boot/bootmeth-uclass.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2021 Google LLC
   4  * Written by Simon Glass <[email protected]>
   5  */
   6
   7 #define LOG_CATEGORY UCLASS_BOOTSTD
   8
   9 #include <common.h>
  10 #include <blk.h>
  11 #include <bootflow.h>
  12 #include <bootmeth.h>
  13 #include <bootstd.h>
  14 #include <dm.h>
  15 #include <env_internal.h>
  16 #include <fs.h>
  17 #include <malloc.h>
  18 #include <mapmem.h>
  19 #include <dm/uclass-internal.h>
  20
  21 DECLARE_GLOBAL_DATA_PTR;
  22
  23 int bootmeth_get_state_desc(struct udevice *dev, char *buf, int maxsize)
  24 {
  25         const struct bootmeth_ops *ops = bootmeth_get_ops(dev);
  26
  27         if (!ops->get_state_desc)
  28                 return -ENOSYS;
  29
  30         return ops->get_state_desc(dev, buf, maxsize);
  31 }
  32
  33 int bootmeth_check(struct udevice *dev, struct bootflow_iter *iter)
  34 {
  35         const struct bootmeth_ops *ops = bootmeth_get_ops(dev);
  36
  37         if (!ops->check)
  38                 return 0;
  39
  40         return ops->check(dev, iter);
  41 }
  42
  43 int bootmeth_read_bootflow(struct udevice *dev, struct bootflow *bflow)
  44 {
  45         const struct bootmeth_ops *ops = bootmeth_get_ops(dev);
  46
  47         if (!ops->read_bootflow)
  48                 return -ENOSYS;
  49
  50         return ops->read_bootflow(dev, bflow);
  51 }
  52
  53 int bootmeth_set_bootflow(struct udevice *dev, struct bootflow *bflow,
  54                           char *buf, int size)
  55 {
  56         const struct bootmeth_ops *ops = bootmeth_get_ops(dev);
  57
  58         if (!ops->set_bootflow)
  59                 return -ENOSYS;
  60
  61         return ops->set_bootflow(dev, bflow, buf, size);
  62 }
  63
  64 int bootmeth_boot(struct udevice *dev, struct bootflow *bflow)
  65 {
  66         const struct bootmeth_ops *ops = bootmeth_get_ops(dev);
  67
  68         if (!ops->boot)
  69                 return -ENOSYS;
  70
  71         return ops->boot(dev, bflow);
  72 }
  73
  74 int bootmeth_read_file(struct udevice *dev, struct bootflow *bflow,
  75                        const char *file_path, ulong addr, ulong *sizep)
  76 {
  77         const struct bootmeth_ops *ops = bootmeth_get_ops(dev);
  78
  79         if (!ops->read_file)
  80                 return -ENOSYS;
  81
  82         return ops->read_file(dev, bflow, file_path, addr, sizep);
  83 }
  84
  85 int bootmeth_get_bootflow(struct udevice *dev, struct bootflow *bflow)
  86 {
  87         const struct bootmeth_ops *ops = bootmeth_get_ops(dev);
  88
  89         if (!ops->read_bootflow)
  90                 return -ENOSYS;
  91         bootflow_init(bflow, NULL, dev);
  92
  93         return ops->read_bootflow(dev, bflow);
  94 }
  95
  96 int bootmeth_setup_iter_order(struct bootflow_iter *iter, bool include_global)
  97 {
  98         struct bootstd_priv *std;
  99         struct udevice **order;
 100         int count;
 101         int ret;
 102
 103         ret = bootstd_get_priv(&std);
 104         if (ret)
 105                 return ret;
 106
 107         /* Create an array large enough */
 108         count = std->bootmeth_count ? std->bootmeth_count :
 109                 uclass_id_count(UCLASS_BOOTMETH);
 110         if (!count)
 111                 return log_msg_ret("count", -ENOENT);
 112
 113         order = calloc(count, sizeof(struct udevice *));
 114         if (!order)
 115                 return log_msg_ret("order", -ENOMEM);
 116
 117         /* If we have an ordering, copy it */
 118         if (IS_ENABLED(CONFIG_BOOTSTD_FULL) && std->bootmeth_count) {
 119                 int i;
 120
 121                 /*
 122                  * We don't support skipping global bootmeths. Instead, the user
 123                  * should omit them from the ordering
 124                  */
 125                 if (!include_global)
 126                         return log_msg_ret("glob", -EPERM);
 127                 memcpy(order, std->bootmeth_order,
 128                        count * sizeof(struct bootmeth *));
 129
 130                 if (IS_ENABLED(CONFIG_BOOTMETH_GLOBAL)) {
 131                         for (i = 0; i < count; i++) {
 132                                 struct udevice *dev = order[i];
 133                                 struct bootmeth_uc_plat *ucp;
 134                                 bool is_global;
 135
 136                                 ucp = dev_get_uclass_plat(dev);
 137                                 is_global = ucp->flags &
 138                                         BOOTMETHF_GLOBAL;
 139                                 if (is_global) {
 140                                         iter->first_glob_method = i;
 141                                         break;
 142                                 }
 143                         }
 144                 }
 145         } else {
 146                 struct udevice *dev;
 147                 int i, upto, pass;
 148
 149                 /*
 150                  * Do two passes, one to find the normal bootmeths and another
 151                  * to find the global ones, if required, The global ones go at
 152                  * the end.
 153                  */
 154                 for (pass = 0, upto = 0; pass < 1 + include_global; pass++) {
 155                         if (pass)
 156                                 iter->first_glob_method = upto;
 157                         /*
 158                          * Get a list of bootmethods, in seq order (i.e. using
 159                          * aliases). There may be gaps so try to count up high
 160                          * enough to find them all.
 161                          */
 162                         for (i = 0; upto < count && i < 20 + count * 2; i++) {
 163                                 struct bootmeth_uc_plat *ucp;
 164                                 bool is_global;
 165
 166                                 ret = uclass_get_device_by_seq(UCLASS_BOOTMETH,
 167                                                                i, &dev);
 168                                 if (ret)
 169                                         continue;
 170                                 ucp = dev_get_uclass_plat(dev);
 171                                 is_global =
 172                                         IS_ENABLED(CONFIG_BOOTMETH_GLOBAL) &&
 173                                         (ucp->flags & BOOTMETHF_GLOBAL);
 174                                 if (pass ? is_global : !is_global)
 175                                         order[upto++] = dev;
 176                         }
 177                 }
 178                 count = upto;
 179         }
 180         if (!count)
 181                 return log_msg_ret("count2", -ENOENT);
 182
 183         if (IS_ENABLED(CONFIG_BOOTMETH_GLOBAL) && include_global &&
 184             iter->first_glob_method != -1 && iter->first_glob_method != count) {
 185                 iter->cur_method = iter->first_glob_method;
 186                 iter->doing_global = true;
 187         }
 188         iter->method_order = order;
 189         iter->num_methods = count;
 190
 191         return 0;
 192 }
 193
 194 int bootmeth_set_order(const char *order_str)
 195 {
 196         struct bootstd_priv *std;
 197         struct udevice **order;
 198         int count, ret, i, len;
 199         const char *s, *p;
 200
 201         ret = bootstd_get_priv(&std);
 202         if (ret)
 203                 return ret;
 204
 205         if (!order_str) {
 206                 free(std->bootmeth_order);
 207                 std->bootmeth_order = NULL;
 208                 std->bootmeth_count = 0;
 209                 return 0;
 210         }
 211
 212         /* Create an array large enough */
 213         count = uclass_id_count(UCLASS_BOOTMETH);
 214         if (!count)
 215                 return log_msg_ret("count", -ENOENT);
 216
 217         order = calloc(count + 1, sizeof(struct udevice *));
 218         if (!order)
 219                 return log_msg_ret("order", -ENOMEM);
 220
 221         for (i = 0, s = order_str; *s && i < count; s = p + (*p == ' '), i++) {
 222                 struct udevice *dev;
 223
 224                 p = strchrnul(s, ' ');
 225                 len = p - s;
 226                 ret = uclass_find_device_by_namelen(UCLASS_BOOTMETH, s, len,
 227                                                     &dev);
 228                 if (ret) {
 229                         printf("Unknown bootmeth '%.*s'\n", len, s);
 230                         free(order);
 231                         return ret;
 232                 }
 233                 order[i] = dev;
 234         }
 235         order[i] = NULL;
 236         free(std->bootmeth_order);
 237         std->bootmeth_order = order;
 238         std->bootmeth_count = i;
 239
 240         return 0;
 241 }
 242
 243 /**
 244  * setup_fs() - Set up read to read a file
 245  *
 246  * We must redo the setup before each filesystem operation. This function
 247  * handles that, including setting the filesystem type if a block device is not
 248  * being used
 249  *
 250  * @bflow: Information about file to try
 251  * @desc: Block descriptor to read from (NULL if not a block device)
 252  * Return: 0 if OK, -ve on error
 253  */
 254 static int setup_fs(struct bootflow *bflow, struct blk_desc *desc)
 255 {
 256         int ret;
 257
 258         if (desc) {
 259                 ret = fs_set_blk_dev_with_part(desc, bflow->part);
 260                 if (ret)
 261                         return log_msg_ret("set", ret);
 262         } else if (IS_ENABLED(CONFIG_BOOTSTD_FULL) && bflow->fs_type) {
 263                 fs_set_type(bflow->fs_type);
 264         }
 265
 266         return 0;
 267 }
 268
 269 int bootmeth_try_file(struct bootflow *bflow, struct blk_desc *desc,
 270                       const char *prefix, const char *fname)
 271 {
 272         char path[200];
 273         loff_t size;
 274         int ret, ret2;
 275
 276         snprintf(path, sizeof(path), "%s%s", prefix ? prefix : "", fname);
 277         log_debug("trying: %s\n", path);
 278
 279         free(bflow->fname);
 280         bflow->fname = strdup(path);
 281         if (!bflow->fname)
 282                 return log_msg_ret("name", -ENOMEM);
 283
 284         if (IS_ENABLED(CONFIG_BOOTSTD_FULL) && bflow->fs_type)
 285                 fs_set_type(bflow->fs_type);
 286
 287         ret = fs_size(path, &size);
 288         log_debug("   %s - err=%d\n", path, ret);
 289
 290         /* Sadly FS closes the file after fs_size() so we must redo this */
 291         ret2 = setup_fs(bflow, desc);
 292         if (ret2)
 293                 return log_msg_ret("fs", ret2);
 294
 295         if (ret)
 296                 return log_msg_ret("size", ret);
 297
 298         bflow->size = size;
 299         bflow->state = BOOTFLOWST_FILE;
 300
 301         return 0;
 302 }
 303
 304 int bootmeth_alloc_file(struct bootflow *bflow, uint size_limit, uint align)
 305 {
 306         void *buf;
 307         uint size;
 308         int ret;
 309
 310         size = bflow->size;
 311         log_debug("   - script file size %x\n", size);
 312         if (size > size_limit)
 313                 return log_msg_ret("chk", -E2BIG);
 314
 315         ret = fs_read_alloc(bflow->fname, bflow->size, align, &buf);
 316         if (ret)
 317                 return log_msg_ret("all", ret);
 318
 319         bflow->state = BOOTFLOWST_READY;
 320         bflow->buf = buf;
 321
 322         return 0;
 323 }
 324
 325 int bootmeth_alloc_other(struct bootflow *bflow, const char *fname,
 326                          void **bufp, uint *sizep)
 327 {
 328         struct blk_desc *desc = NULL;
 329         char path[200];
 330         loff_t size;
 331         void *buf;
 332         int ret;
 333
 334         snprintf(path, sizeof(path), "%s%s", bflow->subdir, fname);
 335         log_debug("trying: %s\n", path);
 336
 337         if (bflow->blk)
 338                 desc = dev_get_uclass_plat(bflow->blk);
 339
 340         ret = setup_fs(bflow, desc);
 341         if (ret)
 342                 return log_msg_ret("fs", ret);
 343
 344         ret = fs_size(path, &size);
 345         log_debug("   %s - err=%d\n", path, ret);
 346
 347         ret = setup_fs(bflow, desc);
 348         if (ret)
 349                 return log_msg_ret("fs", ret);
 350
 351         ret = fs_read_alloc(path, size, 0, &buf);
 352         if (ret)
 353                 return log_msg_ret("all", ret);
 354
 355         *bufp = buf;
 356         *sizep = size;
 357
 358         return 0;
 359 }
 360
 361 int bootmeth_common_read_file(struct udevice *dev, struct bootflow *bflow,
 362                               const char *file_path, ulong addr, ulong *sizep)
 363 {
 364         struct blk_desc *desc = NULL;
 365         loff_t len_read;
 366         loff_t size;
 367         int ret;
 368
 369         if (bflow->blk)
 370                 desc = dev_get_uclass_plat(bflow->blk);
 371
 372         ret = setup_fs(bflow, desc);
 373         if (ret)
 374                 return log_msg_ret("fs", ret);
 375
 376         ret = fs_size(file_path, &size);
 377         if (ret)
 378                 return log_msg_ret("size", ret);
 379         if (size > *sizep)
 380                 return log_msg_ret("spc", -ENOSPC);
 381
 382         ret = setup_fs(bflow, desc);
 383         if (ret)
 384                 return log_msg_ret("fs", ret);
 385
 386         ret = fs_read(file_path, addr, 0, 0, &len_read);
 387         if (ret)
 388                 return ret;
 389         *sizep = len_read;
 390
 391         return 0;
 392 }
 393
 394 #ifdef CONFIG_BOOTSTD_FULL
 395 /**
 396  * on_bootmeths() - Update the bootmeth order
 397  *
 398  * This will check for a valid list of bootmeths and only apply it if valid.
 399  */
 400 static int on_bootmeths(const char *name, const char *value, enum env_op op,
 401                         int flags)
 402 {
 403         int ret;
 404
 405         switch (op) {
 406         case env_op_create:
 407         case env_op_overwrite:
 408                 ret = bootmeth_set_order(value);
 409                 if (ret)
 410                         return 1;
 411                 return 0;
 412         case env_op_delete:
 413                 bootmeth_set_order(NULL);
 414                 fallthrough;
 415         default:
 416                 return 0;
 417         }
 418 }
 419 U_BOOT_ENV_CALLBACK(bootmeths, on_bootmeths);
 420 #endif /* CONFIG_BOOTSTD_FULL */
 421
 422 UCLASS_DRIVER(bootmeth) = {
 423         .id             = UCLASS_BOOTMETH,
 424         .name           = "bootmeth",
 425         .flags          = DM_UC_FLAG_SEQ_ALIAS,
 426         .per_device_plat_auto   = sizeof(struct bootmeth_uc_plat),
 427 };