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[u-boot] / lib / efi_loader / efi_disk.c
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>
10 #include <blk.h>
11 #include <dm.h>
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 */
31         struct efi_device_path *dp;
32         /* partition # */
33         unsigned int part;
34         /* Offset into disk for simple partitions */
35         lbaint_t offset;
36         /* Internal block device */
37         struct blk_desc *desc;
38 };
39
40 static efi_status_t EFIAPI efi_disk_reset(struct efi_block_io *this,
41                         char extended_verification)
42 {
43         EFI_ENTRY("%p, %x", this, extended_verification);
44         return EFI_EXIT(EFI_DEVICE_ERROR);
45 }
46
47 enum efi_disk_direction {
48         EFI_DISK_READ,
49         EFI_DISK_WRITE,
50 };
51
52 static efi_status_t efi_disk_rw_blocks(struct efi_block_io *this,
53                         u32 media_id, u64 lba, unsigned long buffer_size,
54                         void *buffer, enum efi_disk_direction direction)
55 {
56         struct efi_disk_obj *diskobj;
57         struct blk_desc *desc;
58         int blksz;
59         int blocks;
60         unsigned long n;
61
62         diskobj = container_of(this, struct efi_disk_obj, ops);
63         desc = (struct blk_desc *) diskobj->desc;
64         blksz = desc->blksz;
65         blocks = buffer_size / blksz;
66         lba += diskobj->offset;
67
68         debug("EFI: %s:%d blocks=%x lba=%"PRIx64" blksz=%x dir=%d\n", __func__,
69               __LINE__, blocks, lba, blksz, direction);
70
71         /* We only support full block access */
72         if (buffer_size & (blksz - 1))
73                 return EFI_DEVICE_ERROR;
74
75         if (direction == EFI_DISK_READ)
76                 n = blk_dread(desc, lba, blocks, buffer);
77         else
78                 n = blk_dwrite(desc, lba, blocks, buffer);
79
80         /* We don't do interrupts, so check for timers cooperatively */
81         efi_timer_check();
82
83         debug("EFI: %s:%d n=%lx blocks=%x\n", __func__, __LINE__, n, blocks);
84
85         if (n != blocks)
86                 return EFI_DEVICE_ERROR;
87
88         return EFI_SUCCESS;
89 }
90
91 static efi_status_t EFIAPI efi_disk_read_blocks(struct efi_block_io *this,
92                         u32 media_id, u64 lba, unsigned long buffer_size,
93                         void *buffer)
94 {
95         void *real_buffer = buffer;
96         efi_status_t r;
97
98 #ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
99         if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) {
100                 r = efi_disk_read_blocks(this, media_id, lba,
101                         EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer);
102                 if (r != EFI_SUCCESS)
103                         return r;
104                 return efi_disk_read_blocks(this, media_id, lba +
105                         EFI_LOADER_BOUNCE_BUFFER_SIZE / this->media->block_size,
106                         buffer_size - EFI_LOADER_BOUNCE_BUFFER_SIZE,
107                         buffer + EFI_LOADER_BOUNCE_BUFFER_SIZE);
108         }
109
110         real_buffer = efi_bounce_buffer;
111 #endif
112
113         EFI_ENTRY("%p, %x, %"PRIx64", %lx, %p", this, media_id, lba,
114                   buffer_size, buffer);
115
116         r = efi_disk_rw_blocks(this, media_id, lba, buffer_size, real_buffer,
117                                EFI_DISK_READ);
118
119         /* Copy from bounce buffer to real buffer if necessary */
120         if ((r == EFI_SUCCESS) && (real_buffer != buffer))
121                 memcpy(buffer, real_buffer, buffer_size);
122
123         return EFI_EXIT(r);
124 }
125
126 static efi_status_t EFIAPI efi_disk_write_blocks(struct efi_block_io *this,
127                         u32 media_id, u64 lba, unsigned long buffer_size,
128                         void *buffer)
129 {
130         void *real_buffer = buffer;
131         efi_status_t r;
132
133 #ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
134         if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) {
135                 r = efi_disk_write_blocks(this, media_id, lba,
136                         EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer);
137                 if (r != EFI_SUCCESS)
138                         return r;
139                 return efi_disk_write_blocks(this, media_id, lba +
140                         EFI_LOADER_BOUNCE_BUFFER_SIZE / this->media->block_size,
141                         buffer_size - EFI_LOADER_BOUNCE_BUFFER_SIZE,
142                         buffer + EFI_LOADER_BOUNCE_BUFFER_SIZE);
143         }
144
145         real_buffer = efi_bounce_buffer;
146 #endif
147
148         EFI_ENTRY("%p, %x, %"PRIx64", %lx, %p", this, media_id, lba,
149                   buffer_size, buffer);
150
151         /* Populate bounce buffer if necessary */
152         if (real_buffer != buffer)
153                 memcpy(real_buffer, buffer, buffer_size);
154
155         r = efi_disk_rw_blocks(this, media_id, lba, buffer_size, real_buffer,
156                                EFI_DISK_WRITE);
157
158         return EFI_EXIT(r);
159 }
160
161 static efi_status_t EFIAPI efi_disk_flush_blocks(struct efi_block_io *this)
162 {
163         /* We always write synchronously */
164         EFI_ENTRY("%p", this);
165         return EFI_EXIT(EFI_SUCCESS);
166 }
167
168 static const struct efi_block_io block_io_disk_template = {
169         .reset = &efi_disk_reset,
170         .read_blocks = &efi_disk_read_blocks,
171         .write_blocks = &efi_disk_write_blocks,
172         .flush_blocks = &efi_disk_flush_blocks,
173 };
174
175 static void efi_disk_add_dev(const char *name,
176                              const char *if_typename,
177                              struct blk_desc *desc,
178                              int dev_index,
179                              lbaint_t offset,
180                              unsigned int part)
181 {
182         struct efi_disk_obj *diskobj;
183
184         /* Don't add empty devices */
185         if (!desc->lba)
186                 return;
187
188         diskobj = calloc(1, sizeof(*diskobj));
189
190         /* Fill in object data */
191         diskobj->dp = efi_dp_from_part(desc, part);
192         diskobj->part = part;
193         diskobj->parent.protocols[0].guid = &efi_block_io_guid;
194         diskobj->parent.protocols[0].protocol_interface = &diskobj->ops;
195         diskobj->parent.protocols[1].guid = &efi_guid_device_path;
196         diskobj->parent.protocols[1].protocol_interface = diskobj->dp;
197         diskobj->parent.handle = diskobj;
198         diskobj->ops = block_io_disk_template;
199         diskobj->ifname = if_typename;
200         diskobj->dev_index = dev_index;
201         diskobj->offset = offset;
202         diskobj->desc = desc;
203
204         /* Fill in EFI IO Media info (for read/write callbacks) */
205         diskobj->media.removable_media = desc->removable;
206         diskobj->media.media_present = 1;
207         diskobj->media.block_size = desc->blksz;
208         diskobj->media.io_align = desc->blksz;
209         diskobj->media.last_block = desc->lba - offset;
210         diskobj->ops.media = &diskobj->media;
211
212         /* Hook up to the device list */
213         list_add_tail(&diskobj->parent.link, &efi_obj_list);
214 }
215
216 static int efi_disk_create_eltorito(struct blk_desc *desc,
217                                     const char *if_typename,
218                                     int diskid,
219                                     const char *pdevname)
220 {
221         int disks = 0;
222 #if CONFIG_IS_ENABLED(ISO_PARTITION)
223         char devname[32] = { 0 }; /* dp->str is u16[32] long */
224         disk_partition_t info;
225         int part = 1;
226
227         if (desc->part_type != PART_TYPE_ISO)
228                 return 0;
229
230         /* and devices for each partition: */
231         while (!part_get_info(desc, part, &info)) {
232                 snprintf(devname, sizeof(devname), "%s:%d", pdevname,
233                          part);
234                 efi_disk_add_dev(devname, if_typename, desc, diskid,
235                                  info.start, part);
236                 part++;
237                 disks++;
238         }
239
240         /* ... and add block device: */
241         efi_disk_add_dev(devname, if_typename, desc, diskid, 0, 0);
242 #endif
243
244         return disks;
245 }
246
247 /*
248  * U-Boot doesn't have a list of all online disk devices. So when running our
249  * EFI payload, we scan through all of the potentially available ones and
250  * store them in our object pool.
251  *
252  * TODO(sjg@chromium.org): Actually with CONFIG_BLK, U-Boot does have this.
253  * Consider converting the code to look up devices as needed. The EFI device
254  * could be a child of the UCLASS_BLK block device, perhaps.
255  *
256  * This gets called from do_bootefi_exec().
257  */
258 int efi_disk_register(void)
259 {
260         int disks = 0;
261 #ifdef CONFIG_BLK
262         struct udevice *dev;
263
264         for (uclass_first_device_check(UCLASS_BLK, &dev);
265              dev;
266              uclass_next_device_check(&dev)) {
267                 struct blk_desc *desc = dev_get_uclass_platdata(dev);
268                 const char *if_typename = dev->driver->name;
269                 disk_partition_t info;
270                 int part = 1;
271
272                 printf("Scanning disk %s...\n", dev->name);
273
274                 /* add devices for each partition: */
275                 while (!part_get_info(desc, part, &info)) {
276                         efi_disk_add_dev(dev->name, if_typename, desc,
277                                          desc->devnum, 0, part);
278                         part++;
279                 }
280
281                 /* ... and add block device: */
282                 efi_disk_add_dev(dev->name, if_typename, desc,
283                                  desc->devnum, 0, 0);
284
285                 disks++;
286
287                 /*
288                 * El Torito images show up as block devices in an EFI world,
289                 * so let's create them here
290                 */
291                 disks += efi_disk_create_eltorito(desc, if_typename,
292                                                   desc->devnum, dev->name);
293         }
294 #else
295         int i, if_type;
296
297         /* Search for all available disk devices */
298         for (if_type = 0; if_type < IF_TYPE_COUNT; if_type++) {
299                 const struct blk_driver *cur_drvr;
300                 const char *if_typename;
301
302                 cur_drvr = blk_driver_lookup_type(if_type);
303                 if (!cur_drvr)
304                         continue;
305
306                 if_typename = cur_drvr->if_typename;
307                 printf("Scanning disks on %s...\n", if_typename);
308                 for (i = 0; i < 4; i++) {
309                         struct blk_desc *desc;
310                         char devname[32] = { 0 }; /* dp->str is u16[32] long */
311
312                         desc = blk_get_devnum_by_type(if_type, i);
313                         if (!desc)
314                                 continue;
315                         if (desc->type == DEV_TYPE_UNKNOWN)
316                                 continue;
317
318                         snprintf(devname, sizeof(devname), "%s%d",
319                                  if_typename, i);
320                         efi_disk_add_dev(devname, if_typename, desc, i, 0, 0);
321                         disks++;
322
323                         /*
324                          * El Torito images show up as block devices
325                          * in an EFI world, so let's create them here
326                          */
327                         disks += efi_disk_create_eltorito(desc, if_typename,
328                                                           i, devname);
329                 }
330         }
331 #endif
332         printf("Found %d disks\n", disks);
333
334         return 0;
335 }