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 | __u32 curr_io; |
62 | int err; |
63 | unsigned int revision; /* Transport revision */ |
64 | wait_queue_head_t wait_q; |
65 | spinlock_t lock; |
66 | rwlock_t irq_lock; |
67 | struct mutex io_lock; /* Serializes I/O requests */ |
68 | struct list_head virtqueues; |
69 | bool is_thinint; |
70 | bool going_away; |
71 | bool device_lost; |
72 | unsigned int config_ready; |
73 | void *airq_info; |
74 | struct vcdev_dma_area *dma_area; |
75 | }; |
76 | |
77 | static inline unsigned long *indicators(struct virtio_ccw_device *vcdev) |
78 | { |
79 | return &vcdev->dma_area->indicators; |
80 | } |
81 | |
82 | static inline unsigned long *indicators2(struct virtio_ccw_device *vcdev) |
83 | { |
84 | return &vcdev->dma_area->indicators2; |
85 | } |
86 | |
87 | struct vq_info_block_legacy { |
88 | __u64 queue; |
89 | __u32 align; |
90 | __u16 index; |
91 | __u16 num; |
92 | } __packed; |
93 | |
94 | struct vq_info_block { |
95 | __u64 desc; |
96 | __u32 res0; |
97 | __u16 index; |
98 | __u16 num; |
99 | __u64 avail; |
100 | __u64 used; |
101 | } __packed; |
102 | |
103 | struct virtio_feature_desc { |
104 | __le32 features; |
105 | __u8 index; |
106 | } __packed; |
107 | |
108 | struct virtio_thinint_area { |
109 | unsigned long summary_indicator; |
110 | unsigned long indicator; |
111 | u64 bit_nr; |
112 | u8 isc; |
113 | } __packed; |
114 | |
115 | struct virtio_rev_info { |
116 | __u16 revision; |
117 | __u16 length; |
118 | __u8 data[]; |
119 | }; |
120 | |
121 | /* the highest virtio-ccw revision we support */ |
122 | #define VIRTIO_CCW_REV_MAX 2 |
123 | |
124 | struct virtio_ccw_vq_info { |
125 | struct virtqueue *vq; |
126 | int num; |
127 | union { |
128 | struct vq_info_block s; |
129 | struct vq_info_block_legacy l; |
130 | } *info_block; |
131 | int bit_nr; |
132 | struct list_head node; |
133 | long cookie; |
134 | }; |
135 | |
136 | #define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */ |
137 | |
138 | #define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8) |
139 | #define MAX_AIRQ_AREAS 20 |
140 | |
141 | static int virtio_ccw_use_airq = 1; |
142 | |
143 | struct airq_info { |
144 | rwlock_t lock; |
145 | u8 summary_indicator_idx; |
146 | struct airq_struct airq; |
147 | struct airq_iv *aiv; |
148 | }; |
149 | static struct airq_info *airq_areas[MAX_AIRQ_AREAS]; |
150 | static DEFINE_MUTEX(airq_areas_lock); |
151 | |
152 | static u8 *summary_indicators; |
153 | |
154 | static inline u8 *get_summary_indicator(struct airq_info *info) |
155 | { |
156 | return summary_indicators + info->summary_indicator_idx; |
157 | } |
158 | |
159 | #define CCW_CMD_SET_VQ 0x13 |
160 | #define CCW_CMD_VDEV_RESET 0x33 |
161 | #define CCW_CMD_SET_IND 0x43 |
162 | #define CCW_CMD_SET_CONF_IND 0x53 |
163 | #define CCW_CMD_READ_FEAT 0x12 |
164 | #define CCW_CMD_WRITE_FEAT 0x11 |
165 | #define CCW_CMD_READ_CONF 0x22 |
166 | #define CCW_CMD_WRITE_CONF 0x21 |
167 | #define CCW_CMD_WRITE_STATUS 0x31 |
168 | #define CCW_CMD_READ_VQ_CONF 0x32 |
169 | #define CCW_CMD_READ_STATUS 0x72 |
170 | #define CCW_CMD_SET_IND_ADAPTER 0x73 |
171 | #define CCW_CMD_SET_VIRTIO_REV 0x83 |
172 | |
173 | #define VIRTIO_CCW_DOING_SET_VQ 0x00010000 |
174 | #define VIRTIO_CCW_DOING_RESET 0x00040000 |
175 | #define VIRTIO_CCW_DOING_READ_FEAT 0x00080000 |
176 | #define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000 |
177 | #define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000 |
178 | #define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000 |
179 | #define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000 |
180 | #define VIRTIO_CCW_DOING_SET_IND 0x01000000 |
181 | #define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000 |
182 | #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000 |
183 | #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000 |
184 | #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000 |
185 | #define VIRTIO_CCW_DOING_READ_STATUS 0x20000000 |
186 | #define VIRTIO_CCW_INTPARM_MASK 0xffff0000 |
187 | |
188 | static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev) |
189 | { |
190 | return container_of(vdev, struct virtio_ccw_device, vdev); |
191 | } |
192 | |
193 | static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info) |
194 | { |
195 | unsigned long i, flags; |
196 | |
197 | write_lock_irqsave(&info->lock, flags); |
198 | for (i = 0; i < airq_iv_end(info->aiv); i++) { |
199 | if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) { |
200 | airq_iv_free_bit(info->aiv, i); |
201 | airq_iv_set_ptr(info->aiv, i, 0); |
202 | break; |
203 | } |
204 | } |
205 | write_unlock_irqrestore(&info->lock, flags); |
206 | } |
207 | |
208 | static void virtio_airq_handler(struct airq_struct *airq, |
209 | struct tpi_info *tpi_info) |
210 | { |
211 | struct airq_info *info = container_of(airq, struct airq_info, airq); |
212 | unsigned long ai; |
213 | |
214 | inc_irq_stat(IRQIO_VAI); |
215 | read_lock(&info->lock); |
216 | /* Walk through indicators field, summary indicator active. */ |
217 | for (ai = 0;;) { |
218 | ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); |
219 | if (ai == -1UL) |
220 | break; |
221 | vring_interrupt(irq: 0, vq: (void *)airq_iv_get_ptr(info->aiv, ai)); |
222 | } |
223 | *(get_summary_indicator(info)) = 0; |
224 | smp_wmb(); |
225 | /* Walk through indicators field, summary indicator not active. */ |
226 | for (ai = 0;;) { |
227 | ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); |
228 | if (ai == -1UL) |
229 | break; |
230 | vring_interrupt(irq: 0, vq: (void *)airq_iv_get_ptr(info->aiv, ai)); |
231 | } |
232 | read_unlock(&info->lock); |
233 | } |
234 | |
235 | static struct airq_info *new_airq_info(int index) |
236 | { |
237 | struct airq_info *info; |
238 | int rc; |
239 | |
240 | info = kzalloc(size: sizeof(*info), GFP_KERNEL); |
241 | if (!info) |
242 | return NULL; |
243 | rwlock_init(&info->lock); |
244 | info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR |
245 | | AIRQ_IV_CACHELINE, NULL); |
246 | if (!info->aiv) { |
247 | kfree(objp: info); |
248 | return NULL; |
249 | } |
250 | info->airq.handler = virtio_airq_handler; |
251 | info->summary_indicator_idx = index; |
252 | info->airq.lsi_ptr = get_summary_indicator(info); |
253 | info->airq.isc = VIRTIO_AIRQ_ISC; |
254 | rc = register_adapter_interrupt(&info->airq); |
255 | if (rc) { |
256 | airq_iv_release(info->aiv); |
257 | kfree(objp: info); |
258 | return NULL; |
259 | } |
260 | return info; |
261 | } |
262 | |
263 | static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs, |
264 | u64 *first, void **airq_info) |
265 | { |
266 | int i, j; |
267 | struct airq_info *info; |
268 | unsigned long indicator_addr = 0; |
269 | unsigned long bit, flags; |
270 | |
271 | for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) { |
272 | mutex_lock(&airq_areas_lock); |
273 | if (!airq_areas[i]) |
274 | airq_areas[i] = new_airq_info(index: i); |
275 | info = airq_areas[i]; |
276 | mutex_unlock(lock: &airq_areas_lock); |
277 | if (!info) |
278 | return 0; |
279 | write_lock_irqsave(&info->lock, flags); |
280 | bit = airq_iv_alloc(info->aiv, nvqs); |
281 | if (bit == -1UL) { |
282 | /* Not enough vacancies. */ |
283 | write_unlock_irqrestore(&info->lock, flags); |
284 | continue; |
285 | } |
286 | *first = bit; |
287 | *airq_info = info; |
288 | indicator_addr = (unsigned long)info->aiv->vector; |
289 | for (j = 0; j < nvqs; j++) { |
290 | airq_iv_set_ptr(info->aiv, bit + j, |
291 | (unsigned long)vqs[j]); |
292 | } |
293 | write_unlock_irqrestore(&info->lock, flags); |
294 | } |
295 | return indicator_addr; |
296 | } |
297 | |
298 | static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev) |
299 | { |
300 | struct virtio_ccw_vq_info *info; |
301 | |
302 | if (!vcdev->airq_info) |
303 | return; |
304 | list_for_each_entry(info, &vcdev->virtqueues, node) |
305 | drop_airq_indicator(vq: info->vq, info: vcdev->airq_info); |
306 | } |
307 | |
308 | static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag) |
309 | { |
310 | unsigned long flags; |
311 | __u32 ret; |
312 | |
313 | spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); |
314 | if (vcdev->err) |
315 | ret = 0; |
316 | else |
317 | ret = vcdev->curr_io & flag; |
318 | spin_unlock_irqrestore(lock: get_ccwdev_lock(vcdev->cdev), flags); |
319 | return ret; |
320 | } |
321 | |
322 | static int ccw_io_helper(struct virtio_ccw_device *vcdev, |
323 | struct ccw1 *ccw, __u32 intparm) |
324 | { |
325 | int ret; |
326 | unsigned long flags; |
327 | int flag = intparm & VIRTIO_CCW_INTPARM_MASK; |
328 | |
329 | mutex_lock(&vcdev->io_lock); |
330 | do { |
331 | spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); |
332 | ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0); |
333 | if (!ret) { |
334 | if (!vcdev->curr_io) |
335 | vcdev->err = 0; |
336 | vcdev->curr_io |= flag; |
337 | } |
338 | spin_unlock_irqrestore(lock: get_ccwdev_lock(vcdev->cdev), flags); |
339 | cpu_relax(); |
340 | } while (ret == -EBUSY); |
341 | wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0); |
342 | ret = ret ? ret : vcdev->err; |
343 | mutex_unlock(lock: &vcdev->io_lock); |
344 | return ret; |
345 | } |
346 | |
347 | static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev, |
348 | struct ccw1 *ccw) |
349 | { |
350 | int ret; |
351 | unsigned long *indicatorp = NULL; |
352 | struct virtio_thinint_area *thinint_area = NULL; |
353 | struct airq_info *airq_info = vcdev->airq_info; |
354 | |
355 | if (vcdev->is_thinint) { |
356 | thinint_area = ccw_device_dma_zalloc(vcdev->cdev, |
357 | sizeof(*thinint_area)); |
358 | if (!thinint_area) |
359 | return; |
360 | thinint_area->summary_indicator = |
361 | (unsigned long) get_summary_indicator(info: airq_info); |
362 | thinint_area->isc = VIRTIO_AIRQ_ISC; |
363 | ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; |
364 | ccw->count = sizeof(*thinint_area); |
365 | ccw->cda = (__u32)virt_to_phys(address: thinint_area); |
366 | } else { |
367 | /* payload is the address of the indicators */ |
368 | indicatorp = ccw_device_dma_zalloc(vcdev->cdev, |
369 | sizeof(indicators(vcdev))); |
370 | if (!indicatorp) |
371 | return; |
372 | *indicatorp = 0; |
373 | ccw->cmd_code = CCW_CMD_SET_IND; |
374 | ccw->count = sizeof(indicators(vcdev)); |
375 | ccw->cda = (__u32)virt_to_phys(address: indicatorp); |
376 | } |
377 | /* Deregister indicators from host. */ |
378 | *indicators(vcdev) = 0; |
379 | ccw->flags = 0; |
380 | ret = ccw_io_helper(vcdev, ccw, |
381 | intparm: vcdev->is_thinint ? |
382 | VIRTIO_CCW_DOING_SET_IND_ADAPTER : |
383 | VIRTIO_CCW_DOING_SET_IND); |
384 | if (ret && (ret != -ENODEV)) |
385 | dev_info(&vcdev->cdev->dev, |
386 | "Failed to deregister indicators (%d)\n" , ret); |
387 | else if (vcdev->is_thinint) |
388 | virtio_ccw_drop_indicators(vcdev); |
389 | ccw_device_dma_free(vcdev->cdev, indicatorp, sizeof(indicators(vcdev))); |
390 | ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area)); |
391 | } |
392 | |
393 | static inline bool virtio_ccw_do_kvm_notify(struct virtqueue *vq, u32 data) |
394 | { |
395 | struct virtio_ccw_vq_info *info = vq->priv; |
396 | struct virtio_ccw_device *vcdev; |
397 | struct subchannel_id schid; |
398 | |
399 | vcdev = to_vc_device(vdev: info->vq->vdev); |
400 | ccw_device_get_schid(vcdev->cdev, &schid); |
401 | BUILD_BUG_ON(sizeof(struct subchannel_id) != sizeof(unsigned int)); |
402 | info->cookie = kvm_hypercall3(nr: KVM_S390_VIRTIO_CCW_NOTIFY, |
403 | p1: *((unsigned int *)&schid), |
404 | p2: data, p3: info->cookie); |
405 | if (info->cookie < 0) |
406 | return false; |
407 | return true; |
408 | } |
409 | |
410 | static bool virtio_ccw_kvm_notify(struct virtqueue *vq) |
411 | { |
412 | return virtio_ccw_do_kvm_notify(vq, data: vq->index); |
413 | } |
414 | |
415 | static bool virtio_ccw_kvm_notify_with_data(struct virtqueue *vq) |
416 | { |
417 | return virtio_ccw_do_kvm_notify(vq, data: vring_notification_data(vq: vq)); |
418 | } |
419 | |
420 | static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, |
421 | struct ccw1 *ccw, int index) |
422 | { |
423 | int ret; |
424 | |
425 | vcdev->dma_area->config_block.index = index; |
426 | ccw->cmd_code = CCW_CMD_READ_VQ_CONF; |
427 | ccw->flags = 0; |
428 | ccw->count = sizeof(struct vq_config_block); |
429 | ccw->cda = (__u32)virt_to_phys(address: &vcdev->dma_area->config_block); |
430 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF); |
431 | if (ret) |
432 | return ret; |
433 | return vcdev->dma_area->config_block.num ?: -ENOENT; |
434 | } |
435 | |
436 | static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw) |
437 | { |
438 | struct virtio_ccw_device *vcdev = to_vc_device(vdev: vq->vdev); |
439 | struct virtio_ccw_vq_info *info = vq->priv; |
440 | unsigned long flags; |
441 | int ret; |
442 | unsigned int index = vq->index; |
443 | |
444 | /* Remove from our list. */ |
445 | spin_lock_irqsave(&vcdev->lock, flags); |
446 | list_del(entry: &info->node); |
447 | spin_unlock_irqrestore(lock: &vcdev->lock, flags); |
448 | |
449 | /* Release from host. */ |
450 | if (vcdev->revision == 0) { |
451 | info->info_block->l.queue = 0; |
452 | info->info_block->l.align = 0; |
453 | info->info_block->l.index = index; |
454 | info->info_block->l.num = 0; |
455 | ccw->count = sizeof(info->info_block->l); |
456 | } else { |
457 | info->info_block->s.desc = 0; |
458 | info->info_block->s.index = index; |
459 | info->info_block->s.num = 0; |
460 | info->info_block->s.avail = 0; |
461 | info->info_block->s.used = 0; |
462 | ccw->count = sizeof(info->info_block->s); |
463 | } |
464 | ccw->cmd_code = CCW_CMD_SET_VQ; |
465 | ccw->flags = 0; |
466 | ccw->cda = (__u32)virt_to_phys(address: info->info_block); |
467 | ret = ccw_io_helper(vcdev, ccw, |
468 | VIRTIO_CCW_DOING_SET_VQ | index); |
469 | /* |
470 | * -ENODEV isn't considered an error: The device is gone anyway. |
471 | * This may happen on device detach. |
472 | */ |
473 | if (ret && (ret != -ENODEV)) |
474 | dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n" , |
475 | ret, index); |
476 | |
477 | vring_del_virtqueue(vq); |
478 | ccw_device_dma_free(vcdev->cdev, info->info_block, |
479 | sizeof(*info->info_block)); |
480 | kfree(objp: info); |
481 | } |
482 | |
483 | static void virtio_ccw_del_vqs(struct virtio_device *vdev) |
484 | { |
485 | struct virtqueue *vq, *n; |
486 | struct ccw1 *ccw; |
487 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
488 | |
489 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
490 | if (!ccw) |
491 | return; |
492 | |
493 | virtio_ccw_drop_indicator(vcdev, ccw); |
494 | |
495 | list_for_each_entry_safe(vq, n, &vdev->vqs, list) |
496 | virtio_ccw_del_vq(vq, ccw); |
497 | |
498 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
499 | } |
500 | |
501 | static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, |
502 | int i, vq_callback_t *callback, |
503 | const char *name, bool ctx, |
504 | struct ccw1 *ccw) |
505 | { |
506 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
507 | bool (*notify)(struct virtqueue *vq); |
508 | int err; |
509 | struct virtqueue *vq = NULL; |
510 | struct virtio_ccw_vq_info *info; |
511 | u64 queue; |
512 | unsigned long flags; |
513 | bool may_reduce; |
514 | |
515 | if (__virtio_test_bit(vdev, VIRTIO_F_NOTIFICATION_DATA)) |
516 | notify = virtio_ccw_kvm_notify_with_data; |
517 | else |
518 | notify = virtio_ccw_kvm_notify; |
519 | |
520 | /* Allocate queue. */ |
521 | info = kzalloc(size: sizeof(struct virtio_ccw_vq_info), GFP_KERNEL); |
522 | if (!info) { |
523 | dev_warn(&vcdev->cdev->dev, "no info\n" ); |
524 | err = -ENOMEM; |
525 | goto out_err; |
526 | } |
527 | info->info_block = ccw_device_dma_zalloc(vcdev->cdev, |
528 | sizeof(*info->info_block)); |
529 | if (!info->info_block) { |
530 | dev_warn(&vcdev->cdev->dev, "no info block\n" ); |
531 | err = -ENOMEM; |
532 | goto out_err; |
533 | } |
534 | info->num = virtio_ccw_read_vq_conf(vcdev, ccw, index: i); |
535 | if (info->num < 0) { |
536 | err = info->num; |
537 | goto out_err; |
538 | } |
539 | may_reduce = vcdev->revision > 0; |
540 | vq = vring_create_virtqueue(index: i, num: info->num, vring_align: KVM_VIRTIO_CCW_RING_ALIGN, |
541 | vdev, weak_barriers: true, may_reduce_num: may_reduce, ctx, |
542 | notify, callback, name); |
543 | |
544 | if (!vq) { |
545 | /* For now, we fail if we can't get the requested size. */ |
546 | dev_warn(&vcdev->cdev->dev, "no vq\n" ); |
547 | err = -ENOMEM; |
548 | goto out_err; |
549 | } |
550 | |
551 | vq->num_max = info->num; |
552 | |
553 | /* it may have been reduced */ |
554 | info->num = virtqueue_get_vring_size(vq); |
555 | |
556 | /* Register it with the host. */ |
557 | queue = virtqueue_get_desc_addr(vq); |
558 | if (vcdev->revision == 0) { |
559 | info->info_block->l.queue = queue; |
560 | info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN; |
561 | info->info_block->l.index = i; |
562 | info->info_block->l.num = info->num; |
563 | ccw->count = sizeof(info->info_block->l); |
564 | } else { |
565 | info->info_block->s.desc = queue; |
566 | info->info_block->s.index = i; |
567 | info->info_block->s.num = info->num; |
568 | info->info_block->s.avail = (__u64)virtqueue_get_avail_addr(vq); |
569 | info->info_block->s.used = (__u64)virtqueue_get_used_addr(vq); |
570 | ccw->count = sizeof(info->info_block->s); |
571 | } |
572 | ccw->cmd_code = CCW_CMD_SET_VQ; |
573 | ccw->flags = 0; |
574 | ccw->cda = (__u32)virt_to_phys(address: info->info_block); |
575 | err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i); |
576 | if (err) { |
577 | dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n" ); |
578 | goto out_err; |
579 | } |
580 | |
581 | info->vq = vq; |
582 | vq->priv = info; |
583 | |
584 | /* Save it to our list. */ |
585 | spin_lock_irqsave(&vcdev->lock, flags); |
586 | list_add(new: &info->node, head: &vcdev->virtqueues); |
587 | spin_unlock_irqrestore(lock: &vcdev->lock, flags); |
588 | |
589 | return vq; |
590 | |
591 | out_err: |
592 | if (vq) |
593 | vring_del_virtqueue(vq); |
594 | if (info) { |
595 | ccw_device_dma_free(vcdev->cdev, info->info_block, |
596 | sizeof(*info->info_block)); |
597 | } |
598 | kfree(objp: info); |
599 | return ERR_PTR(error: err); |
600 | } |
601 | |
602 | static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev, |
603 | struct virtqueue *vqs[], int nvqs, |
604 | struct ccw1 *ccw) |
605 | { |
606 | int ret; |
607 | struct virtio_thinint_area *thinint_area = NULL; |
608 | unsigned long indicator_addr; |
609 | struct airq_info *info; |
610 | |
611 | thinint_area = ccw_device_dma_zalloc(vcdev->cdev, |
612 | sizeof(*thinint_area)); |
613 | if (!thinint_area) { |
614 | ret = -ENOMEM; |
615 | goto out; |
616 | } |
617 | /* Try to get an indicator. */ |
618 | indicator_addr = get_airq_indicator(vqs, nvqs, |
619 | first: &thinint_area->bit_nr, |
620 | airq_info: &vcdev->airq_info); |
621 | if (!indicator_addr) { |
622 | ret = -ENOSPC; |
623 | goto out; |
624 | } |
625 | thinint_area->indicator = virt_to_phys(address: (void *)indicator_addr); |
626 | info = vcdev->airq_info; |
627 | thinint_area->summary_indicator = |
628 | virt_to_phys(address: get_summary_indicator(info)); |
629 | thinint_area->isc = VIRTIO_AIRQ_ISC; |
630 | ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; |
631 | ccw->flags = CCW_FLAG_SLI; |
632 | ccw->count = sizeof(*thinint_area); |
633 | ccw->cda = (__u32)virt_to_phys(address: thinint_area); |
634 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER); |
635 | if (ret) { |
636 | if (ret == -EOPNOTSUPP) { |
637 | /* |
638 | * The host does not support adapter interrupts |
639 | * for virtio-ccw, stop trying. |
640 | */ |
641 | virtio_ccw_use_airq = 0; |
642 | pr_info("Adapter interrupts unsupported on host\n" ); |
643 | } else |
644 | dev_warn(&vcdev->cdev->dev, |
645 | "enabling adapter interrupts = %d\n" , ret); |
646 | virtio_ccw_drop_indicators(vcdev); |
647 | } |
648 | out: |
649 | ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area)); |
650 | return ret; |
651 | } |
652 | |
653 | static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, |
654 | struct virtqueue *vqs[], |
655 | vq_callback_t *callbacks[], |
656 | const char * const names[], |
657 | const bool *ctx, |
658 | struct irq_affinity *desc) |
659 | { |
660 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
661 | unsigned long *indicatorp = NULL; |
662 | int ret, i, queue_idx = 0; |
663 | struct ccw1 *ccw; |
664 | |
665 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
666 | if (!ccw) |
667 | return -ENOMEM; |
668 | |
669 | for (i = 0; i < nvqs; ++i) { |
670 | if (!names[i]) { |
671 | vqs[i] = NULL; |
672 | continue; |
673 | } |
674 | |
675 | vqs[i] = virtio_ccw_setup_vq(vdev, i: queue_idx++, callback: callbacks[i], |
676 | name: names[i], ctx: ctx ? ctx[i] : false, |
677 | ccw); |
678 | if (IS_ERR(ptr: vqs[i])) { |
679 | ret = PTR_ERR(ptr: vqs[i]); |
680 | vqs[i] = NULL; |
681 | goto out; |
682 | } |
683 | } |
684 | ret = -ENOMEM; |
685 | /* |
686 | * We need a data area under 2G to communicate. Our payload is |
687 | * the address of the indicators. |
688 | */ |
689 | indicatorp = ccw_device_dma_zalloc(vcdev->cdev, |
690 | sizeof(indicators(vcdev))); |
691 | if (!indicatorp) |
692 | goto out; |
693 | *indicatorp = (unsigned long) indicators(vcdev); |
694 | if (vcdev->is_thinint) { |
695 | ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); |
696 | if (ret) |
697 | /* no error, just fall back to legacy interrupts */ |
698 | vcdev->is_thinint = false; |
699 | } |
700 | if (!vcdev->is_thinint) { |
701 | /* Register queue indicators with host. */ |
702 | *indicators(vcdev) = 0; |
703 | ccw->cmd_code = CCW_CMD_SET_IND; |
704 | ccw->flags = 0; |
705 | ccw->count = sizeof(indicators(vcdev)); |
706 | ccw->cda = (__u32)virt_to_phys(address: indicatorp); |
707 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); |
708 | if (ret) |
709 | goto out; |
710 | } |
711 | /* Register indicators2 with host for config changes */ |
712 | *indicatorp = (unsigned long) indicators2(vcdev); |
713 | *indicators2(vcdev) = 0; |
714 | ccw->cmd_code = CCW_CMD_SET_CONF_IND; |
715 | ccw->flags = 0; |
716 | ccw->count = sizeof(indicators2(vcdev)); |
717 | ccw->cda = (__u32)virt_to_phys(address: indicatorp); |
718 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); |
719 | if (ret) |
720 | goto out; |
721 | |
722 | if (indicatorp) |
723 | ccw_device_dma_free(vcdev->cdev, indicatorp, |
724 | sizeof(indicators(vcdev))); |
725 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
726 | return 0; |
727 | out: |
728 | if (indicatorp) |
729 | ccw_device_dma_free(vcdev->cdev, indicatorp, |
730 | sizeof(indicators(vcdev))); |
731 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
732 | virtio_ccw_del_vqs(vdev); |
733 | return ret; |
734 | } |
735 | |
736 | static void virtio_ccw_reset(struct virtio_device *vdev) |
737 | { |
738 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
739 | struct ccw1 *ccw; |
740 | |
741 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
742 | if (!ccw) |
743 | return; |
744 | |
745 | /* Zero status bits. */ |
746 | vcdev->dma_area->status = 0; |
747 | |
748 | /* Send a reset ccw on device. */ |
749 | ccw->cmd_code = CCW_CMD_VDEV_RESET; |
750 | ccw->flags = 0; |
751 | ccw->count = 0; |
752 | ccw->cda = 0; |
753 | ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); |
754 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
755 | } |
756 | |
757 | static u64 virtio_ccw_get_features(struct virtio_device *vdev) |
758 | { |
759 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
760 | struct virtio_feature_desc *features; |
761 | int ret; |
762 | u64 rc; |
763 | struct ccw1 *ccw; |
764 | |
765 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
766 | if (!ccw) |
767 | return 0; |
768 | |
769 | features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features)); |
770 | if (!features) { |
771 | rc = 0; |
772 | goto out_free; |
773 | } |
774 | /* Read the feature bits from the host. */ |
775 | features->index = 0; |
776 | ccw->cmd_code = CCW_CMD_READ_FEAT; |
777 | ccw->flags = 0; |
778 | ccw->count = sizeof(*features); |
779 | ccw->cda = (__u32)virt_to_phys(address: features); |
780 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); |
781 | if (ret) { |
782 | rc = 0; |
783 | goto out_free; |
784 | } |
785 | |
786 | rc = le32_to_cpu(features->features); |
787 | |
788 | if (vcdev->revision == 0) |
789 | goto out_free; |
790 | |
791 | /* Read second half of the feature bits from the host. */ |
792 | features->index = 1; |
793 | ccw->cmd_code = CCW_CMD_READ_FEAT; |
794 | ccw->flags = 0; |
795 | ccw->count = sizeof(*features); |
796 | ccw->cda = (__u32)virt_to_phys(address: features); |
797 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); |
798 | if (ret == 0) |
799 | rc |= (u64)le32_to_cpu(features->features) << 32; |
800 | |
801 | out_free: |
802 | ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); |
803 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
804 | return rc; |
805 | } |
806 | |
807 | static void ccw_transport_features(struct virtio_device *vdev) |
808 | { |
809 | /* |
810 | * Currently nothing to do here. |
811 | */ |
812 | } |
813 | |
814 | static int virtio_ccw_finalize_features(struct virtio_device *vdev) |
815 | { |
816 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
817 | struct virtio_feature_desc *features; |
818 | struct ccw1 *ccw; |
819 | int ret; |
820 | |
821 | if (vcdev->revision >= 1 && |
822 | !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { |
823 | dev_err(&vdev->dev, "virtio: device uses revision 1 " |
824 | "but does not have VIRTIO_F_VERSION_1\n" ); |
825 | return -EINVAL; |
826 | } |
827 | |
828 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
829 | if (!ccw) |
830 | return -ENOMEM; |
831 | |
832 | features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features)); |
833 | if (!features) { |
834 | ret = -ENOMEM; |
835 | goto out_free; |
836 | } |
837 | /* Give virtio_ring a chance to accept features. */ |
838 | vring_transport_features(vdev); |
839 | |
840 | /* Give virtio_ccw a chance to accept features. */ |
841 | ccw_transport_features(vdev); |
842 | |
843 | features->index = 0; |
844 | features->features = cpu_to_le32((u32)vdev->features); |
845 | /* Write the first half of the feature bits to the host. */ |
846 | ccw->cmd_code = CCW_CMD_WRITE_FEAT; |
847 | ccw->flags = 0; |
848 | ccw->count = sizeof(*features); |
849 | ccw->cda = (__u32)virt_to_phys(address: features); |
850 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); |
851 | if (ret) |
852 | goto out_free; |
853 | |
854 | if (vcdev->revision == 0) |
855 | goto out_free; |
856 | |
857 | features->index = 1; |
858 | features->features = cpu_to_le32(vdev->features >> 32); |
859 | /* Write the second half of the feature bits to the host. */ |
860 | ccw->cmd_code = CCW_CMD_WRITE_FEAT; |
861 | ccw->flags = 0; |
862 | ccw->count = sizeof(*features); |
863 | ccw->cda = (__u32)virt_to_phys(address: features); |
864 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); |
865 | |
866 | out_free: |
867 | ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); |
868 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
869 | |
870 | return ret; |
871 | } |
872 | |
873 | static void virtio_ccw_get_config(struct virtio_device *vdev, |
874 | unsigned int offset, void *buf, unsigned len) |
875 | { |
876 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
877 | int ret; |
878 | struct ccw1 *ccw; |
879 | void *config_area; |
880 | unsigned long flags; |
881 | |
882 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
883 | if (!ccw) |
884 | return; |
885 | |
886 | config_area = ccw_device_dma_zalloc(vcdev->cdev, |
887 | VIRTIO_CCW_CONFIG_SIZE); |
888 | if (!config_area) |
889 | goto out_free; |
890 | |
891 | /* Read the config area from the host. */ |
892 | ccw->cmd_code = CCW_CMD_READ_CONF; |
893 | ccw->flags = 0; |
894 | ccw->count = offset + len; |
895 | ccw->cda = (__u32)virt_to_phys(address: config_area); |
896 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); |
897 | if (ret) |
898 | goto out_free; |
899 | |
900 | spin_lock_irqsave(&vcdev->lock, flags); |
901 | memcpy(vcdev->config, config_area, offset + len); |
902 | if (vcdev->config_ready < offset + len) |
903 | vcdev->config_ready = offset + len; |
904 | spin_unlock_irqrestore(lock: &vcdev->lock, flags); |
905 | if (buf) |
906 | memcpy(buf, config_area + offset, len); |
907 | |
908 | out_free: |
909 | ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); |
910 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
911 | } |
912 | |
913 | static void virtio_ccw_set_config(struct virtio_device *vdev, |
914 | unsigned int offset, const void *buf, |
915 | unsigned len) |
916 | { |
917 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
918 | struct ccw1 *ccw; |
919 | void *config_area; |
920 | unsigned long flags; |
921 | |
922 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
923 | if (!ccw) |
924 | return; |
925 | |
926 | config_area = ccw_device_dma_zalloc(vcdev->cdev, |
927 | VIRTIO_CCW_CONFIG_SIZE); |
928 | if (!config_area) |
929 | goto out_free; |
930 | |
931 | /* Make sure we don't overwrite fields. */ |
932 | if (vcdev->config_ready < offset) |
933 | virtio_ccw_get_config(vdev, offset: 0, NULL, len: offset); |
934 | spin_lock_irqsave(&vcdev->lock, flags); |
935 | memcpy(&vcdev->config[offset], buf, len); |
936 | /* Write the config area to the host. */ |
937 | memcpy(config_area, vcdev->config, sizeof(vcdev->config)); |
938 | spin_unlock_irqrestore(lock: &vcdev->lock, flags); |
939 | ccw->cmd_code = CCW_CMD_WRITE_CONF; |
940 | ccw->flags = 0; |
941 | ccw->count = offset + len; |
942 | ccw->cda = (__u32)virt_to_phys(address: config_area); |
943 | ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); |
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 u8 virtio_ccw_get_status(struct virtio_device *vdev) |
951 | { |
952 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
953 | u8 old_status = vcdev->dma_area->status; |
954 | struct ccw1 *ccw; |
955 | |
956 | if (vcdev->revision < 2) |
957 | return vcdev->dma_area->status; |
958 | |
959 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
960 | if (!ccw) |
961 | return old_status; |
962 | |
963 | ccw->cmd_code = CCW_CMD_READ_STATUS; |
964 | ccw->flags = 0; |
965 | ccw->count = sizeof(vcdev->dma_area->status); |
966 | ccw->cda = (__u32)virt_to_phys(address: &vcdev->dma_area->status); |
967 | ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS); |
968 | /* |
969 | * If the channel program failed (should only happen if the device |
970 | * was hotunplugged, and then we clean up via the machine check |
971 | * handler anyway), vcdev->dma_area->status was not overwritten and we just |
972 | * return the old status, which is fine. |
973 | */ |
974 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
975 | |
976 | return vcdev->dma_area->status; |
977 | } |
978 | |
979 | static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) |
980 | { |
981 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
982 | u8 old_status = vcdev->dma_area->status; |
983 | struct ccw1 *ccw; |
984 | int ret; |
985 | |
986 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
987 | if (!ccw) |
988 | return; |
989 | |
990 | /* Write the status to the host. */ |
991 | vcdev->dma_area->status = status; |
992 | ccw->cmd_code = CCW_CMD_WRITE_STATUS; |
993 | ccw->flags = 0; |
994 | ccw->count = sizeof(status); |
995 | ccw->cda = (__u32)virt_to_phys(address: &vcdev->dma_area->status); |
996 | /* We use ssch for setting the status which is a serializing |
997 | * instruction that guarantees the memory writes have |
998 | * completed before ssch. |
999 | */ |
1000 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); |
1001 | /* Write failed? We assume status is unchanged. */ |
1002 | if (ret) |
1003 | vcdev->dma_area->status = old_status; |
1004 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
1005 | } |
1006 | |
1007 | static const char *virtio_ccw_bus_name(struct virtio_device *vdev) |
1008 | { |
1009 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
1010 | |
1011 | return dev_name(dev: &vcdev->cdev->dev); |
1012 | } |
1013 | |
1014 | static void virtio_ccw_synchronize_cbs(struct virtio_device *vdev) |
1015 | { |
1016 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
1017 | struct airq_info *info = vcdev->airq_info; |
1018 | |
1019 | if (info) { |
1020 | /* |
1021 | * This device uses adapter interrupts: synchronize with |
1022 | * vring_interrupt() called by virtio_airq_handler() |
1023 | * via the indicator area lock. |
1024 | */ |
1025 | write_lock_irq(&info->lock); |
1026 | write_unlock_irq(&info->lock); |
1027 | } else { |
1028 | /* This device uses classic interrupts: synchronize |
1029 | * with vring_interrupt() called by |
1030 | * virtio_ccw_int_handler() via the per-device |
1031 | * irq_lock |
1032 | */ |
1033 | write_lock_irq(&vcdev->irq_lock); |
1034 | write_unlock_irq(&vcdev->irq_lock); |
1035 | } |
1036 | } |
1037 | |
1038 | static const struct virtio_config_ops virtio_ccw_config_ops = { |
1039 | .get_features = virtio_ccw_get_features, |
1040 | .finalize_features = virtio_ccw_finalize_features, |
1041 | .get = virtio_ccw_get_config, |
1042 | .set = virtio_ccw_set_config, |
1043 | .get_status = virtio_ccw_get_status, |
1044 | .set_status = virtio_ccw_set_status, |
1045 | .reset = virtio_ccw_reset, |
1046 | .find_vqs = virtio_ccw_find_vqs, |
1047 | .del_vqs = virtio_ccw_del_vqs, |
1048 | .bus_name = virtio_ccw_bus_name, |
1049 | .synchronize_cbs = virtio_ccw_synchronize_cbs, |
1050 | }; |
1051 | |
1052 | |
1053 | /* |
1054 | * ccw bus driver related functions |
1055 | */ |
1056 | |
1057 | static void virtio_ccw_release_dev(struct device *_d) |
1058 | { |
1059 | struct virtio_device *dev = dev_to_virtio(_d); |
1060 | struct virtio_ccw_device *vcdev = to_vc_device(vdev: dev); |
1061 | |
1062 | ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, |
1063 | sizeof(*vcdev->dma_area)); |
1064 | kfree(objp: vcdev); |
1065 | } |
1066 | |
1067 | static int irb_is_error(struct irb *irb) |
1068 | { |
1069 | if (scsw_cstat(&irb->scsw) != 0) |
1070 | return 1; |
1071 | if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) |
1072 | return 1; |
1073 | if (scsw_cc(&irb->scsw) != 0) |
1074 | return 1; |
1075 | return 0; |
1076 | } |
1077 | |
1078 | static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, |
1079 | int index) |
1080 | { |
1081 | struct virtio_ccw_vq_info *info; |
1082 | unsigned long flags; |
1083 | struct virtqueue *vq; |
1084 | |
1085 | vq = NULL; |
1086 | spin_lock_irqsave(&vcdev->lock, flags); |
1087 | list_for_each_entry(info, &vcdev->virtqueues, node) { |
1088 | if (info->vq->index == index) { |
1089 | vq = info->vq; |
1090 | break; |
1091 | } |
1092 | } |
1093 | spin_unlock_irqrestore(lock: &vcdev->lock, flags); |
1094 | return vq; |
1095 | } |
1096 | |
1097 | static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, |
1098 | __u32 activity) |
1099 | { |
1100 | if (vcdev->curr_io & activity) { |
1101 | switch (activity) { |
1102 | case VIRTIO_CCW_DOING_READ_FEAT: |
1103 | case VIRTIO_CCW_DOING_WRITE_FEAT: |
1104 | case VIRTIO_CCW_DOING_READ_CONFIG: |
1105 | case VIRTIO_CCW_DOING_WRITE_CONFIG: |
1106 | case VIRTIO_CCW_DOING_WRITE_STATUS: |
1107 | case VIRTIO_CCW_DOING_READ_STATUS: |
1108 | case VIRTIO_CCW_DOING_SET_VQ: |
1109 | case VIRTIO_CCW_DOING_SET_IND: |
1110 | case VIRTIO_CCW_DOING_SET_CONF_IND: |
1111 | case VIRTIO_CCW_DOING_RESET: |
1112 | case VIRTIO_CCW_DOING_READ_VQ_CONF: |
1113 | case VIRTIO_CCW_DOING_SET_IND_ADAPTER: |
1114 | case VIRTIO_CCW_DOING_SET_VIRTIO_REV: |
1115 | vcdev->curr_io &= ~activity; |
1116 | wake_up(&vcdev->wait_q); |
1117 | break; |
1118 | default: |
1119 | /* don't know what to do... */ |
1120 | dev_warn(&vcdev->cdev->dev, |
1121 | "Suspicious activity '%08x'\n" , activity); |
1122 | WARN_ON(1); |
1123 | break; |
1124 | } |
1125 | } |
1126 | } |
1127 | |
1128 | static void virtio_ccw_int_handler(struct ccw_device *cdev, |
1129 | unsigned long intparm, |
1130 | struct irb *irb) |
1131 | { |
1132 | __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; |
1133 | struct virtio_ccw_device *vcdev = dev_get_drvdata(dev: &cdev->dev); |
1134 | int i; |
1135 | struct virtqueue *vq; |
1136 | |
1137 | if (!vcdev) |
1138 | return; |
1139 | if (IS_ERR(ptr: irb)) { |
1140 | vcdev->err = PTR_ERR(ptr: irb); |
1141 | virtio_ccw_check_activity(vcdev, activity); |
1142 | /* Don't poke around indicators, something's wrong. */ |
1143 | return; |
1144 | } |
1145 | /* Check if it's a notification from the host. */ |
1146 | if ((intparm == 0) && |
1147 | (scsw_stctl(&irb->scsw) == |
1148 | (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { |
1149 | /* OK */ |
1150 | } |
1151 | if (irb_is_error(irb)) { |
1152 | /* Command reject? */ |
1153 | if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && |
1154 | (irb->ecw[0] & SNS0_CMD_REJECT)) |
1155 | vcdev->err = -EOPNOTSUPP; |
1156 | else |
1157 | /* Map everything else to -EIO. */ |
1158 | vcdev->err = -EIO; |
1159 | } |
1160 | virtio_ccw_check_activity(vcdev, activity); |
1161 | #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION |
1162 | /* |
1163 | * Paired with virtio_ccw_synchronize_cbs() and interrupts are |
1164 | * disabled here. |
1165 | */ |
1166 | read_lock(&vcdev->irq_lock); |
1167 | #endif |
1168 | for_each_set_bit(i, indicators(vcdev), |
1169 | sizeof(*indicators(vcdev)) * BITS_PER_BYTE) { |
1170 | /* The bit clear must happen before the vring kick. */ |
1171 | clear_bit(nr: i, addr: indicators(vcdev)); |
1172 | barrier(); |
1173 | vq = virtio_ccw_vq_by_ind(vcdev, index: i); |
1174 | vring_interrupt(irq: 0, vq: vq); |
1175 | } |
1176 | #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION |
1177 | read_unlock(&vcdev->irq_lock); |
1178 | #endif |
1179 | if (test_bit(0, indicators2(vcdev))) { |
1180 | virtio_config_changed(dev: &vcdev->vdev); |
1181 | clear_bit(nr: 0, addr: indicators2(vcdev)); |
1182 | } |
1183 | } |
1184 | |
1185 | /* |
1186 | * We usually want to autoonline all devices, but give the admin |
1187 | * a way to exempt devices from this. |
1188 | */ |
1189 | #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ |
1190 | (8*sizeof(long))) |
1191 | static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; |
1192 | |
1193 | static char *no_auto = "" ; |
1194 | |
1195 | module_param(no_auto, charp, 0444); |
1196 | MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined" ); |
1197 | |
1198 | static int virtio_ccw_check_autoonline(struct ccw_device *cdev) |
1199 | { |
1200 | struct ccw_dev_id id; |
1201 | |
1202 | ccw_device_get_id(cdev, &id); |
1203 | if (test_bit(id.devno, devs_no_auto[id.ssid])) |
1204 | return 0; |
1205 | return 1; |
1206 | } |
1207 | |
1208 | static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) |
1209 | { |
1210 | struct ccw_device *cdev = data; |
1211 | int ret; |
1212 | |
1213 | ret = ccw_device_set_online(cdev); |
1214 | if (ret) |
1215 | dev_warn(&cdev->dev, "Failed to set online: %d\n" , ret); |
1216 | } |
1217 | |
1218 | static int virtio_ccw_probe(struct ccw_device *cdev) |
1219 | { |
1220 | cdev->handler = virtio_ccw_int_handler; |
1221 | |
1222 | if (virtio_ccw_check_autoonline(cdev)) |
1223 | async_schedule(func: virtio_ccw_auto_online, data: cdev); |
1224 | return 0; |
1225 | } |
1226 | |
1227 | static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) |
1228 | { |
1229 | unsigned long flags; |
1230 | struct virtio_ccw_device *vcdev; |
1231 | |
1232 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
1233 | vcdev = dev_get_drvdata(dev: &cdev->dev); |
1234 | if (!vcdev || vcdev->going_away) { |
1235 | spin_unlock_irqrestore(lock: get_ccwdev_lock(cdev), flags); |
1236 | return NULL; |
1237 | } |
1238 | vcdev->going_away = true; |
1239 | spin_unlock_irqrestore(lock: get_ccwdev_lock(cdev), flags); |
1240 | return vcdev; |
1241 | } |
1242 | |
1243 | static void virtio_ccw_remove(struct ccw_device *cdev) |
1244 | { |
1245 | unsigned long flags; |
1246 | struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); |
1247 | |
1248 | if (vcdev && cdev->online) { |
1249 | if (vcdev->device_lost) |
1250 | virtio_break_device(dev: &vcdev->vdev); |
1251 | unregister_virtio_device(dev: &vcdev->vdev); |
1252 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
1253 | dev_set_drvdata(dev: &cdev->dev, NULL); |
1254 | spin_unlock_irqrestore(lock: get_ccwdev_lock(cdev), flags); |
1255 | } |
1256 | cdev->handler = NULL; |
1257 | } |
1258 | |
1259 | static int virtio_ccw_offline(struct ccw_device *cdev) |
1260 | { |
1261 | unsigned long flags; |
1262 | struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); |
1263 | |
1264 | if (!vcdev) |
1265 | return 0; |
1266 | if (vcdev->device_lost) |
1267 | virtio_break_device(dev: &vcdev->vdev); |
1268 | unregister_virtio_device(dev: &vcdev->vdev); |
1269 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
1270 | dev_set_drvdata(dev: &cdev->dev, NULL); |
1271 | spin_unlock_irqrestore(lock: get_ccwdev_lock(cdev), flags); |
1272 | return 0; |
1273 | } |
1274 | |
1275 | static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) |
1276 | { |
1277 | struct virtio_rev_info *rev; |
1278 | struct ccw1 *ccw; |
1279 | int ret; |
1280 | |
1281 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
1282 | if (!ccw) |
1283 | return -ENOMEM; |
1284 | rev = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*rev)); |
1285 | if (!rev) { |
1286 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
1287 | return -ENOMEM; |
1288 | } |
1289 | |
1290 | /* Set transport revision */ |
1291 | ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; |
1292 | ccw->flags = 0; |
1293 | ccw->count = sizeof(*rev); |
1294 | ccw->cda = (__u32)virt_to_phys(address: rev); |
1295 | |
1296 | vcdev->revision = VIRTIO_CCW_REV_MAX; |
1297 | do { |
1298 | rev->revision = vcdev->revision; |
1299 | /* none of our supported revisions carry payload */ |
1300 | rev->length = 0; |
1301 | ret = ccw_io_helper(vcdev, ccw, |
1302 | VIRTIO_CCW_DOING_SET_VIRTIO_REV); |
1303 | if (ret == -EOPNOTSUPP) { |
1304 | if (vcdev->revision == 0) |
1305 | /* |
1306 | * The host device does not support setting |
1307 | * the revision: let's operate it in legacy |
1308 | * mode. |
1309 | */ |
1310 | ret = 0; |
1311 | else |
1312 | vcdev->revision--; |
1313 | } |
1314 | } while (ret == -EOPNOTSUPP); |
1315 | |
1316 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
1317 | ccw_device_dma_free(vcdev->cdev, rev, sizeof(*rev)); |
1318 | return ret; |
1319 | } |
1320 | |
1321 | static int virtio_ccw_online(struct ccw_device *cdev) |
1322 | { |
1323 | int ret; |
1324 | struct virtio_ccw_device *vcdev; |
1325 | unsigned long flags; |
1326 | |
1327 | vcdev = kzalloc(size: sizeof(*vcdev), GFP_KERNEL); |
1328 | if (!vcdev) { |
1329 | dev_warn(&cdev->dev, "Could not get memory for virtio\n" ); |
1330 | ret = -ENOMEM; |
1331 | goto out_free; |
1332 | } |
1333 | vcdev->vdev.dev.parent = &cdev->dev; |
1334 | vcdev->cdev = cdev; |
1335 | vcdev->dma_area = ccw_device_dma_zalloc(vcdev->cdev, |
1336 | sizeof(*vcdev->dma_area)); |
1337 | if (!vcdev->dma_area) { |
1338 | ret = -ENOMEM; |
1339 | goto out_free; |
1340 | } |
1341 | |
1342 | vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ |
1343 | |
1344 | vcdev->vdev.dev.release = virtio_ccw_release_dev; |
1345 | vcdev->vdev.config = &virtio_ccw_config_ops; |
1346 | init_waitqueue_head(&vcdev->wait_q); |
1347 | INIT_LIST_HEAD(list: &vcdev->virtqueues); |
1348 | spin_lock_init(&vcdev->lock); |
1349 | rwlock_init(&vcdev->irq_lock); |
1350 | mutex_init(&vcdev->io_lock); |
1351 | |
1352 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
1353 | dev_set_drvdata(dev: &cdev->dev, data: vcdev); |
1354 | spin_unlock_irqrestore(lock: get_ccwdev_lock(cdev), flags); |
1355 | vcdev->vdev.id.vendor = cdev->id.cu_type; |
1356 | vcdev->vdev.id.device = cdev->id.cu_model; |
1357 | |
1358 | ret = virtio_ccw_set_transport_rev(vcdev); |
1359 | if (ret) |
1360 | goto out_free; |
1361 | |
1362 | ret = register_virtio_device(dev: &vcdev->vdev); |
1363 | if (ret) { |
1364 | dev_warn(&cdev->dev, "Failed to register virtio device: %d\n" , |
1365 | ret); |
1366 | goto out_put; |
1367 | } |
1368 | return 0; |
1369 | out_put: |
1370 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
1371 | dev_set_drvdata(dev: &cdev->dev, NULL); |
1372 | spin_unlock_irqrestore(lock: get_ccwdev_lock(cdev), flags); |
1373 | put_device(dev: &vcdev->vdev.dev); |
1374 | return ret; |
1375 | out_free: |
1376 | if (vcdev) { |
1377 | ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, |
1378 | sizeof(*vcdev->dma_area)); |
1379 | } |
1380 | kfree(objp: vcdev); |
1381 | return ret; |
1382 | } |
1383 | |
1384 | static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) |
1385 | { |
1386 | int rc; |
1387 | struct virtio_ccw_device *vcdev = dev_get_drvdata(dev: &cdev->dev); |
1388 | |
1389 | /* |
1390 | * Make sure vcdev is set |
1391 | * i.e. set_offline/remove callback not already running |
1392 | */ |
1393 | if (!vcdev) |
1394 | return NOTIFY_DONE; |
1395 | |
1396 | switch (event) { |
1397 | case CIO_GONE: |
1398 | vcdev->device_lost = true; |
1399 | rc = NOTIFY_DONE; |
1400 | break; |
1401 | case CIO_OPER: |
1402 | rc = NOTIFY_OK; |
1403 | break; |
1404 | default: |
1405 | rc = NOTIFY_DONE; |
1406 | break; |
1407 | } |
1408 | return rc; |
1409 | } |
1410 | |
1411 | static struct ccw_device_id virtio_ids[] = { |
1412 | { CCW_DEVICE(0x3832, 0) }, |
1413 | {}, |
1414 | }; |
1415 | |
1416 | static struct ccw_driver virtio_ccw_driver = { |
1417 | .driver = { |
1418 | .owner = THIS_MODULE, |
1419 | .name = "virtio_ccw" , |
1420 | }, |
1421 | .ids = virtio_ids, |
1422 | .probe = virtio_ccw_probe, |
1423 | .remove = virtio_ccw_remove, |
1424 | .set_offline = virtio_ccw_offline, |
1425 | .set_online = virtio_ccw_online, |
1426 | .notify = virtio_ccw_cio_notify, |
1427 | .int_class = IRQIO_VIR, |
1428 | }; |
1429 | |
1430 | static int __init pure_hex(char **cp, unsigned int *val, int min_digit, |
1431 | int max_digit, int max_val) |
1432 | { |
1433 | int diff; |
1434 | |
1435 | diff = 0; |
1436 | *val = 0; |
1437 | |
1438 | while (diff <= max_digit) { |
1439 | int value = hex_to_bin(ch: **cp); |
1440 | |
1441 | if (value < 0) |
1442 | break; |
1443 | *val = *val * 16 + value; |
1444 | (*cp)++; |
1445 | diff++; |
1446 | } |
1447 | |
1448 | if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) |
1449 | return 1; |
1450 | |
1451 | return 0; |
1452 | } |
1453 | |
1454 | static int __init parse_busid(char *str, unsigned int *cssid, |
1455 | unsigned int *ssid, unsigned int *devno) |
1456 | { |
1457 | char *str_work; |
1458 | int rc, ret; |
1459 | |
1460 | rc = 1; |
1461 | |
1462 | if (*str == '\0') |
1463 | goto out; |
1464 | |
1465 | str_work = str; |
1466 | ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); |
1467 | if (ret || (str_work[0] != '.')) |
1468 | goto out; |
1469 | str_work++; |
1470 | ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); |
1471 | if (ret || (str_work[0] != '.')) |
1472 | goto out; |
1473 | str_work++; |
1474 | ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); |
1475 | if (ret || (str_work[0] != '\0')) |
1476 | goto out; |
1477 | |
1478 | rc = 0; |
1479 | out: |
1480 | return rc; |
1481 | } |
1482 | |
1483 | static void __init no_auto_parse(void) |
1484 | { |
1485 | unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; |
1486 | char *parm, *str; |
1487 | int rc; |
1488 | |
1489 | str = no_auto; |
1490 | while ((parm = strsep(&str, "," ))) { |
1491 | rc = parse_busid(str: strsep(&parm, "-" ), cssid: &from_cssid, |
1492 | ssid: &from_ssid, devno: &from); |
1493 | if (rc) |
1494 | continue; |
1495 | if (parm != NULL) { |
1496 | rc = parse_busid(str: parm, cssid: &to_cssid, |
1497 | ssid: &to_ssid, devno: &to); |
1498 | if ((from_ssid > to_ssid) || |
1499 | ((from_ssid == to_ssid) && (from > to))) |
1500 | rc = -EINVAL; |
1501 | } else { |
1502 | to_cssid = from_cssid; |
1503 | to_ssid = from_ssid; |
1504 | to = from; |
1505 | } |
1506 | if (rc) |
1507 | continue; |
1508 | while ((from_ssid < to_ssid) || |
1509 | ((from_ssid == to_ssid) && (from <= to))) { |
1510 | set_bit(nr: from, addr: devs_no_auto[from_ssid]); |
1511 | from++; |
1512 | if (from > __MAX_SUBCHANNEL) { |
1513 | from_ssid++; |
1514 | from = 0; |
1515 | } |
1516 | } |
1517 | } |
1518 | } |
1519 | |
1520 | static int __init virtio_ccw_init(void) |
1521 | { |
1522 | int rc; |
1523 | |
1524 | /* parse no_auto string before we do anything further */ |
1525 | no_auto_parse(); |
1526 | |
1527 | summary_indicators = cio_dma_zalloc(MAX_AIRQ_AREAS); |
1528 | if (!summary_indicators) |
1529 | return -ENOMEM; |
1530 | rc = ccw_driver_register(&virtio_ccw_driver); |
1531 | if (rc) |
1532 | cio_dma_free(summary_indicators, MAX_AIRQ_AREAS); |
1533 | return rc; |
1534 | } |
1535 | device_initcall(virtio_ccw_init); |
1536 | |