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dmaengine: imx-sdma: Let the core do the device node validation
[linux/fpc-iii.git] / drivers / s390 / virtio / virtio_ccw.c
blob6a30768813219fd7a28c597c27dcf8ecb6717dde
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 u64 dma_mask;
70 };
71
72 struct vq_info_block_legacy {
73 __u64 queue;
74 __u32 align;
75 __u16 index;
76 __u16 num;
77 } __packed;
78
79 struct vq_info_block {
80 __u64 desc;
81 __u32 res0;
82 __u16 index;
83 __u16 num;
84 __u64 avail;
85 __u64 used;
86 } __packed;
87
88 struct virtio_feature_desc {
89 __le32 features;
90 __u8 index;
91 } __packed;
92
93 struct virtio_thinint_area {
94 unsigned long summary_indicator;
95 unsigned long indicator;
96 u64 bit_nr;
97 u8 isc;
98 } __packed;
99
100 struct virtio_rev_info {
101 __u16 revision;
102 __u16 length;
103 __u8 data[];
104 };
105
106 /* the highest virtio-ccw revision we support */
107 #define VIRTIO_CCW_REV_MAX 1
108
109 struct virtio_ccw_vq_info {
110 struct virtqueue *vq;
111 int num;
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, bool floating)
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 if (!vcdev->airq_info)
276 return;
277 list_for_each_entry(info, &vcdev->virtqueues, node)
278 drop_airq_indicator(info->vq, vcdev->airq_info);
279 }
280
281 static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag)
282 {
283 unsigned long flags;
284 __u32 ret;
285
286 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
287 if (vcdev->err)
288 ret = 0;
289 else
290 ret = vcdev->curr_io & flag;
291 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
292 return ret;
293 }
294
295 static int ccw_io_helper(struct virtio_ccw_device *vcdev,
296 struct ccw1 *ccw, __u32 intparm)
297 {
298 int ret;
299 unsigned long flags;
300 int flag = intparm & VIRTIO_CCW_INTPARM_MASK;
301
302 mutex_lock(&vcdev->io_lock);
303 do {
304 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
305 ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0);
306 if (!ret) {
307 if (!vcdev->curr_io)
308 vcdev->err = 0;
309 vcdev->curr_io |= flag;
310 }
311 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
312 cpu_relax();
313 } while (ret == -EBUSY);
314 wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0);
315 ret = ret ? ret : vcdev->err;
316 mutex_unlock(&vcdev->io_lock);
317 return ret;
318 }
319
320 static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev,
321 struct ccw1 *ccw)
322 {
323 int ret;
324 unsigned long *indicatorp = NULL;
325 struct virtio_thinint_area *thinint_area = NULL;
326 struct airq_info *airq_info = vcdev->airq_info;
327
328 if (vcdev->is_thinint) {
329 thinint_area = kzalloc(sizeof(*thinint_area),
330 GFP_DMA | GFP_KERNEL);
331 if (!thinint_area)
332 return;
333 thinint_area->summary_indicator =
334 (unsigned long) &airq_info->summary_indicator;
335 thinint_area->isc = VIRTIO_AIRQ_ISC;
336 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
337 ccw->count = sizeof(*thinint_area);
338 ccw->cda = (__u32)(unsigned long) thinint_area;
339 } else {
340 /* payload is the address of the indicators */
341 indicatorp = kmalloc(sizeof(&vcdev->indicators),
342 GFP_DMA | GFP_KERNEL);
343 if (!indicatorp)
344 return;
345 *indicatorp = 0;
346 ccw->cmd_code = CCW_CMD_SET_IND;
347 ccw->count = sizeof(&vcdev->indicators);
348 ccw->cda = (__u32)(unsigned long) indicatorp;
349 }
350 /* Deregister indicators from host. */
351 vcdev->indicators = 0;
352 ccw->flags = 0;
353 ret = ccw_io_helper(vcdev, ccw,
354 vcdev->is_thinint ?
355 VIRTIO_CCW_DOING_SET_IND_ADAPTER :
356 VIRTIO_CCW_DOING_SET_IND);
357 if (ret && (ret != -ENODEV))
358 dev_info(&vcdev->cdev->dev,
359 "Failed to deregister indicators (%d)\n", ret);
360 else if (vcdev->is_thinint)
361 virtio_ccw_drop_indicators(vcdev);
362 kfree(indicatorp);
363 kfree(thinint_area);
364 }
365
366 static inline long __do_kvm_notify(struct subchannel_id schid,
367 unsigned long queue_index,
368 long cookie)
369 {
370 register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY;
371 register struct subchannel_id __schid asm("2") = schid;
372 register unsigned long __index asm("3") = queue_index;
373 register long __rc asm("2");
374 register long __cookie asm("4") = cookie;
375
376 asm volatile ("diag 2,4,0x500\n"
377 : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index),
378 "d"(__cookie)
379 : "memory", "cc");
380 return __rc;
381 }
382
383 static inline long do_kvm_notify(struct subchannel_id schid,
384 unsigned long queue_index,
385 long cookie)
386 {
387 diag_stat_inc(DIAG_STAT_X500);
388 return __do_kvm_notify(schid, queue_index, cookie);
389 }
390
391 static bool virtio_ccw_kvm_notify(struct virtqueue *vq)
392 {
393 struct virtio_ccw_vq_info *info = vq->priv;
394 struct virtio_ccw_device *vcdev;
395 struct subchannel_id schid;
396
397 vcdev = to_vc_device(info->vq->vdev);
398 ccw_device_get_schid(vcdev->cdev, &schid);
399 info->cookie = do_kvm_notify(schid, vq->index, info->cookie);
400 if (info->cookie < 0)
401 return false;
402 return true;
403 }
404
405 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev,
406 struct ccw1 *ccw, int index)
407 {
408 int ret;
409
410 vcdev->config_block->index = index;
411 ccw->cmd_code = CCW_CMD_READ_VQ_CONF;
412 ccw->flags = 0;
413 ccw->count = sizeof(struct vq_config_block);
414 ccw->cda = (__u32)(unsigned long)(vcdev->config_block);
415 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF);
416 if (ret)
417 return ret;
418 return vcdev->config_block->num ?: -ENOENT;
419 }
420
421 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw)
422 {
423 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev);
424 struct virtio_ccw_vq_info *info = vq->priv;
425 unsigned long flags;
426 int ret;
427 unsigned int index = vq->index;
428
429 /* Remove from our list. */
430 spin_lock_irqsave(&vcdev->lock, flags);
431 list_del(&info->node);
432 spin_unlock_irqrestore(&vcdev->lock, flags);
433
434 /* Release from host. */
435 if (vcdev->revision == 0) {
436 info->info_block->l.queue = 0;
437 info->info_block->l.align = 0;
438 info->info_block->l.index = index;
439 info->info_block->l.num = 0;
440 ccw->count = sizeof(info->info_block->l);
441 } else {
442 info->info_block->s.desc = 0;
443 info->info_block->s.index = index;
444 info->info_block->s.num = 0;
445 info->info_block->s.avail = 0;
446 info->info_block->s.used = 0;
447 ccw->count = sizeof(info->info_block->s);
448 }
449 ccw->cmd_code = CCW_CMD_SET_VQ;
450 ccw->flags = 0;
451 ccw->cda = (__u32)(unsigned long)(info->info_block);
452 ret = ccw_io_helper(vcdev, ccw,
453 VIRTIO_CCW_DOING_SET_VQ | index);
454 /*
455 * -ENODEV isn't considered an error: The device is gone anyway.
456 * This may happen on device detach.
457 */
458 if (ret && (ret != -ENODEV))
459 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n",
460 ret, index);
461
462 vring_del_virtqueue(vq);
463 kfree(info->info_block);
464 kfree(info);
465 }
466
467 static void virtio_ccw_del_vqs(struct virtio_device *vdev)
468 {
469 struct virtqueue *vq, *n;
470 struct ccw1 *ccw;
471 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
472
473 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
474 if (!ccw)
475 return;
476
477 virtio_ccw_drop_indicator(vcdev, ccw);
478
479 list_for_each_entry_safe(vq, n, &vdev->vqs, list)
480 virtio_ccw_del_vq(vq, ccw);
481
482 kfree(ccw);
483 }
484
485 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
486 int i, vq_callback_t *callback,
487 const char *name, bool ctx,
488 struct ccw1 *ccw)
489 {
490 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
491 int err;
492 struct virtqueue *vq = NULL;
493 struct virtio_ccw_vq_info *info;
494 u64 queue;
495 unsigned long flags;
496 bool may_reduce;
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 may_reduce = vcdev->revision > 0;
518 vq = vring_create_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN,
519 vdev, true, may_reduce, ctx,
520 virtio_ccw_kvm_notify, callback, name);
521
522 if (!vq) {
523 /* For now, we fail if we can't get the requested size. */
524 dev_warn(&vcdev->cdev->dev, "no vq\n");
525 err = -ENOMEM;
526 goto out_err;
527 }
528 /* it may have been reduced */
529 info->num = virtqueue_get_vring_size(vq);
530
531 /* Register it with the host. */
532 queue = virtqueue_get_desc_addr(vq);
533 if (vcdev->revision == 0) {
534 info->info_block->l.queue = 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 = 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_addr(vq);
544 info->info_block->s.used = (__u64)virtqueue_get_used_addr(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 kfree(info->info_block);
571 }
572 kfree(info);
573 return ERR_PTR(err);
574 }
575
576 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev,
577 struct virtqueue *vqs[], int nvqs,
578 struct ccw1 *ccw)
579 {
580 int ret;
581 struct virtio_thinint_area *thinint_area = NULL;
582 struct airq_info *info;
583
584 thinint_area = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL);
585 if (!thinint_area) {
586 ret = -ENOMEM;
587 goto out;
588 }
589 /* Try to get an indicator. */
590 thinint_area->indicator = get_airq_indicator(vqs, nvqs,
591 &thinint_area->bit_nr,
592 &vcdev->airq_info);
593 if (!thinint_area->indicator) {
594 ret = -ENOSPC;
595 goto out;
596 }
597 info = vcdev->airq_info;
598 thinint_area->summary_indicator =
599 (unsigned long) &info->summary_indicator;
600 thinint_area->isc = VIRTIO_AIRQ_ISC;
601 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
602 ccw->flags = CCW_FLAG_SLI;
603 ccw->count = sizeof(*thinint_area);
604 ccw->cda = (__u32)(unsigned long)thinint_area;
605 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER);
606 if (ret) {
607 if (ret == -EOPNOTSUPP) {
608 /*
609 * The host does not support adapter interrupts
610 * for virtio-ccw, stop trying.
611 */
612 virtio_ccw_use_airq = 0;
613 pr_info("Adapter interrupts unsupported on host\n");
614 } else
615 dev_warn(&vcdev->cdev->dev,
616 "enabling adapter interrupts = %d\n", ret);
617 virtio_ccw_drop_indicators(vcdev);
618 }
619 out:
620 kfree(thinint_area);
621 return ret;
622 }
623
624 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
625 struct virtqueue *vqs[],
626 vq_callback_t *callbacks[],
627 const char * const names[],
628 const bool *ctx,
629 struct irq_affinity *desc)
630 {
631 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
632 unsigned long *indicatorp = NULL;
633 int ret, i, queue_idx = 0;
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 if (!names[i]) {
642 vqs[i] = NULL;
643 continue;
644 }
645
646 vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, callbacks[i],
647 names[i], ctx ? ctx[i] : false,
648 ccw);
649 if (IS_ERR(vqs[i])) {
650 ret = PTR_ERR(vqs[i]);
651 vqs[i] = NULL;
652 goto out;
653 }
654 }
655 ret = -ENOMEM;
656 /*
657 * We need a data area under 2G to communicate. Our payload is
658 * the address of the indicators.
659 */
660 indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL);
661 if (!indicatorp)
662 goto out;
663 *indicatorp = (unsigned long) &vcdev->indicators;
664 if (vcdev->is_thinint) {
665 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw);
666 if (ret)
667 /* no error, just fall back to legacy interrupts */
668 vcdev->is_thinint = false;
669 }
670 if (!vcdev->is_thinint) {
671 /* Register queue indicators with host. */
672 vcdev->indicators = 0;
673 ccw->cmd_code = CCW_CMD_SET_IND;
674 ccw->flags = 0;
675 ccw->count = sizeof(&vcdev->indicators);
676 ccw->cda = (__u32)(unsigned long) indicatorp;
677 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND);
678 if (ret)
679 goto out;
680 }
681 /* Register indicators2 with host for config changes */
682 *indicatorp = (unsigned long) &vcdev->indicators2;
683 vcdev->indicators2 = 0;
684 ccw->cmd_code = CCW_CMD_SET_CONF_IND;
685 ccw->flags = 0;
686 ccw->count = sizeof(&vcdev->indicators2);
687 ccw->cda = (__u32)(unsigned long) indicatorp;
688 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND);
689 if (ret)
690 goto out;
691
692 kfree(indicatorp);
693 kfree(ccw);
694 return 0;
695 out:
696 kfree(indicatorp);
697 kfree(ccw);
698 virtio_ccw_del_vqs(vdev);
699 return ret;
700 }
701
702 static void virtio_ccw_reset(struct virtio_device *vdev)
703 {
704 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
705 struct ccw1 *ccw;
706
707 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
708 if (!ccw)
709 return;
710
711 /* Zero status bits. */
712 *vcdev->status = 0;
713
714 /* Send a reset ccw on device. */
715 ccw->cmd_code = CCW_CMD_VDEV_RESET;
716 ccw->flags = 0;
717 ccw->count = 0;
718 ccw->cda = 0;
719 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET);
720 kfree(ccw);
721 }
722
723 static u64 virtio_ccw_get_features(struct virtio_device *vdev)
724 {
725 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
726 struct virtio_feature_desc *features;
727 int ret;
728 u64 rc;
729 struct ccw1 *ccw;
730
731 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
732 if (!ccw)
733 return 0;
734
735 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
736 if (!features) {
737 rc = 0;
738 goto out_free;
739 }
740 /* Read the feature bits from the host. */
741 features->index = 0;
742 ccw->cmd_code = CCW_CMD_READ_FEAT;
743 ccw->flags = 0;
744 ccw->count = sizeof(*features);
745 ccw->cda = (__u32)(unsigned long)features;
746 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
747 if (ret) {
748 rc = 0;
749 goto out_free;
750 }
751
752 rc = le32_to_cpu(features->features);
753
754 if (vcdev->revision == 0)
755 goto out_free;
756
757 /* Read second half of the feature bits from the host. */
758 features->index = 1;
759 ccw->cmd_code = CCW_CMD_READ_FEAT;
760 ccw->flags = 0;
761 ccw->count = sizeof(*features);
762 ccw->cda = (__u32)(unsigned long)features;
763 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
764 if (ret == 0)
765 rc |= (u64)le32_to_cpu(features->features) << 32;
766
767 out_free:
768 kfree(features);
769 kfree(ccw);
770 return rc;
771 }
772
773 static void ccw_transport_features(struct virtio_device *vdev)
774 {
775 /*
776 * Currently nothing to do here.
777 */
778 }
779
780 static int virtio_ccw_finalize_features(struct virtio_device *vdev)
781 {
782 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
783 struct virtio_feature_desc *features;
784 struct ccw1 *ccw;
785 int ret;
786
787 if (vcdev->revision >= 1 &&
788 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
789 dev_err(&vdev->dev, "virtio: device uses revision 1 "
790 "but does not have VIRTIO_F_VERSION_1\n");
791 return -EINVAL;
792 }
793
794 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
795 if (!ccw)
796 return -ENOMEM;
797
798 features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL);
799 if (!features) {
800 ret = -ENOMEM;
801 goto out_free;
802 }
803 /* Give virtio_ring a chance to accept features. */
804 vring_transport_features(vdev);
805
806 /* Give virtio_ccw a chance to accept features. */
807 ccw_transport_features(vdev);
808
809 features->index = 0;
810 features->features = cpu_to_le32((u32)vdev->features);
811 /* Write the first half of the feature bits to the host. */
812 ccw->cmd_code = CCW_CMD_WRITE_FEAT;
813 ccw->flags = 0;
814 ccw->count = sizeof(*features);
815 ccw->cda = (__u32)(unsigned long)features;
816 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
817 if (ret)
818 goto out_free;
819
820 if (vcdev->revision == 0)
821 goto out_free;
822
823 features->index = 1;
824 features->features = cpu_to_le32(vdev->features >> 32);
825 /* Write the second half of the feature bits to the host. */
826 ccw->cmd_code = CCW_CMD_WRITE_FEAT;
827 ccw->flags = 0;
828 ccw->count = sizeof(*features);
829 ccw->cda = (__u32)(unsigned long)features;
830 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
831
832 out_free:
833 kfree(features);
834 kfree(ccw);
835
836 return ret;
837 }
838
839 static void virtio_ccw_get_config(struct virtio_device *vdev,
840 unsigned int offset, void *buf, unsigned len)
841 {
842 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
843 int ret;
844 struct ccw1 *ccw;
845 void *config_area;
846 unsigned long flags;
847
848 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
849 if (!ccw)
850 return;
851
852 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
853 if (!config_area)
854 goto out_free;
855
856 /* Read the config area from the host. */
857 ccw->cmd_code = CCW_CMD_READ_CONF;
858 ccw->flags = 0;
859 ccw->count = offset + len;
860 ccw->cda = (__u32)(unsigned long)config_area;
861 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG);
862 if (ret)
863 goto out_free;
864
865 spin_lock_irqsave(&vcdev->lock, flags);
866 memcpy(vcdev->config, config_area, offset + len);
867 if (vcdev->config_ready < offset + len)
868 vcdev->config_ready = offset + len;
869 spin_unlock_irqrestore(&vcdev->lock, flags);
870 if (buf)
871 memcpy(buf, config_area + offset, len);
872
873 out_free:
874 kfree(config_area);
875 kfree(ccw);
876 }
877
878 static void virtio_ccw_set_config(struct virtio_device *vdev,
879 unsigned int offset, const void *buf,
880 unsigned len)
881 {
882 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
883 struct ccw1 *ccw;
884 void *config_area;
885 unsigned long flags;
886
887 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
888 if (!ccw)
889 return;
890
891 config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL);
892 if (!config_area)
893 goto out_free;
894
895 /* Make sure we don't overwrite fields. */
896 if (vcdev->config_ready < offset)
897 virtio_ccw_get_config(vdev, 0, NULL, offset);
898 spin_lock_irqsave(&vcdev->lock, flags);
899 memcpy(&vcdev->config[offset], buf, len);
900 /* Write the config area to the host. */
901 memcpy(config_area, vcdev->config, sizeof(vcdev->config));
902 spin_unlock_irqrestore(&vcdev->lock, flags);
903 ccw->cmd_code = CCW_CMD_WRITE_CONF;
904 ccw->flags = 0;
905 ccw->count = offset + len;
906 ccw->cda = (__u32)(unsigned long)config_area;
907 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG);
908
909 out_free:
910 kfree(config_area);
911 kfree(ccw);
912 }
913
914 static u8 virtio_ccw_get_status(struct virtio_device *vdev)
915 {
916 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
917 u8 old_status = *vcdev->status;
918 struct ccw1 *ccw;
919
920 if (vcdev->revision < 1)
921 return *vcdev->status;
922
923 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
924 if (!ccw)
925 return old_status;
926
927 ccw->cmd_code = CCW_CMD_READ_STATUS;
928 ccw->flags = 0;
929 ccw->count = sizeof(*vcdev->status);
930 ccw->cda = (__u32)(unsigned long)vcdev->status;
931 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS);
932 /*
933 * If the channel program failed (should only happen if the device
934 * was hotunplugged, and then we clean up via the machine check
935 * handler anyway), vcdev->status was not overwritten and we just
936 * return the old status, which is fine.
937 */
938 kfree(ccw);
939
940 return *vcdev->status;
941 }
942
943 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status)
944 {
945 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
946 u8 old_status = *vcdev->status;
947 struct ccw1 *ccw;
948 int ret;
949
950 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
951 if (!ccw)
952 return;
953
954 /* Write the status to the host. */
955 *vcdev->status = status;
956 ccw->cmd_code = CCW_CMD_WRITE_STATUS;
957 ccw->flags = 0;
958 ccw->count = sizeof(status);
959 ccw->cda = (__u32)(unsigned long)vcdev->status;
960 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS);
961 /* Write failed? We assume status is unchanged. */
962 if (ret)
963 *vcdev->status = old_status;
964 kfree(ccw);
965 }
966
967 static const char *virtio_ccw_bus_name(struct virtio_device *vdev)
968 {
969 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
970
971 return dev_name(&vcdev->cdev->dev);
972 }
973
974 static const struct virtio_config_ops virtio_ccw_config_ops = {
975 .get_features = virtio_ccw_get_features,
976 .finalize_features = virtio_ccw_finalize_features,
977 .get = virtio_ccw_get_config,
978 .set = virtio_ccw_set_config,
979 .get_status = virtio_ccw_get_status,
980 .set_status = virtio_ccw_set_status,
981 .reset = virtio_ccw_reset,
982 .find_vqs = virtio_ccw_find_vqs,
983 .del_vqs = virtio_ccw_del_vqs,
984 .bus_name = virtio_ccw_bus_name,
985 };
986
987
988 /*
989 * ccw bus driver related functions
990 */
991
992 static void virtio_ccw_release_dev(struct device *_d)
993 {
994 struct virtio_device *dev = dev_to_virtio(_d);
995 struct virtio_ccw_device *vcdev = to_vc_device(dev);
996
997 kfree(vcdev->status);
998 kfree(vcdev->config_block);
999 kfree(vcdev);
1000 }
1001
1002 static int irb_is_error(struct irb *irb)
1003 {
1004 if (scsw_cstat(&irb->scsw) != 0)
1005 return 1;
1006 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))
1007 return 1;
1008 if (scsw_cc(&irb->scsw) != 0)
1009 return 1;
1010 return 0;
1011 }
1012
1013 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev,
1014 int index)
1015 {
1016 struct virtio_ccw_vq_info *info;
1017 unsigned long flags;
1018 struct virtqueue *vq;
1019
1020 vq = NULL;
1021 spin_lock_irqsave(&vcdev->lock, flags);
1022 list_for_each_entry(info, &vcdev->virtqueues, node) {
1023 if (info->vq->index == index) {
1024 vq = info->vq;
1025 break;
1026 }
1027 }
1028 spin_unlock_irqrestore(&vcdev->lock, flags);
1029 return vq;
1030 }
1031
1032 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev,
1033 __u32 activity)
1034 {
1035 if (vcdev->curr_io & activity) {
1036 switch (activity) {
1037 case VIRTIO_CCW_DOING_READ_FEAT:
1038 case VIRTIO_CCW_DOING_WRITE_FEAT:
1039 case VIRTIO_CCW_DOING_READ_CONFIG:
1040 case VIRTIO_CCW_DOING_WRITE_CONFIG:
1041 case VIRTIO_CCW_DOING_WRITE_STATUS:
1042 case VIRTIO_CCW_DOING_READ_STATUS:
1043 case VIRTIO_CCW_DOING_SET_VQ:
1044 case VIRTIO_CCW_DOING_SET_IND:
1045 case VIRTIO_CCW_DOING_SET_CONF_IND:
1046 case VIRTIO_CCW_DOING_RESET:
1047 case VIRTIO_CCW_DOING_READ_VQ_CONF:
1048 case VIRTIO_CCW_DOING_SET_IND_ADAPTER:
1049 case VIRTIO_CCW_DOING_SET_VIRTIO_REV:
1050 vcdev->curr_io &= ~activity;
1051 wake_up(&vcdev->wait_q);
1052 break;
1053 default:
1054 /* don't know what to do... */
1055 dev_warn(&vcdev->cdev->dev,
1056 "Suspicious activity '%08x'\n", activity);
1057 WARN_ON(1);
1058 break;
1059 }
1060 }
1061 }
1062
1063 static void virtio_ccw_int_handler(struct ccw_device *cdev,
1064 unsigned long intparm,
1065 struct irb *irb)
1066 {
1067 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK;
1068 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1069 int i;
1070 struct virtqueue *vq;
1071
1072 if (!vcdev)
1073 return;
1074 if (IS_ERR(irb)) {
1075 vcdev->err = PTR_ERR(irb);
1076 virtio_ccw_check_activity(vcdev, activity);
1077 /* Don't poke around indicators, something's wrong. */
1078 return;
1079 }
1080 /* Check if it's a notification from the host. */
1081 if ((intparm == 0) &&
1082 (scsw_stctl(&irb->scsw) ==
1083 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) {
1084 /* OK */
1085 }
1086 if (irb_is_error(irb)) {
1087 /* Command reject? */
1088 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
1089 (irb->ecw[0] & SNS0_CMD_REJECT))
1090 vcdev->err = -EOPNOTSUPP;
1091 else
1092 /* Map everything else to -EIO. */
1093 vcdev->err = -EIO;
1094 }
1095 virtio_ccw_check_activity(vcdev, activity);
1096 for_each_set_bit(i, &vcdev->indicators,
1097 sizeof(vcdev->indicators) * BITS_PER_BYTE) {
1098 /* The bit clear must happen before the vring kick. */
1099 clear_bit(i, &vcdev->indicators);
1100 barrier();
1101 vq = virtio_ccw_vq_by_ind(vcdev, i);
1102 vring_interrupt(0, vq);
1103 }
1104 if (test_bit(0, &vcdev->indicators2)) {
1105 virtio_config_changed(&vcdev->vdev);
1106 clear_bit(0, &vcdev->indicators2);
1107 }
1108 }
1109
1110 /*
1111 * We usually want to autoonline all devices, but give the admin
1112 * a way to exempt devices from this.
1113 */
1114 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
1115 (8*sizeof(long)))
1116 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS];
1117
1118 static char *no_auto = "";
1119
1120 module_param(no_auto, charp, 0444);
1121 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined");
1122
1123 static int virtio_ccw_check_autoonline(struct ccw_device *cdev)
1124 {
1125 struct ccw_dev_id id;
1126
1127 ccw_device_get_id(cdev, &id);
1128 if (test_bit(id.devno, devs_no_auto[id.ssid]))
1129 return 0;
1130 return 1;
1131 }
1132
1133 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie)
1134 {
1135 struct ccw_device *cdev = data;
1136 int ret;
1137
1138 ret = ccw_device_set_online(cdev);
1139 if (ret)
1140 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret);
1141 }
1142
1143 static int virtio_ccw_probe(struct ccw_device *cdev)
1144 {
1145 cdev->handler = virtio_ccw_int_handler;
1146
1147 if (virtio_ccw_check_autoonline(cdev))
1148 async_schedule(virtio_ccw_auto_online, cdev);
1149 return 0;
1150 }
1151
1152 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev)
1153 {
1154 unsigned long flags;
1155 struct virtio_ccw_device *vcdev;
1156
1157 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1158 vcdev = dev_get_drvdata(&cdev->dev);
1159 if (!vcdev || vcdev->going_away) {
1160 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1161 return NULL;
1162 }
1163 vcdev->going_away = true;
1164 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1165 return vcdev;
1166 }
1167
1168 static void virtio_ccw_remove(struct ccw_device *cdev)
1169 {
1170 unsigned long flags;
1171 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1172
1173 if (vcdev && cdev->online) {
1174 if (vcdev->device_lost)
1175 virtio_break_device(&vcdev->vdev);
1176 unregister_virtio_device(&vcdev->vdev);
1177 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1178 dev_set_drvdata(&cdev->dev, NULL);
1179 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1180 }
1181 cdev->handler = NULL;
1182 }
1183
1184 static int virtio_ccw_offline(struct ccw_device *cdev)
1185 {
1186 unsigned long flags;
1187 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1188
1189 if (!vcdev)
1190 return 0;
1191 if (vcdev->device_lost)
1192 virtio_break_device(&vcdev->vdev);
1193 unregister_virtio_device(&vcdev->vdev);
1194 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1195 dev_set_drvdata(&cdev->dev, NULL);
1196 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1197 return 0;
1198 }
1199
1200 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev)
1201 {
1202 struct virtio_rev_info *rev;
1203 struct ccw1 *ccw;
1204 int ret;
1205
1206 ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
1207 if (!ccw)
1208 return -ENOMEM;
1209 rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL);
1210 if (!rev) {
1211 kfree(ccw);
1212 return -ENOMEM;
1213 }
1214
1215 /* Set transport revision */
1216 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV;
1217 ccw->flags = 0;
1218 ccw->count = sizeof(*rev);
1219 ccw->cda = (__u32)(unsigned long)rev;
1220
1221 vcdev->revision = VIRTIO_CCW_REV_MAX;
1222 do {
1223 rev->revision = vcdev->revision;
1224 /* none of our supported revisions carry payload */
1225 rev->length = 0;
1226 ret = ccw_io_helper(vcdev, ccw,
1227 VIRTIO_CCW_DOING_SET_VIRTIO_REV);
1228 if (ret == -EOPNOTSUPP) {
1229 if (vcdev->revision == 0)
1230 /*
1231 * The host device does not support setting
1232 * the revision: let's operate it in legacy
1233 * mode.
1234 */
1235 ret = 0;
1236 else
1237 vcdev->revision--;
1238 }
1239 } while (ret == -EOPNOTSUPP);
1240
1241 kfree(ccw);
1242 kfree(rev);
1243 return ret;
1244 }
1245
1246 static int virtio_ccw_online(struct ccw_device *cdev)
1247 {
1248 int ret;
1249 struct virtio_ccw_device *vcdev;
1250 unsigned long flags;
1251
1252 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL);
1253 if (!vcdev) {
1254 dev_warn(&cdev->dev, "Could not get memory for virtio\n");
1255 ret = -ENOMEM;
1256 goto out_free;
1257 }
1258
1259 vcdev->vdev.dev.parent = &cdev->dev;
1260 cdev->dev.dma_mask = &vcdev->dma_mask;
1261 /* we are fine with common virtio infrastructure using 64 bit DMA */
1262 ret = dma_set_mask_and_coherent(&cdev->dev, DMA_BIT_MASK(64));
1263 if (ret) {
1264 dev_warn(&cdev->dev, "Failed to enable 64-bit DMA.\n");
1265 goto out_free;
1266 }
1267
1268 vcdev->config_block = kzalloc(sizeof(*vcdev->config_block),
1269 GFP_DMA | GFP_KERNEL);
1270 if (!vcdev->config_block) {
1271 ret = -ENOMEM;
1272 goto out_free;
1273 }
1274 vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL);
1275 if (!vcdev->status) {
1276 ret = -ENOMEM;
1277 goto out_free;
1278 }
1279
1280 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */
1281
1282 vcdev->vdev.dev.release = virtio_ccw_release_dev;
1283 vcdev->vdev.config = &virtio_ccw_config_ops;
1284 vcdev->cdev = cdev;
1285 init_waitqueue_head(&vcdev->wait_q);
1286 INIT_LIST_HEAD(&vcdev->virtqueues);
1287 spin_lock_init(&vcdev->lock);
1288 mutex_init(&vcdev->io_lock);
1289
1290 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1291 dev_set_drvdata(&cdev->dev, vcdev);
1292 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1293 vcdev->vdev.id.vendor = cdev->id.cu_type;
1294 vcdev->vdev.id.device = cdev->id.cu_model;
1295
1296 ret = virtio_ccw_set_transport_rev(vcdev);
1297 if (ret)
1298 goto out_free;
1299
1300 ret = register_virtio_device(&vcdev->vdev);
1301 if (ret) {
1302 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n",
1303 ret);
1304 goto out_put;
1305 }
1306 return 0;
1307 out_put:
1308 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1309 dev_set_drvdata(&cdev->dev, NULL);
1310 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1311 put_device(&vcdev->vdev.dev);
1312 return ret;
1313 out_free:
1314 if (vcdev) {
1315 kfree(vcdev->status);
1316 kfree(vcdev->config_block);
1317 }
1318 kfree(vcdev);
1319 return ret;
1320 }
1321
1322 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event)
1323 {
1324 int rc;
1325 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1326
1327 /*
1328 * Make sure vcdev is set
1329 * i.e. set_offline/remove callback not already running
1330 */
1331 if (!vcdev)
1332 return NOTIFY_DONE;
1333
1334 switch (event) {
1335 case CIO_GONE:
1336 vcdev->device_lost = true;
1337 rc = NOTIFY_DONE;
1338 break;
1339 case CIO_OPER:
1340 rc = NOTIFY_OK;
1341 break;
1342 default:
1343 rc = NOTIFY_DONE;
1344 break;
1345 }
1346 return rc;
1347 }
1348
1349 static struct ccw_device_id virtio_ids[] = {
1350 { CCW_DEVICE(0x3832, 0) },
1351 {},
1352 };
1353
1354 #ifdef CONFIG_PM_SLEEP
1355 static int virtio_ccw_freeze(struct ccw_device *cdev)
1356 {
1357 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1358
1359 return virtio_device_freeze(&vcdev->vdev);
1360 }
1361
1362 static int virtio_ccw_restore(struct ccw_device *cdev)
1363 {
1364 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1365 int ret;
1366
1367 ret = virtio_ccw_set_transport_rev(vcdev);
1368 if (ret)
1369 return ret;
1370
1371 return virtio_device_restore(&vcdev->vdev);
1372 }
1373 #endif
1374
1375 static struct ccw_driver virtio_ccw_driver = {
1376 .driver = {
1377 .owner = THIS_MODULE,
1378 .name = "virtio_ccw",
1379 },
1380 .ids = virtio_ids,
1381 .probe = virtio_ccw_probe,
1382 .remove = virtio_ccw_remove,
1383 .set_offline = virtio_ccw_offline,
1384 .set_online = virtio_ccw_online,
1385 .notify = virtio_ccw_cio_notify,
1386 .int_class = IRQIO_VIR,
1387 #ifdef CONFIG_PM_SLEEP
1388 .freeze = virtio_ccw_freeze,
1389 .thaw = virtio_ccw_restore,
1390 .restore = virtio_ccw_restore,
1391 #endif
1392 };
1393
1394 static int __init pure_hex(char **cp, unsigned int *val, int min_digit,
1395 int max_digit, int max_val)
1396 {
1397 int diff;
1398
1399 diff = 0;
1400 *val = 0;
1401
1402 while (diff <= max_digit) {
1403 int value = hex_to_bin(**cp);
1404
1405 if (value < 0)
1406 break;
1407 *val = *val * 16 + value;
1408 (*cp)++;
1409 diff++;
1410 }
1411
1412 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
1413 return 1;
1414
1415 return 0;
1416 }
1417
1418 static int __init parse_busid(char *str, unsigned int *cssid,
1419 unsigned int *ssid, unsigned int *devno)
1420 {
1421 char *str_work;
1422 int rc, ret;
1423
1424 rc = 1;
1425
1426 if (*str == '\0')
1427 goto out;
1428
1429 str_work = str;
1430 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
1431 if (ret || (str_work[0] != '.'))
1432 goto out;
1433 str_work++;
1434 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
1435 if (ret || (str_work[0] != '.'))
1436 goto out;
1437 str_work++;
1438 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
1439 if (ret || (str_work[0] != '\0'))
1440 goto out;
1441
1442 rc = 0;
1443 out:
1444 return rc;
1445 }
1446
1447 static void __init no_auto_parse(void)
1448 {
1449 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
1450 char *parm, *str;
1451 int rc;
1452
1453 str = no_auto;
1454 while ((parm = strsep(&str, ","))) {
1455 rc = parse_busid(strsep(&parm, "-"), &from_cssid,
1456 &from_ssid, &from);
1457 if (rc)
1458 continue;
1459 if (parm != NULL) {
1460 rc = parse_busid(parm, &to_cssid,
1461 &to_ssid, &to);
1462 if ((from_ssid > to_ssid) ||
1463 ((from_ssid == to_ssid) && (from > to)))
1464 rc = -EINVAL;
1465 } else {
1466 to_cssid = from_cssid;
1467 to_ssid = from_ssid;
1468 to = from;
1469 }
1470 if (rc)
1471 continue;
1472 while ((from_ssid < to_ssid) ||
1473 ((from_ssid == to_ssid) && (from <= to))) {
1474 set_bit(from, devs_no_auto[from_ssid]);
1475 from++;
1476 if (from > __MAX_SUBCHANNEL) {
1477 from_ssid++;
1478 from = 0;
1479 }
1480 }
1481 }
1482 }
1483
1484 static int __init virtio_ccw_init(void)
1485 {
1486 /* parse no_auto string before we do anything further */
1487 no_auto_parse();
1488 return ccw_driver_register(&virtio_ccw_driver);
1489 }
1490 device_initcall(virtio_ccw_init);
Linux with added FPC-III support