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7e64e059 CH |
1 | /* |
2 | * ccw based virtio transport | |
3 | * | |
96b14536 | 4 | * Copyright IBM Corp. 2012, 2014 |
7e64e059 CH |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License (version 2 only) | |
8 | * as published by the Free Software Foundation. | |
9 | * | |
10 | * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> | |
11 | */ | |
12 | ||
13 | #include <linux/kernel_stat.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/bootmem.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/virtio.h> | |
18 | #include <linux/virtio_config.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/virtio_ring.h> | |
22 | #include <linux/pfn.h> | |
23 | #include <linux/async.h> | |
24 | #include <linux/wait.h> | |
25 | #include <linux/list.h> | |
26 | #include <linux/bitops.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/io.h> | |
29 | #include <linux/kvm_para.h> | |
e75279c4 | 30 | #include <linux/notifier.h> |
7e64e059 CH |
31 | #include <asm/setup.h> |
32 | #include <asm/irq.h> | |
33 | #include <asm/cio.h> | |
34 | #include <asm/ccwdev.h> | |
6a773cb8 | 35 | #include <asm/virtio-ccw.h> |
96b14536 CH |
36 | #include <asm/isc.h> |
37 | #include <asm/airq.h> | |
7e64e059 CH |
38 | |
39 | /* | |
40 | * virtio related functions | |
41 | */ | |
42 | ||
43 | struct vq_config_block { | |
44 | __u16 index; | |
45 | __u16 num; | |
46 | } __packed; | |
47 | ||
48 | #define VIRTIO_CCW_CONFIG_SIZE 0x100 | |
49 | /* same as PCI config space size, should be enough for all drivers */ | |
50 | ||
51 | struct virtio_ccw_device { | |
52 | struct virtio_device vdev; | |
73fa21ea | 53 | __u8 *status; |
7e64e059 CH |
54 | __u8 config[VIRTIO_CCW_CONFIG_SIZE]; |
55 | struct ccw_device *cdev; | |
7e64e059 CH |
56 | __u32 curr_io; |
57 | int err; | |
6bb2c835 | 58 | unsigned int revision; /* Transport revision */ |
7e64e059 CH |
59 | wait_queue_head_t wait_q; |
60 | spinlock_t lock; | |
61 | struct list_head virtqueues; | |
62 | unsigned long indicators; | |
63 | unsigned long indicators2; | |
64 | struct vq_config_block *config_block; | |
96b14536 | 65 | bool is_thinint; |
79629b20 | 66 | bool going_away; |
e75279c4 | 67 | bool device_lost; |
431dae77 | 68 | unsigned int config_ready; |
96b14536 | 69 | void *airq_info; |
7e64e059 CH |
70 | }; |
71 | ||
d4674240 | 72 | struct vq_info_block_legacy { |
7e64e059 CH |
73 | __u64 queue; |
74 | __u32 align; | |
75 | __u16 index; | |
76 | __u16 num; | |
77 | } __packed; | |
78 | ||
d4674240 CH |
79 | struct vq_info_block { |
80 | __u64 desc; | |
81 | __u32 res0; | |
82 | __u16 index; | |
83 | __u16 num; | |
84 | __u64 avail; | |
85 | __u64 used; | |
86 | } __packed; | |
87 | ||
7e64e059 CH |
88 | struct virtio_feature_desc { |
89 | __u32 features; | |
90 | __u8 index; | |
91 | } __packed; | |
92 | ||
96b14536 CH |
93 | struct virtio_thinint_area { |
94 | unsigned long summary_indicator; | |
95 | unsigned long indicator; | |
96 | u64 bit_nr; | |
97 | u8 isc; | |
98 | } __packed; | |
99 | ||
6bb2c835 TH |
100 | struct virtio_rev_info { |
101 | __u16 revision; | |
102 | __u16 length; | |
103 | __u8 data[]; | |
104 | }; | |
105 | ||
106 | /* the highest virtio-ccw revision we support */ | |
af9ca13b | 107 | #define VIRTIO_CCW_REV_MAX 1 |
6bb2c835 | 108 | |
7e64e059 CH |
109 | struct virtio_ccw_vq_info { |
110 | struct virtqueue *vq; | |
111 | int num; | |
112 | void *queue; | |
d4674240 CH |
113 | union { |
114 | struct vq_info_block s; | |
115 | struct vq_info_block_legacy l; | |
116 | } *info_block; | |
96b14536 | 117 | int bit_nr; |
7e64e059 | 118 | struct list_head node; |
07e16933 | 119 | long cookie; |
7e64e059 CH |
120 | }; |
121 | ||
96b14536 CH |
122 | #define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */ |
123 | ||
124 | #define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8) | |
125 | #define MAX_AIRQ_AREAS 20 | |
126 | ||
127 | static int virtio_ccw_use_airq = 1; | |
128 | ||
129 | struct airq_info { | |
130 | rwlock_t lock; | |
131 | u8 summary_indicator; | |
132 | struct airq_struct airq; | |
133 | struct airq_iv *aiv; | |
134 | }; | |
135 | static struct airq_info *airq_areas[MAX_AIRQ_AREAS]; | |
136 | ||
7e64e059 CH |
137 | #define CCW_CMD_SET_VQ 0x13 |
138 | #define CCW_CMD_VDEV_RESET 0x33 | |
139 | #define CCW_CMD_SET_IND 0x43 | |
140 | #define CCW_CMD_SET_CONF_IND 0x53 | |
141 | #define CCW_CMD_READ_FEAT 0x12 | |
142 | #define CCW_CMD_WRITE_FEAT 0x11 | |
143 | #define CCW_CMD_READ_CONF 0x22 | |
144 | #define CCW_CMD_WRITE_CONF 0x21 | |
145 | #define CCW_CMD_WRITE_STATUS 0x31 | |
146 | #define CCW_CMD_READ_VQ_CONF 0x32 | |
96b14536 | 147 | #define CCW_CMD_SET_IND_ADAPTER 0x73 |
6bb2c835 | 148 | #define CCW_CMD_SET_VIRTIO_REV 0x83 |
7e64e059 CH |
149 | |
150 | #define VIRTIO_CCW_DOING_SET_VQ 0x00010000 | |
151 | #define VIRTIO_CCW_DOING_RESET 0x00040000 | |
152 | #define VIRTIO_CCW_DOING_READ_FEAT 0x00080000 | |
153 | #define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000 | |
154 | #define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000 | |
155 | #define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000 | |
156 | #define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000 | |
157 | #define VIRTIO_CCW_DOING_SET_IND 0x01000000 | |
158 | #define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000 | |
159 | #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000 | |
96b14536 | 160 | #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000 |
6bb2c835 | 161 | #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000 |
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 | ||
237 | static void destroy_airq_info(struct airq_info *info) | |
238 | { | |
239 | if (!info) | |
240 | return; | |
241 | ||
242 | unregister_adapter_interrupt(&info->airq); | |
243 | airq_iv_release(info->aiv); | |
244 | kfree(info); | |
245 | } | |
246 | ||
247 | static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs, | |
248 | u64 *first, void **airq_info) | |
249 | { | |
250 | int i, j; | |
251 | struct airq_info *info; | |
252 | unsigned long indicator_addr = 0; | |
253 | unsigned long bit, flags; | |
254 | ||
255 | for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) { | |
256 | if (!airq_areas[i]) | |
257 | airq_areas[i] = new_airq_info(); | |
258 | info = airq_areas[i]; | |
259 | if (!info) | |
260 | return 0; | |
261 | write_lock_irqsave(&info->lock, flags); | |
262 | bit = airq_iv_alloc(info->aiv, nvqs); | |
263 | if (bit == -1UL) { | |
264 | /* Not enough vacancies. */ | |
265 | write_unlock_irqrestore(&info->lock, flags); | |
266 | continue; | |
267 | } | |
268 | *first = bit; | |
269 | *airq_info = info; | |
270 | indicator_addr = (unsigned long)info->aiv->vector; | |
271 | for (j = 0; j < nvqs; j++) { | |
272 | airq_iv_set_ptr(info->aiv, bit + j, | |
273 | (unsigned long)vqs[j]); | |
274 | } | |
275 | write_unlock_irqrestore(&info->lock, flags); | |
276 | } | |
277 | return indicator_addr; | |
278 | } | |
279 | ||
280 | static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev) | |
281 | { | |
282 | struct virtio_ccw_vq_info *info; | |
283 | ||
284 | list_for_each_entry(info, &vcdev->virtqueues, node) | |
285 | drop_airq_indicator(info->vq, vcdev->airq_info); | |
286 | } | |
287 | ||
7e64e059 CH |
288 | static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag) |
289 | { | |
290 | unsigned long flags; | |
291 | __u32 ret; | |
292 | ||
293 | spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); | |
294 | if (vcdev->err) | |
295 | ret = 0; | |
296 | else | |
297 | ret = vcdev->curr_io & flag; | |
298 | spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); | |
299 | return ret; | |
300 | } | |
301 | ||
73fa21ea CH |
302 | static int ccw_io_helper(struct virtio_ccw_device *vcdev, |
303 | struct ccw1 *ccw, __u32 intparm) | |
7e64e059 CH |
304 | { |
305 | int ret; | |
306 | unsigned long flags; | |
307 | int flag = intparm & VIRTIO_CCW_INTPARM_MASK; | |
308 | ||
b26ba22b CB |
309 | do { |
310 | spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); | |
311 | ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0); | |
99437a27 CH |
312 | if (!ret) { |
313 | if (!vcdev->curr_io) | |
314 | vcdev->err = 0; | |
b26ba22b | 315 | vcdev->curr_io |= flag; |
99437a27 | 316 | } |
b26ba22b CB |
317 | spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); |
318 | cpu_relax(); | |
319 | } while (ret == -EBUSY); | |
7e64e059 CH |
320 | wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0); |
321 | return ret ? ret : vcdev->err; | |
322 | } | |
323 | ||
96b14536 CH |
324 | static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev, |
325 | struct ccw1 *ccw) | |
326 | { | |
327 | int ret; | |
328 | unsigned long *indicatorp = NULL; | |
329 | struct virtio_thinint_area *thinint_area = NULL; | |
330 | struct airq_info *airq_info = vcdev->airq_info; | |
331 | ||
332 | if (vcdev->is_thinint) { | |
333 | thinint_area = kzalloc(sizeof(*thinint_area), | |
334 | GFP_DMA | GFP_KERNEL); | |
335 | if (!thinint_area) | |
336 | return; | |
337 | thinint_area->summary_indicator = | |
338 | (unsigned long) &airq_info->summary_indicator; | |
339 | thinint_area->isc = VIRTIO_AIRQ_ISC; | |
340 | ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; | |
341 | ccw->count = sizeof(*thinint_area); | |
342 | ccw->cda = (__u32)(unsigned long) thinint_area; | |
343 | } else { | |
344 | indicatorp = kmalloc(sizeof(&vcdev->indicators), | |
345 | GFP_DMA | GFP_KERNEL); | |
346 | if (!indicatorp) | |
347 | return; | |
348 | *indicatorp = 0; | |
349 | ccw->cmd_code = CCW_CMD_SET_IND; | |
350 | ccw->count = sizeof(vcdev->indicators); | |
351 | ccw->cda = (__u32)(unsigned long) indicatorp; | |
352 | } | |
353 | /* Deregister indicators from host. */ | |
354 | vcdev->indicators = 0; | |
355 | ccw->flags = 0; | |
356 | ret = ccw_io_helper(vcdev, ccw, | |
357 | vcdev->is_thinint ? | |
358 | VIRTIO_CCW_DOING_SET_IND_ADAPTER : | |
359 | VIRTIO_CCW_DOING_SET_IND); | |
360 | if (ret && (ret != -ENODEV)) | |
361 | dev_info(&vcdev->cdev->dev, | |
362 | "Failed to deregister indicators (%d)\n", ret); | |
363 | else if (vcdev->is_thinint) | |
364 | virtio_ccw_drop_indicators(vcdev); | |
365 | kfree(indicatorp); | |
366 | kfree(thinint_area); | |
367 | } | |
368 | ||
7e64e059 | 369 | static inline long do_kvm_notify(struct subchannel_id schid, |
07e16933 MT |
370 | unsigned long queue_index, |
371 | long cookie) | |
7e64e059 CH |
372 | { |
373 | register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY; | |
374 | register struct subchannel_id __schid asm("2") = schid; | |
375 | register unsigned long __index asm("3") = queue_index; | |
376 | register long __rc asm("2"); | |
07e16933 | 377 | register long __cookie asm("4") = cookie; |
7e64e059 CH |
378 | |
379 | asm volatile ("diag 2,4,0x500\n" | |
07e16933 MT |
380 | : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index), |
381 | "d"(__cookie) | |
7e64e059 CH |
382 | : "memory", "cc"); |
383 | return __rc; | |
384 | } | |
385 | ||
46f9c2b9 | 386 | static bool virtio_ccw_kvm_notify(struct virtqueue *vq) |
7e64e059 CH |
387 | { |
388 | struct virtio_ccw_vq_info *info = vq->priv; | |
389 | struct virtio_ccw_device *vcdev; | |
390 | struct subchannel_id schid; | |
391 | ||
392 | vcdev = to_vc_device(info->vq->vdev); | |
393 | ccw_device_get_schid(vcdev->cdev, &schid); | |
01227a88 | 394 | info->cookie = do_kvm_notify(schid, vq->index, info->cookie); |
46f9c2b9 HG |
395 | if (info->cookie < 0) |
396 | return false; | |
397 | return true; | |
7e64e059 CH |
398 | } |
399 | ||
73fa21ea CH |
400 | static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, |
401 | struct ccw1 *ccw, int index) | |
7e64e059 CH |
402 | { |
403 | vcdev->config_block->index = index; | |
73fa21ea CH |
404 | ccw->cmd_code = CCW_CMD_READ_VQ_CONF; |
405 | ccw->flags = 0; | |
406 | ccw->count = sizeof(struct vq_config_block); | |
407 | ccw->cda = (__u32)(unsigned long)(vcdev->config_block); | |
408 | ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF); | |
7e64e059 CH |
409 | return vcdev->config_block->num; |
410 | } | |
411 | ||
73fa21ea | 412 | static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw) |
7e64e059 CH |
413 | { |
414 | struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev); | |
415 | struct virtio_ccw_vq_info *info = vq->priv; | |
416 | unsigned long flags; | |
417 | unsigned long size; | |
418 | int ret; | |
9d0ca6ed | 419 | unsigned int index = vq->index; |
7e64e059 CH |
420 | |
421 | /* Remove from our list. */ | |
422 | spin_lock_irqsave(&vcdev->lock, flags); | |
423 | list_del(&info->node); | |
424 | spin_unlock_irqrestore(&vcdev->lock, flags); | |
425 | ||
426 | /* Release from host. */ | |
d4674240 CH |
427 | if (vcdev->revision == 0) { |
428 | info->info_block->l.queue = 0; | |
429 | info->info_block->l.align = 0; | |
430 | info->info_block->l.index = index; | |
431 | info->info_block->l.num = 0; | |
432 | ccw->count = sizeof(info->info_block->l); | |
433 | } else { | |
434 | info->info_block->s.desc = 0; | |
435 | info->info_block->s.index = index; | |
436 | info->info_block->s.num = 0; | |
437 | info->info_block->s.avail = 0; | |
438 | info->info_block->s.used = 0; | |
439 | ccw->count = sizeof(info->info_block->s); | |
440 | } | |
73fa21ea CH |
441 | ccw->cmd_code = CCW_CMD_SET_VQ; |
442 | ccw->flags = 0; | |
73fa21ea CH |
443 | ccw->cda = (__u32)(unsigned long)(info->info_block); |
444 | ret = ccw_io_helper(vcdev, ccw, | |
445 | VIRTIO_CCW_DOING_SET_VQ | index); | |
7e64e059 CH |
446 | /* |
447 | * -ENODEV isn't considered an error: The device is gone anyway. | |
448 | * This may happen on device detach. | |
449 | */ | |
450 | if (ret && (ret != -ENODEV)) | |
451 | dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d", | |
452 | ret, index); | |
453 | ||
454 | vring_del_virtqueue(vq); | |
455 | size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN)); | |
456 | free_pages_exact(info->queue, size); | |
457 | kfree(info->info_block); | |
458 | kfree(info); | |
459 | } | |
460 | ||
461 | static void virtio_ccw_del_vqs(struct virtio_device *vdev) | |
462 | { | |
463 | struct virtqueue *vq, *n; | |
73fa21ea | 464 | struct ccw1 *ccw; |
96b14536 | 465 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
73fa21ea CH |
466 | |
467 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); | |
468 | if (!ccw) | |
469 | return; | |
470 | ||
96b14536 | 471 | virtio_ccw_drop_indicator(vcdev, ccw); |
7e64e059 CH |
472 | |
473 | list_for_each_entry_safe(vq, n, &vdev->vqs, list) | |
73fa21ea CH |
474 | virtio_ccw_del_vq(vq, ccw); |
475 | ||
476 | kfree(ccw); | |
7e64e059 CH |
477 | } |
478 | ||
479 | static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, | |
480 | int i, vq_callback_t *callback, | |
73fa21ea CH |
481 | const char *name, |
482 | struct ccw1 *ccw) | |
7e64e059 CH |
483 | { |
484 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
485 | int err; | |
c98d3683 | 486 | struct virtqueue *vq = NULL; |
7e64e059 | 487 | struct virtio_ccw_vq_info *info; |
c98d3683 | 488 | unsigned long size = 0; /* silence the compiler */ |
7e64e059 CH |
489 | unsigned long flags; |
490 | ||
491 | /* Allocate queue. */ | |
492 | info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL); | |
493 | if (!info) { | |
494 | dev_warn(&vcdev->cdev->dev, "no info\n"); | |
495 | err = -ENOMEM; | |
496 | goto out_err; | |
497 | } | |
498 | info->info_block = kzalloc(sizeof(*info->info_block), | |
499 | GFP_DMA | GFP_KERNEL); | |
500 | if (!info->info_block) { | |
501 | dev_warn(&vcdev->cdev->dev, "no info block\n"); | |
502 | err = -ENOMEM; | |
503 | goto out_err; | |
504 | } | |
73fa21ea | 505 | info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i); |
7e64e059 CH |
506 | size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN)); |
507 | info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO); | |
508 | if (info->queue == NULL) { | |
509 | dev_warn(&vcdev->cdev->dev, "no queue\n"); | |
510 | err = -ENOMEM; | |
511 | goto out_err; | |
512 | } | |
513 | ||
514 | vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev, | |
515 | true, info->queue, virtio_ccw_kvm_notify, | |
516 | callback, name); | |
517 | if (!vq) { | |
518 | /* For now, we fail if we can't get the requested size. */ | |
519 | dev_warn(&vcdev->cdev->dev, "no vq\n"); | |
520 | err = -ENOMEM; | |
7e64e059 CH |
521 | goto out_err; |
522 | } | |
7e64e059 CH |
523 | |
524 | /* Register it with the host. */ | |
d4674240 CH |
525 | if (vcdev->revision == 0) { |
526 | info->info_block->l.queue = (__u64)info->queue; | |
527 | info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN; | |
528 | info->info_block->l.index = i; | |
529 | info->info_block->l.num = info->num; | |
530 | ccw->count = sizeof(info->info_block->l); | |
531 | } else { | |
532 | info->info_block->s.desc = (__u64)info->queue; | |
533 | info->info_block->s.index = i; | |
534 | info->info_block->s.num = info->num; | |
535 | info->info_block->s.avail = (__u64)virtqueue_get_avail(vq); | |
536 | info->info_block->s.used = (__u64)virtqueue_get_used(vq); | |
537 | ccw->count = sizeof(info->info_block->s); | |
538 | } | |
73fa21ea CH |
539 | ccw->cmd_code = CCW_CMD_SET_VQ; |
540 | ccw->flags = 0; | |
73fa21ea CH |
541 | ccw->cda = (__u32)(unsigned long)(info->info_block); |
542 | err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i); | |
7e64e059 CH |
543 | if (err) { |
544 | dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n"); | |
7e64e059 CH |
545 | goto out_err; |
546 | } | |
547 | ||
c98d3683 CH |
548 | info->vq = vq; |
549 | vq->priv = info; | |
550 | ||
7e64e059 CH |
551 | /* Save it to our list. */ |
552 | spin_lock_irqsave(&vcdev->lock, flags); | |
553 | list_add(&info->node, &vcdev->virtqueues); | |
554 | spin_unlock_irqrestore(&vcdev->lock, flags); | |
555 | ||
556 | return vq; | |
557 | ||
558 | out_err: | |
c98d3683 CH |
559 | if (vq) |
560 | vring_del_virtqueue(vq); | |
561 | if (info) { | |
562 | if (info->queue) | |
563 | free_pages_exact(info->queue, size); | |
7e64e059 | 564 | kfree(info->info_block); |
c98d3683 | 565 | } |
7e64e059 CH |
566 | kfree(info); |
567 | return ERR_PTR(err); | |
568 | } | |
569 | ||
96b14536 CH |
570 | static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev, |
571 | struct virtqueue *vqs[], int nvqs, | |
572 | struct ccw1 *ccw) | |
573 | { | |
574 | int ret; | |
575 | struct virtio_thinint_area *thinint_area = NULL; | |
576 | struct airq_info *info; | |
577 | ||
578 | thinint_area = kzalloc(sizeof(*thinint_area), GFP_DMA | GFP_KERNEL); | |
579 | if (!thinint_area) { | |
580 | ret = -ENOMEM; | |
581 | goto out; | |
582 | } | |
583 | /* Try to get an indicator. */ | |
584 | thinint_area->indicator = get_airq_indicator(vqs, nvqs, | |
585 | &thinint_area->bit_nr, | |
586 | &vcdev->airq_info); | |
587 | if (!thinint_area->indicator) { | |
588 | ret = -ENOSPC; | |
589 | goto out; | |
590 | } | |
591 | info = vcdev->airq_info; | |
592 | thinint_area->summary_indicator = | |
593 | (unsigned long) &info->summary_indicator; | |
594 | thinint_area->isc = VIRTIO_AIRQ_ISC; | |
595 | ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; | |
596 | ccw->flags = CCW_FLAG_SLI; | |
597 | ccw->count = sizeof(*thinint_area); | |
598 | ccw->cda = (__u32)(unsigned long)thinint_area; | |
599 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER); | |
600 | if (ret) { | |
601 | if (ret == -EOPNOTSUPP) { | |
602 | /* | |
603 | * The host does not support adapter interrupts | |
604 | * for virtio-ccw, stop trying. | |
605 | */ | |
606 | virtio_ccw_use_airq = 0; | |
607 | pr_info("Adapter interrupts unsupported on host\n"); | |
608 | } else | |
609 | dev_warn(&vcdev->cdev->dev, | |
610 | "enabling adapter interrupts = %d\n", ret); | |
611 | virtio_ccw_drop_indicators(vcdev); | |
612 | } | |
613 | out: | |
614 | kfree(thinint_area); | |
615 | return ret; | |
616 | } | |
617 | ||
7e64e059 CH |
618 | static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, |
619 | struct virtqueue *vqs[], | |
620 | vq_callback_t *callbacks[], | |
621 | const char *names[]) | |
622 | { | |
623 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
624 | unsigned long *indicatorp = NULL; | |
625 | int ret, i; | |
73fa21ea CH |
626 | struct ccw1 *ccw; |
627 | ||
628 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); | |
629 | if (!ccw) | |
630 | return -ENOMEM; | |
7e64e059 CH |
631 | |
632 | for (i = 0; i < nvqs; ++i) { | |
73fa21ea CH |
633 | vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i], |
634 | ccw); | |
7e64e059 CH |
635 | if (IS_ERR(vqs[i])) { |
636 | ret = PTR_ERR(vqs[i]); | |
637 | vqs[i] = NULL; | |
638 | goto out; | |
639 | } | |
640 | } | |
641 | ret = -ENOMEM; | |
642 | /* We need a data area under 2G to communicate. */ | |
643 | indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL); | |
644 | if (!indicatorp) | |
645 | goto out; | |
646 | *indicatorp = (unsigned long) &vcdev->indicators; | |
96b14536 CH |
647 | if (vcdev->is_thinint) { |
648 | ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); | |
649 | if (ret) | |
650 | /* no error, just fall back to legacy interrupts */ | |
651 | vcdev->is_thinint = 0; | |
652 | } | |
653 | if (!vcdev->is_thinint) { | |
654 | /* Register queue indicators with host. */ | |
655 | vcdev->indicators = 0; | |
656 | ccw->cmd_code = CCW_CMD_SET_IND; | |
657 | ccw->flags = 0; | |
658 | ccw->count = sizeof(vcdev->indicators); | |
659 | ccw->cda = (__u32)(unsigned long) indicatorp; | |
660 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); | |
661 | if (ret) | |
662 | goto out; | |
663 | } | |
7e64e059 CH |
664 | /* Register indicators2 with host for config changes */ |
665 | *indicatorp = (unsigned long) &vcdev->indicators2; | |
666 | vcdev->indicators2 = 0; | |
73fa21ea CH |
667 | ccw->cmd_code = CCW_CMD_SET_CONF_IND; |
668 | ccw->flags = 0; | |
669 | ccw->count = sizeof(vcdev->indicators2); | |
670 | ccw->cda = (__u32)(unsigned long) indicatorp; | |
671 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); | |
7e64e059 CH |
672 | if (ret) |
673 | goto out; | |
674 | ||
675 | kfree(indicatorp); | |
73fa21ea | 676 | kfree(ccw); |
7e64e059 CH |
677 | return 0; |
678 | out: | |
679 | kfree(indicatorp); | |
73fa21ea | 680 | kfree(ccw); |
7e64e059 CH |
681 | virtio_ccw_del_vqs(vdev); |
682 | return ret; | |
683 | } | |
684 | ||
685 | static void virtio_ccw_reset(struct virtio_device *vdev) | |
686 | { | |
687 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
73fa21ea CH |
688 | struct ccw1 *ccw; |
689 | ||
690 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); | |
691 | if (!ccw) | |
692 | return; | |
7e64e059 CH |
693 | |
694 | /* Zero status bits. */ | |
73fa21ea | 695 | *vcdev->status = 0; |
7e64e059 CH |
696 | |
697 | /* Send a reset ccw on device. */ | |
73fa21ea CH |
698 | ccw->cmd_code = CCW_CMD_VDEV_RESET; |
699 | ccw->flags = 0; | |
700 | ccw->count = 0; | |
701 | ccw->cda = 0; | |
702 | ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); | |
703 | kfree(ccw); | |
7e64e059 CH |
704 | } |
705 | ||
d0254773 | 706 | static u64 virtio_ccw_get_features(struct virtio_device *vdev) |
7e64e059 CH |
707 | { |
708 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
73fa21ea | 709 | struct virtio_feature_desc *features; |
732c56e9 MT |
710 | int ret; |
711 | u64 rc; | |
73fa21ea | 712 | struct ccw1 *ccw; |
7e64e059 | 713 | |
73fa21ea CH |
714 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); |
715 | if (!ccw) | |
716 | return 0; | |
717 | ||
718 | features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); | |
719 | if (!features) { | |
720 | rc = 0; | |
721 | goto out_free; | |
722 | } | |
7e64e059 | 723 | /* Read the feature bits from the host. */ |
73fa21ea CH |
724 | features->index = 0; |
725 | ccw->cmd_code = CCW_CMD_READ_FEAT; | |
726 | ccw->flags = 0; | |
727 | ccw->count = sizeof(*features); | |
728 | ccw->cda = (__u32)(unsigned long)features; | |
729 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); | |
730 | if (ret) { | |
731 | rc = 0; | |
732 | goto out_free; | |
733 | } | |
734 | ||
735 | rc = le32_to_cpu(features->features); | |
7e64e059 | 736 | |
ce15408f MT |
737 | if (vcdev->revision == 0) |
738 | goto out_free; | |
739 | ||
732c56e9 MT |
740 | /* Read second half of the feature bits from the host. */ |
741 | features->index = 1; | |
742 | ccw->cmd_code = CCW_CMD_READ_FEAT; | |
743 | ccw->flags = 0; | |
744 | ccw->count = sizeof(*features); | |
745 | ccw->cda = (__u32)(unsigned long)features; | |
746 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); | |
747 | if (ret == 0) | |
748 | rc |= (u64)le32_to_cpu(features->features) << 32; | |
749 | ||
73fa21ea CH |
750 | out_free: |
751 | kfree(features); | |
752 | kfree(ccw); | |
753 | return rc; | |
7e64e059 CH |
754 | } |
755 | ||
5c609a5e | 756 | static int virtio_ccw_finalize_features(struct virtio_device *vdev) |
7e64e059 CH |
757 | { |
758 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
73fa21ea | 759 | struct virtio_feature_desc *features; |
73fa21ea | 760 | struct ccw1 *ccw; |
f01a2a81 | 761 | int ret; |
73fa21ea | 762 | |
f13d8bc2 | 763 | if (vcdev->revision >= 1 && |
4d23676f MT |
764 | !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { |
765 | dev_err(&vdev->dev, "virtio: device uses revision 1 " | |
766 | "but does not have VIRTIO_F_VERSION_1\n"); | |
767 | return -EINVAL; | |
768 | } | |
769 | ||
73fa21ea CH |
770 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); |
771 | if (!ccw) | |
f01a2a81 | 772 | return -ENOMEM; |
73fa21ea CH |
773 | |
774 | features = kzalloc(sizeof(*features), GFP_DMA | GFP_KERNEL); | |
f01a2a81 CH |
775 | if (!features) { |
776 | ret = -ENOMEM; | |
73fa21ea | 777 | goto out_free; |
f01a2a81 | 778 | } |
7e64e059 CH |
779 | /* Give virtio_ring a chance to accept features. */ |
780 | vring_transport_features(vdev); | |
781 | ||
e16e12be | 782 | features->index = 0; |
732c56e9 MT |
783 | features->features = cpu_to_le32((u32)vdev->features); |
784 | /* Write the first half of the feature bits to the host. */ | |
785 | ccw->cmd_code = CCW_CMD_WRITE_FEAT; | |
786 | ccw->flags = 0; | |
787 | ccw->count = sizeof(*features); | |
788 | ccw->cda = (__u32)(unsigned long)features; | |
f01a2a81 CH |
789 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); |
790 | if (ret) | |
791 | goto out_free; | |
732c56e9 | 792 | |
ce15408f MT |
793 | if (vcdev->revision == 0) |
794 | goto out_free; | |
795 | ||
732c56e9 MT |
796 | features->index = 1; |
797 | features->features = cpu_to_le32(vdev->features >> 32); | |
798 | /* Write the second half of the feature bits to the host. */ | |
e16e12be MT |
799 | ccw->cmd_code = CCW_CMD_WRITE_FEAT; |
800 | ccw->flags = 0; | |
801 | ccw->count = sizeof(*features); | |
802 | ccw->cda = (__u32)(unsigned long)features; | |
f01a2a81 | 803 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); |
e16e12be | 804 | |
73fa21ea CH |
805 | out_free: |
806 | kfree(features); | |
807 | kfree(ccw); | |
5c609a5e | 808 | |
f01a2a81 | 809 | return ret; |
7e64e059 CH |
810 | } |
811 | ||
812 | static void virtio_ccw_get_config(struct virtio_device *vdev, | |
813 | unsigned int offset, void *buf, unsigned len) | |
814 | { | |
815 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
816 | int ret; | |
73fa21ea CH |
817 | struct ccw1 *ccw; |
818 | void *config_area; | |
819 | ||
820 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); | |
821 | if (!ccw) | |
822 | return; | |
823 | ||
824 | config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); | |
825 | if (!config_area) | |
826 | goto out_free; | |
7e64e059 CH |
827 | |
828 | /* Read the config area from the host. */ | |
73fa21ea CH |
829 | ccw->cmd_code = CCW_CMD_READ_CONF; |
830 | ccw->flags = 0; | |
831 | ccw->count = offset + len; | |
832 | ccw->cda = (__u32)(unsigned long)config_area; | |
833 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); | |
7e64e059 | 834 | if (ret) |
73fa21ea | 835 | goto out_free; |
7e64e059 | 836 | |
431dae77 CH |
837 | memcpy(vcdev->config, config_area, offset + len); |
838 | if (buf) | |
839 | memcpy(buf, &vcdev->config[offset], len); | |
840 | if (vcdev->config_ready < offset + len) | |
841 | vcdev->config_ready = offset + len; | |
73fa21ea CH |
842 | |
843 | out_free: | |
844 | kfree(config_area); | |
845 | kfree(ccw); | |
7e64e059 CH |
846 | } |
847 | ||
848 | static void virtio_ccw_set_config(struct virtio_device *vdev, | |
849 | unsigned int offset, const void *buf, | |
850 | unsigned len) | |
851 | { | |
852 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
73fa21ea CH |
853 | struct ccw1 *ccw; |
854 | void *config_area; | |
855 | ||
856 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); | |
857 | if (!ccw) | |
858 | return; | |
859 | ||
860 | config_area = kzalloc(VIRTIO_CCW_CONFIG_SIZE, GFP_DMA | GFP_KERNEL); | |
861 | if (!config_area) | |
862 | goto out_free; | |
7e64e059 | 863 | |
431dae77 CH |
864 | /* Make sure we don't overwrite fields. */ |
865 | if (vcdev->config_ready < offset) | |
866 | virtio_ccw_get_config(vdev, 0, NULL, offset); | |
7e64e059 CH |
867 | memcpy(&vcdev->config[offset], buf, len); |
868 | /* Write the config area to the host. */ | |
73fa21ea CH |
869 | memcpy(config_area, vcdev->config, sizeof(vcdev->config)); |
870 | ccw->cmd_code = CCW_CMD_WRITE_CONF; | |
871 | ccw->flags = 0; | |
872 | ccw->count = offset + len; | |
873 | ccw->cda = (__u32)(unsigned long)config_area; | |
874 | ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); | |
875 | ||
876 | out_free: | |
877 | kfree(config_area); | |
878 | kfree(ccw); | |
7e64e059 CH |
879 | } |
880 | ||
881 | static u8 virtio_ccw_get_status(struct virtio_device *vdev) | |
882 | { | |
883 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
884 | ||
73fa21ea | 885 | return *vcdev->status; |
7e64e059 CH |
886 | } |
887 | ||
888 | static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) | |
889 | { | |
890 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
48555136 | 891 | u8 old_status = *vcdev->status; |
73fa21ea | 892 | struct ccw1 *ccw; |
48555136 | 893 | int ret; |
73fa21ea CH |
894 | |
895 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); | |
896 | if (!ccw) | |
897 | return; | |
7e64e059 CH |
898 | |
899 | /* Write the status to the host. */ | |
73fa21ea CH |
900 | *vcdev->status = status; |
901 | ccw->cmd_code = CCW_CMD_WRITE_STATUS; | |
902 | ccw->flags = 0; | |
903 | ccw->count = sizeof(status); | |
904 | ccw->cda = (__u32)(unsigned long)vcdev->status; | |
48555136 MT |
905 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); |
906 | /* Write failed? We assume status is unchanged. */ | |
907 | if (ret) | |
908 | *vcdev->status = old_status; | |
73fa21ea | 909 | kfree(ccw); |
7e64e059 CH |
910 | } |
911 | ||
912 | static struct virtio_config_ops virtio_ccw_config_ops = { | |
913 | .get_features = virtio_ccw_get_features, | |
914 | .finalize_features = virtio_ccw_finalize_features, | |
915 | .get = virtio_ccw_get_config, | |
916 | .set = virtio_ccw_set_config, | |
917 | .get_status = virtio_ccw_get_status, | |
918 | .set_status = virtio_ccw_set_status, | |
919 | .reset = virtio_ccw_reset, | |
920 | .find_vqs = virtio_ccw_find_vqs, | |
921 | .del_vqs = virtio_ccw_del_vqs, | |
922 | }; | |
923 | ||
924 | ||
925 | /* | |
926 | * ccw bus driver related functions | |
927 | */ | |
928 | ||
929 | static void virtio_ccw_release_dev(struct device *_d) | |
930 | { | |
931 | struct virtio_device *dev = container_of(_d, struct virtio_device, | |
932 | dev); | |
933 | struct virtio_ccw_device *vcdev = to_vc_device(dev); | |
934 | ||
73fa21ea | 935 | kfree(vcdev->status); |
7e64e059 | 936 | kfree(vcdev->config_block); |
7e64e059 CH |
937 | kfree(vcdev); |
938 | } | |
939 | ||
940 | static int irb_is_error(struct irb *irb) | |
941 | { | |
942 | if (scsw_cstat(&irb->scsw) != 0) | |
943 | return 1; | |
944 | if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) | |
945 | return 1; | |
946 | if (scsw_cc(&irb->scsw) != 0) | |
947 | return 1; | |
948 | return 0; | |
949 | } | |
950 | ||
951 | static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, | |
952 | int index) | |
953 | { | |
954 | struct virtio_ccw_vq_info *info; | |
955 | unsigned long flags; | |
956 | struct virtqueue *vq; | |
957 | ||
958 | vq = NULL; | |
959 | spin_lock_irqsave(&vcdev->lock, flags); | |
960 | list_for_each_entry(info, &vcdev->virtqueues, node) { | |
9d0ca6ed | 961 | if (info->vq->index == index) { |
7e64e059 CH |
962 | vq = info->vq; |
963 | break; | |
964 | } | |
965 | } | |
966 | spin_unlock_irqrestore(&vcdev->lock, flags); | |
967 | return vq; | |
968 | } | |
969 | ||
970 | static void virtio_ccw_int_handler(struct ccw_device *cdev, | |
971 | unsigned long intparm, | |
972 | struct irb *irb) | |
973 | { | |
974 | __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; | |
975 | struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); | |
976 | int i; | |
977 | struct virtqueue *vq; | |
7e64e059 | 978 | |
2e021043 HG |
979 | if (!vcdev) |
980 | return; | |
7e64e059 CH |
981 | /* Check if it's a notification from the host. */ |
982 | if ((intparm == 0) && | |
983 | (scsw_stctl(&irb->scsw) == | |
984 | (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { | |
985 | /* OK */ | |
986 | } | |
19e4735b CH |
987 | if (irb_is_error(irb)) { |
988 | /* Command reject? */ | |
989 | if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && | |
990 | (irb->ecw[0] & SNS0_CMD_REJECT)) | |
991 | vcdev->err = -EOPNOTSUPP; | |
992 | else | |
993 | /* Map everything else to -EIO. */ | |
994 | vcdev->err = -EIO; | |
995 | } | |
7e64e059 CH |
996 | if (vcdev->curr_io & activity) { |
997 | switch (activity) { | |
998 | case VIRTIO_CCW_DOING_READ_FEAT: | |
999 | case VIRTIO_CCW_DOING_WRITE_FEAT: | |
1000 | case VIRTIO_CCW_DOING_READ_CONFIG: | |
1001 | case VIRTIO_CCW_DOING_WRITE_CONFIG: | |
1002 | case VIRTIO_CCW_DOING_WRITE_STATUS: | |
1003 | case VIRTIO_CCW_DOING_SET_VQ: | |
1004 | case VIRTIO_CCW_DOING_SET_IND: | |
1005 | case VIRTIO_CCW_DOING_SET_CONF_IND: | |
1006 | case VIRTIO_CCW_DOING_RESET: | |
1007 | case VIRTIO_CCW_DOING_READ_VQ_CONF: | |
96b14536 | 1008 | case VIRTIO_CCW_DOING_SET_IND_ADAPTER: |
6bb2c835 | 1009 | case VIRTIO_CCW_DOING_SET_VIRTIO_REV: |
7e64e059 CH |
1010 | vcdev->curr_io &= ~activity; |
1011 | wake_up(&vcdev->wait_q); | |
1012 | break; | |
1013 | default: | |
1014 | /* don't know what to do... */ | |
1015 | dev_warn(&cdev->dev, "Suspicious activity '%08x'\n", | |
1016 | activity); | |
1017 | WARN_ON(1); | |
1018 | break; | |
1019 | } | |
1020 | } | |
1021 | for_each_set_bit(i, &vcdev->indicators, | |
1022 | sizeof(vcdev->indicators) * BITS_PER_BYTE) { | |
1023 | /* The bit clear must happen before the vring kick. */ | |
1024 | clear_bit(i, &vcdev->indicators); | |
1025 | barrier(); | |
1026 | vq = virtio_ccw_vq_by_ind(vcdev, i); | |
1027 | vring_interrupt(0, vq); | |
1028 | } | |
1029 | if (test_bit(0, &vcdev->indicators2)) { | |
016c98c6 | 1030 | virtio_config_changed(&vcdev->vdev); |
7e64e059 CH |
1031 | clear_bit(0, &vcdev->indicators2); |
1032 | } | |
1033 | } | |
1034 | ||
1035 | /* | |
1036 | * We usually want to autoonline all devices, but give the admin | |
1037 | * a way to exempt devices from this. | |
1038 | */ | |
1039 | #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ | |
1040 | (8*sizeof(long))) | |
1041 | static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; | |
1042 | ||
1043 | static char *no_auto = ""; | |
1044 | ||
1045 | module_param(no_auto, charp, 0444); | |
1046 | MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); | |
1047 | ||
1048 | static int virtio_ccw_check_autoonline(struct ccw_device *cdev) | |
1049 | { | |
1050 | struct ccw_dev_id id; | |
1051 | ||
1052 | ccw_device_get_id(cdev, &id); | |
1053 | if (test_bit(id.devno, devs_no_auto[id.ssid])) | |
1054 | return 0; | |
1055 | return 1; | |
1056 | } | |
1057 | ||
1058 | static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) | |
1059 | { | |
1060 | struct ccw_device *cdev = data; | |
1061 | int ret; | |
1062 | ||
1063 | ret = ccw_device_set_online(cdev); | |
1064 | if (ret) | |
1065 | dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); | |
1066 | } | |
1067 | ||
1068 | static int virtio_ccw_probe(struct ccw_device *cdev) | |
1069 | { | |
1070 | cdev->handler = virtio_ccw_int_handler; | |
1071 | ||
1072 | if (virtio_ccw_check_autoonline(cdev)) | |
1073 | async_schedule(virtio_ccw_auto_online, cdev); | |
1074 | return 0; | |
1075 | } | |
1076 | ||
2e021043 HG |
1077 | static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) |
1078 | { | |
1079 | unsigned long flags; | |
1080 | struct virtio_ccw_device *vcdev; | |
1081 | ||
1082 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1083 | vcdev = dev_get_drvdata(&cdev->dev); | |
79629b20 | 1084 | if (!vcdev || vcdev->going_away) { |
2e021043 HG |
1085 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
1086 | return NULL; | |
1087 | } | |
79629b20 | 1088 | vcdev->going_away = true; |
2e021043 HG |
1089 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
1090 | return vcdev; | |
1091 | } | |
1092 | ||
7e64e059 CH |
1093 | static void virtio_ccw_remove(struct ccw_device *cdev) |
1094 | { | |
79629b20 | 1095 | unsigned long flags; |
2e021043 | 1096 | struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); |
7e64e059 | 1097 | |
e75279c4 HG |
1098 | if (vcdev && cdev->online) { |
1099 | if (vcdev->device_lost) | |
1100 | virtio_break_device(&vcdev->vdev); | |
7e64e059 | 1101 | unregister_virtio_device(&vcdev->vdev); |
e75279c4 HG |
1102 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
1103 | dev_set_drvdata(&cdev->dev, NULL); | |
1104 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1105 | } | |
7e64e059 CH |
1106 | cdev->handler = NULL; |
1107 | } | |
1108 | ||
1109 | static int virtio_ccw_offline(struct ccw_device *cdev) | |
1110 | { | |
79629b20 | 1111 | unsigned long flags; |
2e021043 | 1112 | struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); |
7e64e059 | 1113 | |
e75279c4 HG |
1114 | if (!vcdev) |
1115 | return 0; | |
1116 | if (vcdev->device_lost) | |
1117 | virtio_break_device(&vcdev->vdev); | |
1118 | unregister_virtio_device(&vcdev->vdev); | |
1119 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1120 | dev_set_drvdata(&cdev->dev, NULL); | |
1121 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
7e64e059 CH |
1122 | return 0; |
1123 | } | |
1124 | ||
6bb2c835 TH |
1125 | static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) |
1126 | { | |
1127 | struct virtio_rev_info *rev; | |
1128 | struct ccw1 *ccw; | |
1129 | int ret; | |
1130 | ||
1131 | ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); | |
1132 | if (!ccw) | |
1133 | return -ENOMEM; | |
1134 | rev = kzalloc(sizeof(*rev), GFP_DMA | GFP_KERNEL); | |
1135 | if (!rev) { | |
1136 | kfree(ccw); | |
1137 | return -ENOMEM; | |
1138 | } | |
1139 | ||
1140 | /* Set transport revision */ | |
1141 | ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; | |
1142 | ccw->flags = 0; | |
1143 | ccw->count = sizeof(*rev); | |
1144 | ccw->cda = (__u32)(unsigned long)rev; | |
1145 | ||
1146 | vcdev->revision = VIRTIO_CCW_REV_MAX; | |
1147 | do { | |
1148 | rev->revision = vcdev->revision; | |
1149 | /* none of our supported revisions carry payload */ | |
1150 | rev->length = 0; | |
1151 | ret = ccw_io_helper(vcdev, ccw, | |
1152 | VIRTIO_CCW_DOING_SET_VIRTIO_REV); | |
1153 | if (ret == -EOPNOTSUPP) { | |
1154 | if (vcdev->revision == 0) | |
1155 | /* | |
1156 | * The host device does not support setting | |
1157 | * the revision: let's operate it in legacy | |
1158 | * mode. | |
1159 | */ | |
1160 | ret = 0; | |
1161 | else | |
1162 | vcdev->revision--; | |
1163 | } | |
1164 | } while (ret == -EOPNOTSUPP); | |
1165 | ||
1166 | kfree(ccw); | |
1167 | kfree(rev); | |
1168 | return ret; | |
1169 | } | |
7e64e059 | 1170 | |
7e64e059 CH |
1171 | static int virtio_ccw_online(struct ccw_device *cdev) |
1172 | { | |
1173 | int ret; | |
1174 | struct virtio_ccw_device *vcdev; | |
2e021043 | 1175 | unsigned long flags; |
7e64e059 CH |
1176 | |
1177 | vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); | |
1178 | if (!vcdev) { | |
1179 | dev_warn(&cdev->dev, "Could not get memory for virtio\n"); | |
1180 | ret = -ENOMEM; | |
1181 | goto out_free; | |
1182 | } | |
7e64e059 CH |
1183 | vcdev->config_block = kzalloc(sizeof(*vcdev->config_block), |
1184 | GFP_DMA | GFP_KERNEL); | |
1185 | if (!vcdev->config_block) { | |
1186 | ret = -ENOMEM; | |
1187 | goto out_free; | |
1188 | } | |
73fa21ea CH |
1189 | vcdev->status = kzalloc(sizeof(*vcdev->status), GFP_DMA | GFP_KERNEL); |
1190 | if (!vcdev->status) { | |
7e64e059 CH |
1191 | ret = -ENOMEM; |
1192 | goto out_free; | |
1193 | } | |
1194 | ||
96b14536 CH |
1195 | vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ |
1196 | ||
7e64e059 CH |
1197 | vcdev->vdev.dev.parent = &cdev->dev; |
1198 | vcdev->vdev.dev.release = virtio_ccw_release_dev; | |
1199 | vcdev->vdev.config = &virtio_ccw_config_ops; | |
1200 | vcdev->cdev = cdev; | |
1201 | init_waitqueue_head(&vcdev->wait_q); | |
1202 | INIT_LIST_HEAD(&vcdev->virtqueues); | |
1203 | spin_lock_init(&vcdev->lock); | |
1204 | ||
2e021043 | 1205 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
7e64e059 | 1206 | dev_set_drvdata(&cdev->dev, vcdev); |
2e021043 | 1207 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
7e64e059 CH |
1208 | vcdev->vdev.id.vendor = cdev->id.cu_type; |
1209 | vcdev->vdev.id.device = cdev->id.cu_model; | |
6bb2c835 | 1210 | |
2003a7a5 MT |
1211 | ret = virtio_ccw_set_transport_rev(vcdev); |
1212 | if (ret) | |
1213 | goto out_free; | |
6bb2c835 | 1214 | |
7e64e059 CH |
1215 | ret = register_virtio_device(&vcdev->vdev); |
1216 | if (ret) { | |
1217 | dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", | |
1218 | ret); | |
1219 | goto out_put; | |
1220 | } | |
1221 | return 0; | |
1222 | out_put: | |
2e021043 | 1223 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
7e64e059 | 1224 | dev_set_drvdata(&cdev->dev, NULL); |
2e021043 | 1225 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
7e64e059 CH |
1226 | put_device(&vcdev->vdev.dev); |
1227 | return ret; | |
1228 | out_free: | |
1229 | if (vcdev) { | |
73fa21ea | 1230 | kfree(vcdev->status); |
7e64e059 | 1231 | kfree(vcdev->config_block); |
7e64e059 CH |
1232 | } |
1233 | kfree(vcdev); | |
1234 | return ret; | |
1235 | } | |
1236 | ||
1237 | static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) | |
1238 | { | |
e75279c4 HG |
1239 | int rc; |
1240 | struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); | |
1241 | ||
1242 | /* | |
1243 | * Make sure vcdev is set | |
1244 | * i.e. set_offline/remove callback not already running | |
1245 | */ | |
1246 | if (!vcdev) | |
1247 | return NOTIFY_DONE; | |
1248 | ||
1249 | switch (event) { | |
1250 | case CIO_GONE: | |
1251 | vcdev->device_lost = true; | |
1252 | rc = NOTIFY_DONE; | |
1253 | break; | |
1254 | default: | |
1255 | rc = NOTIFY_DONE; | |
1256 | break; | |
1257 | } | |
1258 | return rc; | |
7e64e059 CH |
1259 | } |
1260 | ||
1261 | static struct ccw_device_id virtio_ids[] = { | |
1262 | { CCW_DEVICE(0x3832, 0) }, | |
1263 | {}, | |
1264 | }; | |
1265 | MODULE_DEVICE_TABLE(ccw, virtio_ids); | |
1266 | ||
1267 | static struct ccw_driver virtio_ccw_driver = { | |
1268 | .driver = { | |
1269 | .owner = THIS_MODULE, | |
1270 | .name = "virtio_ccw", | |
1271 | }, | |
1272 | .ids = virtio_ids, | |
1273 | .probe = virtio_ccw_probe, | |
1274 | .remove = virtio_ccw_remove, | |
1275 | .set_offline = virtio_ccw_offline, | |
1276 | .set_online = virtio_ccw_online, | |
1277 | .notify = virtio_ccw_cio_notify, | |
89f88337 | 1278 | .int_class = IRQIO_VIR, |
7e64e059 CH |
1279 | }; |
1280 | ||
1281 | static int __init pure_hex(char **cp, unsigned int *val, int min_digit, | |
1282 | int max_digit, int max_val) | |
1283 | { | |
1284 | int diff; | |
1285 | ||
1286 | diff = 0; | |
1287 | *val = 0; | |
1288 | ||
1289 | while (diff <= max_digit) { | |
1290 | int value = hex_to_bin(**cp); | |
1291 | ||
1292 | if (value < 0) | |
1293 | break; | |
1294 | *val = *val * 16 + value; | |
1295 | (*cp)++; | |
1296 | diff++; | |
1297 | } | |
1298 | ||
1299 | if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) | |
1300 | return 1; | |
1301 | ||
1302 | return 0; | |
1303 | } | |
1304 | ||
1305 | static int __init parse_busid(char *str, unsigned int *cssid, | |
1306 | unsigned int *ssid, unsigned int *devno) | |
1307 | { | |
1308 | char *str_work; | |
1309 | int rc, ret; | |
1310 | ||
1311 | rc = 1; | |
1312 | ||
1313 | if (*str == '\0') | |
1314 | goto out; | |
1315 | ||
1316 | str_work = str; | |
1317 | ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); | |
1318 | if (ret || (str_work[0] != '.')) | |
1319 | goto out; | |
1320 | str_work++; | |
1321 | ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); | |
1322 | if (ret || (str_work[0] != '.')) | |
1323 | goto out; | |
1324 | str_work++; | |
1325 | ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); | |
1326 | if (ret || (str_work[0] != '\0')) | |
1327 | goto out; | |
1328 | ||
1329 | rc = 0; | |
1330 | out: | |
1331 | return rc; | |
1332 | } | |
1333 | ||
1334 | static void __init no_auto_parse(void) | |
1335 | { | |
1336 | unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; | |
1337 | char *parm, *str; | |
1338 | int rc; | |
1339 | ||
1340 | str = no_auto; | |
1341 | while ((parm = strsep(&str, ","))) { | |
1342 | rc = parse_busid(strsep(&parm, "-"), &from_cssid, | |
1343 | &from_ssid, &from); | |
1344 | if (rc) | |
1345 | continue; | |
1346 | if (parm != NULL) { | |
1347 | rc = parse_busid(parm, &to_cssid, | |
1348 | &to_ssid, &to); | |
1349 | if ((from_ssid > to_ssid) || | |
1350 | ((from_ssid == to_ssid) && (from > to))) | |
1351 | rc = -EINVAL; | |
1352 | } else { | |
1353 | to_cssid = from_cssid; | |
1354 | to_ssid = from_ssid; | |
1355 | to = from; | |
1356 | } | |
1357 | if (rc) | |
1358 | continue; | |
1359 | while ((from_ssid < to_ssid) || | |
1360 | ((from_ssid == to_ssid) && (from <= to))) { | |
1361 | set_bit(from, devs_no_auto[from_ssid]); | |
1362 | from++; | |
1363 | if (from > __MAX_SUBCHANNEL) { | |
1364 | from_ssid++; | |
1365 | from = 0; | |
1366 | } | |
1367 | } | |
1368 | } | |
1369 | } | |
1370 | ||
1371 | static int __init virtio_ccw_init(void) | |
1372 | { | |
1373 | /* parse no_auto string before we do anything further */ | |
1374 | no_auto_parse(); | |
1375 | return ccw_driver_register(&virtio_ccw_driver); | |
1376 | } | |
1377 | module_init(virtio_ccw_init); | |
1378 | ||
1379 | static void __exit virtio_ccw_exit(void) | |
1380 | { | |
96b14536 CH |
1381 | int i; |
1382 | ||
7e64e059 | 1383 | ccw_driver_unregister(&virtio_ccw_driver); |
96b14536 CH |
1384 | for (i = 0; i < MAX_AIRQ_AREAS; i++) |
1385 | destroy_airq_info(airq_areas[i]); | |
7e64e059 CH |
1386 | } |
1387 | module_exit(virtio_ccw_exit); |