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