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Linux 4.18.10
[linux/fpc-iii.git] / drivers / s390 / virtio / virtio_ccw.c
blob8f5c1d7f751aee594b763100c2bf6265df9f3a7d
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * ccw based virtio transport
4 *
5 * Copyright IBM Corp. 2012, 2014
6 *
7 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
8 */
9
10 #include <linux/kernel_stat.h>
11 #include <linux/init.h>
12 #include <linux/bootmem.h>
13 #include <linux/err.h>
14 #include <linux/virtio.h>
15 #include <linux/virtio_config.h>
16 #include <linux/slab.h>
17 #include <linux/interrupt.h>
18 #include <linux/virtio_ring.h>
19 #include <linux/pfn.h>
20 #include <linux/async.h>
21 #include <linux/wait.h>
22 #include <linux/list.h>
23 #include <linux/bitops.h>
24 #include <linux/moduleparam.h>
25 #include <linux/io.h>
26 #include <linux/kvm_para.h>
27 #include <linux/notifier.h>
28 #include <asm/diag.h>
29 #include <asm/setup.h>
30 #include <asm/irq.h>
31 #include <asm/cio.h>
32 #include <asm/ccwdev.h>
33 #include <asm/virtio-ccw.h>
34 #include <asm/isc.h>
35 #include <asm/airq.h>
36
37 /*
38 * virtio related functions
39 */
40
41 struct vq_config_block {
42 __u16 index;
43 __u16 num;
44 } __packed;
45
46 #define VIRTIO_CCW_CONFIG_SIZE 0x100
47 /* same as PCI config space size, should be enough for all drivers */
48
49 struct virtio_ccw_device {
50 struct virtio_device vdev;
51 __u8 *status;
52 __u8 config[VIRTIO_CCW_CONFIG_SIZE];
53 struct ccw_device *cdev;
54 __u32 curr_io;
55 int err;
56 unsigned int revision; /* Transport revision */
57 wait_queue_head_t wait_q;
58 spinlock_t lock;
59 struct list_head virtqueues;
60 unsigned long indicators;
61 unsigned long indicators2;
62 struct vq_config_block *config_block;
63 bool is_thinint;
64 bool going_away;
65 bool device_lost;
66 unsigned int config_ready;
67 void *airq_info;
68 };
69
70 struct vq_info_block_legacy {
71 __u64 queue;
72 __u32 align;
73 __u16 index;
74 __u16 num;
75 } __packed;
76
77 struct vq_info_block {
78 __u64 desc;
79 __u32 res0;
80 __u16 index;
81 __u16 num;
82 __u64 avail;
83 __u64 used;
84 } __packed;
85
86 struct virtio_feature_desc {
87 __le32 features;
88 __u8 index;
89 } __packed;
90
91 struct virtio_thinint_area {
92 unsigned long summary_indicator;
93 unsigned long indicator;
94 u64 bit_nr;
95 u8 isc;
96 } __packed;
97
98 struct virtio_rev_info {
99 __u16 revision;
100 __u16 length;
101 __u8 data[];
102 };
103
104 /* the highest virtio-ccw revision we support */
105 #define VIRTIO_CCW_REV_MAX 1
106
107 struct virtio_ccw_vq_info {
108 struct virtqueue *vq;
109 int num;
110 void *queue;
111 union {
112 struct vq_info_block s;
113 struct vq_info_block_legacy l;
114 } *info_block;
115 int bit_nr;
116 struct list_head node;
117 long cookie;
118 };
119
120 #define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */
121
122 #define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8)
123 #define MAX_AIRQ_AREAS 20
124
125 static int virtio_ccw_use_airq = 1;
126
127 struct airq_info {
128 rwlock_t lock;
129 u8 summary_indicator;
130 struct airq_struct airq;
131 struct airq_iv *aiv;
132 };
133 static struct airq_info *airq_areas[MAX_AIRQ_AREAS];
134
135 #define CCW_CMD_SET_VQ 0x13
136 #define CCW_CMD_VDEV_RESET 0x33
137 #define CCW_CMD_SET_IND 0x43
138 #define CCW_CMD_SET_CONF_IND 0x53
139 #define CCW_CMD_READ_FEAT 0x12
140 #define CCW_CMD_WRITE_FEAT 0x11
141 #define CCW_CMD_READ_CONF 0x22
142 #define CCW_CMD_WRITE_CONF 0x21
143 #define CCW_CMD_WRITE_STATUS 0x31
144 #define CCW_CMD_READ_VQ_CONF 0x32
145 #define CCW_CMD_READ_STATUS 0x72
146 #define CCW_CMD_SET_IND_ADAPTER 0x73
147 #define CCW_CMD_SET_VIRTIO_REV 0x83
148
149 #define VIRTIO_CCW_DOING_SET_VQ 0x00010000
150 #define VIRTIO_CCW_DOING_RESET 0x00040000
151 #define VIRTIO_CCW_DOING_READ_FEAT 0x00080000
152 #define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000
153 #define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000
154 #define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000
155 #define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000
156 #define VIRTIO_CCW_DOING_SET_IND 0x01000000
157 #define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000
158 #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000
159 #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000
160 #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000
161 #define VIRTIO_CCW_DOING_READ_STATUS 0x20000000
162 #define VIRTIO_CCW_INTPARM_MASK 0xffff0000
163
164 static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev)
165 {
166 return container_of(vdev, struct virtio_ccw_device, vdev);
167 }
168
169 static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info)
170 {
171 unsigned long i, flags;
172
173 write_lock_irqsave(&info->lock, flags);
174 for (i = 0; i < airq_iv_end(info->aiv); i++) {
175 if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) {
176 airq_iv_free_bit(info->aiv, i);
177 airq_iv_set_ptr(info->aiv, i, 0);
178 break;
179 }
180 }
181 write_unlock_irqrestore(&info->lock, flags);
182 }
183
184 static void virtio_airq_handler(struct airq_struct *airq)
185 {
186 struct airq_info *info = container_of(airq, struct airq_info, airq);
187 unsigned long ai;
188
189 inc_irq_stat(IRQIO_VAI);
190 read_lock(&info->lock);
191 /* Walk through indicators field, summary indicator active. */
192 for (ai = 0;;) {
193 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv));
194 if (ai == -1UL)
195 break;
196 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai));
197 }
198 info->summary_indicator = 0;
199 smp_wmb();
200 /* Walk through indicators field, summary indicator not active. */
201 for (ai = 0;;) {
202 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv));
203 if (ai == -1UL)
204 break;
205 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai));
206 }
207 read_unlock(&info->lock);
208 }
209
210 static struct airq_info *new_airq_info(void)
211 {
212 struct airq_info *info;
213 int rc;
214
215 info = kzalloc(sizeof(*info), GFP_KERNEL);
216 if (!info)
217 return NULL;
218 rwlock_init(&info->lock);
219 info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR);
220 if (!info->aiv) {
221 kfree(info);
222 return NULL;
223 }
224 info->airq.handler = virtio_airq_handler;
225 info->airq.lsi_ptr = &info->summary_indicator;
226 info->airq.lsi_mask = 0xff;
227 info->airq.isc = VIRTIO_AIRQ_ISC;
228 rc = register_adapter_interrupt(&info->airq);
229 if (rc) {
230 airq_iv_release(info->aiv);
231 kfree(info);
232 return NULL;
233 }
234 return info;
235 }
236
237 static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs,
238 u64 *first, void **airq_info)
239 {
240 int i, j;
241 struct airq_info *info;
242 unsigned long indicator_addr = 0;
243 unsigned long bit, flags;
244
245 for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) {
246 if (!airq_areas[i])
247 airq_areas[i] = new_airq_info();
248 info = airq_areas[i];
249 if (!info)
250 return 0;
251 write_lock_irqsave(&info->lock, flags);
252 bit = airq_iv_alloc(info->aiv, nvqs);
253 if (bit == -1UL) {
254 /* Not enough vacancies. */
255 write_unlock_irqrestore(&info->lock, flags);
256 continue;
257 }
258 *first = bit;
259 *airq_info = info;
260 indicator_addr = (unsigned long)info->aiv->vector;
261 for (j = 0; j < nvqs; j++) {
262 airq_iv_set_ptr(info->aiv, bit + j,
263 (unsigned long)vqs[j]);
264 }
265 write_unlock_irqrestore(&info->lock, flags);
266 }
267 return indicator_addr;
268 }
269
270 static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev)
271 {
272 struct virtio_ccw_vq_info *info;
273
274 list_for_each_entry(info, &vcdev->virtqueues, node)
275 drop_airq_indicator(info->vq, vcdev->airq_info);
276 }
277
278 static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag)
279 {
280 unsigned long flags;
281 __u32 ret;
282
283 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
284 if (vcdev->err)
285 ret = 0;
286 else
287 ret = vcdev->curr_io & flag;
288 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
289 return ret;
290 }
291
292 static int ccw_io_helper(struct virtio_ccw_device *vcdev,
293 struct ccw1 *ccw, __u32 intparm)
294 {
295 int ret;
296 unsigned long flags;
297 int flag = intparm & VIRTIO_CCW_INTPARM_MASK;
298
299 do {
300 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
301 ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0);
302 if (!ret) {
303 if (!vcdev->curr_io)
304 vcdev->err = 0;
305 vcdev->curr_io |= flag;
306 }
307 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
308 cpu_relax();
309 } while (ret == -EBUSY);
310 wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0);
311 return ret ? ret : vcdev->err;
312 }
313
314 static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev,
315 struct ccw1 *ccw)
316 {
317 int ret;
318 unsigned long *indicatorp = NULL;
319 struct virtio_thinint_area *thinint_area = NULL;
320 struct airq_info *airq_info = vcdev->airq_info;
321
322 if (vcdev->is_thinint) {
323 thinint_area = kzalloc(sizeof(*thinint_area),
324 GFP_DMA | GFP_KERNEL);
325 if (!thinint_area)
326 return;
327 thinint_area->summary_indicator =
328 (unsigned long) &airq_info->summary_indicator;
329 thinint_area->isc = VIRTIO_AIRQ_ISC;
330 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
331 ccw->count = sizeof(*thinint_area);
332 ccw->cda = (__u32)(unsigned long) thinint_area;
333 } else {
334 /* payload is the address of the indicators */
335 indicatorp = kmalloc(sizeof(&vcdev->indicators),
336 GFP_DMA | GFP_KERNEL);
337 if (!indicatorp)
338 return;
339 *indicatorp = 0;
340 ccw->cmd_code = CCW_CMD_SET_IND;
341 ccw->count = sizeof(&vcdev->indicators);
342 ccw->cda = (__u32)(unsigned long) indicatorp;
343 }
344 /* Deregister indicators from host. */
345 vcdev->indicators = 0;
346 ccw->flags = 0;
347 ret = ccw_io_helper(vcdev, ccw,
348 vcdev->is_thinint ?
349 VIRTIO_CCW_DOING_SET_IND_ADAPTER :
350 VIRTIO_CCW_DOING_SET_IND);
351 if (ret && (ret != -ENODEV))
352 dev_info(&vcdev->cdev->dev,
353 "Failed to deregister indicators (%d)\n", ret);
354 else if (vcdev->is_thinint)
355 virtio_ccw_drop_indicators(vcdev);
356 kfree(indicatorp);
357 kfree(thinint_area);
358 }
359
360 static inline long __do_kvm_notify(struct subchannel_id schid,
361 unsigned long queue_index,
362 long cookie)
363 {
364 register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY;
365 register struct subchannel_id __schid asm("2") = schid;
366 register unsigned long __index asm("3") = queue_index;
367 register long __rc asm("2");
368 register long __cookie asm("4") = cookie;
369
370 asm volatile ("diag 2,4,0x500\n"
371 : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index),
372 "d"(__cookie)
373 : "memory", "cc");
374 return __rc;
375 }
376
377 static inline long do_kvm_notify(struct subchannel_id schid,
378 unsigned long queue_index,
379 long cookie)
380 {
381 diag_stat_inc(DIAG_STAT_X500);
382 return __do_kvm_notify(schid, queue_index, cookie);
383 }
384
385 static bool virtio_ccw_kvm_notify(struct virtqueue *vq)
386 {
387 struct virtio_ccw_vq_info *info = vq->priv;
388 struct virtio_ccw_device *vcdev;
389 struct subchannel_id schid;
390
391 vcdev = to_vc_device(info->vq->vdev);
392 ccw_device_get_schid(vcdev->cdev, &schid);
393 info->cookie = do_kvm_notify(schid, vq->index, info->cookie);
394 if (info->cookie < 0)
395 return false;
396 return true;
397 }
398
399 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev,
400 struct ccw1 *ccw, int index)
401 {
402 int ret;
403
404 vcdev->config_block->index = index;
405 ccw->cmd_code = CCW_CMD_READ_VQ_CONF;
406 ccw->flags = 0;
407 ccw->count = sizeof(struct vq_config_block);
408 ccw->cda = (__u32)(unsigned long)(vcdev->config_block);
409 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF);
410 if (ret)
411 return ret;
412 return vcdev->config_block->num;
413 }
414
415 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw)
416 {
417 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev);
418 struct virtio_ccw_vq_info *info = vq->priv;
419 unsigned long flags;
420 unsigned long size;
421 int ret;
422 unsigned int index = vq->index;
423
424 /* Remove from our list. */
425 spin_lock_irqsave(&vcdev->lock, flags);
426 list_del(&info->node);
427 spin_unlock_irqrestore(&vcdev->lock, flags);
428
429 /* Release from host. */
430 if (vcdev->revision == 0) {
431 info->info_block->l.queue = 0;
432 info->info_block->l.align = 0;
433 info->info_block->l.index = index;
434 info->info_block->l.num = 0;
435 ccw->count = sizeof(info->info_block->l);
436 } else {
437 info->info_block->s.desc = 0;
438 info->info_block->s.index = index;
439 info->info_block->s.num = 0;
440 info->info_block->s.avail = 0;
441 info->info_block->s.used = 0;
442 ccw->count = sizeof(info->info_block->s);
443 }
444 ccw->cmd_code = CCW_CMD_SET_VQ;
445 ccw->flags = 0;
446 ccw->cda = (__u32)(unsigned long)(info->info_block);
447 ret = ccw_io_helper(vcdev, ccw,
448 VIRTIO_CCW_DOING_SET_VQ | index);
449 /*
450 * -ENODEV isn't considered an error: The device is gone anyway.
451 * This may happen on device detach.
452 */
453 if (ret && (ret != -ENODEV))
454 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n",
455 ret, index);
456
457 vring_del_virtqueue(vq);
458 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
459 free_pages_exact(info->queue, size);
460 kfree(info->info_block);
461 kfree(info);
462 }
463
464 static void virtio_ccw_del_vqs(struct virtio_device *vdev)
465 {
466 struct virtqueue *vq, *n;
467 struct ccw1 *ccw;
468 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
469
470 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
471 if (!ccw)
472 return;
473
474 virtio_ccw_drop_indicator(vcdev, ccw);
475
476 list_for_each_entry_safe(vq, n, &vdev->vqs, list)
477 virtio_ccw_del_vq(vq, ccw);
478
479 kfree(ccw);
480 }
481
482 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
483 int i, vq_callback_t *callback,
484 const char *name, bool ctx,
485 struct ccw1 *ccw)
486 {
487 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
488 int err;
489 struct virtqueue *vq = NULL;
490 struct virtio_ccw_vq_info *info;
491 unsigned long size = 0; /* silence the compiler */
492 unsigned long flags;
493
494 /* Allocate queue. */
495 info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL);
496 if (!info) {
497 dev_warn(&vcdev->cdev->dev, "no info\n");
498 err = -ENOMEM;
499 goto out_err;
500 }
501 info->info_block = kzalloc(sizeof(*info->info_block),
502 GFP_DMA | GFP_KERNEL);
503 if (!info->info_block) {
504 dev_warn(&vcdev->cdev->dev, "no info block\n");
505 err = -ENOMEM;
506 goto out_err;
507 }
508 info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i);
509 if (info->num < 0) {
510 err = info->num;
511 goto out_err;
512 }
513 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
514 info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
515 if (info->queue == NULL) {
516 dev_warn(&vcdev->cdev->dev, "no queue\n");
517 err = -ENOMEM;
518 goto out_err;
519 }
520
521 vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev,
522 true, ctx, info->queue, virtio_ccw_kvm_notify,
523 callback, name);
524 if (!vq) {
525 /* For now, we fail if we can't get the requested size. */
526 dev_warn(&vcdev->cdev->dev, "no vq\n");
527 err = -ENOMEM;
528 goto out_err;
529 }
530
531 /* Register it with the host. */
532 if (vcdev->revision == 0) {
533 info->info_block->l.queue = (__u64)info->queue;
534 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN;
535 info->info_block->l.index = i;
536 info->info_block->l.num = info->num;
537 ccw->count = sizeof(info->info_block->l);
538 } else {
539 info->info_block->s.desc = (__u64)info->queue;
540 info->info_block->s.index = i;
541 info->info_block->s.num = info->num;
542 info->info_block->s.avail = (__u64)virtqueue_get_avail(vq);
543 info->info_block->s.used = (__u64)virtqueue_get_used(vq);
544 ccw->count = sizeof(info->info_block->s);
545 }
546 ccw->cmd_code = CCW_CMD_SET_VQ;
547 ccw->flags = 0;
548 ccw->cda = (__u32)(unsigned long)(info->info_block);
549 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i);
550 if (err) {
551 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n");
552 goto out_err;
553 }
554
555 info->vq = vq;
556 vq->priv = info;
557
558 /* Save it to our list. */
559 spin_lock_irqsave(&vcdev->lock, flags);
560 list_add(&info->node, &vcdev->virtqueues);
561 spin_unlock_irqrestore(&vcdev->lock, flags);
562
563 return vq;
564
565 out_err:
566 if (vq)
567 vring_del_virtqueue(vq);
568 if (info) {
569 if (info->queue)
570 free_pages_exact(info->queue, size);
571 kfree(info->info_block);
572 }
573 kfree(info);
574 return ERR_PTR(err);
575 }
576
577 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev,
578 struct virtqueue *vqs[], int nvqs,
579 struct ccw1 *ccw)
580 {
581 int ret;
582 struct virtio_thinint_area *thinint_area = NULL;
583 struct airq_info *info;
584
585 thinint_area = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL);
586 if (!thinint_area) {
587 ret = -ENOMEM;
588 goto out;
589 }
590 /* Try to get an indicator. */
591 thinint_area->indicator = get_airq_indicator(vqs, nvqs,
592 &thinint_area->bit_nr,
593 &vcdev->airq_info);
594 if (!thinint_area->indicator) {
595 ret = -ENOSPC;
596 goto out;
597 }
598 info = vcdev->airq_info;
599 thinint_area->summary_indicator =
600 (unsigned long) &info->summary_indicator;
601 thinint_area->isc = VIRTIO_AIRQ_ISC;
602 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
603 ccw->flags = CCW_FLAG_SLI;
604 ccw->count = sizeof(*thinint_area);
605 ccw->cda = (__u32)(unsigned long)thinint_area;
606 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER);
607 if (ret) {
608 if (ret == -EOPNOTSUPP) {
609 /*
610 * The host does not support adapter interrupts
611 * for virtio-ccw, stop trying.
612 */
613 virtio_ccw_use_airq = 0;
614 pr_info("Adapter interrupts unsupported on host\n");
615 } else
616 dev_warn(&vcdev->cdev->dev,
617 "enabling adapter interrupts = %d\n", ret);
618 virtio_ccw_drop_indicators(vcdev);
619 }
620 out:
621 kfree(thinint_area);
622 return ret;
623 }
624
625 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
626 struct virtqueue *vqs[],
627 vq_callback_t *callbacks[],
628 const char * const names[],
629 const bool *ctx,
630 struct irq_affinity *desc)
631 {
632 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
633 unsigned long *indicatorp = NULL;
634 int ret, i;
635 struct ccw1 *ccw;
636
637 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
638 if (!ccw)
639 return -ENOMEM;
640
641 for (i = 0; i < nvqs; ++i) {
642 vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i],
643 ctx ? ctx[i] : false, ccw);
644 if (IS_ERR(vqs[i])) {
645 ret = PTR_ERR(vqs[i]);
646 vqs[i] = NULL;
647 goto out;
648 }
649 }
650 ret = -ENOMEM;
651 /*
652 * We need a data area under 2G to communicate. Our payload is
653 * the address of the indicators.
654 */
655 indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL);
656 if (!indicatorp)
657 goto out;
658 *indicatorp = (unsigned long) &vcdev->indicators;
659 if (vcdev->is_thinint) {
660 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw);
661 if (ret)
662 /* no error, just fall back to legacy interrupts */
663 vcdev->is_thinint = false;
664 }
665 if (!vcdev->is_thinint) {
666 /* Register queue indicators with host. */
667 vcdev->indicators = 0;
668 ccw->cmd_code = CCW_CMD_SET_IND;
669 ccw->flags = 0;
670 ccw->count = sizeof(&vcdev->indicators);
671 ccw->cda = (__u32)(unsigned long) indicatorp;
672 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND);
673 if (ret)
674 goto out;
675 }
676 /* Register indicators2 with host for config changes */
677 *indicatorp = (unsigned long) &vcdev->indicators2;
678 vcdev->indicators2 = 0;
679 ccw->cmd_code = CCW_CMD_SET_CONF_IND;
680 ccw->flags = 0;
681 ccw->count = sizeof(&vcdev->indicators2);
682 ccw->cda = (__u32)(unsigned long) indicatorp;
683 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND);
684 if (ret)
685 goto out;
686
687 kfree(indicatorp);
688 kfree(ccw);
689 return 0;
690 out:
691 kfree(indicatorp);
692 kfree(ccw);
693 virtio_ccw_del_vqs(vdev);
694 return ret;
695 }
696
697 static void virtio_ccw_reset(struct virtio_device *vdev)
698 {
699 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
700 struct ccw1 *ccw;
701
702 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
703 if (!ccw)
704 return;
705
706 /* Zero status bits. */
707 *vcdev->status = 0;
708
709 /* Send a reset ccw on device. */
710 ccw->cmd_code = CCW_CMD_VDEV_RESET;
711 ccw->flags = 0;
712 ccw->count = 0;
713 ccw->cda = 0;
714 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET);
715 kfree(ccw);
716 }
717
718 static u64 virtio_ccw_get_features(struct virtio_device *vdev)
719 {
720 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
721 struct virtio_feature_desc *features;
722 int ret;
723 u64 rc;
724 struct ccw1 *ccw;
725
726 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
727 if (!ccw)
728 return 0;
729
730 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
731 if (!features) {
732 rc = 0;
733 goto out_free;
734 }
735 /* Read the feature bits from the host. */
736 features->index = 0;
737 ccw->cmd_code = CCW_CMD_READ_FEAT;
738 ccw->flags = 0;
739 ccw->count = sizeof(*features);
740 ccw->cda = (__u32)(unsigned long)features;
741 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
742 if (ret) {
743 rc = 0;
744 goto out_free;
745 }
746
747 rc = le32_to_cpu(features->features);
748
749 if (vcdev->revision == 0)
750 goto out_free;
751
752 /* Read second half of the feature bits from the host. */
753 features->index = 1;
754 ccw->cmd_code = CCW_CMD_READ_FEAT;
755 ccw->flags = 0;
756 ccw->count = sizeof(*features);
757 ccw->cda = (__u32)(unsigned long)features;
758 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
759 if (ret == 0)
760 rc |= (u64)le32_to_cpu(features->features) << 32;
761
762 out_free:
763 kfree(features);
764 kfree(ccw);
765 return rc;
766 }
767
768 static int virtio_ccw_finalize_features(struct virtio_device *vdev)
769 {
770 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
771 struct virtio_feature_desc *features;
772 struct ccw1 *ccw;
773 int ret;
774
775 if (vcdev->revision >= 1 &&
776 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
777 dev_err(&vdev->dev, "virtio: device uses revision 1 "
778 "but does not have VIRTIO_F_VERSION_1\n");
779 return -EINVAL;
780 }
781
782 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
783 if (!ccw)
784 return -ENOMEM;
785
786 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
787 if (!features) {
788 ret = -ENOMEM;
789 goto out_free;
790 }
791 /* Give virtio_ring a chance to accept features. */
792 vring_transport_features(vdev);
793
794 features->index = 0;
795 features->features = cpu_to_le32((u32)vdev->features);
796 /* Write the first half of the feature bits to the host. */
797 ccw->cmd_code = CCW_CMD_WRITE_FEAT;
798 ccw->flags = 0;
799 ccw->count = sizeof(*features);
800 ccw->cda = (__u32)(unsigned long)features;
801 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
802 if (ret)
803 goto out_free;
804
805 if (vcdev->revision == 0)
806 goto out_free;
807
808 features->index = 1;
809 features->features = cpu_to_le32(vdev->features >> 32);
810 /* Write the second half of the feature bits to the host. */
811 ccw->cmd_code = CCW_CMD_WRITE_FEAT;
812 ccw->flags = 0;
813 ccw->count = sizeof(*features);
814 ccw->cda = (__u32)(unsigned long)features;
815 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
816
817 out_free:
818 kfree(features);
819 kfree(ccw);
820
821 return ret;
822 }
823
824 static void virtio_ccw_get_config(struct virtio_device *vdev,
825 unsigned int offset, void *buf, unsigned len)
826 {
827 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
828 int ret;
829 struct ccw1 *ccw;
830 void *config_area;
831
832 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
833 if (!ccw)
834 return;
835
836 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
837 if (!config_area)
838 goto out_free;
839
840 /* Read the config area from the host. */
841 ccw->cmd_code = CCW_CMD_READ_CONF;
842 ccw->flags = 0;
843 ccw->count = offset + len;
844 ccw->cda = (__u32)(unsigned long)config_area;
845 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG);
846 if (ret)
847 goto out_free;
848
849 memcpy(vcdev->config, config_area, offset + len);
850 if (buf)
851 memcpy(buf, &vcdev->config[offset], len);
852 if (vcdev->config_ready < offset + len)
853 vcdev->config_ready = offset + len;
854
855 out_free:
856 kfree(config_area);
857 kfree(ccw);
858 }
859
860 static void virtio_ccw_set_config(struct virtio_device *vdev,
861 unsigned int offset, const void *buf,
862 unsigned len)
863 {
864 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
865 struct ccw1 *ccw;
866 void *config_area;
867
868 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
869 if (!ccw)
870 return;
871
872 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
873 if (!config_area)
874 goto out_free;
875
876 /* Make sure we don't overwrite fields. */
877 if (vcdev->config_ready < offset)
878 virtio_ccw_get_config(vdev, 0, NULL, offset);
879 memcpy(&vcdev->config[offset], buf, len);
880 /* Write the config area to the host. */
881 memcpy(config_area, vcdev->config, sizeof(vcdev->config));
882 ccw->cmd_code = CCW_CMD_WRITE_CONF;
883 ccw->flags = 0;
884 ccw->count = offset + len;
885 ccw->cda = (__u32)(unsigned long)config_area;
886 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG);
887
888 out_free:
889 kfree(config_area);
890 kfree(ccw);
891 }
892
893 static u8 virtio_ccw_get_status(struct virtio_device *vdev)
894 {
895 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
896 u8 old_status = *vcdev->status;
897 struct ccw1 *ccw;
898
899 if (vcdev->revision < 1)
900 return *vcdev->status;
901
902 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
903 if (!ccw)
904 return old_status;
905
906 ccw->cmd_code = CCW_CMD_READ_STATUS;
907 ccw->flags = 0;
908 ccw->count = sizeof(*vcdev->status);
909 ccw->cda = (__u32)(unsigned long)vcdev->status;
910 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS);
911 /*
912 * If the channel program failed (should only happen if the device
913 * was hotunplugged, and then we clean up via the machine check
914 * handler anyway), vcdev->status was not overwritten and we just
915 * return the old status, which is fine.
916 */
917 kfree(ccw);
918
919 return *vcdev->status;
920 }
921
922 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status)
923 {
924 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
925 u8 old_status = *vcdev->status;
926 struct ccw1 *ccw;
927 int ret;
928
929 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
930 if (!ccw)
931 return;
932
933 /* Write the status to the host. */
934 *vcdev->status = status;
935 ccw->cmd_code = CCW_CMD_WRITE_STATUS;
936 ccw->flags = 0;
937 ccw->count = sizeof(status);
938 ccw->cda = (__u32)(unsigned long)vcdev->status;
939 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS);
940 /* Write failed? We assume status is unchanged. */
941 if (ret)
942 *vcdev->status = old_status;
943 kfree(ccw);
944 }
945
946 static const struct virtio_config_ops virtio_ccw_config_ops = {
947 .get_features = virtio_ccw_get_features,
948 .finalize_features = virtio_ccw_finalize_features,
949 .get = virtio_ccw_get_config,
950 .set = virtio_ccw_set_config,
951 .get_status = virtio_ccw_get_status,
952 .set_status = virtio_ccw_set_status,
953 .reset = virtio_ccw_reset,
954 .find_vqs = virtio_ccw_find_vqs,
955 .del_vqs = virtio_ccw_del_vqs,
956 };
957
958
959 /*
960 * ccw bus driver related functions
961 */
962
963 static void virtio_ccw_release_dev(struct device *_d)
964 {
965 struct virtio_device *dev = dev_to_virtio(_d);
966 struct virtio_ccw_device *vcdev = to_vc_device(dev);
967
968 kfree(vcdev->status);
969 kfree(vcdev->config_block);
970 kfree(vcdev);
971 }
972
973 static int irb_is_error(struct irb *irb)
974 {
975 if (scsw_cstat(&irb->scsw) != 0)
976 return 1;
977 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))
978 return 1;
979 if (scsw_cc(&irb->scsw) != 0)
980 return 1;
981 return 0;
982 }
983
984 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev,
985 int index)
986 {
987 struct virtio_ccw_vq_info *info;
988 unsigned long flags;
989 struct virtqueue *vq;
990
991 vq = NULL;
992 spin_lock_irqsave(&vcdev->lock, flags);
993 list_for_each_entry(info, &vcdev->virtqueues, node) {
994 if (info->vq->index == index) {
995 vq = info->vq;
996 break;
997 }
998 }
999 spin_unlock_irqrestore(&vcdev->lock, flags);
1000 return vq;
1001 }
1002
1003 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev,
1004 __u32 activity)
1005 {
1006 if (vcdev->curr_io & activity) {
1007 switch (activity) {
1008 case VIRTIO_CCW_DOING_READ_FEAT:
1009 case VIRTIO_CCW_DOING_WRITE_FEAT:
1010 case VIRTIO_CCW_DOING_READ_CONFIG:
1011 case VIRTIO_CCW_DOING_WRITE_CONFIG:
1012 case VIRTIO_CCW_DOING_WRITE_STATUS:
1013 case VIRTIO_CCW_DOING_READ_STATUS:
1014 case VIRTIO_CCW_DOING_SET_VQ:
1015 case VIRTIO_CCW_DOING_SET_IND:
1016 case VIRTIO_CCW_DOING_SET_CONF_IND:
1017 case VIRTIO_CCW_DOING_RESET:
1018 case VIRTIO_CCW_DOING_READ_VQ_CONF:
1019 case VIRTIO_CCW_DOING_SET_IND_ADAPTER:
1020 case VIRTIO_CCW_DOING_SET_VIRTIO_REV:
1021 vcdev->curr_io &= ~activity;
1022 wake_up(&vcdev->wait_q);
1023 break;
1024 default:
1025 /* don't know what to do... */
1026 dev_warn(&vcdev->cdev->dev,
1027 "Suspicious activity '%08x'\n", activity);
1028 WARN_ON(1);
1029 break;
1030 }
1031 }
1032 }
1033
1034 static void virtio_ccw_int_handler(struct ccw_device *cdev,
1035 unsigned long intparm,
1036 struct irb *irb)
1037 {
1038 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK;
1039 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1040 int i;
1041 struct virtqueue *vq;
1042
1043 if (!vcdev)
1044 return;
1045 if (IS_ERR(irb)) {
1046 vcdev->err = PTR_ERR(irb);
1047 virtio_ccw_check_activity(vcdev, activity);
1048 /* Don't poke around indicators, something's wrong. */
1049 return;
1050 }
1051 /* Check if it's a notification from the host. */
1052 if ((intparm == 0) &&
1053 (scsw_stctl(&irb->scsw) ==
1054 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) {
1055 /* OK */
1056 }
1057 if (irb_is_error(irb)) {
1058 /* Command reject? */
1059 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
1060 (irb->ecw[0] & SNS0_CMD_REJECT))
1061 vcdev->err = -EOPNOTSUPP;
1062 else
1063 /* Map everything else to -EIO. */
1064 vcdev->err = -EIO;
1065 }
1066 virtio_ccw_check_activity(vcdev, activity);
1067 for_each_set_bit(i, &vcdev->indicators,
1068 sizeof(vcdev->indicators) * BITS_PER_BYTE) {
1069 /* The bit clear must happen before the vring kick. */
1070 clear_bit(i, &vcdev->indicators);
1071 barrier();
1072 vq = virtio_ccw_vq_by_ind(vcdev, i);
1073 vring_interrupt(0, vq);
1074 }
1075 if (test_bit(0, &vcdev->indicators2)) {
1076 virtio_config_changed(&vcdev->vdev);
1077 clear_bit(0, &vcdev->indicators2);
1078 }
1079 }
1080
1081 /*
1082 * We usually want to autoonline all devices, but give the admin
1083 * a way to exempt devices from this.
1084 */
1085 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
1086 (8*sizeof(long)))
1087 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS];
1088
1089 static char *no_auto = "";
1090
1091 module_param(no_auto, charp, 0444);
1092 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined");
1093
1094 static int virtio_ccw_check_autoonline(struct ccw_device *cdev)
1095 {
1096 struct ccw_dev_id id;
1097
1098 ccw_device_get_id(cdev, &id);
1099 if (test_bit(id.devno, devs_no_auto[id.ssid]))
1100 return 0;
1101 return 1;
1102 }
1103
1104 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie)
1105 {
1106 struct ccw_device *cdev = data;
1107 int ret;
1108
1109 ret = ccw_device_set_online(cdev);
1110 if (ret)
1111 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret);
1112 }
1113
1114 static int virtio_ccw_probe(struct ccw_device *cdev)
1115 {
1116 cdev->handler = virtio_ccw_int_handler;
1117
1118 if (virtio_ccw_check_autoonline(cdev))
1119 async_schedule(virtio_ccw_auto_online, cdev);
1120 return 0;
1121 }
1122
1123 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev)
1124 {
1125 unsigned long flags;
1126 struct virtio_ccw_device *vcdev;
1127
1128 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1129 vcdev = dev_get_drvdata(&cdev->dev);
1130 if (!vcdev || vcdev->going_away) {
1131 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1132 return NULL;
1133 }
1134 vcdev->going_away = true;
1135 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1136 return vcdev;
1137 }
1138
1139 static void virtio_ccw_remove(struct ccw_device *cdev)
1140 {
1141 unsigned long flags;
1142 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1143
1144 if (vcdev && cdev->online) {
1145 if (vcdev->device_lost)
1146 virtio_break_device(&vcdev->vdev);
1147 unregister_virtio_device(&vcdev->vdev);
1148 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1149 dev_set_drvdata(&cdev->dev, NULL);
1150 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1151 }
1152 cdev->handler = NULL;
1153 }
1154
1155 static int virtio_ccw_offline(struct ccw_device *cdev)
1156 {
1157 unsigned long flags;
1158 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1159
1160 if (!vcdev)
1161 return 0;
1162 if (vcdev->device_lost)
1163 virtio_break_device(&vcdev->vdev);
1164 unregister_virtio_device(&vcdev->vdev);
1165 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1166 dev_set_drvdata(&cdev->dev, NULL);
1167 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1168 return 0;
1169 }
1170
1171 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev)
1172 {
1173 struct virtio_rev_info *rev;
1174 struct ccw1 *ccw;
1175 int ret;
1176
1177 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
1178 if (!ccw)
1179 return -ENOMEM;
1180 rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL);
1181 if (!rev) {
1182 kfree(ccw);
1183 return -ENOMEM;
1184 }
1185
1186 /* Set transport revision */
1187 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV;
1188 ccw->flags = 0;
1189 ccw->count = sizeof(*rev);
1190 ccw->cda = (__u32)(unsigned long)rev;
1191
1192 vcdev->revision = VIRTIO_CCW_REV_MAX;
1193 do {
1194 rev->revision = vcdev->revision;
1195 /* none of our supported revisions carry payload */
1196 rev->length = 0;
1197 ret = ccw_io_helper(vcdev, ccw,
1198 VIRTIO_CCW_DOING_SET_VIRTIO_REV);
1199 if (ret == -EOPNOTSUPP) {
1200 if (vcdev->revision == 0)
1201 /*
1202 * The host device does not support setting
1203 * the revision: let's operate it in legacy
1204 * mode.
1205 */
1206 ret = 0;
1207 else
1208 vcdev->revision--;
1209 }
1210 } while (ret == -EOPNOTSUPP);
1211
1212 kfree(ccw);
1213 kfree(rev);
1214 return ret;
1215 }
1216
1217 static int virtio_ccw_online(struct ccw_device *cdev)
1218 {
1219 int ret;
1220 struct virtio_ccw_device *vcdev;
1221 unsigned long flags;
1222
1223 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL);
1224 if (!vcdev) {
1225 dev_warn(&cdev->dev, "Could not get memory for virtio\n");
1226 ret = -ENOMEM;
1227 goto out_free;
1228 }
1229 vcdev->config_block = kzalloc(sizeof(*vcdev->config_block),
1230 GFP_DMA | GFP_KERNEL);
1231 if (!vcdev->config_block) {
1232 ret = -ENOMEM;
1233 goto out_free;
1234 }
1235 vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL);
1236 if (!vcdev->status) {
1237 ret = -ENOMEM;
1238 goto out_free;
1239 }
1240
1241 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */
1242
1243 vcdev->vdev.dev.parent = &cdev->dev;
1244 vcdev->vdev.dev.release = virtio_ccw_release_dev;
1245 vcdev->vdev.config = &virtio_ccw_config_ops;
1246 vcdev->cdev = cdev;
1247 init_waitqueue_head(&vcdev->wait_q);
1248 INIT_LIST_HEAD(&vcdev->virtqueues);
1249 spin_lock_init(&vcdev->lock);
1250
1251 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1252 dev_set_drvdata(&cdev->dev, vcdev);
1253 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1254 vcdev->vdev.id.vendor = cdev->id.cu_type;
1255 vcdev->vdev.id.device = cdev->id.cu_model;
1256
1257 ret = virtio_ccw_set_transport_rev(vcdev);
1258 if (ret)
1259 goto out_free;
1260
1261 ret = register_virtio_device(&vcdev->vdev);
1262 if (ret) {
1263 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n",
1264 ret);
1265 goto out_put;
1266 }
1267 return 0;
1268 out_put:
1269 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1270 dev_set_drvdata(&cdev->dev, NULL);
1271 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1272 put_device(&vcdev->vdev.dev);
1273 return ret;
1274 out_free:
1275 if (vcdev) {
1276 kfree(vcdev->status);
1277 kfree(vcdev->config_block);
1278 }
1279 kfree(vcdev);
1280 return ret;
1281 }
1282
1283 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event)
1284 {
1285 int rc;
1286 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1287
1288 /*
1289 * Make sure vcdev is set
1290 * i.e. set_offline/remove callback not already running
1291 */
1292 if (!vcdev)
1293 return NOTIFY_DONE;
1294
1295 switch (event) {
1296 case CIO_GONE:
1297 vcdev->device_lost = true;
1298 rc = NOTIFY_DONE;
1299 break;
1300 case CIO_OPER:
1301 rc = NOTIFY_OK;
1302 break;
1303 default:
1304 rc = NOTIFY_DONE;
1305 break;
1306 }
1307 return rc;
1308 }
1309
1310 static struct ccw_device_id virtio_ids[] = {
1311 { CCW_DEVICE(0x3832, 0) },
1312 {},
1313 };
1314
1315 #ifdef CONFIG_PM_SLEEP
1316 static int virtio_ccw_freeze(struct ccw_device *cdev)
1317 {
1318 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1319
1320 return virtio_device_freeze(&vcdev->vdev);
1321 }
1322
1323 static int virtio_ccw_restore(struct ccw_device *cdev)
1324 {
1325 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1326 int ret;
1327
1328 ret = virtio_ccw_set_transport_rev(vcdev);
1329 if (ret)
1330 return ret;
1331
1332 return virtio_device_restore(&vcdev->vdev);
1333 }
1334 #endif
1335
1336 static struct ccw_driver virtio_ccw_driver = {
1337 .driver = {
1338 .owner = THIS_MODULE,
1339 .name = "virtio_ccw",
1340 },
1341 .ids = virtio_ids,
1342 .probe = virtio_ccw_probe,
1343 .remove = virtio_ccw_remove,
1344 .set_offline = virtio_ccw_offline,
1345 .set_online = virtio_ccw_online,
1346 .notify = virtio_ccw_cio_notify,
1347 .int_class = IRQIO_VIR,
1348 #ifdef CONFIG_PM_SLEEP
1349 .freeze = virtio_ccw_freeze,
1350 .thaw = virtio_ccw_restore,
1351 .restore = virtio_ccw_restore,
1352 #endif
1353 };
1354
1355 static int __init pure_hex(char **cp, unsigned int *val, int min_digit,
1356 int max_digit, int max_val)
1357 {
1358 int diff;
1359
1360 diff = 0;
1361 *val = 0;
1362
1363 while (diff <= max_digit) {
1364 int value = hex_to_bin(**cp);
1365
1366 if (value < 0)
1367 break;
1368 *val = *val * 16 + value;
1369 (*cp)++;
1370 diff++;
1371 }
1372
1373 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
1374 return 1;
1375
1376 return 0;
1377 }
1378
1379 static int __init parse_busid(char *str, unsigned int *cssid,
1380 unsigned int *ssid, unsigned int *devno)
1381 {
1382 char *str_work;
1383 int rc, ret;
1384
1385 rc = 1;
1386
1387 if (*str == '\0')
1388 goto out;
1389
1390 str_work = str;
1391 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
1392 if (ret || (str_work[0] != '.'))
1393 goto out;
1394 str_work++;
1395 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
1396 if (ret || (str_work[0] != '.'))
1397 goto out;
1398 str_work++;
1399 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
1400 if (ret || (str_work[0] != '\0'))
1401 goto out;
1402
1403 rc = 0;
1404 out:
1405 return rc;
1406 }
1407
1408 static void __init no_auto_parse(void)
1409 {
1410 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
1411 char *parm, *str;
1412 int rc;
1413
1414 str = no_auto;
1415 while ((parm = strsep(&str, ","))) {
1416 rc = parse_busid(strsep(&parm, "-"), &from_cssid,
1417 &from_ssid, &from);
1418 if (rc)
1419 continue;
1420 if (parm != NULL) {
1421 rc = parse_busid(parm, &to_cssid,
1422 &to_ssid, &to);
1423 if ((from_ssid > to_ssid) ||
1424 ((from_ssid == to_ssid) && (from > to)))
1425 rc = -EINVAL;
1426 } else {
1427 to_cssid = from_cssid;
1428 to_ssid = from_ssid;
1429 to = from;
1430 }
1431 if (rc)
1432 continue;
1433 while ((from_ssid < to_ssid) ||
1434 ((from_ssid == to_ssid) && (from <= to))) {
1435 set_bit(from, devs_no_auto[from_ssid]);
1436 from++;
1437 if (from > __MAX_SUBCHANNEL) {
1438 from_ssid++;
1439 from = 0;
1440 }
1441 }
1442 }
1443 }
1444
1445 static int __init virtio_ccw_init(void)
1446 {
1447 /* parse no_auto string before we do anything further */
1448 no_auto_parse();
1449 return ccw_driver_register(&virtio_ccw_driver);
1450 }
1451 device_initcall(virtio_ccw_init);
Linux with added FPC-III support