xref: /openbmc/linux/drivers/block/aoe/aoeblk.c (revision 78bb17f7) 
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 	enum { KB = 1024, MB = KB * KB, READ_AHEAD = 2 * MB, };
351 	ulong flags;
352 	int late = 0;
353 	int err;
354 
355 	spin_lock_irqsave(&d->lock, flags);
356 	if (d->flags & DEVFL_GDALLOC
357 	&& !(d->flags & DEVFL_TKILL)
358 	&& !(d->flags & DEVFL_GD_NOW))
359 		d->flags |= DEVFL_GD_NOW;
360 	else
361 		late = 1;
362 	spin_unlock_irqrestore(&d->lock, flags);
363 	if (late)
364 		return;
365 
366 	gd = alloc_disk(AOE_PARTITIONS);
367 	if (gd == NULL) {
368 		pr_err("aoe: cannot allocate disk structure for %ld.%d\n",
369 			d->aoemajor, d->aoeminor);
370 		goto err;
371 	}
372 
373 	mp = mempool_create(MIN_BUFS, mempool_alloc_slab, mempool_free_slab,
374 		buf_pool_cache);
375 	if (mp == NULL) {
376 		printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n",
377 			d->aoemajor, d->aoeminor);
378 		goto err_disk;
379 	}
380 
381 	set = &d->tag_set;
382 	set->ops = &aoeblk_mq_ops;
383 	set->cmd_size = sizeof(struct aoe_req);
384 	set->nr_hw_queues = 1;
385 	set->queue_depth = 128;
386 	set->numa_node = NUMA_NO_NODE;
387 	set->flags = BLK_MQ_F_SHOULD_MERGE;
388 	err = blk_mq_alloc_tag_set(set);
389 	if (err) {
390 		pr_err("aoe: cannot allocate tag set for %ld.%d\n",
391 			d->aoemajor, d->aoeminor);
392 		goto err_mempool;
393 	}
394 
395 	q = blk_mq_init_queue(set);
396 	if (IS_ERR(q)) {
397 		pr_err("aoe: cannot allocate block queue for %ld.%d\n",
398 			d->aoemajor, d->aoeminor);
399 		blk_mq_free_tag_set(set);
400 		goto err_mempool;
401 	}
402 
403 	spin_lock_irqsave(&d->lock, flags);
404 	WARN_ON(!(d->flags & DEVFL_GD_NOW));
405 	WARN_ON(!(d->flags & DEVFL_GDALLOC));
406 	WARN_ON(d->flags & DEVFL_TKILL);
407 	WARN_ON(d->gd);
408 	WARN_ON(d->flags & DEVFL_UP);
409 	blk_queue_max_hw_sectors(q, BLK_DEF_MAX_SECTORS);
410 	q->backing_dev_info->name = "aoe";
411 	q->backing_dev_info->ra_pages = READ_AHEAD / PAGE_SIZE;
412 	d->bufpool = mp;
413 	d->blkq = gd->queue = q;
414 	q->queuedata = d;
415 	d->gd = gd;
416 	if (aoe_maxsectors)
417 		blk_queue_max_hw_sectors(q, aoe_maxsectors);
418 	gd->major = AOE_MAJOR;
419 	gd->first_minor = d->sysminor;
420 	gd->fops = &aoe_bdops;
421 	gd->private_data = d;
422 	set_capacity(gd, d->ssize);
423 	snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d",
424 		d->aoemajor, d->aoeminor);
425 
426 	d->flags &= ~DEVFL_GDALLOC;
427 	d->flags |= DEVFL_UP;
428 
429 	spin_unlock_irqrestore(&d->lock, flags);
430 
431 	device_add_disk(NULL, gd, aoe_attr_groups);
432 	aoedisk_add_debugfs(d);
433 
434 	spin_lock_irqsave(&d->lock, flags);
435 	WARN_ON(!(d->flags & DEVFL_GD_NOW));
436 	d->flags &= ~DEVFL_GD_NOW;
437 	spin_unlock_irqrestore(&d->lock, flags);
438 	return;
439 
440 err_mempool:
441 	mempool_destroy(mp);
442 err_disk:
443 	put_disk(gd);
444 err:
445 	spin_lock_irqsave(&d->lock, flags);
446 	d->flags &= ~DEVFL_GD_NOW;
447 	schedule_work(&d->work);
448 	spin_unlock_irqrestore(&d->lock, flags);
449 }
450 
451 void
452 aoeblk_exit(void)
453 {
454 	debugfs_remove_recursive(aoe_debugfs_dir);
455 	aoe_debugfs_dir = NULL;
456 	kmem_cache_destroy(buf_pool_cache);
457 }
458 
459 int __init
460 aoeblk_init(void)
461 {
462 	buf_pool_cache = kmem_cache_create("aoe_bufs",
463 					   sizeof(struct buf),
464 					   0, 0, NULL);
465 	if (buf_pool_cache == NULL)
466 		return -ENOMEM;
467 	aoe_debugfs_dir = debugfs_create_dir("aoe", NULL);
468 	return 0;
469 }
470 
471