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Commit | Line | Data |
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2a22d05d AG |
1 | /* |
2 | * EFI application disk support | |
3 | * | |
4 | * Copyright (c) 2016 Alexander Graf | |
5 | * | |
6 | * SPDX-License-Identifier: GPL-2.0+ | |
7 | */ | |
8 | ||
9 | #include <common.h> | |
6dd9faf8 | 10 | #include <blk.h> |
487d756f | 11 | #include <dm.h> |
2a22d05d AG |
12 | #include <efi_loader.h> |
13 | #include <inttypes.h> | |
14 | #include <part.h> | |
15 | #include <malloc.h> | |
16 | ||
17 | static const efi_guid_t efi_block_io_guid = BLOCK_IO_GUID; | |
18 | ||
19 | struct efi_disk_obj { | |
20 | /* Generic EFI object parent class data */ | |
21 | struct efi_object parent; | |
22 | /* EFI Interface callback struct for block I/O */ | |
23 | struct efi_block_io ops; | |
24 | /* U-Boot ifname for block device */ | |
25 | const char *ifname; | |
26 | /* U-Boot dev_index for block device */ | |
27 | int dev_index; | |
28 | /* EFI Interface Media descriptor struct, referenced by ops */ | |
29 | struct efi_block_io_media media; | |
30 | /* EFI device path to this block device */ | |
884bcf6f RC |
31 | struct efi_device_path *dp; |
32 | /* partition # */ | |
33 | unsigned int part; | |
2a92080d RC |
34 | /* handle to filesys proto (for partition objects) */ |
35 | struct efi_simple_file_system_protocol *volume; | |
8c3df0bf AG |
36 | /* Offset into disk for simple partitions */ |
37 | lbaint_t offset; | |
f9d334bd | 38 | /* Internal block device */ |
884bcf6f | 39 | struct blk_desc *desc; |
2a22d05d AG |
40 | }; |
41 | ||
2a22d05d AG |
42 | static efi_status_t EFIAPI efi_disk_reset(struct efi_block_io *this, |
43 | char extended_verification) | |
44 | { | |
45 | EFI_ENTRY("%p, %x", this, extended_verification); | |
46 | return EFI_EXIT(EFI_DEVICE_ERROR); | |
47 | } | |
48 | ||
49 | enum efi_disk_direction { | |
50 | EFI_DISK_READ, | |
51 | EFI_DISK_WRITE, | |
52 | }; | |
53 | ||
a80a232e | 54 | static efi_status_t efi_disk_rw_blocks(struct efi_block_io *this, |
2a22d05d AG |
55 | u32 media_id, u64 lba, unsigned long buffer_size, |
56 | void *buffer, enum efi_disk_direction direction) | |
57 | { | |
58 | struct efi_disk_obj *diskobj; | |
59 | struct blk_desc *desc; | |
60 | int blksz; | |
61 | int blocks; | |
62 | unsigned long n; | |
63 | ||
2a22d05d | 64 | diskobj = container_of(this, struct efi_disk_obj, ops); |
f9d334bd | 65 | desc = (struct blk_desc *) diskobj->desc; |
2a22d05d AG |
66 | blksz = desc->blksz; |
67 | blocks = buffer_size / blksz; | |
8c3df0bf | 68 | lba += diskobj->offset; |
2a22d05d | 69 | |
edcef3ba AG |
70 | debug("EFI: %s:%d blocks=%x lba=%"PRIx64" blksz=%x dir=%d\n", __func__, |
71 | __LINE__, blocks, lba, blksz, direction); | |
2a22d05d AG |
72 | |
73 | /* We only support full block access */ | |
74 | if (buffer_size & (blksz - 1)) | |
3304990b | 75 | return EFI_DEVICE_ERROR; |
2a22d05d AG |
76 | |
77 | if (direction == EFI_DISK_READ) | |
487d756f | 78 | n = blk_dread(desc, lba, blocks, buffer); |
2a22d05d | 79 | else |
487d756f | 80 | n = blk_dwrite(desc, lba, blocks, buffer); |
2a22d05d AG |
81 | |
82 | /* We don't do interrupts, so check for timers cooperatively */ | |
83 | efi_timer_check(); | |
84 | ||
edcef3ba AG |
85 | debug("EFI: %s:%d n=%lx blocks=%x\n", __func__, __LINE__, n, blocks); |
86 | ||
2a22d05d | 87 | if (n != blocks) |
3304990b | 88 | return EFI_DEVICE_ERROR; |
2a22d05d | 89 | |
3304990b | 90 | return EFI_SUCCESS; |
2a22d05d AG |
91 | } |
92 | ||
e275458c | 93 | static efi_status_t EFIAPI efi_disk_read_blocks(struct efi_block_io *this, |
2a22d05d AG |
94 | u32 media_id, u64 lba, unsigned long buffer_size, |
95 | void *buffer) | |
96 | { | |
51735ae0 AG |
97 | void *real_buffer = buffer; |
98 | efi_status_t r; | |
99 | ||
100 | #ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER | |
101 | if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) { | |
102 | r = efi_disk_read_blocks(this, media_id, lba, | |
103 | EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer); | |
104 | if (r != EFI_SUCCESS) | |
105 | return r; | |
106 | return efi_disk_read_blocks(this, media_id, lba + | |
107 | EFI_LOADER_BOUNCE_BUFFER_SIZE / this->media->block_size, | |
108 | buffer_size - EFI_LOADER_BOUNCE_BUFFER_SIZE, | |
109 | buffer + EFI_LOADER_BOUNCE_BUFFER_SIZE); | |
110 | } | |
111 | ||
112 | real_buffer = efi_bounce_buffer; | |
113 | #endif | |
114 | ||
115 | EFI_ENTRY("%p, %x, %"PRIx64", %lx, %p", this, media_id, lba, | |
116 | buffer_size, buffer); | |
117 | ||
118 | r = efi_disk_rw_blocks(this, media_id, lba, buffer_size, real_buffer, | |
119 | EFI_DISK_READ); | |
120 | ||
121 | /* Copy from bounce buffer to real buffer if necessary */ | |
122 | if ((r == EFI_SUCCESS) && (real_buffer != buffer)) | |
123 | memcpy(buffer, real_buffer, buffer_size); | |
124 | ||
125 | return EFI_EXIT(r); | |
2a22d05d AG |
126 | } |
127 | ||
e275458c | 128 | static efi_status_t EFIAPI efi_disk_write_blocks(struct efi_block_io *this, |
2a22d05d AG |
129 | u32 media_id, u64 lba, unsigned long buffer_size, |
130 | void *buffer) | |
131 | { | |
51735ae0 AG |
132 | void *real_buffer = buffer; |
133 | efi_status_t r; | |
134 | ||
135 | #ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER | |
136 | if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) { | |
137 | r = efi_disk_write_blocks(this, media_id, lba, | |
138 | EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer); | |
139 | if (r != EFI_SUCCESS) | |
140 | return r; | |
141 | return efi_disk_write_blocks(this, media_id, lba + | |
142 | EFI_LOADER_BOUNCE_BUFFER_SIZE / this->media->block_size, | |
143 | buffer_size - EFI_LOADER_BOUNCE_BUFFER_SIZE, | |
144 | buffer + EFI_LOADER_BOUNCE_BUFFER_SIZE); | |
145 | } | |
146 | ||
147 | real_buffer = efi_bounce_buffer; | |
148 | #endif | |
149 | ||
150 | EFI_ENTRY("%p, %x, %"PRIx64", %lx, %p", this, media_id, lba, | |
151 | buffer_size, buffer); | |
152 | ||
153 | /* Populate bounce buffer if necessary */ | |
154 | if (real_buffer != buffer) | |
155 | memcpy(real_buffer, buffer, buffer_size); | |
156 | ||
157 | r = efi_disk_rw_blocks(this, media_id, lba, buffer_size, real_buffer, | |
158 | EFI_DISK_WRITE); | |
159 | ||
160 | return EFI_EXIT(r); | |
2a22d05d AG |
161 | } |
162 | ||
163 | static efi_status_t EFIAPI efi_disk_flush_blocks(struct efi_block_io *this) | |
164 | { | |
165 | /* We always write synchronously */ | |
166 | EFI_ENTRY("%p", this); | |
167 | return EFI_EXIT(EFI_SUCCESS); | |
168 | } | |
169 | ||
170 | static const struct efi_block_io block_io_disk_template = { | |
171 | .reset = &efi_disk_reset, | |
172 | .read_blocks = &efi_disk_read_blocks, | |
173 | .write_blocks = &efi_disk_write_blocks, | |
174 | .flush_blocks = &efi_disk_flush_blocks, | |
175 | }; | |
176 | ||
2a92080d RC |
177 | /* |
178 | * Find filesystem from a device-path. The passed in path 'p' probably | |
179 | * contains one or more /File(name) nodes, so the comparison stops at | |
180 | * the first /File() node, and returns the pointer to that via 'rp'. | |
181 | * This is mostly intended to be a helper to map a device-path to an | |
182 | * efi_file_handle object. | |
183 | */ | |
184 | struct efi_simple_file_system_protocol * | |
185 | efi_fs_from_path(struct efi_device_path *fp) | |
186 | { | |
187 | struct efi_object *efiobj; | |
188 | struct efi_disk_obj *diskobj; | |
189 | ||
190 | efiobj = efi_dp_find_obj(fp, NULL); | |
191 | if (!efiobj) | |
192 | return NULL; | |
193 | ||
194 | diskobj = container_of(efiobj, struct efi_disk_obj, parent); | |
195 | ||
196 | return diskobj->volume; | |
197 | } | |
198 | ||
93945f2c HS |
199 | /* |
200 | * Create a device for a disk | |
201 | * | |
202 | * @name not used | |
203 | * @if_typename interface name for block device | |
204 | * @desc internal block device | |
205 | * @dev_index device index for block device | |
206 | * @offset offset into disk for simple partitions | |
207 | */ | |
487d756f SG |
208 | static void efi_disk_add_dev(const char *name, |
209 | const char *if_typename, | |
884bcf6f | 210 | struct blk_desc *desc, |
4a12a97c | 211 | int dev_index, |
884bcf6f RC |
212 | lbaint_t offset, |
213 | unsigned int part) | |
4a12a97c AG |
214 | { |
215 | struct efi_disk_obj *diskobj; | |
4b9f7aaf | 216 | efi_status_t ret; |
4a12a97c | 217 | |
0812d1a0 AG |
218 | /* Don't add empty devices */ |
219 | if (!desc->lba) | |
220 | return; | |
221 | ||
884bcf6f | 222 | diskobj = calloc(1, sizeof(*diskobj)); |
4b9f7aaf HS |
223 | if (!diskobj) |
224 | goto out_of_memory; | |
225 | ||
226 | /* Hook up to the device list */ | |
44549d62 | 227 | efi_add_handle(&diskobj->parent); |
4a12a97c AG |
228 | |
229 | /* Fill in object data */ | |
884bcf6f RC |
230 | diskobj->dp = efi_dp_from_part(desc, part); |
231 | diskobj->part = part; | |
4b9f7aaf HS |
232 | ret = efi_add_protocol(diskobj->parent.handle, &efi_block_io_guid, |
233 | &diskobj->ops); | |
234 | if (ret != EFI_SUCCESS) | |
235 | goto out_of_memory; | |
236 | ret = efi_add_protocol(diskobj->parent.handle, &efi_guid_device_path, | |
237 | diskobj->dp); | |
238 | if (ret != EFI_SUCCESS) | |
239 | goto out_of_memory; | |
2a92080d RC |
240 | if (part >= 1) { |
241 | diskobj->volume = efi_simple_file_system(desc, part, | |
242 | diskobj->dp); | |
4b9f7aaf HS |
243 | ret = efi_add_protocol(diskobj->parent.handle, |
244 | &efi_simple_file_system_protocol_guid, | |
245 | &diskobj->volume); | |
246 | if (ret != EFI_SUCCESS) | |
247 | goto out_of_memory; | |
2a92080d | 248 | } |
4a12a97c | 249 | diskobj->ops = block_io_disk_template; |
487d756f | 250 | diskobj->ifname = if_typename; |
4a12a97c | 251 | diskobj->dev_index = dev_index; |
8c3df0bf | 252 | diskobj->offset = offset; |
f9d334bd | 253 | diskobj->desc = desc; |
4a12a97c AG |
254 | |
255 | /* Fill in EFI IO Media info (for read/write callbacks) */ | |
256 | diskobj->media.removable_media = desc->removable; | |
257 | diskobj->media.media_present = 1; | |
258 | diskobj->media.block_size = desc->blksz; | |
259 | diskobj->media.io_align = desc->blksz; | |
0812d1a0 | 260 | diskobj->media.last_block = desc->lba - offset; |
5f770836 EV |
261 | if (part != 0) |
262 | diskobj->media.logical_partition = 1; | |
4a12a97c | 263 | diskobj->ops.media = &diskobj->media; |
4b9f7aaf HS |
264 | return; |
265 | out_of_memory: | |
266 | printf("ERROR: Out of memory\n"); | |
4a12a97c AG |
267 | } |
268 | ||
c034b7fd AG |
269 | static int efi_disk_create_partitions(struct blk_desc *desc, |
270 | const char *if_typename, | |
271 | int diskid, | |
272 | const char *pdevname) | |
8c3df0bf AG |
273 | { |
274 | int disks = 0; | |
ecbe1a07 | 275 | char devname[32] = { 0 }; /* dp->str is u16[32] long */ |
8c3df0bf | 276 | disk_partition_t info; |
16a73b24 | 277 | int part; |
8c3df0bf | 278 | |
c034b7fd | 279 | /* Add devices for each partition */ |
16a73b24 JG |
280 | for (part = 1; part <= MAX_SEARCH_PARTITIONS; part++) { |
281 | if (part_get_info(desc, part, &info)) | |
282 | continue; | |
f9d334bd AG |
283 | snprintf(devname, sizeof(devname), "%s:%d", pdevname, |
284 | part); | |
487d756f | 285 | efi_disk_add_dev(devname, if_typename, desc, diskid, |
884bcf6f | 286 | info.start, part); |
8c3df0bf AG |
287 | disks++; |
288 | } | |
884bcf6f | 289 | |
8c3df0bf AG |
290 | return disks; |
291 | } | |
292 | ||
2a22d05d AG |
293 | /* |
294 | * U-Boot doesn't have a list of all online disk devices. So when running our | |
295 | * EFI payload, we scan through all of the potentially available ones and | |
296 | * store them in our object pool. | |
297 | * | |
487d756f SG |
298 | * TODO(sjg@chromium.org): Actually with CONFIG_BLK, U-Boot does have this. |
299 | * Consider converting the code to look up devices as needed. The EFI device | |
300 | * could be a child of the UCLASS_BLK block device, perhaps. | |
301 | * | |
2a22d05d AG |
302 | * This gets called from do_bootefi_exec(). |
303 | */ | |
304 | int efi_disk_register(void) | |
305 | { | |
2a22d05d | 306 | int disks = 0; |
487d756f SG |
307 | #ifdef CONFIG_BLK |
308 | struct udevice *dev; | |
309 | ||
70bfcdc6 | 310 | for (uclass_first_device_check(UCLASS_BLK, &dev); |
487d756f | 311 | dev; |
70bfcdc6 | 312 | uclass_next_device_check(&dev)) { |
487d756f SG |
313 | struct blk_desc *desc = dev_get_uclass_platdata(dev); |
314 | const char *if_typename = dev->driver->name; | |
315 | ||
316 | printf("Scanning disk %s...\n", dev->name); | |
884bcf6f | 317 | |
c034b7fd | 318 | /* Add block device for the full device */ |
884bcf6f RC |
319 | efi_disk_add_dev(dev->name, if_typename, desc, |
320 | desc->devnum, 0, 0); | |
321 | ||
487d756f SG |
322 | disks++; |
323 | ||
c034b7fd AG |
324 | /* Partitions show up as block devices in EFI */ |
325 | disks += efi_disk_create_partitions(desc, if_typename, | |
326 | desc->devnum, dev->name); | |
487d756f SG |
327 | } |
328 | #else | |
329 | int i, if_type; | |
2a22d05d AG |
330 | |
331 | /* Search for all available disk devices */ | |
6dd9faf8 | 332 | for (if_type = 0; if_type < IF_TYPE_COUNT; if_type++) { |
487d756f SG |
333 | const struct blk_driver *cur_drvr; |
334 | const char *if_typename; | |
335 | ||
6dd9faf8 SG |
336 | cur_drvr = blk_driver_lookup_type(if_type); |
337 | if (!cur_drvr) | |
338 | continue; | |
339 | ||
487d756f SG |
340 | if_typename = cur_drvr->if_typename; |
341 | printf("Scanning disks on %s...\n", if_typename); | |
2a22d05d AG |
342 | for (i = 0; i < 4; i++) { |
343 | struct blk_desc *desc; | |
ecbe1a07 | 344 | char devname[32] = { 0 }; /* dp->str is u16[32] long */ |
2a22d05d | 345 | |
6dd9faf8 | 346 | desc = blk_get_devnum_by_type(if_type, i); |
2a22d05d AG |
347 | if (!desc) |
348 | continue; | |
349 | if (desc->type == DEV_TYPE_UNKNOWN) | |
350 | continue; | |
351 | ||
2a22d05d | 352 | snprintf(devname, sizeof(devname), "%s%d", |
487d756f | 353 | if_typename, i); |
77511b3b | 354 | |
c034b7fd | 355 | /* Add block device for the full device */ |
884bcf6f | 356 | efi_disk_add_dev(devname, if_typename, desc, i, 0, 0); |
2a22d05d | 357 | disks++; |
8c3df0bf | 358 | |
c034b7fd AG |
359 | /* Partitions show up as block devices in EFI */ |
360 | disks += efi_disk_create_partitions(desc, if_typename, | |
361 | i, devname); | |
2a22d05d AG |
362 | } |
363 | } | |
487d756f | 364 | #endif |
2a22d05d AG |
365 | printf("Found %d disks\n", disks); |
366 | ||
367 | return 0; | |
368 | } |