Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * dcssblk.c -- the S/390 block driver for dcss memory |
| 3 | * |
| 4 | * Authors: Carsten Otte, Stefan Weinhuber, Gerald Schaefer |
| 5 | */ |
| 6 | |
Hongjie Yang | 93098bf | 2008-12-25 13:39:45 +0100 | [diff] [blame] | 7 | #define KMSG_COMPONENT "dcssblk" |
| 8 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 9 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/module.h> |
| 11 | #include <linux/moduleparam.h> |
| 12 | #include <linux/ctype.h> |
| 13 | #include <linux/errno.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/blkdev.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/completion.h> |
| 18 | #include <linux/interrupt.h> |
Gerald Schaefer | c369527 | 2009-06-16 10:30:51 +0200 | [diff] [blame] | 19 | #include <linux/platform_device.h> |
| 20 | #include <asm/extmem.h> |
| 21 | #include <asm/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #define DCSSBLK_NAME "dcssblk" |
| 24 | #define DCSSBLK_MINORS_PER_DISK 1 |
| 25 | #define DCSSBLK_PARM_LEN 400 |
Kay Sievers | 98df67b | 2008-12-25 13:38:55 +0100 | [diff] [blame] | 26 | #define DCSS_BUS_ID_SIZE 20 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Al Viro | 46d7432 | 2008-03-02 10:37:41 -0500 | [diff] [blame] | 28 | static int dcssblk_open(struct block_device *bdev, fmode_t mode); |
| 29 | static int dcssblk_release(struct gendisk *disk, fmode_t mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | static int dcssblk_make_request(struct request_queue *q, struct bio *bio); |
Carsten Otte | 420edbc | 2005-06-23 22:05:23 -0700 | [diff] [blame] | 31 | static int dcssblk_direct_access(struct block_device *bdev, sector_t secnum, |
Jared Hulbert | 30afcb4 | 2008-04-28 02:13:02 -0700 | [diff] [blame] | 32 | void **kaddr, unsigned long *pfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | static char dcssblk_segments[DCSSBLK_PARM_LEN] = "\0"; |
| 35 | |
| 36 | static int dcssblk_major; |
| 37 | static struct block_device_operations dcssblk_devops = { |
Carsten Otte | 420edbc | 2005-06-23 22:05:23 -0700 | [diff] [blame] | 38 | .owner = THIS_MODULE, |
Al Viro | 46d7432 | 2008-03-02 10:37:41 -0500 | [diff] [blame] | 39 | .open = dcssblk_open, |
| 40 | .release = dcssblk_release, |
Carsten Otte | 420edbc | 2005-06-23 22:05:23 -0700 | [diff] [blame] | 41 | .direct_access = dcssblk_direct_access, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | }; |
| 43 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | struct dcssblk_dev_info { |
| 45 | struct list_head lh; |
| 46 | struct device dev; |
Kay Sievers | 98df67b | 2008-12-25 13:38:55 +0100 | [diff] [blame] | 47 | char segment_name[DCSS_BUS_ID_SIZE]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | atomic_t use_count; |
| 49 | struct gendisk *gd; |
| 50 | unsigned long start; |
| 51 | unsigned long end; |
| 52 | int segment_type; |
| 53 | unsigned char save_pending; |
| 54 | unsigned char is_shared; |
| 55 | struct request_queue *dcssblk_queue; |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 56 | int num_of_segments; |
| 57 | struct list_head seg_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | }; |
| 59 | |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 60 | struct segment_info { |
| 61 | struct list_head lh; |
Kay Sievers | 98df67b | 2008-12-25 13:38:55 +0100 | [diff] [blame] | 62 | char segment_name[DCSS_BUS_ID_SIZE]; |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 63 | unsigned long start; |
| 64 | unsigned long end; |
| 65 | int segment_type; |
| 66 | }; |
| 67 | |
| 68 | static ssize_t dcssblk_add_store(struct device * dev, struct device_attribute *attr, const char * buf, |
| 69 | size_t count); |
| 70 | static ssize_t dcssblk_remove_store(struct device * dev, struct device_attribute *attr, const char * buf, |
| 71 | size_t count); |
| 72 | static ssize_t dcssblk_save_store(struct device * dev, struct device_attribute *attr, const char * buf, |
| 73 | size_t count); |
| 74 | static ssize_t dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf); |
| 75 | static ssize_t dcssblk_shared_store(struct device * dev, struct device_attribute *attr, const char * buf, |
| 76 | size_t count); |
| 77 | static ssize_t dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf); |
| 78 | static ssize_t dcssblk_seglist_show(struct device *dev, |
| 79 | struct device_attribute *attr, |
| 80 | char *buf); |
| 81 | |
| 82 | static DEVICE_ATTR(add, S_IWUSR, NULL, dcssblk_add_store); |
| 83 | static DEVICE_ATTR(remove, S_IWUSR, NULL, dcssblk_remove_store); |
| 84 | static DEVICE_ATTR(save, S_IWUSR | S_IRUSR, dcssblk_save_show, |
| 85 | dcssblk_save_store); |
| 86 | static DEVICE_ATTR(shared, S_IWUSR | S_IRUSR, dcssblk_shared_show, |
| 87 | dcssblk_shared_store); |
| 88 | static DEVICE_ATTR(seglist, S_IRUSR, dcssblk_seglist_show, NULL); |
| 89 | |
| 90 | static struct device *dcssblk_root_dev; |
| 91 | |
Denis Cheng | c11ca97 | 2008-01-26 14:11:13 +0100 | [diff] [blame] | 92 | static LIST_HEAD(dcssblk_devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | static struct rw_semaphore dcssblk_devices_sem; |
| 94 | |
| 95 | /* |
| 96 | * release function for segment device. |
| 97 | */ |
| 98 | static void |
| 99 | dcssblk_release_segment(struct device *dev) |
| 100 | { |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 101 | struct dcssblk_dev_info *dev_info; |
| 102 | struct segment_info *entry, *temp; |
| 103 | |
| 104 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); |
| 105 | list_for_each_entry_safe(entry, temp, &dev_info->seg_list, lh) { |
| 106 | list_del(&entry->lh); |
| 107 | kfree(entry); |
| 108 | } |
| 109 | kfree(dev_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | module_put(THIS_MODULE); |
| 111 | } |
| 112 | |
| 113 | /* |
| 114 | * get a minor number. needs to be called with |
| 115 | * down_write(&dcssblk_devices_sem) and the |
| 116 | * device needs to be enqueued before the semaphore is |
| 117 | * freed. |
| 118 | */ |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 119 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | dcssblk_assign_free_minor(struct dcssblk_dev_info *dev_info) |
| 121 | { |
| 122 | int minor, found; |
| 123 | struct dcssblk_dev_info *entry; |
| 124 | |
| 125 | if (dev_info == NULL) |
| 126 | return -EINVAL; |
| 127 | for (minor = 0; minor < (1<<MINORBITS); minor++) { |
| 128 | found = 0; |
| 129 | // test if minor available |
| 130 | list_for_each_entry(entry, &dcssblk_devices, lh) |
Gerald Schaefer | d059148 | 2009-06-12 10:26:35 +0200 | [diff] [blame] | 131 | if (minor == entry->gd->first_minor) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | found++; |
| 133 | if (!found) break; // got unused minor |
| 134 | } |
| 135 | if (found) |
| 136 | return -EBUSY; |
| 137 | dev_info->gd->first_minor = minor; |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | /* |
| 142 | * get the struct dcssblk_dev_info from dcssblk_devices |
| 143 | * for the given name. |
| 144 | * down_read(&dcssblk_devices_sem) must be held. |
| 145 | */ |
| 146 | static struct dcssblk_dev_info * |
| 147 | dcssblk_get_device_by_name(char *name) |
| 148 | { |
| 149 | struct dcssblk_dev_info *entry; |
| 150 | |
| 151 | list_for_each_entry(entry, &dcssblk_devices, lh) { |
| 152 | if (!strcmp(name, entry->segment_name)) { |
| 153 | return entry; |
| 154 | } |
| 155 | } |
| 156 | return NULL; |
| 157 | } |
| 158 | |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 159 | /* |
| 160 | * get the struct segment_info from seg_list |
| 161 | * for the given name. |
| 162 | * down_read(&dcssblk_devices_sem) must be held. |
| 163 | */ |
| 164 | static struct segment_info * |
| 165 | dcssblk_get_segment_by_name(char *name) |
| 166 | { |
| 167 | struct dcssblk_dev_info *dev_info; |
| 168 | struct segment_info *entry; |
| 169 | |
| 170 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { |
| 171 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
| 172 | if (!strcmp(name, entry->segment_name)) |
| 173 | return entry; |
| 174 | } |
| 175 | } |
| 176 | return NULL; |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * get the highest address of the multi-segment block. |
| 181 | */ |
| 182 | static unsigned long |
| 183 | dcssblk_find_highest_addr(struct dcssblk_dev_info *dev_info) |
| 184 | { |
| 185 | unsigned long highest_addr; |
| 186 | struct segment_info *entry; |
| 187 | |
| 188 | highest_addr = 0; |
| 189 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
| 190 | if (highest_addr < entry->end) |
| 191 | highest_addr = entry->end; |
| 192 | } |
| 193 | return highest_addr; |
| 194 | } |
| 195 | |
| 196 | /* |
| 197 | * get the lowest address of the multi-segment block. |
| 198 | */ |
| 199 | static unsigned long |
| 200 | dcssblk_find_lowest_addr(struct dcssblk_dev_info *dev_info) |
| 201 | { |
| 202 | int set_first; |
| 203 | unsigned long lowest_addr; |
| 204 | struct segment_info *entry; |
| 205 | |
| 206 | set_first = 0; |
| 207 | lowest_addr = 0; |
| 208 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
| 209 | if (set_first == 0) { |
| 210 | lowest_addr = entry->start; |
| 211 | set_first = 1; |
| 212 | } else { |
| 213 | if (lowest_addr > entry->start) |
| 214 | lowest_addr = entry->start; |
| 215 | } |
| 216 | } |
| 217 | return lowest_addr; |
| 218 | } |
| 219 | |
| 220 | /* |
| 221 | * Check continuity of segments. |
| 222 | */ |
| 223 | static int |
| 224 | dcssblk_is_continuous(struct dcssblk_dev_info *dev_info) |
| 225 | { |
| 226 | int i, j, rc; |
| 227 | struct segment_info *sort_list, *entry, temp; |
| 228 | |
| 229 | if (dev_info->num_of_segments <= 1) |
| 230 | return 0; |
| 231 | |
| 232 | sort_list = kzalloc( |
| 233 | sizeof(struct segment_info) * dev_info->num_of_segments, |
| 234 | GFP_KERNEL); |
| 235 | if (sort_list == NULL) |
| 236 | return -ENOMEM; |
| 237 | i = 0; |
| 238 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
| 239 | memcpy(&sort_list[i], entry, sizeof(struct segment_info)); |
| 240 | i++; |
| 241 | } |
| 242 | |
| 243 | /* sort segments */ |
| 244 | for (i = 0; i < dev_info->num_of_segments; i++) |
| 245 | for (j = 0; j < dev_info->num_of_segments; j++) |
| 246 | if (sort_list[j].start > sort_list[i].start) { |
| 247 | memcpy(&temp, &sort_list[i], |
| 248 | sizeof(struct segment_info)); |
| 249 | memcpy(&sort_list[i], &sort_list[j], |
| 250 | sizeof(struct segment_info)); |
| 251 | memcpy(&sort_list[j], &temp, |
| 252 | sizeof(struct segment_info)); |
| 253 | } |
| 254 | |
| 255 | /* check continuity */ |
| 256 | for (i = 0; i < dev_info->num_of_segments - 1; i++) { |
| 257 | if ((sort_list[i].end + 1) != sort_list[i+1].start) { |
Hongjie Yang | 93098bf | 2008-12-25 13:39:45 +0100 | [diff] [blame] | 258 | pr_err("Adjacent DCSSs %s and %s are not " |
| 259 | "contiguous\n", sort_list[i].segment_name, |
| 260 | sort_list[i+1].segment_name); |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 261 | rc = -EINVAL; |
| 262 | goto out; |
| 263 | } |
| 264 | /* EN and EW are allowed in a block device */ |
| 265 | if (sort_list[i].segment_type != sort_list[i+1].segment_type) { |
| 266 | if (!(sort_list[i].segment_type & SEGMENT_EXCLUSIVE) || |
| 267 | (sort_list[i].segment_type == SEG_TYPE_ER) || |
| 268 | !(sort_list[i+1].segment_type & |
| 269 | SEGMENT_EXCLUSIVE) || |
| 270 | (sort_list[i+1].segment_type == SEG_TYPE_ER)) { |
Hongjie Yang | 93098bf | 2008-12-25 13:39:45 +0100 | [diff] [blame] | 271 | pr_err("DCSS %s and DCSS %s have " |
| 272 | "incompatible types\n", |
| 273 | sort_list[i].segment_name, |
| 274 | sort_list[i+1].segment_name); |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 275 | rc = -EINVAL; |
| 276 | goto out; |
| 277 | } |
| 278 | } |
| 279 | } |
| 280 | rc = 0; |
| 281 | out: |
| 282 | kfree(sort_list); |
| 283 | return rc; |
| 284 | } |
| 285 | |
| 286 | /* |
| 287 | * Load a segment |
| 288 | */ |
| 289 | static int |
| 290 | dcssblk_load_segment(char *name, struct segment_info **seg_info) |
| 291 | { |
| 292 | int rc; |
| 293 | |
| 294 | /* already loaded? */ |
| 295 | down_read(&dcssblk_devices_sem); |
| 296 | *seg_info = dcssblk_get_segment_by_name(name); |
| 297 | up_read(&dcssblk_devices_sem); |
| 298 | if (*seg_info != NULL) |
| 299 | return -EEXIST; |
| 300 | |
| 301 | /* get a struct segment_info */ |
| 302 | *seg_info = kzalloc(sizeof(struct segment_info), GFP_KERNEL); |
| 303 | if (*seg_info == NULL) |
| 304 | return -ENOMEM; |
| 305 | |
| 306 | strcpy((*seg_info)->segment_name, name); |
| 307 | |
| 308 | /* load the segment */ |
| 309 | rc = segment_load(name, SEGMENT_SHARED, |
| 310 | &(*seg_info)->start, &(*seg_info)->end); |
| 311 | if (rc < 0) { |
| 312 | segment_warning(rc, (*seg_info)->segment_name); |
| 313 | kfree(*seg_info); |
| 314 | } else { |
| 315 | INIT_LIST_HEAD(&(*seg_info)->lh); |
| 316 | (*seg_info)->segment_type = rc; |
| 317 | } |
| 318 | return rc; |
| 319 | } |
| 320 | |
Gerald Schaefer | 931bb68 | 2007-11-05 11:10:09 +0100 | [diff] [blame] | 321 | static void dcssblk_unregister_callback(struct device *dev) |
| 322 | { |
| 323 | device_unregister(dev); |
| 324 | put_device(dev); |
| 325 | } |
| 326 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | /* |
| 328 | * device attribute for switching shared/nonshared (exclusive) |
| 329 | * operation (show + store) |
| 330 | */ |
| 331 | static ssize_t |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 332 | dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | { |
| 334 | struct dcssblk_dev_info *dev_info; |
| 335 | |
| 336 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); |
| 337 | return sprintf(buf, dev_info->is_shared ? "1\n" : "0\n"); |
| 338 | } |
| 339 | |
| 340 | static ssize_t |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 341 | dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | { |
| 343 | struct dcssblk_dev_info *dev_info; |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 344 | struct segment_info *entry, *temp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | int rc; |
| 346 | |
Hongjie Yang | ded77fb | 2008-07-14 09:59:39 +0200 | [diff] [blame] | 347 | if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | down_write(&dcssblk_devices_sem); |
| 350 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); |
| 351 | if (atomic_read(&dev_info->use_count)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | rc = -EBUSY; |
| 353 | goto out; |
| 354 | } |
| 355 | if (inbuf[0] == '1') { |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 356 | /* reload segments in shared mode */ |
| 357 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
| 358 | rc = segment_modify_shared(entry->segment_name, |
| 359 | SEGMENT_SHARED); |
| 360 | if (rc < 0) { |
| 361 | BUG_ON(rc == -EINVAL); |
| 362 | if (rc != -EAGAIN) |
| 363 | goto removeseg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | } |
| 365 | } |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 366 | dev_info->is_shared = 1; |
| 367 | switch (dev_info->segment_type) { |
| 368 | case SEG_TYPE_SR: |
| 369 | case SEG_TYPE_ER: |
| 370 | case SEG_TYPE_SC: |
| 371 | set_disk_ro(dev_info->gd, 1); |
| 372 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | } else if (inbuf[0] == '0') { |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 374 | /* reload segments in exclusive mode */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | if (dev_info->segment_type == SEG_TYPE_SC) { |
Hongjie Yang | 93098bf | 2008-12-25 13:39:45 +0100 | [diff] [blame] | 376 | pr_err("DCSS %s is of type SC and cannot be " |
| 377 | "loaded as exclusive-writable\n", |
| 378 | dev_info->segment_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | rc = -EINVAL; |
| 380 | goto out; |
| 381 | } |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 382 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
| 383 | rc = segment_modify_shared(entry->segment_name, |
| 384 | SEGMENT_EXCLUSIVE); |
| 385 | if (rc < 0) { |
| 386 | BUG_ON(rc == -EINVAL); |
| 387 | if (rc != -EAGAIN) |
| 388 | goto removeseg; |
| 389 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | } |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 391 | dev_info->is_shared = 0; |
| 392 | set_disk_ro(dev_info->gd, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | rc = -EINVAL; |
| 395 | goto out; |
| 396 | } |
| 397 | rc = count; |
| 398 | goto out; |
| 399 | |
| 400 | removeseg: |
Hongjie Yang | 93098bf | 2008-12-25 13:39:45 +0100 | [diff] [blame] | 401 | pr_err("DCSS device %s is removed after a failed access mode " |
| 402 | "change\n", dev_info->segment_name); |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 403 | temp = entry; |
| 404 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
| 405 | if (entry != temp) |
| 406 | segment_unload(entry->segment_name); |
| 407 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | list_del(&dev_info->lh); |
| 409 | |
| 410 | del_gendisk(dev_info->gd); |
Al Viro | 1312f40 | 2006-03-12 11:02:03 -0500 | [diff] [blame] | 411 | blk_cleanup_queue(dev_info->dcssblk_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | dev_info->gd->queue = NULL; |
| 413 | put_disk(dev_info->gd); |
Gerald Schaefer | 931bb68 | 2007-11-05 11:10:09 +0100 | [diff] [blame] | 414 | rc = device_schedule_callback(dev, dcssblk_unregister_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | out: |
| 416 | up_write(&dcssblk_devices_sem); |
| 417 | return rc; |
| 418 | } |
| 419 | |
| 420 | /* |
| 421 | * device attribute for save operation on current copy |
| 422 | * of the segment. If the segment is busy, saving will |
| 423 | * become pending until it gets released, which can be |
| 424 | * undone by storing a non-true value to this entry. |
| 425 | * (show + store) |
| 426 | */ |
| 427 | static ssize_t |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 428 | dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | { |
| 430 | struct dcssblk_dev_info *dev_info; |
| 431 | |
| 432 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); |
| 433 | return sprintf(buf, dev_info->save_pending ? "1\n" : "0\n"); |
| 434 | } |
| 435 | |
| 436 | static ssize_t |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 437 | dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | { |
| 439 | struct dcssblk_dev_info *dev_info; |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 440 | struct segment_info *entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | |
Hongjie Yang | ded77fb | 2008-07-14 09:59:39 +0200 | [diff] [blame] | 442 | if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); |
| 445 | |
| 446 | down_write(&dcssblk_devices_sem); |
| 447 | if (inbuf[0] == '1') { |
| 448 | if (atomic_read(&dev_info->use_count) == 0) { |
| 449 | // device is idle => we save immediately |
Hongjie Yang | 93098bf | 2008-12-25 13:39:45 +0100 | [diff] [blame] | 450 | pr_info("All DCSSs that map to device %s are " |
| 451 | "saved\n", dev_info->segment_name); |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 452 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
| 453 | segment_save(entry->segment_name); |
| 454 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | } else { |
| 456 | // device is busy => we save it when it becomes |
| 457 | // idle in dcssblk_release |
Hongjie Yang | 93098bf | 2008-12-25 13:39:45 +0100 | [diff] [blame] | 458 | pr_info("Device %s is in use, its DCSSs will be " |
| 459 | "saved when it becomes idle\n", |
| 460 | dev_info->segment_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | dev_info->save_pending = 1; |
| 462 | } |
| 463 | } else if (inbuf[0] == '0') { |
| 464 | if (dev_info->save_pending) { |
| 465 | // device is busy & the user wants to undo his save |
| 466 | // request |
| 467 | dev_info->save_pending = 0; |
Hongjie Yang | 93098bf | 2008-12-25 13:39:45 +0100 | [diff] [blame] | 468 | pr_info("A pending save request for device %s " |
| 469 | "has been canceled\n", |
| 470 | dev_info->segment_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | } |
| 472 | } else { |
| 473 | up_write(&dcssblk_devices_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | return -EINVAL; |
| 475 | } |
| 476 | up_write(&dcssblk_devices_sem); |
| 477 | return count; |
| 478 | } |
| 479 | |
| 480 | /* |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 481 | * device attribute for showing all segments in a device |
| 482 | */ |
| 483 | static ssize_t |
| 484 | dcssblk_seglist_show(struct device *dev, struct device_attribute *attr, |
| 485 | char *buf) |
| 486 | { |
| 487 | int i; |
| 488 | |
| 489 | struct dcssblk_dev_info *dev_info; |
| 490 | struct segment_info *entry; |
| 491 | |
| 492 | down_read(&dcssblk_devices_sem); |
| 493 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); |
| 494 | i = 0; |
| 495 | buf[0] = '\0'; |
| 496 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
| 497 | strcpy(&buf[i], entry->segment_name); |
| 498 | i += strlen(entry->segment_name); |
| 499 | buf[i] = '\n'; |
| 500 | i++; |
| 501 | } |
| 502 | up_read(&dcssblk_devices_sem); |
| 503 | return i; |
| 504 | } |
| 505 | |
| 506 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | * device attribute for adding devices |
| 508 | */ |
| 509 | static ssize_t |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 510 | dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | { |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 512 | int rc, i, j, num_of_segments; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | struct dcssblk_dev_info *dev_info; |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 514 | struct segment_info *seg_info, *temp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | char *local_buf; |
| 516 | unsigned long seg_byte_size; |
| 517 | |
| 518 | dev_info = NULL; |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 519 | seg_info = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | if (dev != dcssblk_root_dev) { |
| 521 | rc = -EINVAL; |
| 522 | goto out_nobuf; |
| 523 | } |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 524 | if ((count < 1) || (buf[0] == '\0') || (buf[0] == '\n')) { |
| 525 | rc = -ENAMETOOLONG; |
| 526 | goto out_nobuf; |
| 527 | } |
| 528 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | local_buf = kmalloc(count + 1, GFP_KERNEL); |
| 530 | if (local_buf == NULL) { |
| 531 | rc = -ENOMEM; |
| 532 | goto out_nobuf; |
| 533 | } |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 534 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | /* |
| 536 | * parse input |
| 537 | */ |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 538 | num_of_segments = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | for (i = 0; ((buf[i] != '\0') && (buf[i] != '\n') && i < count); i++) { |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 540 | for (j = i; (buf[j] != ':') && |
| 541 | (buf[j] != '\0') && |
| 542 | (buf[j] != '\n') && |
| 543 | j < count; j++) { |
| 544 | local_buf[j-i] = toupper(buf[j]); |
| 545 | } |
| 546 | local_buf[j-i] = '\0'; |
| 547 | if (((j - i) == 0) || ((j - i) > 8)) { |
| 548 | rc = -ENAMETOOLONG; |
| 549 | goto seg_list_del; |
| 550 | } |
| 551 | |
| 552 | rc = dcssblk_load_segment(local_buf, &seg_info); |
| 553 | if (rc < 0) |
| 554 | goto seg_list_del; |
| 555 | /* |
| 556 | * get a struct dcssblk_dev_info |
| 557 | */ |
| 558 | if (num_of_segments == 0) { |
| 559 | dev_info = kzalloc(sizeof(struct dcssblk_dev_info), |
| 560 | GFP_KERNEL); |
| 561 | if (dev_info == NULL) { |
| 562 | rc = -ENOMEM; |
| 563 | goto out; |
| 564 | } |
| 565 | strcpy(dev_info->segment_name, local_buf); |
| 566 | dev_info->segment_type = seg_info->segment_type; |
| 567 | INIT_LIST_HEAD(&dev_info->seg_list); |
| 568 | } |
| 569 | list_add_tail(&seg_info->lh, &dev_info->seg_list); |
| 570 | num_of_segments++; |
| 571 | i = j; |
| 572 | |
| 573 | if ((buf[j] == '\0') || (buf[j] == '\n')) |
| 574 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 577 | /* no trailing colon at the end of the input */ |
| 578 | if ((i > 0) && (buf[i-1] == ':')) { |
| 579 | rc = -ENAMETOOLONG; |
| 580 | goto seg_list_del; |
| 581 | } |
| 582 | strlcpy(local_buf, buf, i + 1); |
| 583 | dev_info->num_of_segments = num_of_segments; |
| 584 | rc = dcssblk_is_continuous(dev_info); |
| 585 | if (rc < 0) |
| 586 | goto seg_list_del; |
| 587 | |
| 588 | dev_info->start = dcssblk_find_lowest_addr(dev_info); |
| 589 | dev_info->end = dcssblk_find_highest_addr(dev_info); |
| 590 | |
| 591 | dev_set_name(&dev_info->dev, dev_info->segment_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | dev_info->dev.release = dcssblk_release_segment; |
| 593 | INIT_LIST_HEAD(&dev_info->lh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | dev_info->gd = alloc_disk(DCSSBLK_MINORS_PER_DISK); |
| 595 | if (dev_info->gd == NULL) { |
| 596 | rc = -ENOMEM; |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 597 | goto seg_list_del; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | } |
| 599 | dev_info->gd->major = dcssblk_major; |
| 600 | dev_info->gd->fops = &dcssblk_devops; |
| 601 | dev_info->dcssblk_queue = blk_alloc_queue(GFP_KERNEL); |
| 602 | dev_info->gd->queue = dev_info->dcssblk_queue; |
| 603 | dev_info->gd->private_data = dev_info; |
| 604 | dev_info->gd->driverfs_dev = &dev_info->dev; |
Heiko Carstens | c5411db | 2008-02-05 16:50:50 +0100 | [diff] [blame] | 605 | blk_queue_make_request(dev_info->dcssblk_queue, dcssblk_make_request); |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 606 | blk_queue_logical_block_size(dev_info->dcssblk_queue, 4096); |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 607 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | seg_byte_size = (dev_info->end - dev_info->start + 1); |
| 609 | set_capacity(dev_info->gd, seg_byte_size >> 9); // size in sectors |
Hongjie Yang | 93098bf | 2008-12-25 13:39:45 +0100 | [diff] [blame] | 610 | pr_info("Loaded %s with total size %lu bytes and capacity %lu " |
| 611 | "sectors\n", local_buf, seg_byte_size, seg_byte_size >> 9); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | dev_info->save_pending = 0; |
| 614 | dev_info->is_shared = 1; |
| 615 | dev_info->dev.parent = dcssblk_root_dev; |
| 616 | |
| 617 | /* |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 618 | *get minor, add to list |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | */ |
| 620 | down_write(&dcssblk_devices_sem); |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 621 | if (dcssblk_get_segment_by_name(local_buf)) { |
Gerald Schaefer | 04f64b5 | 2008-08-21 19:46:40 +0200 | [diff] [blame] | 622 | rc = -EEXIST; |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 623 | goto release_gd; |
Gerald Schaefer | 04f64b5 | 2008-08-21 19:46:40 +0200 | [diff] [blame] | 624 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | rc = dcssblk_assign_free_minor(dev_info); |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 626 | if (rc) |
| 627 | goto release_gd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | sprintf(dev_info->gd->disk_name, "dcssblk%d", |
Gerald Schaefer | d059148 | 2009-06-12 10:26:35 +0200 | [diff] [blame] | 629 | dev_info->gd->first_minor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | list_add_tail(&dev_info->lh, &dcssblk_devices); |
| 631 | |
| 632 | if (!try_module_get(THIS_MODULE)) { |
| 633 | rc = -ENODEV; |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 634 | goto dev_list_del; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | } |
| 636 | /* |
| 637 | * register the device |
| 638 | */ |
| 639 | rc = device_register(&dev_info->dev); |
| 640 | if (rc) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | module_put(THIS_MODULE); |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 642 | goto dev_list_del; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | } |
| 644 | get_device(&dev_info->dev); |
| 645 | rc = device_create_file(&dev_info->dev, &dev_attr_shared); |
| 646 | if (rc) |
| 647 | goto unregister_dev; |
| 648 | rc = device_create_file(&dev_info->dev, &dev_attr_save); |
| 649 | if (rc) |
| 650 | goto unregister_dev; |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 651 | rc = device_create_file(&dev_info->dev, &dev_attr_seglist); |
| 652 | if (rc) |
| 653 | goto unregister_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | |
Christian Borntraeger | 436d1bc | 2007-12-04 16:09:03 +0100 | [diff] [blame] | 655 | add_disk(dev_info->gd); |
| 656 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | switch (dev_info->segment_type) { |
| 658 | case SEG_TYPE_SR: |
| 659 | case SEG_TYPE_ER: |
| 660 | case SEG_TYPE_SC: |
| 661 | set_disk_ro(dev_info->gd,1); |
| 662 | break; |
| 663 | default: |
| 664 | set_disk_ro(dev_info->gd,0); |
| 665 | break; |
| 666 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | up_write(&dcssblk_devices_sem); |
| 668 | rc = count; |
| 669 | goto out; |
| 670 | |
| 671 | unregister_dev: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | list_del(&dev_info->lh); |
Al Viro | 1312f40 | 2006-03-12 11:02:03 -0500 | [diff] [blame] | 673 | blk_cleanup_queue(dev_info->dcssblk_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | dev_info->gd->queue = NULL; |
| 675 | put_disk(dev_info->gd); |
| 676 | device_unregister(&dev_info->dev); |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 677 | list_for_each_entry(seg_info, &dev_info->seg_list, lh) { |
| 678 | segment_unload(seg_info->segment_name); |
| 679 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | put_device(&dev_info->dev); |
| 681 | up_write(&dcssblk_devices_sem); |
| 682 | goto out; |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 683 | dev_list_del: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | list_del(&dev_info->lh); |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 685 | release_gd: |
Al Viro | 1312f40 | 2006-03-12 11:02:03 -0500 | [diff] [blame] | 686 | blk_cleanup_queue(dev_info->dcssblk_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | dev_info->gd->queue = NULL; |
| 688 | put_disk(dev_info->gd); |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 689 | up_write(&dcssblk_devices_sem); |
| 690 | seg_list_del: |
| 691 | if (dev_info == NULL) |
| 692 | goto out; |
| 693 | list_for_each_entry_safe(seg_info, temp, &dev_info->seg_list, lh) { |
| 694 | list_del(&seg_info->lh); |
| 695 | segment_unload(seg_info->segment_name); |
| 696 | kfree(seg_info); |
| 697 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | kfree(dev_info); |
| 699 | out: |
| 700 | kfree(local_buf); |
| 701 | out_nobuf: |
| 702 | return rc; |
| 703 | } |
| 704 | |
| 705 | /* |
| 706 | * device attribute for removing devices |
| 707 | */ |
| 708 | static ssize_t |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 709 | dcssblk_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | { |
| 711 | struct dcssblk_dev_info *dev_info; |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 712 | struct segment_info *entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | int rc, i; |
| 714 | char *local_buf; |
| 715 | |
| 716 | if (dev != dcssblk_root_dev) { |
| 717 | return -EINVAL; |
| 718 | } |
| 719 | local_buf = kmalloc(count + 1, GFP_KERNEL); |
| 720 | if (local_buf == NULL) { |
| 721 | return -ENOMEM; |
| 722 | } |
| 723 | /* |
| 724 | * parse input |
| 725 | */ |
| 726 | for (i = 0; ((*(buf+i)!='\0') && (*(buf+i)!='\n') && i < count); i++) { |
| 727 | local_buf[i] = toupper(buf[i]); |
| 728 | } |
| 729 | local_buf[i] = '\0'; |
| 730 | if ((i == 0) || (i > 8)) { |
| 731 | rc = -ENAMETOOLONG; |
| 732 | goto out_buf; |
| 733 | } |
| 734 | |
| 735 | down_write(&dcssblk_devices_sem); |
| 736 | dev_info = dcssblk_get_device_by_name(local_buf); |
| 737 | if (dev_info == NULL) { |
| 738 | up_write(&dcssblk_devices_sem); |
Hongjie Yang | 93098bf | 2008-12-25 13:39:45 +0100 | [diff] [blame] | 739 | pr_warning("Device %s cannot be removed because it is not a " |
| 740 | "known device\n", local_buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | rc = -ENODEV; |
| 742 | goto out_buf; |
| 743 | } |
| 744 | if (atomic_read(&dev_info->use_count) != 0) { |
| 745 | up_write(&dcssblk_devices_sem); |
Hongjie Yang | 93098bf | 2008-12-25 13:39:45 +0100 | [diff] [blame] | 746 | pr_warning("Device %s cannot be removed while it is in " |
| 747 | "use\n", local_buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | rc = -EBUSY; |
| 749 | goto out_buf; |
| 750 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 752 | list_del(&dev_info->lh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | del_gendisk(dev_info->gd); |
Al Viro | 1312f40 | 2006-03-12 11:02:03 -0500 | [diff] [blame] | 754 | blk_cleanup_queue(dev_info->dcssblk_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | dev_info->gd->queue = NULL; |
| 756 | put_disk(dev_info->gd); |
| 757 | device_unregister(&dev_info->dev); |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 758 | |
| 759 | /* unload all related segments */ |
| 760 | list_for_each_entry(entry, &dev_info->seg_list, lh) |
| 761 | segment_unload(entry->segment_name); |
| 762 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | put_device(&dev_info->dev); |
| 764 | up_write(&dcssblk_devices_sem); |
| 765 | |
| 766 | rc = count; |
| 767 | out_buf: |
| 768 | kfree(local_buf); |
| 769 | return rc; |
| 770 | } |
| 771 | |
| 772 | static int |
Al Viro | 46d7432 | 2008-03-02 10:37:41 -0500 | [diff] [blame] | 773 | dcssblk_open(struct block_device *bdev, fmode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | { |
| 775 | struct dcssblk_dev_info *dev_info; |
| 776 | int rc; |
| 777 | |
Al Viro | 46d7432 | 2008-03-02 10:37:41 -0500 | [diff] [blame] | 778 | dev_info = bdev->bd_disk->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | if (NULL == dev_info) { |
| 780 | rc = -ENODEV; |
| 781 | goto out; |
| 782 | } |
| 783 | atomic_inc(&dev_info->use_count); |
Al Viro | 46d7432 | 2008-03-02 10:37:41 -0500 | [diff] [blame] | 784 | bdev->bd_block_size = 4096; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | rc = 0; |
| 786 | out: |
| 787 | return rc; |
| 788 | } |
| 789 | |
| 790 | static int |
Al Viro | 46d7432 | 2008-03-02 10:37:41 -0500 | [diff] [blame] | 791 | dcssblk_release(struct gendisk *disk, fmode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | { |
Al Viro | 46d7432 | 2008-03-02 10:37:41 -0500 | [diff] [blame] | 793 | struct dcssblk_dev_info *dev_info = disk->private_data; |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 794 | struct segment_info *entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | int rc; |
| 796 | |
Al Viro | 46d7432 | 2008-03-02 10:37:41 -0500 | [diff] [blame] | 797 | if (!dev_info) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | rc = -ENODEV; |
| 799 | goto out; |
| 800 | } |
| 801 | down_write(&dcssblk_devices_sem); |
| 802 | if (atomic_dec_and_test(&dev_info->use_count) |
| 803 | && (dev_info->save_pending)) { |
Hongjie Yang | 93098bf | 2008-12-25 13:39:45 +0100 | [diff] [blame] | 804 | pr_info("Device %s has become idle and is being saved " |
| 805 | "now\n", dev_info->segment_name); |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 806 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
| 807 | segment_save(entry->segment_name); |
| 808 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | dev_info->save_pending = 0; |
| 810 | } |
| 811 | up_write(&dcssblk_devices_sem); |
| 812 | rc = 0; |
| 813 | out: |
| 814 | return rc; |
| 815 | } |
| 816 | |
| 817 | static int |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 818 | dcssblk_make_request(struct request_queue *q, struct bio *bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | { |
| 820 | struct dcssblk_dev_info *dev_info; |
| 821 | struct bio_vec *bvec; |
| 822 | unsigned long index; |
| 823 | unsigned long page_addr; |
| 824 | unsigned long source_addr; |
| 825 | unsigned long bytes_done; |
| 826 | int i; |
| 827 | |
| 828 | bytes_done = 0; |
| 829 | dev_info = bio->bi_bdev->bd_disk->private_data; |
| 830 | if (dev_info == NULL) |
| 831 | goto fail; |
| 832 | if ((bio->bi_sector & 7) != 0 || (bio->bi_size & 4095) != 0) |
| 833 | /* Request is not page-aligned. */ |
| 834 | goto fail; |
| 835 | if (((bio->bi_size >> 9) + bio->bi_sector) |
| 836 | > get_capacity(bio->bi_bdev->bd_disk)) { |
| 837 | /* Request beyond end of DCSS segment. */ |
| 838 | goto fail; |
| 839 | } |
Carsten Otte | 420edbc | 2005-06-23 22:05:23 -0700 | [diff] [blame] | 840 | /* verify data transfer direction */ |
| 841 | if (dev_info->is_shared) { |
| 842 | switch (dev_info->segment_type) { |
| 843 | case SEG_TYPE_SR: |
| 844 | case SEG_TYPE_ER: |
| 845 | case SEG_TYPE_SC: |
| 846 | /* cannot write to these segments */ |
| 847 | if (bio_data_dir(bio) == WRITE) { |
Hongjie Yang | 93098bf | 2008-12-25 13:39:45 +0100 | [diff] [blame] | 848 | pr_warning("Writing to %s failed because it " |
| 849 | "is a read-only device\n", |
Kay Sievers | 2a0217d | 2008-10-10 21:33:09 +0200 | [diff] [blame] | 850 | dev_name(&dev_info->dev)); |
Carsten Otte | 420edbc | 2005-06-23 22:05:23 -0700 | [diff] [blame] | 851 | goto fail; |
| 852 | } |
| 853 | } |
| 854 | } |
| 855 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | index = (bio->bi_sector >> 3); |
| 857 | bio_for_each_segment(bvec, bio, i) { |
| 858 | page_addr = (unsigned long) |
| 859 | page_address(bvec->bv_page) + bvec->bv_offset; |
| 860 | source_addr = dev_info->start + (index<<12) + bytes_done; |
Roel Kluin | 39f73b2 | 2008-02-19 15:29:33 +0100 | [diff] [blame] | 861 | if (unlikely((page_addr & 4095) != 0) || (bvec->bv_len & 4095) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | // More paranoia. |
| 863 | goto fail; |
| 864 | if (bio_data_dir(bio) == READ) { |
| 865 | memcpy((void*)page_addr, (void*)source_addr, |
| 866 | bvec->bv_len); |
| 867 | } else { |
| 868 | memcpy((void*)source_addr, (void*)page_addr, |
| 869 | bvec->bv_len); |
| 870 | } |
| 871 | bytes_done += bvec->bv_len; |
| 872 | } |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 873 | bio_endio(bio, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | return 0; |
| 875 | fail: |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 876 | bio_io_error(bio); |
Carsten Otte | 420edbc | 2005-06-23 22:05:23 -0700 | [diff] [blame] | 877 | return 0; |
| 878 | } |
| 879 | |
| 880 | static int |
| 881 | dcssblk_direct_access (struct block_device *bdev, sector_t secnum, |
Jared Hulbert | 30afcb4 | 2008-04-28 02:13:02 -0700 | [diff] [blame] | 882 | void **kaddr, unsigned long *pfn) |
Carsten Otte | 420edbc | 2005-06-23 22:05:23 -0700 | [diff] [blame] | 883 | { |
| 884 | struct dcssblk_dev_info *dev_info; |
| 885 | unsigned long pgoff; |
| 886 | |
| 887 | dev_info = bdev->bd_disk->private_data; |
| 888 | if (!dev_info) |
| 889 | return -ENODEV; |
| 890 | if (secnum % (PAGE_SIZE/512)) |
| 891 | return -EINVAL; |
| 892 | pgoff = secnum / (PAGE_SIZE / 512); |
| 893 | if ((pgoff+1)*PAGE_SIZE-1 > dev_info->end - dev_info->start) |
| 894 | return -ERANGE; |
Jared Hulbert | 30afcb4 | 2008-04-28 02:13:02 -0700 | [diff] [blame] | 895 | *kaddr = (void *) (dev_info->start+pgoff*PAGE_SIZE); |
| 896 | *pfn = virt_to_phys(*kaddr) >> PAGE_SHIFT; |
| 897 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | return 0; |
| 899 | } |
| 900 | |
| 901 | static void |
| 902 | dcssblk_check_params(void) |
| 903 | { |
| 904 | int rc, i, j, k; |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 905 | char buf[DCSSBLK_PARM_LEN + 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | struct dcssblk_dev_info *dev_info; |
| 907 | |
| 908 | for (i = 0; (i < DCSSBLK_PARM_LEN) && (dcssblk_segments[i] != '\0'); |
| 909 | i++) { |
| 910 | for (j = i; (dcssblk_segments[j] != ',') && |
| 911 | (dcssblk_segments[j] != '\0') && |
| 912 | (dcssblk_segments[j] != '(') && |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 913 | (j < DCSSBLK_PARM_LEN); j++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | { |
| 915 | buf[j-i] = dcssblk_segments[j]; |
| 916 | } |
| 917 | buf[j-i] = '\0'; |
Cornelia Huck | f901e5d | 2005-06-25 14:55:29 -0700 | [diff] [blame] | 918 | rc = dcssblk_add_store(dcssblk_root_dev, NULL, buf, j-i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | if ((rc >= 0) && (dcssblk_segments[j] == '(')) { |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 920 | for (k = 0; (buf[k] != ':') && (buf[k] != '\0'); k++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | buf[k] = toupper(buf[k]); |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 922 | buf[k] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | if (!strncmp(&dcssblk_segments[j], "(local)", 7)) { |
| 924 | down_read(&dcssblk_devices_sem); |
| 925 | dev_info = dcssblk_get_device_by_name(buf); |
| 926 | up_read(&dcssblk_devices_sem); |
| 927 | if (dev_info) |
| 928 | dcssblk_shared_store(&dev_info->dev, |
Cornelia Huck | f901e5d | 2005-06-25 14:55:29 -0700 | [diff] [blame] | 929 | NULL, "0\n", 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | } |
| 931 | } |
| 932 | while ((dcssblk_segments[j] != ',') && |
| 933 | (dcssblk_segments[j] != '\0')) |
| 934 | { |
| 935 | j++; |
| 936 | } |
| 937 | if (dcssblk_segments[j] == '\0') |
| 938 | break; |
| 939 | i = j; |
| 940 | } |
| 941 | } |
| 942 | |
| 943 | /* |
Gerald Schaefer | c369527 | 2009-06-16 10:30:51 +0200 | [diff] [blame] | 944 | * Suspend / Resume |
| 945 | */ |
| 946 | static int dcssblk_freeze(struct device *dev) |
| 947 | { |
| 948 | struct dcssblk_dev_info *dev_info; |
| 949 | int rc = 0; |
| 950 | |
| 951 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { |
| 952 | switch (dev_info->segment_type) { |
| 953 | case SEG_TYPE_SR: |
| 954 | case SEG_TYPE_ER: |
| 955 | case SEG_TYPE_SC: |
| 956 | if (!dev_info->is_shared) |
| 957 | rc = -EINVAL; |
| 958 | break; |
| 959 | default: |
| 960 | rc = -EINVAL; |
| 961 | break; |
| 962 | } |
| 963 | if (rc) |
| 964 | break; |
| 965 | } |
| 966 | if (rc) |
Christian Borntraeger | 2c48c4d | 2009-07-07 16:37:11 +0200 | [diff] [blame] | 967 | pr_err("Suspending the system failed because DCSS device %s " |
| 968 | "is writable\n", |
Gerald Schaefer | c369527 | 2009-06-16 10:30:51 +0200 | [diff] [blame] | 969 | dev_info->segment_name); |
| 970 | return rc; |
| 971 | } |
| 972 | |
| 973 | static int dcssblk_restore(struct device *dev) |
| 974 | { |
| 975 | struct dcssblk_dev_info *dev_info; |
| 976 | struct segment_info *entry; |
| 977 | unsigned long start, end; |
| 978 | int rc = 0; |
| 979 | |
| 980 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { |
| 981 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
| 982 | segment_unload(entry->segment_name); |
| 983 | rc = segment_load(entry->segment_name, SEGMENT_SHARED, |
| 984 | &start, &end); |
| 985 | if (rc < 0) { |
| 986 | // TODO in_use check ? |
| 987 | segment_warning(rc, entry->segment_name); |
| 988 | goto out_panic; |
| 989 | } |
| 990 | if (start != entry->start || end != entry->end) { |
Christian Borntraeger | 2c48c4d | 2009-07-07 16:37:11 +0200 | [diff] [blame] | 991 | pr_err("The address range of DCSS %s changed " |
| 992 | "while the system was suspended\n", |
Gerald Schaefer | c369527 | 2009-06-16 10:30:51 +0200 | [diff] [blame] | 993 | entry->segment_name); |
| 994 | goto out_panic; |
| 995 | } |
| 996 | } |
| 997 | } |
| 998 | return 0; |
| 999 | out_panic: |
| 1000 | panic("fatal dcssblk resume error\n"); |
| 1001 | } |
| 1002 | |
| 1003 | static int dcssblk_thaw(struct device *dev) |
| 1004 | { |
| 1005 | return 0; |
| 1006 | } |
| 1007 | |
| 1008 | static struct dev_pm_ops dcssblk_pm_ops = { |
| 1009 | .freeze = dcssblk_freeze, |
| 1010 | .thaw = dcssblk_thaw, |
| 1011 | .restore = dcssblk_restore, |
| 1012 | }; |
| 1013 | |
| 1014 | static struct platform_driver dcssblk_pdrv = { |
| 1015 | .driver = { |
| 1016 | .name = "dcssblk", |
| 1017 | .owner = THIS_MODULE, |
| 1018 | .pm = &dcssblk_pm_ops, |
| 1019 | }, |
| 1020 | }; |
| 1021 | |
| 1022 | static struct platform_device *dcssblk_pdev; |
| 1023 | |
| 1024 | |
| 1025 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | * The init/exit functions. |
| 1027 | */ |
| 1028 | static void __exit |
| 1029 | dcssblk_exit(void) |
| 1030 | { |
Gerald Schaefer | c369527 | 2009-06-16 10:30:51 +0200 | [diff] [blame] | 1031 | platform_device_unregister(dcssblk_pdev); |
| 1032 | platform_driver_unregister(&dcssblk_pdrv); |
Mark McLoughlin | 035da16 | 2008-12-15 12:58:29 +0000 | [diff] [blame] | 1033 | root_device_unregister(dcssblk_root_dev); |
Akinobu Mita | 00d5940 | 2007-07-17 04:03:46 -0700 | [diff] [blame] | 1034 | unregister_blkdev(dcssblk_major, DCSSBLK_NAME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | } |
| 1036 | |
| 1037 | static int __init |
| 1038 | dcssblk_init(void) |
| 1039 | { |
| 1040 | int rc; |
| 1041 | |
Gerald Schaefer | c369527 | 2009-06-16 10:30:51 +0200 | [diff] [blame] | 1042 | rc = platform_driver_register(&dcssblk_pdrv); |
| 1043 | if (rc) |
| 1044 | return rc; |
| 1045 | |
| 1046 | dcssblk_pdev = platform_device_register_simple("dcssblk", -1, NULL, |
| 1047 | 0); |
| 1048 | if (IS_ERR(dcssblk_pdev)) { |
| 1049 | rc = PTR_ERR(dcssblk_pdev); |
| 1050 | goto out_pdrv; |
| 1051 | } |
| 1052 | |
Mark McLoughlin | 035da16 | 2008-12-15 12:58:29 +0000 | [diff] [blame] | 1053 | dcssblk_root_dev = root_device_register("dcssblk"); |
Gerald Schaefer | c369527 | 2009-06-16 10:30:51 +0200 | [diff] [blame] | 1054 | if (IS_ERR(dcssblk_root_dev)) { |
| 1055 | rc = PTR_ERR(dcssblk_root_dev); |
| 1056 | goto out_pdev; |
| 1057 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | rc = device_create_file(dcssblk_root_dev, &dev_attr_add); |
Gerald Schaefer | c369527 | 2009-06-16 10:30:51 +0200 | [diff] [blame] | 1059 | if (rc) |
| 1060 | goto out_root; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | rc = device_create_file(dcssblk_root_dev, &dev_attr_remove); |
Gerald Schaefer | c369527 | 2009-06-16 10:30:51 +0200 | [diff] [blame] | 1062 | if (rc) |
| 1063 | goto out_root; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | rc = register_blkdev(0, DCSSBLK_NAME); |
Gerald Schaefer | c369527 | 2009-06-16 10:30:51 +0200 | [diff] [blame] | 1065 | if (rc < 0) |
| 1066 | goto out_root; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | dcssblk_major = rc; |
| 1068 | init_rwsem(&dcssblk_devices_sem); |
| 1069 | |
| 1070 | dcssblk_check_params(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | return 0; |
Gerald Schaefer | c369527 | 2009-06-16 10:30:51 +0200 | [diff] [blame] | 1072 | |
| 1073 | out_root: |
| 1074 | root_device_unregister(dcssblk_root_dev); |
| 1075 | out_pdev: |
| 1076 | platform_device_unregister(dcssblk_pdev); |
| 1077 | out_pdrv: |
| 1078 | platform_driver_unregister(&dcssblk_pdrv); |
| 1079 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | } |
| 1081 | |
| 1082 | module_init(dcssblk_init); |
| 1083 | module_exit(dcssblk_exit); |
| 1084 | |
| 1085 | module_param_string(segments, dcssblk_segments, DCSSBLK_PARM_LEN, 0444); |
| 1086 | MODULE_PARM_DESC(segments, "Name of DCSS segment(s) to be loaded, " |
Hongjie Yang | b2300b9 | 2008-10-10 21:33:21 +0200 | [diff] [blame] | 1087 | "comma-separated list, names in each set separated " |
| 1088 | "by commas are separated by colons, each set contains " |
| 1089 | "names of contiguous segments and each name max. 8 chars.\n" |
| 1090 | "Adding \"(local)\" to the end of each set equals echoing 0 " |
| 1091 | "to /sys/devices/dcssblk/<device name>/shared after loading " |
| 1092 | "the contiguous segments - \n" |
| 1093 | "e.g. segments=\"mydcss1,mydcss2:mydcss3,mydcss4(local)\""); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | |
| 1095 | MODULE_LICENSE("GPL"); |