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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> | |
8962cadb | 6 | * Stephen Rothwell |
1da177e4 LT |
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 | */ | |
dc942cee JP |
31 | |
32 | #define pr_fmt(fmt) "viod: " fmt | |
33 | ||
1da177e4 LT |
34 | #include <linux/major.h> |
35 | #include <linux/fs.h> | |
36 | #include <linux/module.h> | |
37 | #include <linux/kernel.h> | |
38 | #include <linux/blkdev.h> | |
39 | #include <linux/genhd.h> | |
40 | #include <linux/hdreg.h> | |
41 | #include <linux/errno.h> | |
42 | #include <linux/init.h> | |
43 | #include <linux/string.h> | |
6e9624b8 | 44 | #include <linux/smp_lock.h> |
1da177e4 LT |
45 | #include <linux/dma-mapping.h> |
46 | #include <linux/completion.h> | |
47 | #include <linux/device.h> | |
45711f1a | 48 | #include <linux/scatterlist.h> |
1da177e4 LT |
49 | |
50 | #include <asm/uaccess.h> | |
51 | #include <asm/vio.h> | |
1ec65d76 | 52 | #include <asm/iseries/hv_types.h> |
e45423ea | 53 | #include <asm/iseries/hv_lp_event.h> |
15b17189 | 54 | #include <asm/iseries/hv_lp_config.h> |
b4206778 | 55 | #include <asm/iseries/vio.h> |
fb8b5007 | 56 | #include <asm/firmware.h> |
1da177e4 LT |
57 | |
58 | MODULE_DESCRIPTION("iSeries Virtual DASD"); | |
59 | MODULE_AUTHOR("Dave Boutcher"); | |
60 | MODULE_LICENSE("GPL"); | |
61 | ||
62 | /* | |
63 | * We only support 7 partitions per physical disk....so with minor | |
64 | * numbers 0-255 we get a maximum of 32 disks. | |
65 | */ | |
66 | #define VIOD_GENHD_NAME "iseries/vd" | |
1da177e4 LT |
67 | |
68 | #define VIOD_VERS "1.64" | |
69 | ||
1da177e4 LT |
70 | enum { |
71 | PARTITION_SHIFT = 3, | |
72 | MAX_DISKNO = HVMAXARCHITECTEDVIRTUALDISKS, | |
ea6728c1 | 73 | MAX_DISK_NAME = FIELD_SIZEOF(struct gendisk, disk_name) |
1da177e4 LT |
74 | }; |
75 | ||
76 | static DEFINE_SPINLOCK(viodasd_spinlock); | |
77 | ||
78 | #define VIOMAXREQ 16 | |
1da177e4 LT |
79 | |
80 | #define DEVICE_NO(cell) ((struct viodasd_device *)(cell) - &viodasd_devices[0]) | |
81 | ||
1da177e4 LT |
82 | struct viodasd_waitevent { |
83 | struct completion com; | |
84 | int rc; | |
85 | u16 sub_result; | |
86 | int max_disk; /* open */ | |
87 | }; | |
88 | ||
89 | static const struct vio_error_entry viodasd_err_table[] = { | |
90 | { 0x0201, EINVAL, "Invalid Range" }, | |
91 | { 0x0202, EINVAL, "Invalid Token" }, | |
92 | { 0x0203, EIO, "DMA Error" }, | |
93 | { 0x0204, EIO, "Use Error" }, | |
94 | { 0x0205, EIO, "Release Error" }, | |
95 | { 0x0206, EINVAL, "Invalid Disk" }, | |
96 | { 0x0207, EBUSY, "Cant Lock" }, | |
97 | { 0x0208, EIO, "Already Locked" }, | |
98 | { 0x0209, EIO, "Already Unlocked" }, | |
99 | { 0x020A, EIO, "Invalid Arg" }, | |
100 | { 0x020B, EIO, "Bad IFS File" }, | |
101 | { 0x020C, EROFS, "Read Only Device" }, | |
102 | { 0x02FF, EIO, "Internal Error" }, | |
103 | { 0x0000, 0, NULL }, | |
104 | }; | |
105 | ||
106 | /* | |
107 | * Figure out the biggest I/O request (in sectors) we can accept | |
108 | */ | |
109 | #define VIODASD_MAXSECTORS (4096 / 512 * VIOMAXBLOCKDMA) | |
110 | ||
111 | /* | |
112 | * Number of disk I/O requests we've sent to OS/400 | |
113 | */ | |
114 | static int num_req_outstanding; | |
115 | ||
116 | /* | |
117 | * This is our internal structure for keeping track of disk devices | |
118 | */ | |
119 | struct viodasd_device { | |
120 | u16 cylinders; | |
121 | u16 tracks; | |
122 | u16 sectors; | |
123 | u16 bytes_per_sector; | |
124 | u64 size; | |
125 | int read_only; | |
126 | spinlock_t q_lock; | |
127 | struct gendisk *disk; | |
128 | struct device *dev; | |
129 | } viodasd_devices[MAX_DISKNO]; | |
130 | ||
131 | /* | |
132 | * External open entry point. | |
133 | */ | |
f115a14a | 134 | static int viodasd_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 135 | { |
f115a14a | 136 | struct viodasd_device *d = bdev->bd_disk->private_data; |
1da177e4 LT |
137 | HvLpEvent_Rc hvrc; |
138 | struct viodasd_waitevent we; | |
139 | u16 flags = 0; | |
140 | ||
141 | if (d->read_only) { | |
f115a14a | 142 | if (mode & FMODE_WRITE) |
1da177e4 LT |
143 | return -EROFS; |
144 | flags = vioblockflags_ro; | |
145 | } | |
146 | ||
147 | init_completion(&we.com); | |
148 | ||
149 | /* Send the open event to OS/400 */ | |
150 | hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, | |
151 | HvLpEvent_Type_VirtualIo, | |
152 | viomajorsubtype_blockio | vioblockopen, | |
153 | HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck, | |
154 | viopath_sourceinst(viopath_hostLp), | |
155 | viopath_targetinst(viopath_hostLp), | |
156 | (u64)(unsigned long)&we, VIOVERSION << 16, | |
157 | ((u64)DEVICE_NO(d) << 48) | ((u64)flags << 32), | |
158 | 0, 0, 0); | |
159 | if (hvrc != 0) { | |
dc942cee | 160 | pr_warning("HV open failed %d\n", (int)hvrc); |
1da177e4 LT |
161 | return -EIO; |
162 | } | |
163 | ||
164 | wait_for_completion(&we.com); | |
165 | ||
166 | /* Check the return code */ | |
167 | if (we.rc != 0) { | |
168 | const struct vio_error_entry *err = | |
169 | vio_lookup_rc(viodasd_err_table, we.sub_result); | |
170 | ||
dc942cee JP |
171 | pr_warning("bad rc opening disk: %d:0x%04x (%s)\n", |
172 | (int)we.rc, we.sub_result, err->msg); | |
1da177e4 LT |
173 | return -EIO; |
174 | } | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
6e9624b8 AB |
179 | static int viodasd_unlocked_open(struct block_device *bdev, fmode_t mode) |
180 | { | |
181 | int ret; | |
182 | ||
183 | lock_kernel(); | |
184 | ret = viodasd_open(bdev, mode); | |
185 | unlock_kernel(); | |
186 | ||
187 | return ret; | |
188 | } | |
189 | ||
190 | ||
1da177e4 LT |
191 | /* |
192 | * External release entry point. | |
193 | */ | |
f115a14a | 194 | static int viodasd_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 195 | { |
f115a14a | 196 | struct viodasd_device *d = disk->private_data; |
1da177e4 LT |
197 | HvLpEvent_Rc hvrc; |
198 | ||
6e9624b8 | 199 | lock_kernel(); |
1da177e4 LT |
200 | /* Send the event to OS/400. We DON'T expect a response */ |
201 | hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, | |
202 | HvLpEvent_Type_VirtualIo, | |
203 | viomajorsubtype_blockio | vioblockclose, | |
204 | HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck, | |
205 | viopath_sourceinst(viopath_hostLp), | |
206 | viopath_targetinst(viopath_hostLp), | |
207 | 0, VIOVERSION << 16, | |
208 | ((u64)DEVICE_NO(d) << 48) /* | ((u64)flags << 32) */, | |
209 | 0, 0, 0); | |
210 | if (hvrc != 0) | |
dc942cee | 211 | pr_warning("HV close call failed %d\n", (int)hvrc); |
6e9624b8 AB |
212 | |
213 | unlock_kernel(); | |
214 | ||
1da177e4 LT |
215 | return 0; |
216 | } | |
217 | ||
218 | ||
219 | /* External ioctl entry point. | |
220 | */ | |
a885c8c4 | 221 | static int viodasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1da177e4 | 222 | { |
a885c8c4 CH |
223 | struct gendisk *disk = bdev->bd_disk; |
224 | struct viodasd_device *d = disk->private_data; | |
225 | ||
36a70030 | 226 | geo->sectors = d->sectors ? d->sectors : 32; |
a885c8c4 CH |
227 | geo->heads = d->tracks ? d->tracks : 64; |
228 | geo->cylinders = d->cylinders ? d->cylinders : | |
36a70030 | 229 | get_capacity(disk) / (geo->sectors * geo->heads); |
1da177e4 | 230 | |
a885c8c4 | 231 | return 0; |
1da177e4 LT |
232 | } |
233 | ||
234 | /* | |
235 | * Our file operations table | |
236 | */ | |
83d5cde4 | 237 | static const struct block_device_operations viodasd_fops = { |
1da177e4 | 238 | .owner = THIS_MODULE, |
6e9624b8 | 239 | .open = viodasd_unlocked_open, |
f115a14a | 240 | .release = viodasd_release, |
a885c8c4 | 241 | .getgeo = viodasd_getgeo, |
1da177e4 LT |
242 | }; |
243 | ||
244 | /* | |
245 | * End a request | |
246 | */ | |
b2aec24e | 247 | static void viodasd_end_request(struct request *req, int error, |
1da177e4 LT |
248 | int num_sectors) |
249 | { | |
b2aec24e | 250 | __blk_end_request(req, error, num_sectors << 9); |
1da177e4 LT |
251 | } |
252 | ||
253 | /* | |
254 | * Send an actual I/O request to OS/400 | |
255 | */ | |
256 | static int send_request(struct request *req) | |
257 | { | |
258 | u64 start; | |
259 | int direction; | |
260 | int nsg; | |
261 | u16 viocmd; | |
262 | HvLpEvent_Rc hvrc; | |
263 | struct vioblocklpevent *bevent; | |
677f8c0d | 264 | struct HvLpEvent *hev; |
1da177e4 LT |
265 | struct scatterlist sg[VIOMAXBLOCKDMA]; |
266 | int sgindex; | |
1da177e4 LT |
267 | struct viodasd_device *d; |
268 | unsigned long flags; | |
269 | ||
83096ebf | 270 | start = (u64)blk_rq_pos(req) << 9; |
1da177e4 LT |
271 | |
272 | if (rq_data_dir(req) == READ) { | |
273 | direction = DMA_FROM_DEVICE; | |
274 | viocmd = viomajorsubtype_blockio | vioblockread; | |
1da177e4 LT |
275 | } else { |
276 | direction = DMA_TO_DEVICE; | |
277 | viocmd = viomajorsubtype_blockio | vioblockwrite; | |
1da177e4 LT |
278 | } |
279 | ||
280 | d = req->rq_disk->private_data; | |
281 | ||
282 | /* Now build the scatter-gather list */ | |
45711f1a | 283 | sg_init_table(sg, VIOMAXBLOCKDMA); |
1da177e4 LT |
284 | nsg = blk_rq_map_sg(req->q, req, sg); |
285 | nsg = dma_map_sg(d->dev, sg, nsg, direction); | |
286 | ||
287 | spin_lock_irqsave(&viodasd_spinlock, flags); | |
288 | num_req_outstanding++; | |
289 | ||
290 | /* This optimization handles a single DMA block */ | |
291 | if (nsg == 1) | |
292 | hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, | |
293 | HvLpEvent_Type_VirtualIo, viocmd, | |
294 | HvLpEvent_AckInd_DoAck, | |
295 | HvLpEvent_AckType_ImmediateAck, | |
296 | viopath_sourceinst(viopath_hostLp), | |
297 | viopath_targetinst(viopath_hostLp), | |
298 | (u64)(unsigned long)req, VIOVERSION << 16, | |
299 | ((u64)DEVICE_NO(d) << 48), start, | |
300 | ((u64)sg_dma_address(&sg[0])) << 32, | |
301 | sg_dma_len(&sg[0])); | |
302 | else { | |
303 | bevent = (struct vioblocklpevent *) | |
304 | vio_get_event_buffer(viomajorsubtype_blockio); | |
305 | if (bevent == NULL) { | |
dc942cee | 306 | pr_warning("error allocating disk event buffer\n"); |
1da177e4 LT |
307 | goto error_ret; |
308 | } | |
309 | ||
310 | /* | |
311 | * Now build up the actual request. Note that we store | |
312 | * the pointer to the request in the correlation | |
313 | * token so we can match the response up later | |
314 | */ | |
315 | memset(bevent, 0, sizeof(struct vioblocklpevent)); | |
677f8c0d SR |
316 | hev = &bevent->event; |
317 | hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DO_ACK | | |
318 | HV_LP_EVENT_INT; | |
319 | hev->xType = HvLpEvent_Type_VirtualIo; | |
320 | hev->xSubtype = viocmd; | |
321 | hev->xSourceLp = HvLpConfig_getLpIndex(); | |
322 | hev->xTargetLp = viopath_hostLp; | |
323 | hev->xSizeMinus1 = | |
1da177e4 LT |
324 | offsetof(struct vioblocklpevent, u.rw_data.dma_info) + |
325 | (sizeof(bevent->u.rw_data.dma_info[0]) * nsg) - 1; | |
677f8c0d SR |
326 | hev->xSourceInstanceId = viopath_sourceinst(viopath_hostLp); |
327 | hev->xTargetInstanceId = viopath_targetinst(viopath_hostLp); | |
328 | hev->xCorrelationToken = (u64)req; | |
1da177e4 LT |
329 | bevent->version = VIOVERSION; |
330 | bevent->disk = DEVICE_NO(d); | |
331 | bevent->u.rw_data.offset = start; | |
332 | ||
333 | /* | |
334 | * Copy just the dma information from the sg list | |
335 | * into the request | |
336 | */ | |
337 | for (sgindex = 0; sgindex < nsg; sgindex++) { | |
338 | bevent->u.rw_data.dma_info[sgindex].token = | |
339 | sg_dma_address(&sg[sgindex]); | |
340 | bevent->u.rw_data.dma_info[sgindex].len = | |
341 | sg_dma_len(&sg[sgindex]); | |
342 | } | |
343 | ||
344 | /* Send the request */ | |
345 | hvrc = HvCallEvent_signalLpEvent(&bevent->event); | |
346 | vio_free_event_buffer(viomajorsubtype_blockio, bevent); | |
347 | } | |
348 | ||
349 | if (hvrc != HvLpEvent_Rc_Good) { | |
dc942cee JP |
350 | pr_warning("error sending disk event to OS/400 (rc %d)\n", |
351 | (int)hvrc); | |
1da177e4 LT |
352 | goto error_ret; |
353 | } | |
354 | spin_unlock_irqrestore(&viodasd_spinlock, flags); | |
355 | return 0; | |
356 | ||
357 | error_ret: | |
358 | num_req_outstanding--; | |
359 | spin_unlock_irqrestore(&viodasd_spinlock, flags); | |
360 | dma_unmap_sg(d->dev, sg, nsg, direction); | |
361 | return -1; | |
362 | } | |
363 | ||
364 | /* | |
365 | * This is the external request processing routine | |
366 | */ | |
165125e1 | 367 | static void do_viodasd_request(struct request_queue *q) |
1da177e4 LT |
368 | { |
369 | struct request *req; | |
370 | ||
371 | /* | |
372 | * If we already have the maximum number of requests | |
373 | * outstanding to OS/400 just bail out. We'll come | |
374 | * back later. | |
375 | */ | |
376 | while (num_req_outstanding < VIOMAXREQ) { | |
9934c8c0 | 377 | req = blk_fetch_request(q); |
1da177e4 LT |
378 | if (req == NULL) |
379 | return; | |
1da177e4 | 380 | /* check that request contains a valid command */ |
33659ebb | 381 | if (req->cmd_type != REQ_TYPE_FS) { |
5b93629b | 382 | viodasd_end_request(req, -EIO, blk_rq_sectors(req)); |
1da177e4 LT |
383 | continue; |
384 | } | |
385 | /* Try sending the request */ | |
386 | if (send_request(req) != 0) | |
5b93629b | 387 | viodasd_end_request(req, -EIO, blk_rq_sectors(req)); |
1da177e4 LT |
388 | } |
389 | } | |
390 | ||
391 | /* | |
392 | * Probe a single disk and fill in the viodasd_device structure | |
393 | * for it. | |
394 | */ | |
8251b4c4 | 395 | static int probe_disk(struct viodasd_device *d) |
1da177e4 LT |
396 | { |
397 | HvLpEvent_Rc hvrc; | |
398 | struct viodasd_waitevent we; | |
399 | int dev_no = DEVICE_NO(d); | |
400 | struct gendisk *g; | |
401 | struct request_queue *q; | |
402 | u16 flags = 0; | |
403 | ||
404 | retry: | |
405 | init_completion(&we.com); | |
406 | ||
407 | /* Send the open event to OS/400 */ | |
408 | hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, | |
409 | HvLpEvent_Type_VirtualIo, | |
410 | viomajorsubtype_blockio | vioblockopen, | |
411 | HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck, | |
412 | viopath_sourceinst(viopath_hostLp), | |
413 | viopath_targetinst(viopath_hostLp), | |
414 | (u64)(unsigned long)&we, VIOVERSION << 16, | |
415 | ((u64)dev_no << 48) | ((u64)flags<< 32), | |
416 | 0, 0, 0); | |
417 | if (hvrc != 0) { | |
dc942cee | 418 | pr_warning("bad rc on HV open %d\n", (int)hvrc); |
8251b4c4 | 419 | return 0; |
1da177e4 LT |
420 | } |
421 | ||
422 | wait_for_completion(&we.com); | |
423 | ||
424 | if (we.rc != 0) { | |
425 | if (flags != 0) | |
8251b4c4 | 426 | return 0; |
1da177e4 LT |
427 | /* try again with read only flag set */ |
428 | flags = vioblockflags_ro; | |
429 | goto retry; | |
430 | } | |
431 | if (we.max_disk > (MAX_DISKNO - 1)) { | |
dc942cee JP |
432 | printk_once(KERN_INFO pr_fmt("Only examining the first %d of %d disks connected\n"), |
433 | MAX_DISKNO, we.max_disk + 1); | |
1da177e4 LT |
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) { | |
dc942cee | 447 | pr_warning("bad rc sending event to OS/400 %d\n", (int)hvrc); |
8251b4c4 | 448 | return 0; |
1da177e4 | 449 | } |
8251b4c4 SR |
450 | |
451 | if (d->dev == NULL) { | |
452 | /* this is when we reprobe for new disks */ | |
453 | if (vio_create_viodasd(dev_no) == NULL) { | |
dc942cee JP |
454 | pr_warning("cannot allocate virtual device for disk %d\n", |
455 | dev_no); | |
8251b4c4 SR |
456 | return 0; |
457 | } | |
458 | /* | |
459 | * The vio_create_viodasd will have recursed into this | |
460 | * routine with d->dev set to the new vio device and | |
461 | * will finish the setup of the disk below. | |
462 | */ | |
463 | return 1; | |
464 | } | |
465 | ||
1da177e4 LT |
466 | /* create the request queue for the disk */ |
467 | spin_lock_init(&d->q_lock); | |
468 | q = blk_init_queue(do_viodasd_request, &d->q_lock); | |
469 | if (q == NULL) { | |
dc942cee | 470 | pr_warning("cannot allocate queue for disk %d\n", dev_no); |
8251b4c4 | 471 | return 0; |
1da177e4 LT |
472 | } |
473 | g = alloc_disk(1 << PARTITION_SHIFT); | |
474 | if (g == NULL) { | |
dc942cee JP |
475 | pr_warning("cannot allocate disk structure for disk %d\n", |
476 | dev_no); | |
1da177e4 | 477 | blk_cleanup_queue(q); |
8251b4c4 | 478 | return 0; |
1da177e4 LT |
479 | } |
480 | ||
481 | d->disk = g; | |
8a78362c | 482 | blk_queue_max_segments(q, VIOMAXBLOCKDMA); |
086fa5ff | 483 | blk_queue_max_hw_sectors(q, VIODASD_MAXSECTORS); |
1da177e4 LT |
484 | g->major = VIODASD_MAJOR; |
485 | g->first_minor = dev_no << PARTITION_SHIFT; | |
486 | if (dev_no >= 26) | |
487 | snprintf(g->disk_name, sizeof(g->disk_name), | |
488 | VIOD_GENHD_NAME "%c%c", | |
489 | 'a' + (dev_no / 26) - 1, 'a' + (dev_no % 26)); | |
490 | else | |
491 | snprintf(g->disk_name, sizeof(g->disk_name), | |
492 | VIOD_GENHD_NAME "%c", 'a' + (dev_no % 26)); | |
1da177e4 LT |
493 | g->fops = &viodasd_fops; |
494 | g->queue = q; | |
495 | g->private_data = d; | |
496 | g->driverfs_dev = d->dev; | |
497 | set_capacity(g, d->size >> 9); | |
498 | ||
dc942cee JP |
499 | pr_info("disk %d: %lu sectors (%lu MB) CHS=%d/%d/%d sector size %d%s\n", |
500 | dev_no, (unsigned long)(d->size >> 9), | |
501 | (unsigned long)(d->size >> 20), | |
502 | (int)d->cylinders, (int)d->tracks, | |
503 | (int)d->sectors, (int)d->bytes_per_sector, | |
504 | d->read_only ? " (RO)" : ""); | |
1da177e4 LT |
505 | |
506 | /* register us in the global list */ | |
507 | add_disk(g); | |
8251b4c4 | 508 | return 1; |
1da177e4 LT |
509 | } |
510 | ||
511 | /* returns the total number of scatterlist elements converted */ | |
512 | static int block_event_to_scatterlist(const struct vioblocklpevent *bevent, | |
513 | struct scatterlist *sg, int *total_len) | |
514 | { | |
515 | int i, numsg; | |
516 | const struct rw_data *rw_data = &bevent->u.rw_data; | |
517 | static const int offset = | |
518 | offsetof(struct vioblocklpevent, u.rw_data.dma_info); | |
519 | static const int element_size = sizeof(rw_data->dma_info[0]); | |
520 | ||
521 | numsg = ((bevent->event.xSizeMinus1 + 1) - offset) / element_size; | |
522 | if (numsg > VIOMAXBLOCKDMA) | |
523 | numsg = VIOMAXBLOCKDMA; | |
524 | ||
525 | *total_len = 0; | |
25c0a7b8 | 526 | sg_init_table(sg, VIOMAXBLOCKDMA); |
1da177e4 LT |
527 | for (i = 0; (i < numsg) && (rw_data->dma_info[i].len > 0); ++i) { |
528 | sg_dma_address(&sg[i]) = rw_data->dma_info[i].token; | |
529 | sg_dma_len(&sg[i]) = rw_data->dma_info[i].len; | |
530 | *total_len += rw_data->dma_info[i].len; | |
531 | } | |
532 | return i; | |
533 | } | |
534 | ||
535 | /* | |
536 | * Restart all queues, starting with the one _after_ the disk given, | |
537 | * thus reducing the chance of starvation of higher numbered disks. | |
538 | */ | |
539 | static void viodasd_restart_all_queues_starting_from(int first_index) | |
540 | { | |
541 | int i; | |
542 | ||
543 | for (i = first_index + 1; i < MAX_DISKNO; ++i) | |
544 | if (viodasd_devices[i].disk) | |
545 | blk_run_queue(viodasd_devices[i].disk->queue); | |
546 | for (i = 0; i <= first_index; ++i) | |
547 | if (viodasd_devices[i].disk) | |
548 | blk_run_queue(viodasd_devices[i].disk->queue); | |
549 | } | |
550 | ||
551 | /* | |
552 | * For read and write requests, decrement the number of outstanding requests, | |
553 | * Free the DMA buffers we allocated. | |
554 | */ | |
555 | static int viodasd_handle_read_write(struct vioblocklpevent *bevent) | |
556 | { | |
557 | int num_sg, num_sect, pci_direction, total_len; | |
558 | struct request *req; | |
559 | struct scatterlist sg[VIOMAXBLOCKDMA]; | |
560 | struct HvLpEvent *event = &bevent->event; | |
561 | unsigned long irq_flags; | |
562 | struct viodasd_device *d; | |
563 | int error; | |
564 | spinlock_t *qlock; | |
565 | ||
566 | num_sg = block_event_to_scatterlist(bevent, sg, &total_len); | |
567 | num_sect = total_len >> 9; | |
568 | if (event->xSubtype == (viomajorsubtype_blockio | vioblockread)) | |
569 | pci_direction = DMA_FROM_DEVICE; | |
570 | else | |
571 | pci_direction = DMA_TO_DEVICE; | |
572 | req = (struct request *)bevent->event.xCorrelationToken; | |
573 | d = req->rq_disk->private_data; | |
574 | ||
575 | dma_unmap_sg(d->dev, sg, num_sg, pci_direction); | |
576 | ||
577 | /* | |
578 | * Since this is running in interrupt mode, we need to make sure | |
579 | * we're not stepping on any global I/O operations | |
580 | */ | |
581 | spin_lock_irqsave(&viodasd_spinlock, irq_flags); | |
582 | num_req_outstanding--; | |
583 | spin_unlock_irqrestore(&viodasd_spinlock, irq_flags); | |
584 | ||
b2aec24e | 585 | error = (event->xRc == HvLpEvent_Rc_Good) ? 0 : -EIO; |
1da177e4 LT |
586 | if (error) { |
587 | const struct vio_error_entry *err; | |
588 | err = vio_lookup_rc(viodasd_err_table, bevent->sub_result); | |
dc942cee JP |
589 | pr_warning("read/write error %d:0x%04x (%s)\n", |
590 | event->xRc, bevent->sub_result, err->msg); | |
5b93629b | 591 | num_sect = blk_rq_sectors(req); |
1da177e4 LT |
592 | } |
593 | qlock = req->q->queue_lock; | |
594 | spin_lock_irqsave(qlock, irq_flags); | |
b2aec24e | 595 | viodasd_end_request(req, error, num_sect); |
1da177e4 LT |
596 | spin_unlock_irqrestore(qlock, irq_flags); |
597 | ||
598 | /* Finally, try to get more requests off of this device's queue */ | |
599 | viodasd_restart_all_queues_starting_from(DEVICE_NO(d)); | |
600 | ||
601 | return 0; | |
602 | } | |
603 | ||
604 | /* This routine handles incoming block LP events */ | |
605 | static void handle_block_event(struct HvLpEvent *event) | |
606 | { | |
607 | struct vioblocklpevent *bevent = (struct vioblocklpevent *)event; | |
608 | struct viodasd_waitevent *pwe; | |
609 | ||
610 | if (event == NULL) | |
611 | /* Notification that a partition went away! */ | |
612 | return; | |
613 | /* First, we should NEVER get an int here...only acks */ | |
677f8c0d | 614 | if (hvlpevent_is_int(event)) { |
dc942cee | 615 | pr_warning("Yikes! got an int in viodasd event handler!\n"); |
677f8c0d | 616 | if (hvlpevent_need_ack(event)) { |
1da177e4 LT |
617 | event->xRc = HvLpEvent_Rc_InvalidSubtype; |
618 | HvCallEvent_ackLpEvent(event); | |
619 | } | |
620 | } | |
621 | ||
622 | switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) { | |
623 | case vioblockopen: | |
624 | /* | |
625 | * Handle a response to an open request. We get all the | |
626 | * disk information in the response, so update it. The | |
627 | * correlation token contains a pointer to a waitevent | |
628 | * structure that has a completion in it. update the | |
629 | * return code in the waitevent structure and post the | |
630 | * completion to wake up the guy who sent the request | |
631 | */ | |
632 | pwe = (struct viodasd_waitevent *)event->xCorrelationToken; | |
633 | pwe->rc = event->xRc; | |
634 | pwe->sub_result = bevent->sub_result; | |
635 | if (event->xRc == HvLpEvent_Rc_Good) { | |
636 | const struct open_data *data = &bevent->u.open_data; | |
637 | struct viodasd_device *device = | |
638 | &viodasd_devices[bevent->disk]; | |
639 | device->read_only = | |
640 | bevent->flags & vioblockflags_ro; | |
641 | device->size = data->disk_size; | |
642 | device->cylinders = data->cylinders; | |
643 | device->tracks = data->tracks; | |
644 | device->sectors = data->sectors; | |
645 | device->bytes_per_sector = data->bytes_per_sector; | |
646 | pwe->max_disk = data->max_disk; | |
647 | } | |
648 | complete(&pwe->com); | |
649 | break; | |
650 | case vioblockclose: | |
651 | break; | |
652 | case vioblockread: | |
653 | case vioblockwrite: | |
654 | viodasd_handle_read_write(bevent); | |
655 | break; | |
656 | ||
657 | default: | |
dc942cee | 658 | pr_warning("invalid subtype!"); |
677f8c0d | 659 | if (hvlpevent_need_ack(event)) { |
1da177e4 LT |
660 | event->xRc = HvLpEvent_Rc_InvalidSubtype; |
661 | HvCallEvent_ackLpEvent(event); | |
662 | } | |
663 | } | |
664 | } | |
665 | ||
666 | /* | |
667 | * Get the driver to reprobe for more disks. | |
668 | */ | |
669 | static ssize_t probe_disks(struct device_driver *drv, const char *buf, | |
670 | size_t count) | |
671 | { | |
672 | struct viodasd_device *d; | |
673 | ||
674 | for (d = viodasd_devices; d < &viodasd_devices[MAX_DISKNO]; d++) { | |
675 | if (d->disk == NULL) | |
676 | probe_disk(d); | |
677 | } | |
678 | return count; | |
679 | } | |
680 | static DRIVER_ATTR(probe, S_IWUSR, NULL, probe_disks); | |
681 | ||
682 | static int viodasd_probe(struct vio_dev *vdev, const struct vio_device_id *id) | |
683 | { | |
684 | struct viodasd_device *d = &viodasd_devices[vdev->unit_address]; | |
685 | ||
686 | d->dev = &vdev->dev; | |
8251b4c4 | 687 | if (!probe_disk(d)) |
1da177e4 LT |
688 | return -ENODEV; |
689 | return 0; | |
690 | } | |
691 | ||
692 | static int viodasd_remove(struct vio_dev *vdev) | |
693 | { | |
694 | struct viodasd_device *d; | |
695 | ||
696 | d = &viodasd_devices[vdev->unit_address]; | |
697 | if (d->disk) { | |
698 | del_gendisk(d->disk); | |
699 | blk_cleanup_queue(d->disk->queue); | |
700 | put_disk(d->disk); | |
701 | d->disk = NULL; | |
702 | } | |
703 | d->dev = NULL; | |
704 | return 0; | |
705 | } | |
706 | ||
707 | /** | |
708 | * viodasd_device_table: Used by vio.c to match devices that we | |
709 | * support. | |
710 | */ | |
711 | static struct vio_device_id viodasd_device_table[] __devinitdata = { | |
fbabeb60 | 712 | { "block", "IBM,iSeries-viodasd" }, |
fb120da6 | 713 | { "", "" } |
1da177e4 | 714 | }; |
1da177e4 | 715 | MODULE_DEVICE_TABLE(vio, viodasd_device_table); |
915124d8 | 716 | |
1da177e4 | 717 | static struct vio_driver viodasd_driver = { |
1da177e4 LT |
718 | .id_table = viodasd_device_table, |
719 | .probe = viodasd_probe, | |
6fdf5392 SR |
720 | .remove = viodasd_remove, |
721 | .driver = { | |
722 | .name = "viodasd", | |
915124d8 | 723 | .owner = THIS_MODULE, |
6fdf5392 | 724 | } |
1da177e4 LT |
725 | }; |
726 | ||
f9df68ec SR |
727 | static int need_delete_probe; |
728 | ||
1da177e4 LT |
729 | /* |
730 | * Initialize the whole device driver. Handle module and non-module | |
731 | * versions | |
732 | */ | |
733 | static int __init viodasd_init(void) | |
734 | { | |
735 | int rc; | |
736 | ||
fb8b5007 SR |
737 | if (!firmware_has_feature(FW_FEATURE_ISERIES)) { |
738 | rc = -ENODEV; | |
739 | goto early_fail; | |
740 | } | |
741 | ||
1da177e4 LT |
742 | /* Try to open to our host lp */ |
743 | if (viopath_hostLp == HvLpIndexInvalid) | |
744 | vio_set_hostlp(); | |
745 | ||
746 | if (viopath_hostLp == HvLpIndexInvalid) { | |
dc942cee | 747 | pr_warning("invalid hosting partition\n"); |
f9df68ec SR |
748 | rc = -EIO; |
749 | goto early_fail; | |
1da177e4 LT |
750 | } |
751 | ||
dc942cee | 752 | pr_info("vers " VIOD_VERS ", hosting partition %d\n", viopath_hostLp); |
1da177e4 LT |
753 | |
754 | /* register the block device */ | |
f9df68ec SR |
755 | rc = register_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME); |
756 | if (rc) { | |
dc942cee JP |
757 | pr_warning("Unable to get major number %d for %s\n", |
758 | VIODASD_MAJOR, VIOD_GENHD_NAME); | |
f9df68ec | 759 | goto early_fail; |
1da177e4 LT |
760 | } |
761 | /* Actually open the path to the hosting partition */ | |
f9df68ec SR |
762 | rc = viopath_open(viopath_hostLp, viomajorsubtype_blockio, |
763 | VIOMAXREQ + 2); | |
764 | if (rc) { | |
dc942cee JP |
765 | pr_warning("error opening path to host partition %d\n", |
766 | viopath_hostLp); | |
f9df68ec | 767 | goto unregister_blk; |
1da177e4 LT |
768 | } |
769 | ||
770 | /* Initialize our request handler */ | |
771 | vio_setHandler(viomajorsubtype_blockio, handle_block_event); | |
772 | ||
773 | rc = vio_register_driver(&viodasd_driver); | |
f9df68ec | 774 | if (rc) { |
dc942cee | 775 | pr_warning("vio_register_driver failed\n"); |
f9df68ec SR |
776 | goto unset_handler; |
777 | } | |
778 | ||
779 | /* | |
780 | * If this call fails, it just means that we cannot dynamically | |
781 | * add virtual disks, but the driver will still work fine for | |
782 | * all existing disk, so ignore the failure. | |
783 | */ | |
784 | if (!driver_create_file(&viodasd_driver.driver, &driver_attr_probe)) | |
785 | need_delete_probe = 1; | |
786 | ||
787 | return 0; | |
788 | ||
789 | unset_handler: | |
790 | vio_clearHandler(viomajorsubtype_blockio); | |
791 | viopath_close(viopath_hostLp, viomajorsubtype_blockio, VIOMAXREQ + 2); | |
792 | unregister_blk: | |
793 | unregister_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME); | |
794 | early_fail: | |
1da177e4 LT |
795 | return rc; |
796 | } | |
797 | module_init(viodasd_init); | |
798 | ||
f9df68ec | 799 | void __exit viodasd_exit(void) |
1da177e4 | 800 | { |
f9df68ec SR |
801 | if (need_delete_probe) |
802 | driver_remove_file(&viodasd_driver.driver, &driver_attr_probe); | |
1da177e4 LT |
803 | vio_unregister_driver(&viodasd_driver); |
804 | vio_clearHandler(viomajorsubtype_blockio); | |
1da177e4 | 805 | viopath_close(viopath_hostLp, viomajorsubtype_blockio, VIOMAXREQ + 2); |
f9df68ec | 806 | unregister_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME); |
1da177e4 | 807 | } |
1da177e4 | 808 | module_exit(viodasd_exit); |