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/netdevice.h> 16 #include <linux/mutex.h> 17 #include <linux/export.h> 18 #include <linux/moduleparam.h> 19 #include <linux/debugfs.h> 20 #include <scsi/sg.h> 21 #include "aoe.h" 22 23 static DEFINE_MUTEX(aoeblk_mutex); 24 static struct kmem_cache *buf_pool_cache; 25 static struct dentry *aoe_debugfs_dir; 26 27 /* GPFS needs a larger value than the default. */ 28 static int aoe_maxsectors; 29 module_param(aoe_maxsectors, int, 0644); 30 MODULE_PARM_DESC(aoe_maxsectors, 31 "When nonzero, set the maximum number of sectors per I/O request"); 32 33 static ssize_t aoedisk_show_state(struct device *dev, 34 struct device_attribute *attr, char *page) 35 { 36 struct gendisk *disk = dev_to_disk(dev); 37 struct aoedev *d = disk->private_data; 38 39 return sysfs_emit(page, "%s%s\n", 40 (d->flags & DEVFL_UP) ? "up" : "down", 41 (d->flags & DEVFL_KICKME) ? ",kickme" : 42 (d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : ""); 43 /* I'd rather see nopen exported so we can ditch closewait */ 44 } 45 static ssize_t aoedisk_show_mac(struct device *dev, 46 struct device_attribute *attr, char *page) 47 { 48 struct gendisk *disk = dev_to_disk(dev); 49 struct aoedev *d = disk->private_data; 50 struct aoetgt *t = d->targets[0]; 51 52 if (t == NULL) 53 return sysfs_emit(page, "none\n"); 54 return sysfs_emit(page, "%pm\n", t->addr); 55 } 56 static ssize_t aoedisk_show_netif(struct device *dev, 57 struct device_attribute *attr, char *page) 58 { 59 struct gendisk *disk = dev_to_disk(dev); 60 struct aoedev *d = disk->private_data; 61 struct net_device *nds[8], **nd, **nnd, **ne; 62 struct aoetgt **t, **te; 63 struct aoeif *ifp, *e; 64 char *p; 65 66 memset(nds, 0, sizeof nds); 67 nd = nds; 68 ne = nd + ARRAY_SIZE(nds); 69 t = d->targets; 70 te = t + d->ntargets; 71 for (; t < te && *t; t++) { 72 ifp = (*t)->ifs; 73 e = ifp + NAOEIFS; 74 for (; ifp < e && ifp->nd; ifp++) { 75 for (nnd = nds; nnd < nd; nnd++) 76 if (*nnd == ifp->nd) 77 break; 78 if (nnd == nd && nd != ne) 79 *nd++ = ifp->nd; 80 } 81 } 82 83 ne = nd; 84 nd = nds; 85 if (*nd == NULL) 86 return sysfs_emit(page, "none\n"); 87 for (p = page; nd < ne; nd++) 88 p += scnprintf(p, PAGE_SIZE - (p-page), "%s%s", 89 p == page ? "" : ",", (*nd)->name); 90 p += scnprintf(p, PAGE_SIZE - (p-page), "\n"); 91 return p-page; 92 } 93 /* firmware version */ 94 static ssize_t aoedisk_show_fwver(struct device *dev, 95 struct device_attribute *attr, char *page) 96 { 97 struct gendisk *disk = dev_to_disk(dev); 98 struct aoedev *d = disk->private_data; 99 100 return sysfs_emit(page, "0x%04x\n", (unsigned int) d->fw_ver); 101 } 102 static ssize_t aoedisk_show_payload(struct device *dev, 103 struct device_attribute *attr, char *page) 104 { 105 struct gendisk *disk = dev_to_disk(dev); 106 struct aoedev *d = disk->private_data; 107 108 return sysfs_emit(page, "%lu\n", d->maxbcnt); 109 } 110 111 static int aoedisk_debugfs_show(struct seq_file *s, void *ignored) 112 { 113 struct aoedev *d; 114 struct aoetgt **t, **te; 115 struct aoeif *ifp, *ife; 116 unsigned long flags; 117 char c; 118 119 d = s->private; 120 seq_printf(s, "rttavg: %d rttdev: %d\n", 121 d->rttavg >> RTTSCALE, 122 d->rttdev >> RTTDSCALE); 123 seq_printf(s, "nskbpool: %d\n", skb_queue_len(&d->skbpool)); 124 seq_printf(s, "kicked: %ld\n", d->kicked); 125 seq_printf(s, "maxbcnt: %ld\n", d->maxbcnt); 126 seq_printf(s, "ref: %ld\n", d->ref); 127 128 spin_lock_irqsave(&d->lock, flags); 129 t = d->targets; 130 te = t + d->ntargets; 131 for (; t < te && *t; t++) { 132 c = '\t'; 133 seq_printf(s, "falloc: %ld\n", (*t)->falloc); 134 seq_printf(s, "ffree: %p\n", 135 list_empty(&(*t)->ffree) ? NULL : (*t)->ffree.next); 136 seq_printf(s, "%pm:%d:%d:%d\n", (*t)->addr, (*t)->nout, 137 (*t)->maxout, (*t)->nframes); 138 seq_printf(s, "\tssthresh:%d\n", (*t)->ssthresh); 139 seq_printf(s, "\ttaint:%d\n", (*t)->taint); 140 seq_printf(s, "\tr:%d\n", (*t)->rpkts); 141 seq_printf(s, "\tw:%d\n", (*t)->wpkts); 142 ifp = (*t)->ifs; 143 ife = ifp + ARRAY_SIZE((*t)->ifs); 144 for (; ifp->nd && ifp < ife; ifp++) { 145 seq_printf(s, "%c%s", c, ifp->nd->name); 146 c = ','; 147 } 148 seq_puts(s, "\n"); 149 } 150 spin_unlock_irqrestore(&d->lock, flags); 151 152 return 0; 153 } 154 155 static int aoe_debugfs_open(struct inode *inode, struct file *file) 156 { 157 return single_open(file, aoedisk_debugfs_show, inode->i_private); 158 } 159 160 static DEVICE_ATTR(state, 0444, aoedisk_show_state, NULL); 161 static DEVICE_ATTR(mac, 0444, aoedisk_show_mac, NULL); 162 static DEVICE_ATTR(netif, 0444, aoedisk_show_netif, NULL); 163 static struct device_attribute dev_attr_firmware_version = { 164 .attr = { .name = "firmware-version", .mode = 0444 }, 165 .show = aoedisk_show_fwver, 166 }; 167 static DEVICE_ATTR(payload, 0444, aoedisk_show_payload, NULL); 168 169 static struct attribute *aoe_attrs[] = { 170 &dev_attr_state.attr, 171 &dev_attr_mac.attr, 172 &dev_attr_netif.attr, 173 &dev_attr_firmware_version.attr, 174 &dev_attr_payload.attr, 175 NULL, 176 }; 177 178 static const struct attribute_group aoe_attr_group = { 179 .attrs = aoe_attrs, 180 }; 181 182 static const struct attribute_group *aoe_attr_groups[] = { 183 &aoe_attr_group, 184 NULL, 185 }; 186 187 static const struct file_operations aoe_debugfs_fops = { 188 .open = aoe_debugfs_open, 189 .read = seq_read, 190 .llseek = seq_lseek, 191 .release = single_release, 192 }; 193 194 static void 195 aoedisk_add_debugfs(struct aoedev *d) 196 { 197 char *p; 198 199 if (aoe_debugfs_dir == NULL) 200 return; 201 p = strchr(d->gd->disk_name, '/'); 202 if (p == NULL) 203 p = d->gd->disk_name; 204 else 205 p++; 206 BUG_ON(*p == '\0'); 207 d->debugfs = debugfs_create_file(p, 0444, aoe_debugfs_dir, d, 208 &aoe_debugfs_fops); 209 } 210 void 211 aoedisk_rm_debugfs(struct aoedev *d) 212 { 213 debugfs_remove(d->debugfs); 214 d->debugfs = NULL; 215 } 216 217 static int 218 aoeblk_open(struct block_device *bdev, fmode_t mode) 219 { 220 struct aoedev *d = bdev->bd_disk->private_data; 221 ulong flags; 222 223 if (!virt_addr_valid(d)) { 224 pr_crit("aoe: invalid device pointer in %s\n", 225 __func__); 226 WARN_ON(1); 227 return -ENODEV; 228 } 229 if (!(d->flags & DEVFL_UP) || d->flags & DEVFL_TKILL) 230 return -ENODEV; 231 232 mutex_lock(&aoeblk_mutex); 233 spin_lock_irqsave(&d->lock, flags); 234 if (d->flags & DEVFL_UP && !(d->flags & DEVFL_TKILL)) { 235 d->nopen++; 236 spin_unlock_irqrestore(&d->lock, flags); 237 mutex_unlock(&aoeblk_mutex); 238 return 0; 239 } 240 spin_unlock_irqrestore(&d->lock, flags); 241 mutex_unlock(&aoeblk_mutex); 242 return -ENODEV; 243 } 244 245 static void 246 aoeblk_release(struct gendisk *disk, fmode_t mode) 247 { 248 struct aoedev *d = disk->private_data; 249 ulong flags; 250 251 spin_lock_irqsave(&d->lock, flags); 252 253 if (--d->nopen == 0) { 254 spin_unlock_irqrestore(&d->lock, flags); 255 aoecmd_cfg(d->aoemajor, d->aoeminor); 256 return; 257 } 258 spin_unlock_irqrestore(&d->lock, flags); 259 } 260 261 static blk_status_t aoeblk_queue_rq(struct blk_mq_hw_ctx *hctx, 262 const struct blk_mq_queue_data *bd) 263 { 264 struct aoedev *d = hctx->queue->queuedata; 265 266 spin_lock_irq(&d->lock); 267 268 if ((d->flags & DEVFL_UP) == 0) { 269 pr_info_ratelimited("aoe: device %ld.%d is not up\n", 270 d->aoemajor, d->aoeminor); 271 spin_unlock_irq(&d->lock); 272 blk_mq_start_request(bd->rq); 273 return BLK_STS_IOERR; 274 } 275 276 list_add_tail(&bd->rq->queuelist, &d->rq_list); 277 aoecmd_work(d); 278 spin_unlock_irq(&d->lock); 279 return BLK_STS_OK; 280 } 281 282 static int 283 aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo) 284 { 285 struct aoedev *d = bdev->bd_disk->private_data; 286 287 if ((d->flags & DEVFL_UP) == 0) { 288 printk(KERN_ERR "aoe: disk not up\n"); 289 return -ENODEV; 290 } 291 292 geo->cylinders = d->geo.cylinders; 293 geo->heads = d->geo.heads; 294 geo->sectors = d->geo.sectors; 295 return 0; 296 } 297 298 static int 299 aoeblk_ioctl(struct block_device *bdev, fmode_t mode, uint cmd, ulong arg) 300 { 301 struct aoedev *d; 302 303 if (!arg) 304 return -EINVAL; 305 306 d = bdev->bd_disk->private_data; 307 if ((d->flags & DEVFL_UP) == 0) { 308 pr_err("aoe: disk not up\n"); 309 return -ENODEV; 310 } 311 312 if (cmd == HDIO_GET_IDENTITY) { 313 if (!copy_to_user((void __user *) arg, &d->ident, 314 sizeof(d->ident))) 315 return 0; 316 return -EFAULT; 317 } 318 319 /* udev calls scsi_id, which uses SG_IO, resulting in noise */ 320 if (cmd != SG_IO) 321 pr_info("aoe: unknown ioctl 0x%x\n", cmd); 322 323 return -ENOTTY; 324 } 325 326 static const struct block_device_operations aoe_bdops = { 327 .open = aoeblk_open, 328 .release = aoeblk_release, 329 .ioctl = aoeblk_ioctl, 330 .compat_ioctl = blkdev_compat_ptr_ioctl, 331 .getgeo = aoeblk_getgeo, 332 .owner = THIS_MODULE, 333 }; 334 335 static const struct blk_mq_ops aoeblk_mq_ops = { 336 .queue_rq = aoeblk_queue_rq, 337 }; 338 339 /* blk_mq_alloc_disk and add_disk can sleep */ 340 void 341 aoeblk_gdalloc(void *vp) 342 { 343 struct aoedev *d = vp; 344 struct gendisk *gd; 345 mempool_t *mp; 346 struct blk_mq_tag_set *set; 347 ulong flags; 348 int late = 0; 349 int err; 350 351 spin_lock_irqsave(&d->lock, flags); 352 if (d->flags & DEVFL_GDALLOC 353 && !(d->flags & DEVFL_TKILL) 354 && !(d->flags & DEVFL_GD_NOW)) 355 d->flags |= DEVFL_GD_NOW; 356 else 357 late = 1; 358 spin_unlock_irqrestore(&d->lock, flags); 359 if (late) 360 return; 361 362 mp = mempool_create(MIN_BUFS, mempool_alloc_slab, mempool_free_slab, 363 buf_pool_cache); 364 if (mp == NULL) { 365 printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n", 366 d->aoemajor, d->aoeminor); 367 goto err; 368 } 369 370 set = &d->tag_set; 371 set->ops = &aoeblk_mq_ops; 372 set->cmd_size = sizeof(struct aoe_req); 373 set->nr_hw_queues = 1; 374 set->queue_depth = 128; 375 set->numa_node = NUMA_NO_NODE; 376 set->flags = BLK_MQ_F_SHOULD_MERGE; 377 err = blk_mq_alloc_tag_set(set); 378 if (err) { 379 pr_err("aoe: cannot allocate tag set for %ld.%d\n", 380 d->aoemajor, d->aoeminor); 381 goto err_mempool; 382 } 383 384 gd = blk_mq_alloc_disk(set, d); 385 if (IS_ERR(gd)) { 386 pr_err("aoe: cannot allocate block queue for %ld.%d\n", 387 d->aoemajor, d->aoeminor); 388 goto err_tagset; 389 } 390 391 spin_lock_irqsave(&d->lock, flags); 392 WARN_ON(!(d->flags & DEVFL_GD_NOW)); 393 WARN_ON(!(d->flags & DEVFL_GDALLOC)); 394 WARN_ON(d->flags & DEVFL_TKILL); 395 WARN_ON(d->gd); 396 WARN_ON(d->flags & DEVFL_UP); 397 blk_queue_max_hw_sectors(gd->queue, BLK_DEF_MAX_SECTORS); 398 blk_queue_io_opt(gd->queue, SZ_2M); 399 d->bufpool = mp; 400 d->blkq = gd->queue; 401 d->gd = gd; 402 if (aoe_maxsectors) 403 blk_queue_max_hw_sectors(gd->queue, aoe_maxsectors); 404 gd->major = AOE_MAJOR; 405 gd->first_minor = d->sysminor; 406 gd->minors = AOE_PARTITIONS; 407 gd->fops = &aoe_bdops; 408 gd->private_data = d; 409 set_capacity(gd, d->ssize); 410 snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d", 411 d->aoemajor, d->aoeminor); 412 413 d->flags &= ~DEVFL_GDALLOC; 414 d->flags |= DEVFL_UP; 415 416 spin_unlock_irqrestore(&d->lock, flags); 417 418 err = device_add_disk(NULL, gd, aoe_attr_groups); 419 if (err) 420 goto out_disk_cleanup; 421 aoedisk_add_debugfs(d); 422 423 spin_lock_irqsave(&d->lock, flags); 424 WARN_ON(!(d->flags & DEVFL_GD_NOW)); 425 d->flags &= ~DEVFL_GD_NOW; 426 spin_unlock_irqrestore(&d->lock, flags); 427 return; 428 429 out_disk_cleanup: 430 blk_cleanup_disk(gd); 431 err_tagset: 432 blk_mq_free_tag_set(set); 433 err_mempool: 434 mempool_destroy(mp); 435 err: 436 spin_lock_irqsave(&d->lock, flags); 437 d->flags &= ~DEVFL_GD_NOW; 438 schedule_work(&d->work); 439 spin_unlock_irqrestore(&d->lock, flags); 440 } 441 442 void 443 aoeblk_exit(void) 444 { 445 debugfs_remove_recursive(aoe_debugfs_dir); 446 aoe_debugfs_dir = NULL; 447 kmem_cache_destroy(buf_pool_cache); 448 } 449 450 int __init 451 aoeblk_init(void) 452 { 453 buf_pool_cache = kmem_cache_create("aoe_bufs", 454 sizeof(struct buf), 455 0, 0, NULL); 456 if (buf_pool_cache == NULL) 457 return -ENOMEM; 458 aoe_debugfs_dir = debugfs_create_dir("aoe", NULL); 459 return 0; 460 } 461 462