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