/*
 * Copyright 2012 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.
 *
 * Authors: Ben Skeggs
 */
#include <core/gpuobj.h>
#include <core/engine.h>

#include <subdev/instmem.h>
#include <subdev/bar.h>
#include <subdev/mmu.h>

/* fast-path, where backend is able to provide direct pointer to memory */
static u32
nvkm_gpuobj_rd32_fast(struct nvkm_gpuobj *gpuobj, u32 offset)
{
        return ioread32_native(gpuobj->map + offset);
}

static void
nvkm_gpuobj_wr32_fast(struct nvkm_gpuobj *gpuobj, u32 offset, u32 data)
{
        iowrite32_native(data, gpuobj->map + offset);
}

/* accessor functions for gpuobjs allocated directly from instmem */
static u32
nvkm_gpuobj_heap_rd32(struct nvkm_gpuobj *gpuobj, u32 offset)
{
        return nvkm_ro32(gpuobj->memory, offset);
}

static void
nvkm_gpuobj_heap_wr32(struct nvkm_gpuobj *gpuobj, u32 offset, u32 data)
{
        nvkm_wo32(gpuobj->memory, offset, data);
}

static const struct nvkm_gpuobj_func nvkm_gpuobj_heap;
static void
nvkm_gpuobj_heap_release(struct nvkm_gpuobj *gpuobj)
{
        gpuobj->func = &nvkm_gpuobj_heap;
        nvkm_done(gpuobj->memory);
}

static const struct nvkm_gpuobj_func
nvkm_gpuobj_heap_fast = {
        .release = nvkm_gpuobj_heap_release,
        .rd32 = nvkm_gpuobj_rd32_fast,
        .wr32 = nvkm_gpuobj_wr32_fast,
};

static const struct nvkm_gpuobj_func
nvkm_gpuobj_heap_slow = {
        .release = nvkm_gpuobj_heap_release,
        .rd32 = nvkm_gpuobj_heap_rd32,
        .wr32 = nvkm_gpuobj_heap_wr32,
};

static void *
nvkm_gpuobj_heap_acquire(struct nvkm_gpuobj *gpuobj)
{
        gpuobj->map = nvkm_kmap(gpuobj->memory);
        if (likely(gpuobj->map))
                gpuobj->func = &nvkm_gpuobj_heap_fast;
        else
                gpuobj->func = &nvkm_gpuobj_heap_slow;
        return gpuobj->map;
}

static const struct nvkm_gpuobj_func
nvkm_gpuobj_heap = {
        .acquire = nvkm_gpuobj_heap_acquire,
};

/* accessor functions for gpuobjs sub-allocated from a parent gpuobj */
static u32
nvkm_gpuobj_rd32(struct nvkm_gpuobj *gpuobj, u32 offset)
{
        return nvkm_ro32(gpuobj->parent, gpuobj->node->offset + offset);
}

static void
nvkm_gpuobj_wr32(struct nvkm_gpuobj *gpuobj, u32 offset, u32 data)
{
        nvkm_wo32(gpuobj->parent, gpuobj->node->offset + offset, data);
}

static const struct nvkm_gpuobj_func nvkm_gpuobj_func;
static void
nvkm_gpuobj_release(struct nvkm_gpuobj *gpuobj)
{
        gpuobj->func = &nvkm_gpuobj_func;
        nvkm_done(gpuobj->parent);
}

static const struct nvkm_gpuobj_func
nvkm_gpuobj_fast = {
        .release = nvkm_gpuobj_release,
        .rd32 = nvkm_gpuobj_rd32_fast,
        .wr32 = nvkm_gpuobj_wr32_fast,
};

static const struct nvkm_gpuobj_func
nvkm_gpuobj_slow = {
        .release = nvkm_gpuobj_release,
        .rd32 = nvkm_gpuobj_rd32,
        .wr32 = nvkm_gpuobj_wr32,
};

static void *
nvkm_gpuobj_acquire(struct nvkm_gpuobj *gpuobj)
{
        gpuobj->map = nvkm_kmap(gpuobj->parent);
        if (likely(gpuobj->map)) {
                gpuobj->map  = (u8 *)gpuobj->map + gpuobj->node->offset;
                gpuobj->func = &nvkm_gpuobj_fast;
        } else {
                gpuobj->func = &nvkm_gpuobj_slow;
        }
        return gpuobj->map;
}

static const struct nvkm_gpuobj_func
nvkm_gpuobj_func = {
        .acquire = nvkm_gpuobj_acquire,
};

static int
nvkm_gpuobj_ctor(struct nvkm_device *device, u32 size, int align, bool zero,
                 struct nvkm_gpuobj *parent, struct nvkm_gpuobj *gpuobj)
{
        u32 offset;
        int ret;

        if (parent) {
                if (align >= 0) {
                        ret = nvkm_mm_head(&parent->heap, 0, 1, size, size,
                                           max(align, 1), &gpuobj->node);
                } else {
                        ret = nvkm_mm_tail(&parent->heap, 0, 1, size, size,
                                           -align, &gpuobj->node);
                }
                if (ret)
                        return ret;

                gpuobj->parent = parent;
                gpuobj->func = &nvkm_gpuobj_func;
                gpuobj->addr = parent->addr + gpuobj->node->offset;
                gpuobj->size = gpuobj->node->length;

                if (zero) {
                        nvkm_kmap(gpuobj);
                        for (offset = 0; offset < gpuobj->size; offset += 4)
                                nvkm_wo32(gpuobj, offset, 0x00000000);
                        nvkm_done(gpuobj);
                }
        } else {
                ret = nvkm_memory_new(device, NVKM_MEM_TARGET_INST, size,
                                      abs(align), zero, &gpuobj->memory);
                if (ret)
                        return ret;

                gpuobj->func = &nvkm_gpuobj_heap;
                gpuobj->addr = nvkm_memory_addr(gpuobj->memory);
                gpuobj->size = nvkm_memory_size(gpuobj->memory);
        }

        return nvkm_mm_init(&gpuobj->heap, 0, gpuobj->size, 1);
}

void
nvkm_gpuobj_del(struct nvkm_gpuobj **pgpuobj)
{
        struct nvkm_gpuobj *gpuobj = *pgpuobj;
        if (gpuobj) {
                if (gpuobj->parent)
                        nvkm_mm_free(&gpuobj->parent->heap, &gpuobj->node);
                nvkm_mm_fini(&gpuobj->heap);
                nvkm_memory_del(&gpuobj->memory);
                kfree(*pgpuobj);
                *pgpuobj = NULL;
        }
}

int
nvkm_gpuobj_new(struct nvkm_device *device, u32 size, int align, bool zero,
                struct nvkm_gpuobj *parent, struct nvkm_gpuobj **pgpuobj)
{
        struct nvkm_gpuobj *gpuobj;
        int ret;

        if (!(gpuobj = *pgpuobj = kzalloc(sizeof(*gpuobj), GFP_KERNEL)))
                return -ENOMEM;

        ret = nvkm_gpuobj_ctor(device, size, align, zero, parent, gpuobj);
        if (ret)
                nvkm_gpuobj_del(pgpuobj);
        return ret;
}

int
nvkm_gpuobj_map(struct nvkm_gpuobj *gpuobj, struct nvkm_vm *vm,
                u32 access, struct nvkm_vma *vma)
{
        struct nvkm_memory *memory = gpuobj->memory;
        int ret = nvkm_vm_get(vm, gpuobj->size, 12, access, vma);
        if (ret == 0)
                nvkm_memory_map(memory, vma, 0);
        return ret;
}

void
nvkm_gpuobj_unmap(struct nvkm_vma *vma)
{
        if (vma->node) {
                nvkm_vm_unmap(vma);
                nvkm_vm_put(vma);
        }
}

/* the below is basically only here to support sharing the paged dma object
 * for PCI(E)GART on <=nv4x chipsets, and should *not* be expected to work
 * anywhere else.
 */

int
nvkm_gpuobj_wrap(struct nvkm_memory *memory, struct nvkm_gpuobj **pgpuobj)
{
        if (!(*pgpuobj = kzalloc(sizeof(**pgpuobj), GFP_KERNEL)))
                return -ENOMEM;

        (*pgpuobj)->addr = nvkm_memory_addr(memory);
        (*pgpuobj)->size = nvkm_memory_size(memory);
        return 0;
}

void
nvkm_gpuobj_memcpy_to(struct nvkm_gpuobj *dst, u32 dstoffset, void *src,
                      u32 length)
{
        int i;

        for (i = 0; i < length; i += 4)
                nvkm_wo32(dst, dstoffset + i, *(u32 *)(src + i));
}

void
nvkm_gpuobj_memcpy_from(void *dst, struct nvkm_gpuobj *src, u32 srcoffset,
                        u32 length)
{
        int i;

        for (i = 0; i < length; i += 4)
                ((u32 *)src)[i / 4] = nvkm_ro32(src, srcoffset + i);
}