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 struct renderonly_scanout *
  54 renderonly_scanout_for_prime(struct pipe_resource *rsc, struct renderonly *ro)
  55 {
  56    struct renderonly_scanout *scanout;
  57
  58    scanout = CALLOC_STRUCT(renderonly_scanout);
  59    if (!scanout)
  60       return NULL;
  61
  62    scanout->prime = rsc;
  63
  64    return scanout;
  65 }
  66
  67 void
  68 renderonly_scanout_destroy(struct renderonly_scanout *scanout,
  69                            struct renderonly *ro)
  70 {
  71    struct drm_mode_destroy_dumb destroy_dumb = { };
  72
  73    pipe_resource_reference(&scanout->prime, NULL);
  74    if (ro->kms_fd != -1) {
  75       destroy_dumb.handle = scanout->handle;
  76       drmIoctl(ro->kms_fd, DRM_IOCTL_MODE_DESTROY_DUMB, &destroy_dumb);
  77    }
  78    FREE(scanout);
  79 }
  80
  81 struct renderonly_scanout *
  82 renderonly_create_kms_dumb_buffer_for_resource(struct pipe_resource *rsc,
  83                                                struct renderonly *ro)
  84 {
  85    struct pipe_screen *screen = rsc->screen;
  86    struct renderonly_scanout *scanout;
  87    struct winsys_handle handle;
  88    int prime_fd, err;
  89    struct drm_mode_create_dumb create_dumb = {
  90       .width = rsc->width0,
  91       .height = rsc->height0,
  92       .bpp = 32,
  93    };
  94    struct drm_mode_destroy_dumb destroy_dumb = { };
  95
  96    scanout = CALLOC_STRUCT(renderonly_scanout);
  97    if (!scanout)
  98       return NULL;
  99
 100    /* create dumb buffer at scanout GPU */
 101    err = drmIoctl(ro->kms_fd, DRM_IOCTL_MODE_CREATE_DUMB, &create_dumb);
 102    if (err < 0) {
 103       fprintf(stderr, "DRM_IOCTL_MODE_CREATE_DUMB failed: %s\n",
 104             strerror(errno));
 105       goto free_scanout;
 106    }
 107
 108    scanout->handle = create_dumb.handle;
 109    scanout->stride = create_dumb.pitch;
 110
 111    /* export dumb buffer */
 112    err = drmPrimeHandleToFD(ro->kms_fd, create_dumb.handle, O_CLOEXEC,
 113          &prime_fd);
 114    if (err < 0) {
 115       fprintf(stderr, "failed to export dumb buffer: %s\n", strerror(errno));
 116       goto free_dumb;
 117    }
 118
 119    /* import dumb buffer */
 120    handle.type = DRM_API_HANDLE_TYPE_FD;
 121    handle.handle = prime_fd;
 122    handle.stride = create_dumb.pitch;
 123
 124    scanout->prime = screen->resource_from_handle(screen, rsc,
 125          &handle, PIPE_HANDLE_USAGE_READ_WRITE);
 126
 127    close(prime_fd);
 128
 129    if (!scanout->prime) {
 130       fprintf(stderr, "failed to create resource_from_handle: %s\n", strerror(errno));
 131       goto free_dumb;
 132    }
 133
 134    return scanout;
 135
 136 free_dumb:
 137    destroy_dumb.handle = scanout->handle;
 138    drmIoctl(ro->kms_fd, DRM_IOCTL_MODE_DESTROY_DUMB, &destroy_dumb);
 139
 140 free_scanout:
 141    FREE(scanout);
 142
 143    return NULL;
 144 }
 145
 146 struct renderonly_scanout *
 147 renderonly_create_gpu_import_for_resource(struct pipe_resource *rsc,
 148                                           struct renderonly *ro)
 149 {
 150    struct pipe_screen *screen = rsc->screen;
 151    struct renderonly_scanout *scanout;
 152    boolean status;
 153    int fd, err;
 154    struct winsys_handle handle = {
 155       .type = DRM_API_HANDLE_TYPE_FD
 156    };
 157
 158    scanout = CALLOC_STRUCT(renderonly_scanout);
 159    if (!scanout)
 160       return NULL;
 161
 162    status = screen->resource_get_handle(screen, NULL, rsc, &handle,
 163          PIPE_HANDLE_USAGE_READ_WRITE);
 164    if (!status)
 165       goto free_scanout;
 166
 167    scanout->stride = handle.stride;
 168    fd = handle.handle;
 169
 170    err = drmPrimeFDToHandle(ro->kms_fd, fd, &scanout->handle);
 171    close(fd);
 172
 173    if (err < 0) {
 174       fprintf(stderr, "drmPrimeFDToHandle() failed: %s\n", strerror(errno));
 175       goto free_scanout;
 176    }
 177
 178    return scanout;
 179
 180 free_scanout:
 181    FREE(scanout);
 182
 183    return NULL;
 184 }
 185