/*

 * Copyright © 2011 Red Hat

 *

 * 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 (including the next

 * paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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:

 *    Jerome Glisse <j.glisse@gmail.com>

 */

#define _FILE_OFFSET_BITS 64

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/mman.h>

#include <errno.h>

#include "xf86drm.h"

#include "radeon_drm.h"

#include "rbo.h"

struct rbo *rbo(int fd, unsigned handle, unsigned size,

                unsigned alignment, void *ptr)

{

    struct rbo *bo;

    int r;

    bo = calloc(1, sizeof(*bo));

    if (bo == NULL) {

        return NULL;

    }

    list_inithead(&bo->list);

    bo->fd = fd;

    bo->size = size;

    bo->handle = handle;

    bo->refcount = 1;

    bo->alignment = alignment;

    if (handle) {

        struct drm_gem_open open_arg;

        memset(&open_arg, 0, sizeof(open_arg));

        open_arg.name = handle;

        r = drmIoctl(fd, DRM_IOCTL_GEM_OPEN, &open_arg);

        if (r != 0) {

            free(bo);

            return NULL;

        }

        bo->handle = open_arg.handle;

    } else {

        struct drm_radeon_gem_create args;

        args.size = size;

        args.alignment = alignment;

        args.initial_domain = RADEON_GEM_DOMAIN_CPU;

        args.flags = 0;

        args.handle = 0;

        r = drmCommandWriteRead(fd, DRM_RADEON_GEM_CREATE,

                                &args, sizeof(args));

        bo->handle = args.handle;

        if (r) {

            fprintf(stderr, "Failed to allocate :\n");

            fprintf(stderr, "   size      : %d bytes\n", size);

            fprintf(stderr, "   alignment : %d bytes\n", alignment);

            free(bo);

            return NULL;

        }

    }

    if (ptr) {

        if (rbo_map(bo)) {

            fprintf(stderr, "%s failed to copy data into bo\n", __func__);

            return rbo_decref(bo);

        }

        memcpy(bo->data, ptr, size);

        rbo_unmap(bo);

    }

    return bo;

}

int rbo_map(struct rbo *bo)

{

    struct drm_radeon_gem_mmap args;

    void *ptr;

    int r;

    if (bo->mapcount++ != 0) {

        return 0;

    }

    /* Zero out args to make valgrind happy */

    memset(&args, 0, sizeof(args));

    args.handle = bo->handle;

    args.offset = 0;

    args.size = (uint64_t)bo->size;

    r = drmCommandWriteRead(bo->fd, DRM_RADEON_GEM_MMAP,

                            &args, sizeof(args));

    if (r) {

        fprintf(stderr, "error mapping %p 0x%08X (error = %d)\n",

            bo, bo->handle, r);

        return r;

    }

    ptr = mmap(0, args.size, PROT_READ|PROT_WRITE, MAP_SHARED, bo->fd, args.addr_ptr);

    if (ptr == MAP_FAILED) {

        fprintf(stderr, "%s failed to map bo\n", __func__);

        return -errno;

    }

    bo->data = ptr;

    return 0;

}

void rbo_unmap(struct rbo *bo)

{

    if (--bo->mapcount > 0) {

        return;

    }

    munmap(bo->data, bo->size);

    bo->data = NULL;

}

struct rbo *rbo_incref(struct rbo *bo)

{

    bo->refcount++;

    return bo;

}

struct rbo *rbo_decref(struct rbo *bo)

{

    struct drm_gem_close args;

    if (bo == NULL)

        return NULL;

    if (--bo->refcount > 0) {

        return NULL;

    }

    munmap(bo->data, bo->size);

    memset(&args, 0, sizeof(args));

    args.handle = bo->handle;

    drmIoctl(bo->fd, DRM_IOCTL_GEM_CLOSE, &args);

    memset(bo, 0, sizeof(struct rbo));

    free(bo);

    return NULL;

}

int rbo_wait(struct rbo *bo)

{

    struct drm_radeon_gem_wait_idle args;

    int ret;

    /* Zero out args to make valgrind happy */

    memset(&args, 0, sizeof(args));

    args.handle = bo->handle;

    do {

        ret = drmCommandWriteRead(bo->fd, DRM_RADEON_GEM_WAIT_IDLE,

                                  &args, sizeof(args));

    } while (ret == -EBUSY);

    return ret;

}