1 /* -*- linux-c -*-
2 * viodasd.c
3 * Authors: Dave Boutcher <boutcher@us.ibm.com>
4 * Ryan Arnold <ryanarn@us.ibm.com>
5 * Colin Devilbiss <devilbis@us.ibm.com>
6 * Stephen Rothwell
7 *
8 * (C) Copyright 2000-2004 IBM Corporation
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of the
13 * License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 * This routine provides access to disk space (termed "DASD" in historical
25 * IBM terms) owned and managed by an OS/400 partition running on the
26 * same box as this Linux partition.
27 *
28 * All disk operations are performed by sending messages back and forth to
29 * the OS/400 partition.
30 */
31 #include <linux/major.h>
32 #include <linux/fs.h>
33 #include <linux/module.h>
34 #include <linux/kernel.h>
35 #include <linux/blkdev.h>
36 #include <linux/genhd.h>
37 #include <linux/hdreg.h>
38 #include <linux/errno.h>
39 #include <linux/init.h>
40 #include <linux/string.h>
41 #include <linux/dma-mapping.h>
42 #include <linux/completion.h>
43 #include <linux/device.h>
44 #include <linux/scatterlist.h>
45
46 #include <asm/uaccess.h>
47 #include <asm/vio.h>
48 #include <asm/iseries/hv_types.h>
49 #include <asm/iseries/hv_lp_event.h>
50 #include <asm/iseries/hv_lp_config.h>
51 #include <asm/iseries/vio.h>
52 #include <asm/firmware.h>
53
54 MODULE_DESCRIPTION("iSeries Virtual DASD");
55 MODULE_AUTHOR("Dave Boutcher");
56 MODULE_LICENSE("GPL");
57
58 /*
59 * We only support 7 partitions per physical disk....so with minor
60 * numbers 0-255 we get a maximum of 32 disks.
61 */
62 #define VIOD_GENHD_NAME "iseries/vd"
63
64 #define VIOD_VERS "1.64"
65
66 #define VIOD_KERN_WARNING KERN_WARNING "viod: "
67 #define VIOD_KERN_INFO KERN_INFO "viod: "
68
69 enum {
70 PARTITION_SHIFT = 3,
71 MAX_DISKNO = HVMAXARCHITECTEDVIRTUALDISKS,
72 MAX_DISK_NAME = FIELD_SIZEOF(struct gendisk, disk_name)
73 };
74
75 static DEFINE_SPINLOCK(viodasd_spinlock);
76
77 #define VIOMAXREQ 16
78
79 #define DEVICE_NO(cell) ((struct viodasd_device *)(cell) - &viodasd_devices[0])
80
81 struct viodasd_waitevent {
82 struct completion com;
83 int rc;
84 u16 sub_result;
85 int max_disk; /* open */
86 };
87
88 static const struct vio_error_entry viodasd_err_table[] = {
89 { 0x0201, EINVAL, "Invalid Range" },
90 { 0x0202, EINVAL, "Invalid Token" },
91 { 0x0203, EIO, "DMA Error" },
92 { 0x0204, EIO, "Use Error" },
93 { 0x0205, EIO, "Release Error" },
94 { 0x0206, EINVAL, "Invalid Disk" },
95 { 0x0207, EBUSY, "Cant Lock" },
96 { 0x0208, EIO, "Already Locked" },
97 { 0x0209, EIO, "Already Unlocked" },
98 { 0x020A, EIO, "Invalid Arg" },
99 { 0x020B, EIO, "Bad IFS File" },
100 { 0x020C, EROFS, "Read Only Device" },
101 { 0x02FF, EIO, "Internal Error" },
102 { 0x0000, 0, NULL },
103 };
104
105 /*
106 * Figure out the biggest I/O request (in sectors) we can accept
107 */
108 #define VIODASD_MAXSECTORS (4096 / 512 * VIOMAXBLOCKDMA)
109
110 /*
111 * Number of disk I/O requests we've sent to OS/400
112 */
113 static int num_req_outstanding;
114
115 /*
116 * This is our internal structure for keeping track of disk devices
117 */
118 struct viodasd_device {
119 u16 cylinders;
120 u16 tracks;
121 u16 sectors;
122 u16 bytes_per_sector;
123 u64 size;
124 int read_only;
125 spinlock_t q_lock;
126 struct gendisk *disk;
127 struct device *dev;
128 } viodasd_devices[MAX_DISKNO];
129
130 /*
131 * External open entry point.
132 */
viodasd_open(struct block_device * bdev,fmode_t mode)133 static int viodasd_open(struct block_device *bdev, fmode_t mode)
134 {
135 struct viodasd_device *d = bdev->bd_disk->private_data;
136 HvLpEvent_Rc hvrc;
137 struct viodasd_waitevent we;
138 u16 flags = 0;
139
140 if (d->read_only) {
141 if (mode & FMODE_WRITE)
142 return -EROFS;
143 flags = vioblockflags_ro;
144 }
145
146 init_completion(&we.com);
147
148 /* Send the open event to OS/400 */
149 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
150 HvLpEvent_Type_VirtualIo,
151 viomajorsubtype_blockio | vioblockopen,
152 HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
153 viopath_sourceinst(viopath_hostLp),
154 viopath_targetinst(viopath_hostLp),
155 (u64)(unsigned long)&we, VIOVERSION << 16,
156 ((u64)DEVICE_NO(d) << 48) | ((u64)flags << 32),
157 0, 0, 0);
158 if (hvrc != 0) {
159 printk(VIOD_KERN_WARNING "HV open failed %d\n", (int)hvrc);
160 return -EIO;
161 }
162
163 wait_for_completion(&we.com);
164
165 /* Check the return code */
166 if (we.rc != 0) {
167 const struct vio_error_entry *err =
168 vio_lookup_rc(viodasd_err_table, we.sub_result);
169
170 printk(VIOD_KERN_WARNING
171 "bad rc opening disk: %d:0x%04x (%s)\n",
172 (int)we.rc, we.sub_result, err->msg);
173 return -EIO;
174 }
175
176 return 0;
177 }
178
179 /*
180 * External release entry point.
181 */
viodasd_release(struct gendisk * disk,fmode_t mode)182 static int viodasd_release(struct gendisk *disk, fmode_t mode)
183 {
184 struct viodasd_device *d = disk->private_data;
185 HvLpEvent_Rc hvrc;
186
187 /* Send the event to OS/400. We DON'T expect a response */
188 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
189 HvLpEvent_Type_VirtualIo,
190 viomajorsubtype_blockio | vioblockclose,
191 HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
192 viopath_sourceinst(viopath_hostLp),
193 viopath_targetinst(viopath_hostLp),
194 0, VIOVERSION << 16,
195 ((u64)DEVICE_NO(d) << 48) /* | ((u64)flags << 32) */,
196 0, 0, 0);
197 if (hvrc != 0)
198 printk(VIOD_KERN_WARNING "HV close call failed %d\n",
199 (int)hvrc);
200 return 0;
201 }
202
203
204 /* External ioctl entry point.
205 */
viodasd_getgeo(struct block_device * bdev,struct hd_geometry * geo)206 static int viodasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
207 {
208 struct gendisk *disk = bdev->bd_disk;
209 struct viodasd_device *d = disk->private_data;
210
211 geo->sectors = d->sectors ? d->sectors : 32;
212 geo->heads = d->tracks ? d->tracks : 64;
213 geo->cylinders = d->cylinders ? d->cylinders :
214 get_capacity(disk) / (geo->sectors * geo->heads);
215
216 return 0;
217 }
218
219 /*
220 * Our file operations table
221 */
222 static struct block_device_operations viodasd_fops = {
223 .owner = THIS_MODULE,
224 .open = viodasd_open,
225 .release = viodasd_release,
226 .getgeo = viodasd_getgeo,
227 };
228
229 /*
230 * End a request
231 */
viodasd_end_request(struct request * req,int error,int num_sectors)232 static void viodasd_end_request(struct request *req, int error,
233 int num_sectors)
234 {
235 __blk_end_request(req, error, num_sectors << 9);
236 }
237
238 /*
239 * Send an actual I/O request to OS/400
240 */
send_request(struct request * req)241 static int send_request(struct request *req)
242 {
243 u64 start;
244 int direction;
245 int nsg;
246 u16 viocmd;
247 HvLpEvent_Rc hvrc;
248 struct vioblocklpevent *bevent;
249 struct HvLpEvent *hev;
250 struct scatterlist sg[VIOMAXBLOCKDMA];
251 int sgindex;
252 struct viodasd_device *d;
253 unsigned long flags;
254
255 start = (u64)req->sector << 9;
256
257 if (rq_data_dir(req) == READ) {
258 direction = DMA_FROM_DEVICE;
259 viocmd = viomajorsubtype_blockio | vioblockread;
260 } else {
261 direction = DMA_TO_DEVICE;
262 viocmd = viomajorsubtype_blockio | vioblockwrite;
263 }
264
265 d = req->rq_disk->private_data;
266
267 /* Now build the scatter-gather list */
268 sg_init_table(sg, VIOMAXBLOCKDMA);
269 nsg = blk_rq_map_sg(req->q, req, sg);
270 nsg = dma_map_sg(d->dev, sg, nsg, direction);
271
272 spin_lock_irqsave(&viodasd_spinlock, flags);
273 num_req_outstanding++;
274
275 /* This optimization handles a single DMA block */
276 if (nsg == 1)
277 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
278 HvLpEvent_Type_VirtualIo, viocmd,
279 HvLpEvent_AckInd_DoAck,
280 HvLpEvent_AckType_ImmediateAck,
281 viopath_sourceinst(viopath_hostLp),
282 viopath_targetinst(viopath_hostLp),
283 (u64)(unsigned long)req, VIOVERSION << 16,
284 ((u64)DEVICE_NO(d) << 48), start,
285 ((u64)sg_dma_address(&sg[0])) << 32,
286 sg_dma_len(&sg[0]));
287 else {
288 bevent = (struct vioblocklpevent *)
289 vio_get_event_buffer(viomajorsubtype_blockio);
290 if (bevent == NULL) {
291 printk(VIOD_KERN_WARNING
292 "error allocating disk event buffer\n");
293 goto error_ret;
294 }
295
296 /*
297 * Now build up the actual request. Note that we store
298 * the pointer to the request in the correlation
299 * token so we can match the response up later
300 */
301 memset(bevent, 0, sizeof(struct vioblocklpevent));
302 hev = &bevent->event;
303 hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DO_ACK |
304 HV_LP_EVENT_INT;
305 hev->xType = HvLpEvent_Type_VirtualIo;
306 hev->xSubtype = viocmd;
307 hev->xSourceLp = HvLpConfig_getLpIndex();
308 hev->xTargetLp = viopath_hostLp;
309 hev->xSizeMinus1 =
310 offsetof(struct vioblocklpevent, u.rw_data.dma_info) +
311 (sizeof(bevent->u.rw_data.dma_info[0]) * nsg) - 1;
312 hev->xSourceInstanceId = viopath_sourceinst(viopath_hostLp);
313 hev->xTargetInstanceId = viopath_targetinst(viopath_hostLp);
314 hev->xCorrelationToken = (u64)req;
315 bevent->version = VIOVERSION;
316 bevent->disk = DEVICE_NO(d);
317 bevent->u.rw_data.offset = start;
318
319 /*
320 * Copy just the dma information from the sg list
321 * into the request
322 */
323 for (sgindex = 0; sgindex < nsg; sgindex++) {
324 bevent->u.rw_data.dma_info[sgindex].token =
325 sg_dma_address(&sg[sgindex]);
326 bevent->u.rw_data.dma_info[sgindex].len =
327 sg_dma_len(&sg[sgindex]);
328 }
329
330 /* Send the request */
331 hvrc = HvCallEvent_signalLpEvent(&bevent->event);
332 vio_free_event_buffer(viomajorsubtype_blockio, bevent);
333 }
334
335 if (hvrc != HvLpEvent_Rc_Good) {
336 printk(VIOD_KERN_WARNING
337 "error sending disk event to OS/400 (rc %d)\n",
338 (int)hvrc);
339 goto error_ret;
340 }
341 spin_unlock_irqrestore(&viodasd_spinlock, flags);
342 return 0;
343
344 error_ret:
345 num_req_outstanding--;
346 spin_unlock_irqrestore(&viodasd_spinlock, flags);
347 dma_unmap_sg(d->dev, sg, nsg, direction);
348 return -1;
349 }
350
351 /*
352 * This is the external request processing routine
353 */
do_viodasd_request(struct request_queue * q)354 static void do_viodasd_request(struct request_queue *q)
355 {
356 struct request *req;
357
358 /*
359 * If we already have the maximum number of requests
360 * outstanding to OS/400 just bail out. We'll come
361 * back later.
362 */
363 while (num_req_outstanding < VIOMAXREQ) {
364 req = elv_next_request(q);
365 if (req == NULL)
366 return;
367 /* dequeue the current request from the queue */
368 blkdev_dequeue_request(req);
369 /* check that request contains a valid command */
370 if (!blk_fs_request(req)) {
371 viodasd_end_request(req, -EIO, req->hard_nr_sectors);
372 continue;
373 }
374 /* Try sending the request */
375 if (send_request(req) != 0)
376 viodasd_end_request(req, -EIO, req->hard_nr_sectors);
377 }
378 }
379
380 /*
381 * Probe a single disk and fill in the viodasd_device structure
382 * for it.
383 */
probe_disk(struct viodasd_device * d)384 static int probe_disk(struct viodasd_device *d)
385 {
386 HvLpEvent_Rc hvrc;
387 struct viodasd_waitevent we;
388 int dev_no = DEVICE_NO(d);
389 struct gendisk *g;
390 struct request_queue *q;
391 u16 flags = 0;
392
393 retry:
394 init_completion(&we.com);
395
396 /* Send the open event to OS/400 */
397 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
398 HvLpEvent_Type_VirtualIo,
399 viomajorsubtype_blockio | vioblockopen,
400 HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
401 viopath_sourceinst(viopath_hostLp),
402 viopath_targetinst(viopath_hostLp),
403 (u64)(unsigned long)&we, VIOVERSION << 16,
404 ((u64)dev_no << 48) | ((u64)flags<< 32),
405 0, 0, 0);
406 if (hvrc != 0) {
407 printk(VIOD_KERN_WARNING "bad rc on HV open %d\n", (int)hvrc);
408 return 0;
409 }
410
411 wait_for_completion(&we.com);
412
413 if (we.rc != 0) {
414 if (flags != 0)
415 return 0;
416 /* try again with read only flag set */
417 flags = vioblockflags_ro;
418 goto retry;
419 }
420 if (we.max_disk > (MAX_DISKNO - 1)) {
421 static int warned;
422
423 if (warned == 0) {
424 warned++;
425 printk(VIOD_KERN_INFO
426 "Only examining the first %d "
427 "of %d disks connected\n",
428 MAX_DISKNO, we.max_disk + 1);
429 }
430 }
431
432 /* Send the close event to OS/400. We DON'T expect a response */
433 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
434 HvLpEvent_Type_VirtualIo,
435 viomajorsubtype_blockio | vioblockclose,
436 HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
437 viopath_sourceinst(viopath_hostLp),
438 viopath_targetinst(viopath_hostLp),
439 0, VIOVERSION << 16,
440 ((u64)dev_no << 48) | ((u64)flags << 32),
441 0, 0, 0);
442 if (hvrc != 0) {
443 printk(VIOD_KERN_WARNING
444 "bad rc sending event to OS/400 %d\n", (int)hvrc);
445 return 0;
446 }
447
448 if (d->dev == NULL) {
449 /* this is when we reprobe for new disks */
450 if (vio_create_viodasd(dev_no) == NULL) {
451 printk(VIOD_KERN_WARNING
452 "cannot allocate virtual device for disk %d\n",
453 dev_no);
454 return 0;
455 }
456 /*
457 * The vio_create_viodasd will have recursed into this
458 * routine with d->dev set to the new vio device and
459 * will finish the setup of the disk below.
460 */
461 return 1;
462 }
463
464 /* create the request queue for the disk */
465 spin_lock_init(&d->q_lock);
466 q = blk_init_queue(do_viodasd_request, &d->q_lock);
467 if (q == NULL) {
468 printk(VIOD_KERN_WARNING "cannot allocate queue for disk %d\n",
469 dev_no);
470 return 0;
471 }
472 g = alloc_disk(1 << PARTITION_SHIFT);
473 if (g == NULL) {
474 printk(VIOD_KERN_WARNING
475 "cannot allocate disk structure for disk %d\n",
476 dev_no);
477 blk_cleanup_queue(q);
478 return 0;
479 }
480
481 d->disk = g;
482 blk_queue_max_hw_segments(q, VIOMAXBLOCKDMA);
483 blk_queue_max_phys_segments(q, VIOMAXBLOCKDMA);
484 blk_queue_max_sectors(q, VIODASD_MAXSECTORS);
485 g->major = VIODASD_MAJOR;
486 g->first_minor = dev_no << PARTITION_SHIFT;
487 if (dev_no >= 26)
488 snprintf(g->disk_name, sizeof(g->disk_name),
489 VIOD_GENHD_NAME "%c%c",
490 'a' + (dev_no / 26) - 1, 'a' + (dev_no % 26));
491 else
492 snprintf(g->disk_name, sizeof(g->disk_name),
493 VIOD_GENHD_NAME "%c", 'a' + (dev_no % 26));
494 g->fops = &viodasd_fops;
495 g->queue = q;
496 g->private_data = d;
497 g->driverfs_dev = d->dev;
498 set_capacity(g, d->size >> 9);
499
500 printk(VIOD_KERN_INFO "disk %d: %lu sectors (%lu MB) "
501 "CHS=%d/%d/%d sector size %d%s\n",
502 dev_no, (unsigned long)(d->size >> 9),
503 (unsigned long)(d->size >> 20),
504 (int)d->cylinders, (int)d->tracks,
505 (int)d->sectors, (int)d->bytes_per_sector,
506 d->read_only ? " (RO)" : "");
507
508 /* register us in the global list */
509 add_disk(g);
510 return 1;
511 }
512
513 /* returns the total number of scatterlist elements converted */
block_event_to_scatterlist(const struct vioblocklpevent * bevent,struct scatterlist * sg,int * total_len)514 static int block_event_to_scatterlist(const struct vioblocklpevent *bevent,
515 struct scatterlist *sg, int *total_len)
516 {
517 int i, numsg;
518 const struct rw_data *rw_data = &bevent->u.rw_data;
519 static const int offset =
520 offsetof(struct vioblocklpevent, u.rw_data.dma_info);
521 static const int element_size = sizeof(rw_data->dma_info[0]);
522
523 numsg = ((bevent->event.xSizeMinus1 + 1) - offset) / element_size;
524 if (numsg > VIOMAXBLOCKDMA)
525 numsg = VIOMAXBLOCKDMA;
526
527 *total_len = 0;
528 sg_init_table(sg, VIOMAXBLOCKDMA);
529 for (i = 0; (i < numsg) && (rw_data->dma_info[i].len > 0); ++i) {
530 sg_dma_address(&sg[i]) = rw_data->dma_info[i].token;
531 sg_dma_len(&sg[i]) = rw_data->dma_info[i].len;
532 *total_len += rw_data->dma_info[i].len;
533 }
534 return i;
535 }
536
537 /*
538 * Restart all queues, starting with the one _after_ the disk given,
539 * thus reducing the chance of starvation of higher numbered disks.
540 */
viodasd_restart_all_queues_starting_from(int first_index)541 static void viodasd_restart_all_queues_starting_from(int first_index)
542 {
543 int i;
544
545 for (i = first_index + 1; i < MAX_DISKNO; ++i)
546 if (viodasd_devices[i].disk)
547 blk_run_queue(viodasd_devices[i].disk->queue);
548 for (i = 0; i <= first_index; ++i)
549 if (viodasd_devices[i].disk)
550 blk_run_queue(viodasd_devices[i].disk->queue);
551 }
552
553 /*
554 * For read and write requests, decrement the number of outstanding requests,
555 * Free the DMA buffers we allocated.
556 */
viodasd_handle_read_write(struct vioblocklpevent * bevent)557 static int viodasd_handle_read_write(struct vioblocklpevent *bevent)
558 {
559 int num_sg, num_sect, pci_direction, total_len;
560 struct request *req;
561 struct scatterlist sg[VIOMAXBLOCKDMA];
562 struct HvLpEvent *event = &bevent->event;
563 unsigned long irq_flags;
564 struct viodasd_device *d;
565 int error;
566 spinlock_t *qlock;
567
568 num_sg = block_event_to_scatterlist(bevent, sg, &total_len);
569 num_sect = total_len >> 9;
570 if (event->xSubtype == (viomajorsubtype_blockio | vioblockread))
571 pci_direction = DMA_FROM_DEVICE;
572 else
573 pci_direction = DMA_TO_DEVICE;
574 req = (struct request *)bevent->event.xCorrelationToken;
575 d = req->rq_disk->private_data;
576
577 dma_unmap_sg(d->dev, sg, num_sg, pci_direction);
578
579 /*
580 * Since this is running in interrupt mode, we need to make sure
581 * we're not stepping on any global I/O operations
582 */
583 spin_lock_irqsave(&viodasd_spinlock, irq_flags);
584 num_req_outstanding--;
585 spin_unlock_irqrestore(&viodasd_spinlock, irq_flags);
586
587 error = (event->xRc == HvLpEvent_Rc_Good) ? 0 : -EIO;
588 if (error) {
589 const struct vio_error_entry *err;
590 err = vio_lookup_rc(viodasd_err_table, bevent->sub_result);
591 printk(VIOD_KERN_WARNING "read/write error %d:0x%04x (%s)\n",
592 event->xRc, bevent->sub_result, err->msg);
593 num_sect = req->hard_nr_sectors;
594 }
595 qlock = req->q->queue_lock;
596 spin_lock_irqsave(qlock, irq_flags);
597 viodasd_end_request(req, error, num_sect);
598 spin_unlock_irqrestore(qlock, irq_flags);
599
600 /* Finally, try to get more requests off of this device's queue */
601 viodasd_restart_all_queues_starting_from(DEVICE_NO(d));
602
603 return 0;
604 }
605
606 /* This routine handles incoming block LP events */
handle_block_event(struct HvLpEvent * event)607 static void handle_block_event(struct HvLpEvent *event)
608 {
609 struct vioblocklpevent *bevent = (struct vioblocklpevent *)event;
610 struct viodasd_waitevent *pwe;
611
612 if (event == NULL)
613 /* Notification that a partition went away! */
614 return;
615 /* First, we should NEVER get an int here...only acks */
616 if (hvlpevent_is_int(event)) {
617 printk(VIOD_KERN_WARNING
618 "Yikes! got an int in viodasd event handler!\n");
619 if (hvlpevent_need_ack(event)) {
620 event->xRc = HvLpEvent_Rc_InvalidSubtype;
621 HvCallEvent_ackLpEvent(event);
622 }
623 }
624
625 switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
626 case vioblockopen:
627 /*
628 * Handle a response to an open request. We get all the
629 * disk information in the response, so update it. The
630 * correlation token contains a pointer to a waitevent
631 * structure that has a completion in it. update the
632 * return code in the waitevent structure and post the
633 * completion to wake up the guy who sent the request
634 */
635 pwe = (struct viodasd_waitevent *)event->xCorrelationToken;
636 pwe->rc = event->xRc;
637 pwe->sub_result = bevent->sub_result;
638 if (event->xRc == HvLpEvent_Rc_Good) {
639 const struct open_data *data = &bevent->u.open_data;
640 struct viodasd_device *device =
641 &viodasd_devices[bevent->disk];
642 device->read_only =
643 bevent->flags & vioblockflags_ro;
644 device->size = data->disk_size;
645 device->cylinders = data->cylinders;
646 device->tracks = data->tracks;
647 device->sectors = data->sectors;
648 device->bytes_per_sector = data->bytes_per_sector;
649 pwe->max_disk = data->max_disk;
650 }
651 complete(&pwe->com);
652 break;
653 case vioblockclose:
654 break;
655 case vioblockread:
656 case vioblockwrite:
657 viodasd_handle_read_write(bevent);
658 break;
659
660 default:
661 printk(VIOD_KERN_WARNING "invalid subtype!");
662 if (hvlpevent_need_ack(event)) {
663 event->xRc = HvLpEvent_Rc_InvalidSubtype;
664 HvCallEvent_ackLpEvent(event);
665 }
666 }
667 }
668
669 /*
670 * Get the driver to reprobe for more disks.
671 */
probe_disks(struct device_driver * drv,const char * buf,size_t count)672 static ssize_t probe_disks(struct device_driver *drv, const char *buf,
673 size_t count)
674 {
675 struct viodasd_device *d;
676
677 for (d = viodasd_devices; d < &viodasd_devices[MAX_DISKNO]; d++) {
678 if (d->disk == NULL)
679 probe_disk(d);
680 }
681 return count;
682 }
683 static DRIVER_ATTR(probe, S_IWUSR, NULL, probe_disks);
684
viodasd_probe(struct vio_dev * vdev,const struct vio_device_id * id)685 static int viodasd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
686 {
687 struct viodasd_device *d = &viodasd_devices[vdev->unit_address];
688
689 d->dev = &vdev->dev;
690 if (!probe_disk(d))
691 return -ENODEV;
692 return 0;
693 }
694
viodasd_remove(struct vio_dev * vdev)695 static int viodasd_remove(struct vio_dev *vdev)
696 {
697 struct viodasd_device *d;
698
699 d = &viodasd_devices[vdev->unit_address];
700 if (d->disk) {
701 del_gendisk(d->disk);
702 blk_cleanup_queue(d->disk->queue);
703 put_disk(d->disk);
704 d->disk = NULL;
705 }
706 d->dev = NULL;
707 return 0;
708 }
709
710 /**
711 * viodasd_device_table: Used by vio.c to match devices that we
712 * support.
713 */
714 static struct vio_device_id viodasd_device_table[] __devinitdata = {
715 { "block", "IBM,iSeries-viodasd" },
716 { "", "" }
717 };
718 MODULE_DEVICE_TABLE(vio, viodasd_device_table);
719
720 static struct vio_driver viodasd_driver = {
721 .id_table = viodasd_device_table,
722 .probe = viodasd_probe,
723 .remove = viodasd_remove,
724 .driver = {
725 .name = "viodasd",
726 .owner = THIS_MODULE,
727 }
728 };
729
730 static int need_delete_probe;
731
732 /*
733 * Initialize the whole device driver. Handle module and non-module
734 * versions
735 */
viodasd_init(void)736 static int __init viodasd_init(void)
737 {
738 int rc;
739
740 if (!firmware_has_feature(FW_FEATURE_ISERIES)) {
741 rc = -ENODEV;
742 goto early_fail;
743 }
744
745 /* Try to open to our host lp */
746 if (viopath_hostLp == HvLpIndexInvalid)
747 vio_set_hostlp();
748
749 if (viopath_hostLp == HvLpIndexInvalid) {
750 printk(VIOD_KERN_WARNING "invalid hosting partition\n");
751 rc = -EIO;
752 goto early_fail;
753 }
754
755 printk(VIOD_KERN_INFO "vers " VIOD_VERS ", hosting partition %d\n",
756 viopath_hostLp);
757
758 /* register the block device */
759 rc = register_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME);
760 if (rc) {
761 printk(VIOD_KERN_WARNING
762 "Unable to get major number %d for %s\n",
763 VIODASD_MAJOR, VIOD_GENHD_NAME);
764 goto early_fail;
765 }
766 /* Actually open the path to the hosting partition */
767 rc = viopath_open(viopath_hostLp, viomajorsubtype_blockio,
768 VIOMAXREQ + 2);
769 if (rc) {
770 printk(VIOD_KERN_WARNING
771 "error opening path to host partition %d\n",
772 viopath_hostLp);
773 goto unregister_blk;
774 }
775
776 /* Initialize our request handler */
777 vio_setHandler(viomajorsubtype_blockio, handle_block_event);
778
779 rc = vio_register_driver(&viodasd_driver);
780 if (rc) {
781 printk(VIOD_KERN_WARNING "vio_register_driver failed\n");
782 goto unset_handler;
783 }
784
785 /*
786 * If this call fails, it just means that we cannot dynamically
787 * add virtual disks, but the driver will still work fine for
788 * all existing disk, so ignore the failure.
789 */
790 if (!driver_create_file(&viodasd_driver.driver, &driver_attr_probe))
791 need_delete_probe = 1;
792
793 return 0;
794
795 unset_handler:
796 vio_clearHandler(viomajorsubtype_blockio);
797 viopath_close(viopath_hostLp, viomajorsubtype_blockio, VIOMAXREQ + 2);
798 unregister_blk:
799 unregister_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME);
800 early_fail:
801 return rc;
802 }
803 module_init(viodasd_init);
804
viodasd_exit(void)805 void __exit viodasd_exit(void)
806 {
807 if (need_delete_probe)
808 driver_remove_file(&viodasd_driver.driver, &driver_attr_probe);
809 vio_unregister_driver(&viodasd_driver);
810 vio_clearHandler(viomajorsubtype_blockio);
811 viopath_close(viopath_hostLp, viomajorsubtype_blockio, VIOMAXREQ + 2);
812 unregister_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME);
813 }
814 module_exit(viodasd_exit);
815