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b2a1a81e6fc8f048c202b7eca54b2b0b6c22b368
[deliverable/linux.git] / drivers / s390 / virtio / virtio_ccw.c
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/diag.h>
32 #include <asm/setup.h>
33 #include <asm/irq.h>
34 #include <asm/cio.h>
35 #include <asm/ccwdev.h>
36 #include <asm/virtio-ccw.h>
37 #include <asm/isc.h>
38 #include <asm/airq.h>
39
40 /*
41 * virtio related functions
42 */
43
44 struct vq_config_block {
45 __u16 index;
46 __u16 num;
47 } __packed;
48
49 #define VIRTIO_CCW_CONFIG_SIZE 0x100
50 /* same as PCI config space size, should be enough for all drivers */
51
52 struct virtio_ccw_device {
53 struct virtio_device vdev;
54 __u8 *status;
55 __u8 config[VIRTIO_CCW_CONFIG_SIZE];
56 struct ccw_device *cdev;
57 __u32 curr_io;
58 int err;
59 unsigned int revision; /* Transport revision */
60 wait_queue_head_t wait_q;
61 spinlock_t lock;
62 struct list_head virtqueues;
63 unsigned long indicators;
64 unsigned long indicators2;
65 struct vq_config_block *config_block;
66 bool is_thinint;
67 bool going_away;
68 bool device_lost;
69 unsigned int config_ready;
70 void *airq_info;
71 };
72
73 struct vq_info_block_legacy {
74 __u64 queue;
75 __u32 align;
76 __u16 index;
77 __u16 num;
78 } __packed;
79
80 struct vq_info_block {
81 __u64 desc;
82 __u32 res0;
83 __u16 index;
84 __u16 num;
85 __u64 avail;
86 __u64 used;
87 } __packed;
88
89 struct virtio_feature_desc {
90 __u32 features;
91 __u8 index;
92 } __packed;
93
94 struct virtio_thinint_area {
95 unsigned long summary_indicator;
96 unsigned long indicator;
97 u64 bit_nr;
98 u8 isc;
99 } __packed;
100
101 struct virtio_rev_info {
102 __u16 revision;
103 __u16 length;
104 __u8 data[];
105 };
106
107 /* the highest virtio-ccw revision we support */
108 #define VIRTIO_CCW_REV_MAX 1
109
110 struct virtio_ccw_vq_info {
111 struct virtqueue *vq;
112 int num;
113 void *queue;
114 union {
115 struct vq_info_block s;
116 struct vq_info_block_legacy l;
117 } *info_block;
118 int bit_nr;
119 struct list_head node;
120 long cookie;
121 };
122
123 #define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */
124
125 #define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8)
126 #define MAX_AIRQ_AREAS 20
127
128 static int virtio_ccw_use_airq = 1;
129
130 struct airq_info {
131 rwlock_t lock;
132 u8 summary_indicator;
133 struct airq_struct airq;
134 struct airq_iv *aiv;
135 };
136 static struct airq_info *airq_areas[MAX_AIRQ_AREAS];
137
138 #define CCW_CMD_SET_VQ 0x13
139 #define CCW_CMD_VDEV_RESET 0x33
140 #define CCW_CMD_SET_IND 0x43
141 #define CCW_CMD_SET_CONF_IND 0x53
142 #define CCW_CMD_READ_FEAT 0x12
143 #define CCW_CMD_WRITE_FEAT 0x11
144 #define CCW_CMD_READ_CONF 0x22
145 #define CCW_CMD_WRITE_CONF 0x21
146 #define CCW_CMD_WRITE_STATUS 0x31
147 #define CCW_CMD_READ_VQ_CONF 0x32
148 #define CCW_CMD_SET_IND_ADAPTER 0x73
149 #define CCW_CMD_SET_VIRTIO_REV 0x83
150
151 #define VIRTIO_CCW_DOING_SET_VQ 0x00010000
152 #define VIRTIO_CCW_DOING_RESET 0x00040000
153 #define VIRTIO_CCW_DOING_READ_FEAT 0x00080000
154 #define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000
155 #define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000
156 #define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000
157 #define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000
158 #define VIRTIO_CCW_DOING_SET_IND 0x01000000
159 #define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000
160 #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000
161 #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000
162 #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000
163 #define VIRTIO_CCW_INTPARM_MASK 0xffff0000
164
165 static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev)
166 {
167 return container_of(vdev, struct virtio_ccw_device, vdev);
168 }
169
170 static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info)
171 {
172 unsigned long i, flags;
173
174 write_lock_irqsave(&info->lock, flags);
175 for (i = 0; i < airq_iv_end(info->aiv); i++) {
176 if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) {
177 airq_iv_free_bit(info->aiv, i);
178 airq_iv_set_ptr(info->aiv, i, 0);
179 break;
180 }
181 }
182 write_unlock_irqrestore(&info->lock, flags);
183 }
184
185 static void virtio_airq_handler(struct airq_struct *airq)
186 {
187 struct airq_info *info = container_of(airq, struct airq_info, airq);
188 unsigned long ai;
189
190 inc_irq_stat(IRQIO_VAI);
191 read_lock(&info->lock);
192 /* Walk through indicators field, summary indicator active. */
193 for (ai = 0;;) {
194 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv));
195 if (ai == -1UL)
196 break;
197 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai));
198 }
199 info->summary_indicator = 0;
200 smp_wmb();
201 /* Walk through indicators field, summary indicator not active. */
202 for (ai = 0;;) {
203 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv));
204 if (ai == -1UL)
205 break;
206 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai));
207 }
208 read_unlock(&info->lock);
209 }
210
211 static struct airq_info *new_airq_info(void)
212 {
213 struct airq_info *info;
214 int rc;
215
216 info = kzalloc(sizeof(*info), GFP_KERNEL);
217 if (!info)
218 return NULL;
219 rwlock_init(&info->lock);
220 info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR);
221 if (!info->aiv) {
222 kfree(info);
223 return NULL;
224 }
225 info->airq.handler = virtio_airq_handler;
226 info->airq.lsi_ptr = &info->summary_indicator;
227 info->airq.lsi_mask = 0xff;
228 info->airq.isc = VIRTIO_AIRQ_ISC;
229 rc = register_adapter_interrupt(&info->airq);
230 if (rc) {
231 airq_iv_release(info->aiv);
232 kfree(info);
233 return NULL;
234 }
235 return info;
236 }
237
238 static void destroy_airq_info(struct airq_info *info)
239 {
240 if (!info)
241 return;
242
243 unregister_adapter_interrupt(&info->airq);
244 airq_iv_release(info->aiv);
245 kfree(info);
246 }
247
248 static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs,
249 u64 *first, void **airq_info)
250 {
251 int i, j;
252 struct airq_info *info;
253 unsigned long indicator_addr = 0;
254 unsigned long bit, flags;
255
256 for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) {
257 if (!airq_areas[i])
258 airq_areas[i] = new_airq_info();
259 info = airq_areas[i];
260 if (!info)
261 return 0;
262 write_lock_irqsave(&info->lock, flags);
263 bit = airq_iv_alloc(info->aiv, nvqs);
264 if (bit == -1UL) {
265 /* Not enough vacancies. */
266 write_unlock_irqrestore(&info->lock, flags);
267 continue;
268 }
269 *first = bit;
270 *airq_info = info;
271 indicator_addr = (unsigned long)info->aiv->vector;
272 for (j = 0; j < nvqs; j++) {
273 airq_iv_set_ptr(info->aiv, bit + j,
274 (unsigned long)vqs[j]);
275 }
276 write_unlock_irqrestore(&info->lock, flags);
277 }
278 return indicator_addr;
279 }
280
281 static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev)
282 {
283 struct virtio_ccw_vq_info *info;
284
285 list_for_each_entry(info, &vcdev->virtqueues, node)
286 drop_airq_indicator(info->vq, vcdev->airq_info);
287 }
288
289 static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag)
290 {
291 unsigned long flags;
292 __u32 ret;
293
294 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
295 if (vcdev->err)
296 ret = 0;
297 else
298 ret = vcdev->curr_io & flag;
299 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
300 return ret;
301 }
302
303 static int ccw_io_helper(struct virtio_ccw_device *vcdev,
304 struct ccw1 *ccw, __u32 intparm)
305 {
306 int ret;
307 unsigned long flags;
308 int flag = intparm & VIRTIO_CCW_INTPARM_MASK;
309
310 do {
311 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
312 ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0);
313 if (!ret) {
314 if (!vcdev->curr_io)
315 vcdev->err = 0;
316 vcdev->curr_io |= flag;
317 }
318 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
319 cpu_relax();
320 } while (ret == -EBUSY);
321 wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0);
322 return ret ? ret : vcdev->err;
323 }
324
325 static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev,
326 struct ccw1 *ccw)
327 {
328 int ret;
329 unsigned long *indicatorp = NULL;
330 struct virtio_thinint_area *thinint_area = NULL;
331 struct airq_info *airq_info = vcdev->airq_info;
332
333 if (vcdev->is_thinint) {
334 thinint_area = kzalloc(sizeof(*thinint_area),
335 GFP_DMA | GFP_KERNEL);
336 if (!thinint_area)
337 return;
338 thinint_area->summary_indicator =
339 (unsigned long) &airq_info->summary_indicator;
340 thinint_area->isc = VIRTIO_AIRQ_ISC;
341 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
342 ccw->count = sizeof(*thinint_area);
343 ccw->cda = (__u32)(unsigned long) thinint_area;
344 } else {
345 indicatorp = kmalloc(sizeof(&vcdev->indicators),
346 GFP_DMA | GFP_KERNEL);
347 if (!indicatorp)
348 return;
349 *indicatorp = 0;
350 ccw->cmd_code = CCW_CMD_SET_IND;
351 ccw->count = sizeof(vcdev->indicators);
352 ccw->cda = (__u32)(unsigned long) indicatorp;
353 }
354 /* Deregister indicators from host. */
355 vcdev->indicators = 0;
356 ccw->flags = 0;
357 ret = ccw_io_helper(vcdev, ccw,
358 vcdev->is_thinint ?
359 VIRTIO_CCW_DOING_SET_IND_ADAPTER :
360 VIRTIO_CCW_DOING_SET_IND);
361 if (ret && (ret != -ENODEV))
362 dev_info(&vcdev->cdev->dev,
363 "Failed to deregister indicators (%d)\n", ret);
364 else if (vcdev->is_thinint)
365 virtio_ccw_drop_indicators(vcdev);
366 kfree(indicatorp);
367 kfree(thinint_area);
368 }
369
370 static inline long __do_kvm_notify(struct subchannel_id schid,
371 unsigned long queue_index,
372 long cookie)
373 {
374 register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY;
375 register struct subchannel_id __schid asm("2") = schid;
376 register unsigned long __index asm("3") = queue_index;
377 register long __rc asm("2");
378 register long __cookie asm("4") = cookie;
379
380 asm volatile ("diag 2,4,0x500\n"
381 : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index),
382 "d"(__cookie)
383 : "memory", "cc");
384 return __rc;
385 }
386
387 static inline long do_kvm_notify(struct subchannel_id schid,
388 unsigned long queue_index,
389 long cookie)
390 {
391 diag_stat_inc(DIAG_STAT_X500);
392 return __do_kvm_notify(schid, queue_index, cookie);
393 }
394
395 static bool virtio_ccw_kvm_notify(struct virtqueue *vq)
396 {
397 struct virtio_ccw_vq_info *info = vq->priv;
398 struct virtio_ccw_device *vcdev;
399 struct subchannel_id schid;
400
401 vcdev = to_vc_device(info->vq->vdev);
402 ccw_device_get_schid(vcdev->cdev, &schid);
403 info->cookie = do_kvm_notify(schid, vq->index, info->cookie);
404 if (info->cookie < 0)
405 return false;
406 return true;
407 }
408
409 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev,
410 struct ccw1 *ccw, int index)
411 {
412 int ret;
413
414 vcdev->config_block->index = index;
415 ccw->cmd_code = CCW_CMD_READ_VQ_CONF;
416 ccw->flags = 0;
417 ccw->count = sizeof(struct vq_config_block);
418 ccw->cda = (__u32)(unsigned long)(vcdev->config_block);
419 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF);
420 if (ret)
421 return ret;
422 return vcdev->config_block->num;
423 }
424
425 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw)
426 {
427 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev);
428 struct virtio_ccw_vq_info *info = vq->priv;
429 unsigned long flags;
430 unsigned long size;
431 int ret;
432 unsigned int index = vq->index;
433
434 /* Remove from our list. */
435 spin_lock_irqsave(&vcdev->lock, flags);
436 list_del(&info->node);
437 spin_unlock_irqrestore(&vcdev->lock, flags);
438
439 /* Release from host. */
440 if (vcdev->revision == 0) {
441 info->info_block->l.queue = 0;
442 info->info_block->l.align = 0;
443 info->info_block->l.index = index;
444 info->info_block->l.num = 0;
445 ccw->count = sizeof(info->info_block->l);
446 } else {
447 info->info_block->s.desc = 0;
448 info->info_block->s.index = index;
449 info->info_block->s.num = 0;
450 info->info_block->s.avail = 0;
451 info->info_block->s.used = 0;
452 ccw->count = sizeof(info->info_block->s);
453 }
454 ccw->cmd_code = CCW_CMD_SET_VQ;
455 ccw->flags = 0;
456 ccw->cda = (__u32)(unsigned long)(info->info_block);
457 ret = ccw_io_helper(vcdev, ccw,
458 VIRTIO_CCW_DOING_SET_VQ | index);
459 /*
460 * -ENODEV isn't considered an error: The device is gone anyway.
461 * This may happen on device detach.
462 */
463 if (ret && (ret != -ENODEV))
464 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d",
465 ret, index);
466
467 vring_del_virtqueue(vq);
468 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
469 free_pages_exact(info->queue, size);
470 kfree(info->info_block);
471 kfree(info);
472 }
473
474 static void virtio_ccw_del_vqs(struct virtio_device *vdev)
475 {
476 struct virtqueue *vq, *n;
477 struct ccw1 *ccw;
478 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
479
480 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
481 if (!ccw)
482 return;
483
484 virtio_ccw_drop_indicator(vcdev, ccw);
485
486 list_for_each_entry_safe(vq, n, &vdev->vqs, list)
487 virtio_ccw_del_vq(vq, ccw);
488
489 kfree(ccw);
490 }
491
492 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
493 int i, vq_callback_t *callback,
494 const char *name,
495 struct ccw1 *ccw)
496 {
497 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
498 int err;
499 struct virtqueue *vq = NULL;
500 struct virtio_ccw_vq_info *info;
501 unsigned long size = 0; /* silence the compiler */
502 unsigned long flags;
503
504 /* Allocate queue. */
505 info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL);
506 if (!info) {
507 dev_warn(&vcdev->cdev->dev, "no info\n");
508 err = -ENOMEM;
509 goto out_err;
510 }
511 info->info_block = kzalloc(sizeof(*info->info_block),
512 GFP_DMA | GFP_KERNEL);
513 if (!info->info_block) {
514 dev_warn(&vcdev->cdev->dev, "no info block\n");
515 err = -ENOMEM;
516 goto out_err;
517 }
518 info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i);
519 if (info->num < 0) {
520 err = info->num;
521 goto out_err;
522 }
523 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
524 info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
525 if (info->queue == NULL) {
526 dev_warn(&vcdev->cdev->dev, "no queue\n");
527 err = -ENOMEM;
528 goto out_err;
529 }
530
531 vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev,
532 true, info->queue, virtio_ccw_kvm_notify,
533 callback, name);
534 if (!vq) {
535 /* For now, we fail if we can't get the requested size. */
536 dev_warn(&vcdev->cdev->dev, "no vq\n");
537 err = -ENOMEM;
538 goto out_err;
539 }
540
541 /* Register it with the host. */
542 if (vcdev->revision == 0) {
543 info->info_block->l.queue = (__u64)info->queue;
544 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN;
545 info->info_block->l.index = i;
546 info->info_block->l.num = info->num;
547 ccw->count = sizeof(info->info_block->l);
548 } else {
549 info->info_block->s.desc = (__u64)info->queue;
550 info->info_block->s.index = i;
551 info->info_block->s.num = info->num;
552 info->info_block->s.avail = (__u64)virtqueue_get_avail(vq);
553 info->info_block->s.used = (__u64)virtqueue_get_used(vq);
554 ccw->count = sizeof(info->info_block->s);
555 }
556 ccw->cmd_code = CCW_CMD_SET_VQ;
557 ccw->flags = 0;
558 ccw->cda = (__u32)(unsigned long)(info->info_block);
559 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i);
560 if (err) {
561 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n");
562 goto out_err;
563 }
564
565 info->vq = vq;
566 vq->priv = info;
567
568 /* Save it to our list. */
569 spin_lock_irqsave(&vcdev->lock, flags);
570 list_add(&info->node, &vcdev->virtqueues);
571 spin_unlock_irqrestore(&vcdev->lock, flags);
572
573 return vq;
574
575 out_err:
576 if (vq)
577 vring_del_virtqueue(vq);
578 if (info) {
579 if (info->queue)
580 free_pages_exact(info->queue, size);
581 kfree(info->info_block);
582 }
583 kfree(info);
584 return ERR_PTR(err);
585 }
586
587 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev,
588 struct virtqueue *vqs[], int nvqs,
589 struct ccw1 *ccw)
590 {
591 int ret;
592 struct virtio_thinint_area *thinint_area = NULL;
593 struct airq_info *info;
594
595 thinint_area = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL);
596 if (!thinint_area) {
597 ret = -ENOMEM;
598 goto out;
599 }
600 /* Try to get an indicator. */
601 thinint_area->indicator = get_airq_indicator(vqs, nvqs,
602 &thinint_area->bit_nr,
603 &vcdev->airq_info);
604 if (!thinint_area->indicator) {
605 ret = -ENOSPC;
606 goto out;
607 }
608 info = vcdev->airq_info;
609 thinint_area->summary_indicator =
610 (unsigned long) &info->summary_indicator;
611 thinint_area->isc = VIRTIO_AIRQ_ISC;
612 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
613 ccw->flags = CCW_FLAG_SLI;
614 ccw->count = sizeof(*thinint_area);
615 ccw->cda = (__u32)(unsigned long)thinint_area;
616 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER);
617 if (ret) {
618 if (ret == -EOPNOTSUPP) {
619 /*
620 * The host does not support adapter interrupts
621 * for virtio-ccw, stop trying.
622 */
623 virtio_ccw_use_airq = 0;
624 pr_info("Adapter interrupts unsupported on host\n");
625 } else
626 dev_warn(&vcdev->cdev->dev,
627 "enabling adapter interrupts = %d\n", ret);
628 virtio_ccw_drop_indicators(vcdev);
629 }
630 out:
631 kfree(thinint_area);
632 return ret;
633 }
634
635 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
636 struct virtqueue *vqs[],
637 vq_callback_t *callbacks[],
638 const char *names[])
639 {
640 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
641 unsigned long *indicatorp = NULL;
642 int ret, i;
643 struct ccw1 *ccw;
644
645 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
646 if (!ccw)
647 return -ENOMEM;
648
649 for (i = 0; i < nvqs; ++i) {
650 vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i],
651 ccw);
652 if (IS_ERR(vqs[i])) {
653 ret = PTR_ERR(vqs[i]);
654 vqs[i] = NULL;
655 goto out;
656 }
657 }
658 ret = -ENOMEM;
659 /* We need a data area under 2G to communicate. */
660 indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL);
661 if (!indicatorp)
662 goto out;
663 *indicatorp = (unsigned long) &vcdev->indicators;
664 if (vcdev->is_thinint) {
665 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw);
666 if (ret)
667 /* no error, just fall back to legacy interrupts */
668 vcdev->is_thinint = 0;
669 }
670 if (!vcdev->is_thinint) {
671 /* Register queue indicators with host. */
672 vcdev->indicators = 0;
673 ccw->cmd_code = CCW_CMD_SET_IND;
674 ccw->flags = 0;
675 ccw->count = sizeof(vcdev->indicators);
676 ccw->cda = (__u32)(unsigned long) indicatorp;
677 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND);
678 if (ret)
679 goto out;
680 }
681 /* Register indicators2 with host for config changes */
682 *indicatorp = (unsigned long) &vcdev->indicators2;
683 vcdev->indicators2 = 0;
684 ccw->cmd_code = CCW_CMD_SET_CONF_IND;
685 ccw->flags = 0;
686 ccw->count = sizeof(vcdev->indicators2);
687 ccw->cda = (__u32)(unsigned long) indicatorp;
688 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND);
689 if (ret)
690 goto out;
691
692 kfree(indicatorp);
693 kfree(ccw);
694 return 0;
695 out:
696 kfree(indicatorp);
697 kfree(ccw);
698 virtio_ccw_del_vqs(vdev);
699 return ret;
700 }
701
702 static void virtio_ccw_reset(struct virtio_device *vdev)
703 {
704 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
705 struct ccw1 *ccw;
706
707 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
708 if (!ccw)
709 return;
710
711 /* Zero status bits. */
712 *vcdev->status = 0;
713
714 /* Send a reset ccw on device. */
715 ccw->cmd_code = CCW_CMD_VDEV_RESET;
716 ccw->flags = 0;
717 ccw->count = 0;
718 ccw->cda = 0;
719 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET);
720 kfree(ccw);
721 }
722
723 static u64 virtio_ccw_get_features(struct virtio_device *vdev)
724 {
725 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
726 struct virtio_feature_desc *features;
727 int ret;
728 u64 rc;
729 struct ccw1 *ccw;
730
731 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
732 if (!ccw)
733 return 0;
734
735 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
736 if (!features) {
737 rc = 0;
738 goto out_free;
739 }
740 /* Read the feature bits from the host. */
741 features->index = 0;
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) {
748 rc = 0;
749 goto out_free;
750 }
751
752 rc = le32_to_cpu(features->features);
753
754 if (vcdev->revision == 0)
755 goto out_free;
756
757 /* Read second half of the feature bits from the host. */
758 features->index = 1;
759 ccw->cmd_code = CCW_CMD_READ_FEAT;
760 ccw->flags = 0;
761 ccw->count = sizeof(*features);
762 ccw->cda = (__u32)(unsigned long)features;
763 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
764 if (ret == 0)
765 rc |= (u64)le32_to_cpu(features->features) << 32;
766
767 out_free:
768 kfree(features);
769 kfree(ccw);
770 return rc;
771 }
772
773 static int virtio_ccw_finalize_features(struct virtio_device *vdev)
774 {
775 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
776 struct virtio_feature_desc *features;
777 struct ccw1 *ccw;
778 int ret;
779
780 if (vcdev->revision >= 1 &&
781 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
782 dev_err(&vdev->dev, "virtio: device uses revision 1 "
783 "but does not have VIRTIO_F_VERSION_1\n");
784 return -EINVAL;
785 }
786
787 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
788 if (!ccw)
789 return -ENOMEM;
790
791 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
792 if (!features) {
793 ret = -ENOMEM;
794 goto out_free;
795 }
796 /* Give virtio_ring a chance to accept features. */
797 vring_transport_features(vdev);
798
799 features->index = 0;
800 features->features = cpu_to_le32((u32)vdev->features);
801 /* Write the first half of the feature bits to the host. */
802 ccw->cmd_code = CCW_CMD_WRITE_FEAT;
803 ccw->flags = 0;
804 ccw->count = sizeof(*features);
805 ccw->cda = (__u32)(unsigned long)features;
806 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
807 if (ret)
808 goto out_free;
809
810 if (vcdev->revision == 0)
811 goto out_free;
812
813 features->index = 1;
814 features->features = cpu_to_le32(vdev->features >> 32);
815 /* Write the second half of the feature bits to the host. */
816 ccw->cmd_code = CCW_CMD_WRITE_FEAT;
817 ccw->flags = 0;
818 ccw->count = sizeof(*features);
819 ccw->cda = (__u32)(unsigned long)features;
820 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
821
822 out_free:
823 kfree(features);
824 kfree(ccw);
825
826 return ret;
827 }
828
829 static void virtio_ccw_get_config(struct virtio_device *vdev,
830 unsigned int offset, void *buf, unsigned len)
831 {
832 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
833 int ret;
834 struct ccw1 *ccw;
835 void *config_area;
836
837 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
838 if (!ccw)
839 return;
840
841 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
842 if (!config_area)
843 goto out_free;
844
845 /* Read the config area from the host. */
846 ccw->cmd_code = CCW_CMD_READ_CONF;
847 ccw->flags = 0;
848 ccw->count = offset + len;
849 ccw->cda = (__u32)(unsigned long)config_area;
850 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG);
851 if (ret)
852 goto out_free;
853
854 memcpy(vcdev->config, config_area, offset + len);
855 if (buf)
856 memcpy(buf, &vcdev->config[offset], len);
857 if (vcdev->config_ready < offset + len)
858 vcdev->config_ready = offset + len;
859
860 out_free:
861 kfree(config_area);
862 kfree(ccw);
863 }
864
865 static void virtio_ccw_set_config(struct virtio_device *vdev,
866 unsigned int offset, const void *buf,
867 unsigned len)
868 {
869 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
870 struct ccw1 *ccw;
871 void *config_area;
872
873 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
874 if (!ccw)
875 return;
876
877 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
878 if (!config_area)
879 goto out_free;
880
881 /* Make sure we don't overwrite fields. */
882 if (vcdev->config_ready < offset)
883 virtio_ccw_get_config(vdev, 0, NULL, offset);
884 memcpy(&vcdev->config[offset], buf, len);
885 /* Write the config area to the host. */
886 memcpy(config_area, vcdev->config, sizeof(vcdev->config));
887 ccw->cmd_code = CCW_CMD_WRITE_CONF;
888 ccw->flags = 0;
889 ccw->count = offset + len;
890 ccw->cda = (__u32)(unsigned long)config_area;
891 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG);
892
893 out_free:
894 kfree(config_area);
895 kfree(ccw);
896 }
897
898 static u8 virtio_ccw_get_status(struct virtio_device *vdev)
899 {
900 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
901
902 return *vcdev->status;
903 }
904
905 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status)
906 {
907 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
908 u8 old_status = *vcdev->status;
909 struct ccw1 *ccw;
910 int ret;
911
912 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
913 if (!ccw)
914 return;
915
916 /* Write the status to the host. */
917 *vcdev->status = status;
918 ccw->cmd_code = CCW_CMD_WRITE_STATUS;
919 ccw->flags = 0;
920 ccw->count = sizeof(status);
921 ccw->cda = (__u32)(unsigned long)vcdev->status;
922 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS);
923 /* Write failed? We assume status is unchanged. */
924 if (ret)
925 *vcdev->status = old_status;
926 kfree(ccw);
927 }
928
929 static struct virtio_config_ops virtio_ccw_config_ops = {
930 .get_features = virtio_ccw_get_features,
931 .finalize_features = virtio_ccw_finalize_features,
932 .get = virtio_ccw_get_config,
933 .set = virtio_ccw_set_config,
934 .get_status = virtio_ccw_get_status,
935 .set_status = virtio_ccw_set_status,
936 .reset = virtio_ccw_reset,
937 .find_vqs = virtio_ccw_find_vqs,
938 .del_vqs = virtio_ccw_del_vqs,
939 };
940
941
942 /*
943 * ccw bus driver related functions
944 */
945
946 static void virtio_ccw_release_dev(struct device *_d)
947 {
948 struct virtio_device *dev = container_of(_d, struct virtio_device,
949 dev);
950 struct virtio_ccw_device *vcdev = to_vc_device(dev);
951
952 kfree(vcdev->status);
953 kfree(vcdev->config_block);
954 kfree(vcdev);
955 }
956
957 static int irb_is_error(struct irb *irb)
958 {
959 if (scsw_cstat(&irb->scsw) != 0)
960 return 1;
961 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))
962 return 1;
963 if (scsw_cc(&irb->scsw) != 0)
964 return 1;
965 return 0;
966 }
967
968 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev,
969 int index)
970 {
971 struct virtio_ccw_vq_info *info;
972 unsigned long flags;
973 struct virtqueue *vq;
974
975 vq = NULL;
976 spin_lock_irqsave(&vcdev->lock, flags);
977 list_for_each_entry(info, &vcdev->virtqueues, node) {
978 if (info->vq->index == index) {
979 vq = info->vq;
980 break;
981 }
982 }
983 spin_unlock_irqrestore(&vcdev->lock, flags);
984 return vq;
985 }
986
987 static void virtio_ccw_int_handler(struct ccw_device *cdev,
988 unsigned long intparm,
989 struct irb *irb)
990 {
991 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK;
992 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
993 int i;
994 struct virtqueue *vq;
995
996 if (!vcdev)
997 return;
998 /* Check if it's a notification from the host. */
999 if ((intparm == 0) &&
1000 (scsw_stctl(&irb->scsw) ==
1001 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) {
1002 /* OK */
1003 }
1004 if (irb_is_error(irb)) {
1005 /* Command reject? */
1006 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
1007 (irb->ecw[0] & SNS0_CMD_REJECT))
1008 vcdev->err = -EOPNOTSUPP;
1009 else
1010 /* Map everything else to -EIO. */
1011 vcdev->err = -EIO;
1012 }
1013 if (vcdev->curr_io & activity) {
1014 switch (activity) {
1015 case VIRTIO_CCW_DOING_READ_FEAT:
1016 case VIRTIO_CCW_DOING_WRITE_FEAT:
1017 case VIRTIO_CCW_DOING_READ_CONFIG:
1018 case VIRTIO_CCW_DOING_WRITE_CONFIG:
1019 case VIRTIO_CCW_DOING_WRITE_STATUS:
1020 case VIRTIO_CCW_DOING_SET_VQ:
1021 case VIRTIO_CCW_DOING_SET_IND:
1022 case VIRTIO_CCW_DOING_SET_CONF_IND:
1023 case VIRTIO_CCW_DOING_RESET:
1024 case VIRTIO_CCW_DOING_READ_VQ_CONF:
1025 case VIRTIO_CCW_DOING_SET_IND_ADAPTER:
1026 case VIRTIO_CCW_DOING_SET_VIRTIO_REV:
1027 vcdev->curr_io &= ~activity;
1028 wake_up(&vcdev->wait_q);
1029 break;
1030 default:
1031 /* don't know what to do... */
1032 dev_warn(&cdev->dev, "Suspicious activity '%08x'\n",
1033 activity);
1034 WARN_ON(1);
1035 break;
1036 }
1037 }
1038 for_each_set_bit(i, &vcdev->indicators,
1039 sizeof(vcdev->indicators) * BITS_PER_BYTE) {
1040 /* The bit clear must happen before the vring kick. */
1041 clear_bit(i, &vcdev->indicators);
1042 barrier();
1043 vq = virtio_ccw_vq_by_ind(vcdev, i);
1044 vring_interrupt(0, vq);
1045 }
1046 if (test_bit(0, &vcdev->indicators2)) {
1047 virtio_config_changed(&vcdev->vdev);
1048 clear_bit(0, &vcdev->indicators2);
1049 }
1050 }
1051
1052 /*
1053 * We usually want to autoonline all devices, but give the admin
1054 * a way to exempt devices from this.
1055 */
1056 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
1057 (8*sizeof(long)))
1058 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS];
1059
1060 static char *no_auto = "";
1061
1062 module_param(no_auto, charp, 0444);
1063 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined");
1064
1065 static int virtio_ccw_check_autoonline(struct ccw_device *cdev)
1066 {
1067 struct ccw_dev_id id;
1068
1069 ccw_device_get_id(cdev, &id);
1070 if (test_bit(id.devno, devs_no_auto[id.ssid]))
1071 return 0;
1072 return 1;
1073 }
1074
1075 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie)
1076 {
1077 struct ccw_device *cdev = data;
1078 int ret;
1079
1080 ret = ccw_device_set_online(cdev);
1081 if (ret)
1082 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret);
1083 }
1084
1085 static int virtio_ccw_probe(struct ccw_device *cdev)
1086 {
1087 cdev->handler = virtio_ccw_int_handler;
1088
1089 if (virtio_ccw_check_autoonline(cdev))
1090 async_schedule(virtio_ccw_auto_online, cdev);
1091 return 0;
1092 }
1093
1094 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev)
1095 {
1096 unsigned long flags;
1097 struct virtio_ccw_device *vcdev;
1098
1099 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1100 vcdev = dev_get_drvdata(&cdev->dev);
1101 if (!vcdev || vcdev->going_away) {
1102 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1103 return NULL;
1104 }
1105 vcdev->going_away = true;
1106 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1107 return vcdev;
1108 }
1109
1110 static void virtio_ccw_remove(struct ccw_device *cdev)
1111 {
1112 unsigned long flags;
1113 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1114
1115 if (vcdev && cdev->online) {
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 }
1123 cdev->handler = NULL;
1124 }
1125
1126 static int virtio_ccw_offline(struct ccw_device *cdev)
1127 {
1128 unsigned long flags;
1129 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1130
1131 if (!vcdev)
1132 return 0;
1133 if (vcdev->device_lost)
1134 virtio_break_device(&vcdev->vdev);
1135 unregister_virtio_device(&vcdev->vdev);
1136 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1137 dev_set_drvdata(&cdev->dev, NULL);
1138 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1139 return 0;
1140 }
1141
1142 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev)
1143 {
1144 struct virtio_rev_info *rev;
1145 struct ccw1 *ccw;
1146 int ret;
1147
1148 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
1149 if (!ccw)
1150 return -ENOMEM;
1151 rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL);
1152 if (!rev) {
1153 kfree(ccw);
1154 return -ENOMEM;
1155 }
1156
1157 /* Set transport revision */
1158 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV;
1159 ccw->flags = 0;
1160 ccw->count = sizeof(*rev);
1161 ccw->cda = (__u32)(unsigned long)rev;
1162
1163 vcdev->revision = VIRTIO_CCW_REV_MAX;
1164 do {
1165 rev->revision = vcdev->revision;
1166 /* none of our supported revisions carry payload */
1167 rev->length = 0;
1168 ret = ccw_io_helper(vcdev, ccw,
1169 VIRTIO_CCW_DOING_SET_VIRTIO_REV);
1170 if (ret == -EOPNOTSUPP) {
1171 if (vcdev->revision == 0)
1172 /*
1173 * The host device does not support setting
1174 * the revision: let's operate it in legacy
1175 * mode.
1176 */
1177 ret = 0;
1178 else
1179 vcdev->revision--;
1180 }
1181 } while (ret == -EOPNOTSUPP);
1182
1183 kfree(ccw);
1184 kfree(rev);
1185 return ret;
1186 }
1187
1188 static int virtio_ccw_online(struct ccw_device *cdev)
1189 {
1190 int ret;
1191 struct virtio_ccw_device *vcdev;
1192 unsigned long flags;
1193
1194 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL);
1195 if (!vcdev) {
1196 dev_warn(&cdev->dev, "Could not get memory for virtio\n");
1197 ret = -ENOMEM;
1198 goto out_free;
1199 }
1200 vcdev->config_block = kzalloc(sizeof(*vcdev->config_block),
1201 GFP_DMA | GFP_KERNEL);
1202 if (!vcdev->config_block) {
1203 ret = -ENOMEM;
1204 goto out_free;
1205 }
1206 vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL);
1207 if (!vcdev->status) {
1208 ret = -ENOMEM;
1209 goto out_free;
1210 }
1211
1212 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */
1213
1214 vcdev->vdev.dev.parent = &cdev->dev;
1215 vcdev->vdev.dev.release = virtio_ccw_release_dev;
1216 vcdev->vdev.config = &virtio_ccw_config_ops;
1217 vcdev->cdev = cdev;
1218 init_waitqueue_head(&vcdev->wait_q);
1219 INIT_LIST_HEAD(&vcdev->virtqueues);
1220 spin_lock_init(&vcdev->lock);
1221
1222 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1223 dev_set_drvdata(&cdev->dev, vcdev);
1224 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1225 vcdev->vdev.id.vendor = cdev->id.cu_type;
1226 vcdev->vdev.id.device = cdev->id.cu_model;
1227
1228 ret = virtio_ccw_set_transport_rev(vcdev);
1229 if (ret)
1230 goto out_free;
1231
1232 ret = register_virtio_device(&vcdev->vdev);
1233 if (ret) {
1234 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n",
1235 ret);
1236 goto out_put;
1237 }
1238 return 0;
1239 out_put:
1240 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1241 dev_set_drvdata(&cdev->dev, NULL);
1242 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1243 put_device(&vcdev->vdev.dev);
1244 return ret;
1245 out_free:
1246 if (vcdev) {
1247 kfree(vcdev->status);
1248 kfree(vcdev->config_block);
1249 }
1250 kfree(vcdev);
1251 return ret;
1252 }
1253
1254 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event)
1255 {
1256 int rc;
1257 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1258
1259 /*
1260 * Make sure vcdev is set
1261 * i.e. set_offline/remove callback not already running
1262 */
1263 if (!vcdev)
1264 return NOTIFY_DONE;
1265
1266 switch (event) {
1267 case CIO_GONE:
1268 vcdev->device_lost = true;
1269 rc = NOTIFY_DONE;
1270 break;
1271 default:
1272 rc = NOTIFY_DONE;
1273 break;
1274 }
1275 return rc;
1276 }
1277
1278 static struct ccw_device_id virtio_ids[] = {
1279 { CCW_DEVICE(0x3832, 0) },
1280 {},
1281 };
1282 MODULE_DEVICE_TABLE(ccw, virtio_ids);
1283
1284 static struct ccw_driver virtio_ccw_driver = {
1285 .driver = {
1286 .owner = THIS_MODULE,
1287 .name = "virtio_ccw",
1288 },
1289 .ids = virtio_ids,
1290 .probe = virtio_ccw_probe,
1291 .remove = virtio_ccw_remove,
1292 .set_offline = virtio_ccw_offline,
1293 .set_online = virtio_ccw_online,
1294 .notify = virtio_ccw_cio_notify,
1295 .int_class = IRQIO_VIR,
1296 };
1297
1298 static int __init pure_hex(char **cp, unsigned int *val, int min_digit,
1299 int max_digit, int max_val)
1300 {
1301 int diff;
1302
1303 diff = 0;
1304 *val = 0;
1305
1306 while (diff <= max_digit) {
1307 int value = hex_to_bin(**cp);
1308
1309 if (value < 0)
1310 break;
1311 *val = *val * 16 + value;
1312 (*cp)++;
1313 diff++;
1314 }
1315
1316 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
1317 return 1;
1318
1319 return 0;
1320 }
1321
1322 static int __init parse_busid(char *str, unsigned int *cssid,
1323 unsigned int *ssid, unsigned int *devno)
1324 {
1325 char *str_work;
1326 int rc, ret;
1327
1328 rc = 1;
1329
1330 if (*str == '\0')
1331 goto out;
1332
1333 str_work = str;
1334 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
1335 if (ret || (str_work[0] != '.'))
1336 goto out;
1337 str_work++;
1338 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
1339 if (ret || (str_work[0] != '.'))
1340 goto out;
1341 str_work++;
1342 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
1343 if (ret || (str_work[0] != '\0'))
1344 goto out;
1345
1346 rc = 0;
1347 out:
1348 return rc;
1349 }
1350
1351 static void __init no_auto_parse(void)
1352 {
1353 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
1354 char *parm, *str;
1355 int rc;
1356
1357 str = no_auto;
1358 while ((parm = strsep(&str, ","))) {
1359 rc = parse_busid(strsep(&parm, "-"), &from_cssid,
1360 &from_ssid, &from);
1361 if (rc)
1362 continue;
1363 if (parm != NULL) {
1364 rc = parse_busid(parm, &to_cssid,
1365 &to_ssid, &to);
1366 if ((from_ssid > to_ssid) ||
1367 ((from_ssid == to_ssid) && (from > to)))
1368 rc = -EINVAL;
1369 } else {
1370 to_cssid = from_cssid;
1371 to_ssid = from_ssid;
1372 to = from;
1373 }
1374 if (rc)
1375 continue;
1376 while ((from_ssid < to_ssid) ||
1377 ((from_ssid == to_ssid) && (from <= to))) {
1378 set_bit(from, devs_no_auto[from_ssid]);
1379 from++;
1380 if (from > __MAX_SUBCHANNEL) {
1381 from_ssid++;
1382 from = 0;
1383 }
1384 }
1385 }
1386 }
1387
1388 static int __init virtio_ccw_init(void)
1389 {
1390 /* parse no_auto string before we do anything further */
1391 no_auto_parse();
1392 return ccw_driver_register(&virtio_ccw_driver);
1393 }
1394 module_init(virtio_ccw_init);
1395
1396 static void __exit virtio_ccw_exit(void)
1397 {
1398 int i;
1399
1400 ccw_driver_unregister(&virtio_ccw_driver);
1401 for (i = 0; i < MAX_AIRQ_AREAS; i++)
1402 destroy_airq_info(airq_areas[i]);
1403 }
1404 module_exit(virtio_ccw_exit);
Linux kernel - Deliverables
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