ps3disk: simplify request completion
[linux-2.6.git] / drivers / block / ps3disk.c
1 /*
2  * PS3 Disk Storage Driver
3  *
4  * Copyright (C) 2007 Sony Computer Entertainment Inc.
5  * Copyright 2007 Sony Corp.
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License as published
9  * by the Free Software Foundation; version 2 of the License.
10  *
11  * This program is distributed in the hope that it will be useful, but
12  * WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License along
17  * with this program; if not, write to the Free Software Foundation, Inc.,
18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19  */
20
21 #include <linux/ata.h>
22 #include <linux/blkdev.h>
23
24 #include <asm/lv1call.h>
25 #include <asm/ps3stor.h>
26 #include <asm/firmware.h>
27
28
29 #define DEVICE_NAME             "ps3disk"
30
31 #define BOUNCE_SIZE             (64*1024)
32
33 #define PS3DISK_MAX_DISKS       16
34 #define PS3DISK_MINORS          16
35
36
37 #define PS3DISK_NAME            "ps3d%c"
38
39
40 struct ps3disk_private {
41         spinlock_t lock;                /* Request queue spinlock */
42         struct request_queue *queue;
43         struct gendisk *gendisk;
44         unsigned int blocking_factor;
45         struct request *req;
46         u64 raw_capacity;
47         unsigned char model[ATA_ID_PROD_LEN+1];
48 };
49
50
51 #define LV1_STORAGE_SEND_ATA_COMMAND    (2)
52 #define LV1_STORAGE_ATA_HDDOUT          (0x23)
53
54 struct lv1_ata_cmnd_block {
55         u16     features;
56         u16     sector_count;
57         u16     LBA_low;
58         u16     LBA_mid;
59         u16     LBA_high;
60         u8      device;
61         u8      command;
62         u32     is_ext;
63         u32     proto;
64         u32     in_out;
65         u32     size;
66         u64     buffer;
67         u32     arglen;
68 };
69
70 enum lv1_ata_proto {
71         NON_DATA_PROTO     = 0,
72         PIO_DATA_IN_PROTO  = 1,
73         PIO_DATA_OUT_PROTO = 2,
74         DMA_PROTO = 3
75 };
76
77 enum lv1_ata_in_out {
78         DIR_WRITE = 0,                  /* memory -> device */
79         DIR_READ = 1                    /* device -> memory */
80 };
81
82 static int ps3disk_major;
83
84
85 static struct block_device_operations ps3disk_fops = {
86         .owner          = THIS_MODULE,
87 };
88
89
90 static void ps3disk_scatter_gather(struct ps3_storage_device *dev,
91                                    struct request *req, int gather)
92 {
93         unsigned int offset = 0;
94         struct req_iterator iter;
95         struct bio_vec *bvec;
96         unsigned int i = 0;
97         size_t size;
98         void *buf;
99
100         rq_for_each_segment(bvec, req, iter) {
101                 unsigned long flags;
102                 dev_dbg(&dev->sbd.core,
103                         "%s:%u: bio %u: %u segs %u sectors from %lu\n",
104                         __func__, __LINE__, i, bio_segments(iter.bio),
105                         bio_sectors(iter.bio), iter.bio->bi_sector);
106
107                 size = bvec->bv_len;
108                 buf = bvec_kmap_irq(bvec, &flags);
109                 if (gather)
110                         memcpy(dev->bounce_buf+offset, buf, size);
111                 else
112                         memcpy(buf, dev->bounce_buf+offset, size);
113                 offset += size;
114                 flush_kernel_dcache_page(bvec->bv_page);
115                 bvec_kunmap_irq(bvec, &flags);
116                 i++;
117         }
118 }
119
120 static int ps3disk_submit_request_sg(struct ps3_storage_device *dev,
121                                      struct request *req)
122 {
123         struct ps3disk_private *priv = dev->sbd.core.driver_data;
124         int write = rq_data_dir(req), res;
125         const char *op = write ? "write" : "read";
126         u64 start_sector, sectors;
127         unsigned int region_id = dev->regions[dev->region_idx].id;
128
129 #ifdef DEBUG
130         unsigned int n = 0;
131         struct bio_vec *bv;
132         struct req_iterator iter;
133
134         rq_for_each_segment(bv, req, iter)
135                 n++;
136         dev_dbg(&dev->sbd.core,
137                 "%s:%u: %s req has %u bvecs for %lu sectors %lu hard sectors\n",
138                 __func__, __LINE__, op, n, req->nr_sectors,
139                 req->hard_nr_sectors);
140 #endif
141
142         start_sector = req->sector * priv->blocking_factor;
143         sectors = req->nr_sectors * priv->blocking_factor;
144         dev_dbg(&dev->sbd.core, "%s:%u: %s %llu sectors starting at %llu\n",
145                 __func__, __LINE__, op, sectors, start_sector);
146
147         if (write) {
148                 ps3disk_scatter_gather(dev, req, 1);
149
150                 res = lv1_storage_write(dev->sbd.dev_id, region_id,
151                                         start_sector, sectors, 0,
152                                         dev->bounce_lpar, &dev->tag);
153         } else {
154                 res = lv1_storage_read(dev->sbd.dev_id, region_id,
155                                        start_sector, sectors, 0,
156                                        dev->bounce_lpar, &dev->tag);
157         }
158         if (res) {
159                 dev_err(&dev->sbd.core, "%s:%u: %s failed %d\n", __func__,
160                         __LINE__, op, res);
161                 __blk_end_request_cur(req, -EIO);
162                 return 0;
163         }
164
165         priv->req = req;
166         return 1;
167 }
168
169 static int ps3disk_submit_flush_request(struct ps3_storage_device *dev,
170                                         struct request *req)
171 {
172         struct ps3disk_private *priv = dev->sbd.core.driver_data;
173         u64 res;
174
175         dev_dbg(&dev->sbd.core, "%s:%u: flush request\n", __func__, __LINE__);
176
177         res = lv1_storage_send_device_command(dev->sbd.dev_id,
178                                               LV1_STORAGE_ATA_HDDOUT, 0, 0, 0,
179                                               0, &dev->tag);
180         if (res) {
181                 dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
182                         __func__, __LINE__, res);
183                 __blk_end_request_cur(req, -EIO);
184                 return 0;
185         }
186
187         priv->req = req;
188         return 1;
189 }
190
191 static void ps3disk_do_request(struct ps3_storage_device *dev,
192                                struct request_queue *q)
193 {
194         struct request *req;
195
196         dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
197
198         while ((req = elv_next_request(q))) {
199                 if (blk_fs_request(req)) {
200                         if (ps3disk_submit_request_sg(dev, req))
201                                 break;
202                 } else if (req->cmd_type == REQ_TYPE_LINUX_BLOCK &&
203                            req->cmd[0] == REQ_LB_OP_FLUSH) {
204                         if (ps3disk_submit_flush_request(dev, req))
205                                 break;
206                 } else {
207                         blk_dump_rq_flags(req, DEVICE_NAME " bad request");
208                         __blk_end_request_cur(req, -EIO);
209                         continue;
210                 }
211         }
212 }
213
214 static void ps3disk_request(struct request_queue *q)
215 {
216         struct ps3_storage_device *dev = q->queuedata;
217         struct ps3disk_private *priv = dev->sbd.core.driver_data;
218
219         if (priv->req) {
220                 dev_dbg(&dev->sbd.core, "%s:%u busy\n", __func__, __LINE__);
221                 return;
222         }
223
224         ps3disk_do_request(dev, q);
225 }
226
227 static irqreturn_t ps3disk_interrupt(int irq, void *data)
228 {
229         struct ps3_storage_device *dev = data;
230         struct ps3disk_private *priv;
231         struct request *req;
232         int res, read, error;
233         u64 tag, status;
234         const char *op;
235
236         res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
237
238         if (tag != dev->tag)
239                 dev_err(&dev->sbd.core,
240                         "%s:%u: tag mismatch, got %llx, expected %llx\n",
241                         __func__, __LINE__, tag, dev->tag);
242
243         if (res) {
244                 dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
245                         __func__, __LINE__, res, status);
246                 return IRQ_HANDLED;
247         }
248
249         priv = dev->sbd.core.driver_data;
250         req = priv->req;
251         if (!req) {
252                 dev_dbg(&dev->sbd.core,
253                         "%s:%u non-block layer request completed\n", __func__,
254                         __LINE__);
255                 dev->lv1_status = status;
256                 complete(&dev->done);
257                 return IRQ_HANDLED;
258         }
259
260         if (req->cmd_type == REQ_TYPE_LINUX_BLOCK &&
261             req->cmd[0] == REQ_LB_OP_FLUSH) {
262                 read = 0;
263                 op = "flush";
264         } else {
265                 read = !rq_data_dir(req);
266                 op = read ? "read" : "write";
267         }
268         if (status) {
269                 dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__,
270                         __LINE__, op, status);
271                 error = -EIO;
272         } else {
273                 dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__,
274                         __LINE__, op);
275                 error = 0;
276                 if (read)
277                         ps3disk_scatter_gather(dev, req, 0);
278         }
279
280         spin_lock(&priv->lock);
281         __blk_end_request_all(req, error);
282         priv->req = NULL;
283         ps3disk_do_request(dev, priv->queue);
284         spin_unlock(&priv->lock);
285
286         return IRQ_HANDLED;
287 }
288
289 static int ps3disk_sync_cache(struct ps3_storage_device *dev)
290 {
291         u64 res;
292
293         dev_dbg(&dev->sbd.core, "%s:%u: sync cache\n", __func__, __LINE__);
294
295         res = ps3stor_send_command(dev, LV1_STORAGE_ATA_HDDOUT, 0, 0, 0, 0);
296         if (res) {
297                 dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
298                         __func__, __LINE__, res);
299                 return -EIO;
300         }
301         return 0;
302 }
303
304
305 /* ATA helpers copied from drivers/ata/libata-core.c */
306
307 static void swap_buf_le16(u16 *buf, unsigned int buf_words)
308 {
309 #ifdef __BIG_ENDIAN
310         unsigned int i;
311
312         for (i = 0; i < buf_words; i++)
313                 buf[i] = le16_to_cpu(buf[i]);
314 #endif /* __BIG_ENDIAN */
315 }
316
317 static u64 ata_id_n_sectors(const u16 *id)
318 {
319         if (ata_id_has_lba(id)) {
320                 if (ata_id_has_lba48(id))
321                         return ata_id_u64(id, 100);
322                 else
323                         return ata_id_u32(id, 60);
324         } else {
325                 if (ata_id_current_chs_valid(id))
326                         return ata_id_u32(id, 57);
327                 else
328                         return id[1] * id[3] * id[6];
329         }
330 }
331
332 static void ata_id_string(const u16 *id, unsigned char *s, unsigned int ofs,
333                           unsigned int len)
334 {
335         unsigned int c;
336
337         while (len > 0) {
338                 c = id[ofs] >> 8;
339                 *s = c;
340                 s++;
341
342                 c = id[ofs] & 0xff;
343                 *s = c;
344                 s++;
345
346                 ofs++;
347                 len -= 2;
348         }
349 }
350
351 static void ata_id_c_string(const u16 *id, unsigned char *s, unsigned int ofs,
352                             unsigned int len)
353 {
354         unsigned char *p;
355
356         WARN_ON(!(len & 1));
357
358         ata_id_string(id, s, ofs, len - 1);
359
360         p = s + strnlen(s, len - 1);
361         while (p > s && p[-1] == ' ')
362                 p--;
363         *p = '\0';
364 }
365
366 static int ps3disk_identify(struct ps3_storage_device *dev)
367 {
368         struct ps3disk_private *priv = dev->sbd.core.driver_data;
369         struct lv1_ata_cmnd_block ata_cmnd;
370         u16 *id = dev->bounce_buf;
371         u64 res;
372
373         dev_dbg(&dev->sbd.core, "%s:%u: identify disk\n", __func__, __LINE__);
374
375         memset(&ata_cmnd, 0, sizeof(struct lv1_ata_cmnd_block));
376         ata_cmnd.command = ATA_CMD_ID_ATA;
377         ata_cmnd.sector_count = 1;
378         ata_cmnd.size = ata_cmnd.arglen = ATA_ID_WORDS * 2;
379         ata_cmnd.buffer = dev->bounce_lpar;
380         ata_cmnd.proto = PIO_DATA_IN_PROTO;
381         ata_cmnd.in_out = DIR_READ;
382
383         res = ps3stor_send_command(dev, LV1_STORAGE_SEND_ATA_COMMAND,
384                                    ps3_mm_phys_to_lpar(__pa(&ata_cmnd)),
385                                    sizeof(ata_cmnd), ata_cmnd.buffer,
386                                    ata_cmnd.arglen);
387         if (res) {
388                 dev_err(&dev->sbd.core, "%s:%u: identify disk failed 0x%llx\n",
389                         __func__, __LINE__, res);
390                 return -EIO;
391         }
392
393         swap_buf_le16(id, ATA_ID_WORDS);
394
395         /* All we're interested in are raw capacity and model name */
396         priv->raw_capacity = ata_id_n_sectors(id);
397         ata_id_c_string(id, priv->model, ATA_ID_PROD, sizeof(priv->model));
398         return 0;
399 }
400
401 static void ps3disk_prepare_flush(struct request_queue *q, struct request *req)
402 {
403         struct ps3_storage_device *dev = q->queuedata;
404
405         dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
406
407         req->cmd_type = REQ_TYPE_LINUX_BLOCK;
408         req->cmd[0] = REQ_LB_OP_FLUSH;
409 }
410
411 static unsigned long ps3disk_mask;
412
413 static DEFINE_MUTEX(ps3disk_mask_mutex);
414
415 static int __devinit ps3disk_probe(struct ps3_system_bus_device *_dev)
416 {
417         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
418         struct ps3disk_private *priv;
419         int error;
420         unsigned int devidx;
421         struct request_queue *queue;
422         struct gendisk *gendisk;
423
424         if (dev->blk_size < 512) {
425                 dev_err(&dev->sbd.core,
426                         "%s:%u: cannot handle block size %llu\n", __func__,
427                         __LINE__, dev->blk_size);
428                 return -EINVAL;
429         }
430
431         BUILD_BUG_ON(PS3DISK_MAX_DISKS > BITS_PER_LONG);
432         mutex_lock(&ps3disk_mask_mutex);
433         devidx = find_first_zero_bit(&ps3disk_mask, PS3DISK_MAX_DISKS);
434         if (devidx >= PS3DISK_MAX_DISKS) {
435                 dev_err(&dev->sbd.core, "%s:%u: Too many disks\n", __func__,
436                         __LINE__);
437                 mutex_unlock(&ps3disk_mask_mutex);
438                 return -ENOSPC;
439         }
440         __set_bit(devidx, &ps3disk_mask);
441         mutex_unlock(&ps3disk_mask_mutex);
442
443         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
444         if (!priv) {
445                 error = -ENOMEM;
446                 goto fail;
447         }
448
449         dev->sbd.core.driver_data = priv;
450         spin_lock_init(&priv->lock);
451
452         dev->bounce_size = BOUNCE_SIZE;
453         dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
454         if (!dev->bounce_buf) {
455                 error = -ENOMEM;
456                 goto fail_free_priv;
457         }
458
459         error = ps3stor_setup(dev, ps3disk_interrupt);
460         if (error)
461                 goto fail_free_bounce;
462
463         ps3disk_identify(dev);
464
465         queue = blk_init_queue(ps3disk_request, &priv->lock);
466         if (!queue) {
467                 dev_err(&dev->sbd.core, "%s:%u: blk_init_queue failed\n",
468                         __func__, __LINE__);
469                 error = -ENOMEM;
470                 goto fail_teardown;
471         }
472
473         priv->queue = queue;
474         queue->queuedata = dev;
475
476         blk_queue_bounce_limit(queue, BLK_BOUNCE_HIGH);
477
478         blk_queue_max_sectors(queue, dev->bounce_size >> 9);
479         blk_queue_segment_boundary(queue, -1UL);
480         blk_queue_dma_alignment(queue, dev->blk_size-1);
481         blk_queue_hardsect_size(queue, dev->blk_size);
482
483         blk_queue_ordered(queue, QUEUE_ORDERED_DRAIN_FLUSH,
484                           ps3disk_prepare_flush);
485
486         blk_queue_max_phys_segments(queue, -1);
487         blk_queue_max_hw_segments(queue, -1);
488         blk_queue_max_segment_size(queue, dev->bounce_size);
489
490         gendisk = alloc_disk(PS3DISK_MINORS);
491         if (!gendisk) {
492                 dev_err(&dev->sbd.core, "%s:%u: alloc_disk failed\n", __func__,
493                         __LINE__);
494                 error = -ENOMEM;
495                 goto fail_cleanup_queue;
496         }
497
498         priv->gendisk = gendisk;
499         gendisk->major = ps3disk_major;
500         gendisk->first_minor = devidx * PS3DISK_MINORS;
501         gendisk->fops = &ps3disk_fops;
502         gendisk->queue = queue;
503         gendisk->private_data = dev;
504         gendisk->driverfs_dev = &dev->sbd.core;
505         snprintf(gendisk->disk_name, sizeof(gendisk->disk_name), PS3DISK_NAME,
506                  devidx+'a');
507         priv->blocking_factor = dev->blk_size >> 9;
508         set_capacity(gendisk,
509                      dev->regions[dev->region_idx].size*priv->blocking_factor);
510
511         dev_info(&dev->sbd.core,
512                  "%s is a %s (%llu MiB total, %lu MiB for OtherOS)\n",
513                  gendisk->disk_name, priv->model, priv->raw_capacity >> 11,
514                  get_capacity(gendisk) >> 11);
515
516         add_disk(gendisk);
517         return 0;
518
519 fail_cleanup_queue:
520         blk_cleanup_queue(queue);
521 fail_teardown:
522         ps3stor_teardown(dev);
523 fail_free_bounce:
524         kfree(dev->bounce_buf);
525 fail_free_priv:
526         kfree(priv);
527         dev->sbd.core.driver_data = NULL;
528 fail:
529         mutex_lock(&ps3disk_mask_mutex);
530         __clear_bit(devidx, &ps3disk_mask);
531         mutex_unlock(&ps3disk_mask_mutex);
532         return error;
533 }
534
535 static int ps3disk_remove(struct ps3_system_bus_device *_dev)
536 {
537         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
538         struct ps3disk_private *priv = dev->sbd.core.driver_data;
539
540         mutex_lock(&ps3disk_mask_mutex);
541         __clear_bit(MINOR(disk_devt(priv->gendisk)) / PS3DISK_MINORS,
542                     &ps3disk_mask);
543         mutex_unlock(&ps3disk_mask_mutex);
544         del_gendisk(priv->gendisk);
545         blk_cleanup_queue(priv->queue);
546         put_disk(priv->gendisk);
547         dev_notice(&dev->sbd.core, "Synchronizing disk cache\n");
548         ps3disk_sync_cache(dev);
549         ps3stor_teardown(dev);
550         kfree(dev->bounce_buf);
551         kfree(priv);
552         dev->sbd.core.driver_data = NULL;
553         return 0;
554 }
555
556 static struct ps3_system_bus_driver ps3disk = {
557         .match_id       = PS3_MATCH_ID_STOR_DISK,
558         .core.name      = DEVICE_NAME,
559         .core.owner     = THIS_MODULE,
560         .probe          = ps3disk_probe,
561         .remove         = ps3disk_remove,
562         .shutdown       = ps3disk_remove,
563 };
564
565
566 static int __init ps3disk_init(void)
567 {
568         int error;
569
570         if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
571                 return -ENODEV;
572
573         error = register_blkdev(0, DEVICE_NAME);
574         if (error <= 0) {
575                 printk(KERN_ERR "%s:%u: register_blkdev failed %d\n", __func__,
576                        __LINE__, error);
577                 return error;
578         }
579         ps3disk_major = error;
580
581         pr_info("%s:%u: registered block device major %d\n", __func__,
582                 __LINE__, ps3disk_major);
583
584         error = ps3_system_bus_driver_register(&ps3disk);
585         if (error)
586                 unregister_blkdev(ps3disk_major, DEVICE_NAME);
587
588         return error;
589 }
590
591 static void __exit ps3disk_exit(void)
592 {
593         ps3_system_bus_driver_unregister(&ps3disk);
594         unregister_blkdev(ps3disk_major, DEVICE_NAME);
595 }
596
597 module_init(ps3disk_init);
598 module_exit(ps3disk_exit);
599
600 MODULE_LICENSE("GPL");
601 MODULE_DESCRIPTION("PS3 Disk Storage Driver");
602 MODULE_AUTHOR("Sony Corporation");
603 MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_DISK);