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31fb1673 | 1 | // SPDX-License-Identifier: GPL-2.0 |
7e64e059 CH |
2 | /* |
3 | * ccw based virtio transport | |
4 | * | |
96b14536 | 5 | * Copyright IBM Corp. 2012, 2014 |
7e64e059 | 6 | * |
7e64e059 CH |
7 | * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> |
8 | */ | |
9 | ||
10 | #include <linux/kernel_stat.h> | |
11 | #include <linux/init.h> | |
57c8a661 | 12 | #include <linux/memblock.h> |
7e64e059 CH |
13 | #include <linux/err.h> |
14 | #include <linux/virtio.h> | |
15 | #include <linux/virtio_config.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <linux/virtio_ring.h> | |
19 | #include <linux/pfn.h> | |
20 | #include <linux/async.h> | |
21 | #include <linux/wait.h> | |
22 | #include <linux/list.h> | |
23 | #include <linux/bitops.h> | |
acc50ec7 | 24 | #include <linux/moduleparam.h> |
7e64e059 CH |
25 | #include <linux/io.h> |
26 | #include <linux/kvm_para.h> | |
e75279c4 | 27 | #include <linux/notifier.h> |
1ec2772e | 28 | #include <asm/diag.h> |
7e64e059 CH |
29 | #include <asm/setup.h> |
30 | #include <asm/irq.h> | |
31 | #include <asm/cio.h> | |
32 | #include <asm/ccwdev.h> | |
6a773cb8 | 33 | #include <asm/virtio-ccw.h> |
96b14536 CH |
34 | #include <asm/isc.h> |
35 | #include <asm/airq.h> | |
7e64e059 CH |
36 | |
37 | /* | |
38 | * virtio related functions | |
39 | */ | |
40 | ||
41 | struct vq_config_block { | |
42 | __u16 index; | |
43 | __u16 num; | |
44 | } __packed; | |
45 | ||
46 | #define VIRTIO_CCW_CONFIG_SIZE 0x100 | |
47 | /* same as PCI config space size, should be enough for all drivers */ | |
48 | ||
48720ba5 HP |
49 | struct vcdev_dma_area { |
50 | unsigned long indicators; | |
51 | unsigned long indicators2; | |
52 | struct vq_config_block config_block; | |
53 | __u8 status; | |
54 | }; | |
55 | ||
7e64e059 CH |
56 | struct virtio_ccw_device { |
57 | struct virtio_device vdev; | |
7e64e059 CH |
58 | __u8 config[VIRTIO_CCW_CONFIG_SIZE]; |
59 | struct ccw_device *cdev; | |
7e64e059 CH |
60 | __u32 curr_io; |
61 | int err; | |
6bb2c835 | 62 | unsigned int revision; /* Transport revision */ |
7e64e059 CH |
63 | wait_queue_head_t wait_q; |
64 | spinlock_t lock; | |
78b1a52e | 65 | struct mutex io_lock; /* Serializes I/O requests */ |
7e64e059 | 66 | struct list_head virtqueues; |
96b14536 | 67 | bool is_thinint; |
79629b20 | 68 | bool going_away; |
e75279c4 | 69 | bool device_lost; |
431dae77 | 70 | unsigned int config_ready; |
96b14536 | 71 | void *airq_info; |
48720ba5 | 72 | struct vcdev_dma_area *dma_area; |
7e64e059 CH |
73 | }; |
74 | ||
22a4a639 HP |
75 | static inline unsigned long *indicators(struct virtio_ccw_device *vcdev) |
76 | { | |
48720ba5 | 77 | return &vcdev->dma_area->indicators; |
22a4a639 HP |
78 | } |
79 | ||
80 | static inline unsigned long *indicators2(struct virtio_ccw_device *vcdev) | |
81 | { | |
48720ba5 | 82 | return &vcdev->dma_area->indicators2; |
22a4a639 HP |
83 | } |
84 | ||
d4674240 | 85 | struct vq_info_block_legacy { |
7e64e059 CH |
86 | __u64 queue; |
87 | __u32 align; | |
88 | __u16 index; | |
89 | __u16 num; | |
90 | } __packed; | |
91 | ||
d4674240 CH |
92 | struct vq_info_block { |
93 | __u64 desc; | |
94 | __u32 res0; | |
95 | __u16 index; | |
96 | __u16 num; | |
97 | __u64 avail; | |
98 | __u64 used; | |
99 | } __packed; | |
100 | ||
7e64e059 | 101 | struct virtio_feature_desc { |
fb317002 | 102 | __le32 features; |
7e64e059 CH |
103 | __u8 index; |
104 | } __packed; | |
105 | ||
96b14536 CH |
106 | struct virtio_thinint_area { |
107 | unsigned long summary_indicator; | |
108 | unsigned long indicator; | |
109 | u64 bit_nr; | |
110 | u8 isc; | |
111 | } __packed; | |
112 | ||
6bb2c835 TH |
113 | struct virtio_rev_info { |
114 | __u16 revision; | |
115 | __u16 length; | |
116 | __u8 data[]; | |
117 | }; | |
118 | ||
119 | /* the highest virtio-ccw revision we support */ | |
af9ca13b | 120 | #define VIRTIO_CCW_REV_MAX 1 |
6bb2c835 | 121 | |
7e64e059 CH |
122 | struct virtio_ccw_vq_info { |
123 | struct virtqueue *vq; | |
124 | int num; | |
d4674240 CH |
125 | union { |
126 | struct vq_info_block s; | |
127 | struct vq_info_block_legacy l; | |
128 | } *info_block; | |
96b14536 | 129 | int bit_nr; |
7e64e059 | 130 | struct list_head node; |
07e16933 | 131 | long cookie; |
7e64e059 CH |
132 | }; |
133 | ||
96b14536 CH |
134 | #define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */ |
135 | ||
136 | #define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8) | |
137 | #define MAX_AIRQ_AREAS 20 | |
138 | ||
139 | static int virtio_ccw_use_airq = 1; | |
140 | ||
141 | struct airq_info { | |
142 | rwlock_t lock; | |
39c7dcb1 | 143 | u8 summary_indicator_idx; |
96b14536 CH |
144 | struct airq_struct airq; |
145 | struct airq_iv *aiv; | |
146 | }; | |
147 | static struct airq_info *airq_areas[MAX_AIRQ_AREAS]; | |
39c7dcb1 HP |
148 | static u8 *summary_indicators; |
149 | ||
150 | static inline u8 *get_summary_indicator(struct airq_info *info) | |
151 | { | |
152 | return summary_indicators + info->summary_indicator_idx; | |
153 | } | |
96b14536 | 154 | |
7e64e059 CH |
155 | #define CCW_CMD_SET_VQ 0x13 |
156 | #define CCW_CMD_VDEV_RESET 0x33 | |
157 | #define CCW_CMD_SET_IND 0x43 | |
158 | #define CCW_CMD_SET_CONF_IND 0x53 | |
159 | #define CCW_CMD_READ_FEAT 0x12 | |
160 | #define CCW_CMD_WRITE_FEAT 0x11 | |
161 | #define CCW_CMD_READ_CONF 0x22 | |
162 | #define CCW_CMD_WRITE_CONF 0x21 | |
163 | #define CCW_CMD_WRITE_STATUS 0x31 | |
164 | #define CCW_CMD_READ_VQ_CONF 0x32 | |
7d3ce5ab | 165 | #define CCW_CMD_READ_STATUS 0x72 |
96b14536 | 166 | #define CCW_CMD_SET_IND_ADAPTER 0x73 |
6bb2c835 | 167 | #define CCW_CMD_SET_VIRTIO_REV 0x83 |
7e64e059 CH |
168 | |
169 | #define VIRTIO_CCW_DOING_SET_VQ 0x00010000 | |
170 | #define VIRTIO_CCW_DOING_RESET 0x00040000 | |
171 | #define VIRTIO_CCW_DOING_READ_FEAT 0x00080000 | |
172 | #define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000 | |
173 | #define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000 | |
174 | #define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000 | |
175 | #define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000 | |
176 | #define VIRTIO_CCW_DOING_SET_IND 0x01000000 | |
177 | #define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000 | |
178 | #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000 | |
96b14536 | 179 | #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000 |
6bb2c835 | 180 | #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000 |
7d3ce5ab | 181 | #define VIRTIO_CCW_DOING_READ_STATUS 0x20000000 |
7e64e059 CH |
182 | #define VIRTIO_CCW_INTPARM_MASK 0xffff0000 |
183 | ||
184 | static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev) | |
185 | { | |
186 | return container_of(vdev, struct virtio_ccw_device, vdev); | |
187 | } | |
188 | ||
96b14536 CH |
189 | static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info) |
190 | { | |
191 | unsigned long i, flags; | |
192 | ||
193 | write_lock_irqsave(&info->lock, flags); | |
194 | for (i = 0; i < airq_iv_end(info->aiv); i++) { | |
195 | if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) { | |
196 | airq_iv_free_bit(info->aiv, i); | |
197 | airq_iv_set_ptr(info->aiv, i, 0); | |
198 | break; | |
199 | } | |
200 | } | |
201 | write_unlock_irqrestore(&info->lock, flags); | |
202 | } | |
203 | ||
30e63ef2 | 204 | static void virtio_airq_handler(struct airq_struct *airq, bool floating) |
96b14536 CH |
205 | { |
206 | struct airq_info *info = container_of(airq, struct airq_info, airq); | |
207 | unsigned long ai; | |
208 | ||
209 | inc_irq_stat(IRQIO_VAI); | |
210 | read_lock(&info->lock); | |
211 | /* Walk through indicators field, summary indicator active. */ | |
212 | for (ai = 0;;) { | |
213 | ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); | |
214 | if (ai == -1UL) | |
215 | break; | |
216 | vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); | |
217 | } | |
39c7dcb1 | 218 | *(get_summary_indicator(info)) = 0; |
96b14536 CH |
219 | smp_wmb(); |
220 | /* Walk through indicators field, summary indicator not active. */ | |
221 | for (ai = 0;;) { | |
222 | ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); | |
223 | if (ai == -1UL) | |
224 | break; | |
225 | vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); | |
226 | } | |
227 | read_unlock(&info->lock); | |
228 | } | |
229 | ||
39c7dcb1 | 230 | static struct airq_info *new_airq_info(int index) |
96b14536 CH |
231 | { |
232 | struct airq_info *info; | |
233 | int rc; | |
234 | ||
235 | info = kzalloc(sizeof(*info), GFP_KERNEL); | |
236 | if (!info) | |
237 | return NULL; | |
238 | rwlock_init(&info->lock); | |
01b3fb1e HP |
239 | info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR |
240 | | AIRQ_IV_CACHELINE); | |
96b14536 CH |
241 | if (!info->aiv) { |
242 | kfree(info); | |
243 | return NULL; | |
244 | } | |
245 | info->airq.handler = virtio_airq_handler; | |
39c7dcb1 HP |
246 | info->summary_indicator_idx = index; |
247 | info->airq.lsi_ptr = get_summary_indicator(info); | |
96b14536 CH |
248 | info->airq.lsi_mask = 0xff; |
249 | info->airq.isc = VIRTIO_AIRQ_ISC; | |
250 | rc = register_adapter_interrupt(&info->airq); | |
251 | if (rc) { | |
252 | airq_iv_release(info->aiv); | |
253 | kfree(info); | |
254 | return NULL; | |
255 | } | |
256 | return info; | |
257 | } | |
258 | ||
96b14536 CH |
259 | static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs, |
260 | u64 *first, void **airq_info) | |
261 | { | |
262 | int i, j; | |
263 | struct airq_info *info; | |
264 | unsigned long indicator_addr = 0; | |
265 | unsigned long bit, flags; | |
266 | ||
267 | for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) { | |
268 | if (!airq_areas[i]) | |
39c7dcb1 | 269 | airq_areas[i] = new_airq_info(i); |
96b14536 CH |
270 | info = airq_areas[i]; |
271 | if (!info) | |
272 | return 0; | |
273 | write_lock_irqsave(&info->lock, flags); | |
274 | bit = airq_iv_alloc(info->aiv, nvqs); | |
275 | if (bit == -1UL) { | |
276 | /* Not enough vacancies. */ | |
277 | write_unlock_irqrestore(&info->lock, flags); | |
278 | continue; | |
279 | } | |
280 | *first = bit; | |
281 | *airq_info = info; | |
282 | indicator_addr = (unsigned long)info->aiv->vector; | |
283 | for (j = 0; j < nvqs; j++) { | |
284 | airq_iv_set_ptr(info->aiv, bit + j, | |
285 | (unsigned long)vqs[j]); | |
286 | } | |
287 | write_unlock_irqrestore(&info->lock, flags); | |
288 | } | |
289 | return indicator_addr; | |
290 | } | |
291 | ||
292 | static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev) | |
293 | { | |
294 | struct virtio_ccw_vq_info *info; | |
295 | ||
3438b2c0 HP |
296 | if (!vcdev->airq_info) |
297 | return; | |
96b14536 CH |
298 | list_for_each_entry(info, &vcdev->virtqueues, node) |
299 | drop_airq_indicator(info->vq, vcdev->airq_info); | |
300 | } | |
301 | ||
7e64e059 CH |
302 | static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag) |
303 | { | |
304 | unsigned long flags; | |
305 | __u32 ret; | |
306 | ||
307 | spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); | |
308 | if (vcdev->err) | |
309 | ret = 0; | |
310 | else | |
311 | ret = vcdev->curr_io & flag; | |
312 | spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); | |
313 | return ret; | |
314 | } | |
315 | ||
73fa21ea CH |
316 | static int ccw_io_helper(struct virtio_ccw_device *vcdev, |
317 | struct ccw1 *ccw, __u32 intparm) | |
7e64e059 CH |
318 | { |
319 | int ret; | |
320 | unsigned long flags; | |
321 | int flag = intparm & VIRTIO_CCW_INTPARM_MASK; | |
322 | ||
78b1a52e | 323 | mutex_lock(&vcdev->io_lock); |
b26ba22b CB |
324 | do { |
325 | spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); | |
326 | ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0); | |
99437a27 CH |
327 | if (!ret) { |
328 | if (!vcdev->curr_io) | |
329 | vcdev->err = 0; | |
b26ba22b | 330 | vcdev->curr_io |= flag; |
99437a27 | 331 | } |
b26ba22b CB |
332 | spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); |
333 | cpu_relax(); | |
334 | } while (ret == -EBUSY); | |
7e64e059 | 335 | wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0); |
78b1a52e HP |
336 | ret = ret ? ret : vcdev->err; |
337 | mutex_unlock(&vcdev->io_lock); | |
338 | return ret; | |
7e64e059 CH |
339 | } |
340 | ||
96b14536 CH |
341 | static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev, |
342 | struct ccw1 *ccw) | |
343 | { | |
344 | int ret; | |
345 | unsigned long *indicatorp = NULL; | |
346 | struct virtio_thinint_area *thinint_area = NULL; | |
347 | struct airq_info *airq_info = vcdev->airq_info; | |
348 | ||
349 | if (vcdev->is_thinint) { | |
48720ba5 HP |
350 | thinint_area = ccw_device_dma_zalloc(vcdev->cdev, |
351 | sizeof(*thinint_area)); | |
96b14536 CH |
352 | if (!thinint_area) |
353 | return; | |
354 | thinint_area->summary_indicator = | |
39c7dcb1 | 355 | (unsigned long) get_summary_indicator(airq_info); |
96b14536 CH |
356 | thinint_area->isc = VIRTIO_AIRQ_ISC; |
357 | ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; | |
358 | ccw->count = sizeof(*thinint_area); | |
359 | ccw->cda = (__u32)(unsigned long) thinint_area; | |
360 | } else { | |
c235082b | 361 | /* payload is the address of the indicators */ |
48720ba5 HP |
362 | indicatorp = ccw_device_dma_zalloc(vcdev->cdev, |
363 | sizeof(indicators(vcdev))); | |
96b14536 CH |
364 | if (!indicatorp) |
365 | return; | |
366 | *indicatorp = 0; | |
367 | ccw->cmd_code = CCW_CMD_SET_IND; | |
22a4a639 | 368 | ccw->count = sizeof(indicators(vcdev)); |
96b14536 CH |
369 | ccw->cda = (__u32)(unsigned long) indicatorp; |
370 | } | |
371 | /* Deregister indicators from host. */ | |
22a4a639 | 372 | *indicators(vcdev) = 0; |
96b14536 CH |
373 | ccw->flags = 0; |
374 | ret = ccw_io_helper(vcdev, ccw, | |
375 | vcdev->is_thinint ? | |
376 | VIRTIO_CCW_DOING_SET_IND_ADAPTER : | |
377 | VIRTIO_CCW_DOING_SET_IND); | |
378 | if (ret && (ret != -ENODEV)) | |
379 | dev_info(&vcdev->cdev->dev, | |
380 | "Failed to deregister indicators (%d)\n", ret); | |
381 | else if (vcdev->is_thinint) | |
382 | virtio_ccw_drop_indicators(vcdev); | |
48720ba5 HP |
383 | ccw_device_dma_free(vcdev->cdev, indicatorp, sizeof(indicators(vcdev))); |
384 | ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area)); | |
96b14536 CH |
385 | } |
386 | ||
1ec2772e MS |
387 | static inline long __do_kvm_notify(struct subchannel_id schid, |
388 | unsigned long queue_index, | |
389 | long cookie) | |
7e64e059 CH |
390 | { |
391 | register unsigned long __nr asm("1") = KVM_S390_VIRTIO_CCW_NOTIFY; | |
392 | register struct subchannel_id __schid asm("2") = schid; | |
393 | register unsigned long __index asm("3") = queue_index; | |
394 | register long __rc asm("2"); | |
07e16933 | 395 | register long __cookie asm("4") = cookie; |
7e64e059 CH |
396 | |
397 | asm volatile ("diag 2,4,0x500\n" | |
07e16933 MT |
398 | : "=d" (__rc) : "d" (__nr), "d" (__schid), "d" (__index), |
399 | "d"(__cookie) | |
7e64e059 CH |
400 | : "memory", "cc"); |
401 | return __rc; | |
402 | } | |
403 | ||
1ec2772e MS |
404 | static inline long do_kvm_notify(struct subchannel_id schid, |
405 | unsigned long queue_index, | |
406 | long cookie) | |
407 | { | |
408 | diag_stat_inc(DIAG_STAT_X500); | |
409 | return __do_kvm_notify(schid, queue_index, cookie); | |
410 | } | |
411 | ||
46f9c2b9 | 412 | static bool virtio_ccw_kvm_notify(struct virtqueue *vq) |
7e64e059 CH |
413 | { |
414 | struct virtio_ccw_vq_info *info = vq->priv; | |
415 | struct virtio_ccw_device *vcdev; | |
416 | struct subchannel_id schid; | |
417 | ||
418 | vcdev = to_vc_device(info->vq->vdev); | |
419 | ccw_device_get_schid(vcdev->cdev, &schid); | |
01227a88 | 420 | info->cookie = do_kvm_notify(schid, vq->index, info->cookie); |
46f9c2b9 HG |
421 | if (info->cookie < 0) |
422 | return false; | |
423 | return true; | |
7e64e059 CH |
424 | } |
425 | ||
73fa21ea CH |
426 | static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, |
427 | struct ccw1 *ccw, int index) | |
7e64e059 | 428 | { |
ad2aa042 PM |
429 | int ret; |
430 | ||
48720ba5 | 431 | vcdev->dma_area->config_block.index = index; |
73fa21ea CH |
432 | ccw->cmd_code = CCW_CMD_READ_VQ_CONF; |
433 | ccw->flags = 0; | |
434 | ccw->count = sizeof(struct vq_config_block); | |
48720ba5 | 435 | ccw->cda = (__u32)(unsigned long)(&vcdev->dma_area->config_block); |
ad2aa042 PM |
436 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF); |
437 | if (ret) | |
438 | return ret; | |
48720ba5 | 439 | return vcdev->dma_area->config_block.num ?: -ENOENT; |
7e64e059 CH |
440 | } |
441 | ||
73fa21ea | 442 | static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw) |
7e64e059 CH |
443 | { |
444 | struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev); | |
445 | struct virtio_ccw_vq_info *info = vq->priv; | |
446 | unsigned long flags; | |
7e64e059 | 447 | int ret; |
9d0ca6ed | 448 | unsigned int index = vq->index; |
7e64e059 CH |
449 | |
450 | /* Remove from our list. */ | |
451 | spin_lock_irqsave(&vcdev->lock, flags); | |
452 | list_del(&info->node); | |
453 | spin_unlock_irqrestore(&vcdev->lock, flags); | |
454 | ||
455 | /* Release from host. */ | |
d4674240 CH |
456 | if (vcdev->revision == 0) { |
457 | info->info_block->l.queue = 0; | |
458 | info->info_block->l.align = 0; | |
459 | info->info_block->l.index = index; | |
460 | info->info_block->l.num = 0; | |
461 | ccw->count = sizeof(info->info_block->l); | |
462 | } else { | |
463 | info->info_block->s.desc = 0; | |
464 | info->info_block->s.index = index; | |
465 | info->info_block->s.num = 0; | |
466 | info->info_block->s.avail = 0; | |
467 | info->info_block->s.used = 0; | |
468 | ccw->count = sizeof(info->info_block->s); | |
469 | } | |
73fa21ea CH |
470 | ccw->cmd_code = CCW_CMD_SET_VQ; |
471 | ccw->flags = 0; | |
73fa21ea CH |
472 | ccw->cda = (__u32)(unsigned long)(info->info_block); |
473 | ret = ccw_io_helper(vcdev, ccw, | |
474 | VIRTIO_CCW_DOING_SET_VQ | index); | |
7e64e059 CH |
475 | /* |
476 | * -ENODEV isn't considered an error: The device is gone anyway. | |
477 | * This may happen on device detach. | |
478 | */ | |
479 | if (ret && (ret != -ENODEV)) | |
99240622 | 480 | dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n", |
7e64e059 CH |
481 | ret, index); |
482 | ||
483 | vring_del_virtqueue(vq); | |
48720ba5 HP |
484 | ccw_device_dma_free(vcdev->cdev, info->info_block, |
485 | sizeof(*info->info_block)); | |
7e64e059 CH |
486 | kfree(info); |
487 | } | |
488 | ||
489 | static void virtio_ccw_del_vqs(struct virtio_device *vdev) | |
490 | { | |
491 | struct virtqueue *vq, *n; | |
73fa21ea | 492 | struct ccw1 *ccw; |
96b14536 | 493 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
73fa21ea | 494 | |
48720ba5 | 495 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
73fa21ea CH |
496 | if (!ccw) |
497 | return; | |
498 | ||
96b14536 | 499 | virtio_ccw_drop_indicator(vcdev, ccw); |
7e64e059 CH |
500 | |
501 | list_for_each_entry_safe(vq, n, &vdev->vqs, list) | |
73fa21ea CH |
502 | virtio_ccw_del_vq(vq, ccw); |
503 | ||
48720ba5 | 504 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
7e64e059 CH |
505 | } |
506 | ||
507 | static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, | |
508 | int i, vq_callback_t *callback, | |
f94682dd | 509 | const char *name, bool ctx, |
73fa21ea | 510 | struct ccw1 *ccw) |
7e64e059 CH |
511 | { |
512 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
513 | int err; | |
c98d3683 | 514 | struct virtqueue *vq = NULL; |
7e64e059 | 515 | struct virtio_ccw_vq_info *info; |
3279beac | 516 | u64 queue; |
7e64e059 | 517 | unsigned long flags; |
3279beac | 518 | bool may_reduce; |
7e64e059 CH |
519 | |
520 | /* Allocate queue. */ | |
521 | info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL); | |
522 | if (!info) { | |
523 | dev_warn(&vcdev->cdev->dev, "no info\n"); | |
524 | err = -ENOMEM; | |
525 | goto out_err; | |
526 | } | |
48720ba5 HP |
527 | info->info_block = ccw_device_dma_zalloc(vcdev->cdev, |
528 | sizeof(*info->info_block)); | |
7e64e059 CH |
529 | if (!info->info_block) { |
530 | dev_warn(&vcdev->cdev->dev, "no info block\n"); | |
531 | err = -ENOMEM; | |
532 | goto out_err; | |
533 | } | |
73fa21ea | 534 | info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i); |
ad2aa042 PM |
535 | if (info->num < 0) { |
536 | err = info->num; | |
537 | goto out_err; | |
538 | } | |
3279beac HP |
539 | may_reduce = vcdev->revision > 0; |
540 | vq = vring_create_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, | |
541 | vdev, true, may_reduce, ctx, | |
542 | virtio_ccw_kvm_notify, callback, name); | |
7e64e059 | 543 | |
7e64e059 CH |
544 | if (!vq) { |
545 | /* For now, we fail if we can't get the requested size. */ | |
546 | dev_warn(&vcdev->cdev->dev, "no vq\n"); | |
547 | err = -ENOMEM; | |
7e64e059 CH |
548 | goto out_err; |
549 | } | |
3279beac HP |
550 | /* it may have been reduced */ |
551 | info->num = virtqueue_get_vring_size(vq); | |
7e64e059 CH |
552 | |
553 | /* Register it with the host. */ | |
3279beac | 554 | queue = virtqueue_get_desc_addr(vq); |
d4674240 | 555 | if (vcdev->revision == 0) { |
3279beac | 556 | info->info_block->l.queue = queue; |
d4674240 CH |
557 | info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN; |
558 | info->info_block->l.index = i; | |
559 | info->info_block->l.num = info->num; | |
560 | ccw->count = sizeof(info->info_block->l); | |
561 | } else { | |
3279beac | 562 | info->info_block->s.desc = queue; |
d4674240 CH |
563 | info->info_block->s.index = i; |
564 | info->info_block->s.num = info->num; | |
f35f54f1 HP |
565 | info->info_block->s.avail = (__u64)virtqueue_get_avail_addr(vq); |
566 | info->info_block->s.used = (__u64)virtqueue_get_used_addr(vq); | |
d4674240 CH |
567 | ccw->count = sizeof(info->info_block->s); |
568 | } | |
73fa21ea CH |
569 | ccw->cmd_code = CCW_CMD_SET_VQ; |
570 | ccw->flags = 0; | |
73fa21ea CH |
571 | ccw->cda = (__u32)(unsigned long)(info->info_block); |
572 | err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i); | |
7e64e059 CH |
573 | if (err) { |
574 | dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n"); | |
7e64e059 CH |
575 | goto out_err; |
576 | } | |
577 | ||
c98d3683 CH |
578 | info->vq = vq; |
579 | vq->priv = info; | |
580 | ||
7e64e059 CH |
581 | /* Save it to our list. */ |
582 | spin_lock_irqsave(&vcdev->lock, flags); | |
583 | list_add(&info->node, &vcdev->virtqueues); | |
584 | spin_unlock_irqrestore(&vcdev->lock, flags); | |
585 | ||
586 | return vq; | |
587 | ||
588 | out_err: | |
c98d3683 CH |
589 | if (vq) |
590 | vring_del_virtqueue(vq); | |
591 | if (info) { | |
48720ba5 HP |
592 | ccw_device_dma_free(vcdev->cdev, info->info_block, |
593 | sizeof(*info->info_block)); | |
c98d3683 | 594 | } |
7e64e059 CH |
595 | kfree(info); |
596 | return ERR_PTR(err); | |
597 | } | |
598 | ||
96b14536 CH |
599 | static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev, |
600 | struct virtqueue *vqs[], int nvqs, | |
601 | struct ccw1 *ccw) | |
602 | { | |
603 | int ret; | |
604 | struct virtio_thinint_area *thinint_area = NULL; | |
605 | struct airq_info *info; | |
606 | ||
48720ba5 HP |
607 | thinint_area = ccw_device_dma_zalloc(vcdev->cdev, |
608 | sizeof(*thinint_area)); | |
96b14536 CH |
609 | if (!thinint_area) { |
610 | ret = -ENOMEM; | |
611 | goto out; | |
612 | } | |
613 | /* Try to get an indicator. */ | |
614 | thinint_area->indicator = get_airq_indicator(vqs, nvqs, | |
615 | &thinint_area->bit_nr, | |
616 | &vcdev->airq_info); | |
617 | if (!thinint_area->indicator) { | |
618 | ret = -ENOSPC; | |
619 | goto out; | |
620 | } | |
621 | info = vcdev->airq_info; | |
622 | thinint_area->summary_indicator = | |
39c7dcb1 | 623 | (unsigned long) get_summary_indicator(info); |
96b14536 CH |
624 | thinint_area->isc = VIRTIO_AIRQ_ISC; |
625 | ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; | |
626 | ccw->flags = CCW_FLAG_SLI; | |
627 | ccw->count = sizeof(*thinint_area); | |
628 | ccw->cda = (__u32)(unsigned long)thinint_area; | |
629 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER); | |
630 | if (ret) { | |
631 | if (ret == -EOPNOTSUPP) { | |
632 | /* | |
633 | * The host does not support adapter interrupts | |
634 | * for virtio-ccw, stop trying. | |
635 | */ | |
636 | virtio_ccw_use_airq = 0; | |
637 | pr_info("Adapter interrupts unsupported on host\n"); | |
638 | } else | |
639 | dev_warn(&vcdev->cdev->dev, | |
640 | "enabling adapter interrupts = %d\n", ret); | |
641 | virtio_ccw_drop_indicators(vcdev); | |
642 | } | |
643 | out: | |
48720ba5 | 644 | ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area)); |
96b14536 CH |
645 | return ret; |
646 | } | |
647 | ||
7e64e059 CH |
648 | static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, |
649 | struct virtqueue *vqs[], | |
650 | vq_callback_t *callbacks[], | |
fb5e31d9 | 651 | const char * const names[], |
f94682dd | 652 | const bool *ctx, |
fb5e31d9 | 653 | struct irq_affinity *desc) |
7e64e059 CH |
654 | { |
655 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
656 | unsigned long *indicatorp = NULL; | |
a229989d | 657 | int ret, i, queue_idx = 0; |
73fa21ea CH |
658 | struct ccw1 *ccw; |
659 | ||
48720ba5 | 660 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
73fa21ea CH |
661 | if (!ccw) |
662 | return -ENOMEM; | |
7e64e059 CH |
663 | |
664 | for (i = 0; i < nvqs; ++i) { | |
a229989d WW |
665 | if (!names[i]) { |
666 | vqs[i] = NULL; | |
667 | continue; | |
668 | } | |
669 | ||
670 | vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, callbacks[i], | |
671 | names[i], ctx ? ctx[i] : false, | |
672 | ccw); | |
7e64e059 CH |
673 | if (IS_ERR(vqs[i])) { |
674 | ret = PTR_ERR(vqs[i]); | |
675 | vqs[i] = NULL; | |
676 | goto out; | |
677 | } | |
678 | } | |
679 | ret = -ENOMEM; | |
c235082b CH |
680 | /* |
681 | * We need a data area under 2G to communicate. Our payload is | |
682 | * the address of the indicators. | |
683 | */ | |
48720ba5 HP |
684 | indicatorp = ccw_device_dma_zalloc(vcdev->cdev, |
685 | sizeof(indicators(vcdev))); | |
7e64e059 CH |
686 | if (!indicatorp) |
687 | goto out; | |
22a4a639 | 688 | *indicatorp = (unsigned long) indicators(vcdev); |
96b14536 CH |
689 | if (vcdev->is_thinint) { |
690 | ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); | |
691 | if (ret) | |
692 | /* no error, just fall back to legacy interrupts */ | |
970ba6ac | 693 | vcdev->is_thinint = false; |
96b14536 CH |
694 | } |
695 | if (!vcdev->is_thinint) { | |
696 | /* Register queue indicators with host. */ | |
22a4a639 | 697 | *indicators(vcdev) = 0; |
96b14536 CH |
698 | ccw->cmd_code = CCW_CMD_SET_IND; |
699 | ccw->flags = 0; | |
22a4a639 | 700 | ccw->count = sizeof(indicators(vcdev)); |
96b14536 CH |
701 | ccw->cda = (__u32)(unsigned long) indicatorp; |
702 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); | |
703 | if (ret) | |
704 | goto out; | |
705 | } | |
7e64e059 | 706 | /* Register indicators2 with host for config changes */ |
22a4a639 HP |
707 | *indicatorp = (unsigned long) indicators2(vcdev); |
708 | *indicators2(vcdev) = 0; | |
73fa21ea CH |
709 | ccw->cmd_code = CCW_CMD_SET_CONF_IND; |
710 | ccw->flags = 0; | |
22a4a639 | 711 | ccw->count = sizeof(indicators2(vcdev)); |
73fa21ea CH |
712 | ccw->cda = (__u32)(unsigned long) indicatorp; |
713 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); | |
7e64e059 CH |
714 | if (ret) |
715 | goto out; | |
716 | ||
48720ba5 HP |
717 | if (indicatorp) |
718 | ccw_device_dma_free(vcdev->cdev, indicatorp, | |
719 | sizeof(indicators(vcdev))); | |
720 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); | |
7e64e059 CH |
721 | return 0; |
722 | out: | |
48720ba5 HP |
723 | if (indicatorp) |
724 | ccw_device_dma_free(vcdev->cdev, indicatorp, | |
725 | sizeof(indicators(vcdev))); | |
726 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); | |
7e64e059 CH |
727 | virtio_ccw_del_vqs(vdev); |
728 | return ret; | |
729 | } | |
730 | ||
731 | static void virtio_ccw_reset(struct virtio_device *vdev) | |
732 | { | |
733 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
73fa21ea CH |
734 | struct ccw1 *ccw; |
735 | ||
48720ba5 | 736 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
73fa21ea CH |
737 | if (!ccw) |
738 | return; | |
7e64e059 CH |
739 | |
740 | /* Zero status bits. */ | |
48720ba5 | 741 | vcdev->dma_area->status = 0; |
7e64e059 CH |
742 | |
743 | /* Send a reset ccw on device. */ | |
73fa21ea CH |
744 | ccw->cmd_code = CCW_CMD_VDEV_RESET; |
745 | ccw->flags = 0; | |
746 | ccw->count = 0; | |
747 | ccw->cda = 0; | |
748 | ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); | |
48720ba5 | 749 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
7e64e059 CH |
750 | } |
751 | ||
d0254773 | 752 | static u64 virtio_ccw_get_features(struct virtio_device *vdev) |
7e64e059 CH |
753 | { |
754 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
73fa21ea | 755 | struct virtio_feature_desc *features; |
732c56e9 MT |
756 | int ret; |
757 | u64 rc; | |
73fa21ea | 758 | struct ccw1 *ccw; |
7e64e059 | 759 | |
48720ba5 | 760 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
73fa21ea CH |
761 | if (!ccw) |
762 | return 0; | |
763 | ||
48720ba5 | 764 | features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features)); |
73fa21ea CH |
765 | if (!features) { |
766 | rc = 0; | |
767 | goto out_free; | |
768 | } | |
7e64e059 | 769 | /* Read the feature bits from the host. */ |
73fa21ea CH |
770 | features->index = 0; |
771 | ccw->cmd_code = CCW_CMD_READ_FEAT; | |
772 | ccw->flags = 0; | |
773 | ccw->count = sizeof(*features); | |
774 | ccw->cda = (__u32)(unsigned long)features; | |
775 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); | |
776 | if (ret) { | |
777 | rc = 0; | |
778 | goto out_free; | |
779 | } | |
780 | ||
781 | rc = le32_to_cpu(features->features); | |
7e64e059 | 782 | |
ce15408f MT |
783 | if (vcdev->revision == 0) |
784 | goto out_free; | |
785 | ||
732c56e9 MT |
786 | /* Read second half of the feature bits from the host. */ |
787 | features->index = 1; | |
788 | ccw->cmd_code = CCW_CMD_READ_FEAT; | |
789 | ccw->flags = 0; | |
790 | ccw->count = sizeof(*features); | |
791 | ccw->cda = (__u32)(unsigned long)features; | |
792 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); | |
793 | if (ret == 0) | |
794 | rc |= (u64)le32_to_cpu(features->features) << 32; | |
795 | ||
73fa21ea | 796 | out_free: |
48720ba5 HP |
797 | ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); |
798 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); | |
73fa21ea | 799 | return rc; |
7e64e059 CH |
800 | } |
801 | ||
3a814fdf TB |
802 | static void ccw_transport_features(struct virtio_device *vdev) |
803 | { | |
804 | /* | |
050f4c4d | 805 | * Currently nothing to do here. |
3a814fdf | 806 | */ |
3a814fdf TB |
807 | } |
808 | ||
5c609a5e | 809 | static int virtio_ccw_finalize_features(struct virtio_device *vdev) |
7e64e059 CH |
810 | { |
811 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
73fa21ea | 812 | struct virtio_feature_desc *features; |
73fa21ea | 813 | struct ccw1 *ccw; |
f01a2a81 | 814 | int ret; |
73fa21ea | 815 | |
f13d8bc2 | 816 | if (vcdev->revision >= 1 && |
4d23676f MT |
817 | !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { |
818 | dev_err(&vdev->dev, "virtio: device uses revision 1 " | |
819 | "but does not have VIRTIO_F_VERSION_1\n"); | |
820 | return -EINVAL; | |
821 | } | |
822 | ||
48720ba5 | 823 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
73fa21ea | 824 | if (!ccw) |
f01a2a81 | 825 | return -ENOMEM; |
73fa21ea | 826 | |
48720ba5 | 827 | features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features)); |
f01a2a81 CH |
828 | if (!features) { |
829 | ret = -ENOMEM; | |
73fa21ea | 830 | goto out_free; |
f01a2a81 | 831 | } |
7e64e059 CH |
832 | /* Give virtio_ring a chance to accept features. */ |
833 | vring_transport_features(vdev); | |
834 | ||
3a814fdf TB |
835 | /* Give virtio_ccw a chance to accept features. */ |
836 | ccw_transport_features(vdev); | |
837 | ||
e16e12be | 838 | features->index = 0; |
732c56e9 MT |
839 | features->features = cpu_to_le32((u32)vdev->features); |
840 | /* Write the first half of the feature bits to the host. */ | |
841 | ccw->cmd_code = CCW_CMD_WRITE_FEAT; | |
842 | ccw->flags = 0; | |
843 | ccw->count = sizeof(*features); | |
844 | ccw->cda = (__u32)(unsigned long)features; | |
f01a2a81 CH |
845 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); |
846 | if (ret) | |
847 | goto out_free; | |
732c56e9 | 848 | |
ce15408f MT |
849 | if (vcdev->revision == 0) |
850 | goto out_free; | |
851 | ||
732c56e9 MT |
852 | features->index = 1; |
853 | features->features = cpu_to_le32(vdev->features >> 32); | |
854 | /* Write the second half of the feature bits to the host. */ | |
e16e12be MT |
855 | ccw->cmd_code = CCW_CMD_WRITE_FEAT; |
856 | ccw->flags = 0; | |
857 | ccw->count = sizeof(*features); | |
858 | ccw->cda = (__u32)(unsigned long)features; | |
f01a2a81 | 859 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); |
e16e12be | 860 | |
73fa21ea | 861 | out_free: |
48720ba5 HP |
862 | ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); |
863 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); | |
5c609a5e | 864 | |
f01a2a81 | 865 | return ret; |
7e64e059 CH |
866 | } |
867 | ||
868 | static void virtio_ccw_get_config(struct virtio_device *vdev, | |
869 | unsigned int offset, void *buf, unsigned len) | |
870 | { | |
871 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
872 | int ret; | |
73fa21ea CH |
873 | struct ccw1 *ccw; |
874 | void *config_area; | |
2448a299 | 875 | unsigned long flags; |
73fa21ea | 876 | |
48720ba5 | 877 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
73fa21ea CH |
878 | if (!ccw) |
879 | return; | |
880 | ||
48720ba5 HP |
881 | config_area = ccw_device_dma_zalloc(vcdev->cdev, |
882 | VIRTIO_CCW_CONFIG_SIZE); | |
73fa21ea CH |
883 | if (!config_area) |
884 | goto out_free; | |
7e64e059 CH |
885 | |
886 | /* Read the config area from the host. */ | |
73fa21ea CH |
887 | ccw->cmd_code = CCW_CMD_READ_CONF; |
888 | ccw->flags = 0; | |
889 | ccw->count = offset + len; | |
890 | ccw->cda = (__u32)(unsigned long)config_area; | |
891 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); | |
7e64e059 | 892 | if (ret) |
73fa21ea | 893 | goto out_free; |
7e64e059 | 894 | |
2448a299 | 895 | spin_lock_irqsave(&vcdev->lock, flags); |
431dae77 | 896 | memcpy(vcdev->config, config_area, offset + len); |
431dae77 CH |
897 | if (vcdev->config_ready < offset + len) |
898 | vcdev->config_ready = offset + len; | |
2448a299 HP |
899 | spin_unlock_irqrestore(&vcdev->lock, flags); |
900 | if (buf) | |
901 | memcpy(buf, config_area + offset, len); | |
73fa21ea CH |
902 | |
903 | out_free: | |
48720ba5 HP |
904 | ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); |
905 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); | |
7e64e059 CH |
906 | } |
907 | ||
908 | static void virtio_ccw_set_config(struct virtio_device *vdev, | |
909 | unsigned int offset, const void *buf, | |
910 | unsigned len) | |
911 | { | |
912 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
73fa21ea CH |
913 | struct ccw1 *ccw; |
914 | void *config_area; | |
2448a299 | 915 | unsigned long flags; |
73fa21ea | 916 | |
48720ba5 | 917 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
73fa21ea CH |
918 | if (!ccw) |
919 | return; | |
920 | ||
48720ba5 HP |
921 | config_area = ccw_device_dma_zalloc(vcdev->cdev, |
922 | VIRTIO_CCW_CONFIG_SIZE); | |
73fa21ea CH |
923 | if (!config_area) |
924 | goto out_free; | |
7e64e059 | 925 | |
431dae77 CH |
926 | /* Make sure we don't overwrite fields. */ |
927 | if (vcdev->config_ready < offset) | |
928 | virtio_ccw_get_config(vdev, 0, NULL, offset); | |
2448a299 | 929 | spin_lock_irqsave(&vcdev->lock, flags); |
7e64e059 CH |
930 | memcpy(&vcdev->config[offset], buf, len); |
931 | /* Write the config area to the host. */ | |
73fa21ea | 932 | memcpy(config_area, vcdev->config, sizeof(vcdev->config)); |
2448a299 | 933 | spin_unlock_irqrestore(&vcdev->lock, flags); |
73fa21ea CH |
934 | ccw->cmd_code = CCW_CMD_WRITE_CONF; |
935 | ccw->flags = 0; | |
936 | ccw->count = offset + len; | |
937 | ccw->cda = (__u32)(unsigned long)config_area; | |
938 | ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); | |
939 | ||
940 | out_free: | |
48720ba5 HP |
941 | ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); |
942 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); | |
7e64e059 CH |
943 | } |
944 | ||
945 | static u8 virtio_ccw_get_status(struct virtio_device *vdev) | |
946 | { | |
947 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
48720ba5 | 948 | u8 old_status = vcdev->dma_area->status; |
7d3ce5ab PM |
949 | struct ccw1 *ccw; |
950 | ||
951 | if (vcdev->revision < 1) | |
48720ba5 | 952 | return vcdev->dma_area->status; |
7d3ce5ab | 953 | |
48720ba5 | 954 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
7d3ce5ab PM |
955 | if (!ccw) |
956 | return old_status; | |
957 | ||
958 | ccw->cmd_code = CCW_CMD_READ_STATUS; | |
959 | ccw->flags = 0; | |
48720ba5 HP |
960 | ccw->count = sizeof(vcdev->dma_area->status); |
961 | ccw->cda = (__u32)(unsigned long)&vcdev->dma_area->status; | |
7d3ce5ab PM |
962 | ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS); |
963 | /* | |
964 | * If the channel program failed (should only happen if the device | |
965 | * was hotunplugged, and then we clean up via the machine check | |
48720ba5 | 966 | * handler anyway), vcdev->dma_area->status was not overwritten and we just |
7d3ce5ab PM |
967 | * return the old status, which is fine. |
968 | */ | |
48720ba5 | 969 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
7e64e059 | 970 | |
48720ba5 | 971 | return vcdev->dma_area->status; |
7e64e059 CH |
972 | } |
973 | ||
974 | static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) | |
975 | { | |
976 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
48720ba5 | 977 | u8 old_status = vcdev->dma_area->status; |
73fa21ea | 978 | struct ccw1 *ccw; |
48555136 | 979 | int ret; |
73fa21ea | 980 | |
48720ba5 | 981 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
73fa21ea CH |
982 | if (!ccw) |
983 | return; | |
7e64e059 CH |
984 | |
985 | /* Write the status to the host. */ | |
48720ba5 | 986 | vcdev->dma_area->status = status; |
73fa21ea CH |
987 | ccw->cmd_code = CCW_CMD_WRITE_STATUS; |
988 | ccw->flags = 0; | |
989 | ccw->count = sizeof(status); | |
48720ba5 | 990 | ccw->cda = (__u32)(unsigned long)&vcdev->dma_area->status; |
48555136 MT |
991 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); |
992 | /* Write failed? We assume status is unchanged. */ | |
993 | if (ret) | |
48720ba5 HP |
994 | vcdev->dma_area->status = old_status; |
995 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); | |
7e64e059 CH |
996 | } |
997 | ||
971bedca CH |
998 | static const char *virtio_ccw_bus_name(struct virtio_device *vdev) |
999 | { | |
1000 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
1001 | ||
1002 | return dev_name(&vcdev->cdev->dev); | |
1003 | } | |
1004 | ||
0db1dba5 | 1005 | static const struct virtio_config_ops virtio_ccw_config_ops = { |
7e64e059 CH |
1006 | .get_features = virtio_ccw_get_features, |
1007 | .finalize_features = virtio_ccw_finalize_features, | |
1008 | .get = virtio_ccw_get_config, | |
1009 | .set = virtio_ccw_set_config, | |
1010 | .get_status = virtio_ccw_get_status, | |
1011 | .set_status = virtio_ccw_set_status, | |
1012 | .reset = virtio_ccw_reset, | |
1013 | .find_vqs = virtio_ccw_find_vqs, | |
1014 | .del_vqs = virtio_ccw_del_vqs, | |
971bedca | 1015 | .bus_name = virtio_ccw_bus_name, |
7e64e059 CH |
1016 | }; |
1017 | ||
1018 | ||
1019 | /* | |
1020 | * ccw bus driver related functions | |
1021 | */ | |
1022 | ||
1023 | static void virtio_ccw_release_dev(struct device *_d) | |
1024 | { | |
15e90f52 | 1025 | struct virtio_device *dev = dev_to_virtio(_d); |
7e64e059 CH |
1026 | struct virtio_ccw_device *vcdev = to_vc_device(dev); |
1027 | ||
48720ba5 HP |
1028 | ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, |
1029 | sizeof(*vcdev->dma_area)); | |
7e64e059 CH |
1030 | kfree(vcdev); |
1031 | } | |
1032 | ||
1033 | static int irb_is_error(struct irb *irb) | |
1034 | { | |
1035 | if (scsw_cstat(&irb->scsw) != 0) | |
1036 | return 1; | |
1037 | if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) | |
1038 | return 1; | |
1039 | if (scsw_cc(&irb->scsw) != 0) | |
1040 | return 1; | |
1041 | return 0; | |
1042 | } | |
1043 | ||
1044 | static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, | |
1045 | int index) | |
1046 | { | |
1047 | struct virtio_ccw_vq_info *info; | |
1048 | unsigned long flags; | |
1049 | struct virtqueue *vq; | |
1050 | ||
1051 | vq = NULL; | |
1052 | spin_lock_irqsave(&vcdev->lock, flags); | |
1053 | list_for_each_entry(info, &vcdev->virtqueues, node) { | |
9d0ca6ed | 1054 | if (info->vq->index == index) { |
7e64e059 CH |
1055 | vq = info->vq; |
1056 | break; | |
1057 | } | |
1058 | } | |
1059 | spin_unlock_irqrestore(&vcdev->lock, flags); | |
1060 | return vq; | |
1061 | } | |
1062 | ||
74a599f0 CH |
1063 | static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, |
1064 | __u32 activity) | |
1065 | { | |
1066 | if (vcdev->curr_io & activity) { | |
1067 | switch (activity) { | |
1068 | case VIRTIO_CCW_DOING_READ_FEAT: | |
1069 | case VIRTIO_CCW_DOING_WRITE_FEAT: | |
1070 | case VIRTIO_CCW_DOING_READ_CONFIG: | |
1071 | case VIRTIO_CCW_DOING_WRITE_CONFIG: | |
1072 | case VIRTIO_CCW_DOING_WRITE_STATUS: | |
7d3ce5ab | 1073 | case VIRTIO_CCW_DOING_READ_STATUS: |
74a599f0 CH |
1074 | case VIRTIO_CCW_DOING_SET_VQ: |
1075 | case VIRTIO_CCW_DOING_SET_IND: | |
1076 | case VIRTIO_CCW_DOING_SET_CONF_IND: | |
1077 | case VIRTIO_CCW_DOING_RESET: | |
1078 | case VIRTIO_CCW_DOING_READ_VQ_CONF: | |
1079 | case VIRTIO_CCW_DOING_SET_IND_ADAPTER: | |
1080 | case VIRTIO_CCW_DOING_SET_VIRTIO_REV: | |
1081 | vcdev->curr_io &= ~activity; | |
1082 | wake_up(&vcdev->wait_q); | |
1083 | break; | |
1084 | default: | |
1085 | /* don't know what to do... */ | |
1086 | dev_warn(&vcdev->cdev->dev, | |
1087 | "Suspicious activity '%08x'\n", activity); | |
1088 | WARN_ON(1); | |
1089 | break; | |
1090 | } | |
1091 | } | |
1092 | } | |
1093 | ||
7e64e059 CH |
1094 | static void virtio_ccw_int_handler(struct ccw_device *cdev, |
1095 | unsigned long intparm, | |
1096 | struct irb *irb) | |
1097 | { | |
1098 | __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; | |
1099 | struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); | |
1100 | int i; | |
1101 | struct virtqueue *vq; | |
7e64e059 | 1102 | |
2e021043 HG |
1103 | if (!vcdev) |
1104 | return; | |
74a599f0 CH |
1105 | if (IS_ERR(irb)) { |
1106 | vcdev->err = PTR_ERR(irb); | |
1107 | virtio_ccw_check_activity(vcdev, activity); | |
1108 | /* Don't poke around indicators, something's wrong. */ | |
1109 | return; | |
1110 | } | |
7e64e059 CH |
1111 | /* Check if it's a notification from the host. */ |
1112 | if ((intparm == 0) && | |
1113 | (scsw_stctl(&irb->scsw) == | |
1114 | (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { | |
1115 | /* OK */ | |
1116 | } | |
19e4735b CH |
1117 | if (irb_is_error(irb)) { |
1118 | /* Command reject? */ | |
1119 | if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && | |
1120 | (irb->ecw[0] & SNS0_CMD_REJECT)) | |
1121 | vcdev->err = -EOPNOTSUPP; | |
1122 | else | |
1123 | /* Map everything else to -EIO. */ | |
1124 | vcdev->err = -EIO; | |
1125 | } | |
74a599f0 | 1126 | virtio_ccw_check_activity(vcdev, activity); |
22a4a639 HP |
1127 | for_each_set_bit(i, indicators(vcdev), |
1128 | sizeof(*indicators(vcdev)) * BITS_PER_BYTE) { | |
7e64e059 | 1129 | /* The bit clear must happen before the vring kick. */ |
22a4a639 | 1130 | clear_bit(i, indicators(vcdev)); |
7e64e059 CH |
1131 | barrier(); |
1132 | vq = virtio_ccw_vq_by_ind(vcdev, i); | |
1133 | vring_interrupt(0, vq); | |
1134 | } | |
22a4a639 | 1135 | if (test_bit(0, indicators2(vcdev))) { |
016c98c6 | 1136 | virtio_config_changed(&vcdev->vdev); |
22a4a639 | 1137 | clear_bit(0, indicators2(vcdev)); |
7e64e059 CH |
1138 | } |
1139 | } | |
1140 | ||
1141 | /* | |
1142 | * We usually want to autoonline all devices, but give the admin | |
1143 | * a way to exempt devices from this. | |
1144 | */ | |
1145 | #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ | |
1146 | (8*sizeof(long))) | |
1147 | static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; | |
1148 | ||
1149 | static char *no_auto = ""; | |
1150 | ||
1151 | module_param(no_auto, charp, 0444); | |
1152 | MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); | |
1153 | ||
1154 | static int virtio_ccw_check_autoonline(struct ccw_device *cdev) | |
1155 | { | |
1156 | struct ccw_dev_id id; | |
1157 | ||
1158 | ccw_device_get_id(cdev, &id); | |
1159 | if (test_bit(id.devno, devs_no_auto[id.ssid])) | |
1160 | return 0; | |
1161 | return 1; | |
1162 | } | |
1163 | ||
1164 | static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) | |
1165 | { | |
1166 | struct ccw_device *cdev = data; | |
1167 | int ret; | |
1168 | ||
1169 | ret = ccw_device_set_online(cdev); | |
1170 | if (ret) | |
1171 | dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); | |
1172 | } | |
1173 | ||
1174 | static int virtio_ccw_probe(struct ccw_device *cdev) | |
1175 | { | |
1176 | cdev->handler = virtio_ccw_int_handler; | |
1177 | ||
1178 | if (virtio_ccw_check_autoonline(cdev)) | |
1179 | async_schedule(virtio_ccw_auto_online, cdev); | |
1180 | return 0; | |
1181 | } | |
1182 | ||
2e021043 HG |
1183 | static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) |
1184 | { | |
1185 | unsigned long flags; | |
1186 | struct virtio_ccw_device *vcdev; | |
1187 | ||
1188 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1189 | vcdev = dev_get_drvdata(&cdev->dev); | |
79629b20 | 1190 | if (!vcdev || vcdev->going_away) { |
2e021043 HG |
1191 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
1192 | return NULL; | |
1193 | } | |
79629b20 | 1194 | vcdev->going_away = true; |
2e021043 HG |
1195 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
1196 | return vcdev; | |
1197 | } | |
1198 | ||
7e64e059 CH |
1199 | static void virtio_ccw_remove(struct ccw_device *cdev) |
1200 | { | |
79629b20 | 1201 | unsigned long flags; |
2e021043 | 1202 | struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); |
7e64e059 | 1203 | |
e75279c4 HG |
1204 | if (vcdev && cdev->online) { |
1205 | if (vcdev->device_lost) | |
1206 | virtio_break_device(&vcdev->vdev); | |
7e64e059 | 1207 | unregister_virtio_device(&vcdev->vdev); |
e75279c4 HG |
1208 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
1209 | dev_set_drvdata(&cdev->dev, NULL); | |
1210 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1211 | } | |
7e64e059 CH |
1212 | cdev->handler = NULL; |
1213 | } | |
1214 | ||
1215 | static int virtio_ccw_offline(struct ccw_device *cdev) | |
1216 | { | |
79629b20 | 1217 | unsigned long flags; |
2e021043 | 1218 | struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); |
7e64e059 | 1219 | |
e75279c4 HG |
1220 | if (!vcdev) |
1221 | return 0; | |
1222 | if (vcdev->device_lost) | |
1223 | virtio_break_device(&vcdev->vdev); | |
1224 | unregister_virtio_device(&vcdev->vdev); | |
1225 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1226 | dev_set_drvdata(&cdev->dev, NULL); | |
1227 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
7e64e059 CH |
1228 | return 0; |
1229 | } | |
1230 | ||
6bb2c835 TH |
1231 | static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) |
1232 | { | |
1233 | struct virtio_rev_info *rev; | |
1234 | struct ccw1 *ccw; | |
1235 | int ret; | |
1236 | ||
48720ba5 | 1237 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
6bb2c835 TH |
1238 | if (!ccw) |
1239 | return -ENOMEM; | |
48720ba5 | 1240 | rev = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*rev)); |
6bb2c835 | 1241 | if (!rev) { |
48720ba5 | 1242 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
6bb2c835 TH |
1243 | return -ENOMEM; |
1244 | } | |
1245 | ||
1246 | /* Set transport revision */ | |
1247 | ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; | |
1248 | ccw->flags = 0; | |
1249 | ccw->count = sizeof(*rev); | |
1250 | ccw->cda = (__u32)(unsigned long)rev; | |
1251 | ||
1252 | vcdev->revision = VIRTIO_CCW_REV_MAX; | |
1253 | do { | |
1254 | rev->revision = vcdev->revision; | |
1255 | /* none of our supported revisions carry payload */ | |
1256 | rev->length = 0; | |
1257 | ret = ccw_io_helper(vcdev, ccw, | |
1258 | VIRTIO_CCW_DOING_SET_VIRTIO_REV); | |
1259 | if (ret == -EOPNOTSUPP) { | |
1260 | if (vcdev->revision == 0) | |
1261 | /* | |
1262 | * The host device does not support setting | |
1263 | * the revision: let's operate it in legacy | |
1264 | * mode. | |
1265 | */ | |
1266 | ret = 0; | |
1267 | else | |
1268 | vcdev->revision--; | |
1269 | } | |
1270 | } while (ret == -EOPNOTSUPP); | |
1271 | ||
48720ba5 HP |
1272 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
1273 | ccw_device_dma_free(vcdev->cdev, rev, sizeof(*rev)); | |
6bb2c835 TH |
1274 | return ret; |
1275 | } | |
7e64e059 | 1276 | |
7e64e059 CH |
1277 | static int virtio_ccw_online(struct ccw_device *cdev) |
1278 | { | |
1279 | int ret; | |
1280 | struct virtio_ccw_device *vcdev; | |
2e021043 | 1281 | unsigned long flags; |
7e64e059 CH |
1282 | |
1283 | vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); | |
1284 | if (!vcdev) { | |
1285 | dev_warn(&cdev->dev, "Could not get memory for virtio\n"); | |
1286 | ret = -ENOMEM; | |
1287 | goto out_free; | |
1288 | } | |
f35f54f1 | 1289 | vcdev->vdev.dev.parent = &cdev->dev; |
48720ba5 HP |
1290 | vcdev->cdev = cdev; |
1291 | vcdev->dma_area = ccw_device_dma_zalloc(vcdev->cdev, | |
1292 | sizeof(*vcdev->dma_area)); | |
1293 | if (!vcdev->dma_area) { | |
7e64e059 CH |
1294 | ret = -ENOMEM; |
1295 | goto out_free; | |
1296 | } | |
1297 | ||
96b14536 CH |
1298 | vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ |
1299 | ||
7e64e059 CH |
1300 | vcdev->vdev.dev.release = virtio_ccw_release_dev; |
1301 | vcdev->vdev.config = &virtio_ccw_config_ops; | |
7e64e059 CH |
1302 | init_waitqueue_head(&vcdev->wait_q); |
1303 | INIT_LIST_HEAD(&vcdev->virtqueues); | |
1304 | spin_lock_init(&vcdev->lock); | |
78b1a52e | 1305 | mutex_init(&vcdev->io_lock); |
7e64e059 | 1306 | |
2e021043 | 1307 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
7e64e059 | 1308 | dev_set_drvdata(&cdev->dev, vcdev); |
2e021043 | 1309 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
7e64e059 CH |
1310 | vcdev->vdev.id.vendor = cdev->id.cu_type; |
1311 | vcdev->vdev.id.device = cdev->id.cu_model; | |
6bb2c835 | 1312 | |
2003a7a5 MT |
1313 | ret = virtio_ccw_set_transport_rev(vcdev); |
1314 | if (ret) | |
1315 | goto out_free; | |
6bb2c835 | 1316 | |
7e64e059 CH |
1317 | ret = register_virtio_device(&vcdev->vdev); |
1318 | if (ret) { | |
1319 | dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", | |
1320 | ret); | |
1321 | goto out_put; | |
1322 | } | |
1323 | return 0; | |
1324 | out_put: | |
2e021043 | 1325 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
7e64e059 | 1326 | dev_set_drvdata(&cdev->dev, NULL); |
2e021043 | 1327 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
7e64e059 CH |
1328 | put_device(&vcdev->vdev.dev); |
1329 | return ret; | |
1330 | out_free: | |
1331 | if (vcdev) { | |
48720ba5 HP |
1332 | ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, |
1333 | sizeof(*vcdev->dma_area)); | |
7e64e059 CH |
1334 | } |
1335 | kfree(vcdev); | |
1336 | return ret; | |
1337 | } | |
1338 | ||
1339 | static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) | |
1340 | { | |
e75279c4 HG |
1341 | int rc; |
1342 | struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); | |
1343 | ||
1344 | /* | |
1345 | * Make sure vcdev is set | |
1346 | * i.e. set_offline/remove callback not already running | |
1347 | */ | |
1348 | if (!vcdev) | |
1349 | return NOTIFY_DONE; | |
1350 | ||
1351 | switch (event) { | |
1352 | case CIO_GONE: | |
1353 | vcdev->device_lost = true; | |
1354 | rc = NOTIFY_DONE; | |
1355 | break; | |
fa08a3b4 CB |
1356 | case CIO_OPER: |
1357 | rc = NOTIFY_OK; | |
1358 | break; | |
e75279c4 HG |
1359 | default: |
1360 | rc = NOTIFY_DONE; | |
1361 | break; | |
1362 | } | |
1363 | return rc; | |
7e64e059 CH |
1364 | } |
1365 | ||
1366 | static struct ccw_device_id virtio_ids[] = { | |
1367 | { CCW_DEVICE(0x3832, 0) }, | |
1368 | {}, | |
1369 | }; | |
7e64e059 | 1370 | |
fa08a3b4 CB |
1371 | #ifdef CONFIG_PM_SLEEP |
1372 | static int virtio_ccw_freeze(struct ccw_device *cdev) | |
1373 | { | |
1374 | struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); | |
1375 | ||
1376 | return virtio_device_freeze(&vcdev->vdev); | |
1377 | } | |
1378 | ||
1379 | static int virtio_ccw_restore(struct ccw_device *cdev) | |
1380 | { | |
1381 | struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); | |
1382 | int ret; | |
1383 | ||
1384 | ret = virtio_ccw_set_transport_rev(vcdev); | |
1385 | if (ret) | |
1386 | return ret; | |
1387 | ||
1388 | return virtio_device_restore(&vcdev->vdev); | |
1389 | } | |
1390 | #endif | |
1391 | ||
7e64e059 CH |
1392 | static struct ccw_driver virtio_ccw_driver = { |
1393 | .driver = { | |
1394 | .owner = THIS_MODULE, | |
1395 | .name = "virtio_ccw", | |
1396 | }, | |
1397 | .ids = virtio_ids, | |
1398 | .probe = virtio_ccw_probe, | |
1399 | .remove = virtio_ccw_remove, | |
1400 | .set_offline = virtio_ccw_offline, | |
1401 | .set_online = virtio_ccw_online, | |
1402 | .notify = virtio_ccw_cio_notify, | |
89f88337 | 1403 | .int_class = IRQIO_VIR, |
fa08a3b4 CB |
1404 | #ifdef CONFIG_PM_SLEEP |
1405 | .freeze = virtio_ccw_freeze, | |
1406 | .thaw = virtio_ccw_restore, | |
1407 | .restore = virtio_ccw_restore, | |
1408 | #endif | |
7e64e059 CH |
1409 | }; |
1410 | ||
1411 | static int __init pure_hex(char **cp, unsigned int *val, int min_digit, | |
1412 | int max_digit, int max_val) | |
1413 | { | |
1414 | int diff; | |
1415 | ||
1416 | diff = 0; | |
1417 | *val = 0; | |
1418 | ||
1419 | while (diff <= max_digit) { | |
1420 | int value = hex_to_bin(**cp); | |
1421 | ||
1422 | if (value < 0) | |
1423 | break; | |
1424 | *val = *val * 16 + value; | |
1425 | (*cp)++; | |
1426 | diff++; | |
1427 | } | |
1428 | ||
1429 | if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) | |
1430 | return 1; | |
1431 | ||
1432 | return 0; | |
1433 | } | |
1434 | ||
1435 | static int __init parse_busid(char *str, unsigned int *cssid, | |
1436 | unsigned int *ssid, unsigned int *devno) | |
1437 | { | |
1438 | char *str_work; | |
1439 | int rc, ret; | |
1440 | ||
1441 | rc = 1; | |
1442 | ||
1443 | if (*str == '\0') | |
1444 | goto out; | |
1445 | ||
1446 | str_work = str; | |
1447 | ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); | |
1448 | if (ret || (str_work[0] != '.')) | |
1449 | goto out; | |
1450 | str_work++; | |
1451 | ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); | |
1452 | if (ret || (str_work[0] != '.')) | |
1453 | goto out; | |
1454 | str_work++; | |
1455 | ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); | |
1456 | if (ret || (str_work[0] != '\0')) | |
1457 | goto out; | |
1458 | ||
1459 | rc = 0; | |
1460 | out: | |
1461 | return rc; | |
1462 | } | |
1463 | ||
1464 | static void __init no_auto_parse(void) | |
1465 | { | |
1466 | unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; | |
1467 | char *parm, *str; | |
1468 | int rc; | |
1469 | ||
1470 | str = no_auto; | |
1471 | while ((parm = strsep(&str, ","))) { | |
1472 | rc = parse_busid(strsep(&parm, "-"), &from_cssid, | |
1473 | &from_ssid, &from); | |
1474 | if (rc) | |
1475 | continue; | |
1476 | if (parm != NULL) { | |
1477 | rc = parse_busid(parm, &to_cssid, | |
1478 | &to_ssid, &to); | |
1479 | if ((from_ssid > to_ssid) || | |
1480 | ((from_ssid == to_ssid) && (from > to))) | |
1481 | rc = -EINVAL; | |
1482 | } else { | |
1483 | to_cssid = from_cssid; | |
1484 | to_ssid = from_ssid; | |
1485 | to = from; | |
1486 | } | |
1487 | if (rc) | |
1488 | continue; | |
1489 | while ((from_ssid < to_ssid) || | |
1490 | ((from_ssid == to_ssid) && (from <= to))) { | |
1491 | set_bit(from, devs_no_auto[from_ssid]); | |
1492 | from++; | |
1493 | if (from > __MAX_SUBCHANNEL) { | |
1494 | from_ssid++; | |
1495 | from = 0; | |
1496 | } | |
1497 | } | |
1498 | } | |
1499 | } | |
1500 | ||
1501 | static int __init virtio_ccw_init(void) | |
1502 | { | |
39c7dcb1 HP |
1503 | int rc; |
1504 | ||
7e64e059 CH |
1505 | /* parse no_auto string before we do anything further */ |
1506 | no_auto_parse(); | |
39c7dcb1 HP |
1507 | |
1508 | summary_indicators = cio_dma_zalloc(MAX_AIRQ_AREAS); | |
1509 | if (!summary_indicators) | |
1510 | return -ENOMEM; | |
1511 | rc = ccw_driver_register(&virtio_ccw_driver); | |
1512 | if (rc) | |
1513 | cio_dma_free(summary_indicators, MAX_AIRQ_AREAS); | |
1514 | return rc; | |
7e64e059 | 1515 | } |
acc50ec7 | 1516 | device_initcall(virtio_ccw_init); |