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 TUNGSTEN GRAPHICS 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 <libudev.h>
  36 #include <xf86drm.h>
  37
  38 #include "state_tracker/drm_driver.h"
  39 #include "pipe_loader_priv.h"
  40
  41 #include "util/u_memory.h"
  42 #include "util/u_dl.h"
  43 #include "util/u_debug.h"
  44
  45 #define DRIVER_MAP_GALLIUM_ONLY
  46 #include "pci_ids/pci_id_driver_map.h"
  47
  48 struct pipe_loader_drm_device {
  49    struct pipe_loader_device base;
  50    struct util_dl_library *lib;
  51    int fd;
  52 };
  53
  54 #define pipe_loader_drm_device(dev) ((struct pipe_loader_drm_device *)dev)
  55
  56 static boolean
  57 find_drm_pci_id(struct pipe_loader_drm_device *ddev)
  58 {
  59    struct udev *udev = NULL;
  60    struct udev_device *parent, *device = NULL;
  61    struct stat stat;
  62    const char *pci_id;
  63
  64    if (fstat(ddev->fd, &stat) < 0)
  65       goto fail;
  66
  67    udev = udev_new();
  68    if (!udev)
  69       goto fail;
  70
  71    device = udev_device_new_from_devnum(udev, 'c', stat.st_rdev);
  72    if (!device)
  73       goto fail;
  74
  75    parent = udev_device_get_parent(device);
  76    if (!parent)
  77       goto fail;
  78
  79    pci_id = udev_device_get_property_value(parent, "PCI_ID");
  80    if (!pci_id ||
  81        sscanf(pci_id, "%x:%x", &ddev->base.u.pci.vendor_id,
  82               &ddev->base.u.pci.chip_id) != 2)
  83       goto fail;
  84
  85    return TRUE;
  86
  87   fail:
  88    if (device)
  89       udev_device_unref(device);
  90    if (udev)
  91       udev_unref(udev);
  92
  93    debug_printf("pci id for fd %d not found\n", ddev->fd);
  94    return FALSE;
  95 }
  96
  97 static boolean
  98 find_drm_driver_name(struct pipe_loader_drm_device *ddev)
  99 {
 100    struct pipe_loader_device *dev = &ddev->base;
 101    int i, j;
 102
 103    for (i = 0; driver_map[i].driver; i++) {
 104       if (dev->u.pci.vendor_id != driver_map[i].vendor_id)
 105          continue;
 106
 107       if (driver_map[i].num_chips_ids == -1) {
 108          dev->driver_name = driver_map[i].driver;
 109          goto found;
 110       }
 111
 112       for (j = 0; j < driver_map[i].num_chips_ids; j++) {
 113          if (dev->u.pci.chip_id == driver_map[i].chip_ids[j]) {
 114             dev->driver_name = driver_map[i].driver;
 115             goto found;
 116          }
 117       }
 118    }
 119
 120    return FALSE;
 121
 122   found:
 123    debug_printf("driver for %04x:%04x: %s\n", dev->u.pci.vendor_id,
 124                 dev->u.pci.chip_id, dev->driver_name);
 125    return TRUE;
 126 }
 127
 128 static struct pipe_loader_ops pipe_loader_drm_ops;
 129
 130 boolean
 131 pipe_loader_drm_probe_fd(struct pipe_loader_device **dev, int fd)
 132 {
 133    struct pipe_loader_drm_device *ddev = CALLOC_STRUCT(pipe_loader_drm_device);
 134
 135    ddev->base.type = PIPE_LOADER_DEVICE_PCI;
 136    ddev->base.ops = &pipe_loader_drm_ops;
 137    ddev->fd = fd;
 138
 139    if (!find_drm_pci_id(ddev))
 140       goto fail;
 141
 142    if (!find_drm_driver_name(ddev))
 143       goto fail;
 144
 145    *dev = &ddev->base;
 146    return TRUE;
 147
 148   fail:
 149    FREE(ddev);
 150    return FALSE;
 151 }
 152
 153 static int
 154 open_drm_minor(int minor)
 155 {
 156    char path[PATH_MAX];
 157    snprintf(path, sizeof(path), DRM_DEV_NAME, DRM_DIR_NAME, minor);
 158    return open(path, O_RDWR, 0);
 159 }
 160
 161 int
 162 pipe_loader_drm_probe(struct pipe_loader_device **devs, int ndev)
 163 {
 164    int i, j, fd;
 165
 166    for (i = 0, j = 0; i < DRM_MAX_MINOR; i++) {
 167       fd = open_drm_minor(i);
 168       if (fd < 0)
 169          continue;
 170
 171       if (j >= ndev || !pipe_loader_drm_probe_fd(&devs[j], fd))
 172          close(fd);
 173
 174       j++;
 175    }
 176
 177    return j;
 178 }
 179
 180 static void
 181 pipe_loader_drm_release(struct pipe_loader_device **dev)
 182 {
 183    struct pipe_loader_drm_device *ddev = pipe_loader_drm_device(*dev);
 184
 185    if (ddev->lib)
 186       util_dl_close(ddev->lib);
 187
 188    close(ddev->fd);
 189    FREE(ddev);
 190    *dev = NULL;
 191 }
 192
 193 static struct pipe_screen *
 194 pipe_loader_drm_create_screen(struct pipe_loader_device *dev,
 195                               const char *library_paths)
 196 {
 197    struct pipe_loader_drm_device *ddev = pipe_loader_drm_device(dev);
 198    const struct drm_driver_descriptor *dd;
 199
 200    if (!ddev->lib)
 201       ddev->lib = pipe_loader_find_module(dev, library_paths);
 202    if (!ddev->lib)
 203       return NULL;
 204
 205    dd = (const struct drm_driver_descriptor *)
 206       util_dl_get_proc_address(ddev->lib, "driver_descriptor");
 207
 208    /* sanity check on the name */
 209    if (!dd || strcmp(dd->name, ddev->base.driver_name) != 0)
 210       return NULL;
 211
 212    return dd->create_screen(ddev->fd);
 213 }
 214
 215 static struct pipe_loader_ops pipe_loader_drm_ops = {
 216    .create_screen = pipe_loader_drm_create_screen,
 217    .release = pipe_loader_drm_release
 218 };