/*
 * 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 "nouveau_vmm.h"
#include "nouveau_drv.h"
#include "nouveau_bo.h"
#include "nouveau_svm.h"
#include "nouveau_mem.h"

void
nouveau_vma_unmap(struct nouveau_vma *vma)
{
        if (vma->mem) {
                nvif_vmm_unmap(&vma->vmm->vmm, vma->addr);
                vma->mem = NULL;
        }
}

int
nouveau_vma_map(struct nouveau_vma *vma, struct nouveau_mem *mem)
{
        struct nvif_vma tmp = { .addr = vma->addr };
        int ret = nouveau_mem_map(mem, &vma->vmm->vmm, &tmp);
        if (ret)
                return ret;
        vma->mem = mem;
        return 0;
}

struct nouveau_vma *
nouveau_vma_find(struct nouveau_bo *nvbo, struct nouveau_vmm *vmm)
{
        struct nouveau_vma *vma;

        list_for_each_entry(vma, &nvbo->vma_list, head) {
                if (vma->vmm == vmm)
                        return vma;
        }

        return NULL;
}

void
nouveau_vma_del(struct nouveau_vma **pvma)
{
        struct nouveau_vma *vma = *pvma;
        if (vma && --vma->refs <= 0) {
                if (likely(vma->addr != ~0ULL)) {
                        struct nvif_vma tmp = { .addr = vma->addr, .size = 1 };
                        nvif_vmm_put(&vma->vmm->vmm, &tmp);
                }
                list_del(&vma->head);
                kfree(*pvma);
        }
        *pvma = NULL;
}

int
nouveau_vma_new(struct nouveau_bo *nvbo, struct nouveau_vmm *vmm,
                struct nouveau_vma **pvma)
{
        struct nouveau_mem *mem = nouveau_mem(nvbo->bo.resource);
        struct nouveau_vma *vma;
        struct nvif_vma tmp;
        int ret;

        if ((vma = *pvma = nouveau_vma_find(nvbo, vmm))) {
                vma->refs++;
                return 0;
        }

        if (!(vma = *pvma = kmalloc_obj(*vma)))
                return -ENOMEM;
        vma->vmm = vmm;
        vma->refs = 1;
        vma->addr = ~0ULL;
        vma->mem = NULL;
        vma->fence = NULL;
        list_add_tail(&vma->head, &nvbo->vma_list);

        if (nvbo->bo.resource->mem_type != TTM_PL_SYSTEM &&
            mem->mem.page == nvbo->page) {
                ret = nvif_vmm_get(&vmm->vmm, LAZY, false, mem->mem.page, 0,
                                   mem->mem.size, &tmp);
                if (ret)
                        goto done;

                vma->addr = tmp.addr;
                ret = nouveau_vma_map(vma, mem);
        } else {
                ret = nvif_vmm_get(&vmm->vmm, PTES, false, mem->mem.page, 0,
                                   mem->mem.size, &tmp);
                if (ret)
                        goto done;

                vma->addr = tmp.addr;
        }

done:
        if (ret)
                nouveau_vma_del(pvma);
        return ret;
}

void
nouveau_vmm_fini(struct nouveau_vmm *vmm)
{
        nouveau_svmm_fini(&vmm->svmm);
        nvif_vmm_dtor(&vmm->vmm);
        vmm->cli = NULL;
}

int
nouveau_vmm_init(struct nouveau_cli *cli, s32 oclass, struct nouveau_vmm *vmm)
{
        int ret = nvif_vmm_ctor(&cli->mmu, "drmVmm", oclass, UNMANAGED,
                                PAGE_SIZE, 0, NULL, 0, &vmm->vmm);
        if (ret)
                return ret;

        vmm->cli = cli;
        return 0;
}