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Merge tag 'sh-pfc-for-v5.1-tag2' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-focal-kernel.git] / drivers / s390 / virtio / virtio_ccw.c
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/memblock.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 mutex io_lock; /* Serializes I/O requests */
60 struct list_head virtqueues;
61 unsigned long indicators;
62 unsigned long indicators2;
63 struct vq_config_block *config_block;
64 bool is_thinint;
65 bool going_away;
66 bool device_lost;
67 unsigned int config_ready;
68 void *airq_info;
69 };
70
71 struct vq_info_block_legacy {
72 __u64 queue;
73 __u32 align;
74 __u16 index;
75 __u16 num;
76 } __packed;
77
78 struct vq_info_block {
79 __u64 desc;
80 __u32 res0;
81 __u16 index;
82 __u16 num;
83 __u64 avail;
84 __u64 used;
85 } __packed;
86
87 struct virtio_feature_desc {
88 __le32 features;
89 __u8 index;
90 } __packed;
91
92 struct virtio_thinint_area {
93 unsigned long summary_indicator;
94 unsigned long indicator;
95 u64 bit_nr;
96 u8 isc;
97 } __packed;
98
99 struct virtio_rev_info {
100 __u16 revision;
101 __u16 length;
102 __u8 data[];
103 };
104
105 /* the highest virtio-ccw revision we support */
106 #define VIRTIO_CCW_REV_MAX 1
107
108 struct virtio_ccw_vq_info {
109 struct virtqueue *vq;
110 int num;
111 void *queue;
112 union {
113 struct vq_info_block s;
114 struct vq_info_block_legacy l;
115 } *info_block;
116 int bit_nr;
117 struct list_head node;
118 long cookie;
119 };
120
121 #define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */
122
123 #define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8)
124 #define MAX_AIRQ_AREAS 20
125
126 static int virtio_ccw_use_airq = 1;
127
128 struct airq_info {
129 rwlock_t lock;
130 u8 summary_indicator;
131 struct airq_struct airq;
132 struct airq_iv *aiv;
133 };
134 static struct airq_info *airq_areas[MAX_AIRQ_AREAS];
135
136 #define CCW_CMD_SET_VQ 0x13
137 #define CCW_CMD_VDEV_RESET 0x33
138 #define CCW_CMD_SET_IND 0x43
139 #define CCW_CMD_SET_CONF_IND 0x53
140 #define CCW_CMD_READ_FEAT 0x12
141 #define CCW_CMD_WRITE_FEAT 0x11
142 #define CCW_CMD_READ_CONF 0x22
143 #define CCW_CMD_WRITE_CONF 0x21
144 #define CCW_CMD_WRITE_STATUS 0x31
145 #define CCW_CMD_READ_VQ_CONF 0x32
146 #define CCW_CMD_READ_STATUS 0x72
147 #define CCW_CMD_SET_IND_ADAPTER 0x73
148 #define CCW_CMD_SET_VIRTIO_REV 0x83
149
150 #define VIRTIO_CCW_DOING_SET_VQ 0x00010000
151 #define VIRTIO_CCW_DOING_RESET 0x00040000
152 #define VIRTIO_CCW_DOING_READ_FEAT 0x00080000
153 #define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000
154 #define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000
155 #define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000
156 #define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000
157 #define VIRTIO_CCW_DOING_SET_IND 0x01000000
158 #define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000
159 #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000
160 #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000
161 #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000
162 #define VIRTIO_CCW_DOING_READ_STATUS 0x20000000
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 mutex_lock(&vcdev->io_lock);
301 do {
302 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
303 ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0);
304 if (!ret) {
305 if (!vcdev->curr_io)
306 vcdev->err = 0;
307 vcdev->curr_io |= flag;
308 }
309 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
310 cpu_relax();
311 } while (ret == -EBUSY);
312 wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0);
313 ret = ret ? ret : vcdev->err;
314 mutex_unlock(&vcdev->io_lock);
315 return ret;
316 }
317
318 static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev,
319 struct ccw1 *ccw)
320 {
321 int ret;
322 unsigned long *indicatorp = NULL;
323 struct virtio_thinint_area *thinint_area = NULL;
324 struct airq_info *airq_info = vcdev->airq_info;
325
326 if (vcdev->is_thinint) {
327 thinint_area = kzalloc(sizeof(*thinint_area),
328 GFP_DMA | GFP_KERNEL);
329 if (!thinint_area)
330 return;
331 thinint_area->summary_indicator =
332 (unsigned long) &airq_info->summary_indicator;
333 thinint_area->isc = VIRTIO_AIRQ_ISC;
334 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
335 ccw->count = sizeof(*thinint_area);
336 ccw->cda = (__u32)(unsigned long) thinint_area;
337 } else {
338 /* payload is the address of the indicators */
339 indicatorp = kmalloc(sizeof(&vcdev->indicators),
340 GFP_DMA | GFP_KERNEL);
341 if (!indicatorp)
342 return;
343 *indicatorp = 0;
344 ccw->cmd_code = CCW_CMD_SET_IND;
345 ccw->count = sizeof(&vcdev->indicators);
346 ccw->cda = (__u32)(unsigned long) indicatorp;
347 }
348 /* Deregister indicators from host. */
349 vcdev->indicators = 0;
350 ccw->flags = 0;
351 ret = ccw_io_helper(vcdev, ccw,
352 vcdev->is_thinint ?
353 VIRTIO_CCW_DOING_SET_IND_ADAPTER :
354 VIRTIO_CCW_DOING_SET_IND);
355 if (ret && (ret != -ENODEV))
356 dev_info(&vcdev->cdev->dev,
357 "Failed to deregister indicators (%d)\n", ret);
358 else if (vcdev->is_thinint)
359 virtio_ccw_drop_indicators(vcdev);
360 kfree(indicatorp);
361 kfree(thinint_area);
362 }
363
364 static inline long __do_kvm_notify(struct subchannel_id schid,
365 unsigned long queue_index,
366 long cookie)
367 {
368 register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY;
369 register struct subchannel_id __schid asm("2") = schid;
370 register unsigned long __index asm("3") = queue_index;
371 register long __rc asm("2");
372 register long __cookie asm("4") = cookie;
373
374 asm volatile ("diag 2,4,0x500\n"
375 : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index),
376 "d"(__cookie)
377 : "memory", "cc");
378 return __rc;
379 }
380
381 static inline long do_kvm_notify(struct subchannel_id schid,
382 unsigned long queue_index,
383 long cookie)
384 {
385 diag_stat_inc(DIAG_STAT_X500);
386 return __do_kvm_notify(schid, queue_index, cookie);
387 }
388
389 static bool virtio_ccw_kvm_notify(struct virtqueue *vq)
390 {
391 struct virtio_ccw_vq_info *info = vq->priv;
392 struct virtio_ccw_device *vcdev;
393 struct subchannel_id schid;
394
395 vcdev = to_vc_device(info->vq->vdev);
396 ccw_device_get_schid(vcdev->cdev, &schid);
397 info->cookie = do_kvm_notify(schid, vq->index, info->cookie);
398 if (info->cookie < 0)
399 return false;
400 return true;
401 }
402
403 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev,
404 struct ccw1 *ccw, int index)
405 {
406 int ret;
407
408 vcdev->config_block->index = index;
409 ccw->cmd_code = CCW_CMD_READ_VQ_CONF;
410 ccw->flags = 0;
411 ccw->count = sizeof(struct vq_config_block);
412 ccw->cda = (__u32)(unsigned long)(vcdev->config_block);
413 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF);
414 if (ret)
415 return ret;
416 return vcdev->config_block->num;
417 }
418
419 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw)
420 {
421 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev);
422 struct virtio_ccw_vq_info *info = vq->priv;
423 unsigned long flags;
424 unsigned long size;
425 int ret;
426 unsigned int index = vq->index;
427
428 /* Remove from our list. */
429 spin_lock_irqsave(&vcdev->lock, flags);
430 list_del(&info->node);
431 spin_unlock_irqrestore(&vcdev->lock, flags);
432
433 /* Release from host. */
434 if (vcdev->revision == 0) {
435 info->info_block->l.queue = 0;
436 info->info_block->l.align = 0;
437 info->info_block->l.index = index;
438 info->info_block->l.num = 0;
439 ccw->count = sizeof(info->info_block->l);
440 } else {
441 info->info_block->s.desc = 0;
442 info->info_block->s.index = index;
443 info->info_block->s.num = 0;
444 info->info_block->s.avail = 0;
445 info->info_block->s.used = 0;
446 ccw->count = sizeof(info->info_block->s);
447 }
448 ccw->cmd_code = CCW_CMD_SET_VQ;
449 ccw->flags = 0;
450 ccw->cda = (__u32)(unsigned long)(info->info_block);
451 ret = ccw_io_helper(vcdev, ccw,
452 VIRTIO_CCW_DOING_SET_VQ | index);
453 /*
454 * -ENODEV isn't considered an error: The device is gone anyway.
455 * This may happen on device detach.
456 */
457 if (ret && (ret != -ENODEV))
458 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n",
459 ret, index);
460
461 vring_del_virtqueue(vq);
462 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
463 free_pages_exact(info->queue, size);
464 kfree(info->info_block);
465 kfree(info);
466 }
467
468 static void virtio_ccw_del_vqs(struct virtio_device *vdev)
469 {
470 struct virtqueue *vq, *n;
471 struct ccw1 *ccw;
472 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
473
474 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
475 if (!ccw)
476 return;
477
478 virtio_ccw_drop_indicator(vcdev, ccw);
479
480 list_for_each_entry_safe(vq, n, &vdev->vqs, list)
481 virtio_ccw_del_vq(vq, ccw);
482
483 kfree(ccw);
484 }
485
486 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
487 int i, vq_callback_t *callback,
488 const char *name, bool ctx,
489 struct ccw1 *ccw)
490 {
491 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
492 int err;
493 struct virtqueue *vq = NULL;
494 struct virtio_ccw_vq_info *info;
495 unsigned long size = 0; /* silence the compiler */
496 unsigned long flags;
497
498 /* Allocate queue. */
499 info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL);
500 if (!info) {
501 dev_warn(&vcdev->cdev->dev, "no info\n");
502 err = -ENOMEM;
503 goto out_err;
504 }
505 info->info_block = kzalloc(sizeof(*info->info_block),
506 GFP_DMA | GFP_KERNEL);
507 if (!info->info_block) {
508 dev_warn(&vcdev->cdev->dev, "no info block\n");
509 err = -ENOMEM;
510 goto out_err;
511 }
512 info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i);
513 if (info->num < 0) {
514 err = info->num;
515 goto out_err;
516 }
517 size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
518 info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
519 if (info->queue == NULL) {
520 dev_warn(&vcdev->cdev->dev, "no queue\n");
521 err = -ENOMEM;
522 goto out_err;
523 }
524
525 vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev,
526 true, ctx, info->queue, virtio_ccw_kvm_notify,
527 callback, name);
528 if (!vq) {
529 /* For now, we fail if we can't get the requested size. */
530 dev_warn(&vcdev->cdev->dev, "no vq\n");
531 err = -ENOMEM;
532 goto out_err;
533 }
534
535 /* Register it with the host. */
536 if (vcdev->revision == 0) {
537 info->info_block->l.queue = (__u64)info->queue;
538 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN;
539 info->info_block->l.index = i;
540 info->info_block->l.num = info->num;
541 ccw->count = sizeof(info->info_block->l);
542 } else {
543 info->info_block->s.desc = (__u64)info->queue;
544 info->info_block->s.index = i;
545 info->info_block->s.num = info->num;
546 info->info_block->s.avail = (__u64)virtqueue_get_avail(vq);
547 info->info_block->s.used = (__u64)virtqueue_get_used(vq);
548 ccw->count = sizeof(info->info_block->s);
549 }
550 ccw->cmd_code = CCW_CMD_SET_VQ;
551 ccw->flags = 0;
552 ccw->cda = (__u32)(unsigned long)(info->info_block);
553 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i);
554 if (err) {
555 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n");
556 goto out_err;
557 }
558
559 info->vq = vq;
560 vq->priv = info;
561
562 /* Save it to our list. */
563 spin_lock_irqsave(&vcdev->lock, flags);
564 list_add(&info->node, &vcdev->virtqueues);
565 spin_unlock_irqrestore(&vcdev->lock, flags);
566
567 return vq;
568
569 out_err:
570 if (vq)
571 vring_del_virtqueue(vq);
572 if (info) {
573 if (info->queue)
574 free_pages_exact(info->queue, size);
575 kfree(info->info_block);
576 }
577 kfree(info);
578 return ERR_PTR(err);
579 }
580
581 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev,
582 struct virtqueue *vqs[], int nvqs,
583 struct ccw1 *ccw)
584 {
585 int ret;
586 struct virtio_thinint_area *thinint_area = NULL;
587 struct airq_info *info;
588
589 thinint_area = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL);
590 if (!thinint_area) {
591 ret = -ENOMEM;
592 goto out;
593 }
594 /* Try to get an indicator. */
595 thinint_area->indicator = get_airq_indicator(vqs, nvqs,
596 &thinint_area->bit_nr,
597 &vcdev->airq_info);
598 if (!thinint_area->indicator) {
599 ret = -ENOSPC;
600 goto out;
601 }
602 info = vcdev->airq_info;
603 thinint_area->summary_indicator =
604 (unsigned long) &info->summary_indicator;
605 thinint_area->isc = VIRTIO_AIRQ_ISC;
606 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
607 ccw->flags = CCW_FLAG_SLI;
608 ccw->count = sizeof(*thinint_area);
609 ccw->cda = (__u32)(unsigned long)thinint_area;
610 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER);
611 if (ret) {
612 if (ret == -EOPNOTSUPP) {
613 /*
614 * The host does not support adapter interrupts
615 * for virtio-ccw, stop trying.
616 */
617 virtio_ccw_use_airq = 0;
618 pr_info("Adapter interrupts unsupported on host\n");
619 } else
620 dev_warn(&vcdev->cdev->dev,
621 "enabling adapter interrupts = %d\n", ret);
622 virtio_ccw_drop_indicators(vcdev);
623 }
624 out:
625 kfree(thinint_area);
626 return ret;
627 }
628
629 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
630 struct virtqueue *vqs[],
631 vq_callback_t *callbacks[],
632 const char * const names[],
633 const bool *ctx,
634 struct irq_affinity *desc)
635 {
636 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
637 unsigned long *indicatorp = NULL;
638 int ret, i, queue_idx = 0;
639 struct ccw1 *ccw;
640
641 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
642 if (!ccw)
643 return -ENOMEM;
644
645 for (i = 0; i < nvqs; ++i) {
646 if (!names[i]) {
647 vqs[i] = NULL;
648 continue;
649 }
650
651 vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, callbacks[i],
652 names[i], ctx ? ctx[i] : false,
653 ccw);
654 if (IS_ERR(vqs[i])) {
655 ret = PTR_ERR(vqs[i]);
656 vqs[i] = NULL;
657 goto out;
658 }
659 }
660 ret = -ENOMEM;
661 /*
662 * We need a data area under 2G to communicate. Our payload is
663 * the address of the indicators.
664 */
665 indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL);
666 if (!indicatorp)
667 goto out;
668 *indicatorp = (unsigned long) &vcdev->indicators;
669 if (vcdev->is_thinint) {
670 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw);
671 if (ret)
672 /* no error, just fall back to legacy interrupts */
673 vcdev->is_thinint = false;
674 }
675 if (!vcdev->is_thinint) {
676 /* Register queue indicators with host. */
677 vcdev->indicators = 0;
678 ccw->cmd_code = CCW_CMD_SET_IND;
679 ccw->flags = 0;
680 ccw->count = sizeof(&vcdev->indicators);
681 ccw->cda = (__u32)(unsigned long) indicatorp;
682 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND);
683 if (ret)
684 goto out;
685 }
686 /* Register indicators2 with host for config changes */
687 *indicatorp = (unsigned long) &vcdev->indicators2;
688 vcdev->indicators2 = 0;
689 ccw->cmd_code = CCW_CMD_SET_CONF_IND;
690 ccw->flags = 0;
691 ccw->count = sizeof(&vcdev->indicators2);
692 ccw->cda = (__u32)(unsigned long) indicatorp;
693 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND);
694 if (ret)
695 goto out;
696
697 kfree(indicatorp);
698 kfree(ccw);
699 return 0;
700 out:
701 kfree(indicatorp);
702 kfree(ccw);
703 virtio_ccw_del_vqs(vdev);
704 return ret;
705 }
706
707 static void virtio_ccw_reset(struct virtio_device *vdev)
708 {
709 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
710 struct ccw1 *ccw;
711
712 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
713 if (!ccw)
714 return;
715
716 /* Zero status bits. */
717 *vcdev->status = 0;
718
719 /* Send a reset ccw on device. */
720 ccw->cmd_code = CCW_CMD_VDEV_RESET;
721 ccw->flags = 0;
722 ccw->count = 0;
723 ccw->cda = 0;
724 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET);
725 kfree(ccw);
726 }
727
728 static u64 virtio_ccw_get_features(struct virtio_device *vdev)
729 {
730 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
731 struct virtio_feature_desc *features;
732 int ret;
733 u64 rc;
734 struct ccw1 *ccw;
735
736 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
737 if (!ccw)
738 return 0;
739
740 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
741 if (!features) {
742 rc = 0;
743 goto out_free;
744 }
745 /* Read the feature bits from the host. */
746 features->index = 0;
747 ccw->cmd_code = CCW_CMD_READ_FEAT;
748 ccw->flags = 0;
749 ccw->count = sizeof(*features);
750 ccw->cda = (__u32)(unsigned long)features;
751 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
752 if (ret) {
753 rc = 0;
754 goto out_free;
755 }
756
757 rc = le32_to_cpu(features->features);
758
759 if (vcdev->revision == 0)
760 goto out_free;
761
762 /* Read second half of the feature bits from the host. */
763 features->index = 1;
764 ccw->cmd_code = CCW_CMD_READ_FEAT;
765 ccw->flags = 0;
766 ccw->count = sizeof(*features);
767 ccw->cda = (__u32)(unsigned long)features;
768 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
769 if (ret == 0)
770 rc |= (u64)le32_to_cpu(features->features) << 32;
771
772 out_free:
773 kfree(features);
774 kfree(ccw);
775 return rc;
776 }
777
778 static void ccw_transport_features(struct virtio_device *vdev)
779 {
780 /*
781 * Packed ring isn't enabled on virtio_ccw for now,
782 * because virtio_ccw uses some legacy accessors,
783 * e.g. virtqueue_get_avail() and virtqueue_get_used()
784 * which aren't available in packed ring currently.
785 */
786 __virtio_clear_bit(vdev, VIRTIO_F_RING_PACKED);
787 }
788
789 static int virtio_ccw_finalize_features(struct virtio_device *vdev)
790 {
791 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
792 struct virtio_feature_desc *features;
793 struct ccw1 *ccw;
794 int ret;
795
796 if (vcdev->revision >= 1 &&
797 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
798 dev_err(&vdev->dev, "virtio: device uses revision 1 "
799 "but does not have VIRTIO_F_VERSION_1\n");
800 return -EINVAL;
801 }
802
803 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
804 if (!ccw)
805 return -ENOMEM;
806
807 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
808 if (!features) {
809 ret = -ENOMEM;
810 goto out_free;
811 }
812 /* Give virtio_ring a chance to accept features. */
813 vring_transport_features(vdev);
814
815 /* Give virtio_ccw a chance to accept features. */
816 ccw_transport_features(vdev);
817
818 features->index = 0;
819 features->features = cpu_to_le32((u32)vdev->features);
820 /* Write the first half of the feature bits to the host. */
821 ccw->cmd_code = CCW_CMD_WRITE_FEAT;
822 ccw->flags = 0;
823 ccw->count = sizeof(*features);
824 ccw->cda = (__u32)(unsigned long)features;
825 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
826 if (ret)
827 goto out_free;
828
829 if (vcdev->revision == 0)
830 goto out_free;
831
832 features->index = 1;
833 features->features = cpu_to_le32(vdev->features >> 32);
834 /* Write the second half of the feature bits to the host. */
835 ccw->cmd_code = CCW_CMD_WRITE_FEAT;
836 ccw->flags = 0;
837 ccw->count = sizeof(*features);
838 ccw->cda = (__u32)(unsigned long)features;
839 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
840
841 out_free:
842 kfree(features);
843 kfree(ccw);
844
845 return ret;
846 }
847
848 static void virtio_ccw_get_config(struct virtio_device *vdev,
849 unsigned int offset, void *buf, unsigned len)
850 {
851 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
852 int ret;
853 struct ccw1 *ccw;
854 void *config_area;
855 unsigned long flags;
856
857 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
858 if (!ccw)
859 return;
860
861 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
862 if (!config_area)
863 goto out_free;
864
865 /* Read the config area from the host. */
866 ccw->cmd_code = CCW_CMD_READ_CONF;
867 ccw->flags = 0;
868 ccw->count = offset + len;
869 ccw->cda = (__u32)(unsigned long)config_area;
870 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG);
871 if (ret)
872 goto out_free;
873
874 spin_lock_irqsave(&vcdev->lock, flags);
875 memcpy(vcdev->config, config_area, offset + len);
876 if (vcdev->config_ready < offset + len)
877 vcdev->config_ready = offset + len;
878 spin_unlock_irqrestore(&vcdev->lock, flags);
879 if (buf)
880 memcpy(buf, config_area + offset, len);
881
882 out_free:
883 kfree(config_area);
884 kfree(ccw);
885 }
886
887 static void virtio_ccw_set_config(struct virtio_device *vdev,
888 unsigned int offset, const void *buf,
889 unsigned len)
890 {
891 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
892 struct ccw1 *ccw;
893 void *config_area;
894 unsigned long flags;
895
896 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
897 if (!ccw)
898 return;
899
900 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
901 if (!config_area)
902 goto out_free;
903
904 /* Make sure we don't overwrite fields. */
905 if (vcdev->config_ready < offset)
906 virtio_ccw_get_config(vdev, 0, NULL, offset);
907 spin_lock_irqsave(&vcdev->lock, flags);
908 memcpy(&vcdev->config[offset], buf, len);
909 /* Write the config area to the host. */
910 memcpy(config_area, vcdev->config, sizeof(vcdev->config));
911 spin_unlock_irqrestore(&vcdev->lock, flags);
912 ccw->cmd_code = CCW_CMD_WRITE_CONF;
913 ccw->flags = 0;
914 ccw->count = offset + len;
915 ccw->cda = (__u32)(unsigned long)config_area;
916 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG);
917
918 out_free:
919 kfree(config_area);
920 kfree(ccw);
921 }
922
923 static u8 virtio_ccw_get_status(struct virtio_device *vdev)
924 {
925 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
926 u8 old_status = *vcdev->status;
927 struct ccw1 *ccw;
928
929 if (vcdev->revision < 1)
930 return *vcdev->status;
931
932 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
933 if (!ccw)
934 return old_status;
935
936 ccw->cmd_code = CCW_CMD_READ_STATUS;
937 ccw->flags = 0;
938 ccw->count = sizeof(*vcdev->status);
939 ccw->cda = (__u32)(unsigned long)vcdev->status;
940 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS);
941 /*
942 * If the channel program failed (should only happen if the device
943 * was hotunplugged, and then we clean up via the machine check
944 * handler anyway), vcdev->status was not overwritten and we just
945 * return the old status, which is fine.
946 */
947 kfree(ccw);
948
949 return *vcdev->status;
950 }
951
952 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status)
953 {
954 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
955 u8 old_status = *vcdev->status;
956 struct ccw1 *ccw;
957 int ret;
958
959 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
960 if (!ccw)
961 return;
962
963 /* Write the status to the host. */
964 *vcdev->status = status;
965 ccw->cmd_code = CCW_CMD_WRITE_STATUS;
966 ccw->flags = 0;
967 ccw->count = sizeof(status);
968 ccw->cda = (__u32)(unsigned long)vcdev->status;
969 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS);
970 /* Write failed? We assume status is unchanged. */
971 if (ret)
972 *vcdev->status = old_status;
973 kfree(ccw);
974 }
975
976 static const struct virtio_config_ops virtio_ccw_config_ops = {
977 .get_features = virtio_ccw_get_features,
978 .finalize_features = virtio_ccw_finalize_features,
979 .get = virtio_ccw_get_config,
980 .set = virtio_ccw_set_config,
981 .get_status = virtio_ccw_get_status,
982 .set_status = virtio_ccw_set_status,
983 .reset = virtio_ccw_reset,
984 .find_vqs = virtio_ccw_find_vqs,
985 .del_vqs = virtio_ccw_del_vqs,
986 };
987
988
989 /*
990 * ccw bus driver related functions
991 */
992
993 static void virtio_ccw_release_dev(struct device *_d)
994 {
995 struct virtio_device *dev = dev_to_virtio(_d);
996 struct virtio_ccw_device *vcdev = to_vc_device(dev);
997
998 kfree(vcdev->status);
999 kfree(vcdev->config_block);
1000 kfree(vcdev);
1001 }
1002
1003 static int irb_is_error(struct irb *irb)
1004 {
1005 if (scsw_cstat(&irb->scsw) != 0)
1006 return 1;
1007 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))
1008 return 1;
1009 if (scsw_cc(&irb->scsw) != 0)
1010 return 1;
1011 return 0;
1012 }
1013
1014 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev,
1015 int index)
1016 {
1017 struct virtio_ccw_vq_info *info;
1018 unsigned long flags;
1019 struct virtqueue *vq;
1020
1021 vq = NULL;
1022 spin_lock_irqsave(&vcdev->lock, flags);
1023 list_for_each_entry(info, &vcdev->virtqueues, node) {
1024 if (info->vq->index == index) {
1025 vq = info->vq;
1026 break;
1027 }
1028 }
1029 spin_unlock_irqrestore(&vcdev->lock, flags);
1030 return vq;
1031 }
1032
1033 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev,
1034 __u32 activity)
1035 {
1036 if (vcdev->curr_io & activity) {
1037 switch (activity) {
1038 case VIRTIO_CCW_DOING_READ_FEAT:
1039 case VIRTIO_CCW_DOING_WRITE_FEAT:
1040 case VIRTIO_CCW_DOING_READ_CONFIG:
1041 case VIRTIO_CCW_DOING_WRITE_CONFIG:
1042 case VIRTIO_CCW_DOING_WRITE_STATUS:
1043 case VIRTIO_CCW_DOING_READ_STATUS:
1044 case VIRTIO_CCW_DOING_SET_VQ:
1045 case VIRTIO_CCW_DOING_SET_IND:
1046 case VIRTIO_CCW_DOING_SET_CONF_IND:
1047 case VIRTIO_CCW_DOING_RESET:
1048 case VIRTIO_CCW_DOING_READ_VQ_CONF:
1049 case VIRTIO_CCW_DOING_SET_IND_ADAPTER:
1050 case VIRTIO_CCW_DOING_SET_VIRTIO_REV:
1051 vcdev->curr_io &= ~activity;
1052 wake_up(&vcdev->wait_q);
1053 break;
1054 default:
1055 /* don't know what to do... */
1056 dev_warn(&vcdev->cdev->dev,
1057 "Suspicious activity '%08x'\n", activity);
1058 WARN_ON(1);
1059 break;
1060 }
1061 }
1062 }
1063
1064 static void virtio_ccw_int_handler(struct ccw_device *cdev,
1065 unsigned long intparm,
1066 struct irb *irb)
1067 {
1068 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK;
1069 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1070 int i;
1071 struct virtqueue *vq;
1072
1073 if (!vcdev)
1074 return;
1075 if (IS_ERR(irb)) {
1076 vcdev->err = PTR_ERR(irb);
1077 virtio_ccw_check_activity(vcdev, activity);
1078 /* Don't poke around indicators, something's wrong. */
1079 return;
1080 }
1081 /* Check if it's a notification from the host. */
1082 if ((intparm == 0) &&
1083 (scsw_stctl(&irb->scsw) ==
1084 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) {
1085 /* OK */
1086 }
1087 if (irb_is_error(irb)) {
1088 /* Command reject? */
1089 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
1090 (irb->ecw[0] & SNS0_CMD_REJECT))
1091 vcdev->err = -EOPNOTSUPP;
1092 else
1093 /* Map everything else to -EIO. */
1094 vcdev->err = -EIO;
1095 }
1096 virtio_ccw_check_activity(vcdev, activity);
1097 for_each_set_bit(i, &vcdev->indicators,
1098 sizeof(vcdev->indicators) * BITS_PER_BYTE) {
1099 /* The bit clear must happen before the vring kick. */
1100 clear_bit(i, &vcdev->indicators);
1101 barrier();
1102 vq = virtio_ccw_vq_by_ind(vcdev, i);
1103 vring_interrupt(0, vq);
1104 }
1105 if (test_bit(0, &vcdev->indicators2)) {
1106 virtio_config_changed(&vcdev->vdev);
1107 clear_bit(0, &vcdev->indicators2);
1108 }
1109 }
1110
1111 /*
1112 * We usually want to autoonline all devices, but give the admin
1113 * a way to exempt devices from this.
1114 */
1115 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
1116 (8*sizeof(long)))
1117 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS];
1118
1119 static char *no_auto = "";
1120
1121 module_param(no_auto, charp, 0444);
1122 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined");
1123
1124 static int virtio_ccw_check_autoonline(struct ccw_device *cdev)
1125 {
1126 struct ccw_dev_id id;
1127
1128 ccw_device_get_id(cdev, &id);
1129 if (test_bit(id.devno, devs_no_auto[id.ssid]))
1130 return 0;
1131 return 1;
1132 }
1133
1134 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie)
1135 {
1136 struct ccw_device *cdev = data;
1137 int ret;
1138
1139 ret = ccw_device_set_online(cdev);
1140 if (ret)
1141 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret);
1142 }
1143
1144 static int virtio_ccw_probe(struct ccw_device *cdev)
1145 {
1146 cdev->handler = virtio_ccw_int_handler;
1147
1148 if (virtio_ccw_check_autoonline(cdev))
1149 async_schedule(virtio_ccw_auto_online, cdev);
1150 return 0;
1151 }
1152
1153 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev)
1154 {
1155 unsigned long flags;
1156 struct virtio_ccw_device *vcdev;
1157
1158 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1159 vcdev = dev_get_drvdata(&cdev->dev);
1160 if (!vcdev || vcdev->going_away) {
1161 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1162 return NULL;
1163 }
1164 vcdev->going_away = true;
1165 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1166 return vcdev;
1167 }
1168
1169 static void virtio_ccw_remove(struct ccw_device *cdev)
1170 {
1171 unsigned long flags;
1172 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1173
1174 if (vcdev && cdev->online) {
1175 if (vcdev->device_lost)
1176 virtio_break_device(&vcdev->vdev);
1177 unregister_virtio_device(&vcdev->vdev);
1178 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1179 dev_set_drvdata(&cdev->dev, NULL);
1180 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1181 }
1182 cdev->handler = NULL;
1183 }
1184
1185 static int virtio_ccw_offline(struct ccw_device *cdev)
1186 {
1187 unsigned long flags;
1188 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1189
1190 if (!vcdev)
1191 return 0;
1192 if (vcdev->device_lost)
1193 virtio_break_device(&vcdev->vdev);
1194 unregister_virtio_device(&vcdev->vdev);
1195 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1196 dev_set_drvdata(&cdev->dev, NULL);
1197 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1198 return 0;
1199 }
1200
1201 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev)
1202 {
1203 struct virtio_rev_info *rev;
1204 struct ccw1 *ccw;
1205 int ret;
1206
1207 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
1208 if (!ccw)
1209 return -ENOMEM;
1210 rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL);
1211 if (!rev) {
1212 kfree(ccw);
1213 return -ENOMEM;
1214 }
1215
1216 /* Set transport revision */
1217 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV;
1218 ccw->flags = 0;
1219 ccw->count = sizeof(*rev);
1220 ccw->cda = (__u32)(unsigned long)rev;
1221
1222 vcdev->revision = VIRTIO_CCW_REV_MAX;
1223 do {
1224 rev->revision = vcdev->revision;
1225 /* none of our supported revisions carry payload */
1226 rev->length = 0;
1227 ret = ccw_io_helper(vcdev, ccw,
1228 VIRTIO_CCW_DOING_SET_VIRTIO_REV);
1229 if (ret == -EOPNOTSUPP) {
1230 if (vcdev->revision == 0)
1231 /*
1232 * The host device does not support setting
1233 * the revision: let's operate it in legacy
1234 * mode.
1235 */
1236 ret = 0;
1237 else
1238 vcdev->revision--;
1239 }
1240 } while (ret == -EOPNOTSUPP);
1241
1242 kfree(ccw);
1243 kfree(rev);
1244 return ret;
1245 }
1246
1247 static int virtio_ccw_online(struct ccw_device *cdev)
1248 {
1249 int ret;
1250 struct virtio_ccw_device *vcdev;
1251 unsigned long flags;
1252
1253 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL);
1254 if (!vcdev) {
1255 dev_warn(&cdev->dev, "Could not get memory for virtio\n");
1256 ret = -ENOMEM;
1257 goto out_free;
1258 }
1259 vcdev->config_block = kzalloc(sizeof(*vcdev->config_block),
1260 GFP_DMA | GFP_KERNEL);
1261 if (!vcdev->config_block) {
1262 ret = -ENOMEM;
1263 goto out_free;
1264 }
1265 vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL);
1266 if (!vcdev->status) {
1267 ret = -ENOMEM;
1268 goto out_free;
1269 }
1270
1271 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */
1272
1273 vcdev->vdev.dev.parent = &cdev->dev;
1274 vcdev->vdev.dev.release = virtio_ccw_release_dev;
1275 vcdev->vdev.config = &virtio_ccw_config_ops;
1276 vcdev->cdev = cdev;
1277 init_waitqueue_head(&vcdev->wait_q);
1278 INIT_LIST_HEAD(&vcdev->virtqueues);
1279 spin_lock_init(&vcdev->lock);
1280 mutex_init(&vcdev->io_lock);
1281
1282 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1283 dev_set_drvdata(&cdev->dev, vcdev);
1284 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1285 vcdev->vdev.id.vendor = cdev->id.cu_type;
1286 vcdev->vdev.id.device = cdev->id.cu_model;
1287
1288 ret = virtio_ccw_set_transport_rev(vcdev);
1289 if (ret)
1290 goto out_free;
1291
1292 ret = register_virtio_device(&vcdev->vdev);
1293 if (ret) {
1294 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n",
1295 ret);
1296 goto out_put;
1297 }
1298 return 0;
1299 out_put:
1300 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1301 dev_set_drvdata(&cdev->dev, NULL);
1302 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1303 put_device(&vcdev->vdev.dev);
1304 return ret;
1305 out_free:
1306 if (vcdev) {
1307 kfree(vcdev->status);
1308 kfree(vcdev->config_block);
1309 }
1310 kfree(vcdev);
1311 return ret;
1312 }
1313
1314 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event)
1315 {
1316 int rc;
1317 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1318
1319 /*
1320 * Make sure vcdev is set
1321 * i.e. set_offline/remove callback not already running
1322 */
1323 if (!vcdev)
1324 return NOTIFY_DONE;
1325
1326 switch (event) {
1327 case CIO_GONE:
1328 vcdev->device_lost = true;
1329 rc = NOTIFY_DONE;
1330 break;
1331 case CIO_OPER:
1332 rc = NOTIFY_OK;
1333 break;
1334 default:
1335 rc = NOTIFY_DONE;
1336 break;
1337 }
1338 return rc;
1339 }
1340
1341 static struct ccw_device_id virtio_ids[] = {
1342 { CCW_DEVICE(0x3832, 0) },
1343 {},
1344 };
1345
1346 #ifdef CONFIG_PM_SLEEP
1347 static int virtio_ccw_freeze(struct ccw_device *cdev)
1348 {
1349 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1350
1351 return virtio_device_freeze(&vcdev->vdev);
1352 }
1353
1354 static int virtio_ccw_restore(struct ccw_device *cdev)
1355 {
1356 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1357 int ret;
1358
1359 ret = virtio_ccw_set_transport_rev(vcdev);
1360 if (ret)
1361 return ret;
1362
1363 return virtio_device_restore(&vcdev->vdev);
1364 }
1365 #endif
1366
1367 static struct ccw_driver virtio_ccw_driver = {
1368 .driver = {
1369 .owner = THIS_MODULE,
1370 .name = "virtio_ccw",
1371 },
1372 .ids = virtio_ids,
1373 .probe = virtio_ccw_probe,
1374 .remove = virtio_ccw_remove,
1375 .set_offline = virtio_ccw_offline,
1376 .set_online = virtio_ccw_online,
1377 .notify = virtio_ccw_cio_notify,
1378 .int_class = IRQIO_VIR,
1379 #ifdef CONFIG_PM_SLEEP
1380 .freeze = virtio_ccw_freeze,
1381 .thaw = virtio_ccw_restore,
1382 .restore = virtio_ccw_restore,
1383 #endif
1384 };
1385
1386 static int __init pure_hex(char **cp, unsigned int *val, int min_digit,
1387 int max_digit, int max_val)
1388 {
1389 int diff;
1390
1391 diff = 0;
1392 *val = 0;
1393
1394 while (diff <= max_digit) {
1395 int value = hex_to_bin(**cp);
1396
1397 if (value < 0)
1398 break;
1399 *val = *val * 16 + value;
1400 (*cp)++;
1401 diff++;
1402 }
1403
1404 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
1405 return 1;
1406
1407 return 0;
1408 }
1409
1410 static int __init parse_busid(char *str, unsigned int *cssid,
1411 unsigned int *ssid, unsigned int *devno)
1412 {
1413 char *str_work;
1414 int rc, ret;
1415
1416 rc = 1;
1417
1418 if (*str == '\0')
1419 goto out;
1420
1421 str_work = str;
1422 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
1423 if (ret || (str_work[0] != '.'))
1424 goto out;
1425 str_work++;
1426 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
1427 if (ret || (str_work[0] != '.'))
1428 goto out;
1429 str_work++;
1430 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
1431 if (ret || (str_work[0] != '\0'))
1432 goto out;
1433
1434 rc = 0;
1435 out:
1436 return rc;
1437 }
1438
1439 static void __init no_auto_parse(void)
1440 {
1441 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
1442 char *parm, *str;
1443 int rc;
1444
1445 str = no_auto;
1446 while ((parm = strsep(&str, ","))) {
1447 rc = parse_busid(strsep(&parm, "-"), &from_cssid,
1448 &from_ssid, &from);
1449 if (rc)
1450 continue;
1451 if (parm != NULL) {
1452 rc = parse_busid(parm, &to_cssid,
1453 &to_ssid, &to);
1454 if ((from_ssid > to_ssid) ||
1455 ((from_ssid == to_ssid) && (from > to)))
1456 rc = -EINVAL;
1457 } else {
1458 to_cssid = from_cssid;
1459 to_ssid = from_ssid;
1460 to = from;
1461 }
1462 if (rc)
1463 continue;
1464 while ((from_ssid < to_ssid) ||
1465 ((from_ssid == to_ssid) && (from <= to))) {
1466 set_bit(from, devs_no_auto[from_ssid]);
1467 from++;
1468 if (from > __MAX_SUBCHANNEL) {
1469 from_ssid++;
1470 from = 0;
1471 }
1472 }
1473 }
1474 }
1475
1476 static int __init virtio_ccw_init(void)
1477 {
1478 /* parse no_auto string before we do anything further */
1479 no_auto_parse();
1480 return ccw_driver_register(&virtio_ccw_driver);
1481 }
1482 device_initcall(virtio_ccw_init);
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