src/gallium/auxiliary/pipe-loader/pipe_loader_drm.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2011 Intel Corporation
   4  * Copyright 2012 Francisco Jerez
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  * Authors:
  28  *    Kristian Høgsberg <krh@bitplanet.net>
  29  *    Benjamin Franzke <benjaminfranzke@googlemail.com>
  30  *
  31  **************************************************************************/
  32
  33 #include <fcntl.h>
  34 #include <stdio.h>
  35 #include <xf86drm.h>
  36 #include <unistd.h>
  37
  38 #include "loader.h"
  39 #include "state_tracker/drm_driver.h"
  40 #include "pipe_loader_priv.h"
  41
  42 #include "util/u_memory.h"
  43 #include "util/u_dl.h"
  44 #include "util/u_debug.h"
  45
  46 #define DRM_RENDER_NODE_DEV_NAME_FORMAT "%s/renderD%d"
  47 #define DRM_RENDER_NODE_MAX_NODES 63
  48 #define DRM_RENDER_NODE_MIN_MINOR 128
  49 #define DRM_RENDER_NODE_MAX_MINOR (DRM_RENDER_NODE_MIN_MINOR + DRM_RENDER_NODE_MAX_NODES)
  50
  51 struct pipe_loader_drm_device {
  52    struct pipe_loader_device base;
  53    struct util_dl_library *lib;
  54    int fd;
  55 };
  56
  57 #define pipe_loader_drm_device(dev) ((struct pipe_loader_drm_device *)dev)
  58
  59 static struct pipe_loader_ops pipe_loader_drm_ops;
  60
  61 bool
  62 pipe_loader_drm_probe_fd(struct pipe_loader_device **dev, int fd)
  63 {
  64    struct pipe_loader_drm_device *ddev = CALLOC_STRUCT(pipe_loader_drm_device);
  65    int vendor_id, chip_id;
  66
  67    if (!ddev)
  68       return false;
  69
  70    if (loader_get_pci_id_for_fd(fd, &vendor_id, &chip_id)) {
  71       ddev->base.type = PIPE_LOADER_DEVICE_PCI;
  72       ddev->base.u.pci.vendor_id = vendor_id;
  73       ddev->base.u.pci.chip_id = chip_id;
  74    } else {
  75       ddev->base.type = PIPE_LOADER_DEVICE_PLATFORM;
  76    }
  77    ddev->base.ops = &pipe_loader_drm_ops;
  78    ddev->fd = fd;
  79
  80    ddev->base.driver_name = loader_get_driver_for_fd(fd, _LOADER_GALLIUM);
  81    if (!ddev->base.driver_name)
  82       goto fail;
  83
  84    *dev = &ddev->base;
  85    return true;
  86
  87   fail:
  88    FREE(ddev);
  89    return false;
  90 }
  91
  92 static int
  93 open_drm_render_node_minor(int minor)
  94 {
  95    char path[PATH_MAX];
  96    snprintf(path, sizeof(path), DRM_RENDER_NODE_DEV_NAME_FORMAT, DRM_DIR_NAME,
  97             minor);
  98    return loader_open_device(path);
  99 }
 100
 101 int
 102 pipe_loader_drm_probe(struct pipe_loader_device **devs, int ndev)
 103 {
 104    int i, j, fd;
 105
 106    for (i = DRM_RENDER_NODE_MIN_MINOR, j = 0;
 107         i <= DRM_RENDER_NODE_MAX_MINOR; i++) {
 108       fd = open_drm_render_node_minor(i);
 109       struct pipe_loader_device *dev;
 110       if (fd < 0)
 111          continue;
 112
 113       if (!pipe_loader_drm_probe_fd(&dev, fd)) {
 114          close(fd);
 115          continue;
 116       }
 117
 118       if (j < ndev) {
 119          devs[j] = dev;
 120       } else {
 121          close(fd);
 122          dev->ops->release(&dev);
 123       }
 124       j++;
 125    }
 126
 127    return j;
 128 }
 129
 130 static void
 131 pipe_loader_drm_release(struct pipe_loader_device **dev)
 132 {
 133    struct pipe_loader_drm_device *ddev = pipe_loader_drm_device(*dev);
 134
 135    if (ddev->lib)
 136       util_dl_close(ddev->lib);
 137
 138    close(ddev->fd);
 139    FREE(ddev->base.driver_name);
 140    FREE(ddev);
 141    *dev = NULL;
 142 }
 143
 144 static const struct drm_conf_ret *
 145 pipe_loader_drm_configuration(struct pipe_loader_device *dev,
 146                               enum drm_conf conf)
 147 {
 148    struct pipe_loader_drm_device *ddev = pipe_loader_drm_device(dev);
 149    const struct drm_driver_descriptor *dd;
 150
 151    if (!ddev->lib)
 152       return NULL;
 153
 154    dd = (const struct drm_driver_descriptor *)
 155       util_dl_get_proc_address(ddev->lib, "driver_descriptor");
 156
 157    /* sanity check on the name */
 158    if (!dd || strcmp(dd->name, ddev->base.driver_name) != 0)
 159       return NULL;
 160
 161    if (!dd->configuration)
 162       return NULL;
 163
 164    return dd->configuration(conf);
 165 }
 166
 167 static struct pipe_screen *
 168 pipe_loader_drm_create_screen(struct pipe_loader_device *dev,
 169                               const char *library_paths)
 170 {
 171    struct pipe_loader_drm_device *ddev = pipe_loader_drm_device(dev);
 172    const struct drm_driver_descriptor *dd;
 173
 174    if (!ddev->lib)
 175       ddev->lib = pipe_loader_find_module(dev, library_paths);
 176    if (!ddev->lib)
 177       return NULL;
 178
 179    dd = (const struct drm_driver_descriptor *)
 180       util_dl_get_proc_address(ddev->lib, "driver_descriptor");
 181
 182    /* sanity check on the name */
 183    if (!dd || strcmp(dd->name, ddev->base.driver_name) != 0)
 184       return NULL;
 185
 186    return dd->create_screen(ddev->fd);
 187 }
 188
 189 static struct pipe_loader_ops pipe_loader_drm_ops = {
 190    .create_screen = pipe_loader_drm_create_screen,
 191    .configuration = pipe_loader_drm_configuration,
 192    .release = pipe_loader_drm_release
 193 };