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7#include <linux/kernel.h>
8#include <linux/hdreg.h>
9#include <linux/blkdev.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
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
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 += snprintf(p, PAGE_SIZE - (p-page), "%s%s",
91 p == page ? "" : ",", (*nd)->name);
92 p += snprintf(p, PAGE_SIZE - (p-page), "\n");
93 return p-page;
94}
95
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, S_IRUGO, aoedisk_show_state, NULL);
163static DEVICE_ATTR(mac, S_IRUGO, aoedisk_show_mac, NULL);
164static DEVICE_ATTR(netif, S_IRUGO, aoedisk_show_netif, NULL);
165static struct device_attribute dev_attr_firmware_version = {
166 .attr = { .name = "firmware-version", .mode = S_IRUGO },
167 .show = aoedisk_show_fwver,
168};
169static DEVICE_ATTR(payload, S_IRUGO, 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 attr_group = {
181 .attrs = aoe_attrs,
182};
183
184static const struct file_operations aoe_debugfs_fops = {
185 .open = aoe_debugfs_open,
186 .read = seq_read,
187 .llseek = seq_lseek,
188 .release = single_release,
189};
190
191static void
192aoedisk_add_debugfs(struct aoedev *d)
193{
194 struct dentry *entry;
195 char *p;
196
197 if (aoe_debugfs_dir == NULL)
198 return;
199 p = strchr(d->gd->disk_name, '/');
200 if (p == NULL)
201 p = d->gd->disk_name;
202 else
203 p++;
204 BUG_ON(*p == '\0');
205 entry = debugfs_create_file(p, 0444, aoe_debugfs_dir, d,
206 &aoe_debugfs_fops);
207 if (IS_ERR_OR_NULL(entry)) {
208 pr_info("aoe: cannot create debugfs file for %s\n",
209 d->gd->disk_name);
210 return;
211 }
212 BUG_ON(d->debugfs);
213 d->debugfs = entry;
214}
215void
216aoedisk_rm_debugfs(struct aoedev *d)
217{
218 debugfs_remove(d->debugfs);
219 d->debugfs = NULL;
220}
221
222static int
223aoedisk_add_sysfs(struct aoedev *d)
224{
225 return sysfs_create_group(&disk_to_dev(d->gd)->kobj, &attr_group);
226}
227void
228aoedisk_rm_sysfs(struct aoedev *d)
229{
230 sysfs_remove_group(&disk_to_dev(d->gd)->kobj, &attr_group);
231}
232
233static int
234aoeblk_open(struct block_device *bdev, fmode_t mode)
235{
236 struct aoedev *d = bdev->bd_disk->private_data;
237 ulong flags;
238
239 if (!virt_addr_valid(d)) {
240 pr_crit("aoe: invalid device pointer in %s\n",
241 __func__);
242 WARN_ON(1);
243 return -ENODEV;
244 }
245 if (!(d->flags & DEVFL_UP) || d->flags & DEVFL_TKILL)
246 return -ENODEV;
247
248 mutex_lock(&aoeblk_mutex);
249 spin_lock_irqsave(&d->lock, flags);
250 if (d->flags & DEVFL_UP && !(d->flags & DEVFL_TKILL)) {
251 d->nopen++;
252 spin_unlock_irqrestore(&d->lock, flags);
253 mutex_unlock(&aoeblk_mutex);
254 return 0;
255 }
256 spin_unlock_irqrestore(&d->lock, flags);
257 mutex_unlock(&aoeblk_mutex);
258 return -ENODEV;
259}
260
261static void
262aoeblk_release(struct gendisk *disk, fmode_t mode)
263{
264 struct aoedev *d = disk->private_data;
265 ulong flags;
266
267 spin_lock_irqsave(&d->lock, flags);
268
269 if (--d->nopen == 0) {
270 spin_unlock_irqrestore(&d->lock, flags);
271 aoecmd_cfg(d->aoemajor, d->aoeminor);
272 return;
273 }
274 spin_unlock_irqrestore(&d->lock, flags);
275}
276
277static void
278aoeblk_request(struct request_queue *q)
279{
280 struct aoedev *d;
281 struct request *rq;
282
283 d = q->queuedata;
284 if ((d->flags & DEVFL_UP) == 0) {
285 pr_info_ratelimited("aoe: device %ld.%d is not up\n",
286 d->aoemajor, d->aoeminor);
287 while ((rq = blk_peek_request(q))) {
288 blk_start_request(rq);
289 aoe_end_request(d, rq, 1);
290 }
291 return;
292 }
293 aoecmd_work(d);
294}
295
296static int
297aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
298{
299 struct aoedev *d = bdev->bd_disk->private_data;
300
301 if ((d->flags & DEVFL_UP) == 0) {
302 printk(KERN_ERR "aoe: disk not up\n");
303 return -ENODEV;
304 }
305
306 geo->cylinders = d->geo.cylinders;
307 geo->heads = d->geo.heads;
308 geo->sectors = d->geo.sectors;
309 return 0;
310}
311
312static int
313aoeblk_ioctl(struct block_device *bdev, fmode_t mode, uint cmd, ulong arg)
314{
315 struct aoedev *d;
316
317 if (!arg)
318 return -EINVAL;
319
320 d = bdev->bd_disk->private_data;
321 if ((d->flags & DEVFL_UP) == 0) {
322 pr_err("aoe: disk not up\n");
323 return -ENODEV;
324 }
325
326 if (cmd == HDIO_GET_IDENTITY) {
327 if (!copy_to_user((void __user *) arg, &d->ident,
328 sizeof(d->ident)))
329 return 0;
330 return -EFAULT;
331 }
332
333
334 if (cmd != SG_IO)
335 pr_info("aoe: unknown ioctl 0x%x\n", cmd);
336
337 return -ENOTTY;
338}
339
340static const struct block_device_operations aoe_bdops = {
341 .open = aoeblk_open,
342 .release = aoeblk_release,
343 .ioctl = aoeblk_ioctl,
344 .getgeo = aoeblk_getgeo,
345 .owner = THIS_MODULE,
346};
347
348
349void
350aoeblk_gdalloc(void *vp)
351{
352 struct aoedev *d = vp;
353 struct gendisk *gd;
354 mempool_t *mp;
355 struct request_queue *q;
356 enum { KB = 1024, MB = KB * KB, READ_AHEAD = 2 * MB, };
357 ulong flags;
358 int late = 0;
359
360 spin_lock_irqsave(&d->lock, flags);
361 if (d->flags & DEVFL_GDALLOC
362 && !(d->flags & DEVFL_TKILL)
363 && !(d->flags & DEVFL_GD_NOW))
364 d->flags |= DEVFL_GD_NOW;
365 else
366 late = 1;
367 spin_unlock_irqrestore(&d->lock, flags);
368 if (late)
369 return;
370
371 gd = alloc_disk(AOE_PARTITIONS);
372 if (gd == NULL) {
373 pr_err("aoe: cannot allocate disk structure for %ld.%d\n",
374 d->aoemajor, d->aoeminor);
375 goto err;
376 }
377
378 mp = mempool_create(MIN_BUFS, mempool_alloc_slab, mempool_free_slab,
379 buf_pool_cache);
380 if (mp == NULL) {
381 printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n",
382 d->aoemajor, d->aoeminor);
383 goto err_disk;
384 }
385 q = blk_init_queue(aoeblk_request, &d->lock);
386 if (q == NULL) {
387 pr_err("aoe: cannot allocate block queue for %ld.%d\n",
388 d->aoemajor, d->aoeminor);
389 goto err_mempool;
390 }
391 blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH);
392
393 spin_lock_irqsave(&d->lock, flags);
394 WARN_ON(!(d->flags & DEVFL_GD_NOW));
395 WARN_ON(!(d->flags & DEVFL_GDALLOC));
396 WARN_ON(d->flags & DEVFL_TKILL);
397 WARN_ON(d->gd);
398 WARN_ON(d->flags & DEVFL_UP);
399 blk_queue_max_hw_sectors(q, BLK_DEF_MAX_SECTORS);
400 q->backing_dev_info->name = "aoe";
401 q->backing_dev_info->ra_pages = READ_AHEAD / PAGE_SIZE;
402 d->bufpool = mp;
403 d->blkq = gd->queue = q;
404 q->queuedata = d;
405 d->gd = gd;
406 if (aoe_maxsectors)
407 blk_queue_max_hw_sectors(q, aoe_maxsectors);
408 gd->major = AOE_MAJOR;
409 gd->first_minor = d->sysminor;
410 gd->fops = &aoe_bdops;
411 gd->private_data = d;
412 set_capacity(gd, d->ssize);
413 snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d",
414 d->aoemajor, d->aoeminor);
415
416 d->flags &= ~DEVFL_GDALLOC;
417 d->flags |= DEVFL_UP;
418
419 spin_unlock_irqrestore(&d->lock, flags);
420
421 add_disk(gd);
422 aoedisk_add_sysfs(d);
423 aoedisk_add_debugfs(d);
424
425 spin_lock_irqsave(&d->lock, flags);
426 WARN_ON(!(d->flags & DEVFL_GD_NOW));
427 d->flags &= ~DEVFL_GD_NOW;
428 spin_unlock_irqrestore(&d->lock, flags);
429 return;
430
431err_mempool:
432 mempool_destroy(mp);
433err_disk:
434 put_disk(gd);
435err:
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
442void
443aoeblk_exit(void)
444{
445 debugfs_remove_recursive(aoe_debugfs_dir);
446 aoe_debugfs_dir = NULL;
447 kmem_cache_destroy(buf_pool_cache);
448}
449
450int __init
451aoeblk_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 if (IS_ERR_OR_NULL(aoe_debugfs_dir)) {
460 pr_info("aoe: cannot create debugfs directory\n");
461 aoe_debugfs_dir = NULL;
462 }
463 return 0;
464}
465
466
