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 /* random default picked from the historic block max_sectors cap */
28 static int aoe_maxsectors = 2560;
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
aoedisk_show_state(struct device * dev,struct device_attribute * attr,char * page)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 }
aoedisk_show_mac(struct device * dev,struct device_attribute * attr,char * page)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 }
aoedisk_show_netif(struct device * dev,struct device_attribute * attr,char * page)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 */
aoedisk_show_fwver(struct device * dev,struct device_attribute * attr,char * page)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 }
aoedisk_show_payload(struct device * dev,struct device_attribute * attr,char * page)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
aoe_debugfs_show(struct seq_file * s,void * ignored)111 static int aoe_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 DEFINE_SHOW_ATTRIBUTE(aoe_debugfs);
155
156 static DEVICE_ATTR(state, 0444, aoedisk_show_state, NULL);
157 static DEVICE_ATTR(mac, 0444, aoedisk_show_mac, NULL);
158 static DEVICE_ATTR(netif, 0444, aoedisk_show_netif, NULL);
159 static struct device_attribute dev_attr_firmware_version = {
160 .attr = { .name = "firmware-version", .mode = 0444 },
161 .show = aoedisk_show_fwver,
162 };
163 static DEVICE_ATTR(payload, 0444, aoedisk_show_payload, NULL);
164
165 static struct attribute *aoe_attrs[] = {
166 &dev_attr_state.attr,
167 &dev_attr_mac.attr,
168 &dev_attr_netif.attr,
169 &dev_attr_firmware_version.attr,
170 &dev_attr_payload.attr,
171 NULL,
172 };
173
174 static const struct attribute_group aoe_attr_group = {
175 .attrs = aoe_attrs,
176 };
177
178 static const struct attribute_group *aoe_attr_groups[] = {
179 &aoe_attr_group,
180 NULL,
181 };
182
183 static void
aoedisk_add_debugfs(struct aoedev * d)184 aoedisk_add_debugfs(struct aoedev *d)
185 {
186 char *p;
187
188 if (aoe_debugfs_dir == NULL)
189 return;
190 p = strchr(d->gd->disk_name, '/');
191 if (p == NULL)
192 p = d->gd->disk_name;
193 else
194 p++;
195 BUG_ON(*p == '\0');
196 d->debugfs = debugfs_create_file(p, 0444, aoe_debugfs_dir, d,
197 &aoe_debugfs_fops);
198 }
199 void
aoedisk_rm_debugfs(struct aoedev * d)200 aoedisk_rm_debugfs(struct aoedev *d)
201 {
202 debugfs_remove(d->debugfs);
203 d->debugfs = NULL;
204 }
205
206 static int
aoeblk_open(struct gendisk * disk,blk_mode_t mode)207 aoeblk_open(struct gendisk *disk, blk_mode_t mode)
208 {
209 struct aoedev *d = disk->private_data;
210 ulong flags;
211
212 if (!virt_addr_valid(d)) {
213 pr_crit("aoe: invalid device pointer in %s\n",
214 __func__);
215 WARN_ON(1);
216 return -ENODEV;
217 }
218 if (!(d->flags & DEVFL_UP) || d->flags & DEVFL_TKILL)
219 return -ENODEV;
220
221 mutex_lock(&aoeblk_mutex);
222 spin_lock_irqsave(&d->lock, flags);
223 if (d->flags & DEVFL_UP && !(d->flags & DEVFL_TKILL)) {
224 d->nopen++;
225 spin_unlock_irqrestore(&d->lock, flags);
226 mutex_unlock(&aoeblk_mutex);
227 return 0;
228 }
229 spin_unlock_irqrestore(&d->lock, flags);
230 mutex_unlock(&aoeblk_mutex);
231 return -ENODEV;
232 }
233
234 static void
aoeblk_release(struct gendisk * disk)235 aoeblk_release(struct gendisk *disk)
236 {
237 struct aoedev *d = disk->private_data;
238 ulong flags;
239
240 spin_lock_irqsave(&d->lock, flags);
241
242 if (--d->nopen == 0) {
243 spin_unlock_irqrestore(&d->lock, flags);
244 aoecmd_cfg(d->aoemajor, d->aoeminor);
245 return;
246 }
247 spin_unlock_irqrestore(&d->lock, flags);
248 }
249
aoeblk_queue_rq(struct blk_mq_hw_ctx * hctx,const struct blk_mq_queue_data * bd)250 static blk_status_t aoeblk_queue_rq(struct blk_mq_hw_ctx *hctx,
251 const struct blk_mq_queue_data *bd)
252 {
253 struct aoedev *d = hctx->queue->queuedata;
254
255 spin_lock_irq(&d->lock);
256
257 if ((d->flags & DEVFL_UP) == 0) {
258 pr_info_ratelimited("aoe: device %ld.%d is not up\n",
259 d->aoemajor, d->aoeminor);
260 spin_unlock_irq(&d->lock);
261 blk_mq_start_request(bd->rq);
262 return BLK_STS_IOERR;
263 }
264
265 list_add_tail(&bd->rq->queuelist, &d->rq_list);
266 aoecmd_work(d);
267 spin_unlock_irq(&d->lock);
268 return BLK_STS_OK;
269 }
270
271 static int
aoeblk_getgeo(struct block_device * bdev,struct hd_geometry * geo)272 aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
273 {
274 struct aoedev *d = bdev->bd_disk->private_data;
275
276 if ((d->flags & DEVFL_UP) == 0) {
277 printk(KERN_ERR "aoe: disk not up\n");
278 return -ENODEV;
279 }
280
281 geo->cylinders = d->geo.cylinders;
282 geo->heads = d->geo.heads;
283 geo->sectors = d->geo.sectors;
284 return 0;
285 }
286
287 static int
aoeblk_ioctl(struct block_device * bdev,blk_mode_t mode,uint cmd,ulong arg)288 aoeblk_ioctl(struct block_device *bdev, blk_mode_t mode, uint cmd, ulong arg)
289 {
290 struct aoedev *d;
291
292 if (!arg)
293 return -EINVAL;
294
295 d = bdev->bd_disk->private_data;
296 if ((d->flags & DEVFL_UP) == 0) {
297 pr_err("aoe: disk not up\n");
298 return -ENODEV;
299 }
300
301 if (cmd == HDIO_GET_IDENTITY) {
302 if (!copy_to_user((void __user *) arg, &d->ident,
303 sizeof(d->ident)))
304 return 0;
305 return -EFAULT;
306 }
307
308 /* udev calls scsi_id, which uses SG_IO, resulting in noise */
309 if (cmd != SG_IO)
310 pr_info("aoe: unknown ioctl 0x%x\n", cmd);
311
312 return -ENOTTY;
313 }
314
315 static const struct block_device_operations aoe_bdops = {
316 .open = aoeblk_open,
317 .release = aoeblk_release,
318 .ioctl = aoeblk_ioctl,
319 .compat_ioctl = blkdev_compat_ptr_ioctl,
320 .getgeo = aoeblk_getgeo,
321 .owner = THIS_MODULE,
322 };
323
324 static const struct blk_mq_ops aoeblk_mq_ops = {
325 .queue_rq = aoeblk_queue_rq,
326 };
327
328 /* blk_mq_alloc_disk and add_disk can sleep */
329 void
aoeblk_gdalloc(void * vp)330 aoeblk_gdalloc(void *vp)
331 {
332 struct aoedev *d = vp;
333 struct gendisk *gd;
334 mempool_t *mp;
335 struct blk_mq_tag_set *set;
336 sector_t ssize;
337 struct queue_limits lim = {
338 .max_hw_sectors = aoe_maxsectors,
339 .io_opt = SZ_2M,
340 .features = BLK_FEAT_ROTATIONAL,
341 };
342 ulong flags;
343 int late = 0;
344 int err;
345
346 spin_lock_irqsave(&d->lock, flags);
347 if (d->flags & DEVFL_GDALLOC
348 && !(d->flags & DEVFL_TKILL)
349 && !(d->flags & DEVFL_GD_NOW))
350 d->flags |= DEVFL_GD_NOW;
351 else
352 late = 1;
353 spin_unlock_irqrestore(&d->lock, flags);
354 if (late)
355 return;
356
357 mp = mempool_create(MIN_BUFS, mempool_alloc_slab, mempool_free_slab,
358 buf_pool_cache);
359 if (mp == NULL) {
360 printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n",
361 d->aoemajor, d->aoeminor);
362 goto err;
363 }
364
365 set = &d->tag_set;
366 set->ops = &aoeblk_mq_ops;
367 set->cmd_size = sizeof(struct aoe_req);
368 set->nr_hw_queues = 1;
369 set->queue_depth = 128;
370 set->numa_node = NUMA_NO_NODE;
371 set->flags = BLK_MQ_F_SHOULD_MERGE;
372 err = blk_mq_alloc_tag_set(set);
373 if (err) {
374 pr_err("aoe: cannot allocate tag set for %ld.%d\n",
375 d->aoemajor, d->aoeminor);
376 goto err_mempool;
377 }
378
379 gd = blk_mq_alloc_disk(set, &lim, d);
380 if (IS_ERR(gd)) {
381 pr_err("aoe: cannot allocate block queue for %ld.%d\n",
382 d->aoemajor, d->aoeminor);
383 goto err_tagset;
384 }
385
386 spin_lock_irqsave(&d->lock, flags);
387 WARN_ON(!(d->flags & DEVFL_GD_NOW));
388 WARN_ON(!(d->flags & DEVFL_GDALLOC));
389 WARN_ON(d->flags & DEVFL_TKILL);
390 WARN_ON(d->gd);
391 WARN_ON(d->flags & DEVFL_UP);
392 d->bufpool = mp;
393 d->blkq = gd->queue;
394 d->gd = gd;
395 gd->major = AOE_MAJOR;
396 gd->first_minor = d->sysminor;
397 gd->minors = AOE_PARTITIONS;
398 gd->fops = &aoe_bdops;
399 gd->private_data = d;
400 ssize = d->ssize;
401 snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d",
402 d->aoemajor, d->aoeminor);
403
404 d->flags &= ~DEVFL_GDALLOC;
405 d->flags |= DEVFL_UP;
406
407 spin_unlock_irqrestore(&d->lock, flags);
408
409 set_capacity(gd, ssize);
410
411 err = device_add_disk(NULL, gd, aoe_attr_groups);
412 if (err)
413 goto out_disk_cleanup;
414 aoedisk_add_debugfs(d);
415
416 spin_lock_irqsave(&d->lock, flags);
417 WARN_ON(!(d->flags & DEVFL_GD_NOW));
418 d->flags &= ~DEVFL_GD_NOW;
419 spin_unlock_irqrestore(&d->lock, flags);
420 return;
421
422 out_disk_cleanup:
423 put_disk(gd);
424 err_tagset:
425 blk_mq_free_tag_set(set);
426 err_mempool:
427 mempool_destroy(mp);
428 err:
429 spin_lock_irqsave(&d->lock, flags);
430 d->flags &= ~DEVFL_GD_NOW;
431 queue_work(aoe_wq, &d->work);
432 spin_unlock_irqrestore(&d->lock, flags);
433 }
434
435 void
aoeblk_exit(void)436 aoeblk_exit(void)
437 {
438 debugfs_remove_recursive(aoe_debugfs_dir);
439 aoe_debugfs_dir = NULL;
440 kmem_cache_destroy(buf_pool_cache);
441 }
442
443 int __init
aoeblk_init(void)444 aoeblk_init(void)
445 {
446 buf_pool_cache = kmem_cache_create("aoe_bufs",
447 sizeof(struct buf),
448 0, 0, NULL);
449 if (buf_pool_cache == NULL)
450 return -ENOMEM;
451 aoe_debugfs_dir = debugfs_create_dir("aoe", NULL);
452 return 0;
453 }
454
455