drivers/block/aoe/aoeblk.c

   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 += scnprintf(p, PAGE_SIZE - (p-page), "%s%s",
  91                         p == page ? "" : ",", (*nd)->name);
  92         p += scnprintf(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         char *p;
 200
 201         if (aoe_debugfs_dir == NULL)
 202                 return;
 203         p = strchr(d->gd->disk_name, '/');
 204         if (p == NULL)
 205                 p = d->gd->disk_name;
 206         else
 207                 p++;
 208         BUG_ON(*p == '\0');
 209         d->debugfs = debugfs_create_file(p, 0444, aoe_debugfs_dir, d,
 210                                          &aoe_debugfs_fops);
 211 }
 212 void
 213 aoedisk_rm_debugfs(struct aoedev *d)
 214 {
 215         debugfs_remove(d->debugfs);
 216         d->debugfs = NULL;
 217 }
 218
 219 static int
 220 aoeblk_open(struct block_device *bdev, fmode_t mode)
 221 {
 222         struct aoedev *d = bdev->bd_disk->private_data;
 223         ulong flags;
 224
 225         if (!virt_addr_valid(d)) {
 226                 pr_crit("aoe: invalid device pointer in %s\n",
 227                         __func__);
 228                 WARN_ON(1);
 229                 return -ENODEV;
 230         }
 231         if (!(d->flags & DEVFL_UP) || d->flags & DEVFL_TKILL)
 232                 return -ENODEV;
 233
 234         mutex_lock(&aoeblk_mutex);
 235         spin_lock_irqsave(&d->lock, flags);
 236         if (d->flags & DEVFL_UP && !(d->flags & DEVFL_TKILL)) {
 237                 d->nopen++;
 238                 spin_unlock_irqrestore(&d->lock, flags);
 239                 mutex_unlock(&aoeblk_mutex);
 240                 return 0;
 241         }
 242         spin_unlock_irqrestore(&d->lock, flags);
 243         mutex_unlock(&aoeblk_mutex);
 244         return -ENODEV;
 245 }
 246
 247 static void
 248 aoeblk_release(struct gendisk *disk, fmode_t mode)
 249 {
 250         struct aoedev *d = disk->private_data;
 251         ulong flags;
 252
 253         spin_lock_irqsave(&d->lock, flags);
 254
 255         if (--d->nopen == 0) {
 256                 spin_unlock_irqrestore(&d->lock, flags);
 257                 aoecmd_cfg(d->aoemajor, d->aoeminor);
 258                 return;
 259         }
 260         spin_unlock_irqrestore(&d->lock, flags);
 261 }
 262
 263 static blk_status_t aoeblk_queue_rq(struct blk_mq_hw_ctx *hctx,
 264                                     const struct blk_mq_queue_data *bd)
 265 {
 266         struct aoedev *d = hctx->queue->queuedata;
 267
 268         spin_lock_irq(&d->lock);
 269
 270         if ((d->flags & DEVFL_UP) == 0) {
 271                 pr_info_ratelimited("aoe: device %ld.%d is not up\n",
 272                         d->aoemajor, d->aoeminor);
 273                 spin_unlock_irq(&d->lock);
 274                 blk_mq_start_request(bd->rq);
 275                 return BLK_STS_IOERR;
 276         }
 277
 278         list_add_tail(&bd->rq->queuelist, &d->rq_list);
 279         aoecmd_work(d);
 280         spin_unlock_irq(&d->lock);
 281         return BLK_STS_OK;
 282 }
 283
 284 static int
 285 aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 286 {
 287         struct aoedev *d = bdev->bd_disk->private_data;
 288
 289         if ((d->flags & DEVFL_UP) == 0) {
 290                 printk(KERN_ERR "aoe: disk not up\n");
 291                 return -ENODEV;
 292         }
 293
 294         geo->cylinders = d->geo.cylinders;
 295         geo->heads = d->geo.heads;
 296         geo->sectors = d->geo.sectors;
 297         return 0;
 298 }
 299
 300 static int
 301 aoeblk_ioctl(struct block_device *bdev, fmode_t mode, uint cmd, ulong arg)
 302 {
 303         struct aoedev *d;
 304
 305         if (!arg)
 306                 return -EINVAL;
 307
 308         d = bdev->bd_disk->private_data;
 309         if ((d->flags & DEVFL_UP) == 0) {
 310                 pr_err("aoe: disk not up\n");
 311                 return -ENODEV;
 312         }
 313
 314         if (cmd == HDIO_GET_IDENTITY) {
 315                 if (!copy_to_user((void __user *) arg, &d->ident,
 316                         sizeof(d->ident)))
 317                         return 0;
 318                 return -EFAULT;
 319         }
 320
 321         /* udev calls scsi_id, which uses SG_IO, resulting in noise */
 322         if (cmd != SG_IO)
 323                 pr_info("aoe: unknown ioctl 0x%x\n", cmd);
 324
 325         return -ENOTTY;
 326 }
 327
 328 static const struct block_device_operations aoe_bdops = {
 329         .open = aoeblk_open,
 330         .release = aoeblk_release,
 331         .ioctl = aoeblk_ioctl,
 332         .compat_ioctl = blkdev_compat_ptr_ioctl,
 333         .getgeo = aoeblk_getgeo,
 334         .owner = THIS_MODULE,
 335 };
 336
 337 static const struct blk_mq_ops aoeblk_mq_ops = {
 338         .queue_rq       = aoeblk_queue_rq,
 339 };
 340
 341 /* alloc_disk and add_disk can sleep */
 342 void
 343 aoeblk_gdalloc(void *vp)
 344 {
 345         struct aoedev *d = vp;
 346         struct gendisk *gd;
 347         mempool_t *mp;
 348         struct request_queue *q;
 349         struct blk_mq_tag_set *set;
 350         ulong flags;
 351         int late = 0;
 352         int err;
 353
 354         spin_lock_irqsave(&d->lock, flags);
 355         if (d->flags & DEVFL_GDALLOC
 356         && !(d->flags & DEVFL_TKILL)
 357         && !(d->flags & DEVFL_GD_NOW))
 358                 d->flags |= DEVFL_GD_NOW;
 359         else
 360                 late = 1;
 361         spin_unlock_irqrestore(&d->lock, flags);
 362         if (late)
 363                 return;
 364
 365         gd = alloc_disk(AOE_PARTITIONS);
 366         if (gd == NULL) {
 367                 pr_err("aoe: cannot allocate disk structure for %ld.%d\n",
 368                         d->aoemajor, d->aoeminor);
 369                 goto err;
 370         }
 371
 372         mp = mempool_create(MIN_BUFS, mempool_alloc_slab, mempool_free_slab,
 373                 buf_pool_cache);
 374         if (mp == NULL) {
 375                 printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n",
 376                         d->aoemajor, d->aoeminor);
 377                 goto err_disk;
 378         }
 379
 380         set = &d->tag_set;
 381         set->ops = &aoeblk_mq_ops;
 382         set->cmd_size = sizeof(struct aoe_req);
 383         set->nr_hw_queues = 1;
 384         set->queue_depth = 128;
 385         set->numa_node = NUMA_NO_NODE;
 386         set->flags = BLK_MQ_F_SHOULD_MERGE;
 387         err = blk_mq_alloc_tag_set(set);
 388         if (err) {
 389                 pr_err("aoe: cannot allocate tag set for %ld.%d\n",
 390                         d->aoemajor, d->aoeminor);
 391                 goto err_mempool;
 392         }
 393
 394         q = blk_mq_init_queue(set);
 395         if (IS_ERR(q)) {
 396                 pr_err("aoe: cannot allocate block queue for %ld.%d\n",
 397                         d->aoemajor, d->aoeminor);
 398                 blk_mq_free_tag_set(set);
 399                 goto err_mempool;
 400         }
 401
 402         spin_lock_irqsave(&d->lock, flags);
 403         WARN_ON(!(d->flags & DEVFL_GD_NOW));
 404         WARN_ON(!(d->flags & DEVFL_GDALLOC));
 405         WARN_ON(d->flags & DEVFL_TKILL);
 406         WARN_ON(d->gd);
 407         WARN_ON(d->flags & DEVFL_UP);
 408         blk_queue_max_hw_sectors(q, BLK_DEF_MAX_SECTORS);
 409         blk_queue_io_opt(q, SZ_2M);
 410         d->bufpool = mp;
 411         d->blkq = gd->queue = q;
 412         q->queuedata = d;
 413         d->gd = gd;
 414         if (aoe_maxsectors)
 415                 blk_queue_max_hw_sectors(q, aoe_maxsectors);
 416         gd->major = AOE_MAJOR;
 417         gd->first_minor = d->sysminor;
 418         gd->fops = &aoe_bdops;
 419         gd->private_data = d;
 420         set_capacity(gd, d->ssize);
 421         snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d",
 422                 d->aoemajor, d->aoeminor);
 423
 424         d->flags &= ~DEVFL_GDALLOC;
 425         d->flags |= DEVFL_UP;
 426
 427         spin_unlock_irqrestore(&d->lock, flags);
 428
 429         device_add_disk(NULL, gd, aoe_attr_groups);
 430         aoedisk_add_debugfs(d);
 431
 432         spin_lock_irqsave(&d->lock, flags);
 433         WARN_ON(!(d->flags & DEVFL_GD_NOW));
 434         d->flags &= ~DEVFL_GD_NOW;
 435         spin_unlock_irqrestore(&d->lock, flags);
 436         return;
 437
 438 err_mempool:
 439         mempool_destroy(mp);
 440 err_disk:
 441         put_disk(gd);
 442 err:
 443         spin_lock_irqsave(&d->lock, flags);
 444         d->flags &= ~DEVFL_GD_NOW;
 445         schedule_work(&d->work);
 446         spin_unlock_irqrestore(&d->lock, flags);
 447 }
 448
 449 void
 450 aoeblk_exit(void)
 451 {
 452         debugfs_remove_recursive(aoe_debugfs_dir);
 453         aoe_debugfs_dir = NULL;
 454         kmem_cache_destroy(buf_pool_cache);
 455 }
 456
 457 int __init
 458 aoeblk_init(void)
 459 {
 460         buf_pool_cache = kmem_cache_create("aoe_bufs",
 461                                            sizeof(struct buf),
 462                                            0, 0, NULL);
 463         if (buf_pool_cache == NULL)
 464                 return -ENOMEM;
 465         aoe_debugfs_dir = debugfs_create_dir("aoe", NULL);
 466         return 0;
 467 }
 468