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31fb1673 | 1 | // SPDX-License-Identifier: GPL-2.0 |
7e64e059 CH |
2 | /* |
3 | * ccw based virtio transport | |
4 | * | |
96b14536 | 5 | * Copyright IBM Corp. 2012, 2014 |
7e64e059 | 6 | * |
7e64e059 CH |
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/bootmem.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> | |
acc50ec7 | 24 | #include <linux/moduleparam.h> |
7e64e059 CH |
25 | #include <linux/io.h> |
26 | #include <linux/kvm_para.h> | |
e75279c4 | 27 | #include <linux/notifier.h> |
1ec2772e | 28 | #include <asm/diag.h> |
7e64e059 CH |
29 | #include <asm/setup.h> |
30 | #include <asm/irq.h> | |
31 | #include <asm/cio.h> | |
32 | #include <asm/ccwdev.h> | |
6a773cb8 | 33 | #include <asm/virtio-ccw.h> |
96b14536 CH |
34 | #include <asm/isc.h> |
35 | #include <asm/airq.h> | |
7e64e059 CH |
36 | |
37 | /* | |
38 | * virtio related functions | |
39 | */ | |
40 | ||
41 | struct vq_config_block { | |
42 | __u16 index; | |
43 | __u16 num; | |
44 | } __packed; | |
45 | ||
46 | #define VIRTIO_CCW_CONFIG_SIZE 0x100 | |
47 | /* same as PCI config space size, should be enough for all drivers */ | |
48 | ||
49 | struct virtio_ccw_device { | |
50 | struct virtio_device vdev; | |
73fa21ea | 51 | __u8 *status; |
7e64e059 CH |
52 | __u8 config[VIRTIO_CCW_CONFIG_SIZE]; |
53 | struct ccw_device *cdev; | |
7e64e059 CH |
54 | __u32 curr_io; |
55 | int err; | |
6bb2c835 | 56 | unsigned int revision; /* Transport revision */ |
7e64e059 CH |
57 | wait_queue_head_t wait_q; |
58 | spinlock_t lock; | |
59 | struct list_head virtqueues; | |
60 | unsigned long indicators; | |
61 | unsigned long indicators2; | |
62 | struct vq_config_block *config_block; | |
96b14536 | 63 | bool is_thinint; |
79629b20 | 64 | bool going_away; |
e75279c4 | 65 | bool device_lost; |
431dae77 | 66 | unsigned int config_ready; |
96b14536 | 67 | void *airq_info; |
7e64e059 CH |
68 | }; |
69 | ||
d4674240 | 70 | struct vq_info_block_legacy { |
7e64e059 CH |
71 | __u64 queue; |
72 | __u32 align; | |
73 | __u16 index; | |
74 | __u16 num; | |
75 | } __packed; | |
76 | ||
d4674240 CH |
77 | struct vq_info_block { |
78 | __u64 desc; | |
79 | __u32 res0; | |
80 | __u16 index; | |
81 | __u16 num; | |
82 | __u64 avail; | |
83 | __u64 used; | |
84 | } __packed; | |
85 | ||
7e64e059 | 86 | struct virtio_feature_desc { |
fb317002 | 87 | __le32 features; |
7e64e059 CH |
88 | __u8 index; |
89 | } __packed; | |
90 | ||
96b14536 CH |
91 | struct virtio_thinint_area { |
92 | unsigned long summary_indicator; | |
93 | unsigned long indicator; | |
94 | u64 bit_nr; | |
95 | u8 isc; | |
96 | } __packed; | |
97 | ||
6bb2c835 TH |
98 | struct virtio_rev_info { |
99 | __u16 revision; | |
100 | __u16 length; | |
101 | __u8 data[]; | |
102 | }; | |
103 | ||
104 | /* the highest virtio-ccw revision we support */ | |
af9ca13b | 105 | #define VIRTIO_CCW_REV_MAX 1 |
6bb2c835 | 106 | |
7e64e059 CH |
107 | struct virtio_ccw_vq_info { |
108 | struct virtqueue *vq; | |
109 | int num; | |
110 | void *queue; | |
d4674240 CH |
111 | union { |
112 | struct vq_info_block s; | |
113 | struct vq_info_block_legacy l; | |
114 | } *info_block; | |
96b14536 | 115 | int bit_nr; |
7e64e059 | 116 | struct list_head node; |
07e16933 | 117 | long cookie; |
7e64e059 CH |
118 | }; |
119 | ||
96b14536 CH |
120 | #define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */ |
121 | ||
122 | #define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8) | |
123 | #define MAX_AIRQ_AREAS 20 | |
124 | ||
125 | static int virtio_ccw_use_airq = 1; | |
126 | ||
127 | struct airq_info { | |
128 | rwlock_t lock; | |
129 | u8 summary_indicator; | |
130 | struct airq_struct airq; | |
131 | struct airq_iv *aiv; | |
132 | }; | |
133 | static struct airq_info *airq_areas[MAX_AIRQ_AREAS]; | |
134 | ||
7e64e059 CH |
135 | #define CCW_CMD_SET_VQ 0x13 |
136 | #define CCW_CMD_VDEV_RESET 0x33 | |
137 | #define CCW_CMD_SET_IND 0x43 | |
138 | #define CCW_CMD_SET_CONF_IND 0x53 | |
139 | #define CCW_CMD_READ_FEAT 0x12 | |
140 | #define CCW_CMD_WRITE_FEAT 0x11 | |
141 | #define CCW_CMD_READ_CONF 0x22 | |
142 | #define CCW_CMD_WRITE_CONF 0x21 | |
143 | #define CCW_CMD_WRITE_STATUS 0x31 | |
144 | #define CCW_CMD_READ_VQ_CONF 0x32 | |
7d3ce5ab | 145 | #define CCW_CMD_READ_STATUS 0x72 |
96b14536 | 146 | #define CCW_CMD_SET_IND_ADAPTER 0x73 |
6bb2c835 | 147 | #define CCW_CMD_SET_VIRTIO_REV 0x83 |
7e64e059 CH |
148 | |
149 | #define VIRTIO_CCW_DOING_SET_VQ 0x00010000 | |
150 | #define VIRTIO_CCW_DOING_RESET 0x00040000 | |
151 | #define VIRTIO_CCW_DOING_READ_FEAT 0x00080000 | |
152 | #define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000 | |
153 | #define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000 | |
154 | #define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000 | |
155 | #define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000 | |
156 | #define VIRTIO_CCW_DOING_SET_IND 0x01000000 | |
157 | #define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000 | |
158 | #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000 | |
96b14536 | 159 | #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000 |
6bb2c835 | 160 | #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000 |
7d3ce5ab | 161 | #define VIRTIO_CCW_DOING_READ_STATUS 0x20000000 |
7e64e059 CH |
162 | #define VIRTIO_CCW_INTPARM_MASK 0xffff0000 |
163 | ||
164 | static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev) | |
165 | { | |
166 | return container_of(vdev, struct virtio_ccw_device, vdev); | |
167 | } | |
168 | ||
96b14536 CH |
169 | static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info) |
170 | { | |
171 | unsigned long i, flags; | |
172 | ||
173 | write_lock_irqsave(&info->lock, flags); | |
174 | for (i = 0; i < airq_iv_end(info->aiv); i++) { | |
175 | if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) { | |
176 | airq_iv_free_bit(info->aiv, i); | |
177 | airq_iv_set_ptr(info->aiv, i, 0); | |
178 | break; | |
179 | } | |
180 | } | |
181 | write_unlock_irqrestore(&info->lock, flags); | |
182 | } | |
183 | ||
184 | static void virtio_airq_handler(struct airq_struct *airq) | |
185 | { | |
186 | struct airq_info *info = container_of(airq, struct airq_info, airq); | |
187 | unsigned long ai; | |
188 | ||
189 | inc_irq_stat(IRQIO_VAI); | |
190 | read_lock(&info->lock); | |
191 | /* Walk through indicators field, summary indicator active. */ | |
192 | for (ai = 0;;) { | |
193 | ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); | |
194 | if (ai == -1UL) | |
195 | break; | |
196 | vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); | |
197 | } | |
198 | info->summary_indicator = 0; | |
199 | smp_wmb(); | |
200 | /* Walk through indicators field, summary indicator not active. */ | |
201 | for (ai = 0;;) { | |
202 | ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); | |
203 | if (ai == -1UL) | |
204 | break; | |
205 | vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); | |
206 | } | |
207 | read_unlock(&info->lock); | |
208 | } | |
209 | ||
210 | static struct airq_info *new_airq_info(void) | |
211 | { | |
212 | struct airq_info *info; | |
213 | int rc; | |
214 | ||
215 | info = kzalloc(sizeof(*info), GFP_KERNEL); | |
216 | if (!info) | |
217 | return NULL; | |
218 | rwlock_init(&info->lock); | |
219 | info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR); | |
220 | if (!info->aiv) { | |
221 | kfree(info); | |
222 | return NULL; | |
223 | } | |
224 | info->airq.handler = virtio_airq_handler; | |
225 | info->airq.lsi_ptr = &info->summary_indicator; | |
226 | info->airq.lsi_mask = 0xff; | |
227 | info->airq.isc = VIRTIO_AIRQ_ISC; | |
228 | rc = register_adapter_interrupt(&info->airq); | |
229 | if (rc) { | |
230 | airq_iv_release(info->aiv); | |
231 | kfree(info); | |
232 | return NULL; | |
233 | } | |
234 | return info; | |
235 | } | |
236 | ||
96b14536 CH |
237 | static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs, |
238 | u64 *first, void **airq_info) | |
239 | { | |
240 | int i, j; | |
241 | struct airq_info *info; | |
242 | unsigned long indicator_addr = 0; | |
243 | unsigned long bit, flags; | |
244 | ||
245 | for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) { | |
246 | if (!airq_areas[i]) | |
247 | airq_areas[i] = new_airq_info(); | |
248 | info = airq_areas[i]; | |
249 | if (!info) | |
250 | return 0; | |
251 | write_lock_irqsave(&info->lock, flags); | |
252 | bit = airq_iv_alloc(info->aiv, nvqs); | |
253 | if (bit == -1UL) { | |
254 | /* Not enough vacancies. */ | |
255 | write_unlock_irqrestore(&info->lock, flags); | |
256 | continue; | |
257 | } | |
258 | *first = bit; | |
259 | *airq_info = info; | |
260 | indicator_addr = (unsigned long)info->aiv->vector; | |
261 | for (j = 0; j < nvqs; j++) { | |
262 | airq_iv_set_ptr(info->aiv, bit + j, | |
263 | (unsigned long)vqs[j]); | |
264 | } | |
265 | write_unlock_irqrestore(&info->lock, flags); | |
266 | } | |
267 | return indicator_addr; | |
268 | } | |
269 | ||
270 | static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev) | |
271 | { | |
272 | struct virtio_ccw_vq_info *info; | |
273 | ||
274 | list_for_each_entry(info, &vcdev->virtqueues, node) | |
275 | drop_airq_indicator(info->vq, vcdev->airq_info); | |
276 | } | |
277 | ||
7e64e059 CH |
278 | static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag) |
279 | { | |
280 | unsigned long flags; | |
281 | __u32 ret; | |
282 | ||
283 | spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); | |
284 | if (vcdev->err) | |
285 | ret = 0; | |
286 | else | |
287 | ret = vcdev->curr_io & flag; | |
288 | spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); | |
289 | return ret; | |
290 | } | |
291 | ||
73fa21ea CH |
292 | static int ccw_io_helper(struct virtio_ccw_device *vcdev, |
293 | struct ccw1 *ccw, __u32 intparm) | |
7e64e059 CH |
294 | { |
295 | int ret; | |
296 | unsigned long flags; | |
297 | int flag = intparm & VIRTIO_CCW_INTPARM_MASK; | |
298 | ||
b26ba22b CB |
299 | do { |
300 | spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); | |
301 | ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0); | |
99437a27 CH |
302 | if (!ret) { |
303 | if (!vcdev->curr_io) | |
304 | vcdev->err = 0; | |
b26ba22b | 305 | vcdev->curr_io |= flag; |
99437a27 | 306 | } |
b26ba22b CB |
307 | spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); |
308 | cpu_relax(); | |
309 | } while (ret == -EBUSY); | |
7e64e059 CH |
310 | wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0); |
311 | return ret ? ret : vcdev->err; | |
312 | } | |
313 | ||
96b14536 CH |
314 | static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev, |
315 | struct ccw1 *ccw) | |
316 | { | |
317 | int ret; | |
318 | unsigned long *indicatorp = NULL; | |
319 | struct virtio_thinint_area *thinint_area = NULL; | |
320 | struct airq_info *airq_info = vcdev->airq_info; | |
321 | ||
322 | if (vcdev->is_thinint) { | |
323 | thinint_area = kzalloc(sizeof(*thinint_area), | |
324 | GFP_DMA | GFP_KERNEL); | |
325 | if (!thinint_area) | |
326 | return; | |
327 | thinint_area->summary_indicator = | |
328 | (unsigned long) &airq_info->summary_indicator; | |
329 | thinint_area->isc = VIRTIO_AIRQ_ISC; | |
330 | ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; | |
331 | ccw->count = sizeof(*thinint_area); | |
332 | ccw->cda = (__u32)(unsigned long) thinint_area; | |
333 | } else { | |
c235082b | 334 | /* payload is the address of the indicators */ |
96b14536 CH |
335 | indicatorp = kmalloc(sizeof(&vcdev->indicators), |
336 | GFP_DMA | GFP_KERNEL); | |
337 | if (!indicatorp) | |
338 | return; | |
339 | *indicatorp = 0; | |
340 | ccw->cmd_code = CCW_CMD_SET_IND; | |
c235082b | 341 | ccw->count = sizeof(&vcdev->indicators); |
96b14536 CH |
342 | ccw->cda = (__u32)(unsigned long) indicatorp; |
343 | } | |
344 | /* Deregister indicators from host. */ | |
345 | vcdev->indicators = 0; | |
346 | ccw->flags = 0; | |
347 | ret = ccw_io_helper(vcdev, ccw, | |
348 | vcdev->is_thinint ? | |
349 | VIRTIO_CCW_DOING_SET_IND_ADAPTER : | |
350 | VIRTIO_CCW_DOING_SET_IND); | |
351 | if (ret && (ret != -ENODEV)) | |
352 | dev_info(&vcdev->cdev->dev, | |
353 | "Failed to deregister indicators (%d)\n", ret); | |
354 | else if (vcdev->is_thinint) | |
355 | virtio_ccw_drop_indicators(vcdev); | |
356 | kfree(indicatorp); | |
357 | kfree(thinint_area); | |
358 | } | |
359 | ||
1ec2772e MS |
360 | static inline long __do_kvm_notify(struct subchannel_id schid, |
361 | unsigned long queue_index, | |
362 | long cookie) | |
7e64e059 CH |
363 | { |
364 | register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY; | |
365 | register struct subchannel_id __schid asm("2") = schid; | |
366 | register unsigned long __index asm("3") = queue_index; | |
367 | register long __rc asm("2"); | |
07e16933 | 368 | register long __cookie asm("4") = cookie; |
7e64e059 CH |
369 | |
370 | asm volatile ("diag 2,4,0x500\n" | |
07e16933 MT |
371 | : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index), |
372 | "d"(__cookie) | |
7e64e059 CH |
373 | : "memory", "cc"); |
374 | return __rc; | |
375 | } | |
376 | ||
1ec2772e MS |
377 | static inline long do_kvm_notify(struct subchannel_id schid, |
378 | unsigned long queue_index, | |
379 | long cookie) | |
380 | { | |
381 | diag_stat_inc(DIAG_STAT_X500); | |
382 | return __do_kvm_notify(schid, queue_index, cookie); | |
383 | } | |
384 | ||
46f9c2b9 | 385 | static bool virtio_ccw_kvm_notify(struct virtqueue *vq) |
7e64e059 CH |
386 | { |
387 | struct virtio_ccw_vq_info *info = vq->priv; | |
388 | struct virtio_ccw_device *vcdev; | |
389 | struct subchannel_id schid; | |
390 | ||
391 | vcdev = to_vc_device(info->vq->vdev); | |
392 | ccw_device_get_schid(vcdev->cdev, &schid); | |
01227a88 | 393 | info->cookie = do_kvm_notify(schid, vq->index, info->cookie); |
46f9c2b9 HG |
394 | if (info->cookie < 0) |
395 | return false; | |
396 | return true; | |
7e64e059 CH |
397 | } |
398 | ||
73fa21ea CH |
399 | static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, |
400 | struct ccw1 *ccw, int index) | |
7e64e059 | 401 | { |
ad2aa042 PM |
402 | int ret; |
403 | ||
7e64e059 | 404 | vcdev->config_block->index = index; |
73fa21ea CH |
405 | ccw->cmd_code = CCW_CMD_READ_VQ_CONF; |
406 | ccw->flags = 0; | |
407 | ccw->count = sizeof(struct vq_config_block); | |
408 | ccw->cda = (__u32)(unsigned long)(vcdev->config_block); | |
ad2aa042 PM |
409 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF); |
410 | if (ret) | |
411 | return ret; | |
7e64e059 CH |
412 | return vcdev->config_block->num; |
413 | } | |
414 | ||
73fa21ea | 415 | static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw) |
7e64e059 CH |
416 | { |
417 | struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev); | |
418 | struct virtio_ccw_vq_info *info = vq->priv; | |
419 | unsigned long flags; | |
420 | unsigned long size; | |
421 | int ret; | |
9d0ca6ed | 422 | unsigned int index = vq->index; |
7e64e059 CH |
423 | |
424 | /* Remove from our list. */ | |
425 | spin_lock_irqsave(&vcdev->lock, flags); | |
426 | list_del(&info->node); | |
427 | spin_unlock_irqrestore(&vcdev->lock, flags); | |
428 | ||
429 | /* Release from host. */ | |
d4674240 CH |
430 | if (vcdev->revision == 0) { |
431 | info->info_block->l.queue = 0; | |
432 | info->info_block->l.align = 0; | |
433 | info->info_block->l.index = index; | |
434 | info->info_block->l.num = 0; | |
435 | ccw->count = sizeof(info->info_block->l); | |
436 | } else { | |
437 | info->info_block->s.desc = 0; | |
438 | info->info_block->s.index = index; | |
439 | info->info_block->s.num = 0; | |
440 | info->info_block->s.avail = 0; | |
441 | info->info_block->s.used = 0; | |
442 | ccw->count = sizeof(info->info_block->s); | |
443 | } | |
73fa21ea CH |
444 | ccw->cmd_code = CCW_CMD_SET_VQ; |
445 | ccw->flags = 0; | |
73fa21ea CH |
446 | ccw->cda = (__u32)(unsigned long)(info->info_block); |
447 | ret = ccw_io_helper(vcdev, ccw, | |
448 | VIRTIO_CCW_DOING_SET_VQ | index); | |
7e64e059 CH |
449 | /* |
450 | * -ENODEV isn't considered an error: The device is gone anyway. | |
451 | * This may happen on device detach. | |
452 | */ | |
453 | if (ret && (ret != -ENODEV)) | |
99240622 | 454 | dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n", |
7e64e059 CH |
455 | ret, index); |
456 | ||
457 | vring_del_virtqueue(vq); | |
458 | size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN)); | |
459 | free_pages_exact(info->queue, size); | |
460 | kfree(info->info_block); | |
461 | kfree(info); | |
462 | } | |
463 | ||
464 | static void virtio_ccw_del_vqs(struct virtio_device *vdev) | |
465 | { | |
466 | struct virtqueue *vq, *n; | |
73fa21ea | 467 | struct ccw1 *ccw; |
96b14536 | 468 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
73fa21ea CH |
469 | |
470 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); | |
471 | if (!ccw) | |
472 | return; | |
473 | ||
96b14536 | 474 | virtio_ccw_drop_indicator(vcdev, ccw); |
7e64e059 CH |
475 | |
476 | list_for_each_entry_safe(vq, n, &vdev->vqs, list) | |
73fa21ea CH |
477 | virtio_ccw_del_vq(vq, ccw); |
478 | ||
479 | kfree(ccw); | |
7e64e059 CH |
480 | } |
481 | ||
482 | static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, | |
483 | int i, vq_callback_t *callback, | |
f94682dd | 484 | const char *name, bool ctx, |
73fa21ea | 485 | struct ccw1 *ccw) |
7e64e059 CH |
486 | { |
487 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
488 | int err; | |
c98d3683 | 489 | struct virtqueue *vq = NULL; |
7e64e059 | 490 | struct virtio_ccw_vq_info *info; |
c98d3683 | 491 | unsigned long size = 0; /* silence the compiler */ |
7e64e059 CH |
492 | unsigned long flags; |
493 | ||
494 | /* Allocate queue. */ | |
495 | info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL); | |
496 | if (!info) { | |
497 | dev_warn(&vcdev->cdev->dev, "no info\n"); | |
498 | err = -ENOMEM; | |
499 | goto out_err; | |
500 | } | |
501 | info->info_block = kzalloc(sizeof(*info->info_block), | |
502 | GFP_DMA | GFP_KERNEL); | |
503 | if (!info->info_block) { | |
504 | dev_warn(&vcdev->cdev->dev, "no info block\n"); | |
505 | err = -ENOMEM; | |
506 | goto out_err; | |
507 | } | |
73fa21ea | 508 | info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i); |
ad2aa042 PM |
509 | if (info->num < 0) { |
510 | err = info->num; | |
511 | goto out_err; | |
512 | } | |
7e64e059 CH |
513 | size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN)); |
514 | info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO); | |
515 | if (info->queue == NULL) { | |
516 | dev_warn(&vcdev->cdev->dev, "no queue\n"); | |
517 | err = -ENOMEM; | |
518 | goto out_err; | |
519 | } | |
520 | ||
521 | vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev, | |
f94682dd | 522 | true, ctx, info->queue, virtio_ccw_kvm_notify, |
7e64e059 CH |
523 | callback, name); |
524 | if (!vq) { | |
525 | /* For now, we fail if we can't get the requested size. */ | |
526 | dev_warn(&vcdev->cdev->dev, "no vq\n"); | |
527 | err = -ENOMEM; | |
7e64e059 CH |
528 | goto out_err; |
529 | } | |
7e64e059 CH |
530 | |
531 | /* Register it with the host. */ | |
d4674240 CH |
532 | if (vcdev->revision == 0) { |
533 | info->info_block->l.queue = (__u64)info->queue; | |
534 | info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN; | |
535 | info->info_block->l.index = i; | |
536 | info->info_block->l.num = info->num; | |
537 | ccw->count = sizeof(info->info_block->l); | |
538 | } else { | |
539 | info->info_block->s.desc = (__u64)info->queue; | |
540 | info->info_block->s.index = i; | |
541 | info->info_block->s.num = info->num; | |
542 | info->info_block->s.avail = (__u64)virtqueue_get_avail(vq); | |
543 | info->info_block->s.used = (__u64)virtqueue_get_used(vq); | |
544 | ccw->count = sizeof(info->info_block->s); | |
545 | } | |
73fa21ea CH |
546 | ccw->cmd_code = CCW_CMD_SET_VQ; |
547 | ccw->flags = 0; | |
73fa21ea CH |
548 | ccw->cda = (__u32)(unsigned long)(info->info_block); |
549 | err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i); | |
7e64e059 CH |
550 | if (err) { |
551 | dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n"); | |
7e64e059 CH |
552 | goto out_err; |
553 | } | |
554 | ||
c98d3683 CH |
555 | info->vq = vq; |
556 | vq->priv = info; | |
557 | ||
7e64e059 CH |
558 | /* Save it to our list. */ |
559 | spin_lock_irqsave(&vcdev->lock, flags); | |
560 | list_add(&info->node, &vcdev->virtqueues); | |
561 | spin_unlock_irqrestore(&vcdev->lock, flags); | |
562 | ||
563 | return vq; | |
564 | ||
565 | out_err: | |
c98d3683 CH |
566 | if (vq) |
567 | vring_del_virtqueue(vq); | |
568 | if (info) { | |
569 | if (info->queue) | |
570 | free_pages_exact(info->queue, size); | |
7e64e059 | 571 | kfree(info->info_block); |
c98d3683 | 572 | } |
7e64e059 CH |
573 | kfree(info); |
574 | return ERR_PTR(err); | |
575 | } | |
576 | ||
96b14536 CH |
577 | static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev, |
578 | struct virtqueue *vqs[], int nvqs, | |
579 | struct ccw1 *ccw) | |
580 | { | |
581 | int ret; | |
582 | struct virtio_thinint_area *thinint_area = NULL; | |
583 | struct airq_info *info; | |
584 | ||
585 | thinint_area = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL); | |
586 | if (!thinint_area) { | |
587 | ret = -ENOMEM; | |
588 | goto out; | |
589 | } | |
590 | /* Try to get an indicator. */ | |
591 | thinint_area->indicator = get_airq_indicator(vqs, nvqs, | |
592 | &thinint_area->bit_nr, | |
593 | &vcdev->airq_info); | |
594 | if (!thinint_area->indicator) { | |
595 | ret = -ENOSPC; | |
596 | goto out; | |
597 | } | |
598 | info = vcdev->airq_info; | |
599 | thinint_area->summary_indicator = | |
600 | (unsigned long) &info->summary_indicator; | |
601 | thinint_area->isc = VIRTIO_AIRQ_ISC; | |
602 | ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; | |
603 | ccw->flags = CCW_FLAG_SLI; | |
604 | ccw->count = sizeof(*thinint_area); | |
605 | ccw->cda = (__u32)(unsigned long)thinint_area; | |
606 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER); | |
607 | if (ret) { | |
608 | if (ret == -EOPNOTSUPP) { | |
609 | /* | |
610 | * The host does not support adapter interrupts | |
611 | * for virtio-ccw, stop trying. | |
612 | */ | |
613 | virtio_ccw_use_airq = 0; | |
614 | pr_info("Adapter interrupts unsupported on host\n"); | |
615 | } else | |
616 | dev_warn(&vcdev->cdev->dev, | |
617 | "enabling adapter interrupts = %d\n", ret); | |
618 | virtio_ccw_drop_indicators(vcdev); | |
619 | } | |
620 | out: | |
621 | kfree(thinint_area); | |
622 | return ret; | |
623 | } | |
624 | ||
7e64e059 CH |
625 | static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, |
626 | struct virtqueue *vqs[], | |
627 | vq_callback_t *callbacks[], | |
fb5e31d9 | 628 | const char * const names[], |
f94682dd | 629 | const bool *ctx, |
fb5e31d9 | 630 | struct irq_affinity *desc) |
7e64e059 CH |
631 | { |
632 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
633 | unsigned long *indicatorp = NULL; | |
634 | int ret, i; | |
73fa21ea CH |
635 | struct ccw1 *ccw; |
636 | ||
637 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); | |
638 | if (!ccw) | |
639 | return -ENOMEM; | |
7e64e059 CH |
640 | |
641 | for (i = 0; i < nvqs; ++i) { | |
73fa21ea | 642 | vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i], |
f94682dd | 643 | ctx ? ctx[i] : false, ccw); |
7e64e059 CH |
644 | if (IS_ERR(vqs[i])) { |
645 | ret = PTR_ERR(vqs[i]); | |
646 | vqs[i] = NULL; | |
647 | goto out; | |
648 | } | |
649 | } | |
650 | ret = -ENOMEM; | |
c235082b CH |
651 | /* |
652 | * We need a data area under 2G to communicate. Our payload is | |
653 | * the address of the indicators. | |
654 | */ | |
7e64e059 CH |
655 | indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL); |
656 | if (!indicatorp) | |
657 | goto out; | |
658 | *indicatorp = (unsigned long) &vcdev->indicators; | |
96b14536 CH |
659 | if (vcdev->is_thinint) { |
660 | ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); | |
661 | if (ret) | |
662 | /* no error, just fall back to legacy interrupts */ | |
970ba6ac | 663 | vcdev->is_thinint = false; |
96b14536 CH |
664 | } |
665 | if (!vcdev->is_thinint) { | |
666 | /* Register queue indicators with host. */ | |
667 | vcdev->indicators = 0; | |
668 | ccw->cmd_code = CCW_CMD_SET_IND; | |
669 | ccw->flags = 0; | |
c235082b | 670 | ccw->count = sizeof(&vcdev->indicators); |
96b14536 CH |
671 | ccw->cda = (__u32)(unsigned long) indicatorp; |
672 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); | |
673 | if (ret) | |
674 | goto out; | |
675 | } | |
7e64e059 CH |
676 | /* Register indicators2 with host for config changes */ |
677 | *indicatorp = (unsigned long) &vcdev->indicators2; | |
678 | vcdev->indicators2 = 0; | |
73fa21ea CH |
679 | ccw->cmd_code = CCW_CMD_SET_CONF_IND; |
680 | ccw->flags = 0; | |
c235082b | 681 | ccw->count = sizeof(&vcdev->indicators2); |
73fa21ea CH |
682 | ccw->cda = (__u32)(unsigned long) indicatorp; |
683 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); | |
7e64e059 CH |
684 | if (ret) |
685 | goto out; | |
686 | ||
687 | kfree(indicatorp); | |
73fa21ea | 688 | kfree(ccw); |
7e64e059 CH |
689 | return 0; |
690 | out: | |
691 | kfree(indicatorp); | |
73fa21ea | 692 | kfree(ccw); |
7e64e059 CH |
693 | virtio_ccw_del_vqs(vdev); |
694 | return ret; | |
695 | } | |
696 | ||
697 | static void virtio_ccw_reset(struct virtio_device *vdev) | |
698 | { | |
699 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
73fa21ea CH |
700 | struct ccw1 *ccw; |
701 | ||
702 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); | |
703 | if (!ccw) | |
704 | return; | |
7e64e059 CH |
705 | |
706 | /* Zero status bits. */ | |
73fa21ea | 707 | *vcdev->status = 0; |
7e64e059 CH |
708 | |
709 | /* Send a reset ccw on device. */ | |
73fa21ea CH |
710 | ccw->cmd_code = CCW_CMD_VDEV_RESET; |
711 | ccw->flags = 0; | |
712 | ccw->count = 0; | |
713 | ccw->cda = 0; | |
714 | ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); | |
715 | kfree(ccw); | |
7e64e059 CH |
716 | } |
717 | ||
d0254773 | 718 | static u64 virtio_ccw_get_features(struct virtio_device *vdev) |
7e64e059 CH |
719 | { |
720 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
73fa21ea | 721 | struct virtio_feature_desc *features; |
732c56e9 MT |
722 | int ret; |
723 | u64 rc; | |
73fa21ea | 724 | struct ccw1 *ccw; |
7e64e059 | 725 | |
73fa21ea CH |
726 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); |
727 | if (!ccw) | |
728 | return 0; | |
729 | ||
730 | features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); | |
731 | if (!features) { | |
732 | rc = 0; | |
733 | goto out_free; | |
734 | } | |
7e64e059 | 735 | /* Read the feature bits from the host. */ |
73fa21ea CH |
736 | features->index = 0; |
737 | ccw->cmd_code = CCW_CMD_READ_FEAT; | |
738 | ccw->flags = 0; | |
739 | ccw->count = sizeof(*features); | |
740 | ccw->cda = (__u32)(unsigned long)features; | |
741 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); | |
742 | if (ret) { | |
743 | rc = 0; | |
744 | goto out_free; | |
745 | } | |
746 | ||
747 | rc = le32_to_cpu(features->features); | |
7e64e059 | 748 | |
ce15408f MT |
749 | if (vcdev->revision == 0) |
750 | goto out_free; | |
751 | ||
732c56e9 MT |
752 | /* Read second half of the feature bits from the host. */ |
753 | features->index = 1; | |
754 | ccw->cmd_code = CCW_CMD_READ_FEAT; | |
755 | ccw->flags = 0; | |
756 | ccw->count = sizeof(*features); | |
757 | ccw->cda = (__u32)(unsigned long)features; | |
758 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); | |
759 | if (ret == 0) | |
760 | rc |= (u64)le32_to_cpu(features->features) << 32; | |
761 | ||
73fa21ea CH |
762 | out_free: |
763 | kfree(features); | |
764 | kfree(ccw); | |
765 | return rc; | |
7e64e059 CH |
766 | } |
767 | ||
5c609a5e | 768 | static int virtio_ccw_finalize_features(struct virtio_device *vdev) |
7e64e059 CH |
769 | { |
770 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
73fa21ea | 771 | struct virtio_feature_desc *features; |
73fa21ea | 772 | struct ccw1 *ccw; |
f01a2a81 | 773 | int ret; |
73fa21ea | 774 | |
f13d8bc2 | 775 | if (vcdev->revision >= 1 && |
4d23676f MT |
776 | !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { |
777 | dev_err(&vdev->dev, "virtio: device uses revision 1 " | |
778 | "but does not have VIRTIO_F_VERSION_1\n"); | |
779 | return -EINVAL; | |
780 | } | |
781 | ||
73fa21ea CH |
782 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); |
783 | if (!ccw) | |
f01a2a81 | 784 | return -ENOMEM; |
73fa21ea CH |
785 | |
786 | features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); | |
f01a2a81 CH |
787 | if (!features) { |
788 | ret = -ENOMEM; | |
73fa21ea | 789 | goto out_free; |
f01a2a81 | 790 | } |
7e64e059 CH |
791 | /* Give virtio_ring a chance to accept features. */ |
792 | vring_transport_features(vdev); | |
793 | ||
e16e12be | 794 | features->index = 0; |
732c56e9 MT |
795 | features->features = cpu_to_le32((u32)vdev->features); |
796 | /* Write the first half of the feature bits to the host. */ | |
797 | ccw->cmd_code = CCW_CMD_WRITE_FEAT; | |
798 | ccw->flags = 0; | |
799 | ccw->count = sizeof(*features); | |
800 | ccw->cda = (__u32)(unsigned long)features; | |
f01a2a81 CH |
801 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); |
802 | if (ret) | |
803 | goto out_free; | |
732c56e9 | 804 | |
ce15408f MT |
805 | if (vcdev->revision == 0) |
806 | goto out_free; | |
807 | ||
732c56e9 MT |
808 | features->index = 1; |
809 | features->features = cpu_to_le32(vdev->features >> 32); | |
810 | /* Write the second half of the feature bits to the host. */ | |
e16e12be MT |
811 | ccw->cmd_code = CCW_CMD_WRITE_FEAT; |
812 | ccw->flags = 0; | |
813 | ccw->count = sizeof(*features); | |
814 | ccw->cda = (__u32)(unsigned long)features; | |
f01a2a81 | 815 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); |
e16e12be | 816 | |
73fa21ea CH |
817 | out_free: |
818 | kfree(features); | |
819 | kfree(ccw); | |
5c609a5e | 820 | |
f01a2a81 | 821 | return ret; |
7e64e059 CH |
822 | } |
823 | ||
824 | static void virtio_ccw_get_config(struct virtio_device *vdev, | |
825 | unsigned int offset, void *buf, unsigned len) | |
826 | { | |
827 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
828 | int ret; | |
73fa21ea CH |
829 | struct ccw1 *ccw; |
830 | void *config_area; | |
831 | ||
832 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); | |
833 | if (!ccw) | |
834 | return; | |
835 | ||
836 | config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); | |
837 | if (!config_area) | |
838 | goto out_free; | |
7e64e059 CH |
839 | |
840 | /* Read the config area from the host. */ | |
73fa21ea CH |
841 | ccw->cmd_code = CCW_CMD_READ_CONF; |
842 | ccw->flags = 0; | |
843 | ccw->count = offset + len; | |
844 | ccw->cda = (__u32)(unsigned long)config_area; | |
845 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); | |
7e64e059 | 846 | if (ret) |
73fa21ea | 847 | goto out_free; |
7e64e059 | 848 | |
431dae77 CH |
849 | memcpy(vcdev->config, config_area, offset + len); |
850 | if (buf) | |
851 | memcpy(buf, &vcdev->config[offset], len); | |
852 | if (vcdev->config_ready < offset + len) | |
853 | vcdev->config_ready = offset + len; | |
73fa21ea CH |
854 | |
855 | out_free: | |
856 | kfree(config_area); | |
857 | kfree(ccw); | |
7e64e059 CH |
858 | } |
859 | ||
860 | static void virtio_ccw_set_config(struct virtio_device *vdev, | |
861 | unsigned int offset, const void *buf, | |
862 | unsigned len) | |
863 | { | |
864 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
73fa21ea CH |
865 | struct ccw1 *ccw; |
866 | void *config_area; | |
867 | ||
868 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); | |
869 | if (!ccw) | |
870 | return; | |
871 | ||
872 | config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); | |
873 | if (!config_area) | |
874 | goto out_free; | |
7e64e059 | 875 | |
431dae77 CH |
876 | /* Make sure we don't overwrite fields. */ |
877 | if (vcdev->config_ready < offset) | |
878 | virtio_ccw_get_config(vdev, 0, NULL, offset); | |
7e64e059 CH |
879 | memcpy(&vcdev->config[offset], buf, len); |
880 | /* Write the config area to the host. */ | |
73fa21ea CH |
881 | memcpy(config_area, vcdev->config, sizeof(vcdev->config)); |
882 | ccw->cmd_code = CCW_CMD_WRITE_CONF; | |
883 | ccw->flags = 0; | |
884 | ccw->count = offset + len; | |
885 | ccw->cda = (__u32)(unsigned long)config_area; | |
886 | ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); | |
887 | ||
888 | out_free: | |
889 | kfree(config_area); | |
890 | kfree(ccw); | |
7e64e059 CH |
891 | } |
892 | ||
893 | static u8 virtio_ccw_get_status(struct virtio_device *vdev) | |
894 | { | |
895 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
7d3ce5ab PM |
896 | u8 old_status = *vcdev->status; |
897 | struct ccw1 *ccw; | |
898 | ||
899 | if (vcdev->revision < 1) | |
900 | return *vcdev->status; | |
901 | ||
902 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); | |
903 | if (!ccw) | |
904 | return old_status; | |
905 | ||
906 | ccw->cmd_code = CCW_CMD_READ_STATUS; | |
907 | ccw->flags = 0; | |
908 | ccw->count = sizeof(*vcdev->status); | |
909 | ccw->cda = (__u32)(unsigned long)vcdev->status; | |
910 | ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS); | |
911 | /* | |
912 | * If the channel program failed (should only happen if the device | |
913 | * was hotunplugged, and then we clean up via the machine check | |
914 | * handler anyway), vcdev->status was not overwritten and we just | |
915 | * return the old status, which is fine. | |
916 | */ | |
917 | kfree(ccw); | |
7e64e059 | 918 | |
73fa21ea | 919 | return *vcdev->status; |
7e64e059 CH |
920 | } |
921 | ||
922 | static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) | |
923 | { | |
924 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
48555136 | 925 | u8 old_status = *vcdev->status; |
73fa21ea | 926 | struct ccw1 *ccw; |
48555136 | 927 | int ret; |
73fa21ea CH |
928 | |
929 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); | |
930 | if (!ccw) | |
931 | return; | |
7e64e059 CH |
932 | |
933 | /* Write the status to the host. */ | |
73fa21ea CH |
934 | *vcdev->status = status; |
935 | ccw->cmd_code = CCW_CMD_WRITE_STATUS; | |
936 | ccw->flags = 0; | |
937 | ccw->count = sizeof(status); | |
938 | ccw->cda = (__u32)(unsigned long)vcdev->status; | |
48555136 MT |
939 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); |
940 | /* Write failed? We assume status is unchanged. */ | |
941 | if (ret) | |
942 | *vcdev->status = old_status; | |
73fa21ea | 943 | kfree(ccw); |
7e64e059 CH |
944 | } |
945 | ||
0db1dba5 | 946 | static const struct virtio_config_ops virtio_ccw_config_ops = { |
7e64e059 CH |
947 | .get_features = virtio_ccw_get_features, |
948 | .finalize_features = virtio_ccw_finalize_features, | |
949 | .get = virtio_ccw_get_config, | |
950 | .set = virtio_ccw_set_config, | |
951 | .get_status = virtio_ccw_get_status, | |
952 | .set_status = virtio_ccw_set_status, | |
953 | .reset = virtio_ccw_reset, | |
954 | .find_vqs = virtio_ccw_find_vqs, | |
955 | .del_vqs = virtio_ccw_del_vqs, | |
956 | }; | |
957 | ||
958 | ||
959 | /* | |
960 | * ccw bus driver related functions | |
961 | */ | |
962 | ||
963 | static void virtio_ccw_release_dev(struct device *_d) | |
964 | { | |
15e90f52 | 965 | struct virtio_device *dev = dev_to_virtio(_d); |
7e64e059 CH |
966 | struct virtio_ccw_device *vcdev = to_vc_device(dev); |
967 | ||
73fa21ea | 968 | kfree(vcdev->status); |
7e64e059 | 969 | kfree(vcdev->config_block); |
7e64e059 CH |
970 | kfree(vcdev); |
971 | } | |
972 | ||
973 | static int irb_is_error(struct irb *irb) | |
974 | { | |
975 | if (scsw_cstat(&irb->scsw) != 0) | |
976 | return 1; | |
977 | if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) | |
978 | return 1; | |
979 | if (scsw_cc(&irb->scsw) != 0) | |
980 | return 1; | |
981 | return 0; | |
982 | } | |
983 | ||
984 | static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, | |
985 | int index) | |
986 | { | |
987 | struct virtio_ccw_vq_info *info; | |
988 | unsigned long flags; | |
989 | struct virtqueue *vq; | |
990 | ||
991 | vq = NULL; | |
992 | spin_lock_irqsave(&vcdev->lock, flags); | |
993 | list_for_each_entry(info, &vcdev->virtqueues, node) { | |
9d0ca6ed | 994 | if (info->vq->index == index) { |
7e64e059 CH |
995 | vq = info->vq; |
996 | break; | |
997 | } | |
998 | } | |
999 | spin_unlock_irqrestore(&vcdev->lock, flags); | |
1000 | return vq; | |
1001 | } | |
1002 | ||
74a599f0 CH |
1003 | static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, |
1004 | __u32 activity) | |
1005 | { | |
1006 | if (vcdev->curr_io & activity) { | |
1007 | switch (activity) { | |
1008 | case VIRTIO_CCW_DOING_READ_FEAT: | |
1009 | case VIRTIO_CCW_DOING_WRITE_FEAT: | |
1010 | case VIRTIO_CCW_DOING_READ_CONFIG: | |
1011 | case VIRTIO_CCW_DOING_WRITE_CONFIG: | |
1012 | case VIRTIO_CCW_DOING_WRITE_STATUS: | |
7d3ce5ab | 1013 | case VIRTIO_CCW_DOING_READ_STATUS: |
74a599f0 CH |
1014 | case VIRTIO_CCW_DOING_SET_VQ: |
1015 | case VIRTIO_CCW_DOING_SET_IND: | |
1016 | case VIRTIO_CCW_DOING_SET_CONF_IND: | |
1017 | case VIRTIO_CCW_DOING_RESET: | |
1018 | case VIRTIO_CCW_DOING_READ_VQ_CONF: | |
1019 | case VIRTIO_CCW_DOING_SET_IND_ADAPTER: | |
1020 | case VIRTIO_CCW_DOING_SET_VIRTIO_REV: | |
1021 | vcdev->curr_io &= ~activity; | |
1022 | wake_up(&vcdev->wait_q); | |
1023 | break; | |
1024 | default: | |
1025 | /* don't know what to do... */ | |
1026 | dev_warn(&vcdev->cdev->dev, | |
1027 | "Suspicious activity '%08x'\n", activity); | |
1028 | WARN_ON(1); | |
1029 | break; | |
1030 | } | |
1031 | } | |
1032 | } | |
1033 | ||
7e64e059 CH |
1034 | static void virtio_ccw_int_handler(struct ccw_device *cdev, |
1035 | unsigned long intparm, | |
1036 | struct irb *irb) | |
1037 | { | |
1038 | __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; | |
1039 | struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); | |
1040 | int i; | |
1041 | struct virtqueue *vq; | |
7e64e059 | 1042 | |
2e021043 HG |
1043 | if (!vcdev) |
1044 | return; | |
74a599f0 CH |
1045 | if (IS_ERR(irb)) { |
1046 | vcdev->err = PTR_ERR(irb); | |
1047 | virtio_ccw_check_activity(vcdev, activity); | |
1048 | /* Don't poke around indicators, something's wrong. */ | |
1049 | return; | |
1050 | } | |
7e64e059 CH |
1051 | /* Check if it's a notification from the host. */ |
1052 | if ((intparm == 0) && | |
1053 | (scsw_stctl(&irb->scsw) == | |
1054 | (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { | |
1055 | /* OK */ | |
1056 | } | |
19e4735b CH |
1057 | if (irb_is_error(irb)) { |
1058 | /* Command reject? */ | |
1059 | if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && | |
1060 | (irb->ecw[0] & SNS0_CMD_REJECT)) | |
1061 | vcdev->err = -EOPNOTSUPP; | |
1062 | else | |
1063 | /* Map everything else to -EIO. */ | |
1064 | vcdev->err = -EIO; | |
1065 | } | |
74a599f0 | 1066 | virtio_ccw_check_activity(vcdev, activity); |
7e64e059 CH |
1067 | for_each_set_bit(i, &vcdev->indicators, |
1068 | sizeof(vcdev->indicators) * BITS_PER_BYTE) { | |
1069 | /* The bit clear must happen before the vring kick. */ | |
1070 | clear_bit(i, &vcdev->indicators); | |
1071 | barrier(); | |
1072 | vq = virtio_ccw_vq_by_ind(vcdev, i); | |
1073 | vring_interrupt(0, vq); | |
1074 | } | |
1075 | if (test_bit(0, &vcdev->indicators2)) { | |
016c98c6 | 1076 | virtio_config_changed(&vcdev->vdev); |
7e64e059 CH |
1077 | clear_bit(0, &vcdev->indicators2); |
1078 | } | |
1079 | } | |
1080 | ||
1081 | /* | |
1082 | * We usually want to autoonline all devices, but give the admin | |
1083 | * a way to exempt devices from this. | |
1084 | */ | |
1085 | #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ | |
1086 | (8*sizeof(long))) | |
1087 | static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; | |
1088 | ||
1089 | static char *no_auto = ""; | |
1090 | ||
1091 | module_param(no_auto, charp, 0444); | |
1092 | MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); | |
1093 | ||
1094 | static int virtio_ccw_check_autoonline(struct ccw_device *cdev) | |
1095 | { | |
1096 | struct ccw_dev_id id; | |
1097 | ||
1098 | ccw_device_get_id(cdev, &id); | |
1099 | if (test_bit(id.devno, devs_no_auto[id.ssid])) | |
1100 | return 0; | |
1101 | return 1; | |
1102 | } | |
1103 | ||
1104 | static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) | |
1105 | { | |
1106 | struct ccw_device *cdev = data; | |
1107 | int ret; | |
1108 | ||
1109 | ret = ccw_device_set_online(cdev); | |
1110 | if (ret) | |
1111 | dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); | |
1112 | } | |
1113 | ||
1114 | static int virtio_ccw_probe(struct ccw_device *cdev) | |
1115 | { | |
1116 | cdev->handler = virtio_ccw_int_handler; | |
1117 | ||
1118 | if (virtio_ccw_check_autoonline(cdev)) | |
1119 | async_schedule(virtio_ccw_auto_online, cdev); | |
1120 | return 0; | |
1121 | } | |
1122 | ||
2e021043 HG |
1123 | static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) |
1124 | { | |
1125 | unsigned long flags; | |
1126 | struct virtio_ccw_device *vcdev; | |
1127 | ||
1128 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1129 | vcdev = dev_get_drvdata(&cdev->dev); | |
79629b20 | 1130 | if (!vcdev || vcdev->going_away) { |
2e021043 HG |
1131 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
1132 | return NULL; | |
1133 | } | |
79629b20 | 1134 | vcdev->going_away = true; |
2e021043 HG |
1135 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
1136 | return vcdev; | |
1137 | } | |
1138 | ||
7e64e059 CH |
1139 | static void virtio_ccw_remove(struct ccw_device *cdev) |
1140 | { | |
79629b20 | 1141 | unsigned long flags; |
2e021043 | 1142 | struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); |
7e64e059 | 1143 | |
e75279c4 HG |
1144 | if (vcdev && cdev->online) { |
1145 | if (vcdev->device_lost) | |
1146 | virtio_break_device(&vcdev->vdev); | |
7e64e059 | 1147 | unregister_virtio_device(&vcdev->vdev); |
e75279c4 HG |
1148 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
1149 | dev_set_drvdata(&cdev->dev, NULL); | |
1150 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1151 | } | |
7e64e059 CH |
1152 | cdev->handler = NULL; |
1153 | } | |
1154 | ||
1155 | static int virtio_ccw_offline(struct ccw_device *cdev) | |
1156 | { | |
79629b20 | 1157 | unsigned long flags; |
2e021043 | 1158 | struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); |
7e64e059 | 1159 | |
e75279c4 HG |
1160 | if (!vcdev) |
1161 | return 0; | |
1162 | if (vcdev->device_lost) | |
1163 | virtio_break_device(&vcdev->vdev); | |
1164 | unregister_virtio_device(&vcdev->vdev); | |
1165 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1166 | dev_set_drvdata(&cdev->dev, NULL); | |
1167 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
7e64e059 CH |
1168 | return 0; |
1169 | } | |
1170 | ||
6bb2c835 TH |
1171 | static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) |
1172 | { | |
1173 | struct virtio_rev_info *rev; | |
1174 | struct ccw1 *ccw; | |
1175 | int ret; | |
1176 | ||
1177 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); | |
1178 | if (!ccw) | |
1179 | return -ENOMEM; | |
1180 | rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL); | |
1181 | if (!rev) { | |
1182 | kfree(ccw); | |
1183 | return -ENOMEM; | |
1184 | } | |
1185 | ||
1186 | /* Set transport revision */ | |
1187 | ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; | |
1188 | ccw->flags = 0; | |
1189 | ccw->count = sizeof(*rev); | |
1190 | ccw->cda = (__u32)(unsigned long)rev; | |
1191 | ||
1192 | vcdev->revision = VIRTIO_CCW_REV_MAX; | |
1193 | do { | |
1194 | rev->revision = vcdev->revision; | |
1195 | /* none of our supported revisions carry payload */ | |
1196 | rev->length = 0; | |
1197 | ret = ccw_io_helper(vcdev, ccw, | |
1198 | VIRTIO_CCW_DOING_SET_VIRTIO_REV); | |
1199 | if (ret == -EOPNOTSUPP) { | |
1200 | if (vcdev->revision == 0) | |
1201 | /* | |
1202 | * The host device does not support setting | |
1203 | * the revision: let's operate it in legacy | |
1204 | * mode. | |
1205 | */ | |
1206 | ret = 0; | |
1207 | else | |
1208 | vcdev->revision--; | |
1209 | } | |
1210 | } while (ret == -EOPNOTSUPP); | |
1211 | ||
1212 | kfree(ccw); | |
1213 | kfree(rev); | |
1214 | return ret; | |
1215 | } | |
7e64e059 | 1216 | |
7e64e059 CH |
1217 | static int virtio_ccw_online(struct ccw_device *cdev) |
1218 | { | |
1219 | int ret; | |
1220 | struct virtio_ccw_device *vcdev; | |
2e021043 | 1221 | unsigned long flags; |
7e64e059 CH |
1222 | |
1223 | vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); | |
1224 | if (!vcdev) { | |
1225 | dev_warn(&cdev->dev, "Could not get memory for virtio\n"); | |
1226 | ret = -ENOMEM; | |
1227 | goto out_free; | |
1228 | } | |
7e64e059 CH |
1229 | vcdev->config_block = kzalloc(sizeof(*vcdev->config_block), |
1230 | GFP_DMA | GFP_KERNEL); | |
1231 | if (!vcdev->config_block) { | |
1232 | ret = -ENOMEM; | |
1233 | goto out_free; | |
1234 | } | |
73fa21ea CH |
1235 | vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL); |
1236 | if (!vcdev->status) { | |
7e64e059 CH |
1237 | ret = -ENOMEM; |
1238 | goto out_free; | |
1239 | } | |
1240 | ||
96b14536 CH |
1241 | vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ |
1242 | ||
7e64e059 CH |
1243 | vcdev->vdev.dev.parent = &cdev->dev; |
1244 | vcdev->vdev.dev.release = virtio_ccw_release_dev; | |
1245 | vcdev->vdev.config = &virtio_ccw_config_ops; | |
1246 | vcdev->cdev = cdev; | |
1247 | init_waitqueue_head(&vcdev->wait_q); | |
1248 | INIT_LIST_HEAD(&vcdev->virtqueues); | |
1249 | spin_lock_init(&vcdev->lock); | |
1250 | ||
2e021043 | 1251 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
7e64e059 | 1252 | dev_set_drvdata(&cdev->dev, vcdev); |
2e021043 | 1253 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
7e64e059 CH |
1254 | vcdev->vdev.id.vendor = cdev->id.cu_type; |
1255 | vcdev->vdev.id.device = cdev->id.cu_model; | |
6bb2c835 | 1256 | |
2003a7a5 MT |
1257 | ret = virtio_ccw_set_transport_rev(vcdev); |
1258 | if (ret) | |
1259 | goto out_free; | |
6bb2c835 | 1260 | |
7e64e059 CH |
1261 | ret = register_virtio_device(&vcdev->vdev); |
1262 | if (ret) { | |
1263 | dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", | |
1264 | ret); | |
1265 | goto out_put; | |
1266 | } | |
1267 | return 0; | |
1268 | out_put: | |
2e021043 | 1269 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
7e64e059 | 1270 | dev_set_drvdata(&cdev->dev, NULL); |
2e021043 | 1271 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
7e64e059 CH |
1272 | put_device(&vcdev->vdev.dev); |
1273 | return ret; | |
1274 | out_free: | |
1275 | if (vcdev) { | |
73fa21ea | 1276 | kfree(vcdev->status); |
7e64e059 | 1277 | kfree(vcdev->config_block); |
7e64e059 CH |
1278 | } |
1279 | kfree(vcdev); | |
1280 | return ret; | |
1281 | } | |
1282 | ||
1283 | static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) | |
1284 | { | |
e75279c4 HG |
1285 | int rc; |
1286 | struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); | |
1287 | ||
1288 | /* | |
1289 | * Make sure vcdev is set | |
1290 | * i.e. set_offline/remove callback not already running | |
1291 | */ | |
1292 | if (!vcdev) | |
1293 | return NOTIFY_DONE; | |
1294 | ||
1295 | switch (event) { | |
1296 | case CIO_GONE: | |
1297 | vcdev->device_lost = true; | |
1298 | rc = NOTIFY_DONE; | |
1299 | break; | |
fa08a3b4 CB |
1300 | case CIO_OPER: |
1301 | rc = NOTIFY_OK; | |
1302 | break; | |
e75279c4 HG |
1303 | default: |
1304 | rc = NOTIFY_DONE; | |
1305 | break; | |
1306 | } | |
1307 | return rc; | |
7e64e059 CH |
1308 | } |
1309 | ||
1310 | static struct ccw_device_id virtio_ids[] = { | |
1311 | { CCW_DEVICE(0x3832, 0) }, | |
1312 | {}, | |
1313 | }; | |
7e64e059 | 1314 | |
fa08a3b4 CB |
1315 | #ifdef CONFIG_PM_SLEEP |
1316 | static int virtio_ccw_freeze(struct ccw_device *cdev) | |
1317 | { | |
1318 | struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); | |
1319 | ||
1320 | return virtio_device_freeze(&vcdev->vdev); | |
1321 | } | |
1322 | ||
1323 | static int virtio_ccw_restore(struct ccw_device *cdev) | |
1324 | { | |
1325 | struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); | |
1326 | int ret; | |
1327 | ||
1328 | ret = virtio_ccw_set_transport_rev(vcdev); | |
1329 | if (ret) | |
1330 | return ret; | |
1331 | ||
1332 | return virtio_device_restore(&vcdev->vdev); | |
1333 | } | |
1334 | #endif | |
1335 | ||
7e64e059 CH |
1336 | static struct ccw_driver virtio_ccw_driver = { |
1337 | .driver = { | |
1338 | .owner = THIS_MODULE, | |
1339 | .name = "virtio_ccw", | |
1340 | }, | |
1341 | .ids = virtio_ids, | |
1342 | .probe = virtio_ccw_probe, | |
1343 | .remove = virtio_ccw_remove, | |
1344 | .set_offline = virtio_ccw_offline, | |
1345 | .set_online = virtio_ccw_online, | |
1346 | .notify = virtio_ccw_cio_notify, | |
89f88337 | 1347 | .int_class = IRQIO_VIR, |
fa08a3b4 CB |
1348 | #ifdef CONFIG_PM_SLEEP |
1349 | .freeze = virtio_ccw_freeze, | |
1350 | .thaw = virtio_ccw_restore, | |
1351 | .restore = virtio_ccw_restore, | |
1352 | #endif | |
7e64e059 CH |
1353 | }; |
1354 | ||
1355 | static int __init pure_hex(char **cp, unsigned int *val, int min_digit, | |
1356 | int max_digit, int max_val) | |
1357 | { | |
1358 | int diff; | |
1359 | ||
1360 | diff = 0; | |
1361 | *val = 0; | |
1362 | ||
1363 | while (diff <= max_digit) { | |
1364 | int value = hex_to_bin(**cp); | |
1365 | ||
1366 | if (value < 0) | |
1367 | break; | |
1368 | *val = *val * 16 + value; | |
1369 | (*cp)++; | |
1370 | diff++; | |
1371 | } | |
1372 | ||
1373 | if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) | |
1374 | return 1; | |
1375 | ||
1376 | return 0; | |
1377 | } | |
1378 | ||
1379 | static int __init parse_busid(char *str, unsigned int *cssid, | |
1380 | unsigned int *ssid, unsigned int *devno) | |
1381 | { | |
1382 | char *str_work; | |
1383 | int rc, ret; | |
1384 | ||
1385 | rc = 1; | |
1386 | ||
1387 | if (*str == '\0') | |
1388 | goto out; | |
1389 | ||
1390 | str_work = str; | |
1391 | ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); | |
1392 | if (ret || (str_work[0] != '.')) | |
1393 | goto out; | |
1394 | str_work++; | |
1395 | ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); | |
1396 | if (ret || (str_work[0] != '.')) | |
1397 | goto out; | |
1398 | str_work++; | |
1399 | ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); | |
1400 | if (ret || (str_work[0] != '\0')) | |
1401 | goto out; | |
1402 | ||
1403 | rc = 0; | |
1404 | out: | |
1405 | return rc; | |
1406 | } | |
1407 | ||
1408 | static void __init no_auto_parse(void) | |
1409 | { | |
1410 | unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; | |
1411 | char *parm, *str; | |
1412 | int rc; | |
1413 | ||
1414 | str = no_auto; | |
1415 | while ((parm = strsep(&str, ","))) { | |
1416 | rc = parse_busid(strsep(&parm, "-"), &from_cssid, | |
1417 | &from_ssid, &from); | |
1418 | if (rc) | |
1419 | continue; | |
1420 | if (parm != NULL) { | |
1421 | rc = parse_busid(parm, &to_cssid, | |
1422 | &to_ssid, &to); | |
1423 | if ((from_ssid > to_ssid) || | |
1424 | ((from_ssid == to_ssid) && (from > to))) | |
1425 | rc = -EINVAL; | |
1426 | } else { | |
1427 | to_cssid = from_cssid; | |
1428 | to_ssid = from_ssid; | |
1429 | to = from; | |
1430 | } | |
1431 | if (rc) | |
1432 | continue; | |
1433 | while ((from_ssid < to_ssid) || | |
1434 | ((from_ssid == to_ssid) && (from <= to))) { | |
1435 | set_bit(from, devs_no_auto[from_ssid]); | |
1436 | from++; | |
1437 | if (from > __MAX_SUBCHANNEL) { | |
1438 | from_ssid++; | |
1439 | from = 0; | |
1440 | } | |
1441 | } | |
1442 | } | |
1443 | } | |
1444 | ||
1445 | static int __init virtio_ccw_init(void) | |
1446 | { | |
1447 | /* parse no_auto string before we do anything further */ | |
1448 | no_auto_parse(); | |
1449 | return ccw_driver_register(&virtio_ccw_driver); | |
1450 | } | |
acc50ec7 | 1451 | device_initcall(virtio_ccw_init); |