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Merge tag 'trace-printf-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...
[drm/drm-misc.git] / drivers / s390 / virtio / virtio_ccw.c
blob21fa7ac849e5c372e99f1d98092c8538c061527b
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 #include <asm/tpi.h>
37
38 /*
39 * virtio related functions
40 */
41
42 struct vq_config_block {
43 __u16 index;
44 __u16 num;
45 } __packed;
46
47 #define VIRTIO_CCW_CONFIG_SIZE 0x100
48 /* same as PCI config space size, should be enough for all drivers */
49
50 struct vcdev_dma_area {
51 unsigned long indicators;
52 unsigned long indicators2;
53 struct vq_config_block config_block;
54 __u8 status;
55 };
56
57 struct virtio_ccw_device {
58 struct virtio_device vdev;
59 __u8 config[VIRTIO_CCW_CONFIG_SIZE];
60 struct ccw_device *cdev;
61 /* we make cdev->dev.dma_parms point to this */
62 struct device_dma_parameters dma_parms;
63 __u32 curr_io;
64 int err;
65 unsigned int revision; /* Transport revision */
66 wait_queue_head_t wait_q;
67 spinlock_t lock;
68 rwlock_t irq_lock;
69 struct mutex io_lock; /* Serializes I/O requests */
70 struct list_head virtqueues;
71 bool is_thinint;
72 bool going_away;
73 bool device_lost;
74 unsigned int config_ready;
75 void *airq_info;
76 struct vcdev_dma_area *dma_area;
77 dma32_t dma_area_addr;
78 };
79
80 static inline unsigned long *indicators(struct virtio_ccw_device *vcdev)
81 {
82 return &vcdev->dma_area->indicators;
83 }
84
85 static inline unsigned long *indicators2(struct virtio_ccw_device *vcdev)
86 {
87 return &vcdev->dma_area->indicators2;
88 }
89
90 /* Spec stipulates a 64 bit address */
91 static inline dma64_t indicators_dma(struct virtio_ccw_device *vcdev)
92 {
93 u64 dma_area_addr = dma32_to_u32(vcdev->dma_area_addr);
94
95 return dma64_add(u64_to_dma64(dma_area_addr),
96 offsetof(struct vcdev_dma_area, indicators));
97 }
98
99 /* Spec stipulates a 64 bit address */
100 static inline dma64_t indicators2_dma(struct virtio_ccw_device *vcdev)
101 {
102 u64 dma_area_addr = dma32_to_u32(vcdev->dma_area_addr);
103
104 return dma64_add(u64_to_dma64(dma_area_addr),
105 offsetof(struct vcdev_dma_area, indicators2));
106 }
107
108 static inline dma32_t config_block_dma(struct virtio_ccw_device *vcdev)
109 {
110 return dma32_add(vcdev->dma_area_addr,
111 offsetof(struct vcdev_dma_area, config_block));
112 }
113
114 static inline dma32_t status_dma(struct virtio_ccw_device *vcdev)
115 {
116 return dma32_add(vcdev->dma_area_addr,
117 offsetof(struct vcdev_dma_area, status));
118 }
119
120 struct vq_info_block_legacy {
121 dma64_t queue;
122 __u32 align;
123 __u16 index;
124 __u16 num;
125 } __packed;
126
127 struct vq_info_block {
128 dma64_t desc;
129 __u32 res0;
130 __u16 index;
131 __u16 num;
132 dma64_t avail;
133 dma64_t used;
134 } __packed;
135
136 struct virtio_feature_desc {
137 __le32 features;
138 __u8 index;
139 } __packed;
140
141 struct virtio_thinint_area {
142 dma64_t summary_indicator;
143 dma64_t indicator;
144 u64 bit_nr;
145 u8 isc;
146 } __packed;
147
148 struct virtio_rev_info {
149 __u16 revision;
150 __u16 length;
151 __u8 data[];
152 };
153
154 /* the highest virtio-ccw revision we support */
155 #define VIRTIO_CCW_REV_MAX 2
156
157 struct virtio_ccw_vq_info {
158 struct virtqueue *vq;
159 dma32_t info_block_addr;
160 int num;
161 union {
162 struct vq_info_block s;
163 struct vq_info_block_legacy l;
164 } *info_block;
165 int bit_nr;
166 struct list_head node;
167 long cookie;
168 };
169
170 #define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */
171
172 #define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8)
173 #define MAX_AIRQ_AREAS 20
174
175 static int virtio_ccw_use_airq = 1;
176
177 struct airq_info {
178 rwlock_t lock;
179 u8 summary_indicator_idx;
180 struct airq_struct airq;
181 struct airq_iv *aiv;
182 };
183 static struct airq_info *airq_areas[MAX_AIRQ_AREAS];
184 static DEFINE_MUTEX(airq_areas_lock);
185
186 static u8 *summary_indicators;
187
188 static inline u8 *get_summary_indicator(struct airq_info *info)
189 {
190 return summary_indicators + info->summary_indicator_idx;
191 }
192
193 static inline dma64_t get_summary_indicator_dma(struct airq_info *info)
194 {
195 return virt_to_dma64(get_summary_indicator(info));
196 }
197
198 #define CCW_CMD_SET_VQ 0x13
199 #define CCW_CMD_VDEV_RESET 0x33
200 #define CCW_CMD_SET_IND 0x43
201 #define CCW_CMD_SET_CONF_IND 0x53
202 #define CCW_CMD_READ_FEAT 0x12
203 #define CCW_CMD_WRITE_FEAT 0x11
204 #define CCW_CMD_READ_CONF 0x22
205 #define CCW_CMD_WRITE_CONF 0x21
206 #define CCW_CMD_WRITE_STATUS 0x31
207 #define CCW_CMD_READ_VQ_CONF 0x32
208 #define CCW_CMD_READ_STATUS 0x72
209 #define CCW_CMD_SET_IND_ADAPTER 0x73
210 #define CCW_CMD_SET_VIRTIO_REV 0x83
211
212 #define VIRTIO_CCW_DOING_SET_VQ 0x00010000
213 #define VIRTIO_CCW_DOING_RESET 0x00040000
214 #define VIRTIO_CCW_DOING_READ_FEAT 0x00080000
215 #define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000
216 #define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000
217 #define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000
218 #define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000
219 #define VIRTIO_CCW_DOING_SET_IND 0x01000000
220 #define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000
221 #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000
222 #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000
223 #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000
224 #define VIRTIO_CCW_DOING_READ_STATUS 0x20000000
225 #define VIRTIO_CCW_INTPARM_MASK 0xffff0000
226
227 static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev)
228 {
229 return container_of(vdev, struct virtio_ccw_device, vdev);
230 }
231
232 static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info)
233 {
234 unsigned long i, flags;
235
236 write_lock_irqsave(&info->lock, flags);
237 for (i = 0; i < airq_iv_end(info->aiv); i++) {
238 if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) {
239 airq_iv_free_bit(info->aiv, i);
240 airq_iv_set_ptr(info->aiv, i, 0);
241 break;
242 }
243 }
244 write_unlock_irqrestore(&info->lock, flags);
245 }
246
247 static void virtio_airq_handler(struct airq_struct *airq,
248 struct tpi_info *tpi_info)
249 {
250 struct airq_info *info = container_of(airq, struct airq_info, airq);
251 unsigned long ai;
252
253 inc_irq_stat(IRQIO_VAI);
254 read_lock(&info->lock);
255 /* Walk through indicators field, summary indicator active. */
256 for (ai = 0;;) {
257 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv));
258 if (ai == -1UL)
259 break;
260 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai));
261 }
262 *(get_summary_indicator(info)) = 0;
263 smp_wmb();
264 /* Walk through indicators field, summary indicator not active. */
265 for (ai = 0;;) {
266 ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv));
267 if (ai == -1UL)
268 break;
269 vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai));
270 }
271 read_unlock(&info->lock);
272 }
273
274 static struct airq_info *new_airq_info(int index)
275 {
276 struct airq_info *info;
277 int rc;
278
279 info = kzalloc(sizeof(*info), GFP_KERNEL);
280 if (!info)
281 return NULL;
282 rwlock_init(&info->lock);
283 info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR
284 | AIRQ_IV_CACHELINE, NULL);
285 if (!info->aiv) {
286 kfree(info);
287 return NULL;
288 }
289 info->airq.handler = virtio_airq_handler;
290 info->summary_indicator_idx = index;
291 info->airq.lsi_ptr = get_summary_indicator(info);
292 info->airq.isc = VIRTIO_AIRQ_ISC;
293 rc = register_adapter_interrupt(&info->airq);
294 if (rc) {
295 airq_iv_release(info->aiv);
296 kfree(info);
297 return NULL;
298 }
299 return info;
300 }
301
302 static unsigned long *get_airq_indicator(struct virtqueue *vqs[], int nvqs,
303 u64 *first, void **airq_info)
304 {
305 int i, j;
306 struct airq_info *info;
307 unsigned long *indicator_addr = NULL;
308 unsigned long bit, flags;
309
310 for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) {
311 mutex_lock(&airq_areas_lock);
312 if (!airq_areas[i])
313 airq_areas[i] = new_airq_info(i);
314 info = airq_areas[i];
315 mutex_unlock(&airq_areas_lock);
316 if (!info)
317 return NULL;
318 write_lock_irqsave(&info->lock, flags);
319 bit = airq_iv_alloc(info->aiv, nvqs);
320 if (bit == -1UL) {
321 /* Not enough vacancies. */
322 write_unlock_irqrestore(&info->lock, flags);
323 continue;
324 }
325 *first = bit;
326 *airq_info = info;
327 indicator_addr = info->aiv->vector;
328 for (j = 0; j < nvqs; j++) {
329 airq_iv_set_ptr(info->aiv, bit + j,
330 (unsigned long)vqs[j]);
331 }
332 write_unlock_irqrestore(&info->lock, flags);
333 }
334 return indicator_addr;
335 }
336
337 static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev)
338 {
339 struct virtio_ccw_vq_info *info;
340
341 if (!vcdev->airq_info)
342 return;
343 list_for_each_entry(info, &vcdev->virtqueues, node)
344 drop_airq_indicator(info->vq, vcdev->airq_info);
345 }
346
347 static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag)
348 {
349 unsigned long flags;
350 __u32 ret;
351
352 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
353 if (vcdev->err)
354 ret = 0;
355 else
356 ret = vcdev->curr_io & flag;
357 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
358 return ret;
359 }
360
361 static int ccw_io_helper(struct virtio_ccw_device *vcdev,
362 struct ccw1 *ccw, __u32 intparm)
363 {
364 int ret;
365 unsigned long flags;
366 int flag = intparm & VIRTIO_CCW_INTPARM_MASK;
367
368 mutex_lock(&vcdev->io_lock);
369 do {
370 spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags);
371 ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0);
372 if (!ret) {
373 if (!vcdev->curr_io)
374 vcdev->err = 0;
375 vcdev->curr_io |= flag;
376 }
377 spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags);
378 cpu_relax();
379 } while (ret == -EBUSY);
380 wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0);
381 ret = ret ? ret : vcdev->err;
382 mutex_unlock(&vcdev->io_lock);
383 return ret;
384 }
385
386 static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev,
387 struct ccw1 *ccw)
388 {
389 int ret;
390 struct virtio_thinint_area *thinint_area = NULL;
391 struct airq_info *airq_info = vcdev->airq_info;
392 dma64_t *indicatorp = NULL;
393
394 if (vcdev->is_thinint) {
395 thinint_area = ccw_device_dma_zalloc(vcdev->cdev,
396 sizeof(*thinint_area),
397 &ccw->cda);
398 if (!thinint_area)
399 return;
400 thinint_area->summary_indicator =
401 get_summary_indicator_dma(airq_info);
402 thinint_area->isc = VIRTIO_AIRQ_ISC;
403 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
404 ccw->count = sizeof(*thinint_area);
405 } else {
406 /* payload is the address of the indicators */
407 indicatorp = ccw_device_dma_zalloc(vcdev->cdev,
408 sizeof(*indicatorp),
409 &ccw->cda);
410 if (!indicatorp)
411 return;
412 *indicatorp = 0;
413 ccw->cmd_code = CCW_CMD_SET_IND;
414 ccw->count = sizeof(*indicatorp);
415 }
416 /* Deregister indicators from host. */
417 *indicators(vcdev) = 0;
418 ccw->flags = 0;
419 ret = ccw_io_helper(vcdev, ccw,
420 vcdev->is_thinint ?
421 VIRTIO_CCW_DOING_SET_IND_ADAPTER :
422 VIRTIO_CCW_DOING_SET_IND);
423 if (ret && (ret != -ENODEV))
424 dev_info(&vcdev->cdev->dev,
425 "Failed to deregister indicators (%d)\n", ret);
426 else if (vcdev->is_thinint)
427 virtio_ccw_drop_indicators(vcdev);
428 ccw_device_dma_free(vcdev->cdev, indicatorp, sizeof(*indicatorp));
429 ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area));
430 }
431
432 static inline bool virtio_ccw_do_kvm_notify(struct virtqueue *vq, u32 data)
433 {
434 struct virtio_ccw_vq_info *info = vq->priv;
435 struct virtio_ccw_device *vcdev;
436 struct subchannel_id schid;
437
438 vcdev = to_vc_device(info->vq->vdev);
439 ccw_device_get_schid(vcdev->cdev, &schid);
440 BUILD_BUG_ON(sizeof(struct subchannel_id) != sizeof(unsigned int));
441 info->cookie = kvm_hypercall3(KVM_S390_VIRTIO_CCW_NOTIFY,
442 *((unsigned int *)&schid),
443 data, info->cookie);
444 if (info->cookie < 0)
445 return false;
446 return true;
447 }
448
449 static bool virtio_ccw_kvm_notify(struct virtqueue *vq)
450 {
451 return virtio_ccw_do_kvm_notify(vq, vq->index);
452 }
453
454 static bool virtio_ccw_kvm_notify_with_data(struct virtqueue *vq)
455 {
456 return virtio_ccw_do_kvm_notify(vq, vring_notification_data(vq));
457 }
458
459 static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev,
460 struct ccw1 *ccw, int index)
461 {
462 int ret;
463
464 vcdev->dma_area->config_block.index = index;
465 ccw->cmd_code = CCW_CMD_READ_VQ_CONF;
466 ccw->flags = 0;
467 ccw->count = sizeof(struct vq_config_block);
468 ccw->cda = config_block_dma(vcdev);
469 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF);
470 if (ret)
471 return ret;
472 return vcdev->dma_area->config_block.num ?: -ENOENT;
473 }
474
475 static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw)
476 {
477 struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev);
478 struct virtio_ccw_vq_info *info = vq->priv;
479 unsigned long flags;
480 int ret;
481 unsigned int index = vq->index;
482
483 /* Remove from our list. */
484 spin_lock_irqsave(&vcdev->lock, flags);
485 list_del(&info->node);
486 spin_unlock_irqrestore(&vcdev->lock, flags);
487
488 /* Release from host. */
489 if (vcdev->revision == 0) {
490 info->info_block->l.queue = 0;
491 info->info_block->l.align = 0;
492 info->info_block->l.index = index;
493 info->info_block->l.num = 0;
494 ccw->count = sizeof(info->info_block->l);
495 } else {
496 info->info_block->s.desc = 0;
497 info->info_block->s.index = index;
498 info->info_block->s.num = 0;
499 info->info_block->s.avail = 0;
500 info->info_block->s.used = 0;
501 ccw->count = sizeof(info->info_block->s);
502 }
503 ccw->cmd_code = CCW_CMD_SET_VQ;
504 ccw->flags = 0;
505 ccw->cda = info->info_block_addr;
506 ret = ccw_io_helper(vcdev, ccw,
507 VIRTIO_CCW_DOING_SET_VQ | index);
508 /*
509 * -ENODEV isn't considered an error: The device is gone anyway.
510 * This may happen on device detach.
511 */
512 if (ret && (ret != -ENODEV))
513 dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n",
514 ret, index);
515
516 vring_del_virtqueue(vq);
517 ccw_device_dma_free(vcdev->cdev, info->info_block,
518 sizeof(*info->info_block));
519 kfree(info);
520 }
521
522 static void virtio_ccw_del_vqs(struct virtio_device *vdev)
523 {
524 struct virtqueue *vq, *n;
525 struct ccw1 *ccw;
526 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
527
528 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL);
529 if (!ccw)
530 return;
531
532 virtio_ccw_drop_indicator(vcdev, ccw);
533
534 list_for_each_entry_safe(vq, n, &vdev->vqs, list)
535 virtio_ccw_del_vq(vq, ccw);
536
537 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
538 }
539
540 static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
541 int i, vq_callback_t *callback,
542 const char *name, bool ctx,
543 struct ccw1 *ccw)
544 {
545 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
546 bool (*notify)(struct virtqueue *vq);
547 int err;
548 struct virtqueue *vq = NULL;
549 struct virtio_ccw_vq_info *info;
550 u64 queue;
551 unsigned long flags;
552 bool may_reduce;
553
554 if (__virtio_test_bit(vdev, VIRTIO_F_NOTIFICATION_DATA))
555 notify = virtio_ccw_kvm_notify_with_data;
556 else
557 notify = virtio_ccw_kvm_notify;
558
559 /* Allocate queue. */
560 info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL);
561 if (!info) {
562 dev_warn(&vcdev->cdev->dev, "no info\n");
563 err = -ENOMEM;
564 goto out_err;
565 }
566 info->info_block = ccw_device_dma_zalloc(vcdev->cdev,
567 sizeof(*info->info_block),
568 &info->info_block_addr);
569 if (!info->info_block) {
570 dev_warn(&vcdev->cdev->dev, "no info block\n");
571 err = -ENOMEM;
572 goto out_err;
573 }
574 info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i);
575 if (info->num < 0) {
576 err = info->num;
577 goto out_err;
578 }
579 may_reduce = vcdev->revision > 0;
580 vq = vring_create_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN,
581 vdev, true, may_reduce, ctx,
582 notify, callback, name);
583
584 if (!vq) {
585 /* For now, we fail if we can't get the requested size. */
586 dev_warn(&vcdev->cdev->dev, "no vq\n");
587 err = -ENOMEM;
588 goto out_err;
589 }
590
591 vq->num_max = info->num;
592
593 /* it may have been reduced */
594 info->num = virtqueue_get_vring_size(vq);
595
596 /* Register it with the host. */
597 queue = virtqueue_get_desc_addr(vq);
598 if (vcdev->revision == 0) {
599 info->info_block->l.queue = u64_to_dma64(queue);
600 info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN;
601 info->info_block->l.index = i;
602 info->info_block->l.num = info->num;
603 ccw->count = sizeof(info->info_block->l);
604 } else {
605 info->info_block->s.desc = u64_to_dma64(queue);
606 info->info_block->s.index = i;
607 info->info_block->s.num = info->num;
608 info->info_block->s.avail = u64_to_dma64(virtqueue_get_avail_addr(vq));
609 info->info_block->s.used = u64_to_dma64(virtqueue_get_used_addr(vq));
610 ccw->count = sizeof(info->info_block->s);
611 }
612 ccw->cmd_code = CCW_CMD_SET_VQ;
613 ccw->flags = 0;
614 ccw->cda = info->info_block_addr;
615 err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i);
616 if (err) {
617 dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n");
618 goto out_err;
619 }
620
621 info->vq = vq;
622 vq->priv = info;
623
624 /* Save it to our list. */
625 spin_lock_irqsave(&vcdev->lock, flags);
626 list_add(&info->node, &vcdev->virtqueues);
627 spin_unlock_irqrestore(&vcdev->lock, flags);
628
629 return vq;
630
631 out_err:
632 if (vq)
633 vring_del_virtqueue(vq);
634 if (info) {
635 ccw_device_dma_free(vcdev->cdev, info->info_block,
636 sizeof(*info->info_block));
637 }
638 kfree(info);
639 return ERR_PTR(err);
640 }
641
642 static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev,
643 struct virtqueue *vqs[], int nvqs,
644 struct ccw1 *ccw)
645 {
646 int ret;
647 struct virtio_thinint_area *thinint_area = NULL;
648 unsigned long *indicator_addr;
649 struct airq_info *info;
650
651 thinint_area = ccw_device_dma_zalloc(vcdev->cdev,
652 sizeof(*thinint_area),
653 &ccw->cda);
654 if (!thinint_area) {
655 ret = -ENOMEM;
656 goto out;
657 }
658 /* Try to get an indicator. */
659 indicator_addr = get_airq_indicator(vqs, nvqs,
660 &thinint_area->bit_nr,
661 &vcdev->airq_info);
662 if (!indicator_addr) {
663 ret = -ENOSPC;
664 goto out;
665 }
666 thinint_area->indicator = virt_to_dma64(indicator_addr);
667 info = vcdev->airq_info;
668 thinint_area->summary_indicator = get_summary_indicator_dma(info);
669 thinint_area->isc = VIRTIO_AIRQ_ISC;
670 ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
671 ccw->flags = CCW_FLAG_SLI;
672 ccw->count = sizeof(*thinint_area);
673 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER);
674 if (ret) {
675 if (ret == -EOPNOTSUPP) {
676 /*
677 * The host does not support adapter interrupts
678 * for virtio-ccw, stop trying.
679 */
680 virtio_ccw_use_airq = 0;
681 pr_info("Adapter interrupts unsupported on host\n");
682 } else
683 dev_warn(&vcdev->cdev->dev,
684 "enabling adapter interrupts = %d\n", ret);
685 virtio_ccw_drop_indicators(vcdev);
686 }
687 out:
688 ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area));
689 return ret;
690 }
691
692 static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
693 struct virtqueue *vqs[],
694 struct virtqueue_info vqs_info[],
695 struct irq_affinity *desc)
696 {
697 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
698 dma64_t *indicatorp = NULL;
699 int ret, i, queue_idx = 0;
700 struct ccw1 *ccw;
701 dma32_t indicatorp_dma = 0;
702
703 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL);
704 if (!ccw)
705 return -ENOMEM;
706
707 for (i = 0; i < nvqs; ++i) {
708 struct virtqueue_info *vqi = &vqs_info[i];
709
710 if (!vqi->name) {
711 vqs[i] = NULL;
712 continue;
713 }
714
715 vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, vqi->callback,
716 vqi->name, vqi->ctx, ccw);
717 if (IS_ERR(vqs[i])) {
718 ret = PTR_ERR(vqs[i]);
719 vqs[i] = NULL;
720 goto out;
721 }
722 }
723 ret = -ENOMEM;
724 /*
725 * We need a data area under 2G to communicate. Our payload is
726 * the address of the indicators.
727 */
728 indicatorp = ccw_device_dma_zalloc(vcdev->cdev,
729 sizeof(*indicatorp),
730 &indicatorp_dma);
731 if (!indicatorp)
732 goto out;
733 *indicatorp = indicators_dma(vcdev);
734 if (vcdev->is_thinint) {
735 ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw);
736 if (ret)
737 /* no error, just fall back to legacy interrupts */
738 vcdev->is_thinint = false;
739 }
740 ccw->cda = indicatorp_dma;
741 if (!vcdev->is_thinint) {
742 /* Register queue indicators with host. */
743 *indicators(vcdev) = 0;
744 ccw->cmd_code = CCW_CMD_SET_IND;
745 ccw->flags = 0;
746 ccw->count = sizeof(*indicatorp);
747 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND);
748 if (ret)
749 goto out;
750 }
751 /* Register indicators2 with host for config changes */
752 *indicatorp = indicators2_dma(vcdev);
753 *indicators2(vcdev) = 0;
754 ccw->cmd_code = CCW_CMD_SET_CONF_IND;
755 ccw->flags = 0;
756 ccw->count = sizeof(*indicatorp);
757 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND);
758 if (ret)
759 goto out;
760
761 if (indicatorp)
762 ccw_device_dma_free(vcdev->cdev, indicatorp,
763 sizeof(*indicatorp));
764 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
765 return 0;
766 out:
767 if (indicatorp)
768 ccw_device_dma_free(vcdev->cdev, indicatorp,
769 sizeof(*indicatorp));
770 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
771 virtio_ccw_del_vqs(vdev);
772 return ret;
773 }
774
775 static void virtio_ccw_reset(struct virtio_device *vdev)
776 {
777 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
778 struct ccw1 *ccw;
779
780 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL);
781 if (!ccw)
782 return;
783
784 /* Zero status bits. */
785 vcdev->dma_area->status = 0;
786
787 /* Send a reset ccw on device. */
788 ccw->cmd_code = CCW_CMD_VDEV_RESET;
789 ccw->flags = 0;
790 ccw->count = 0;
791 ccw->cda = 0;
792 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET);
793 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
794 }
795
796 static u64 virtio_ccw_get_features(struct virtio_device *vdev)
797 {
798 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
799 struct virtio_feature_desc *features;
800 int ret;
801 u64 rc;
802 struct ccw1 *ccw;
803
804 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL);
805 if (!ccw)
806 return 0;
807
808 features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features),
809 &ccw->cda);
810 if (!features) {
811 rc = 0;
812 goto out_free;
813 }
814 /* Read the feature bits from the host. */
815 features->index = 0;
816 ccw->cmd_code = CCW_CMD_READ_FEAT;
817 ccw->flags = 0;
818 ccw->count = sizeof(*features);
819 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
820 if (ret) {
821 rc = 0;
822 goto out_free;
823 }
824
825 rc = le32_to_cpu(features->features);
826
827 if (vcdev->revision == 0)
828 goto out_free;
829
830 /* Read second half of the feature bits from the host. */
831 features->index = 1;
832 ccw->cmd_code = CCW_CMD_READ_FEAT;
833 ccw->flags = 0;
834 ccw->count = sizeof(*features);
835 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
836 if (ret == 0)
837 rc |= (u64)le32_to_cpu(features->features) << 32;
838
839 out_free:
840 ccw_device_dma_free(vcdev->cdev, features, sizeof(*features));
841 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
842 return rc;
843 }
844
845 static void ccw_transport_features(struct virtio_device *vdev)
846 {
847 /*
848 * Currently nothing to do here.
849 */
850 }
851
852 static int virtio_ccw_finalize_features(struct virtio_device *vdev)
853 {
854 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
855 struct virtio_feature_desc *features;
856 struct ccw1 *ccw;
857 int ret;
858
859 if (vcdev->revision >= 1 &&
860 !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
861 dev_err(&vdev->dev, "virtio: device uses revision 1 "
862 "but does not have VIRTIO_F_VERSION_1\n");
863 return -EINVAL;
864 }
865
866 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL);
867 if (!ccw)
868 return -ENOMEM;
869
870 features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features),
871 &ccw->cda);
872 if (!features) {
873 ret = -ENOMEM;
874 goto out_free;
875 }
876 /* Give virtio_ring a chance to accept features. */
877 vring_transport_features(vdev);
878
879 /* Give virtio_ccw a chance to accept features. */
880 ccw_transport_features(vdev);
881
882 features->index = 0;
883 features->features = cpu_to_le32((u32)vdev->features);
884 /* Write the first half of the feature bits to the host. */
885 ccw->cmd_code = CCW_CMD_WRITE_FEAT;
886 ccw->flags = 0;
887 ccw->count = sizeof(*features);
888 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
889 if (ret)
890 goto out_free;
891
892 if (vcdev->revision == 0)
893 goto out_free;
894
895 features->index = 1;
896 features->features = cpu_to_le32(vdev->features >> 32);
897 /* Write the second half of the feature bits to the host. */
898 ccw->cmd_code = CCW_CMD_WRITE_FEAT;
899 ccw->flags = 0;
900 ccw->count = sizeof(*features);
901 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
902
903 out_free:
904 ccw_device_dma_free(vcdev->cdev, features, sizeof(*features));
905 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
906
907 return ret;
908 }
909
910 static void virtio_ccw_get_config(struct virtio_device *vdev,
911 unsigned int offset, void *buf, unsigned len)
912 {
913 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
914 int ret;
915 struct ccw1 *ccw;
916 void *config_area;
917 unsigned long flags;
918
919 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL);
920 if (!ccw)
921 return;
922
923 config_area = ccw_device_dma_zalloc(vcdev->cdev,
924 VIRTIO_CCW_CONFIG_SIZE,
925 &ccw->cda);
926 if (!config_area)
927 goto out_free;
928
929 /* Read the config area from the host. */
930 ccw->cmd_code = CCW_CMD_READ_CONF;
931 ccw->flags = 0;
932 ccw->count = offset + len;
933 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG);
934 if (ret)
935 goto out_free;
936
937 spin_lock_irqsave(&vcdev->lock, flags);
938 memcpy(vcdev->config, config_area, offset + len);
939 if (vcdev->config_ready < offset + len)
940 vcdev->config_ready = offset + len;
941 spin_unlock_irqrestore(&vcdev->lock, flags);
942 if (buf)
943 memcpy(buf, config_area + offset, len);
944
945 out_free:
946 ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE);
947 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
948 }
949
950 static void virtio_ccw_set_config(struct virtio_device *vdev,
951 unsigned int offset, const void *buf,
952 unsigned len)
953 {
954 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
955 struct ccw1 *ccw;
956 void *config_area;
957 unsigned long flags;
958
959 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL);
960 if (!ccw)
961 return;
962
963 config_area = ccw_device_dma_zalloc(vcdev->cdev,
964 VIRTIO_CCW_CONFIG_SIZE,
965 &ccw->cda);
966 if (!config_area)
967 goto out_free;
968
969 /* Make sure we don't overwrite fields. */
970 if (vcdev->config_ready < offset)
971 virtio_ccw_get_config(vdev, 0, NULL, offset);
972 spin_lock_irqsave(&vcdev->lock, flags);
973 memcpy(&vcdev->config[offset], buf, len);
974 /* Write the config area to the host. */
975 memcpy(config_area, vcdev->config, sizeof(vcdev->config));
976 spin_unlock_irqrestore(&vcdev->lock, flags);
977 ccw->cmd_code = CCW_CMD_WRITE_CONF;
978 ccw->flags = 0;
979 ccw->count = offset + len;
980 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG);
981
982 out_free:
983 ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE);
984 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
985 }
986
987 static u8 virtio_ccw_get_status(struct virtio_device *vdev)
988 {
989 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
990 u8 old_status = vcdev->dma_area->status;
991 struct ccw1 *ccw;
992
993 if (vcdev->revision < 2)
994 return vcdev->dma_area->status;
995
996 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL);
997 if (!ccw)
998 return old_status;
999
1000 ccw->cmd_code = CCW_CMD_READ_STATUS;
1001 ccw->flags = 0;
1002 ccw->count = sizeof(vcdev->dma_area->status);
1003 ccw->cda = status_dma(vcdev);
1004 ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS);
1005 /*
1006 * If the channel program failed (should only happen if the device
1007 * was hotunplugged, and then we clean up via the machine check
1008 * handler anyway), vcdev->dma_area->status was not overwritten and we just
1009 * return the old status, which is fine.
1010 */
1011 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
1012
1013 return vcdev->dma_area->status;
1014 }
1015
1016 static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status)
1017 {
1018 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
1019 u8 old_status = vcdev->dma_area->status;
1020 struct ccw1 *ccw;
1021 int ret;
1022
1023 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL);
1024 if (!ccw)
1025 return;
1026
1027 /* Write the status to the host. */
1028 vcdev->dma_area->status = status;
1029 ccw->cmd_code = CCW_CMD_WRITE_STATUS;
1030 ccw->flags = 0;
1031 ccw->count = sizeof(status);
1032 /* We use ssch for setting the status which is a serializing
1033 * instruction that guarantees the memory writes have
1034 * completed before ssch.
1035 */
1036 ccw->cda = status_dma(vcdev);
1037 ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS);
1038 /* Write failed? We assume status is unchanged. */
1039 if (ret)
1040 vcdev->dma_area->status = old_status;
1041 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
1042 }
1043
1044 static const char *virtio_ccw_bus_name(struct virtio_device *vdev)
1045 {
1046 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
1047
1048 return dev_name(&vcdev->cdev->dev);
1049 }
1050
1051 static void virtio_ccw_synchronize_cbs(struct virtio_device *vdev)
1052 {
1053 struct virtio_ccw_device *vcdev = to_vc_device(vdev);
1054 struct airq_info *info = vcdev->airq_info;
1055
1056 if (info) {
1057 /*
1058 * This device uses adapter interrupts: synchronize with
1059 * vring_interrupt() called by virtio_airq_handler()
1060 * via the indicator area lock.
1061 */
1062 write_lock_irq(&info->lock);
1063 write_unlock_irq(&info->lock);
1064 } else {
1065 /* This device uses classic interrupts: synchronize
1066 * with vring_interrupt() called by
1067 * virtio_ccw_int_handler() via the per-device
1068 * irq_lock
1069 */
1070 write_lock_irq(&vcdev->irq_lock);
1071 write_unlock_irq(&vcdev->irq_lock);
1072 }
1073 }
1074
1075 static const struct virtio_config_ops virtio_ccw_config_ops = {
1076 .get_features = virtio_ccw_get_features,
1077 .finalize_features = virtio_ccw_finalize_features,
1078 .get = virtio_ccw_get_config,
1079 .set = virtio_ccw_set_config,
1080 .get_status = virtio_ccw_get_status,
1081 .set_status = virtio_ccw_set_status,
1082 .reset = virtio_ccw_reset,
1083 .find_vqs = virtio_ccw_find_vqs,
1084 .del_vqs = virtio_ccw_del_vqs,
1085 .bus_name = virtio_ccw_bus_name,
1086 .synchronize_cbs = virtio_ccw_synchronize_cbs,
1087 };
1088
1089
1090 /*
1091 * ccw bus driver related functions
1092 */
1093
1094 static void virtio_ccw_release_dev(struct device *_d)
1095 {
1096 struct virtio_device *dev = dev_to_virtio(_d);
1097 struct virtio_ccw_device *vcdev = to_vc_device(dev);
1098
1099 ccw_device_dma_free(vcdev->cdev, vcdev->dma_area,
1100 sizeof(*vcdev->dma_area));
1101 kfree(vcdev);
1102 }
1103
1104 static int irb_is_error(struct irb *irb)
1105 {
1106 if (scsw_cstat(&irb->scsw) != 0)
1107 return 1;
1108 if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))
1109 return 1;
1110 if (scsw_cc(&irb->scsw) != 0)
1111 return 1;
1112 return 0;
1113 }
1114
1115 static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev,
1116 int index)
1117 {
1118 struct virtio_ccw_vq_info *info;
1119 unsigned long flags;
1120 struct virtqueue *vq;
1121
1122 vq = NULL;
1123 spin_lock_irqsave(&vcdev->lock, flags);
1124 list_for_each_entry(info, &vcdev->virtqueues, node) {
1125 if (info->vq->index == index) {
1126 vq = info->vq;
1127 break;
1128 }
1129 }
1130 spin_unlock_irqrestore(&vcdev->lock, flags);
1131 return vq;
1132 }
1133
1134 static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev,
1135 __u32 activity)
1136 {
1137 if (vcdev->curr_io & activity) {
1138 switch (activity) {
1139 case VIRTIO_CCW_DOING_READ_FEAT:
1140 case VIRTIO_CCW_DOING_WRITE_FEAT:
1141 case VIRTIO_CCW_DOING_READ_CONFIG:
1142 case VIRTIO_CCW_DOING_WRITE_CONFIG:
1143 case VIRTIO_CCW_DOING_WRITE_STATUS:
1144 case VIRTIO_CCW_DOING_READ_STATUS:
1145 case VIRTIO_CCW_DOING_SET_VQ:
1146 case VIRTIO_CCW_DOING_SET_IND:
1147 case VIRTIO_CCW_DOING_SET_CONF_IND:
1148 case VIRTIO_CCW_DOING_RESET:
1149 case VIRTIO_CCW_DOING_READ_VQ_CONF:
1150 case VIRTIO_CCW_DOING_SET_IND_ADAPTER:
1151 case VIRTIO_CCW_DOING_SET_VIRTIO_REV:
1152 vcdev->curr_io &= ~activity;
1153 wake_up(&vcdev->wait_q);
1154 break;
1155 default:
1156 /* don't know what to do... */
1157 dev_warn(&vcdev->cdev->dev,
1158 "Suspicious activity '%08x'\n", activity);
1159 WARN_ON(1);
1160 break;
1161 }
1162 }
1163 }
1164
1165 static void virtio_ccw_int_handler(struct ccw_device *cdev,
1166 unsigned long intparm,
1167 struct irb *irb)
1168 {
1169 __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK;
1170 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1171 int i;
1172 struct virtqueue *vq;
1173
1174 if (!vcdev)
1175 return;
1176 if (IS_ERR(irb)) {
1177 vcdev->err = PTR_ERR(irb);
1178 virtio_ccw_check_activity(vcdev, activity);
1179 /* Don't poke around indicators, something's wrong. */
1180 return;
1181 }
1182 /* Check if it's a notification from the host. */
1183 if ((intparm == 0) &&
1184 (scsw_stctl(&irb->scsw) ==
1185 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) {
1186 /* OK */
1187 }
1188 if (irb_is_error(irb)) {
1189 /* Command reject? */
1190 if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
1191 (irb->ecw[0] & SNS0_CMD_REJECT))
1192 vcdev->err = -EOPNOTSUPP;
1193 else
1194 /* Map everything else to -EIO. */
1195 vcdev->err = -EIO;
1196 }
1197 virtio_ccw_check_activity(vcdev, activity);
1198 #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION
1199 /*
1200 * Paired with virtio_ccw_synchronize_cbs() and interrupts are
1201 * disabled here.
1202 */
1203 read_lock(&vcdev->irq_lock);
1204 #endif
1205 for_each_set_bit(i, indicators(vcdev),
1206 sizeof(*indicators(vcdev)) * BITS_PER_BYTE) {
1207 /* The bit clear must happen before the vring kick. */
1208 clear_bit(i, indicators(vcdev));
1209 barrier();
1210 vq = virtio_ccw_vq_by_ind(vcdev, i);
1211 vring_interrupt(0, vq);
1212 }
1213 #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION
1214 read_unlock(&vcdev->irq_lock);
1215 #endif
1216 if (test_bit(0, indicators2(vcdev))) {
1217 virtio_config_changed(&vcdev->vdev);
1218 clear_bit(0, indicators2(vcdev));
1219 }
1220 }
1221
1222 /*
1223 * We usually want to autoonline all devices, but give the admin
1224 * a way to exempt devices from this.
1225 */
1226 #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
1227 (8*sizeof(long)))
1228 static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS];
1229
1230 static char *no_auto = "";
1231
1232 module_param(no_auto, charp, 0444);
1233 MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined");
1234
1235 static int virtio_ccw_check_autoonline(struct ccw_device *cdev)
1236 {
1237 struct ccw_dev_id id;
1238
1239 ccw_device_get_id(cdev, &id);
1240 if (test_bit(id.devno, devs_no_auto[id.ssid]))
1241 return 0;
1242 return 1;
1243 }
1244
1245 static void virtio_ccw_auto_online(void *data, async_cookie_t cookie)
1246 {
1247 struct ccw_device *cdev = data;
1248 int ret;
1249
1250 ret = ccw_device_set_online(cdev);
1251 if (ret)
1252 dev_warn(&cdev->dev, "Failed to set online: %d\n", ret);
1253 }
1254
1255 static int virtio_ccw_probe(struct ccw_device *cdev)
1256 {
1257 cdev->handler = virtio_ccw_int_handler;
1258
1259 if (virtio_ccw_check_autoonline(cdev))
1260 async_schedule(virtio_ccw_auto_online, cdev);
1261 return 0;
1262 }
1263
1264 static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev)
1265 {
1266 unsigned long flags;
1267 struct virtio_ccw_device *vcdev;
1268
1269 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1270 vcdev = dev_get_drvdata(&cdev->dev);
1271 if (!vcdev || vcdev->going_away) {
1272 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1273 return NULL;
1274 }
1275 vcdev->going_away = true;
1276 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1277 return vcdev;
1278 }
1279
1280 static void virtio_ccw_remove(struct ccw_device *cdev)
1281 {
1282 unsigned long flags;
1283 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1284
1285 if (vcdev && cdev->online) {
1286 if (vcdev->device_lost)
1287 virtio_break_device(&vcdev->vdev);
1288 unregister_virtio_device(&vcdev->vdev);
1289 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1290 dev_set_drvdata(&cdev->dev, NULL);
1291 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1292 }
1293 cdev->handler = NULL;
1294 }
1295
1296 static int virtio_ccw_offline(struct ccw_device *cdev)
1297 {
1298 unsigned long flags;
1299 struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev);
1300
1301 if (!vcdev)
1302 return 0;
1303 if (vcdev->device_lost)
1304 virtio_break_device(&vcdev->vdev);
1305 unregister_virtio_device(&vcdev->vdev);
1306 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1307 dev_set_drvdata(&cdev->dev, NULL);
1308 cdev->dev.dma_parms = NULL;
1309 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1310 return 0;
1311 }
1312
1313 static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev)
1314 {
1315 struct virtio_rev_info *rev;
1316 struct ccw1 *ccw;
1317 int ret;
1318
1319 ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw), NULL);
1320 if (!ccw)
1321 return -ENOMEM;
1322 rev = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*rev), &ccw->cda);
1323 if (!rev) {
1324 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
1325 return -ENOMEM;
1326 }
1327
1328 /* Set transport revision */
1329 ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV;
1330 ccw->flags = 0;
1331 ccw->count = sizeof(*rev);
1332
1333 vcdev->revision = VIRTIO_CCW_REV_MAX;
1334 do {
1335 rev->revision = vcdev->revision;
1336 /* none of our supported revisions carry payload */
1337 rev->length = 0;
1338 ret = ccw_io_helper(vcdev, ccw,
1339 VIRTIO_CCW_DOING_SET_VIRTIO_REV);
1340 if (ret == -EOPNOTSUPP) {
1341 if (vcdev->revision == 0)
1342 /*
1343 * The host device does not support setting
1344 * the revision: let's operate it in legacy
1345 * mode.
1346 */
1347 ret = 0;
1348 else
1349 vcdev->revision--;
1350 }
1351 } while (ret == -EOPNOTSUPP);
1352
1353 ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
1354 ccw_device_dma_free(vcdev->cdev, rev, sizeof(*rev));
1355 return ret;
1356 }
1357
1358 static int virtio_ccw_online(struct ccw_device *cdev)
1359 {
1360 int ret;
1361 struct virtio_ccw_device *vcdev;
1362 unsigned long flags;
1363
1364 vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL);
1365 if (!vcdev) {
1366 dev_warn(&cdev->dev, "Could not get memory for virtio\n");
1367 ret = -ENOMEM;
1368 goto out_free;
1369 }
1370 vcdev->vdev.dev.parent = &cdev->dev;
1371 vcdev->cdev = cdev;
1372 cdev->dev.dma_parms = &vcdev->dma_parms;
1373 vcdev->dma_area = ccw_device_dma_zalloc(vcdev->cdev,
1374 sizeof(*vcdev->dma_area),
1375 &vcdev->dma_area_addr);
1376 if (!vcdev->dma_area) {
1377 ret = -ENOMEM;
1378 goto out_free;
1379 }
1380
1381 vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */
1382
1383 vcdev->vdev.dev.release = virtio_ccw_release_dev;
1384 vcdev->vdev.config = &virtio_ccw_config_ops;
1385 init_waitqueue_head(&vcdev->wait_q);
1386 INIT_LIST_HEAD(&vcdev->virtqueues);
1387 spin_lock_init(&vcdev->lock);
1388 rwlock_init(&vcdev->irq_lock);
1389 mutex_init(&vcdev->io_lock);
1390
1391 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1392 dev_set_drvdata(&cdev->dev, vcdev);
1393 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1394 vcdev->vdev.id.vendor = cdev->id.cu_type;
1395 vcdev->vdev.id.device = cdev->id.cu_model;
1396
1397 ret = virtio_ccw_set_transport_rev(vcdev);
1398 if (ret)
1399 goto out_free;
1400
1401 ret = register_virtio_device(&vcdev->vdev);
1402 if (ret) {
1403 dev_warn(&cdev->dev, "Failed to register virtio device: %d\n",
1404 ret);
1405 goto out_put;
1406 }
1407 return 0;
1408 out_put:
1409 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1410 dev_set_drvdata(&cdev->dev, NULL);
1411 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1412 put_device(&vcdev->vdev.dev);
1413 return ret;
1414 out_free:
1415 if (vcdev) {
1416 ccw_device_dma_free(vcdev->cdev, vcdev->dma_area,
1417 sizeof(*vcdev->dma_area));
1418 }
1419 kfree(vcdev);
1420 return ret;
1421 }
1422
1423 static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event)
1424 {
1425 int rc;
1426 struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev);
1427
1428 /*
1429 * Make sure vcdev is set
1430 * i.e. set_offline/remove callback not already running
1431 */
1432 if (!vcdev)
1433 return NOTIFY_DONE;
1434
1435 switch (event) {
1436 case CIO_GONE:
1437 vcdev->device_lost = true;
1438 rc = NOTIFY_DONE;
1439 break;
1440 case CIO_OPER:
1441 rc = NOTIFY_OK;
1442 break;
1443 default:
1444 rc = NOTIFY_DONE;
1445 break;
1446 }
1447 return rc;
1448 }
1449
1450 static struct ccw_device_id virtio_ids[] = {
1451 { CCW_DEVICE(0x3832, 0) },
1452 {},
1453 };
1454
1455 static struct ccw_driver virtio_ccw_driver = {
1456 .driver = {
1457 .owner = THIS_MODULE,
1458 .name = "virtio_ccw",
1459 },
1460 .ids = virtio_ids,
1461 .probe = virtio_ccw_probe,
1462 .remove = virtio_ccw_remove,
1463 .set_offline = virtio_ccw_offline,
1464 .set_online = virtio_ccw_online,
1465 .notify = virtio_ccw_cio_notify,
1466 .int_class = IRQIO_VIR,
1467 };
1468
1469 static int __init pure_hex(char **cp, unsigned int *val, int min_digit,
1470 int max_digit, int max_val)
1471 {
1472 int diff;
1473
1474 diff = 0;
1475 *val = 0;
1476
1477 while (diff <= max_digit) {
1478 int value = hex_to_bin(**cp);
1479
1480 if (value < 0)
1481 break;
1482 *val = *val * 16 + value;
1483 (*cp)++;
1484 diff++;
1485 }
1486
1487 if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
1488 return 1;
1489
1490 return 0;
1491 }
1492
1493 static int __init parse_busid(char *str, unsigned int *cssid,
1494 unsigned int *ssid, unsigned int *devno)
1495 {
1496 char *str_work;
1497 int rc, ret;
1498
1499 rc = 1;
1500
1501 if (*str == '\0')
1502 goto out;
1503
1504 str_work = str;
1505 ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
1506 if (ret || (str_work[0] != '.'))
1507 goto out;
1508 str_work++;
1509 ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
1510 if (ret || (str_work[0] != '.'))
1511 goto out;
1512 str_work++;
1513 ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
1514 if (ret || (str_work[0] != '\0'))
1515 goto out;
1516
1517 rc = 0;
1518 out:
1519 return rc;
1520 }
1521
1522 static void __init no_auto_parse(void)
1523 {
1524 unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
1525 char *parm, *str;
1526 int rc;
1527
1528 str = no_auto;
1529 while ((parm = strsep(&str, ","))) {
1530 rc = parse_busid(strsep(&parm, "-"), &from_cssid,
1531 &from_ssid, &from);
1532 if (rc)
1533 continue;
1534 if (parm != NULL) {
1535 rc = parse_busid(parm, &to_cssid,
1536 &to_ssid, &to);
1537 if ((from_ssid > to_ssid) ||
1538 ((from_ssid == to_ssid) && (from > to)))
1539 rc = -EINVAL;
1540 } else {
1541 to_cssid = from_cssid;
1542 to_ssid = from_ssid;
1543 to = from;
1544 }
1545 if (rc)
1546 continue;
1547 while ((from_ssid < to_ssid) ||
1548 ((from_ssid == to_ssid) && (from <= to))) {
1549 set_bit(from, devs_no_auto[from_ssid]);
1550 from++;
1551 if (from > __MAX_SUBCHANNEL) {
1552 from_ssid++;
1553 from = 0;
1554 }
1555 }
1556 }
1557 }
1558
1559 static int __init virtio_ccw_init(void)
1560 {
1561 int rc;
1562
1563 /* parse no_auto string before we do anything further */
1564 no_auto_parse();
1565
1566 summary_indicators = cio_dma_zalloc(MAX_AIRQ_AREAS);
1567 if (!summary_indicators)
1568 return -ENOMEM;
1569 rc = ccw_driver_register(&virtio_ccw_driver);
1570 if (rc)
1571 cio_dma_free(summary_indicators, MAX_AIRQ_AREAS);
1572 return rc;
1573 }
1574 device_initcall(virtio_ccw_init);
Kernel DRM miscellaneous fixes and cross-tree changes