src/gallium/auxiliary/renderonly/renderonly.c

   1 /*
   2  * Copyright (C) 2016 Christian Gmeiner <christian.gmeiner@gmail.com>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  *
  23  * Authors:
  24  *    Christian Gmeiner <christian.gmeiner@gmail.com>
  25  */
  26
  27 #include "renderonly/renderonly.h"
  28
  29 #include <errno.h>
  30 #include <fcntl.h>
  31 #include <stdio.h>
  32 #include <xf86drm.h>
  33
  34 #include "state_tracker/drm_driver.h"
  35 #include "pipe/p_screen.h"
  36 #include "util/u_inlines.h"
  37 #include "util/u_memory.h"
  38
  39 struct renderonly *
  40 renderonly_dup(const struct renderonly *ro)
  41 {
  42    struct renderonly *copy;
  43
  44    copy = CALLOC_STRUCT(renderonly);
  45    if (!copy)
  46       return NULL;
  47
  48    memcpy(copy, ro, sizeof(*ro));
  49
  50    return copy;
  51 }
  52
  53 void
  54 renderonly_scanout_destroy(struct renderonly_scanout *scanout,
  55                            struct renderonly *ro)
  56 {
  57    struct drm_mode_destroy_dumb destroy_dumb = { };
  58
  59    if (ro->kms_fd != -1) {
  60       destroy_dumb.handle = scanout->handle;
  61       drmIoctl(ro->kms_fd, DRM_IOCTL_MODE_DESTROY_DUMB, &destroy_dumb);
  62    }
  63    FREE(scanout);
  64 }
  65
  66 struct renderonly_scanout *
  67 renderonly_create_kms_dumb_buffer_for_resource(struct pipe_resource *rsc,
  68                                                struct renderonly *ro,
  69                                                struct winsys_handle *out_handle)
  70 {
  71    struct renderonly_scanout *scanout;
  72    int err;
  73    struct drm_mode_create_dumb create_dumb = {
  74       .width = rsc->width0,
  75       .height = rsc->height0,
  76       .bpp = 32,
  77    };
  78    struct drm_mode_destroy_dumb destroy_dumb = { };
  79
  80    scanout = CALLOC_STRUCT(renderonly_scanout);
  81    if (!scanout)
  82       return NULL;
  83
  84    /* create dumb buffer at scanout GPU */
  85    err = drmIoctl(ro->kms_fd, DRM_IOCTL_MODE_CREATE_DUMB, &create_dumb);
  86    if (err < 0) {
  87       fprintf(stderr, "DRM_IOCTL_MODE_CREATE_DUMB failed: %s\n",
  88             strerror(errno));
  89       goto free_scanout;
  90    }
  91
  92    scanout->handle = create_dumb.handle;
  93    scanout->stride = create_dumb.pitch;
  94
  95    if (!out_handle)
  96       return scanout;
  97
  98    /* fill in winsys handle */
  99    memset(out_handle, 0, sizeof(*out_handle));
 100    out_handle->type = DRM_API_HANDLE_TYPE_FD;
 101    out_handle->stride = create_dumb.pitch;
 102
 103    err = drmPrimeHandleToFD(ro->kms_fd, create_dumb.handle, O_CLOEXEC,
 104          (int *)&out_handle->handle);
 105    if (err < 0) {
 106       fprintf(stderr, "failed to export dumb buffer: %s\n", strerror(errno));
 107       goto free_dumb;
 108    }
 109
 110    return scanout;
 111
 112 free_dumb:
 113    destroy_dumb.handle = scanout->handle;
 114    drmIoctl(ro->kms_fd, DRM_IOCTL_MODE_DESTROY_DUMB, &destroy_dumb);
 115
 116 free_scanout:
 117    FREE(scanout);
 118
 119    return NULL;
 120 }
 121
 122 struct renderonly_scanout *
 123 renderonly_create_gpu_import_for_resource(struct pipe_resource *rsc,
 124                                           struct renderonly *ro,
 125                                           struct winsys_handle *out_handle)
 126 {
 127    struct pipe_screen *screen = rsc->screen;
 128    struct renderonly_scanout *scanout;
 129    boolean status;
 130    int fd, err;
 131    struct winsys_handle handle = {
 132       .type = DRM_API_HANDLE_TYPE_FD
 133    };
 134
 135    scanout = CALLOC_STRUCT(renderonly_scanout);
 136    if (!scanout)
 137       return NULL;
 138
 139    status = screen->resource_get_handle(screen, NULL, rsc, &handle,
 140          PIPE_HANDLE_USAGE_READ_WRITE);
 141    if (!status)
 142       goto free_scanout;
 143
 144    scanout->stride = handle.stride;
 145    fd = handle.handle;
 146
 147    err = drmPrimeFDToHandle(ro->kms_fd, fd, &scanout->handle);
 148    close(fd);
 149
 150    if (err < 0) {
 151       fprintf(stderr, "drmPrimeFDToHandle() failed: %s\n", strerror(errno));
 152       goto free_scanout;
 153    }
 154
 155    return scanout;
 156
 157 free_scanout:
 158    FREE(scanout);
 159
 160    return NULL;
 161 }
 162