efi_disk.c 12 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * EFI application disk support
  4. *
  5. * Copyright (c) 2016 Alexander Graf
  6. */
  7. #include <common.h>
  8. #include <blk.h>
  9. #include <dm.h>
  10. #include <efi_loader.h>
  11. #include <part.h>
  12. #include <malloc.h>
  13. const efi_guid_t efi_block_io_guid = BLOCK_IO_GUID;
  14. struct efi_disk_obj {
  15. /* Generic EFI object parent class data */
  16. struct efi_object parent;
  17. /* EFI Interface callback struct for block I/O */
  18. struct efi_block_io ops;
  19. /* U-Boot ifname for block device */
  20. const char *ifname;
  21. /* U-Boot dev_index for block device */
  22. int dev_index;
  23. /* EFI Interface Media descriptor struct, referenced by ops */
  24. struct efi_block_io_media media;
  25. /* EFI device path to this block device */
  26. struct efi_device_path *dp;
  27. /* partition # */
  28. unsigned int part;
  29. /* handle to filesys proto (for partition objects) */
  30. struct efi_simple_file_system_protocol *volume;
  31. /* Offset into disk for simple partitions */
  32. lbaint_t offset;
  33. /* Internal block device */
  34. struct blk_desc *desc;
  35. };
  36. static efi_status_t EFIAPI efi_disk_reset(struct efi_block_io *this,
  37. char extended_verification)
  38. {
  39. EFI_ENTRY("%p, %x", this, extended_verification);
  40. return EFI_EXIT(EFI_DEVICE_ERROR);
  41. }
  42. enum efi_disk_direction {
  43. EFI_DISK_READ,
  44. EFI_DISK_WRITE,
  45. };
  46. static efi_status_t efi_disk_rw_blocks(struct efi_block_io *this,
  47. u32 media_id, u64 lba, unsigned long buffer_size,
  48. void *buffer, enum efi_disk_direction direction)
  49. {
  50. struct efi_disk_obj *diskobj;
  51. struct blk_desc *desc;
  52. int blksz;
  53. int blocks;
  54. unsigned long n;
  55. diskobj = container_of(this, struct efi_disk_obj, ops);
  56. desc = (struct blk_desc *) diskobj->desc;
  57. blksz = desc->blksz;
  58. blocks = buffer_size / blksz;
  59. lba += diskobj->offset;
  60. debug("EFI: %s:%d blocks=%x lba=%llx blksz=%x dir=%d\n", __func__,
  61. __LINE__, blocks, lba, blksz, direction);
  62. /* We only support full block access */
  63. if (buffer_size & (blksz - 1))
  64. return EFI_DEVICE_ERROR;
  65. if (direction == EFI_DISK_READ)
  66. n = blk_dread(desc, lba, blocks, buffer);
  67. else
  68. n = blk_dwrite(desc, lba, blocks, buffer);
  69. /* We don't do interrupts, so check for timers cooperatively */
  70. efi_timer_check();
  71. debug("EFI: %s:%d n=%lx blocks=%x\n", __func__, __LINE__, n, blocks);
  72. if (n != blocks)
  73. return EFI_DEVICE_ERROR;
  74. return EFI_SUCCESS;
  75. }
  76. static efi_status_t EFIAPI efi_disk_read_blocks(struct efi_block_io *this,
  77. u32 media_id, u64 lba, efi_uintn_t buffer_size,
  78. void *buffer)
  79. {
  80. void *real_buffer = buffer;
  81. efi_status_t r;
  82. #ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
  83. if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) {
  84. r = efi_disk_read_blocks(this, media_id, lba,
  85. EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer);
  86. if (r != EFI_SUCCESS)
  87. return r;
  88. return efi_disk_read_blocks(this, media_id, lba +
  89. EFI_LOADER_BOUNCE_BUFFER_SIZE / this->media->block_size,
  90. buffer_size - EFI_LOADER_BOUNCE_BUFFER_SIZE,
  91. buffer + EFI_LOADER_BOUNCE_BUFFER_SIZE);
  92. }
  93. real_buffer = efi_bounce_buffer;
  94. #endif
  95. EFI_ENTRY("%p, %x, %llx, %zx, %p", this, media_id, lba,
  96. buffer_size, buffer);
  97. r = efi_disk_rw_blocks(this, media_id, lba, buffer_size, real_buffer,
  98. EFI_DISK_READ);
  99. /* Copy from bounce buffer to real buffer if necessary */
  100. if ((r == EFI_SUCCESS) && (real_buffer != buffer))
  101. memcpy(buffer, real_buffer, buffer_size);
  102. return EFI_EXIT(r);
  103. }
  104. static efi_status_t EFIAPI efi_disk_write_blocks(struct efi_block_io *this,
  105. u32 media_id, u64 lba, efi_uintn_t buffer_size,
  106. void *buffer)
  107. {
  108. void *real_buffer = buffer;
  109. efi_status_t r;
  110. #ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
  111. if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) {
  112. r = efi_disk_write_blocks(this, media_id, lba,
  113. EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer);
  114. if (r != EFI_SUCCESS)
  115. return r;
  116. return efi_disk_write_blocks(this, media_id, lba +
  117. EFI_LOADER_BOUNCE_BUFFER_SIZE / this->media->block_size,
  118. buffer_size - EFI_LOADER_BOUNCE_BUFFER_SIZE,
  119. buffer + EFI_LOADER_BOUNCE_BUFFER_SIZE);
  120. }
  121. real_buffer = efi_bounce_buffer;
  122. #endif
  123. EFI_ENTRY("%p, %x, %llx, %zx, %p", this, media_id, lba,
  124. buffer_size, buffer);
  125. /* Populate bounce buffer if necessary */
  126. if (real_buffer != buffer)
  127. memcpy(real_buffer, buffer, buffer_size);
  128. r = efi_disk_rw_blocks(this, media_id, lba, buffer_size, real_buffer,
  129. EFI_DISK_WRITE);
  130. return EFI_EXIT(r);
  131. }
  132. static efi_status_t EFIAPI efi_disk_flush_blocks(struct efi_block_io *this)
  133. {
  134. /* We always write synchronously */
  135. EFI_ENTRY("%p", this);
  136. return EFI_EXIT(EFI_SUCCESS);
  137. }
  138. static const struct efi_block_io block_io_disk_template = {
  139. .reset = &efi_disk_reset,
  140. .read_blocks = &efi_disk_read_blocks,
  141. .write_blocks = &efi_disk_write_blocks,
  142. .flush_blocks = &efi_disk_flush_blocks,
  143. };
  144. /*
  145. * Get the simple file system protocol for a file device path.
  146. *
  147. * The full path provided is split into device part and into a file
  148. * part. The device part is used to find the handle on which the
  149. * simple file system protocol is installed.
  150. *
  151. * @full_path device path including device and file
  152. * @return simple file system protocol
  153. */
  154. struct efi_simple_file_system_protocol *
  155. efi_fs_from_path(struct efi_device_path *full_path)
  156. {
  157. struct efi_object *efiobj;
  158. struct efi_handler *handler;
  159. struct efi_device_path *device_path;
  160. struct efi_device_path *file_path;
  161. efi_status_t ret;
  162. /* Split the path into a device part and a file part */
  163. ret = efi_dp_split_file_path(full_path, &device_path, &file_path);
  164. if (ret != EFI_SUCCESS)
  165. return NULL;
  166. efi_free_pool(file_path);
  167. /* Get the EFI object for the partition */
  168. efiobj = efi_dp_find_obj(device_path, NULL);
  169. efi_free_pool(device_path);
  170. if (!efiobj)
  171. return NULL;
  172. /* Find the simple file system protocol */
  173. ret = efi_search_protocol(efiobj, &efi_simple_file_system_protocol_guid,
  174. &handler);
  175. if (ret != EFI_SUCCESS)
  176. return NULL;
  177. /* Return the simple file system protocol for the partition */
  178. return handler->protocol_interface;
  179. }
  180. /*
  181. * Create a handle for a partition or disk
  182. *
  183. * @parent parent handle
  184. * @dp_parent parent device path
  185. * @if_typename interface name for block device
  186. * @desc internal block device
  187. * @dev_index device index for block device
  188. * @offset offset into disk for simple partitions
  189. * @return disk object
  190. */
  191. static efi_status_t efi_disk_add_dev(
  192. efi_handle_t parent,
  193. struct efi_device_path *dp_parent,
  194. const char *if_typename,
  195. struct blk_desc *desc,
  196. int dev_index,
  197. lbaint_t offset,
  198. unsigned int part,
  199. struct efi_disk_obj **disk)
  200. {
  201. struct efi_disk_obj *diskobj;
  202. efi_status_t ret;
  203. /* Don't add empty devices */
  204. if (!desc->lba)
  205. return EFI_NOT_READY;
  206. diskobj = calloc(1, sizeof(*diskobj));
  207. if (!diskobj)
  208. return EFI_OUT_OF_RESOURCES;
  209. /* Hook up to the device list */
  210. efi_add_handle(&diskobj->parent);
  211. /* Fill in object data */
  212. if (part) {
  213. struct efi_device_path *node = efi_dp_part_node(desc, part);
  214. diskobj->dp = efi_dp_append_node(dp_parent, node);
  215. efi_free_pool(node);
  216. } else {
  217. diskobj->dp = efi_dp_from_part(desc, part);
  218. }
  219. diskobj->part = part;
  220. ret = efi_add_protocol(diskobj->parent.handle, &efi_block_io_guid,
  221. &diskobj->ops);
  222. if (ret != EFI_SUCCESS)
  223. return ret;
  224. ret = efi_add_protocol(diskobj->parent.handle, &efi_guid_device_path,
  225. diskobj->dp);
  226. if (ret != EFI_SUCCESS)
  227. return ret;
  228. if (part >= 1) {
  229. diskobj->volume = efi_simple_file_system(desc, part,
  230. diskobj->dp);
  231. ret = efi_add_protocol(diskobj->parent.handle,
  232. &efi_simple_file_system_protocol_guid,
  233. diskobj->volume);
  234. if (ret != EFI_SUCCESS)
  235. return ret;
  236. }
  237. diskobj->ops = block_io_disk_template;
  238. diskobj->ifname = if_typename;
  239. diskobj->dev_index = dev_index;
  240. diskobj->offset = offset;
  241. diskobj->desc = desc;
  242. /* Fill in EFI IO Media info (for read/write callbacks) */
  243. diskobj->media.removable_media = desc->removable;
  244. diskobj->media.media_present = 1;
  245. diskobj->media.block_size = desc->blksz;
  246. diskobj->media.io_align = desc->blksz;
  247. diskobj->media.last_block = desc->lba - offset;
  248. if (part != 0)
  249. diskobj->media.logical_partition = 1;
  250. diskobj->ops.media = &diskobj->media;
  251. if (disk)
  252. *disk = diskobj;
  253. return EFI_SUCCESS;
  254. }
  255. /*
  256. * Create handles and protocols for the partitions of a block device
  257. *
  258. * @parent handle of the parent disk
  259. * @blk_desc block device
  260. * @if_typename interface type
  261. * @diskid device number
  262. * @pdevname device name
  263. * @return number of partitions created
  264. */
  265. int efi_disk_create_partitions(efi_handle_t parent, struct blk_desc *desc,
  266. const char *if_typename, int diskid,
  267. const char *pdevname)
  268. {
  269. int disks = 0;
  270. char devname[32] = { 0 }; /* dp->str is u16[32] long */
  271. disk_partition_t info;
  272. int part;
  273. struct efi_device_path *dp = NULL;
  274. efi_status_t ret;
  275. struct efi_handler *handler;
  276. /* Get the device path of the parent */
  277. ret = efi_search_protocol(parent, &efi_guid_device_path, &handler);
  278. if (ret == EFI_SUCCESS)
  279. dp = handler->protocol_interface;
  280. /* Add devices for each partition */
  281. for (part = 1; part <= MAX_SEARCH_PARTITIONS; part++) {
  282. if (part_get_info(desc, part, &info))
  283. continue;
  284. snprintf(devname, sizeof(devname), "%s:%d", pdevname,
  285. part);
  286. ret = efi_disk_add_dev(parent, dp, if_typename, desc, diskid,
  287. info.start, part, NULL);
  288. if (ret != EFI_SUCCESS) {
  289. printf("Adding partition %s failed\n", pdevname);
  290. continue;
  291. }
  292. disks++;
  293. }
  294. return disks;
  295. }
  296. /*
  297. * U-Boot doesn't have a list of all online disk devices. So when running our
  298. * EFI payload, we scan through all of the potentially available ones and
  299. * store them in our object pool.
  300. *
  301. * TODO(sjg@chromium.org): Actually with CONFIG_BLK, U-Boot does have this.
  302. * Consider converting the code to look up devices as needed. The EFI device
  303. * could be a child of the UCLASS_BLK block device, perhaps.
  304. *
  305. * This gets called from do_bootefi_exec().
  306. */
  307. efi_status_t efi_disk_register(void)
  308. {
  309. struct efi_disk_obj *disk;
  310. int disks = 0;
  311. efi_status_t ret;
  312. #ifdef CONFIG_BLK
  313. struct udevice *dev;
  314. for (uclass_first_device_check(UCLASS_BLK, &dev); dev;
  315. uclass_next_device_check(&dev)) {
  316. struct blk_desc *desc = dev_get_uclass_platdata(dev);
  317. const char *if_typename = blk_get_if_type_name(desc->if_type);
  318. /* Add block device for the full device */
  319. printf("Scanning disk %s...\n", dev->name);
  320. ret = efi_disk_add_dev(NULL, NULL, if_typename,
  321. desc, desc->devnum, 0, 0, &disk);
  322. if (ret == EFI_NOT_READY) {
  323. printf("Disk %s not ready\n", dev->name);
  324. continue;
  325. }
  326. if (ret) {
  327. printf("ERROR: failure to add disk device %s, r = %lu\n",
  328. dev->name, ret & ~EFI_ERROR_MASK);
  329. return ret;
  330. }
  331. disks++;
  332. /* Partitions show up as block devices in EFI */
  333. disks += efi_disk_create_partitions(
  334. disk->parent.handle, desc, if_typename,
  335. desc->devnum, dev->name);
  336. }
  337. #else
  338. int i, if_type;
  339. /* Search for all available disk devices */
  340. for (if_type = 0; if_type < IF_TYPE_COUNT; if_type++) {
  341. const struct blk_driver *cur_drvr;
  342. const char *if_typename;
  343. cur_drvr = blk_driver_lookup_type(if_type);
  344. if (!cur_drvr)
  345. continue;
  346. if_typename = cur_drvr->if_typename;
  347. printf("Scanning disks on %s...\n", if_typename);
  348. for (i = 0; i < 4; i++) {
  349. struct blk_desc *desc;
  350. char devname[32] = { 0 }; /* dp->str is u16[32] long */
  351. desc = blk_get_devnum_by_type(if_type, i);
  352. if (!desc)
  353. continue;
  354. if (desc->type == DEV_TYPE_UNKNOWN)
  355. continue;
  356. snprintf(devname, sizeof(devname), "%s%d",
  357. if_typename, i);
  358. /* Add block device for the full device */
  359. ret = efi_disk_add_dev(NULL, NULL, if_typename, desc,
  360. i, 0, 0, &disk);
  361. if (ret == EFI_NOT_READY) {
  362. printf("Disk %s not ready\n", devname);
  363. continue;
  364. }
  365. if (ret) {
  366. printf("ERROR: failure to add disk device %s, r = %lu\n",
  367. devname, ret & ~EFI_ERROR_MASK);
  368. return ret;
  369. }
  370. disks++;
  371. /* Partitions show up as block devices in EFI */
  372. disks += efi_disk_create_partitions(
  373. disk->parent.handle, desc,
  374. if_typename, i, devname);
  375. }
  376. }
  377. #endif
  378. printf("Found %d disks\n", disks);
  379. return EFI_SUCCESS;
  380. }