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 sysfs_emit(page, "%s%s\n", 41 (d->flags & DEVFL_UP) ? "up" : "down", 42 (d->flags & DEVFL_KICKME) ? ",kickme" : 43 (d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : ""); 44 /* I'd rather see nopen exported so we can ditch closewait */ 45 } 46 static ssize_t aoedisk_show_mac(struct device *dev, 47 struct device_attribute *attr, char *page) 48 { 49 struct gendisk *disk = dev_to_disk(dev); 50 struct aoedev *d = disk->private_data; 51 struct aoetgt *t = d->targets[0]; 52 53 if (t == NULL) 54 return sysfs_emit(page, "none\n"); 55 return sysfs_emit(page, "%pm\n", t->addr); 56 } 57 static ssize_t aoedisk_show_netif(struct device *dev, 58 struct device_attribute *attr, char *page) 59 { 60 struct gendisk *disk = dev_to_disk(dev); 61 struct aoedev *d = disk->private_data; 62 struct net_device *nds[8], **nd, **nnd, **ne; 63 struct aoetgt **t, **te; 64 struct aoeif *ifp, *e; 65 char *p; 66 67 memset(nds, 0, sizeof nds); 68 nd = nds; 69 ne = nd + ARRAY_SIZE(nds); 70 t = d->targets; 71 te = t + d->ntargets; 72 for (; t < te && *t; t++) { 73 ifp = (*t)->ifs; 74 e = ifp + NAOEIFS; 75 for (; ifp < e && ifp->nd; ifp++) { 76 for (nnd = nds; nnd < nd; nnd++) 77 if (*nnd == ifp->nd) 78 break; 79 if (nnd == nd && nd != ne) 80 *nd++ = ifp->nd; 81 } 82 } 83 84 ne = nd; 85 nd = nds; 86 if (*nd == NULL) 87 return sysfs_emit(page, "none\n"); 88 for (p = page; nd < ne; nd++) 89 p += scnprintf(p, PAGE_SIZE - (p-page), "%s%s", 90 p == page ? "" : ",", (*nd)->name); 91 p += scnprintf(p, PAGE_SIZE - (p-page), "\n"); 92 return p-page; 93 } 94 /* firmware version */ 95 static ssize_t aoedisk_show_fwver(struct device *dev, 96 struct device_attribute *attr, char *page) 97 { 98 struct gendisk *disk = dev_to_disk(dev); 99 struct aoedev *d = disk->private_data; 100 101 return sysfs_emit(page, "0x%04x\n", (unsigned int) d->fw_ver); 102 } 103 static ssize_t aoedisk_show_payload(struct device *dev, 104 struct device_attribute *attr, char *page) 105 { 106 struct gendisk *disk = dev_to_disk(dev); 107 struct aoedev *d = disk->private_data; 108 109 return sysfs_emit(page, "%lu\n", d->maxbcnt); 110 } 111 112 static int aoedisk_debugfs_show(struct seq_file *s, void *ignored) 113 { 114 struct aoedev *d; 115 struct aoetgt **t, **te; 116 struct aoeif *ifp, *ife; 117 unsigned long flags; 118 char c; 119 120 d = s->private; 121 seq_printf(s, "rttavg: %d rttdev: %d\n", 122 d->rttavg >> RTTSCALE, 123 d->rttdev >> RTTDSCALE); 124 seq_printf(s, "nskbpool: %d\n", skb_queue_len(&d->skbpool)); 125 seq_printf(s, "kicked: %ld\n", d->kicked); 126 seq_printf(s, "maxbcnt: %ld\n", d->maxbcnt); 127 seq_printf(s, "ref: %ld\n", d->ref); 128 129 spin_lock_irqsave(&d->lock, flags); 130 t = d->targets; 131 te = t + d->ntargets; 132 for (; t < te && *t; t++) { 133 c = '\t'; 134 seq_printf(s, "falloc: %ld\n", (*t)->falloc); 135 seq_printf(s, "ffree: %p\n", 136 list_empty(&(*t)->ffree) ? NULL : (*t)->ffree.next); 137 seq_printf(s, "%pm:%d:%d:%d\n", (*t)->addr, (*t)->nout, 138 (*t)->maxout, (*t)->nframes); 139 seq_printf(s, "\tssthresh:%d\n", (*t)->ssthresh); 140 seq_printf(s, "\ttaint:%d\n", (*t)->taint); 141 seq_printf(s, "\tr:%d\n", (*t)->rpkts); 142 seq_printf(s, "\tw:%d\n", (*t)->wpkts); 143 ifp = (*t)->ifs; 144 ife = ifp + ARRAY_SIZE((*t)->ifs); 145 for (; ifp->nd && ifp < ife; ifp++) { 146 seq_printf(s, "%c%s", c, ifp->nd->name); 147 c = ','; 148 } 149 seq_puts(s, "\n"); 150 } 151 spin_unlock_irqrestore(&d->lock, flags); 152 153 return 0; 154 } 155 156 static int aoe_debugfs_open(struct inode *inode, struct file *file) 157 { 158 return single_open(file, aoedisk_debugfs_show, inode->i_private); 159 } 160 161 static DEVICE_ATTR(state, 0444, aoedisk_show_state, NULL); 162 static DEVICE_ATTR(mac, 0444, aoedisk_show_mac, NULL); 163 static DEVICE_ATTR(netif, 0444, aoedisk_show_netif, NULL); 164 static struct device_attribute dev_attr_firmware_version = { 165 .attr = { .name = "firmware-version", .mode = 0444 }, 166 .show = aoedisk_show_fwver, 167 }; 168 static DEVICE_ATTR(payload, 0444, aoedisk_show_payload, NULL); 169 170 static struct attribute *aoe_attrs[] = { 171 &dev_attr_state.attr, 172 &dev_attr_mac.attr, 173 &dev_attr_netif.attr, 174 &dev_attr_firmware_version.attr, 175 &dev_attr_payload.attr, 176 NULL, 177 }; 178 179 static const struct attribute_group aoe_attr_group = { 180 .attrs = aoe_attrs, 181 }; 182 183 static const struct attribute_group *aoe_attr_groups[] = { 184 &aoe_attr_group, 185 NULL, 186 }; 187 188 static const struct file_operations aoe_debugfs_fops = { 189 .open = aoe_debugfs_open, 190 .read = seq_read, 191 .llseek = seq_lseek, 192 .release = single_release, 193 }; 194 195 static void 196 aoedisk_add_debugfs(struct aoedev *d) 197 { 198 char *p; 199 200 if (aoe_debugfs_dir == NULL) 201 return; 202 p = strchr(d->gd->disk_name, '/'); 203 if (p == NULL) 204 p = d->gd->disk_name; 205 else 206 p++; 207 BUG_ON(*p == '\0'); 208 d->debugfs = debugfs_create_file(p, 0444, aoe_debugfs_dir, d, 209 &aoe_debugfs_fops); 210 } 211 void 212 aoedisk_rm_debugfs(struct aoedev *d) 213 { 214 debugfs_remove(d->debugfs); 215 d->debugfs = NULL; 216 } 217 218 static int 219 aoeblk_open(struct block_device *bdev, fmode_t mode) 220 { 221 struct aoedev *d = bdev->bd_disk->private_data; 222 ulong flags; 223 224 if (!virt_addr_valid(d)) { 225 pr_crit("aoe: invalid device pointer in %s\n", 226 __func__); 227 WARN_ON(1); 228 return -ENODEV; 229 } 230 if (!(d->flags & DEVFL_UP) || d->flags & DEVFL_TKILL) 231 return -ENODEV; 232 233 mutex_lock(&aoeblk_mutex); 234 spin_lock_irqsave(&d->lock, flags); 235 if (d->flags & DEVFL_UP && !(d->flags & DEVFL_TKILL)) { 236 d->nopen++; 237 spin_unlock_irqrestore(&d->lock, flags); 238 mutex_unlock(&aoeblk_mutex); 239 return 0; 240 } 241 spin_unlock_irqrestore(&d->lock, flags); 242 mutex_unlock(&aoeblk_mutex); 243 return -ENODEV; 244 } 245 246 static void 247 aoeblk_release(struct gendisk *disk, fmode_t mode) 248 { 249 struct aoedev *d = disk->private_data; 250 ulong flags; 251 252 spin_lock_irqsave(&d->lock, flags); 253 254 if (--d->nopen == 0) { 255 spin_unlock_irqrestore(&d->lock, flags); 256 aoecmd_cfg(d->aoemajor, d->aoeminor); 257 return; 258 } 259 spin_unlock_irqrestore(&d->lock, flags); 260 } 261 262 static blk_status_t aoeblk_queue_rq(struct blk_mq_hw_ctx *hctx, 263 const struct blk_mq_queue_data *bd) 264 { 265 struct aoedev *d = hctx->queue->queuedata; 266 267 spin_lock_irq(&d->lock); 268 269 if ((d->flags & DEVFL_UP) == 0) { 270 pr_info_ratelimited("aoe: device %ld.%d is not up\n", 271 d->aoemajor, d->aoeminor); 272 spin_unlock_irq(&d->lock); 273 blk_mq_start_request(bd->rq); 274 return BLK_STS_IOERR; 275 } 276 277 list_add_tail(&bd->rq->queuelist, &d->rq_list); 278 aoecmd_work(d); 279 spin_unlock_irq(&d->lock); 280 return BLK_STS_OK; 281 } 282 283 static int 284 aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo) 285 { 286 struct aoedev *d = bdev->bd_disk->private_data; 287 288 if ((d->flags & DEVFL_UP) == 0) { 289 printk(KERN_ERR "aoe: disk not up\n"); 290 return -ENODEV; 291 } 292 293 geo->cylinders = d->geo.cylinders; 294 geo->heads = d->geo.heads; 295 geo->sectors = d->geo.sectors; 296 return 0; 297 } 298 299 static int 300 aoeblk_ioctl(struct block_device *bdev, fmode_t mode, uint cmd, ulong arg) 301 { 302 struct aoedev *d; 303 304 if (!arg) 305 return -EINVAL; 306 307 d = bdev->bd_disk->private_data; 308 if ((d->flags & DEVFL_UP) == 0) { 309 pr_err("aoe: disk not up\n"); 310 return -ENODEV; 311 } 312 313 if (cmd == HDIO_GET_IDENTITY) { 314 if (!copy_to_user((void __user *) arg, &d->ident, 315 sizeof(d->ident))) 316 return 0; 317 return -EFAULT; 318 } 319 320 /* udev calls scsi_id, which uses SG_IO, resulting in noise */ 321 if (cmd != SG_IO) 322 pr_info("aoe: unknown ioctl 0x%x\n", cmd); 323 324 return -ENOTTY; 325 } 326 327 static const struct block_device_operations aoe_bdops = { 328 .open = aoeblk_open, 329 .release = aoeblk_release, 330 .ioctl = aoeblk_ioctl, 331 .compat_ioctl = blkdev_compat_ptr_ioctl, 332 .getgeo = aoeblk_getgeo, 333 .owner = THIS_MODULE, 334 }; 335 336 static const struct blk_mq_ops aoeblk_mq_ops = { 337 .queue_rq = aoeblk_queue_rq, 338 }; 339 340 /* blk_mq_alloc_disk and add_disk can sleep */ 341 void 342 aoeblk_gdalloc(void *vp) 343 { 344 struct aoedev *d = vp; 345 struct gendisk *gd; 346 mempool_t *mp; 347 struct blk_mq_tag_set *set; 348 ulong flags; 349 int late = 0; 350 int err; 351 352 spin_lock_irqsave(&d->lock, flags); 353 if (d->flags & DEVFL_GDALLOC 354 && !(d->flags & DEVFL_TKILL) 355 && !(d->flags & DEVFL_GD_NOW)) 356 d->flags |= DEVFL_GD_NOW; 357 else 358 late = 1; 359 spin_unlock_irqrestore(&d->lock, flags); 360 if (late) 361 return; 362 363 mp = mempool_create(MIN_BUFS, mempool_alloc_slab, mempool_free_slab, 364 buf_pool_cache); 365 if (mp == NULL) { 366 printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n", 367 d->aoemajor, d->aoeminor); 368 goto err; 369 } 370 371 set = &d->tag_set; 372 set->ops = &aoeblk_mq_ops; 373 set->cmd_size = sizeof(struct aoe_req); 374 set->nr_hw_queues = 1; 375 set->queue_depth = 128; 376 set->numa_node = NUMA_NO_NODE; 377 set->flags = BLK_MQ_F_SHOULD_MERGE; 378 err = blk_mq_alloc_tag_set(set); 379 if (err) { 380 pr_err("aoe: cannot allocate tag set for %ld.%d\n", 381 d->aoemajor, d->aoeminor); 382 goto err_mempool; 383 } 384 385 gd = blk_mq_alloc_disk(set, d); 386 if (IS_ERR(gd)) { 387 pr_err("aoe: cannot allocate block queue for %ld.%d\n", 388 d->aoemajor, d->aoeminor); 389 goto err_tagset; 390 } 391 392 spin_lock_irqsave(&d->lock, flags); 393 WARN_ON(!(d->flags & DEVFL_GD_NOW)); 394 WARN_ON(!(d->flags & DEVFL_GDALLOC)); 395 WARN_ON(d->flags & DEVFL_TKILL); 396 WARN_ON(d->gd); 397 WARN_ON(d->flags & DEVFL_UP); 398 blk_queue_max_hw_sectors(gd->queue, BLK_DEF_MAX_SECTORS); 399 blk_queue_io_opt(gd->queue, SZ_2M); 400 d->bufpool = mp; 401 d->blkq = gd->queue; 402 d->gd = gd; 403 if (aoe_maxsectors) 404 blk_queue_max_hw_sectors(gd->queue, aoe_maxsectors); 405 gd->major = AOE_MAJOR; 406 gd->first_minor = d->sysminor; 407 gd->minors = AOE_PARTITIONS; 408 gd->fops = &aoe_bdops; 409 gd->private_data = d; 410 set_capacity(gd, d->ssize); 411 snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d", 412 d->aoemajor, d->aoeminor); 413 414 d->flags &= ~DEVFL_GDALLOC; 415 d->flags |= DEVFL_UP; 416 417 spin_unlock_irqrestore(&d->lock, flags); 418 419 err = device_add_disk(NULL, gd, aoe_attr_groups); 420 if (err) 421 goto out_disk_cleanup; 422 aoedisk_add_debugfs(d); 423 424 spin_lock_irqsave(&d->lock, flags); 425 WARN_ON(!(d->flags & DEVFL_GD_NOW)); 426 d->flags &= ~DEVFL_GD_NOW; 427 spin_unlock_irqrestore(&d->lock, flags); 428 return; 429 430 out_disk_cleanup: 431 blk_cleanup_disk(gd); 432 err_tagset: 433 blk_mq_free_tag_set(set); 434 err_mempool: 435 mempool_destroy(mp); 436 err: 437 spin_lock_irqsave(&d->lock, flags); 438 d->flags &= ~DEVFL_GD_NOW; 439 schedule_work(&d->work); 440 spin_unlock_irqrestore(&d->lock, flags); 441 } 442 443 void 444 aoeblk_exit(void) 445 { 446 debugfs_remove_recursive(aoe_debugfs_dir); 447 aoe_debugfs_dir = NULL; 448 kmem_cache_destroy(buf_pool_cache); 449 } 450 451 int __init 452 aoeblk_init(void) 453 { 454 buf_pool_cache = kmem_cache_create("aoe_bufs", 455 sizeof(struct buf), 456 0, 0, NULL); 457 if (buf_pool_cache == NULL) 458 return -ENOMEM; 459 aoe_debugfs_dir = debugfs_create_dir("aoe", NULL); 460 return 0; 461 } 462 463