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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[linux/fpc-iii.git] / drivers / s390 / virtio / virtio_ccw.c
blobf8d8fdb26b72a593260fa67b98337414a684e9b5
1 /*
2 * ccw based virtio transport
3 *
4 * Copyright IBM Corp. 2012, 2014
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License (version 2 only)
8 * as published by the Free Software Foundation.
9 *
10 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
11 */
12
13 #include <linux/kernel_stat.h>
14 #include <linux/init.h>
15 #include <linux/bootmem.h>
16 #include <linux/err.h>
17 #include <linux/virtio.h>
18 #include <linux/virtio_config.h>
19 #include <linux/slab.h>
20 #include <linux/interrupt.h>
21 #include <linux/virtio_ring.h>
22 #include <linux/pfn.h>
23 #include <linux/async.h>
24 #include <linux/wait.h>
25 #include <linux/list.h>
26 #include <linux/bitops.h>
27 #include <linux/module.h>
28 #include <linux/io.h>
29 #include <linux/kvm_para.h>
30 #include <linux/notifier.h>
31 #include <asm/setup.h>
32 #include <asm/irq.h>
33 #include <asm/cio.h>
34 #include <asm/ccwdev.h>
35 #include <asm/virtio-ccw.h>
36 #include <asm/isc.h>
37 #include <asm/airq.h>
38
39 /*
40 * virtio related functions
41 */
42
43 struct vq_config_block {
44 __u16 index;
45 __u16 num;
46 } __packed;
47
48 #define VIRTIO_CCW_CONFIG_SIZE 0x100
49 /* same as PCI config space size, should be enough for all drivers */
50
51 struct virtio_ccw_device {
52 struct virtio_device vdev;
53 __u8 *status;
54 __u8 config[VIRTIO_CCW_CONFIG_SIZE];
55 struct ccw_device *cdev;
56 __u32 curr_io;
57 int err;
58 unsigned int revision; /* Transport revision */
59 wait_queue_head_t wait_q;
60 spinlock_t lock;
61 struct list_head virtqueues;
62 unsigned long indicators;
63 unsigned long indicators2;
64 struct vq_config_block *config_block;
65 bool is_thinint;
66 bool going_away;
67 bool device_lost;
68 unsigned int config_ready;
69 void *airq_info;
70 };
71
72 struct vq_info_block_legacy {
73 __u64 queue;
74 __u32 align;
75 __u16 index;
76 __u16 num;
77 } __packed;
78
79 struct vq_info_block {
80 __u64 desc;
81 __u32 res0;
82 __u16 index;
83 __u16 num;
84 __u64 avail;
85 __u64 used;
86 } __packed;
87
88 struct virtio_feature_desc {
89 __u32 features;
90 __u8 index;
91 } __packed;
92
93 struct virtio_thinint_area {
94 unsigned long summary_indicator;
95 unsigned long indicator;
96 u64 bit_nr;
97 u8 isc;
98 } __packed;
99
100 struct virtio_rev_info {
101 __u16 revision;
102 __u16 length;
103 __u8 data[];
104 };
105
106 /* the highest virtio-ccw revision we support */
107 #define VIRTIO_CCW_REV_MAX 1
108
109 struct virtio_ccw_vq_info {
110 struct virtqueue *vq;
111 int num;
112 void *queue;
113 union {
114 struct vq_info_block s;
115 struct vq_info_block_legacy l;
116 } *info_block;
117 int bit_nr;
118 struct list_head node;
119 long cookie;
120 };
121
122 #define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */
123
124 #define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8)
125 #define MAX_AIRQ_AREAS 20
126
127 static int virtio_ccw_use_airq = 1;
128
129 struct airq_info {
130 rwlock_t lock;
131 u8 summary_indicator;
132 struct airq_struct airq;
133 struct airq_iv *aiv;
134 };
135 static struct airq_info *airq_areas[MAX_AIRQ_AREAS];
136
137 #define CCW_CMD_SET_VQ 0x13
138 #define CCW_CMD_VDEV_RESET 0x33
139 #define CCW_CMD_SET_IND 0x43
140 #define CCW_CMD_SET_CONF_IND 0x53
141 #define CCW_CMD_READ_FEAT 0x12
142 #define CCW_CMD_WRITE_FEAT 0x11
143 #define CCW_CMD_READ_CONF 0x22
144 #define CCW_CMD_WRITE_CONF 0x21
145 #define CCW_CMD_WRITE_STATUS 0x31
146 #define CCW_CMD_READ_VQ_CONF 0x32
147 #define CCW_CMD_SET_IND_ADAPTER 0x73
148 #define CCW_CMD_SET_VIRTIO_REV 0x83
149
150 #define VIRTIO_CCW_DOING_SET_VQ 0x00010000
151 #define VIRTIO_CCW_DOING_RESET 0x00040000
152 #define VIRTIO_CCW_DOING_READ_FEAT 0x00080000
153 #define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000
154 #define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000
155 #define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000
156 #define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000
157 #define VIRTIO_CCW_DOING_SET_IND 0x01000000
158 #define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000
159 #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000
160 #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000
161 #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000
162 #define VIRTIO_CCW_INTPARM_MASK 0xffff0000
163
164 static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev)
165 {
166 return container_of(vdev, struct virtio_ccw_device, vdev);
167 }
168
169 static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info)
170 {
171 unsigned long i, flags;
172
173 write_lock_irqsave(&info->lock, flags);
174 for (i = 0; i < airq_iv_end(info->aiv); i++) {
175 if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) {
176 airq_iv_free_bit(info->aiv, i);
177 airq_iv_set_ptr(info->aiv, i, 0);
178 break;
179 }
180 }
181 write_unlock_irqrestore(&info->lock, flags);
182 }
183
184 static void virtio_airq_handler(struct airq_struct *airq)
185 {
186 struct airq_info *info = container_of(airq, struct airq_info, airq);
187 unsigned long ai;
188
189 inc_irq_stat(IRQIO_VAI);
190 read_lock(&info->lock);
191 /* Walk through indicators field, summary indicator active. */
192 for (ai = 0;;) {
193 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv));
194 if (ai == -1UL)
195 break;
196 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai));
197 }
198 info->summary_indicator = 0;
199 smp_wmb();
200 /* Walk through indicators field, summary indicator not active. */
201 for (ai = 0;;) {
202 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv));
203 if (ai == -1UL)
204 break;
205 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai));
206 }
207 read_unlock(&info->lock);
208 }
209
210 static struct airq_info *new_airq_info(void)
211 {
212 struct airq_info *info;
213 int rc;
214
215 info = kzalloc(sizeof(*info), GFP_KERNEL);
216 if (!info)
217 return NULL;
218 rwlock_init(&info->lock);
219 info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR);
220 if (!info->aiv) {
221 kfree(info);
222 return NULL;
223 }
224 info->airq.handler = virtio_airq_handler;
225 info->airq.lsi_ptr = &info->summary_indicator;
226 info->airq.lsi_mask = 0xff;
227 info->airq.isc = VIRTIO_AIRQ_ISC;
228 rc = register_adapter_interrupt(&info->airq);
229 if (rc) {
230 airq_iv_release(info->aiv);
231 kfree(info);
232 return NULL;
233 }
234 return info;
235 }
236
237 static void destroy_airq_info(struct airq_info *info)
238 {
239 if (!info)
240 return;
241
242 unregister_adapter_interrupt(&info->airq);
243 airq_iv_release(info->aiv);
244 kfree(info);
245 }
246
247 static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs,
248 u64 *first, void **airq_info)
249 {
250 int i, j;
251 struct airq_info *info;
252 unsigned long indicator_addr = 0;
253 unsigned long bit, flags;
254
255 for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) {
256 if (!airq_areas[i])
257 airq_areas[i] = new_airq_info();
258 info = airq_areas[i];
259 if (!info)
260 return 0;
261 write_lock_irqsave(&info->lock, flags);
262 bit = airq_iv_alloc(info->aiv, nvqs);
263 if (bit == -1UL) {
264 /* Not enough vacancies. */
265 write_unlock_irqrestore(&info->lock, flags);
266 continue;
267 }
268 *first = bit;
269 *airq_info = info;
270 indicator_addr = (unsigned long)info->aiv->vector;
271 for (j = 0; j < nvqs; j++) {
272 airq_iv_set_ptr(info->aiv, bit + j,
273 (unsigned long)vqs[j]);
274 }
275 write_unlock_irqrestore(&info->lock, flags);
276 }
277 return indicator_addr;
278 }
279
280 static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev)
281 {
282 struct virtio_ccw_vq_info *info;
283
284 list_for_each_entry(info, &vcdev->virtqueues, node)
285 drop_airq_indicator(info->vq, vcdev->airq_info);
286 }
287
288 static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag)
289 {
290 unsigned long flags;
291 __u32 ret;
292
293 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
294 if (vcdev->err)
295 ret = 0;
296 else
297 ret = vcdev->curr_io & flag;
298 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
299 return ret;
300 }
301
302 static int ccw_io_helper(struct virtio_ccw_device *vcdev,
303 struct ccw1 *ccw, __u32 intparm)
304 {
305 int ret;
306 unsigned long flags;
307 int flag = intparm & VIRTIO_CCW_INTPARM_MASK;
308
309 do {
310 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
311 ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0);
312 if (!ret) {
313 if (!vcdev->curr_io)
314 vcdev->err = 0;
315 vcdev->curr_io |= flag;
316 }
317 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
318 cpu_relax();
319 } while (ret == -EBUSY);
320 wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0);
321 return ret ? ret : vcdev->err;
322 }
323
324 static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev,
325 struct ccw1 *ccw)
326 {
327 int ret;
328 unsigned long *indicatorp = NULL;
329 struct virtio_thinint_area *thinint_area = NULL;
330 struct airq_info *airq_info = vcdev->airq_info;
331
332 if (vcdev->is_thinint) {
333 thinint_area = kzalloc(sizeof(*thinint_area),
334 GFP_DMA | GFP_KERNEL);
335 if (!thinint_area)
336 return;
337 thinint_area->summary_indicator =
338 (unsigned long) &airq_info->summary_indicator;
339 thinint_area->isc = VIRTIO_AIRQ_ISC;
340 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
341 ccw->count = sizeof(*thinint_area);
342 ccw->cda = (__u32)(unsigned long) thinint_area;
343 } else {
344 indicatorp = kmalloc(sizeof(&vcdev->indicators),
345 GFP_DMA | GFP_KERNEL);
346 if (!indicatorp)
347 return;
348 *indicatorp = 0;
349 ccw->cmd_code = CCW_CMD_SET_IND;
350 ccw->count = sizeof(vcdev->indicators);
351 ccw->cda = (__u32)(unsigned long) indicatorp;
352 }
353 /* Deregister indicators from host. */
354 vcdev->indicators = 0;
355 ccw->flags = 0;
356 ret = ccw_io_helper(vcdev, ccw,
357 vcdev->is_thinint ?
358 VIRTIO_CCW_DOING_SET_IND_ADAPTER :
359 VIRTIO_CCW_DOING_SET_IND);
360 if (ret && (ret != -ENODEV))
361 dev_info(&vcdev->cdev->dev,
362 "Failed to deregister indicators (%d)\n", ret);
363 else if (vcdev->is_thinint)
364 virtio_ccw_drop_indicators(vcdev);
365 kfree(indicatorp);
366 kfree(thinint_area);
367 }
368
369 static inline long do_kvm_notify(struct subchannel_id schid,
370 unsigned long queue_index,
371 long cookie)
372 {
373 register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY;
374 register struct subchannel_id __schid asm("2") = schid;
375 register unsigned long __index asm("3") = queue_index;
376 register long __rc asm("2");
377 register long __cookie asm("4") = cookie;
378
379 asm volatile ("diag 2,4,0x500\n"
380 : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index),
381 "d"(__cookie)
382 : "memory", "cc");
383 return __rc;
384 }
385
386 static bool virtio_ccw_kvm_notify(struct virtqueue *vq)
387 {
388 struct virtio_ccw_vq_info *info = vq->priv;
389 struct virtio_ccw_device *vcdev;
390 struct subchannel_id schid;
391
392 vcdev = to_vc_device(info->vq->vdev);
393 ccw_device_get_schid(vcdev->cdev, &schid);
394 info->cookie = do_kvm_notify(schid, vq->index, info->cookie);
395 if (info->cookie < 0)
396 return false;
397 return true;
398 }
399
400 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev,
401 struct ccw1 *ccw, int index)
402 {
403 vcdev->config_block->index = index;
404 ccw->cmd_code = CCW_CMD_READ_VQ_CONF;
405 ccw->flags = 0;
406 ccw->count = sizeof(struct vq_config_block);
407 ccw->cda = (__u32)(unsigned long)(vcdev->config_block);
408 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF);
409 return vcdev->config_block->num;
410 }
411
412 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw)
413 {
414 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev);
415 struct virtio_ccw_vq_info *info = vq->priv;
416 unsigned long flags;
417 unsigned long size;
418 int ret;
419 unsigned int index = vq->index;
420
421 /* Remove from our list. */
422 spin_lock_irqsave(&vcdev->lock, flags);
423 list_del(&info->node);
424 spin_unlock_irqrestore(&vcdev->lock, flags);
425
426 /* Release from host. */
427 if (vcdev->revision == 0) {
428 info->info_block->l.queue = 0;
429 info->info_block->l.align = 0;
430 info->info_block->l.index = index;
431 info->info_block->l.num = 0;
432 ccw->count = sizeof(info->info_block->l);
433 } else {
434 info->info_block->s.desc = 0;
435 info->info_block->s.index = index;
436 info->info_block->s.num = 0;
437 info->info_block->s.avail = 0;
438 info->info_block->s.used = 0;
439 ccw->count = sizeof(info->info_block->s);
440 }
441 ccw->cmd_code = CCW_CMD_SET_VQ;
442 ccw->flags = 0;
443 ccw->cda = (__u32)(unsigned long)(info->info_block);
444 ret = ccw_io_helper(vcdev, ccw,
445 VIRTIO_CCW_DOING_SET_VQ | index);
446 /*
447 * -ENODEV isn't considered an error: The device is gone anyway.
448 * This may happen on device detach.
449 */
450 if (ret && (ret != -ENODEV))
451 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d",
452 ret, index);
453
454 vring_del_virtqueue(vq);
455 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
456 free_pages_exact(info->queue, size);
457 kfree(info->info_block);
458 kfree(info);
459 }
460
461 static void virtio_ccw_del_vqs(struct virtio_device *vdev)
462 {
463 struct virtqueue *vq, *n;
464 struct ccw1 *ccw;
465 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
466
467 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
468 if (!ccw)
469 return;
470
471 virtio_ccw_drop_indicator(vcdev, ccw);
472
473 list_for_each_entry_safe(vq, n, &vdev->vqs, list)
474 virtio_ccw_del_vq(vq, ccw);
475
476 kfree(ccw);
477 }
478
479 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
480 int i, vq_callback_t *callback,
481 const char *name,
482 struct ccw1 *ccw)
483 {
484 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
485 int err;
486 struct virtqueue *vq = NULL;
487 struct virtio_ccw_vq_info *info;
488 unsigned long size = 0; /* silence the compiler */
489 unsigned long flags;
490
491 /* Allocate queue. */
492 info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL);
493 if (!info) {
494 dev_warn(&vcdev->cdev->dev, "no info\n");
495 err = -ENOMEM;
496 goto out_err;
497 }
498 info->info_block = kzalloc(sizeof(*info->info_block),
499 GFP_DMA | GFP_KERNEL);
500 if (!info->info_block) {
501 dev_warn(&vcdev->cdev->dev, "no info block\n");
502 err = -ENOMEM;
503 goto out_err;
504 }
505 info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i);
506 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
507 info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
508 if (info->queue == NULL) {
509 dev_warn(&vcdev->cdev->dev, "no queue\n");
510 err = -ENOMEM;
511 goto out_err;
512 }
513
514 vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev,
515 true, info->queue, virtio_ccw_kvm_notify,
516 callback, name);
517 if (!vq) {
518 /* For now, we fail if we can't get the requested size. */
519 dev_warn(&vcdev->cdev->dev, "no vq\n");
520 err = -ENOMEM;
521 goto out_err;
522 }
523
524 /* Register it with the host. */
525 if (vcdev->revision == 0) {
526 info->info_block->l.queue = (__u64)info->queue;
527 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN;
528 info->info_block->l.index = i;
529 info->info_block->l.num = info->num;
530 ccw->count = sizeof(info->info_block->l);
531 } else {
532 info->info_block->s.desc = (__u64)info->queue;
533 info->info_block->s.index = i;
534 info->info_block->s.num = info->num;
535 info->info_block->s.avail = (__u64)virtqueue_get_avail(vq);
536 info->info_block->s.used = (__u64)virtqueue_get_used(vq);
537 ccw->count = sizeof(info->info_block->s);
538 }
539 ccw->cmd_code = CCW_CMD_SET_VQ;
540 ccw->flags = 0;
541 ccw->cda = (__u32)(unsigned long)(info->info_block);
542 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i);
543 if (err) {
544 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n");
545 goto out_err;
546 }
547
548 info->vq = vq;
549 vq->priv = info;
550
551 /* Save it to our list. */
552 spin_lock_irqsave(&vcdev->lock, flags);
553 list_add(&info->node, &vcdev->virtqueues);
554 spin_unlock_irqrestore(&vcdev->lock, flags);
555
556 return vq;
557
558 out_err:
559 if (vq)
560 vring_del_virtqueue(vq);
561 if (info) {
562 if (info->queue)
563 free_pages_exact(info->queue, size);
564 kfree(info->info_block);
565 }
566 kfree(info);
567 return ERR_PTR(err);
568 }
569
570 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev,
571 struct virtqueue *vqs[], int nvqs,
572 struct ccw1 *ccw)
573 {
574 int ret;
575 struct virtio_thinint_area *thinint_area = NULL;
576 struct airq_info *info;
577
578 thinint_area = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL);
579 if (!thinint_area) {
580 ret = -ENOMEM;
581 goto out;
582 }
583 /* Try to get an indicator. */
584 thinint_area->indicator = get_airq_indicator(vqs, nvqs,
585 &thinint_area->bit_nr,
586 &vcdev->airq_info);
587 if (!thinint_area->indicator) {
588 ret = -ENOSPC;
589 goto out;
590 }
591 info = vcdev->airq_info;
592 thinint_area->summary_indicator =
593 (unsigned long) &info->summary_indicator;
594 thinint_area->isc = VIRTIO_AIRQ_ISC;
595 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
596 ccw->flags = CCW_FLAG_SLI;
597 ccw->count = sizeof(*thinint_area);
598 ccw->cda = (__u32)(unsigned long)thinint_area;
599 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER);
600 if (ret) {
601 if (ret == -EOPNOTSUPP) {
602 /*
603 * The host does not support adapter interrupts
604 * for virtio-ccw, stop trying.
605 */
606 virtio_ccw_use_airq = 0;
607 pr_info("Adapter interrupts unsupported on host\n");
608 } else
609 dev_warn(&vcdev->cdev->dev,
610 "enabling adapter interrupts = %d\n", ret);
611 virtio_ccw_drop_indicators(vcdev);
612 }
613 out:
614 kfree(thinint_area);
615 return ret;
616 }
617
618 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
619 struct virtqueue *vqs[],
620 vq_callback_t *callbacks[],
621 const char *names[])
622 {
623 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
624 unsigned long *indicatorp = NULL;
625 int ret, i;
626 struct ccw1 *ccw;
627
628 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
629 if (!ccw)
630 return -ENOMEM;
631
632 for (i = 0; i < nvqs; ++i) {
633 vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i],
634 ccw);
635 if (IS_ERR(vqs[i])) {
636 ret = PTR_ERR(vqs[i]);
637 vqs[i] = NULL;
638 goto out;
639 }
640 }
641 ret = -ENOMEM;
642 /* We need a data area under 2G to communicate. */
643 indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL);
644 if (!indicatorp)
645 goto out;
646 *indicatorp = (unsigned long) &vcdev->indicators;
647 if (vcdev->is_thinint) {
648 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw);
649 if (ret)
650 /* no error, just fall back to legacy interrupts */
651 vcdev->is_thinint = 0;
652 }
653 if (!vcdev->is_thinint) {
654 /* Register queue indicators with host. */
655 vcdev->indicators = 0;
656 ccw->cmd_code = CCW_CMD_SET_IND;
657 ccw->flags = 0;
658 ccw->count = sizeof(vcdev->indicators);
659 ccw->cda = (__u32)(unsigned long) indicatorp;
660 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND);
661 if (ret)
662 goto out;
663 }
664 /* Register indicators2 with host for config changes */
665 *indicatorp = (unsigned long) &vcdev->indicators2;
666 vcdev->indicators2 = 0;
667 ccw->cmd_code = CCW_CMD_SET_CONF_IND;
668 ccw->flags = 0;
669 ccw->count = sizeof(vcdev->indicators2);
670 ccw->cda = (__u32)(unsigned long) indicatorp;
671 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND);
672 if (ret)
673 goto out;
674
675 kfree(indicatorp);
676 kfree(ccw);
677 return 0;
678 out:
679 kfree(indicatorp);
680 kfree(ccw);
681 virtio_ccw_del_vqs(vdev);
682 return ret;
683 }
684
685 static void virtio_ccw_reset(struct virtio_device *vdev)
686 {
687 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
688 struct ccw1 *ccw;
689
690 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
691 if (!ccw)
692 return;
693
694 /* Zero status bits. */
695 *vcdev->status = 0;
696
697 /* Send a reset ccw on device. */
698 ccw->cmd_code = CCW_CMD_VDEV_RESET;
699 ccw->flags = 0;
700 ccw->count = 0;
701 ccw->cda = 0;
702 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET);
703 kfree(ccw);
704 }
705
706 static u64 virtio_ccw_get_features(struct virtio_device *vdev)
707 {
708 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
709 struct virtio_feature_desc *features;
710 int ret;
711 u64 rc;
712 struct ccw1 *ccw;
713
714 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
715 if (!ccw)
716 return 0;
717
718 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
719 if (!features) {
720 rc = 0;
721 goto out_free;
722 }
723 /* Read the feature bits from the host. */
724 features->index = 0;
725 ccw->cmd_code = CCW_CMD_READ_FEAT;
726 ccw->flags = 0;
727 ccw->count = sizeof(*features);
728 ccw->cda = (__u32)(unsigned long)features;
729 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
730 if (ret) {
731 rc = 0;
732 goto out_free;
733 }
734
735 rc = le32_to_cpu(features->features);
736
737 if (vcdev->revision == 0)
738 goto out_free;
739
740 /* Read second half of the feature bits from the host. */
741 features->index = 1;
742 ccw->cmd_code = CCW_CMD_READ_FEAT;
743 ccw->flags = 0;
744 ccw->count = sizeof(*features);
745 ccw->cda = (__u32)(unsigned long)features;
746 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
747 if (ret == 0)
748 rc |= (u64)le32_to_cpu(features->features) << 32;
749
750 out_free:
751 kfree(features);
752 kfree(ccw);
753 return rc;
754 }
755
756 static int virtio_ccw_finalize_features(struct virtio_device *vdev)
757 {
758 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
759 struct virtio_feature_desc *features;
760 struct ccw1 *ccw;
761 int ret;
762
763 if (vcdev->revision >= 1 &&
764 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
765 dev_err(&vdev->dev, "virtio: device uses revision 1 "
766 "but does not have VIRTIO_F_VERSION_1\n");
767 return -EINVAL;
768 }
769
770 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
771 if (!ccw)
772 return -ENOMEM;
773
774 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
775 if (!features) {
776 ret = -ENOMEM;
777 goto out_free;
778 }
779 /* Give virtio_ring a chance to accept features. */
780 vring_transport_features(vdev);
781
782 features->index = 0;
783 features->features = cpu_to_le32((u32)vdev->features);
784 /* Write the first half of the feature bits to the host. */
785 ccw->cmd_code = CCW_CMD_WRITE_FEAT;
786 ccw->flags = 0;
787 ccw->count = sizeof(*features);
788 ccw->cda = (__u32)(unsigned long)features;
789 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
790 if (ret)
791 goto out_free;
792
793 if (vcdev->revision == 0)
794 goto out_free;
795
796 features->index = 1;
797 features->features = cpu_to_le32(vdev->features >> 32);
798 /* Write the second half of the feature bits to the host. */
799 ccw->cmd_code = CCW_CMD_WRITE_FEAT;
800 ccw->flags = 0;
801 ccw->count = sizeof(*features);
802 ccw->cda = (__u32)(unsigned long)features;
803 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
804
805 out_free:
806 kfree(features);
807 kfree(ccw);
808
809 return ret;
810 }
811
812 static void virtio_ccw_get_config(struct virtio_device *vdev,
813 unsigned int offset, void *buf, unsigned len)
814 {
815 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
816 int ret;
817 struct ccw1 *ccw;
818 void *config_area;
819
820 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
821 if (!ccw)
822 return;
823
824 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
825 if (!config_area)
826 goto out_free;
827
828 /* Read the config area from the host. */
829 ccw->cmd_code = CCW_CMD_READ_CONF;
830 ccw->flags = 0;
831 ccw->count = offset + len;
832 ccw->cda = (__u32)(unsigned long)config_area;
833 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG);
834 if (ret)
835 goto out_free;
836
837 memcpy(vcdev->config, config_area, offset + len);
838 if (buf)
839 memcpy(buf, &vcdev->config[offset], len);
840 if (vcdev->config_ready < offset + len)
841 vcdev->config_ready = offset + len;
842
843 out_free:
844 kfree(config_area);
845 kfree(ccw);
846 }
847
848 static void virtio_ccw_set_config(struct virtio_device *vdev,
849 unsigned int offset, const void *buf,
850 unsigned len)
851 {
852 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
853 struct ccw1 *ccw;
854 void *config_area;
855
856 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
857 if (!ccw)
858 return;
859
860 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
861 if (!config_area)
862 goto out_free;
863
864 /* Make sure we don't overwrite fields. */
865 if (vcdev->config_ready < offset)
866 virtio_ccw_get_config(vdev, 0, NULL, offset);
867 memcpy(&vcdev->config[offset], buf, len);
868 /* Write the config area to the host. */
869 memcpy(config_area, vcdev->config, sizeof(vcdev->config));
870 ccw->cmd_code = CCW_CMD_WRITE_CONF;
871 ccw->flags = 0;
872 ccw->count = offset + len;
873 ccw->cda = (__u32)(unsigned long)config_area;
874 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG);
875
876 out_free:
877 kfree(config_area);
878 kfree(ccw);
879 }
880
881 static u8 virtio_ccw_get_status(struct virtio_device *vdev)
882 {
883 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
884
885 return *vcdev->status;
886 }
887
888 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status)
889 {
890 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
891 u8 old_status = *vcdev->status;
892 struct ccw1 *ccw;
893 int ret;
894
895 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
896 if (!ccw)
897 return;
898
899 /* Write the status to the host. */
900 *vcdev->status = status;
901 ccw->cmd_code = CCW_CMD_WRITE_STATUS;
902 ccw->flags = 0;
903 ccw->count = sizeof(status);
904 ccw->cda = (__u32)(unsigned long)vcdev->status;
905 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS);
906 /* Write failed? We assume status is unchanged. */
907 if (ret)
908 *vcdev->status = old_status;
909 kfree(ccw);
910 }
911
912 static struct virtio_config_ops virtio_ccw_config_ops = {
913 .get_features = virtio_ccw_get_features,
914 .finalize_features = virtio_ccw_finalize_features,
915 .get = virtio_ccw_get_config,
916 .set = virtio_ccw_set_config,
917 .get_status = virtio_ccw_get_status,
918 .set_status = virtio_ccw_set_status,
919 .reset = virtio_ccw_reset,
920 .find_vqs = virtio_ccw_find_vqs,
921 .del_vqs = virtio_ccw_del_vqs,
922 };
923
924
925 /*
926 * ccw bus driver related functions
927 */
928
929 static void virtio_ccw_release_dev(struct device *_d)
930 {
931 struct virtio_device *dev = container_of(_d, struct virtio_device,
932 dev);
933 struct virtio_ccw_device *vcdev = to_vc_device(dev);
934
935 kfree(vcdev->status);
936 kfree(vcdev->config_block);
937 kfree(vcdev);
938 }
939
940 static int irb_is_error(struct irb *irb)
941 {
942 if (scsw_cstat(&irb->scsw) != 0)
943 return 1;
944 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))
945 return 1;
946 if (scsw_cc(&irb->scsw) != 0)
947 return 1;
948 return 0;
949 }
950
951 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev,
952 int index)
953 {
954 struct virtio_ccw_vq_info *info;
955 unsigned long flags;
956 struct virtqueue *vq;
957
958 vq = NULL;
959 spin_lock_irqsave(&vcdev->lock, flags);
960 list_for_each_entry(info, &vcdev->virtqueues, node) {
961 if (info->vq->index == index) {
962 vq = info->vq;
963 break;
964 }
965 }
966 spin_unlock_irqrestore(&vcdev->lock, flags);
967 return vq;
968 }
969
970 static void virtio_ccw_int_handler(struct ccw_device *cdev,
971 unsigned long intparm,
972 struct irb *irb)
973 {
974 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK;
975 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
976 int i;
977 struct virtqueue *vq;
978
979 if (!vcdev)
980 return;
981 /* Check if it's a notification from the host. */
982 if ((intparm == 0) &&
983 (scsw_stctl(&irb->scsw) ==
984 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) {
985 /* OK */
986 }
987 if (irb_is_error(irb)) {
988 /* Command reject? */
989 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
990 (irb->ecw[0] & SNS0_CMD_REJECT))
991 vcdev->err = -EOPNOTSUPP;
992 else
993 /* Map everything else to -EIO. */
994 vcdev->err = -EIO;
995 }
996 if (vcdev->curr_io & activity) {
997 switch (activity) {
998 case VIRTIO_CCW_DOING_READ_FEAT:
999 case VIRTIO_CCW_DOING_WRITE_FEAT:
1000 case VIRTIO_CCW_DOING_READ_CONFIG:
1001 case VIRTIO_CCW_DOING_WRITE_CONFIG:
1002 case VIRTIO_CCW_DOING_WRITE_STATUS:
1003 case VIRTIO_CCW_DOING_SET_VQ:
1004 case VIRTIO_CCW_DOING_SET_IND:
1005 case VIRTIO_CCW_DOING_SET_CONF_IND:
1006 case VIRTIO_CCW_DOING_RESET:
1007 case VIRTIO_CCW_DOING_READ_VQ_CONF:
1008 case VIRTIO_CCW_DOING_SET_IND_ADAPTER:
1009 case VIRTIO_CCW_DOING_SET_VIRTIO_REV:
1010 vcdev->curr_io &= ~activity;
1011 wake_up(&vcdev->wait_q);
1012 break;
1013 default:
1014 /* don't know what to do... */
1015 dev_warn(&cdev->dev, "Suspicious activity '%08x'\n",
1016 activity);
1017 WARN_ON(1);
1018 break;
1019 }
1020 }
1021 for_each_set_bit(i, &vcdev->indicators,
1022 sizeof(vcdev->indicators) * BITS_PER_BYTE) {
1023 /* The bit clear must happen before the vring kick. */
1024 clear_bit(i, &vcdev->indicators);
1025 barrier();
1026 vq = virtio_ccw_vq_by_ind(vcdev, i);
1027 vring_interrupt(0, vq);
1028 }
1029 if (test_bit(0, &vcdev->indicators2)) {
1030 virtio_config_changed(&vcdev->vdev);
1031 clear_bit(0, &vcdev->indicators2);
1032 }
1033 }
1034
1035 /*
1036 * We usually want to autoonline all devices, but give the admin
1037 * a way to exempt devices from this.
1038 */
1039 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
1040 (8*sizeof(long)))
1041 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS];
1042
1043 static char *no_auto = "";
1044
1045 module_param(no_auto, charp, 0444);
1046 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined");
1047
1048 static int virtio_ccw_check_autoonline(struct ccw_device *cdev)
1049 {
1050 struct ccw_dev_id id;
1051
1052 ccw_device_get_id(cdev, &id);
1053 if (test_bit(id.devno, devs_no_auto[id.ssid]))
1054 return 0;
1055 return 1;
1056 }
1057
1058 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie)
1059 {
1060 struct ccw_device *cdev = data;
1061 int ret;
1062
1063 ret = ccw_device_set_online(cdev);
1064 if (ret)
1065 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret);
1066 }
1067
1068 static int virtio_ccw_probe(struct ccw_device *cdev)
1069 {
1070 cdev->handler = virtio_ccw_int_handler;
1071
1072 if (virtio_ccw_check_autoonline(cdev))
1073 async_schedule(virtio_ccw_auto_online, cdev);
1074 return 0;
1075 }
1076
1077 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev)
1078 {
1079 unsigned long flags;
1080 struct virtio_ccw_device *vcdev;
1081
1082 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1083 vcdev = dev_get_drvdata(&cdev->dev);
1084 if (!vcdev || vcdev->going_away) {
1085 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1086 return NULL;
1087 }
1088 vcdev->going_away = true;
1089 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1090 return vcdev;
1091 }
1092
1093 static void virtio_ccw_remove(struct ccw_device *cdev)
1094 {
1095 unsigned long flags;
1096 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1097
1098 if (vcdev && cdev->online) {
1099 if (vcdev->device_lost)
1100 virtio_break_device(&vcdev->vdev);
1101 unregister_virtio_device(&vcdev->vdev);
1102 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1103 dev_set_drvdata(&cdev->dev, NULL);
1104 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1105 }
1106 cdev->handler = NULL;
1107 }
1108
1109 static int virtio_ccw_offline(struct ccw_device *cdev)
1110 {
1111 unsigned long flags;
1112 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1113
1114 if (!vcdev)
1115 return 0;
1116 if (vcdev->device_lost)
1117 virtio_break_device(&vcdev->vdev);
1118 unregister_virtio_device(&vcdev->vdev);
1119 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1120 dev_set_drvdata(&cdev->dev, NULL);
1121 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1122 return 0;
1123 }
1124
1125 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev)
1126 {
1127 struct virtio_rev_info *rev;
1128 struct ccw1 *ccw;
1129 int ret;
1130
1131 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
1132 if (!ccw)
1133 return -ENOMEM;
1134 rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL);
1135 if (!rev) {
1136 kfree(ccw);
1137 return -ENOMEM;
1138 }
1139
1140 /* Set transport revision */
1141 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV;
1142 ccw->flags = 0;
1143 ccw->count = sizeof(*rev);
1144 ccw->cda = (__u32)(unsigned long)rev;
1145
1146 vcdev->revision = VIRTIO_CCW_REV_MAX;
1147 do {
1148 rev->revision = vcdev->revision;
1149 /* none of our supported revisions carry payload */
1150 rev->length = 0;
1151 ret = ccw_io_helper(vcdev, ccw,
1152 VIRTIO_CCW_DOING_SET_VIRTIO_REV);
1153 if (ret == -EOPNOTSUPP) {
1154 if (vcdev->revision == 0)
1155 /*
1156 * The host device does not support setting
1157 * the revision: let's operate it in legacy
1158 * mode.
1159 */
1160 ret = 0;
1161 else
1162 vcdev->revision--;
1163 }
1164 } while (ret == -EOPNOTSUPP);
1165
1166 kfree(ccw);
1167 kfree(rev);
1168 return ret;
1169 }
1170
1171 static int virtio_ccw_online(struct ccw_device *cdev)
1172 {
1173 int ret;
1174 struct virtio_ccw_device *vcdev;
1175 unsigned long flags;
1176
1177 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL);
1178 if (!vcdev) {
1179 dev_warn(&cdev->dev, "Could not get memory for virtio\n");
1180 ret = -ENOMEM;
1181 goto out_free;
1182 }
1183 vcdev->config_block = kzalloc(sizeof(*vcdev->config_block),
1184 GFP_DMA | GFP_KERNEL);
1185 if (!vcdev->config_block) {
1186 ret = -ENOMEM;
1187 goto out_free;
1188 }
1189 vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL);
1190 if (!vcdev->status) {
1191 ret = -ENOMEM;
1192 goto out_free;
1193 }
1194
1195 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */
1196
1197 vcdev->vdev.dev.parent = &cdev->dev;
1198 vcdev->vdev.dev.release = virtio_ccw_release_dev;
1199 vcdev->vdev.config = &virtio_ccw_config_ops;
1200 vcdev->cdev = cdev;
1201 init_waitqueue_head(&vcdev->wait_q);
1202 INIT_LIST_HEAD(&vcdev->virtqueues);
1203 spin_lock_init(&vcdev->lock);
1204
1205 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1206 dev_set_drvdata(&cdev->dev, vcdev);
1207 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1208 vcdev->vdev.id.vendor = cdev->id.cu_type;
1209 vcdev->vdev.id.device = cdev->id.cu_model;
1210
1211 ret = virtio_ccw_set_transport_rev(vcdev);
1212 if (ret)
1213 goto out_free;
1214
1215 ret = register_virtio_device(&vcdev->vdev);
1216 if (ret) {
1217 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n",
1218 ret);
1219 goto out_put;
1220 }
1221 return 0;
1222 out_put:
1223 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1224 dev_set_drvdata(&cdev->dev, NULL);
1225 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1226 put_device(&vcdev->vdev.dev);
1227 return ret;
1228 out_free:
1229 if (vcdev) {
1230 kfree(vcdev->status);
1231 kfree(vcdev->config_block);
1232 }
1233 kfree(vcdev);
1234 return ret;
1235 }
1236
1237 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event)
1238 {
1239 int rc;
1240 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1241
1242 /*
1243 * Make sure vcdev is set
1244 * i.e. set_offline/remove callback not already running
1245 */
1246 if (!vcdev)
1247 return NOTIFY_DONE;
1248
1249 switch (event) {
1250 case CIO_GONE:
1251 vcdev->device_lost = true;
1252 rc = NOTIFY_DONE;
1253 break;
1254 default:
1255 rc = NOTIFY_DONE;
1256 break;
1257 }
1258 return rc;
1259 }
1260
1261 static struct ccw_device_id virtio_ids[] = {
1262 { CCW_DEVICE(0x3832, 0) },
1263 {},
1264 };
1265 MODULE_DEVICE_TABLE(ccw, virtio_ids);
1266
1267 static struct ccw_driver virtio_ccw_driver = {
1268 .driver = {
1269 .owner = THIS_MODULE,
1270 .name = "virtio_ccw",
1271 },
1272 .ids = virtio_ids,
1273 .probe = virtio_ccw_probe,
1274 .remove = virtio_ccw_remove,
1275 .set_offline = virtio_ccw_offline,
1276 .set_online = virtio_ccw_online,
1277 .notify = virtio_ccw_cio_notify,
1278 .int_class = IRQIO_VIR,
1279 };
1280
1281 static int __init pure_hex(char **cp, unsigned int *val, int min_digit,
1282 int max_digit, int max_val)
1283 {
1284 int diff;
1285
1286 diff = 0;
1287 *val = 0;
1288
1289 while (diff <= max_digit) {
1290 int value = hex_to_bin(**cp);
1291
1292 if (value < 0)
1293 break;
1294 *val = *val * 16 + value;
1295 (*cp)++;
1296 diff++;
1297 }
1298
1299 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
1300 return 1;
1301
1302 return 0;
1303 }
1304
1305 static int __init parse_busid(char *str, unsigned int *cssid,
1306 unsigned int *ssid, unsigned int *devno)
1307 {
1308 char *str_work;
1309 int rc, ret;
1310
1311 rc = 1;
1312
1313 if (*str == '\0')
1314 goto out;
1315
1316 str_work = str;
1317 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
1318 if (ret || (str_work[0] != '.'))
1319 goto out;
1320 str_work++;
1321 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
1322 if (ret || (str_work[0] != '.'))
1323 goto out;
1324 str_work++;
1325 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
1326 if (ret || (str_work[0] != '\0'))
1327 goto out;
1328
1329 rc = 0;
1330 out:
1331 return rc;
1332 }
1333
1334 static void __init no_auto_parse(void)
1335 {
1336 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
1337 char *parm, *str;
1338 int rc;
1339
1340 str = no_auto;
1341 while ((parm = strsep(&str, ","))) {
1342 rc = parse_busid(strsep(&parm, "-"), &from_cssid,
1343 &from_ssid, &from);
1344 if (rc)
1345 continue;
1346 if (parm != NULL) {
1347 rc = parse_busid(parm, &to_cssid,
1348 &to_ssid, &to);
1349 if ((from_ssid > to_ssid) ||
1350 ((from_ssid == to_ssid) && (from > to)))
1351 rc = -EINVAL;
1352 } else {
1353 to_cssid = from_cssid;
1354 to_ssid = from_ssid;
1355 to = from;
1356 }
1357 if (rc)
1358 continue;
1359 while ((from_ssid < to_ssid) ||
1360 ((from_ssid == to_ssid) && (from <= to))) {
1361 set_bit(from, devs_no_auto[from_ssid]);
1362 from++;
1363 if (from > __MAX_SUBCHANNEL) {
1364 from_ssid++;
1365 from = 0;
1366 }
1367 }
1368 }
1369 }
1370
1371 static int __init virtio_ccw_init(void)
1372 {
1373 /* parse no_auto string before we do anything further */
1374 no_auto_parse();
1375 return ccw_driver_register(&virtio_ccw_driver);
1376 }
1377 module_init(virtio_ccw_init);
1378
1379 static void __exit virtio_ccw_exit(void)
1380 {
1381 int i;
1382
1383 ccw_driver_unregister(&virtio_ccw_driver);
1384 for (i = 0; i < MAX_AIRQ_AREAS; i++)
1385 destroy_airq_info(airq_areas[i]);
1386 }
1387 module_exit(virtio_ccw_exit);
Linux with added FPC-III support