/*
 * 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.
 */
#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;

	ret = nvkm_vmm_new_(func, mmu, pd_header, managed, addr, size,
			    key, name, pvmm);
	if (ret)
		return ret;

	return nvif_unvers(-ENOSYS, &argv, &argc, args->vn);
}

int
nv04_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)
{
	struct nvkm_memory *mem;
	struct nvkm_vmm *vmm;
	int ret;

	ret = nv04_vmm_new_(&nv04_vmm, mmu, 8, managed, addr, size,
			    argv, argc, key, name, &vmm);
	*pvmm = vmm;
	if (ret)
		return ret;

	mem = vmm->pd->pt[0]->memory;
	nvkm_kmap(mem);
	nvkm_wo32(mem, 0x00000, 0x0002103d); /* PCI, RW, PT, !LN */
	nvkm_wo32(mem, 0x00004, vmm->limit - 1);
	nvkm_done(mem);
	return 0;
}