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Merge tag 'nfsd-4.8-1' of git://linux-nfs.org/~bfields/linux
[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 /* payload is the address of the indicators */
346 indicatorp = kmalloc(sizeof(&vcdev->indicators),
347 GFP_DMA | GFP_KERNEL);
348 if (!indicatorp)
349 return;
350 *indicatorp = 0;
351 ccw->cmd_code = CCW_CMD_SET_IND;
352 ccw->count = sizeof(&vcdev->indicators);
353 ccw->cda = (__u32)(unsigned long) indicatorp;
354 }
355 /* Deregister indicators from host. */
356 vcdev->indicators = 0;
357 ccw->flags = 0;
358 ret = ccw_io_helper(vcdev, ccw,
359 vcdev->is_thinint ?
360 VIRTIO_CCW_DOING_SET_IND_ADAPTER :
361 VIRTIO_CCW_DOING_SET_IND);
362 if (ret && (ret != -ENODEV))
363 dev_info(&vcdev->cdev->dev,
364 "Failed to deregister indicators (%d)\n", ret);
365 else if (vcdev->is_thinint)
366 virtio_ccw_drop_indicators(vcdev);
367 kfree(indicatorp);
368 kfree(thinint_area);
369 }
370
371 static inline long __do_kvm_notify(struct subchannel_id schid,
372 unsigned long queue_index,
373 long cookie)
374 {
375 register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY;
376 register struct subchannel_id __schid asm("2") = schid;
377 register unsigned long __index asm("3") = queue_index;
378 register long __rc asm("2");
379 register long __cookie asm("4") = cookie;
380
381 asm volatile ("diag 2,4,0x500\n"
382 : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index),
383 "d"(__cookie)
384 : "memory", "cc");
385 return __rc;
386 }
387
388 static inline long do_kvm_notify(struct subchannel_id schid,
389 unsigned long queue_index,
390 long cookie)
391 {
392 diag_stat_inc(DIAG_STAT_X500);
393 return __do_kvm_notify(schid, queue_index, cookie);
394 }
395
396 static bool virtio_ccw_kvm_notify(struct virtqueue *vq)
397 {
398 struct virtio_ccw_vq_info *info = vq->priv;
399 struct virtio_ccw_device *vcdev;
400 struct subchannel_id schid;
401
402 vcdev = to_vc_device(info->vq->vdev);
403 ccw_device_get_schid(vcdev->cdev, &schid);
404 info->cookie = do_kvm_notify(schid, vq->index, info->cookie);
405 if (info->cookie < 0)
406 return false;
407 return true;
408 }
409
410 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev,
411 struct ccw1 *ccw, int index)
412 {
413 int ret;
414
415 vcdev->config_block->index = index;
416 ccw->cmd_code = CCW_CMD_READ_VQ_CONF;
417 ccw->flags = 0;
418 ccw->count = sizeof(struct vq_config_block);
419 ccw->cda = (__u32)(unsigned long)(vcdev->config_block);
420 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF);
421 if (ret)
422 return ret;
423 return vcdev->config_block->num;
424 }
425
426 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw)
427 {
428 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev);
429 struct virtio_ccw_vq_info *info = vq->priv;
430 unsigned long flags;
431 unsigned long size;
432 int ret;
433 unsigned int index = vq->index;
434
435 /* Remove from our list. */
436 spin_lock_irqsave(&vcdev->lock, flags);
437 list_del(&info->node);
438 spin_unlock_irqrestore(&vcdev->lock, flags);
439
440 /* Release from host. */
441 if (vcdev->revision == 0) {
442 info->info_block->l.queue = 0;
443 info->info_block->l.align = 0;
444 info->info_block->l.index = index;
445 info->info_block->l.num = 0;
446 ccw->count = sizeof(info->info_block->l);
447 } else {
448 info->info_block->s.desc = 0;
449 info->info_block->s.index = index;
450 info->info_block->s.num = 0;
451 info->info_block->s.avail = 0;
452 info->info_block->s.used = 0;
453 ccw->count = sizeof(info->info_block->s);
454 }
455 ccw->cmd_code = CCW_CMD_SET_VQ;
456 ccw->flags = 0;
457 ccw->cda = (__u32)(unsigned long)(info->info_block);
458 ret = ccw_io_helper(vcdev, ccw,
459 VIRTIO_CCW_DOING_SET_VQ | index);
460 /*
461 * -ENODEV isn't considered an error: The device is gone anyway.
462 * This may happen on device detach.
463 */
464 if (ret && (ret != -ENODEV))
465 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d",
466 ret, index);
467
468 vring_del_virtqueue(vq);
469 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
470 free_pages_exact(info->queue, size);
471 kfree(info->info_block);
472 kfree(info);
473 }
474
475 static void virtio_ccw_del_vqs(struct virtio_device *vdev)
476 {
477 struct virtqueue *vq, *n;
478 struct ccw1 *ccw;
479 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
480
481 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
482 if (!ccw)
483 return;
484
485 virtio_ccw_drop_indicator(vcdev, ccw);
486
487 list_for_each_entry_safe(vq, n, &vdev->vqs, list)
488 virtio_ccw_del_vq(vq, ccw);
489
490 kfree(ccw);
491 }
492
493 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
494 int i, vq_callback_t *callback,
495 const char *name,
496 struct ccw1 *ccw)
497 {
498 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
499 int err;
500 struct virtqueue *vq = NULL;
501 struct virtio_ccw_vq_info *info;
502 unsigned long size = 0; /* silence the compiler */
503 unsigned long flags;
504
505 /* Allocate queue. */
506 info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL);
507 if (!info) {
508 dev_warn(&vcdev->cdev->dev, "no info\n");
509 err = -ENOMEM;
510 goto out_err;
511 }
512 info->info_block = kzalloc(sizeof(*info->info_block),
513 GFP_DMA | GFP_KERNEL);
514 if (!info->info_block) {
515 dev_warn(&vcdev->cdev->dev, "no info block\n");
516 err = -ENOMEM;
517 goto out_err;
518 }
519 info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i);
520 if (info->num < 0) {
521 err = info->num;
522 goto out_err;
523 }
524 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
525 info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
526 if (info->queue == NULL) {
527 dev_warn(&vcdev->cdev->dev, "no queue\n");
528 err = -ENOMEM;
529 goto out_err;
530 }
531
532 vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev,
533 true, info->queue, virtio_ccw_kvm_notify,
534 callback, name);
535 if (!vq) {
536 /* For now, we fail if we can't get the requested size. */
537 dev_warn(&vcdev->cdev->dev, "no vq\n");
538 err = -ENOMEM;
539 goto out_err;
540 }
541
542 /* Register it with the host. */
543 if (vcdev->revision == 0) {
544 info->info_block->l.queue = (__u64)info->queue;
545 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN;
546 info->info_block->l.index = i;
547 info->info_block->l.num = info->num;
548 ccw->count = sizeof(info->info_block->l);
549 } else {
550 info->info_block->s.desc = (__u64)info->queue;
551 info->info_block->s.index = i;
552 info->info_block->s.num = info->num;
553 info->info_block->s.avail = (__u64)virtqueue_get_avail(vq);
554 info->info_block->s.used = (__u64)virtqueue_get_used(vq);
555 ccw->count = sizeof(info->info_block->s);
556 }
557 ccw->cmd_code = CCW_CMD_SET_VQ;
558 ccw->flags = 0;
559 ccw->cda = (__u32)(unsigned long)(info->info_block);
560 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i);
561 if (err) {
562 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n");
563 goto out_err;
564 }
565
566 info->vq = vq;
567 vq->priv = info;
568
569 /* Save it to our list. */
570 spin_lock_irqsave(&vcdev->lock, flags);
571 list_add(&info->node, &vcdev->virtqueues);
572 spin_unlock_irqrestore(&vcdev->lock, flags);
573
574 return vq;
575
576 out_err:
577 if (vq)
578 vring_del_virtqueue(vq);
579 if (info) {
580 if (info->queue)
581 free_pages_exact(info->queue, size);
582 kfree(info->info_block);
583 }
584 kfree(info);
585 return ERR_PTR(err);
586 }
587
588 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev,
589 struct virtqueue *vqs[], int nvqs,
590 struct ccw1 *ccw)
591 {
592 int ret;
593 struct virtio_thinint_area *thinint_area = NULL;
594 struct airq_info *info;
595
596 thinint_area = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL);
597 if (!thinint_area) {
598 ret = -ENOMEM;
599 goto out;
600 }
601 /* Try to get an indicator. */
602 thinint_area->indicator = get_airq_indicator(vqs, nvqs,
603 &thinint_area->bit_nr,
604 &vcdev->airq_info);
605 if (!thinint_area->indicator) {
606 ret = -ENOSPC;
607 goto out;
608 }
609 info = vcdev->airq_info;
610 thinint_area->summary_indicator =
611 (unsigned long) &info->summary_indicator;
612 thinint_area->isc = VIRTIO_AIRQ_ISC;
613 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
614 ccw->flags = CCW_FLAG_SLI;
615 ccw->count = sizeof(*thinint_area);
616 ccw->cda = (__u32)(unsigned long)thinint_area;
617 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER);
618 if (ret) {
619 if (ret == -EOPNOTSUPP) {
620 /*
621 * The host does not support adapter interrupts
622 * for virtio-ccw, stop trying.
623 */
624 virtio_ccw_use_airq = 0;
625 pr_info("Adapter interrupts unsupported on host\n");
626 } else
627 dev_warn(&vcdev->cdev->dev,
628 "enabling adapter interrupts = %d\n", ret);
629 virtio_ccw_drop_indicators(vcdev);
630 }
631 out:
632 kfree(thinint_area);
633 return ret;
634 }
635
636 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
637 struct virtqueue *vqs[],
638 vq_callback_t *callbacks[],
639 const char * const names[])
640 {
641 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
642 unsigned long *indicatorp = NULL;
643 int ret, i;
644 struct ccw1 *ccw;
645
646 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
647 if (!ccw)
648 return -ENOMEM;
649
650 for (i = 0; i < nvqs; ++i) {
651 vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i],
652 ccw);
653 if (IS_ERR(vqs[i])) {
654 ret = PTR_ERR(vqs[i]);
655 vqs[i] = NULL;
656 goto out;
657 }
658 }
659 ret = -ENOMEM;
660 /*
661 * We need a data area under 2G to communicate. Our payload is
662 * the address of the indicators.
663 */
664 indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL);
665 if (!indicatorp)
666 goto out;
667 *indicatorp = (unsigned long) &vcdev->indicators;
668 if (vcdev->is_thinint) {
669 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw);
670 if (ret)
671 /* no error, just fall back to legacy interrupts */
672 vcdev->is_thinint = 0;
673 }
674 if (!vcdev->is_thinint) {
675 /* Register queue indicators with host. */
676 vcdev->indicators = 0;
677 ccw->cmd_code = CCW_CMD_SET_IND;
678 ccw->flags = 0;
679 ccw->count = sizeof(&vcdev->indicators);
680 ccw->cda = (__u32)(unsigned long) indicatorp;
681 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND);
682 if (ret)
683 goto out;
684 }
685 /* Register indicators2 with host for config changes */
686 *indicatorp = (unsigned long) &vcdev->indicators2;
687 vcdev->indicators2 = 0;
688 ccw->cmd_code = CCW_CMD_SET_CONF_IND;
689 ccw->flags = 0;
690 ccw->count = sizeof(&vcdev->indicators2);
691 ccw->cda = (__u32)(unsigned long) indicatorp;
692 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND);
693 if (ret)
694 goto out;
695
696 kfree(indicatorp);
697 kfree(ccw);
698 return 0;
699 out:
700 kfree(indicatorp);
701 kfree(ccw);
702 virtio_ccw_del_vqs(vdev);
703 return ret;
704 }
705
706 static void virtio_ccw_reset(struct virtio_device *vdev)
707 {
708 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
709 struct ccw1 *ccw;
710
711 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
712 if (!ccw)
713 return;
714
715 /* Zero status bits. */
716 *vcdev->status = 0;
717
718 /* Send a reset ccw on device. */
719 ccw->cmd_code = CCW_CMD_VDEV_RESET;
720 ccw->flags = 0;
721 ccw->count = 0;
722 ccw->cda = 0;
723 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET);
724 kfree(ccw);
725 }
726
727 static u64 virtio_ccw_get_features(struct virtio_device *vdev)
728 {
729 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
730 struct virtio_feature_desc *features;
731 int ret;
732 u64 rc;
733 struct ccw1 *ccw;
734
735 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
736 if (!ccw)
737 return 0;
738
739 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
740 if (!features) {
741 rc = 0;
742 goto out_free;
743 }
744 /* Read the feature bits from the host. */
745 features->index = 0;
746 ccw->cmd_code = CCW_CMD_READ_FEAT;
747 ccw->flags = 0;
748 ccw->count = sizeof(*features);
749 ccw->cda = (__u32)(unsigned long)features;
750 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
751 if (ret) {
752 rc = 0;
753 goto out_free;
754 }
755
756 rc = le32_to_cpu(features->features);
757
758 if (vcdev->revision == 0)
759 goto out_free;
760
761 /* Read second half of the feature bits from the host. */
762 features->index = 1;
763 ccw->cmd_code = CCW_CMD_READ_FEAT;
764 ccw->flags = 0;
765 ccw->count = sizeof(*features);
766 ccw->cda = (__u32)(unsigned long)features;
767 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
768 if (ret == 0)
769 rc |= (u64)le32_to_cpu(features->features) << 32;
770
771 out_free:
772 kfree(features);
773 kfree(ccw);
774 return rc;
775 }
776
777 static int virtio_ccw_finalize_features(struct virtio_device *vdev)
778 {
779 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
780 struct virtio_feature_desc *features;
781 struct ccw1 *ccw;
782 int ret;
783
784 if (vcdev->revision >= 1 &&
785 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
786 dev_err(&vdev->dev, "virtio: device uses revision 1 "
787 "but does not have VIRTIO_F_VERSION_1\n");
788 return -EINVAL;
789 }
790
791 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
792 if (!ccw)
793 return -ENOMEM;
794
795 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
796 if (!features) {
797 ret = -ENOMEM;
798 goto out_free;
799 }
800 /* Give virtio_ring a chance to accept features. */
801 vring_transport_features(vdev);
802
803 features->index = 0;
804 features->features = cpu_to_le32((u32)vdev->features);
805 /* Write the first half of the feature bits to the host. */
806 ccw->cmd_code = CCW_CMD_WRITE_FEAT;
807 ccw->flags = 0;
808 ccw->count = sizeof(*features);
809 ccw->cda = (__u32)(unsigned long)features;
810 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
811 if (ret)
812 goto out_free;
813
814 if (vcdev->revision == 0)
815 goto out_free;
816
817 features->index = 1;
818 features->features = cpu_to_le32(vdev->features >> 32);
819 /* Write the second half of the feature bits to the host. */
820 ccw->cmd_code = CCW_CMD_WRITE_FEAT;
821 ccw->flags = 0;
822 ccw->count = sizeof(*features);
823 ccw->cda = (__u32)(unsigned long)features;
824 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
825
826 out_free:
827 kfree(features);
828 kfree(ccw);
829
830 return ret;
831 }
832
833 static void virtio_ccw_get_config(struct virtio_device *vdev,
834 unsigned int offset, void *buf, unsigned len)
835 {
836 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
837 int ret;
838 struct ccw1 *ccw;
839 void *config_area;
840
841 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
842 if (!ccw)
843 return;
844
845 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
846 if (!config_area)
847 goto out_free;
848
849 /* Read the config area from the host. */
850 ccw->cmd_code = CCW_CMD_READ_CONF;
851 ccw->flags = 0;
852 ccw->count = offset + len;
853 ccw->cda = (__u32)(unsigned long)config_area;
854 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG);
855 if (ret)
856 goto out_free;
857
858 memcpy(vcdev->config, config_area, offset + len);
859 if (buf)
860 memcpy(buf, &vcdev->config[offset], len);
861 if (vcdev->config_ready < offset + len)
862 vcdev->config_ready = offset + len;
863
864 out_free:
865 kfree(config_area);
866 kfree(ccw);
867 }
868
869 static void virtio_ccw_set_config(struct virtio_device *vdev,
870 unsigned int offset, const void *buf,
871 unsigned len)
872 {
873 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
874 struct ccw1 *ccw;
875 void *config_area;
876
877 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
878 if (!ccw)
879 return;
880
881 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
882 if (!config_area)
883 goto out_free;
884
885 /* Make sure we don't overwrite fields. */
886 if (vcdev->config_ready < offset)
887 virtio_ccw_get_config(vdev, 0, NULL, offset);
888 memcpy(&vcdev->config[offset], buf, len);
889 /* Write the config area to the host. */
890 memcpy(config_area, vcdev->config, sizeof(vcdev->config));
891 ccw->cmd_code = CCW_CMD_WRITE_CONF;
892 ccw->flags = 0;
893 ccw->count = offset + len;
894 ccw->cda = (__u32)(unsigned long)config_area;
895 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG);
896
897 out_free:
898 kfree(config_area);
899 kfree(ccw);
900 }
901
902 static u8 virtio_ccw_get_status(struct virtio_device *vdev)
903 {
904 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
905
906 return *vcdev->status;
907 }
908
909 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status)
910 {
911 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
912 u8 old_status = *vcdev->status;
913 struct ccw1 *ccw;
914 int ret;
915
916 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
917 if (!ccw)
918 return;
919
920 /* Write the status to the host. */
921 *vcdev->status = status;
922 ccw->cmd_code = CCW_CMD_WRITE_STATUS;
923 ccw->flags = 0;
924 ccw->count = sizeof(status);
925 ccw->cda = (__u32)(unsigned long)vcdev->status;
926 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS);
927 /* Write failed? We assume status is unchanged. */
928 if (ret)
929 *vcdev->status = old_status;
930 kfree(ccw);
931 }
932
933 static struct virtio_config_ops virtio_ccw_config_ops = {
934 .get_features = virtio_ccw_get_features,
935 .finalize_features = virtio_ccw_finalize_features,
936 .get = virtio_ccw_get_config,
937 .set = virtio_ccw_set_config,
938 .get_status = virtio_ccw_get_status,
939 .set_status = virtio_ccw_set_status,
940 .reset = virtio_ccw_reset,
941 .find_vqs = virtio_ccw_find_vqs,
942 .del_vqs = virtio_ccw_del_vqs,
943 };
944
945
946 /*
947 * ccw bus driver related functions
948 */
949
950 static void virtio_ccw_release_dev(struct device *_d)
951 {
952 struct virtio_device *dev = dev_to_virtio(_d);
953 struct virtio_ccw_device *vcdev = to_vc_device(dev);
954
955 kfree(vcdev->status);
956 kfree(vcdev->config_block);
957 kfree(vcdev);
958 }
959
960 static int irb_is_error(struct irb *irb)
961 {
962 if (scsw_cstat(&irb->scsw) != 0)
963 return 1;
964 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))
965 return 1;
966 if (scsw_cc(&irb->scsw) != 0)
967 return 1;
968 return 0;
969 }
970
971 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev,
972 int index)
973 {
974 struct virtio_ccw_vq_info *info;
975 unsigned long flags;
976 struct virtqueue *vq;
977
978 vq = NULL;
979 spin_lock_irqsave(&vcdev->lock, flags);
980 list_for_each_entry(info, &vcdev->virtqueues, node) {
981 if (info->vq->index == index) {
982 vq = info->vq;
983 break;
984 }
985 }
986 spin_unlock_irqrestore(&vcdev->lock, flags);
987 return vq;
988 }
989
990 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev,
991 __u32 activity)
992 {
993 if (vcdev->curr_io & activity) {
994 switch (activity) {
995 case VIRTIO_CCW_DOING_READ_FEAT:
996 case VIRTIO_CCW_DOING_WRITE_FEAT:
997 case VIRTIO_CCW_DOING_READ_CONFIG:
998 case VIRTIO_CCW_DOING_WRITE_CONFIG:
999 case VIRTIO_CCW_DOING_WRITE_STATUS:
1000 case VIRTIO_CCW_DOING_SET_VQ:
1001 case VIRTIO_CCW_DOING_SET_IND:
1002 case VIRTIO_CCW_DOING_SET_CONF_IND:
1003 case VIRTIO_CCW_DOING_RESET:
1004 case VIRTIO_CCW_DOING_READ_VQ_CONF:
1005 case VIRTIO_CCW_DOING_SET_IND_ADAPTER:
1006 case VIRTIO_CCW_DOING_SET_VIRTIO_REV:
1007 vcdev->curr_io &= ~activity;
1008 wake_up(&vcdev->wait_q);
1009 break;
1010 default:
1011 /* don't know what to do... */
1012 dev_warn(&vcdev->cdev->dev,
1013 "Suspicious activity '%08x'\n", activity);
1014 WARN_ON(1);
1015 break;
1016 }
1017 }
1018 }
1019
1020 static void virtio_ccw_int_handler(struct ccw_device *cdev,
1021 unsigned long intparm,
1022 struct irb *irb)
1023 {
1024 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK;
1025 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1026 int i;
1027 struct virtqueue *vq;
1028
1029 if (!vcdev)
1030 return;
1031 if (IS_ERR(irb)) {
1032 vcdev->err = PTR_ERR(irb);
1033 virtio_ccw_check_activity(vcdev, activity);
1034 /* Don't poke around indicators, something's wrong. */
1035 return;
1036 }
1037 /* Check if it's a notification from the host. */
1038 if ((intparm == 0) &&
1039 (scsw_stctl(&irb->scsw) ==
1040 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) {
1041 /* OK */
1042 }
1043 if (irb_is_error(irb)) {
1044 /* Command reject? */
1045 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
1046 (irb->ecw[0] & SNS0_CMD_REJECT))
1047 vcdev->err = -EOPNOTSUPP;
1048 else
1049 /* Map everything else to -EIO. */
1050 vcdev->err = -EIO;
1051 }
1052 virtio_ccw_check_activity(vcdev, activity);
1053 for_each_set_bit(i, &vcdev->indicators,
1054 sizeof(vcdev->indicators) * BITS_PER_BYTE) {
1055 /* The bit clear must happen before the vring kick. */
1056 clear_bit(i, &vcdev->indicators);
1057 barrier();
1058 vq = virtio_ccw_vq_by_ind(vcdev, i);
1059 vring_interrupt(0, vq);
1060 }
1061 if (test_bit(0, &vcdev->indicators2)) {
1062 virtio_config_changed(&vcdev->vdev);
1063 clear_bit(0, &vcdev->indicators2);
1064 }
1065 }
1066
1067 /*
1068 * We usually want to autoonline all devices, but give the admin
1069 * a way to exempt devices from this.
1070 */
1071 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
1072 (8*sizeof(long)))
1073 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS];
1074
1075 static char *no_auto = "";
1076
1077 module_param(no_auto, charp, 0444);
1078 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined");
1079
1080 static int virtio_ccw_check_autoonline(struct ccw_device *cdev)
1081 {
1082 struct ccw_dev_id id;
1083
1084 ccw_device_get_id(cdev, &id);
1085 if (test_bit(id.devno, devs_no_auto[id.ssid]))
1086 return 0;
1087 return 1;
1088 }
1089
1090 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie)
1091 {
1092 struct ccw_device *cdev = data;
1093 int ret;
1094
1095 ret = ccw_device_set_online(cdev);
1096 if (ret)
1097 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret);
1098 }
1099
1100 static int virtio_ccw_probe(struct ccw_device *cdev)
1101 {
1102 cdev->handler = virtio_ccw_int_handler;
1103
1104 if (virtio_ccw_check_autoonline(cdev))
1105 async_schedule(virtio_ccw_auto_online, cdev);
1106 return 0;
1107 }
1108
1109 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev)
1110 {
1111 unsigned long flags;
1112 struct virtio_ccw_device *vcdev;
1113
1114 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1115 vcdev = dev_get_drvdata(&cdev->dev);
1116 if (!vcdev || vcdev->going_away) {
1117 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1118 return NULL;
1119 }
1120 vcdev->going_away = true;
1121 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1122 return vcdev;
1123 }
1124
1125 static void virtio_ccw_remove(struct ccw_device *cdev)
1126 {
1127 unsigned long flags;
1128 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1129
1130 if (vcdev && cdev->online) {
1131 if (vcdev->device_lost)
1132 virtio_break_device(&vcdev->vdev);
1133 unregister_virtio_device(&vcdev->vdev);
1134 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1135 dev_set_drvdata(&cdev->dev, NULL);
1136 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1137 }
1138 cdev->handler = NULL;
1139 }
1140
1141 static int virtio_ccw_offline(struct ccw_device *cdev)
1142 {
1143 unsigned long flags;
1144 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1145
1146 if (!vcdev)
1147 return 0;
1148 if (vcdev->device_lost)
1149 virtio_break_device(&vcdev->vdev);
1150 unregister_virtio_device(&vcdev->vdev);
1151 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1152 dev_set_drvdata(&cdev->dev, NULL);
1153 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1154 return 0;
1155 }
1156
1157 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev)
1158 {
1159 struct virtio_rev_info *rev;
1160 struct ccw1 *ccw;
1161 int ret;
1162
1163 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
1164 if (!ccw)
1165 return -ENOMEM;
1166 rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL);
1167 if (!rev) {
1168 kfree(ccw);
1169 return -ENOMEM;
1170 }
1171
1172 /* Set transport revision */
1173 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV;
1174 ccw->flags = 0;
1175 ccw->count = sizeof(*rev);
1176 ccw->cda = (__u32)(unsigned long)rev;
1177
1178 vcdev->revision = VIRTIO_CCW_REV_MAX;
1179 do {
1180 rev->revision = vcdev->revision;
1181 /* none of our supported revisions carry payload */
1182 rev->length = 0;
1183 ret = ccw_io_helper(vcdev, ccw,
1184 VIRTIO_CCW_DOING_SET_VIRTIO_REV);
1185 if (ret == -EOPNOTSUPP) {
1186 if (vcdev->revision == 0)
1187 /*
1188 * The host device does not support setting
1189 * the revision: let's operate it in legacy
1190 * mode.
1191 */
1192 ret = 0;
1193 else
1194 vcdev->revision--;
1195 }
1196 } while (ret == -EOPNOTSUPP);
1197
1198 kfree(ccw);
1199 kfree(rev);
1200 return ret;
1201 }
1202
1203 static int virtio_ccw_online(struct ccw_device *cdev)
1204 {
1205 int ret;
1206 struct virtio_ccw_device *vcdev;
1207 unsigned long flags;
1208
1209 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL);
1210 if (!vcdev) {
1211 dev_warn(&cdev->dev, "Could not get memory for virtio\n");
1212 ret = -ENOMEM;
1213 goto out_free;
1214 }
1215 vcdev->config_block = kzalloc(sizeof(*vcdev->config_block),
1216 GFP_DMA | GFP_KERNEL);
1217 if (!vcdev->config_block) {
1218 ret = -ENOMEM;
1219 goto out_free;
1220 }
1221 vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL);
1222 if (!vcdev->status) {
1223 ret = -ENOMEM;
1224 goto out_free;
1225 }
1226
1227 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */
1228
1229 vcdev->vdev.dev.parent = &cdev->dev;
1230 vcdev->vdev.dev.release = virtio_ccw_release_dev;
1231 vcdev->vdev.config = &virtio_ccw_config_ops;
1232 vcdev->cdev = cdev;
1233 init_waitqueue_head(&vcdev->wait_q);
1234 INIT_LIST_HEAD(&vcdev->virtqueues);
1235 spin_lock_init(&vcdev->lock);
1236
1237 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1238 dev_set_drvdata(&cdev->dev, vcdev);
1239 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1240 vcdev->vdev.id.vendor = cdev->id.cu_type;
1241 vcdev->vdev.id.device = cdev->id.cu_model;
1242
1243 ret = virtio_ccw_set_transport_rev(vcdev);
1244 if (ret)
1245 goto out_free;
1246
1247 ret = register_virtio_device(&vcdev->vdev);
1248 if (ret) {
1249 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n",
1250 ret);
1251 goto out_put;
1252 }
1253 return 0;
1254 out_put:
1255 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1256 dev_set_drvdata(&cdev->dev, NULL);
1257 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1258 put_device(&vcdev->vdev.dev);
1259 return ret;
1260 out_free:
1261 if (vcdev) {
1262 kfree(vcdev->status);
1263 kfree(vcdev->config_block);
1264 }
1265 kfree(vcdev);
1266 return ret;
1267 }
1268
1269 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event)
1270 {
1271 int rc;
1272 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1273
1274 /*
1275 * Make sure vcdev is set
1276 * i.e. set_offline/remove callback not already running
1277 */
1278 if (!vcdev)
1279 return NOTIFY_DONE;
1280
1281 switch (event) {
1282 case CIO_GONE:
1283 vcdev->device_lost = true;
1284 rc = NOTIFY_DONE;
1285 break;
1286 default:
1287 rc = NOTIFY_DONE;
1288 break;
1289 }
1290 return rc;
1291 }
1292
1293 static struct ccw_device_id virtio_ids[] = {
1294 { CCW_DEVICE(0x3832, 0) },
1295 {},
1296 };
1297 MODULE_DEVICE_TABLE(ccw, virtio_ids);
1298
1299 static struct ccw_driver virtio_ccw_driver = {
1300 .driver = {
1301 .owner = THIS_MODULE,
1302 .name = "virtio_ccw",
1303 },
1304 .ids = virtio_ids,
1305 .probe = virtio_ccw_probe,
1306 .remove = virtio_ccw_remove,
1307 .set_offline = virtio_ccw_offline,
1308 .set_online = virtio_ccw_online,
1309 .notify = virtio_ccw_cio_notify,
1310 .int_class = IRQIO_VIR,
1311 };
1312
1313 static int __init pure_hex(char **cp, unsigned int *val, int min_digit,
1314 int max_digit, int max_val)
1315 {
1316 int diff;
1317
1318 diff = 0;
1319 *val = 0;
1320
1321 while (diff <= max_digit) {
1322 int value = hex_to_bin(**cp);
1323
1324 if (value < 0)
1325 break;
1326 *val = *val * 16 + value;
1327 (*cp)++;
1328 diff++;
1329 }
1330
1331 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
1332 return 1;
1333
1334 return 0;
1335 }
1336
1337 static int __init parse_busid(char *str, unsigned int *cssid,
1338 unsigned int *ssid, unsigned int *devno)
1339 {
1340 char *str_work;
1341 int rc, ret;
1342
1343 rc = 1;
1344
1345 if (*str == '\0')
1346 goto out;
1347
1348 str_work = str;
1349 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
1350 if (ret || (str_work[0] != '.'))
1351 goto out;
1352 str_work++;
1353 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
1354 if (ret || (str_work[0] != '.'))
1355 goto out;
1356 str_work++;
1357 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
1358 if (ret || (str_work[0] != '\0'))
1359 goto out;
1360
1361 rc = 0;
1362 out:
1363 return rc;
1364 }
1365
1366 static void __init no_auto_parse(void)
1367 {
1368 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
1369 char *parm, *str;
1370 int rc;
1371
1372 str = no_auto;
1373 while ((parm = strsep(&str, ","))) {
1374 rc = parse_busid(strsep(&parm, "-"), &from_cssid,
1375 &from_ssid, &from);
1376 if (rc)
1377 continue;
1378 if (parm != NULL) {
1379 rc = parse_busid(parm, &to_cssid,
1380 &to_ssid, &to);
1381 if ((from_ssid > to_ssid) ||
1382 ((from_ssid == to_ssid) && (from > to)))
1383 rc = -EINVAL;
1384 } else {
1385 to_cssid = from_cssid;
1386 to_ssid = from_ssid;
1387 to = from;
1388 }
1389 if (rc)
1390 continue;
1391 while ((from_ssid < to_ssid) ||
1392 ((from_ssid == to_ssid) && (from <= to))) {
1393 set_bit(from, devs_no_auto[from_ssid]);
1394 from++;
1395 if (from > __MAX_SUBCHANNEL) {
1396 from_ssid++;
1397 from = 0;
1398 }
1399 }
1400 }
1401 }
1402
1403 static int __init virtio_ccw_init(void)
1404 {
1405 /* parse no_auto string before we do anything further */
1406 no_auto_parse();
1407 return ccw_driver_register(&virtio_ccw_driver);
1408 }
1409 module_init(virtio_ccw_init);
1410
1411 static void __exit virtio_ccw_exit(void)
1412 {
1413 int i;
1414
1415 ccw_driver_unregister(&virtio_ccw_driver);
1416 for (i = 0; i < MAX_AIRQ_AREAS; i++)
1417 destroy_airq_info(airq_areas[i]);
1418 }
1419 module_exit(virtio_ccw_exit);
Linux kernel - Deliverables
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