Jakob Bornecrantz | 9042d72 | 2010-01-08 02:51:04 +0000 | [diff] [blame] | 1 | /************************************************************************** |
| 2 | * |
| 3 | * Copyright © 2009 VMware, Inc., Palo Alto, CA., USA |
| 4 | * All Rights Reserved. |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 7 | * copy of this software and associated documentation files (the |
| 8 | * "Software"), to deal in the Software without restriction, including |
| 9 | * without limitation the rights to use, copy, modify, merge, publish, |
| 10 | * distribute, sub license, and/or sell copies of the Software, and to |
| 11 | * permit persons to whom the Software is furnished to do so, subject to |
| 12 | * the following conditions: |
| 13 | * |
| 14 | * The above copyright notice and this permission notice (including the |
| 15 | * next paragraph) shall be included in all copies or substantial portions |
| 16 | * of the Software. |
| 17 | * |
| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 20 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
| 21 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, |
| 22 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
| 23 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE |
| 24 | * USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 25 | * |
| 26 | **************************************************************************/ |
| 27 | /* |
| 28 | * Thanks to krh and jcristau for the tips on |
| 29 | * going from fd to pci id via fstat and udev. |
| 30 | */ |
| 31 | |
| 32 | |
Jakob Bornecrantz | d920fa9 | 2010-01-12 17:53:49 +0000 | [diff] [blame] | 33 | #include "config.h" |
Jakob Bornecrantz | 9042d72 | 2010-01-08 02:51:04 +0000 | [diff] [blame] | 34 | #include <errno.h> |
| 35 | #include <stdio.h> |
Jakob Bornecrantz | d920fa9 | 2010-01-12 17:53:49 +0000 | [diff] [blame] | 36 | #include <stdlib.h> |
Jakob Bornecrantz | 9042d72 | 2010-01-08 02:51:04 +0000 | [diff] [blame] | 37 | #include <xf86drm.h> |
Jakob Bornecrantz | d920fa9 | 2010-01-12 17:53:49 +0000 | [diff] [blame] | 38 | #include <string.h> |
| 39 | #include <unistd.h> |
| 40 | |
Jakob Bornecrantz | 9042d72 | 2010-01-08 02:51:04 +0000 | [diff] [blame] | 41 | #include <sys/stat.h> |
| 42 | |
| 43 | #include "internal.h" |
| 44 | |
Jakob Bornecrantz | d920fa9 | 2010-01-12 17:53:49 +0000 | [diff] [blame] | 45 | #define PATH_SIZE 512 |
| 46 | |
| 47 | static int |
| 48 | linux_name_from_sysfs(int fd, char **out) |
| 49 | { |
| 50 | char path[PATH_SIZE+1] = ""; /* initialize to please valgrind */ |
| 51 | char link[PATH_SIZE+1] = ""; |
| 52 | struct stat buffer; |
| 53 | unsigned maj, min; |
| 54 | char* slash_name; |
| 55 | int ret; |
| 56 | |
| 57 | /* |
| 58 | * Inside the sysfs directory for the device there is a symlink |
| 59 | * to the directory representing the driver module, that path |
| 60 | * happens to hold the name of the driver. |
| 61 | * |
| 62 | * So lets get the symlink for the drm device. Then read the link |
| 63 | * and filter out the last directory which happens to be the name |
| 64 | * of the driver, which we can use to load the correct interface. |
| 65 | * |
| 66 | * Thanks to Ray Strode of Plymouth for the code. |
| 67 | */ |
| 68 | |
| 69 | ret = fstat(fd, &buffer); |
| 70 | if (ret) |
| 71 | return ret; |
| 72 | |
| 73 | if (!S_ISCHR(buffer.st_mode)) |
| 74 | return -EINVAL; |
| 75 | |
| 76 | maj = major(buffer.st_rdev); |
| 77 | min = minor(buffer.st_rdev); |
| 78 | |
| 79 | snprintf(path, PATH_SIZE, "/sys/dev/char/%d:%d/device/driver", maj, min); |
| 80 | |
| 81 | if (readlink(path, link, PATH_SIZE) < 0) |
| 82 | return -EINVAL; |
| 83 | |
| 84 | /* link looks something like this: ../../../bus/pci/drivers/intel */ |
| 85 | slash_name = strrchr(link, '/'); |
| 86 | if (!slash_name) |
| 87 | return -EINVAL; |
| 88 | |
| 89 | /* copy name and at the same time remove the slash */ |
| 90 | *out = strdup(slash_name + 1); |
| 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | static int |
| 95 | linux_from_sysfs(int fd, struct kms_driver **out) |
| 96 | { |
| 97 | char *name; |
| 98 | int ret; |
| 99 | |
| 100 | ret = linux_name_from_sysfs(fd, &name); |
| 101 | if (ret) |
| 102 | return ret; |
| 103 | |
| 104 | if (!strcmp(name, "intel")) |
| 105 | ret = intel_create(fd, out); |
| 106 | #ifdef HAVE_VMWGFX |
| 107 | else if (!strcmp(name, "vmwgfx")) |
| 108 | ret = vmwgfx_create(fd, out); |
| 109 | #endif |
Marcin Kościelnicki | d5a2e77 | 2010-02-27 16:02:25 +0000 | [diff] [blame] | 110 | #ifdef HAVE_NOUVEAU |
| 111 | else if (!strcmp(name, "nouveau")) |
| 112 | ret = nouveau_create(fd, out); |
| 113 | #endif |
Jakob Bornecrantz | d920fa9 | 2010-01-12 17:53:49 +0000 | [diff] [blame] | 114 | else |
| 115 | ret = -ENOSYS; |
| 116 | |
| 117 | free(name); |
| 118 | return ret; |
| 119 | } |
| 120 | |
| 121 | #if 0 |
Jakob Bornecrantz | 9042d72 | 2010-01-08 02:51:04 +0000 | [diff] [blame] | 122 | #define LIBUDEV_I_KNOW_THE_API_IS_SUBJECT_TO_CHANGE |
| 123 | #include <libudev.h> |
| 124 | |
Jakob Bornecrantz | d920fa9 | 2010-01-12 17:53:49 +0000 | [diff] [blame] | 125 | struct create_record |
| 126 | { |
| 127 | unsigned vendor; |
| 128 | unsigned chip; |
| 129 | int (*func)(int fd, struct kms_driver **out); |
| 130 | }; |
| 131 | |
| 132 | static struct create_record table[] = { |
| 133 | { 0x8086, 0x2a42, intel_create }, /* i965 */ |
| 134 | #ifdef HAVE_VMWGFX |
| 135 | { 0x15ad, 0x0405, vmwgfx_create }, /* VMware vGPU */ |
| 136 | #endif |
| 137 | { 0, 0, NULL }, |
| 138 | }; |
| 139 | |
| 140 | static int |
| 141 | linux_get_pciid_from_fd(int fd, unsigned *vendor_id, unsigned *chip_id) |
Jakob Bornecrantz | 9042d72 | 2010-01-08 02:51:04 +0000 | [diff] [blame] | 142 | { |
| 143 | struct udev *udev; |
| 144 | struct udev_device *device; |
| 145 | struct udev_device *parent; |
| 146 | const char *pci_id; |
| 147 | struct stat buffer; |
| 148 | int ret; |
| 149 | |
| 150 | ret = fstat(fd, &buffer); |
| 151 | if (ret) |
| 152 | return -EINVAL; |
| 153 | |
| 154 | if (!S_ISCHR(buffer.st_mode)) |
| 155 | return -EINVAL; |
| 156 | |
| 157 | udev = udev_new(); |
| 158 | if (!udev) |
| 159 | return -ENOMEM; |
| 160 | |
| 161 | device = udev_device_new_from_devnum(udev, 'c', buffer.st_rdev); |
| 162 | if (!device) |
| 163 | goto err_free_udev; |
| 164 | |
| 165 | parent = udev_device_get_parent(device); |
| 166 | if (!parent) |
| 167 | goto err_free_device; |
| 168 | |
| 169 | pci_id = udev_device_get_property_value(parent, "PCI_ID"); |
| 170 | if (!pci_id) |
| 171 | goto err_free_device; |
| 172 | |
| 173 | if (sscanf(pci_id, "%x:%x", vendor_id, chip_id) != 2) |
| 174 | goto err_free_device; |
| 175 | |
| 176 | udev_device_unref(device); |
| 177 | udev_unref(udev); |
| 178 | |
| 179 | return 0; |
| 180 | |
| 181 | err_free_device: |
| 182 | udev_device_unref(device); |
| 183 | err_free_udev: |
| 184 | udev_unref(udev); |
| 185 | return -EINVAL; |
| 186 | } |
Jakob Bornecrantz | d920fa9 | 2010-01-12 17:53:49 +0000 | [diff] [blame] | 187 | |
| 188 | static int |
| 189 | linux_from_udev(int fd, struct kms_driver **out) |
| 190 | { |
| 191 | unsigned vendor_id, chip_id; |
| 192 | int ret, i; |
| 193 | |
| 194 | ret = linux_get_pciid_from_fd(fd, &vendor_id, &chip_id); |
| 195 | if (ret) |
| 196 | return ret; |
| 197 | |
| 198 | for (i = 0; table[i].func; i++) |
| 199 | if (table[i].vendor == vendor_id && table[i].chip == chip_id) |
| 200 | return table[i].func(fd, out); |
| 201 | |
| 202 | return -ENOSYS; |
| 203 | } |
| 204 | #else |
| 205 | static int |
| 206 | linux_from_udev(int fd, struct kms_driver **out) |
| 207 | { |
| 208 | return -ENOSYS; |
| 209 | } |
| 210 | #endif |
| 211 | |
| 212 | int |
| 213 | linux_create(int fd, struct kms_driver **out) |
| 214 | { |
| 215 | if (!linux_from_udev(fd, out)) |
| 216 | return 0; |
| 217 | |
| 218 | return linux_from_sysfs(fd, out); |
| 219 | } |