?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
sh_eth: fix EESIPR values for SH77{34|63}
[linux/fpc-iii.git] / drivers / s390 / virtio / virtio_ccw.c
blob639ed4e6afd19b46d1e8fb3ec5669b217da8d3c4
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/moduleparam.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 unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs,
239 u64 *first, void **airq_info)
240 {
241 int i, j;
242 struct airq_info *info;
243 unsigned long indicator_addr = 0;
244 unsigned long bit, flags;
245
246 for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) {
247 if (!airq_areas[i])
248 airq_areas[i] = new_airq_info();
249 info = airq_areas[i];
250 if (!info)
251 return 0;
252 write_lock_irqsave(&info->lock, flags);
253 bit = airq_iv_alloc(info->aiv, nvqs);
254 if (bit == -1UL) {
255 /* Not enough vacancies. */
256 write_unlock_irqrestore(&info->lock, flags);
257 continue;
258 }
259 *first = bit;
260 *airq_info = info;
261 indicator_addr = (unsigned long)info->aiv->vector;
262 for (j = 0; j < nvqs; j++) {
263 airq_iv_set_ptr(info->aiv, bit + j,
264 (unsigned long)vqs[j]);
265 }
266 write_unlock_irqrestore(&info->lock, flags);
267 }
268 return indicator_addr;
269 }
270
271 static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev)
272 {
273 struct virtio_ccw_vq_info *info;
274
275 list_for_each_entry(info, &vcdev->virtqueues, node)
276 drop_airq_indicator(info->vq, vcdev->airq_info);
277 }
278
279 static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag)
280 {
281 unsigned long flags;
282 __u32 ret;
283
284 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
285 if (vcdev->err)
286 ret = 0;
287 else
288 ret = vcdev->curr_io & flag;
289 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
290 return ret;
291 }
292
293 static int ccw_io_helper(struct virtio_ccw_device *vcdev,
294 struct ccw1 *ccw, __u32 intparm)
295 {
296 int ret;
297 unsigned long flags;
298 int flag = intparm & VIRTIO_CCW_INTPARM_MASK;
299
300 do {
301 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
302 ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0);
303 if (!ret) {
304 if (!vcdev->curr_io)
305 vcdev->err = 0;
306 vcdev->curr_io |= flag;
307 }
308 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
309 cpu_relax();
310 } while (ret == -EBUSY);
311 wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0);
312 return ret ? ret : vcdev->err;
313 }
314
315 static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev,
316 struct ccw1 *ccw)
317 {
318 int ret;
319 unsigned long *indicatorp = NULL;
320 struct virtio_thinint_area *thinint_area = NULL;
321 struct airq_info *airq_info = vcdev->airq_info;
322
323 if (vcdev->is_thinint) {
324 thinint_area = kzalloc(sizeof(*thinint_area),
325 GFP_DMA | GFP_KERNEL);
326 if (!thinint_area)
327 return;
328 thinint_area->summary_indicator =
329 (unsigned long) &airq_info->summary_indicator;
330 thinint_area->isc = VIRTIO_AIRQ_ISC;
331 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
332 ccw->count = sizeof(*thinint_area);
333 ccw->cda = (__u32)(unsigned long) thinint_area;
334 } else {
335 /* payload is the address of the indicators */
336 indicatorp = kmalloc(sizeof(&vcdev->indicators),
337 GFP_DMA | GFP_KERNEL);
338 if (!indicatorp)
339 return;
340 *indicatorp = 0;
341 ccw->cmd_code = CCW_CMD_SET_IND;
342 ccw->count = sizeof(&vcdev->indicators);
343 ccw->cda = (__u32)(unsigned long) indicatorp;
344 }
345 /* Deregister indicators from host. */
346 vcdev->indicators = 0;
347 ccw->flags = 0;
348 ret = ccw_io_helper(vcdev, ccw,
349 vcdev->is_thinint ?
350 VIRTIO_CCW_DOING_SET_IND_ADAPTER :
351 VIRTIO_CCW_DOING_SET_IND);
352 if (ret && (ret != -ENODEV))
353 dev_info(&vcdev->cdev->dev,
354 "Failed to deregister indicators (%d)\n", ret);
355 else if (vcdev->is_thinint)
356 virtio_ccw_drop_indicators(vcdev);
357 kfree(indicatorp);
358 kfree(thinint_area);
359 }
360
361 static inline long __do_kvm_notify(struct subchannel_id schid,
362 unsigned long queue_index,
363 long cookie)
364 {
365 register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY;
366 register struct subchannel_id __schid asm("2") = schid;
367 register unsigned long __index asm("3") = queue_index;
368 register long __rc asm("2");
369 register long __cookie asm("4") = cookie;
370
371 asm volatile ("diag 2,4,0x500\n"
372 : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index),
373 "d"(__cookie)
374 : "memory", "cc");
375 return __rc;
376 }
377
378 static inline long do_kvm_notify(struct subchannel_id schid,
379 unsigned long queue_index,
380 long cookie)
381 {
382 diag_stat_inc(DIAG_STAT_X500);
383 return __do_kvm_notify(schid, queue_index, cookie);
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 int ret;
404
405 vcdev->config_block->index = index;
406 ccw->cmd_code = CCW_CMD_READ_VQ_CONF;
407 ccw->flags = 0;
408 ccw->count = sizeof(struct vq_config_block);
409 ccw->cda = (__u32)(unsigned long)(vcdev->config_block);
410 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF);
411 if (ret)
412 return ret;
413 return vcdev->config_block->num;
414 }
415
416 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw)
417 {
418 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev);
419 struct virtio_ccw_vq_info *info = vq->priv;
420 unsigned long flags;
421 unsigned long size;
422 int ret;
423 unsigned int index = vq->index;
424
425 /* Remove from our list. */
426 spin_lock_irqsave(&vcdev->lock, flags);
427 list_del(&info->node);
428 spin_unlock_irqrestore(&vcdev->lock, flags);
429
430 /* Release from host. */
431 if (vcdev->revision == 0) {
432 info->info_block->l.queue = 0;
433 info->info_block->l.align = 0;
434 info->info_block->l.index = index;
435 info->info_block->l.num = 0;
436 ccw->count = sizeof(info->info_block->l);
437 } else {
438 info->info_block->s.desc = 0;
439 info->info_block->s.index = index;
440 info->info_block->s.num = 0;
441 info->info_block->s.avail = 0;
442 info->info_block->s.used = 0;
443 ccw->count = sizeof(info->info_block->s);
444 }
445 ccw->cmd_code = CCW_CMD_SET_VQ;
446 ccw->flags = 0;
447 ccw->cda = (__u32)(unsigned long)(info->info_block);
448 ret = ccw_io_helper(vcdev, ccw,
449 VIRTIO_CCW_DOING_SET_VQ | index);
450 /*
451 * -ENODEV isn't considered an error: The device is gone anyway.
452 * This may happen on device detach.
453 */
454 if (ret && (ret != -ENODEV))
455 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d",
456 ret, index);
457
458 vring_del_virtqueue(vq);
459 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
460 free_pages_exact(info->queue, size);
461 kfree(info->info_block);
462 kfree(info);
463 }
464
465 static void virtio_ccw_del_vqs(struct virtio_device *vdev)
466 {
467 struct virtqueue *vq, *n;
468 struct ccw1 *ccw;
469 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
470
471 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
472 if (!ccw)
473 return;
474
475 virtio_ccw_drop_indicator(vcdev, ccw);
476
477 list_for_each_entry_safe(vq, n, &vdev->vqs, list)
478 virtio_ccw_del_vq(vq, ccw);
479
480 kfree(ccw);
481 }
482
483 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
484 int i, vq_callback_t *callback,
485 const char *name,
486 struct ccw1 *ccw)
487 {
488 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
489 int err;
490 struct virtqueue *vq = NULL;
491 struct virtio_ccw_vq_info *info;
492 unsigned long size = 0; /* silence the compiler */
493 unsigned long flags;
494
495 /* Allocate queue. */
496 info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL);
497 if (!info) {
498 dev_warn(&vcdev->cdev->dev, "no info\n");
499 err = -ENOMEM;
500 goto out_err;
501 }
502 info->info_block = kzalloc(sizeof(*info->info_block),
503 GFP_DMA | GFP_KERNEL);
504 if (!info->info_block) {
505 dev_warn(&vcdev->cdev->dev, "no info block\n");
506 err = -ENOMEM;
507 goto out_err;
508 }
509 info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i);
510 if (info->num < 0) {
511 err = info->num;
512 goto out_err;
513 }
514 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
515 info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
516 if (info->queue == NULL) {
517 dev_warn(&vcdev->cdev->dev, "no queue\n");
518 err = -ENOMEM;
519 goto out_err;
520 }
521
522 vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev,
523 true, info->queue, virtio_ccw_kvm_notify,
524 callback, name);
525 if (!vq) {
526 /* For now, we fail if we can't get the requested size. */
527 dev_warn(&vcdev->cdev->dev, "no vq\n");
528 err = -ENOMEM;
529 goto out_err;
530 }
531
532 /* Register it with the host. */
533 if (vcdev->revision == 0) {
534 info->info_block->l.queue = (__u64)info->queue;
535 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN;
536 info->info_block->l.index = i;
537 info->info_block->l.num = info->num;
538 ccw->count = sizeof(info->info_block->l);
539 } else {
540 info->info_block->s.desc = (__u64)info->queue;
541 info->info_block->s.index = i;
542 info->info_block->s.num = info->num;
543 info->info_block->s.avail = (__u64)virtqueue_get_avail(vq);
544 info->info_block->s.used = (__u64)virtqueue_get_used(vq);
545 ccw->count = sizeof(info->info_block->s);
546 }
547 ccw->cmd_code = CCW_CMD_SET_VQ;
548 ccw->flags = 0;
549 ccw->cda = (__u32)(unsigned long)(info->info_block);
550 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i);
551 if (err) {
552 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n");
553 goto out_err;
554 }
555
556 info->vq = vq;
557 vq->priv = info;
558
559 /* Save it to our list. */
560 spin_lock_irqsave(&vcdev->lock, flags);
561 list_add(&info->node, &vcdev->virtqueues);
562 spin_unlock_irqrestore(&vcdev->lock, flags);
563
564 return vq;
565
566 out_err:
567 if (vq)
568 vring_del_virtqueue(vq);
569 if (info) {
570 if (info->queue)
571 free_pages_exact(info->queue, size);
572 kfree(info->info_block);
573 }
574 kfree(info);
575 return ERR_PTR(err);
576 }
577
578 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev,
579 struct virtqueue *vqs[], int nvqs,
580 struct ccw1 *ccw)
581 {
582 int ret;
583 struct virtio_thinint_area *thinint_area = NULL;
584 struct airq_info *info;
585
586 thinint_area = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL);
587 if (!thinint_area) {
588 ret = -ENOMEM;
589 goto out;
590 }
591 /* Try to get an indicator. */
592 thinint_area->indicator = get_airq_indicator(vqs, nvqs,
593 &thinint_area->bit_nr,
594 &vcdev->airq_info);
595 if (!thinint_area->indicator) {
596 ret = -ENOSPC;
597 goto out;
598 }
599 info = vcdev->airq_info;
600 thinint_area->summary_indicator =
601 (unsigned long) &info->summary_indicator;
602 thinint_area->isc = VIRTIO_AIRQ_ISC;
603 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
604 ccw->flags = CCW_FLAG_SLI;
605 ccw->count = sizeof(*thinint_area);
606 ccw->cda = (__u32)(unsigned long)thinint_area;
607 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER);
608 if (ret) {
609 if (ret == -EOPNOTSUPP) {
610 /*
611 * The host does not support adapter interrupts
612 * for virtio-ccw, stop trying.
613 */
614 virtio_ccw_use_airq = 0;
615 pr_info("Adapter interrupts unsupported on host\n");
616 } else
617 dev_warn(&vcdev->cdev->dev,
618 "enabling adapter interrupts = %d\n", ret);
619 virtio_ccw_drop_indicators(vcdev);
620 }
621 out:
622 kfree(thinint_area);
623 return ret;
624 }
625
626 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
627 struct virtqueue *vqs[],
628 vq_callback_t *callbacks[],
629 const char * const names[])
630 {
631 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
632 unsigned long *indicatorp = NULL;
633 int ret, i;
634 struct ccw1 *ccw;
635
636 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
637 if (!ccw)
638 return -ENOMEM;
639
640 for (i = 0; i < nvqs; ++i) {
641 vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i],
642 ccw);
643 if (IS_ERR(vqs[i])) {
644 ret = PTR_ERR(vqs[i]);
645 vqs[i] = NULL;
646 goto out;
647 }
648 }
649 ret = -ENOMEM;
650 /*
651 * We need a data area under 2G to communicate. Our payload is
652 * the address of the indicators.
653 */
654 indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL);
655 if (!indicatorp)
656 goto out;
657 *indicatorp = (unsigned long) &vcdev->indicators;
658 if (vcdev->is_thinint) {
659 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw);
660 if (ret)
661 /* no error, just fall back to legacy interrupts */
662 vcdev->is_thinint = 0;
663 }
664 if (!vcdev->is_thinint) {
665 /* Register queue indicators with host. */
666 vcdev->indicators = 0;
667 ccw->cmd_code = CCW_CMD_SET_IND;
668 ccw->flags = 0;
669 ccw->count = sizeof(&vcdev->indicators);
670 ccw->cda = (__u32)(unsigned long) indicatorp;
671 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND);
672 if (ret)
673 goto out;
674 }
675 /* Register indicators2 with host for config changes */
676 *indicatorp = (unsigned long) &vcdev->indicators2;
677 vcdev->indicators2 = 0;
678 ccw->cmd_code = CCW_CMD_SET_CONF_IND;
679 ccw->flags = 0;
680 ccw->count = sizeof(&vcdev->indicators2);
681 ccw->cda = (__u32)(unsigned long) indicatorp;
682 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND);
683 if (ret)
684 goto out;
685
686 kfree(indicatorp);
687 kfree(ccw);
688 return 0;
689 out:
690 kfree(indicatorp);
691 kfree(ccw);
692 virtio_ccw_del_vqs(vdev);
693 return ret;
694 }
695
696 static void virtio_ccw_reset(struct virtio_device *vdev)
697 {
698 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
699 struct ccw1 *ccw;
700
701 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
702 if (!ccw)
703 return;
704
705 /* Zero status bits. */
706 *vcdev->status = 0;
707
708 /* Send a reset ccw on device. */
709 ccw->cmd_code = CCW_CMD_VDEV_RESET;
710 ccw->flags = 0;
711 ccw->count = 0;
712 ccw->cda = 0;
713 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET);
714 kfree(ccw);
715 }
716
717 static u64 virtio_ccw_get_features(struct virtio_device *vdev)
718 {
719 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
720 struct virtio_feature_desc *features;
721 int ret;
722 u64 rc;
723 struct ccw1 *ccw;
724
725 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
726 if (!ccw)
727 return 0;
728
729 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
730 if (!features) {
731 rc = 0;
732 goto out_free;
733 }
734 /* Read the feature bits from the host. */
735 features->index = 0;
736 ccw->cmd_code = CCW_CMD_READ_FEAT;
737 ccw->flags = 0;
738 ccw->count = sizeof(*features);
739 ccw->cda = (__u32)(unsigned long)features;
740 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
741 if (ret) {
742 rc = 0;
743 goto out_free;
744 }
745
746 rc = le32_to_cpu(features->features);
747
748 if (vcdev->revision == 0)
749 goto out_free;
750
751 /* Read second half of the feature bits from the host. */
752 features->index = 1;
753 ccw->cmd_code = CCW_CMD_READ_FEAT;
754 ccw->flags = 0;
755 ccw->count = sizeof(*features);
756 ccw->cda = (__u32)(unsigned long)features;
757 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
758 if (ret == 0)
759 rc |= (u64)le32_to_cpu(features->features) << 32;
760
761 out_free:
762 kfree(features);
763 kfree(ccw);
764 return rc;
765 }
766
767 static int virtio_ccw_finalize_features(struct virtio_device *vdev)
768 {
769 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
770 struct virtio_feature_desc *features;
771 struct ccw1 *ccw;
772 int ret;
773
774 if (vcdev->revision >= 1 &&
775 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
776 dev_err(&vdev->dev, "virtio: device uses revision 1 "
777 "but does not have VIRTIO_F_VERSION_1\n");
778 return -EINVAL;
779 }
780
781 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
782 if (!ccw)
783 return -ENOMEM;
784
785 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
786 if (!features) {
787 ret = -ENOMEM;
788 goto out_free;
789 }
790 /* Give virtio_ring a chance to accept features. */
791 vring_transport_features(vdev);
792
793 features->index = 0;
794 features->features = cpu_to_le32((u32)vdev->features);
795 /* Write the first half of the feature bits to the host. */
796 ccw->cmd_code = CCW_CMD_WRITE_FEAT;
797 ccw->flags = 0;
798 ccw->count = sizeof(*features);
799 ccw->cda = (__u32)(unsigned long)features;
800 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
801 if (ret)
802 goto out_free;
803
804 if (vcdev->revision == 0)
805 goto out_free;
806
807 features->index = 1;
808 features->features = cpu_to_le32(vdev->features >> 32);
809 /* Write the second half of the feature bits to the host. */
810 ccw->cmd_code = CCW_CMD_WRITE_FEAT;
811 ccw->flags = 0;
812 ccw->count = sizeof(*features);
813 ccw->cda = (__u32)(unsigned long)features;
814 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
815
816 out_free:
817 kfree(features);
818 kfree(ccw);
819
820 return ret;
821 }
822
823 static void virtio_ccw_get_config(struct virtio_device *vdev,
824 unsigned int offset, void *buf, unsigned len)
825 {
826 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
827 int ret;
828 struct ccw1 *ccw;
829 void *config_area;
830
831 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
832 if (!ccw)
833 return;
834
835 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
836 if (!config_area)
837 goto out_free;
838
839 /* Read the config area from the host. */
840 ccw->cmd_code = CCW_CMD_READ_CONF;
841 ccw->flags = 0;
842 ccw->count = offset + len;
843 ccw->cda = (__u32)(unsigned long)config_area;
844 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG);
845 if (ret)
846 goto out_free;
847
848 memcpy(vcdev->config, config_area, offset + len);
849 if (buf)
850 memcpy(buf, &vcdev->config[offset], len);
851 if (vcdev->config_ready < offset + len)
852 vcdev->config_ready = offset + len;
853
854 out_free:
855 kfree(config_area);
856 kfree(ccw);
857 }
858
859 static void virtio_ccw_set_config(struct virtio_device *vdev,
860 unsigned int offset, const void *buf,
861 unsigned len)
862 {
863 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
864 struct ccw1 *ccw;
865 void *config_area;
866
867 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
868 if (!ccw)
869 return;
870
871 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
872 if (!config_area)
873 goto out_free;
874
875 /* Make sure we don't overwrite fields. */
876 if (vcdev->config_ready < offset)
877 virtio_ccw_get_config(vdev, 0, NULL, offset);
878 memcpy(&vcdev->config[offset], buf, len);
879 /* Write the config area to the host. */
880 memcpy(config_area, vcdev->config, sizeof(vcdev->config));
881 ccw->cmd_code = CCW_CMD_WRITE_CONF;
882 ccw->flags = 0;
883 ccw->count = offset + len;
884 ccw->cda = (__u32)(unsigned long)config_area;
885 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG);
886
887 out_free:
888 kfree(config_area);
889 kfree(ccw);
890 }
891
892 static u8 virtio_ccw_get_status(struct virtio_device *vdev)
893 {
894 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
895
896 return *vcdev->status;
897 }
898
899 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status)
900 {
901 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
902 u8 old_status = *vcdev->status;
903 struct ccw1 *ccw;
904 int ret;
905
906 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
907 if (!ccw)
908 return;
909
910 /* Write the status to the host. */
911 *vcdev->status = status;
912 ccw->cmd_code = CCW_CMD_WRITE_STATUS;
913 ccw->flags = 0;
914 ccw->count = sizeof(status);
915 ccw->cda = (__u32)(unsigned long)vcdev->status;
916 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS);
917 /* Write failed? We assume status is unchanged. */
918 if (ret)
919 *vcdev->status = old_status;
920 kfree(ccw);
921 }
922
923 static struct virtio_config_ops virtio_ccw_config_ops = {
924 .get_features = virtio_ccw_get_features,
925 .finalize_features = virtio_ccw_finalize_features,
926 .get = virtio_ccw_get_config,
927 .set = virtio_ccw_set_config,
928 .get_status = virtio_ccw_get_status,
929 .set_status = virtio_ccw_set_status,
930 .reset = virtio_ccw_reset,
931 .find_vqs = virtio_ccw_find_vqs,
932 .del_vqs = virtio_ccw_del_vqs,
933 };
934
935
936 /*
937 * ccw bus driver related functions
938 */
939
940 static void virtio_ccw_release_dev(struct device *_d)
941 {
942 struct virtio_device *dev = dev_to_virtio(_d);
943 struct virtio_ccw_device *vcdev = to_vc_device(dev);
944
945 kfree(vcdev->status);
946 kfree(vcdev->config_block);
947 kfree(vcdev);
948 }
949
950 static int irb_is_error(struct irb *irb)
951 {
952 if (scsw_cstat(&irb->scsw) != 0)
953 return 1;
954 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))
955 return 1;
956 if (scsw_cc(&irb->scsw) != 0)
957 return 1;
958 return 0;
959 }
960
961 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev,
962 int index)
963 {
964 struct virtio_ccw_vq_info *info;
965 unsigned long flags;
966 struct virtqueue *vq;
967
968 vq = NULL;
969 spin_lock_irqsave(&vcdev->lock, flags);
970 list_for_each_entry(info, &vcdev->virtqueues, node) {
971 if (info->vq->index == index) {
972 vq = info->vq;
973 break;
974 }
975 }
976 spin_unlock_irqrestore(&vcdev->lock, flags);
977 return vq;
978 }
979
980 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev,
981 __u32 activity)
982 {
983 if (vcdev->curr_io & activity) {
984 switch (activity) {
985 case VIRTIO_CCW_DOING_READ_FEAT:
986 case VIRTIO_CCW_DOING_WRITE_FEAT:
987 case VIRTIO_CCW_DOING_READ_CONFIG:
988 case VIRTIO_CCW_DOING_WRITE_CONFIG:
989 case VIRTIO_CCW_DOING_WRITE_STATUS:
990 case VIRTIO_CCW_DOING_SET_VQ:
991 case VIRTIO_CCW_DOING_SET_IND:
992 case VIRTIO_CCW_DOING_SET_CONF_IND:
993 case VIRTIO_CCW_DOING_RESET:
994 case VIRTIO_CCW_DOING_READ_VQ_CONF:
995 case VIRTIO_CCW_DOING_SET_IND_ADAPTER:
996 case VIRTIO_CCW_DOING_SET_VIRTIO_REV:
997 vcdev->curr_io &= ~activity;
998 wake_up(&vcdev->wait_q);
999 break;
1000 default:
1001 /* don't know what to do... */
1002 dev_warn(&vcdev->cdev->dev,
1003 "Suspicious activity '%08x'\n", activity);
1004 WARN_ON(1);
1005 break;
1006 }
1007 }
1008 }
1009
1010 static void virtio_ccw_int_handler(struct ccw_device *cdev,
1011 unsigned long intparm,
1012 struct irb *irb)
1013 {
1014 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK;
1015 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1016 int i;
1017 struct virtqueue *vq;
1018
1019 if (!vcdev)
1020 return;
1021 if (IS_ERR(irb)) {
1022 vcdev->err = PTR_ERR(irb);
1023 virtio_ccw_check_activity(vcdev, activity);
1024 /* Don't poke around indicators, something's wrong. */
1025 return;
1026 }
1027 /* Check if it's a notification from the host. */
1028 if ((intparm == 0) &&
1029 (scsw_stctl(&irb->scsw) ==
1030 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) {
1031 /* OK */
1032 }
1033 if (irb_is_error(irb)) {
1034 /* Command reject? */
1035 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
1036 (irb->ecw[0] & SNS0_CMD_REJECT))
1037 vcdev->err = -EOPNOTSUPP;
1038 else
1039 /* Map everything else to -EIO. */
1040 vcdev->err = -EIO;
1041 }
1042 virtio_ccw_check_activity(vcdev, activity);
1043 for_each_set_bit(i, &vcdev->indicators,
1044 sizeof(vcdev->indicators) * BITS_PER_BYTE) {
1045 /* The bit clear must happen before the vring kick. */
1046 clear_bit(i, &vcdev->indicators);
1047 barrier();
1048 vq = virtio_ccw_vq_by_ind(vcdev, i);
1049 vring_interrupt(0, vq);
1050 }
1051 if (test_bit(0, &vcdev->indicators2)) {
1052 virtio_config_changed(&vcdev->vdev);
1053 clear_bit(0, &vcdev->indicators2);
1054 }
1055 }
1056
1057 /*
1058 * We usually want to autoonline all devices, but give the admin
1059 * a way to exempt devices from this.
1060 */
1061 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
1062 (8*sizeof(long)))
1063 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS];
1064
1065 static char *no_auto = "";
1066
1067 module_param(no_auto, charp, 0444);
1068 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined");
1069
1070 static int virtio_ccw_check_autoonline(struct ccw_device *cdev)
1071 {
1072 struct ccw_dev_id id;
1073
1074 ccw_device_get_id(cdev, &id);
1075 if (test_bit(id.devno, devs_no_auto[id.ssid]))
1076 return 0;
1077 return 1;
1078 }
1079
1080 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie)
1081 {
1082 struct ccw_device *cdev = data;
1083 int ret;
1084
1085 ret = ccw_device_set_online(cdev);
1086 if (ret)
1087 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret);
1088 }
1089
1090 static int virtio_ccw_probe(struct ccw_device *cdev)
1091 {
1092 cdev->handler = virtio_ccw_int_handler;
1093
1094 if (virtio_ccw_check_autoonline(cdev))
1095 async_schedule(virtio_ccw_auto_online, cdev);
1096 return 0;
1097 }
1098
1099 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev)
1100 {
1101 unsigned long flags;
1102 struct virtio_ccw_device *vcdev;
1103
1104 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1105 vcdev = dev_get_drvdata(&cdev->dev);
1106 if (!vcdev || vcdev->going_away) {
1107 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1108 return NULL;
1109 }
1110 vcdev->going_away = true;
1111 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1112 return vcdev;
1113 }
1114
1115 static void virtio_ccw_remove(struct ccw_device *cdev)
1116 {
1117 unsigned long flags;
1118 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1119
1120 if (vcdev && cdev->online) {
1121 if (vcdev->device_lost)
1122 virtio_break_device(&vcdev->vdev);
1123 unregister_virtio_device(&vcdev->vdev);
1124 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1125 dev_set_drvdata(&cdev->dev, NULL);
1126 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1127 }
1128 cdev->handler = NULL;
1129 }
1130
1131 static int virtio_ccw_offline(struct ccw_device *cdev)
1132 {
1133 unsigned long flags;
1134 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1135
1136 if (!vcdev)
1137 return 0;
1138 if (vcdev->device_lost)
1139 virtio_break_device(&vcdev->vdev);
1140 unregister_virtio_device(&vcdev->vdev);
1141 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1142 dev_set_drvdata(&cdev->dev, NULL);
1143 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1144 return 0;
1145 }
1146
1147 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev)
1148 {
1149 struct virtio_rev_info *rev;
1150 struct ccw1 *ccw;
1151 int ret;
1152
1153 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
1154 if (!ccw)
1155 return -ENOMEM;
1156 rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL);
1157 if (!rev) {
1158 kfree(ccw);
1159 return -ENOMEM;
1160 }
1161
1162 /* Set transport revision */
1163 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV;
1164 ccw->flags = 0;
1165 ccw->count = sizeof(*rev);
1166 ccw->cda = (__u32)(unsigned long)rev;
1167
1168 vcdev->revision = VIRTIO_CCW_REV_MAX;
1169 do {
1170 rev->revision = vcdev->revision;
1171 /* none of our supported revisions carry payload */
1172 rev->length = 0;
1173 ret = ccw_io_helper(vcdev, ccw,
1174 VIRTIO_CCW_DOING_SET_VIRTIO_REV);
1175 if (ret == -EOPNOTSUPP) {
1176 if (vcdev->revision == 0)
1177 /*
1178 * The host device does not support setting
1179 * the revision: let's operate it in legacy
1180 * mode.
1181 */
1182 ret = 0;
1183 else
1184 vcdev->revision--;
1185 }
1186 } while (ret == -EOPNOTSUPP);
1187
1188 kfree(ccw);
1189 kfree(rev);
1190 return ret;
1191 }
1192
1193 static int virtio_ccw_online(struct ccw_device *cdev)
1194 {
1195 int ret;
1196 struct virtio_ccw_device *vcdev;
1197 unsigned long flags;
1198
1199 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL);
1200 if (!vcdev) {
1201 dev_warn(&cdev->dev, "Could not get memory for virtio\n");
1202 ret = -ENOMEM;
1203 goto out_free;
1204 }
1205 vcdev->config_block = kzalloc(sizeof(*vcdev->config_block),
1206 GFP_DMA | GFP_KERNEL);
1207 if (!vcdev->config_block) {
1208 ret = -ENOMEM;
1209 goto out_free;
1210 }
1211 vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL);
1212 if (!vcdev->status) {
1213 ret = -ENOMEM;
1214 goto out_free;
1215 }
1216
1217 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */
1218
1219 vcdev->vdev.dev.parent = &cdev->dev;
1220 vcdev->vdev.dev.release = virtio_ccw_release_dev;
1221 vcdev->vdev.config = &virtio_ccw_config_ops;
1222 vcdev->cdev = cdev;
1223 init_waitqueue_head(&vcdev->wait_q);
1224 INIT_LIST_HEAD(&vcdev->virtqueues);
1225 spin_lock_init(&vcdev->lock);
1226
1227 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1228 dev_set_drvdata(&cdev->dev, vcdev);
1229 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1230 vcdev->vdev.id.vendor = cdev->id.cu_type;
1231 vcdev->vdev.id.device = cdev->id.cu_model;
1232
1233 ret = virtio_ccw_set_transport_rev(vcdev);
1234 if (ret)
1235 goto out_free;
1236
1237 ret = register_virtio_device(&vcdev->vdev);
1238 if (ret) {
1239 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n",
1240 ret);
1241 goto out_put;
1242 }
1243 return 0;
1244 out_put:
1245 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1246 dev_set_drvdata(&cdev->dev, NULL);
1247 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1248 put_device(&vcdev->vdev.dev);
1249 return ret;
1250 out_free:
1251 if (vcdev) {
1252 kfree(vcdev->status);
1253 kfree(vcdev->config_block);
1254 }
1255 kfree(vcdev);
1256 return ret;
1257 }
1258
1259 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event)
1260 {
1261 int rc;
1262 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1263
1264 /*
1265 * Make sure vcdev is set
1266 * i.e. set_offline/remove callback not already running
1267 */
1268 if (!vcdev)
1269 return NOTIFY_DONE;
1270
1271 switch (event) {
1272 case CIO_GONE:
1273 vcdev->device_lost = true;
1274 rc = NOTIFY_DONE;
1275 break;
1276 default:
1277 rc = NOTIFY_DONE;
1278 break;
1279 }
1280 return rc;
1281 }
1282
1283 static struct ccw_device_id virtio_ids[] = {
1284 { CCW_DEVICE(0x3832, 0) },
1285 {},
1286 };
1287
1288 static struct ccw_driver virtio_ccw_driver = {
1289 .driver = {
1290 .owner = THIS_MODULE,
1291 .name = "virtio_ccw",
1292 },
1293 .ids = virtio_ids,
1294 .probe = virtio_ccw_probe,
1295 .remove = virtio_ccw_remove,
1296 .set_offline = virtio_ccw_offline,
1297 .set_online = virtio_ccw_online,
1298 .notify = virtio_ccw_cio_notify,
1299 .int_class = IRQIO_VIR,
1300 };
1301
1302 static int __init pure_hex(char **cp, unsigned int *val, int min_digit,
1303 int max_digit, int max_val)
1304 {
1305 int diff;
1306
1307 diff = 0;
1308 *val = 0;
1309
1310 while (diff <= max_digit) {
1311 int value = hex_to_bin(**cp);
1312
1313 if (value < 0)
1314 break;
1315 *val = *val * 16 + value;
1316 (*cp)++;
1317 diff++;
1318 }
1319
1320 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
1321 return 1;
1322
1323 return 0;
1324 }
1325
1326 static int __init parse_busid(char *str, unsigned int *cssid,
1327 unsigned int *ssid, unsigned int *devno)
1328 {
1329 char *str_work;
1330 int rc, ret;
1331
1332 rc = 1;
1333
1334 if (*str == '\0')
1335 goto out;
1336
1337 str_work = str;
1338 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
1339 if (ret || (str_work[0] != '.'))
1340 goto out;
1341 str_work++;
1342 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
1343 if (ret || (str_work[0] != '.'))
1344 goto out;
1345 str_work++;
1346 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
1347 if (ret || (str_work[0] != '\0'))
1348 goto out;
1349
1350 rc = 0;
1351 out:
1352 return rc;
1353 }
1354
1355 static void __init no_auto_parse(void)
1356 {
1357 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
1358 char *parm, *str;
1359 int rc;
1360
1361 str = no_auto;
1362 while ((parm = strsep(&str, ","))) {
1363 rc = parse_busid(strsep(&parm, "-"), &from_cssid,
1364 &from_ssid, &from);
1365 if (rc)
1366 continue;
1367 if (parm != NULL) {
1368 rc = parse_busid(parm, &to_cssid,
1369 &to_ssid, &to);
1370 if ((from_ssid > to_ssid) ||
1371 ((from_ssid == to_ssid) && (from > to)))
1372 rc = -EINVAL;
1373 } else {
1374 to_cssid = from_cssid;
1375 to_ssid = from_ssid;
1376 to = from;
1377 }
1378 if (rc)
1379 continue;
1380 while ((from_ssid < to_ssid) ||
1381 ((from_ssid == to_ssid) && (from <= to))) {
1382 set_bit(from, devs_no_auto[from_ssid]);
1383 from++;
1384 if (from > __MAX_SUBCHANNEL) {
1385 from_ssid++;
1386 from = 0;
1387 }
1388 }
1389 }
1390 }
1391
1392 static int __init virtio_ccw_init(void)
1393 {
1394 /* parse no_auto string before we do anything further */
1395 no_auto_parse();
1396 return ccw_driver_register(&virtio_ccw_driver);
1397 }
1398 device_initcall(virtio_ccw_init);
Linux with added FPC-III support