linux/drivers/block/aoe/aoeblk.c
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   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
  24static DEFINE_MUTEX(aoeblk_mutex);
  25static struct kmem_cache *buf_pool_cache;
  26static struct dentry *aoe_debugfs_dir;
  27
  28/* GPFS needs a larger value than the default. */
  29static int aoe_maxsectors;
  30module_param(aoe_maxsectors, int, 0644);
  31MODULE_PARM_DESC(aoe_maxsectors,
  32        "When nonzero, set the maximum number of sectors per I/O request");
  33
  34static 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}
  47static 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}
  58static 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 */
  96static 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}
 104static 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
 113static 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
 157static int aoe_debugfs_open(struct inode *inode, struct file *file)
 158{
 159        return single_open(file, aoedisk_debugfs_show, inode->i_private);
 160}
 161
 162static DEVICE_ATTR(state, 0444, aoedisk_show_state, NULL);
 163static DEVICE_ATTR(mac, 0444, aoedisk_show_mac, NULL);
 164static DEVICE_ATTR(netif, 0444, aoedisk_show_netif, NULL);
 165static struct device_attribute dev_attr_firmware_version = {
 166        .attr = { .name = "firmware-version", .mode = 0444 },
 167        .show = aoedisk_show_fwver,
 168};
 169static DEVICE_ATTR(payload, 0444, aoedisk_show_payload, NULL);
 170
 171static 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
 180static const struct attribute_group aoe_attr_group = {
 181        .attrs = aoe_attrs,
 182};
 183
 184static const struct attribute_group *aoe_attr_groups[] = {
 185        &aoe_attr_group,
 186        NULL,
 187};
 188
 189static 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
 196static void
 197aoedisk_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}
 212void
 213aoedisk_rm_debugfs(struct aoedev *d)
 214{
 215        debugfs_remove(d->debugfs);
 216        d->debugfs = NULL;
 217}
 218
 219static int
 220aoeblk_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
 247static void
 248aoeblk_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
 263static 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
 284static int
 285aoeblk_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
 300static int
 301aoeblk_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
 328static 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
 337static const struct blk_mq_ops aoeblk_mq_ops = {
 338        .queue_rq       = aoeblk_queue_rq,
 339};
 340
 341/* alloc_disk and add_disk can sleep */
 342void
 343aoeblk_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
 438err_mempool:
 439        mempool_destroy(mp);
 440err_disk:
 441        put_disk(gd);
 442err:
 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
 449void
 450aoeblk_exit(void)
 451{
 452        debugfs_remove_recursive(aoe_debugfs_dir);
 453        aoe_debugfs_dir = NULL;
 454        kmem_cache_destroy(buf_pool_cache);
 455}
 456
 457int __init
 458aoeblk_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
 469