sandbox.c 5.3 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Copyright (C) 2013 Henrik Nordstrom <henrik@henriknordstrom.net>
  4. */
  5. #include <common.h>
  6. #include <blk.h>
  7. #include <dm.h>
  8. #include <fdtdec.h>
  9. #include <part.h>
  10. #include <os.h>
  11. #include <malloc.h>
  12. #include <sandboxblockdev.h>
  13. #include <dm/device_compat.h>
  14. #include <linux/errno.h>
  15. #include <dm/device-internal.h>
  16. DECLARE_GLOBAL_DATA_PTR;
  17. #ifndef CONFIG_BLK
  18. static struct host_block_dev host_devices[CONFIG_HOST_MAX_DEVICES];
  19. static struct host_block_dev *find_host_device(int dev)
  20. {
  21. if (dev >= 0 && dev < CONFIG_HOST_MAX_DEVICES)
  22. return &host_devices[dev];
  23. return NULL;
  24. }
  25. #endif
  26. #ifdef CONFIG_BLK
  27. static unsigned long host_block_read(struct udevice *dev,
  28. unsigned long start, lbaint_t blkcnt,
  29. void *buffer)
  30. {
  31. struct host_block_dev *host_dev = dev_get_platdata(dev);
  32. struct blk_desc *block_dev = dev_get_uclass_platdata(dev);
  33. #else
  34. static unsigned long host_block_read(struct blk_desc *block_dev,
  35. unsigned long start, lbaint_t blkcnt,
  36. void *buffer)
  37. {
  38. int dev = block_dev->devnum;
  39. struct host_block_dev *host_dev = find_host_device(dev);
  40. if (!host_dev)
  41. return -1;
  42. #endif
  43. if (os_lseek(host_dev->fd, start * block_dev->blksz, OS_SEEK_SET) ==
  44. -1) {
  45. printf("ERROR: Invalid block %lx\n", start);
  46. return -1;
  47. }
  48. ssize_t len = os_read(host_dev->fd, buffer, blkcnt * block_dev->blksz);
  49. if (len >= 0)
  50. return len / block_dev->blksz;
  51. return -1;
  52. }
  53. #ifdef CONFIG_BLK
  54. static unsigned long host_block_write(struct udevice *dev,
  55. unsigned long start, lbaint_t blkcnt,
  56. const void *buffer)
  57. {
  58. struct host_block_dev *host_dev = dev_get_platdata(dev);
  59. struct blk_desc *block_dev = dev_get_uclass_platdata(dev);
  60. #else
  61. static unsigned long host_block_write(struct blk_desc *block_dev,
  62. unsigned long start, lbaint_t blkcnt,
  63. const void *buffer)
  64. {
  65. int dev = block_dev->devnum;
  66. struct host_block_dev *host_dev = find_host_device(dev);
  67. #endif
  68. if (os_lseek(host_dev->fd, start * block_dev->blksz, OS_SEEK_SET) ==
  69. -1) {
  70. printf("ERROR: Invalid block %lx\n", start);
  71. return -1;
  72. }
  73. ssize_t len = os_write(host_dev->fd, buffer, blkcnt * block_dev->blksz);
  74. if (len >= 0)
  75. return len / block_dev->blksz;
  76. return -1;
  77. }
  78. #ifdef CONFIG_BLK
  79. int host_dev_bind(int devnum, char *filename)
  80. {
  81. struct host_block_dev *host_dev;
  82. struct udevice *dev;
  83. char dev_name[20], *str, *fname;
  84. int ret, fd;
  85. /* Remove and unbind the old device, if any */
  86. ret = blk_get_device(IF_TYPE_HOST, devnum, &dev);
  87. if (ret == 0) {
  88. ret = device_remove(dev, DM_REMOVE_NORMAL);
  89. if (ret)
  90. return ret;
  91. ret = device_unbind(dev);
  92. if (ret)
  93. return ret;
  94. } else if (ret != -ENODEV) {
  95. return ret;
  96. }
  97. if (!filename)
  98. return 0;
  99. snprintf(dev_name, sizeof(dev_name), "host%d", devnum);
  100. str = strdup(dev_name);
  101. if (!str)
  102. return -ENOMEM;
  103. fname = strdup(filename);
  104. if (!fname) {
  105. free(str);
  106. return -ENOMEM;
  107. }
  108. fd = os_open(filename, OS_O_RDWR);
  109. if (fd == -1) {
  110. printf("Failed to access host backing file '%s'\n", filename);
  111. ret = -ENOENT;
  112. goto err;
  113. }
  114. ret = blk_create_device(gd->dm_root, "sandbox_host_blk", str,
  115. IF_TYPE_HOST, devnum, 512,
  116. os_lseek(fd, 0, OS_SEEK_END) / 512, &dev);
  117. if (ret)
  118. goto err_file;
  119. host_dev = dev_get_platdata(dev);
  120. host_dev->fd = fd;
  121. host_dev->filename = fname;
  122. ret = device_probe(dev);
  123. if (ret) {
  124. device_unbind(dev);
  125. goto err_file;
  126. }
  127. return 0;
  128. err_file:
  129. os_close(fd);
  130. err:
  131. free(fname);
  132. free(str);
  133. return ret;
  134. }
  135. #else
  136. int host_dev_bind(int dev, char *filename)
  137. {
  138. struct host_block_dev *host_dev = find_host_device(dev);
  139. if (!host_dev)
  140. return -1;
  141. if (host_dev->blk_dev.priv) {
  142. os_close(host_dev->fd);
  143. host_dev->blk_dev.priv = NULL;
  144. }
  145. if (host_dev->filename)
  146. free(host_dev->filename);
  147. if (filename && *filename) {
  148. host_dev->filename = strdup(filename);
  149. } else {
  150. host_dev->filename = NULL;
  151. return 0;
  152. }
  153. host_dev->fd = os_open(host_dev->filename, OS_O_RDWR);
  154. if (host_dev->fd == -1) {
  155. printf("Failed to access host backing file '%s'\n",
  156. host_dev->filename);
  157. return 1;
  158. }
  159. struct blk_desc *blk_dev = &host_dev->blk_dev;
  160. blk_dev->if_type = IF_TYPE_HOST;
  161. blk_dev->priv = host_dev;
  162. blk_dev->blksz = 512;
  163. blk_dev->lba = os_lseek(host_dev->fd, 0, OS_SEEK_END) / blk_dev->blksz;
  164. blk_dev->block_read = host_block_read;
  165. blk_dev->block_write = host_block_write;
  166. blk_dev->devnum = dev;
  167. blk_dev->part_type = PART_TYPE_UNKNOWN;
  168. part_init(blk_dev);
  169. return 0;
  170. }
  171. #endif
  172. int host_get_dev_err(int devnum, struct blk_desc **blk_devp)
  173. {
  174. #ifdef CONFIG_BLK
  175. struct udevice *dev;
  176. int ret;
  177. ret = blk_get_device(IF_TYPE_HOST, devnum, &dev);
  178. if (ret)
  179. return ret;
  180. *blk_devp = dev_get_uclass_platdata(dev);
  181. #else
  182. struct host_block_dev *host_dev = find_host_device(devnum);
  183. if (!host_dev)
  184. return -ENODEV;
  185. if (!host_dev->blk_dev.priv)
  186. return -ENOENT;
  187. *blk_devp = &host_dev->blk_dev;
  188. #endif
  189. return 0;
  190. }
  191. #ifdef CONFIG_BLK
  192. static const struct blk_ops sandbox_host_blk_ops = {
  193. .read = host_block_read,
  194. .write = host_block_write,
  195. };
  196. U_BOOT_DRIVER(sandbox_host_blk) = {
  197. .name = "sandbox_host_blk",
  198. .id = UCLASS_BLK,
  199. .ops = &sandbox_host_blk_ops,
  200. .platdata_auto_alloc_size = sizeof(struct host_block_dev),
  201. };
  202. #else
  203. U_BOOT_LEGACY_BLK(sandbox_host) = {
  204. .if_typename = "host",
  205. .if_type = IF_TYPE_HOST,
  206. .max_devs = CONFIG_HOST_MAX_DEVICES,
  207. .get_dev = host_get_dev_err,
  208. };
  209. #endif