1 /* Copyright (c) 2013 Coraid, Inc. See COPYING for GPL terms. */ 2 /* 3 * aoeblk.c 4 * block device routines 5 */ 6 7 #include <linux/kernel.h> 8 #include <linux/hdreg.h> 9 #include <linux/blk-mq.h> 10 #include <linux/backing-dev.h> 11 #include <linux/fs.h> 12 #include <linux/ioctl.h> 13 #include <linux/slab.h> 14 #include <linux/ratelimit.h> 15 #include <linux/genhd.h> 16 #include <linux/netdevice.h> 17 #include <linux/mutex.h> 18 #include <linux/export.h> 19 #include <linux/moduleparam.h> 20 #include <linux/debugfs.h> 21 #include <scsi/sg.h> 22 #include "aoe.h" 23 24 static DEFINE_MUTEX(aoeblk_mutex); 25 static struct kmem_cache *buf_pool_cache; 26 static struct dentry *aoe_debugfs_dir; 27 28 /* GPFS needs a larger value than the default. */ 29 static int aoe_maxsectors; 30 module_param(aoe_maxsectors, int, 0644); 31 MODULE_PARM_DESC(aoe_maxsectors, 32 "When nonzero, set the maximum number of sectors per I/O request"); 33 34 static ssize_t aoedisk_show_state(struct device *dev, 35 struct device_attribute *attr, char *page) 36 { 37 struct gendisk *disk = dev_to_disk(dev); 38 struct aoedev *d = disk->private_data; 39 40 return snprintf(page, PAGE_SIZE, 41 "%s%s\n", 42 (d->flags & DEVFL_UP) ? "up" : "down", 43 (d->flags & DEVFL_KICKME) ? ",kickme" : 44 (d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : ""); 45 /* I'd rather see nopen exported so we can ditch closewait */ 46 } 47 static ssize_t aoedisk_show_mac(struct device *dev, 48 struct device_attribute *attr, char *page) 49 { 50 struct gendisk *disk = dev_to_disk(dev); 51 struct aoedev *d = disk->private_data; 52 struct aoetgt *t = d->targets[0]; 53 54 if (t == NULL) 55 return snprintf(page, PAGE_SIZE, "none\n"); 56 return snprintf(page, PAGE_SIZE, "%pm\n", t->addr); 57 } 58 static ssize_t aoedisk_show_netif(struct device *dev, 59 struct device_attribute *attr, char *page) 60 { 61 struct gendisk *disk = dev_to_disk(dev); 62 struct aoedev *d = disk->private_data; 63 struct net_device *nds[8], **nd, **nnd, **ne; 64 struct aoetgt **t, **te; 65 struct aoeif *ifp, *e; 66 char *p; 67 68 memset(nds, 0, sizeof nds); 69 nd = nds; 70 ne = nd + ARRAY_SIZE(nds); 71 t = d->targets; 72 te = t + d->ntargets; 73 for (; t < te && *t; t++) { 74 ifp = (*t)->ifs; 75 e = ifp + NAOEIFS; 76 for (; ifp < e && ifp->nd; ifp++) { 77 for (nnd = nds; nnd < nd; nnd++) 78 if (*nnd == ifp->nd) 79 break; 80 if (nnd == nd && nd != ne) 81 *nd++ = ifp->nd; 82 } 83 } 84 85 ne = nd; 86 nd = nds; 87 if (*nd == NULL) 88 return snprintf(page, PAGE_SIZE, "none\n"); 89 for (p = page; nd < ne; nd++) 90 p += snprintf(p, PAGE_SIZE - (p-page), "%s%s", 91 p == page ? "" : ",", (*nd)->name); 92 p += snprintf(p, PAGE_SIZE - (p-page), "\n"); 93 return p-page; 94 } 95 /* firmware version */ 96 static ssize_t aoedisk_show_fwver(struct device *dev, 97 struct device_attribute *attr, char *page) 98 { 99 struct gendisk *disk = dev_to_disk(dev); 100 struct aoedev *d = disk->private_data; 101 102 return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver); 103 } 104 static ssize_t aoedisk_show_payload(struct device *dev, 105 struct device_attribute *attr, char *page) 106 { 107 struct gendisk *disk = dev_to_disk(dev); 108 struct aoedev *d = disk->private_data; 109 110 return snprintf(page, PAGE_SIZE, "%lu\n", d->maxbcnt); 111 } 112 113 static int aoedisk_debugfs_show(struct seq_file *s, void *ignored) 114 { 115 struct aoedev *d; 116 struct aoetgt **t, **te; 117 struct aoeif *ifp, *ife; 118 unsigned long flags; 119 char c; 120 121 d = s->private; 122 seq_printf(s, "rttavg: %d rttdev: %d\n", 123 d->rttavg >> RTTSCALE, 124 d->rttdev >> RTTDSCALE); 125 seq_printf(s, "nskbpool: %d\n", skb_queue_len(&d->skbpool)); 126 seq_printf(s, "kicked: %ld\n", d->kicked); 127 seq_printf(s, "maxbcnt: %ld\n", d->maxbcnt); 128 seq_printf(s, "ref: %ld\n", d->ref); 129 130 spin_lock_irqsave(&d->lock, flags); 131 t = d->targets; 132 te = t + d->ntargets; 133 for (; t < te && *t; t++) { 134 c = '\t'; 135 seq_printf(s, "falloc: %ld\n", (*t)->falloc); 136 seq_printf(s, "ffree: %p\n", 137 list_empty(&(*t)->ffree) ? NULL : (*t)->ffree.next); 138 seq_printf(s, "%pm:%d:%d:%d\n", (*t)->addr, (*t)->nout, 139 (*t)->maxout, (*t)->nframes); 140 seq_printf(s, "\tssthresh:%d\n", (*t)->ssthresh); 141 seq_printf(s, "\ttaint:%d\n", (*t)->taint); 142 seq_printf(s, "\tr:%d\n", (*t)->rpkts); 143 seq_printf(s, "\tw:%d\n", (*t)->wpkts); 144 ifp = (*t)->ifs; 145 ife = ifp + ARRAY_SIZE((*t)->ifs); 146 for (; ifp->nd && ifp < ife; ifp++) { 147 seq_printf(s, "%c%s", c, ifp->nd->name); 148 c = ','; 149 } 150 seq_puts(s, "\n"); 151 } 152 spin_unlock_irqrestore(&d->lock, flags); 153 154 return 0; 155 } 156 157 static int aoe_debugfs_open(struct inode *inode, struct file *file) 158 { 159 return single_open(file, aoedisk_debugfs_show, inode->i_private); 160 } 161 162 static DEVICE_ATTR(state, 0444, aoedisk_show_state, NULL); 163 static DEVICE_ATTR(mac, 0444, aoedisk_show_mac, NULL); 164 static DEVICE_ATTR(netif, 0444, aoedisk_show_netif, NULL); 165 static struct device_attribute dev_attr_firmware_version = { 166 .attr = { .name = "firmware-version", .mode = 0444 }, 167 .show = aoedisk_show_fwver, 168 }; 169 static DEVICE_ATTR(payload, 0444, aoedisk_show_payload, NULL); 170 171 static struct attribute *aoe_attrs[] = { 172 &dev_attr_state.attr, 173 &dev_attr_mac.attr, 174 &dev_attr_netif.attr, 175 &dev_attr_firmware_version.attr, 176 &dev_attr_payload.attr, 177 NULL, 178 }; 179 180 static const struct attribute_group aoe_attr_group = { 181 .attrs = aoe_attrs, 182 }; 183 184 static const struct attribute_group *aoe_attr_groups[] = { 185 &aoe_attr_group, 186 NULL, 187 }; 188 189 static const struct file_operations aoe_debugfs_fops = { 190 .open = aoe_debugfs_open, 191 .read = seq_read, 192 .llseek = seq_lseek, 193 .release = single_release, 194 }; 195 196 static void 197 aoedisk_add_debugfs(struct aoedev *d) 198 { 199 struct dentry *entry; 200 char *p; 201 202 if (aoe_debugfs_dir == NULL) 203 return; 204 p = strchr(d->gd->disk_name, '/'); 205 if (p == NULL) 206 p = d->gd->disk_name; 207 else 208 p++; 209 BUG_ON(*p == '\0'); 210 entry = debugfs_create_file(p, 0444, aoe_debugfs_dir, d, 211 &aoe_debugfs_fops); 212 if (IS_ERR_OR_NULL(entry)) { 213 pr_info("aoe: cannot create debugfs file for %s\n", 214 d->gd->disk_name); 215 return; 216 } 217 BUG_ON(d->debugfs); 218 d->debugfs = entry; 219 } 220 void 221 aoedisk_rm_debugfs(struct aoedev *d) 222 { 223 debugfs_remove(d->debugfs); 224 d->debugfs = NULL; 225 } 226 227 static int 228 aoeblk_open(struct block_device *bdev, fmode_t mode) 229 { 230 struct aoedev *d = bdev->bd_disk->private_data; 231 ulong flags; 232 233 if (!virt_addr_valid(d)) { 234 pr_crit("aoe: invalid device pointer in %s\n", 235 __func__); 236 WARN_ON(1); 237 return -ENODEV; 238 } 239 if (!(d->flags & DEVFL_UP) || d->flags & DEVFL_TKILL) 240 return -ENODEV; 241 242 mutex_lock(&aoeblk_mutex); 243 spin_lock_irqsave(&d->lock, flags); 244 if (d->flags & DEVFL_UP && !(d->flags & DEVFL_TKILL)) { 245 d->nopen++; 246 spin_unlock_irqrestore(&d->lock, flags); 247 mutex_unlock(&aoeblk_mutex); 248 return 0; 249 } 250 spin_unlock_irqrestore(&d->lock, flags); 251 mutex_unlock(&aoeblk_mutex); 252 return -ENODEV; 253 } 254 255 static void 256 aoeblk_release(struct gendisk *disk, fmode_t mode) 257 { 258 struct aoedev *d = disk->private_data; 259 ulong flags; 260 261 spin_lock_irqsave(&d->lock, flags); 262 263 if (--d->nopen == 0) { 264 spin_unlock_irqrestore(&d->lock, flags); 265 aoecmd_cfg(d->aoemajor, d->aoeminor); 266 return; 267 } 268 spin_unlock_irqrestore(&d->lock, flags); 269 } 270 271 static blk_status_t aoeblk_queue_rq(struct blk_mq_hw_ctx *hctx, 272 const struct blk_mq_queue_data *bd) 273 { 274 struct aoedev *d = hctx->queue->queuedata; 275 276 spin_lock_irq(&d->lock); 277 278 if ((d->flags & DEVFL_UP) == 0) { 279 pr_info_ratelimited("aoe: device %ld.%d is not up\n", 280 d->aoemajor, d->aoeminor); 281 spin_unlock_irq(&d->lock); 282 blk_mq_start_request(bd->rq); 283 return BLK_STS_IOERR; 284 } 285 286 list_add_tail(&bd->rq->queuelist, &d->rq_list); 287 aoecmd_work(d); 288 spin_unlock_irq(&d->lock); 289 return BLK_STS_OK; 290 } 291 292 static int 293 aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo) 294 { 295 struct aoedev *d = bdev->bd_disk->private_data; 296 297 if ((d->flags & DEVFL_UP) == 0) { 298 printk(KERN_ERR "aoe: disk not up\n"); 299 return -ENODEV; 300 } 301 302 geo->cylinders = d->geo.cylinders; 303 geo->heads = d->geo.heads; 304 geo->sectors = d->geo.sectors; 305 return 0; 306 } 307 308 static int 309 aoeblk_ioctl(struct block_device *bdev, fmode_t mode, uint cmd, ulong arg) 310 { 311 struct aoedev *d; 312 313 if (!arg) 314 return -EINVAL; 315 316 d = bdev->bd_disk->private_data; 317 if ((d->flags & DEVFL_UP) == 0) { 318 pr_err("aoe: disk not up\n"); 319 return -ENODEV; 320 } 321 322 if (cmd == HDIO_GET_IDENTITY) { 323 if (!copy_to_user((void __user *) arg, &d->ident, 324 sizeof(d->ident))) 325 return 0; 326 return -EFAULT; 327 } 328 329 /* udev calls scsi_id, which uses SG_IO, resulting in noise */ 330 if (cmd != SG_IO) 331 pr_info("aoe: unknown ioctl 0x%x\n", cmd); 332 333 return -ENOTTY; 334 } 335 336 static const struct block_device_operations aoe_bdops = { 337 .open = aoeblk_open, 338 .release = aoeblk_release, 339 .ioctl = aoeblk_ioctl, 340 .getgeo = aoeblk_getgeo, 341 .owner = THIS_MODULE, 342 }; 343 344 static const struct blk_mq_ops aoeblk_mq_ops = { 345 .queue_rq = aoeblk_queue_rq, 346 }; 347 348 /* alloc_disk and add_disk can sleep */ 349 void 350 aoeblk_gdalloc(void *vp) 351 { 352 struct aoedev *d = vp; 353 struct gendisk *gd; 354 mempool_t *mp; 355 struct request_queue *q; 356 struct blk_mq_tag_set *set; 357 enum { KB = 1024, MB = KB * KB, READ_AHEAD = 2 * MB, }; 358 ulong flags; 359 int late = 0; 360 int err; 361 362 spin_lock_irqsave(&d->lock, flags); 363 if (d->flags & DEVFL_GDALLOC 364 && !(d->flags & DEVFL_TKILL) 365 && !(d->flags & DEVFL_GD_NOW)) 366 d->flags |= DEVFL_GD_NOW; 367 else 368 late = 1; 369 spin_unlock_irqrestore(&d->lock, flags); 370 if (late) 371 return; 372 373 gd = alloc_disk(AOE_PARTITIONS); 374 if (gd == NULL) { 375 pr_err("aoe: cannot allocate disk structure for %ld.%d\n", 376 d->aoemajor, d->aoeminor); 377 goto err; 378 } 379 380 mp = mempool_create(MIN_BUFS, mempool_alloc_slab, mempool_free_slab, 381 buf_pool_cache); 382 if (mp == NULL) { 383 printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n", 384 d->aoemajor, d->aoeminor); 385 goto err_disk; 386 } 387 388 set = &d->tag_set; 389 set->ops = &aoeblk_mq_ops; 390 set->cmd_size = sizeof(struct aoe_req); 391 set->nr_hw_queues = 1; 392 set->queue_depth = 128; 393 set->numa_node = NUMA_NO_NODE; 394 set->flags = BLK_MQ_F_SHOULD_MERGE; 395 err = blk_mq_alloc_tag_set(set); 396 if (err) { 397 pr_err("aoe: cannot allocate tag set for %ld.%d\n", 398 d->aoemajor, d->aoeminor); 399 goto err_mempool; 400 } 401 402 q = blk_mq_init_queue(set); 403 if (IS_ERR(q)) { 404 pr_err("aoe: cannot allocate block queue for %ld.%d\n", 405 d->aoemajor, d->aoeminor); 406 blk_mq_free_tag_set(set); 407 goto err_mempool; 408 } 409 410 spin_lock_irqsave(&d->lock, flags); 411 WARN_ON(!(d->flags & DEVFL_GD_NOW)); 412 WARN_ON(!(d->flags & DEVFL_GDALLOC)); 413 WARN_ON(d->flags & DEVFL_TKILL); 414 WARN_ON(d->gd); 415 WARN_ON(d->flags & DEVFL_UP); 416 blk_queue_max_hw_sectors(q, BLK_DEF_MAX_SECTORS); 417 q->backing_dev_info->name = "aoe"; 418 q->backing_dev_info->ra_pages = READ_AHEAD / PAGE_SIZE; 419 d->bufpool = mp; 420 d->blkq = gd->queue = q; 421 q->queuedata = d; 422 d->gd = gd; 423 if (aoe_maxsectors) 424 blk_queue_max_hw_sectors(q, aoe_maxsectors); 425 gd->major = AOE_MAJOR; 426 gd->first_minor = d->sysminor; 427 gd->fops = &aoe_bdops; 428 gd->private_data = d; 429 set_capacity(gd, d->ssize); 430 snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d", 431 d->aoemajor, d->aoeminor); 432 433 d->flags &= ~DEVFL_GDALLOC; 434 d->flags |= DEVFL_UP; 435 436 spin_unlock_irqrestore(&d->lock, flags); 437 438 device_add_disk(NULL, gd, aoe_attr_groups); 439 aoedisk_add_debugfs(d); 440 441 spin_lock_irqsave(&d->lock, flags); 442 WARN_ON(!(d->flags & DEVFL_GD_NOW)); 443 d->flags &= ~DEVFL_GD_NOW; 444 spin_unlock_irqrestore(&d->lock, flags); 445 return; 446 447 err_mempool: 448 mempool_destroy(mp); 449 err_disk: 450 put_disk(gd); 451 err: 452 spin_lock_irqsave(&d->lock, flags); 453 d->flags &= ~DEVFL_GD_NOW; 454 schedule_work(&d->work); 455 spin_unlock_irqrestore(&d->lock, flags); 456 } 457 458 void 459 aoeblk_exit(void) 460 { 461 debugfs_remove_recursive(aoe_debugfs_dir); 462 aoe_debugfs_dir = NULL; 463 kmem_cache_destroy(buf_pool_cache); 464 } 465 466 int __init 467 aoeblk_init(void) 468 { 469 buf_pool_cache = kmem_cache_create("aoe_bufs", 470 sizeof(struct buf), 471 0, 0, NULL); 472 if (buf_pool_cache == NULL) 473 return -ENOMEM; 474 aoe_debugfs_dir = debugfs_create_dir("aoe", NULL); 475 if (IS_ERR_OR_NULL(aoe_debugfs_dir)) { 476 pr_info("aoe: cannot create debugfs directory\n"); 477 aoe_debugfs_dir = NULL; 478 } 479 return 0; 480 } 481 482