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1da177e4 LT |
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 <sfr@au1.ibm.com> | |
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> | |
1da177e4 LT |
44 | |
45 | #include <asm/uaccess.h> | |
46 | #include <asm/vio.h> | |
1ec65d76 | 47 | #include <asm/iseries/hv_types.h> |
e45423ea | 48 | #include <asm/iseries/hv_lp_event.h> |
15b17189 | 49 | #include <asm/iseries/hv_lp_config.h> |
b4206778 | 50 | #include <asm/iseries/vio.h> |
fb8b5007 | 51 | #include <asm/firmware.h> |
1da177e4 LT |
52 | |
53 | MODULE_DESCRIPTION("iSeries Virtual DASD"); | |
54 | MODULE_AUTHOR("Dave Boutcher"); | |
55 | MODULE_LICENSE("GPL"); | |
56 | ||
57 | /* | |
58 | * We only support 7 partitions per physical disk....so with minor | |
59 | * numbers 0-255 we get a maximum of 32 disks. | |
60 | */ | |
61 | #define VIOD_GENHD_NAME "iseries/vd" | |
1da177e4 LT |
62 | |
63 | #define VIOD_VERS "1.64" | |
64 | ||
65 | #define VIOD_KERN_WARNING KERN_WARNING "viod: " | |
66 | #define VIOD_KERN_INFO KERN_INFO "viod: " | |
67 | ||
68 | enum { | |
69 | PARTITION_SHIFT = 3, | |
70 | MAX_DISKNO = HVMAXARCHITECTEDVIRTUALDISKS, | |
71 | MAX_DISK_NAME = sizeof(((struct gendisk *)0)->disk_name) | |
72 | }; | |
73 | ||
74 | static DEFINE_SPINLOCK(viodasd_spinlock); | |
75 | ||
76 | #define VIOMAXREQ 16 | |
1da177e4 LT |
77 | |
78 | #define DEVICE_NO(cell) ((struct viodasd_device *)(cell) - &viodasd_devices[0]) | |
79 | ||
1da177e4 LT |
80 | struct viodasd_waitevent { |
81 | struct completion com; | |
82 | int rc; | |
83 | u16 sub_result; | |
84 | int max_disk; /* open */ | |
85 | }; | |
86 | ||
87 | static const struct vio_error_entry viodasd_err_table[] = { | |
88 | { 0x0201, EINVAL, "Invalid Range" }, | |
89 | { 0x0202, EINVAL, "Invalid Token" }, | |
90 | { 0x0203, EIO, "DMA Error" }, | |
91 | { 0x0204, EIO, "Use Error" }, | |
92 | { 0x0205, EIO, "Release Error" }, | |
93 | { 0x0206, EINVAL, "Invalid Disk" }, | |
94 | { 0x0207, EBUSY, "Cant Lock" }, | |
95 | { 0x0208, EIO, "Already Locked" }, | |
96 | { 0x0209, EIO, "Already Unlocked" }, | |
97 | { 0x020A, EIO, "Invalid Arg" }, | |
98 | { 0x020B, EIO, "Bad IFS File" }, | |
99 | { 0x020C, EROFS, "Read Only Device" }, | |
100 | { 0x02FF, EIO, "Internal Error" }, | |
101 | { 0x0000, 0, NULL }, | |
102 | }; | |
103 | ||
104 | /* | |
105 | * Figure out the biggest I/O request (in sectors) we can accept | |
106 | */ | |
107 | #define VIODASD_MAXSECTORS (4096 / 512 * VIOMAXBLOCKDMA) | |
108 | ||
109 | /* | |
110 | * Number of disk I/O requests we've sent to OS/400 | |
111 | */ | |
112 | static int num_req_outstanding; | |
113 | ||
114 | /* | |
115 | * This is our internal structure for keeping track of disk devices | |
116 | */ | |
117 | struct viodasd_device { | |
118 | u16 cylinders; | |
119 | u16 tracks; | |
120 | u16 sectors; | |
121 | u16 bytes_per_sector; | |
122 | u64 size; | |
123 | int read_only; | |
124 | spinlock_t q_lock; | |
125 | struct gendisk *disk; | |
126 | struct device *dev; | |
127 | } viodasd_devices[MAX_DISKNO]; | |
128 | ||
129 | /* | |
130 | * External open entry point. | |
131 | */ | |
132 | static int viodasd_open(struct inode *ino, struct file *fil) | |
133 | { | |
134 | struct viodasd_device *d = ino->i_bdev->bd_disk->private_data; | |
135 | HvLpEvent_Rc hvrc; | |
136 | struct viodasd_waitevent we; | |
137 | u16 flags = 0; | |
138 | ||
139 | if (d->read_only) { | |
140 | if ((fil != NULL) && (fil->f_mode & FMODE_WRITE)) | |
141 | return -EROFS; | |
142 | flags = vioblockflags_ro; | |
143 | } | |
144 | ||
145 | init_completion(&we.com); | |
146 | ||
147 | /* Send the open event to OS/400 */ | |
148 | hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, | |
149 | HvLpEvent_Type_VirtualIo, | |
150 | viomajorsubtype_blockio | vioblockopen, | |
151 | HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck, | |
152 | viopath_sourceinst(viopath_hostLp), | |
153 | viopath_targetinst(viopath_hostLp), | |
154 | (u64)(unsigned long)&we, VIOVERSION << 16, | |
155 | ((u64)DEVICE_NO(d) << 48) | ((u64)flags << 32), | |
156 | 0, 0, 0); | |
157 | if (hvrc != 0) { | |
158 | printk(VIOD_KERN_WARNING "HV open failed %d\n", (int)hvrc); | |
159 | return -EIO; | |
160 | } | |
161 | ||
162 | wait_for_completion(&we.com); | |
163 | ||
164 | /* Check the return code */ | |
165 | if (we.rc != 0) { | |
166 | const struct vio_error_entry *err = | |
167 | vio_lookup_rc(viodasd_err_table, we.sub_result); | |
168 | ||
169 | printk(VIOD_KERN_WARNING | |
170 | "bad rc opening disk: %d:0x%04x (%s)\n", | |
171 | (int)we.rc, we.sub_result, err->msg); | |
172 | return -EIO; | |
173 | } | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | /* | |
179 | * External release entry point. | |
180 | */ | |
181 | static int viodasd_release(struct inode *ino, struct file *fil) | |
182 | { | |
183 | struct viodasd_device *d = ino->i_bdev->bd_disk->private_data; | |
184 | HvLpEvent_Rc hvrc; | |
185 | ||
186 | /* Send the event to OS/400. We DON'T expect a response */ | |
187 | hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, | |
188 | HvLpEvent_Type_VirtualIo, | |
189 | viomajorsubtype_blockio | vioblockclose, | |
190 | HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck, | |
191 | viopath_sourceinst(viopath_hostLp), | |
192 | viopath_targetinst(viopath_hostLp), | |
193 | 0, VIOVERSION << 16, | |
194 | ((u64)DEVICE_NO(d) << 48) /* | ((u64)flags << 32) */, | |
195 | 0, 0, 0); | |
196 | if (hvrc != 0) | |
197 | printk(VIOD_KERN_WARNING "HV close call failed %d\n", | |
198 | (int)hvrc); | |
199 | return 0; | |
200 | } | |
201 | ||
202 | ||
203 | /* External ioctl entry point. | |
204 | */ | |
a885c8c4 | 205 | static int viodasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1da177e4 | 206 | { |
a885c8c4 CH |
207 | struct gendisk *disk = bdev->bd_disk; |
208 | struct viodasd_device *d = disk->private_data; | |
209 | ||
36a70030 | 210 | geo->sectors = d->sectors ? d->sectors : 32; |
a885c8c4 CH |
211 | geo->heads = d->tracks ? d->tracks : 64; |
212 | geo->cylinders = d->cylinders ? d->cylinders : | |
36a70030 | 213 | get_capacity(disk) / (geo->sectors * geo->heads); |
1da177e4 | 214 | |
a885c8c4 | 215 | return 0; |
1da177e4 LT |
216 | } |
217 | ||
218 | /* | |
219 | * Our file operations table | |
220 | */ | |
221 | static struct block_device_operations viodasd_fops = { | |
222 | .owner = THIS_MODULE, | |
223 | .open = viodasd_open, | |
224 | .release = viodasd_release, | |
a885c8c4 | 225 | .getgeo = viodasd_getgeo, |
1da177e4 LT |
226 | }; |
227 | ||
228 | /* | |
229 | * End a request | |
230 | */ | |
231 | static void viodasd_end_request(struct request *req, int uptodate, | |
232 | int num_sectors) | |
233 | { | |
234 | if (end_that_request_first(req, uptodate, num_sectors)) | |
235 | return; | |
236 | add_disk_randomness(req->rq_disk); | |
8ffdc655 | 237 | end_that_request_last(req, uptodate); |
1da177e4 LT |
238 | } |
239 | ||
240 | /* | |
241 | * Send an actual I/O request to OS/400 | |
242 | */ | |
243 | static int send_request(struct request *req) | |
244 | { | |
245 | u64 start; | |
246 | int direction; | |
247 | int nsg; | |
248 | u16 viocmd; | |
249 | HvLpEvent_Rc hvrc; | |
250 | struct vioblocklpevent *bevent; | |
677f8c0d | 251 | struct HvLpEvent *hev; |
1da177e4 LT |
252 | struct scatterlist sg[VIOMAXBLOCKDMA]; |
253 | int sgindex; | |
254 | int statindex; | |
255 | struct viodasd_device *d; | |
256 | unsigned long flags; | |
257 | ||
258 | start = (u64)req->sector << 9; | |
259 | ||
260 | if (rq_data_dir(req) == READ) { | |
261 | direction = DMA_FROM_DEVICE; | |
262 | viocmd = viomajorsubtype_blockio | vioblockread; | |
263 | statindex = 0; | |
264 | } else { | |
265 | direction = DMA_TO_DEVICE; | |
266 | viocmd = viomajorsubtype_blockio | vioblockwrite; | |
267 | statindex = 1; | |
268 | } | |
269 | ||
270 | d = req->rq_disk->private_data; | |
271 | ||
272 | /* Now build the scatter-gather list */ | |
273 | nsg = blk_rq_map_sg(req->q, req, sg); | |
274 | nsg = dma_map_sg(d->dev, sg, nsg, direction); | |
275 | ||
276 | spin_lock_irqsave(&viodasd_spinlock, flags); | |
277 | num_req_outstanding++; | |
278 | ||
279 | /* This optimization handles a single DMA block */ | |
280 | if (nsg == 1) | |
281 | hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, | |
282 | HvLpEvent_Type_VirtualIo, viocmd, | |
283 | HvLpEvent_AckInd_DoAck, | |
284 | HvLpEvent_AckType_ImmediateAck, | |
285 | viopath_sourceinst(viopath_hostLp), | |
286 | viopath_targetinst(viopath_hostLp), | |
287 | (u64)(unsigned long)req, VIOVERSION << 16, | |
288 | ((u64)DEVICE_NO(d) << 48), start, | |
289 | ((u64)sg_dma_address(&sg[0])) << 32, | |
290 | sg_dma_len(&sg[0])); | |
291 | else { | |
292 | bevent = (struct vioblocklpevent *) | |
293 | vio_get_event_buffer(viomajorsubtype_blockio); | |
294 | if (bevent == NULL) { | |
295 | printk(VIOD_KERN_WARNING | |
296 | "error allocating disk event buffer\n"); | |
297 | goto error_ret; | |
298 | } | |
299 | ||
300 | /* | |
301 | * Now build up the actual request. Note that we store | |
302 | * the pointer to the request in the correlation | |
303 | * token so we can match the response up later | |
304 | */ | |
305 | memset(bevent, 0, sizeof(struct vioblocklpevent)); | |
677f8c0d SR |
306 | hev = &bevent->event; |
307 | hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DO_ACK | | |
308 | HV_LP_EVENT_INT; | |
309 | hev->xType = HvLpEvent_Type_VirtualIo; | |
310 | hev->xSubtype = viocmd; | |
311 | hev->xSourceLp = HvLpConfig_getLpIndex(); | |
312 | hev->xTargetLp = viopath_hostLp; | |
313 | hev->xSizeMinus1 = | |
1da177e4 LT |
314 | offsetof(struct vioblocklpevent, u.rw_data.dma_info) + |
315 | (sizeof(bevent->u.rw_data.dma_info[0]) * nsg) - 1; | |
677f8c0d SR |
316 | hev->xSourceInstanceId = viopath_sourceinst(viopath_hostLp); |
317 | hev->xTargetInstanceId = viopath_targetinst(viopath_hostLp); | |
318 | hev->xCorrelationToken = (u64)req; | |
1da177e4 LT |
319 | bevent->version = VIOVERSION; |
320 | bevent->disk = DEVICE_NO(d); | |
321 | bevent->u.rw_data.offset = start; | |
322 | ||
323 | /* | |
324 | * Copy just the dma information from the sg list | |
325 | * into the request | |
326 | */ | |
327 | for (sgindex = 0; sgindex < nsg; sgindex++) { | |
328 | bevent->u.rw_data.dma_info[sgindex].token = | |
329 | sg_dma_address(&sg[sgindex]); | |
330 | bevent->u.rw_data.dma_info[sgindex].len = | |
331 | sg_dma_len(&sg[sgindex]); | |
332 | } | |
333 | ||
334 | /* Send the request */ | |
335 | hvrc = HvCallEvent_signalLpEvent(&bevent->event); | |
336 | vio_free_event_buffer(viomajorsubtype_blockio, bevent); | |
337 | } | |
338 | ||
339 | if (hvrc != HvLpEvent_Rc_Good) { | |
340 | printk(VIOD_KERN_WARNING | |
341 | "error sending disk event to OS/400 (rc %d)\n", | |
342 | (int)hvrc); | |
343 | goto error_ret; | |
344 | } | |
345 | spin_unlock_irqrestore(&viodasd_spinlock, flags); | |
346 | return 0; | |
347 | ||
348 | error_ret: | |
349 | num_req_outstanding--; | |
350 | spin_unlock_irqrestore(&viodasd_spinlock, flags); | |
351 | dma_unmap_sg(d->dev, sg, nsg, direction); | |
352 | return -1; | |
353 | } | |
354 | ||
355 | /* | |
356 | * This is the external request processing routine | |
357 | */ | |
165125e1 | 358 | static void do_viodasd_request(struct request_queue *q) |
1da177e4 LT |
359 | { |
360 | struct request *req; | |
361 | ||
362 | /* | |
363 | * If we already have the maximum number of requests | |
364 | * outstanding to OS/400 just bail out. We'll come | |
365 | * back later. | |
366 | */ | |
367 | while (num_req_outstanding < VIOMAXREQ) { | |
368 | req = elv_next_request(q); | |
369 | if (req == NULL) | |
370 | return; | |
371 | /* dequeue the current request from the queue */ | |
372 | blkdev_dequeue_request(req); | |
373 | /* check that request contains a valid command */ | |
374 | if (!blk_fs_request(req)) { | |
375 | viodasd_end_request(req, 0, req->hard_nr_sectors); | |
376 | continue; | |
377 | } | |
378 | /* Try sending the request */ | |
379 | if (send_request(req) != 0) | |
380 | viodasd_end_request(req, 0, req->hard_nr_sectors); | |
381 | } | |
382 | } | |
383 | ||
384 | /* | |
385 | * Probe a single disk and fill in the viodasd_device structure | |
386 | * for it. | |
387 | */ | |
8251b4c4 | 388 | static int probe_disk(struct viodasd_device *d) |
1da177e4 LT |
389 | { |
390 | HvLpEvent_Rc hvrc; | |
391 | struct viodasd_waitevent we; | |
392 | int dev_no = DEVICE_NO(d); | |
393 | struct gendisk *g; | |
394 | struct request_queue *q; | |
395 | u16 flags = 0; | |
396 | ||
397 | retry: | |
398 | init_completion(&we.com); | |
399 | ||
400 | /* Send the open event to OS/400 */ | |
401 | hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, | |
402 | HvLpEvent_Type_VirtualIo, | |
403 | viomajorsubtype_blockio | vioblockopen, | |
404 | HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck, | |
405 | viopath_sourceinst(viopath_hostLp), | |
406 | viopath_targetinst(viopath_hostLp), | |
407 | (u64)(unsigned long)&we, VIOVERSION << 16, | |
408 | ((u64)dev_no << 48) | ((u64)flags<< 32), | |
409 | 0, 0, 0); | |
410 | if (hvrc != 0) { | |
411 | printk(VIOD_KERN_WARNING "bad rc on HV open %d\n", (int)hvrc); | |
8251b4c4 | 412 | return 0; |
1da177e4 LT |
413 | } |
414 | ||
415 | wait_for_completion(&we.com); | |
416 | ||
417 | if (we.rc != 0) { | |
418 | if (flags != 0) | |
8251b4c4 | 419 | return 0; |
1da177e4 LT |
420 | /* try again with read only flag set */ |
421 | flags = vioblockflags_ro; | |
422 | goto retry; | |
423 | } | |
424 | if (we.max_disk > (MAX_DISKNO - 1)) { | |
425 | static int warned; | |
426 | ||
427 | if (warned == 0) { | |
428 | warned++; | |
429 | printk(VIOD_KERN_INFO | |
430 | "Only examining the first %d " | |
431 | "of %d disks connected\n", | |
432 | MAX_DISKNO, we.max_disk + 1); | |
433 | } | |
434 | } | |
435 | ||
436 | /* Send the close event to OS/400. We DON'T expect a response */ | |
437 | hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, | |
438 | HvLpEvent_Type_VirtualIo, | |
439 | viomajorsubtype_blockio | vioblockclose, | |
440 | HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck, | |
441 | viopath_sourceinst(viopath_hostLp), | |
442 | viopath_targetinst(viopath_hostLp), | |
443 | 0, VIOVERSION << 16, | |
444 | ((u64)dev_no << 48) | ((u64)flags << 32), | |
445 | 0, 0, 0); | |
446 | if (hvrc != 0) { | |
447 | printk(VIOD_KERN_WARNING | |
448 | "bad rc sending event to OS/400 %d\n", (int)hvrc); | |
8251b4c4 | 449 | return 0; |
1da177e4 | 450 | } |
8251b4c4 SR |
451 | |
452 | if (d->dev == NULL) { | |
453 | /* this is when we reprobe for new disks */ | |
454 | if (vio_create_viodasd(dev_no) == NULL) { | |
455 | printk(VIOD_KERN_WARNING | |
456 | "cannot allocate virtual device for disk %d\n", | |
457 | dev_no); | |
458 | return 0; | |
459 | } | |
460 | /* | |
461 | * The vio_create_viodasd will have recursed into this | |
462 | * routine with d->dev set to the new vio device and | |
463 | * will finish the setup of the disk below. | |
464 | */ | |
465 | return 1; | |
466 | } | |
467 | ||
1da177e4 LT |
468 | /* create the request queue for the disk */ |
469 | spin_lock_init(&d->q_lock); | |
470 | q = blk_init_queue(do_viodasd_request, &d->q_lock); | |
471 | if (q == NULL) { | |
472 | printk(VIOD_KERN_WARNING "cannot allocate queue for disk %d\n", | |
473 | dev_no); | |
8251b4c4 | 474 | return 0; |
1da177e4 LT |
475 | } |
476 | g = alloc_disk(1 << PARTITION_SHIFT); | |
477 | if (g == NULL) { | |
478 | printk(VIOD_KERN_WARNING | |
479 | "cannot allocate disk structure for disk %d\n", | |
480 | dev_no); | |
481 | blk_cleanup_queue(q); | |
8251b4c4 | 482 | return 0; |
1da177e4 LT |
483 | } |
484 | ||
485 | d->disk = g; | |
486 | blk_queue_max_hw_segments(q, VIOMAXBLOCKDMA); | |
487 | blk_queue_max_phys_segments(q, VIOMAXBLOCKDMA); | |
488 | blk_queue_max_sectors(q, VIODASD_MAXSECTORS); | |
489 | g->major = VIODASD_MAJOR; | |
490 | g->first_minor = dev_no << PARTITION_SHIFT; | |
491 | if (dev_no >= 26) | |
492 | snprintf(g->disk_name, sizeof(g->disk_name), | |
493 | VIOD_GENHD_NAME "%c%c", | |
494 | 'a' + (dev_no / 26) - 1, 'a' + (dev_no % 26)); | |
495 | else | |
496 | snprintf(g->disk_name, sizeof(g->disk_name), | |
497 | VIOD_GENHD_NAME "%c", 'a' + (dev_no % 26)); | |
1da177e4 LT |
498 | g->fops = &viodasd_fops; |
499 | g->queue = q; | |
500 | g->private_data = d; | |
501 | g->driverfs_dev = d->dev; | |
502 | set_capacity(g, d->size >> 9); | |
503 | ||
504 | printk(VIOD_KERN_INFO "disk %d: %lu sectors (%lu MB) " | |
505 | "CHS=%d/%d/%d sector size %d%s\n", | |
506 | dev_no, (unsigned long)(d->size >> 9), | |
507 | (unsigned long)(d->size >> 20), | |
508 | (int)d->cylinders, (int)d->tracks, | |
509 | (int)d->sectors, (int)d->bytes_per_sector, | |
510 | d->read_only ? " (RO)" : ""); | |
511 | ||
512 | /* register us in the global list */ | |
513 | add_disk(g); | |
8251b4c4 | 514 | return 1; |
1da177e4 LT |
515 | } |
516 | ||
517 | /* returns the total number of scatterlist elements converted */ | |
518 | static int block_event_to_scatterlist(const struct vioblocklpevent *bevent, | |
519 | struct scatterlist *sg, int *total_len) | |
520 | { | |
521 | int i, numsg; | |
522 | const struct rw_data *rw_data = &bevent->u.rw_data; | |
523 | static const int offset = | |
524 | offsetof(struct vioblocklpevent, u.rw_data.dma_info); | |
525 | static const int element_size = sizeof(rw_data->dma_info[0]); | |
526 | ||
527 | numsg = ((bevent->event.xSizeMinus1 + 1) - offset) / element_size; | |
528 | if (numsg > VIOMAXBLOCKDMA) | |
529 | numsg = VIOMAXBLOCKDMA; | |
530 | ||
531 | *total_len = 0; | |
532 | memset(sg, 0, sizeof(sg[0]) * VIOMAXBLOCKDMA); | |
533 | ||
534 | for (i = 0; (i < numsg) && (rw_data->dma_info[i].len > 0); ++i) { | |
535 | sg_dma_address(&sg[i]) = rw_data->dma_info[i].token; | |
536 | sg_dma_len(&sg[i]) = rw_data->dma_info[i].len; | |
537 | *total_len += rw_data->dma_info[i].len; | |
538 | } | |
539 | return i; | |
540 | } | |
541 | ||
542 | /* | |
543 | * Restart all queues, starting with the one _after_ the disk given, | |
544 | * thus reducing the chance of starvation of higher numbered disks. | |
545 | */ | |
546 | static void viodasd_restart_all_queues_starting_from(int first_index) | |
547 | { | |
548 | int i; | |
549 | ||
550 | for (i = first_index + 1; i < MAX_DISKNO; ++i) | |
551 | if (viodasd_devices[i].disk) | |
552 | blk_run_queue(viodasd_devices[i].disk->queue); | |
553 | for (i = 0; i <= first_index; ++i) | |
554 | if (viodasd_devices[i].disk) | |
555 | blk_run_queue(viodasd_devices[i].disk->queue); | |
556 | } | |
557 | ||
558 | /* | |
559 | * For read and write requests, decrement the number of outstanding requests, | |
560 | * Free the DMA buffers we allocated. | |
561 | */ | |
562 | static int viodasd_handle_read_write(struct vioblocklpevent *bevent) | |
563 | { | |
564 | int num_sg, num_sect, pci_direction, total_len; | |
565 | struct request *req; | |
566 | struct scatterlist sg[VIOMAXBLOCKDMA]; | |
567 | struct HvLpEvent *event = &bevent->event; | |
568 | unsigned long irq_flags; | |
569 | struct viodasd_device *d; | |
570 | int error; | |
571 | spinlock_t *qlock; | |
572 | ||
573 | num_sg = block_event_to_scatterlist(bevent, sg, &total_len); | |
574 | num_sect = total_len >> 9; | |
575 | if (event->xSubtype == (viomajorsubtype_blockio | vioblockread)) | |
576 | pci_direction = DMA_FROM_DEVICE; | |
577 | else | |
578 | pci_direction = DMA_TO_DEVICE; | |
579 | req = (struct request *)bevent->event.xCorrelationToken; | |
580 | d = req->rq_disk->private_data; | |
581 | ||
582 | dma_unmap_sg(d->dev, sg, num_sg, pci_direction); | |
583 | ||
584 | /* | |
585 | * Since this is running in interrupt mode, we need to make sure | |
586 | * we're not stepping on any global I/O operations | |
587 | */ | |
588 | spin_lock_irqsave(&viodasd_spinlock, irq_flags); | |
589 | num_req_outstanding--; | |
590 | spin_unlock_irqrestore(&viodasd_spinlock, irq_flags); | |
591 | ||
592 | error = event->xRc != HvLpEvent_Rc_Good; | |
593 | if (error) { | |
594 | const struct vio_error_entry *err; | |
595 | err = vio_lookup_rc(viodasd_err_table, bevent->sub_result); | |
596 | printk(VIOD_KERN_WARNING "read/write error %d:0x%04x (%s)\n", | |
597 | event->xRc, bevent->sub_result, err->msg); | |
598 | num_sect = req->hard_nr_sectors; | |
599 | } | |
600 | qlock = req->q->queue_lock; | |
601 | spin_lock_irqsave(qlock, irq_flags); | |
602 | viodasd_end_request(req, !error, num_sect); | |
603 | spin_unlock_irqrestore(qlock, irq_flags); | |
604 | ||
605 | /* Finally, try to get more requests off of this device's queue */ | |
606 | viodasd_restart_all_queues_starting_from(DEVICE_NO(d)); | |
607 | ||
608 | return 0; | |
609 | } | |
610 | ||
611 | /* This routine handles incoming block LP events */ | |
612 | static void handle_block_event(struct HvLpEvent *event) | |
613 | { | |
614 | struct vioblocklpevent *bevent = (struct vioblocklpevent *)event; | |
615 | struct viodasd_waitevent *pwe; | |
616 | ||
617 | if (event == NULL) | |
618 | /* Notification that a partition went away! */ | |
619 | return; | |
620 | /* First, we should NEVER get an int here...only acks */ | |
677f8c0d | 621 | if (hvlpevent_is_int(event)) { |
1da177e4 LT |
622 | printk(VIOD_KERN_WARNING |
623 | "Yikes! got an int in viodasd event handler!\n"); | |
677f8c0d | 624 | if (hvlpevent_need_ack(event)) { |
1da177e4 LT |
625 | event->xRc = HvLpEvent_Rc_InvalidSubtype; |
626 | HvCallEvent_ackLpEvent(event); | |
627 | } | |
628 | } | |
629 | ||
630 | switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) { | |
631 | case vioblockopen: | |
632 | /* | |
633 | * Handle a response to an open request. We get all the | |
634 | * disk information in the response, so update it. The | |
635 | * correlation token contains a pointer to a waitevent | |
636 | * structure that has a completion in it. update the | |
637 | * return code in the waitevent structure and post the | |
638 | * completion to wake up the guy who sent the request | |
639 | */ | |
640 | pwe = (struct viodasd_waitevent *)event->xCorrelationToken; | |
641 | pwe->rc = event->xRc; | |
642 | pwe->sub_result = bevent->sub_result; | |
643 | if (event->xRc == HvLpEvent_Rc_Good) { | |
644 | const struct open_data *data = &bevent->u.open_data; | |
645 | struct viodasd_device *device = | |
646 | &viodasd_devices[bevent->disk]; | |
647 | device->read_only = | |
648 | bevent->flags & vioblockflags_ro; | |
649 | device->size = data->disk_size; | |
650 | device->cylinders = data->cylinders; | |
651 | device->tracks = data->tracks; | |
652 | device->sectors = data->sectors; | |
653 | device->bytes_per_sector = data->bytes_per_sector; | |
654 | pwe->max_disk = data->max_disk; | |
655 | } | |
656 | complete(&pwe->com); | |
657 | break; | |
658 | case vioblockclose: | |
659 | break; | |
660 | case vioblockread: | |
661 | case vioblockwrite: | |
662 | viodasd_handle_read_write(bevent); | |
663 | break; | |
664 | ||
665 | default: | |
666 | printk(VIOD_KERN_WARNING "invalid subtype!"); | |
677f8c0d | 667 | if (hvlpevent_need_ack(event)) { |
1da177e4 LT |
668 | event->xRc = HvLpEvent_Rc_InvalidSubtype; |
669 | HvCallEvent_ackLpEvent(event); | |
670 | } | |
671 | } | |
672 | } | |
673 | ||
674 | /* | |
675 | * Get the driver to reprobe for more disks. | |
676 | */ | |
677 | static ssize_t probe_disks(struct device_driver *drv, const char *buf, | |
678 | size_t count) | |
679 | { | |
680 | struct viodasd_device *d; | |
681 | ||
682 | for (d = viodasd_devices; d < &viodasd_devices[MAX_DISKNO]; d++) { | |
683 | if (d->disk == NULL) | |
684 | probe_disk(d); | |
685 | } | |
686 | return count; | |
687 | } | |
688 | static DRIVER_ATTR(probe, S_IWUSR, NULL, probe_disks); | |
689 | ||
690 | static int viodasd_probe(struct vio_dev *vdev, const struct vio_device_id *id) | |
691 | { | |
692 | struct viodasd_device *d = &viodasd_devices[vdev->unit_address]; | |
693 | ||
694 | d->dev = &vdev->dev; | |
8251b4c4 | 695 | if (!probe_disk(d)) |
1da177e4 LT |
696 | return -ENODEV; |
697 | return 0; | |
698 | } | |
699 | ||
700 | static int viodasd_remove(struct vio_dev *vdev) | |
701 | { | |
702 | struct viodasd_device *d; | |
703 | ||
704 | d = &viodasd_devices[vdev->unit_address]; | |
705 | if (d->disk) { | |
706 | del_gendisk(d->disk); | |
707 | blk_cleanup_queue(d->disk->queue); | |
708 | put_disk(d->disk); | |
709 | d->disk = NULL; | |
710 | } | |
711 | d->dev = NULL; | |
712 | return 0; | |
713 | } | |
714 | ||
715 | /** | |
716 | * viodasd_device_table: Used by vio.c to match devices that we | |
717 | * support. | |
718 | */ | |
719 | static struct vio_device_id viodasd_device_table[] __devinitdata = { | |
fbabeb60 | 720 | { "block", "IBM,iSeries-viodasd" }, |
fb120da6 | 721 | { "", "" } |
1da177e4 | 722 | }; |
1da177e4 | 723 | MODULE_DEVICE_TABLE(vio, viodasd_device_table); |
915124d8 | 724 | |
1da177e4 | 725 | static struct vio_driver viodasd_driver = { |
1da177e4 LT |
726 | .id_table = viodasd_device_table, |
727 | .probe = viodasd_probe, | |
6fdf5392 SR |
728 | .remove = viodasd_remove, |
729 | .driver = { | |
730 | .name = "viodasd", | |
915124d8 | 731 | .owner = THIS_MODULE, |
6fdf5392 | 732 | } |
1da177e4 LT |
733 | }; |
734 | ||
f9df68ec SR |
735 | static int need_delete_probe; |
736 | ||
1da177e4 LT |
737 | /* |
738 | * Initialize the whole device driver. Handle module and non-module | |
739 | * versions | |
740 | */ | |
741 | static int __init viodasd_init(void) | |
742 | { | |
743 | int rc; | |
744 | ||
fb8b5007 SR |
745 | if (!firmware_has_feature(FW_FEATURE_ISERIES)) { |
746 | rc = -ENODEV; | |
747 | goto early_fail; | |
748 | } | |
749 | ||
1da177e4 LT |
750 | /* Try to open to our host lp */ |
751 | if (viopath_hostLp == HvLpIndexInvalid) | |
752 | vio_set_hostlp(); | |
753 | ||
754 | if (viopath_hostLp == HvLpIndexInvalid) { | |
755 | printk(VIOD_KERN_WARNING "invalid hosting partition\n"); | |
f9df68ec SR |
756 | rc = -EIO; |
757 | goto early_fail; | |
1da177e4 LT |
758 | } |
759 | ||
760 | printk(VIOD_KERN_INFO "vers " VIOD_VERS ", hosting partition %d\n", | |
761 | viopath_hostLp); | |
762 | ||
763 | /* register the block device */ | |
f9df68ec SR |
764 | rc = register_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME); |
765 | if (rc) { | |
1da177e4 LT |
766 | printk(VIOD_KERN_WARNING |
767 | "Unable to get major number %d for %s\n", | |
768 | VIODASD_MAJOR, VIOD_GENHD_NAME); | |
f9df68ec | 769 | goto early_fail; |
1da177e4 LT |
770 | } |
771 | /* Actually open the path to the hosting partition */ | |
f9df68ec SR |
772 | rc = viopath_open(viopath_hostLp, viomajorsubtype_blockio, |
773 | VIOMAXREQ + 2); | |
774 | if (rc) { | |
1da177e4 LT |
775 | printk(VIOD_KERN_WARNING |
776 | "error opening path to host partition %d\n", | |
777 | viopath_hostLp); | |
f9df68ec | 778 | goto unregister_blk; |
1da177e4 LT |
779 | } |
780 | ||
781 | /* Initialize our request handler */ | |
782 | vio_setHandler(viomajorsubtype_blockio, handle_block_event); | |
783 | ||
784 | rc = vio_register_driver(&viodasd_driver); | |
f9df68ec SR |
785 | if (rc) { |
786 | printk(VIOD_KERN_WARNING "vio_register_driver failed\n"); | |
787 | goto unset_handler; | |
788 | } | |
789 | ||
790 | /* | |
791 | * If this call fails, it just means that we cannot dynamically | |
792 | * add virtual disks, but the driver will still work fine for | |
793 | * all existing disk, so ignore the failure. | |
794 | */ | |
795 | if (!driver_create_file(&viodasd_driver.driver, &driver_attr_probe)) | |
796 | need_delete_probe = 1; | |
797 | ||
798 | return 0; | |
799 | ||
800 | unset_handler: | |
801 | vio_clearHandler(viomajorsubtype_blockio); | |
802 | viopath_close(viopath_hostLp, viomajorsubtype_blockio, VIOMAXREQ + 2); | |
803 | unregister_blk: | |
804 | unregister_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME); | |
805 | early_fail: | |
1da177e4 LT |
806 | return rc; |
807 | } | |
808 | module_init(viodasd_init); | |
809 | ||
f9df68ec | 810 | void __exit viodasd_exit(void) |
1da177e4 | 811 | { |
f9df68ec SR |
812 | if (need_delete_probe) |
813 | driver_remove_file(&viodasd_driver.driver, &driver_attr_probe); | |
1da177e4 LT |
814 | vio_unregister_driver(&viodasd_driver); |
815 | vio_clearHandler(viomajorsubtype_blockio); | |
1da177e4 | 816 | viopath_close(viopath_hostLp, viomajorsubtype_blockio, VIOMAXREQ + 2); |
f9df68ec | 817 | unregister_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME); |
1da177e4 | 818 | } |
1da177e4 | 819 | module_exit(viodasd_exit); |