **);
+int nvkm_mem_map_host(struct nvkm_memory *, void **pmap);
+#endif

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

@@ -15,6 +15,14 @@ struct nvkm_mmu_func {
 	u8  dma_bits;
 	u8  lpg_shift;
 
+	struct {
+		struct nvkm_sclass user;
+		int (*vram)(struct nvkm_mmu *, int type, u8 page, u64 size,
+			    void *argv, u32 argc, struct nvkm_memory **);
+		int (*umap)(struct nvkm_mmu *, struct nvkm_memory *, void *argv,
+			    u32 argc, u64 *addr, u64 *size, struct nvkm_vma **);
+	} mem;
+
 	struct {
 		struct nvkm_sclass user;
 		int (*ctor)(struct nvkm_mmu *, u64 addr, u64 size,