Commit | Line | Data |
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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; | |
3a232277 | 65 | rwlock_t irq_lock; |
78b1a52e | 66 | struct mutex io_lock; /* Serializes I/O requests */ |
7e64e059 | 67 | struct list_head virtqueues; |
96b14536 | 68 | bool is_thinint; |
79629b20 | 69 | bool going_away; |
e75279c4 | 70 | bool device_lost; |
431dae77 | 71 | unsigned int config_ready; |
96b14536 | 72 | void *airq_info; |
48720ba5 | 73 | struct vcdev_dma_area *dma_area; |
7e64e059 CH |
74 | }; |
75 | ||
22a4a639 HP |
76 | static inline unsigned long *indicators(struct virtio_ccw_device *vcdev) |
77 | { | |
48720ba5 | 78 | return &vcdev->dma_area->indicators; |
22a4a639 HP |
79 | } |
80 | ||
81 | static inline unsigned long *indicators2(struct virtio_ccw_device *vcdev) | |
82 | { | |
48720ba5 | 83 | return &vcdev->dma_area->indicators2; |
22a4a639 HP |
84 | } |
85 | ||
d4674240 | 86 | struct vq_info_block_legacy { |
7e64e059 CH |
87 | __u64 queue; |
88 | __u32 align; | |
89 | __u16 index; | |
90 | __u16 num; | |
91 | } __packed; | |
92 | ||
d4674240 CH |
93 | struct vq_info_block { |
94 | __u64 desc; | |
95 | __u32 res0; | |
96 | __u16 index; | |
97 | __u16 num; | |
98 | __u64 avail; | |
99 | __u64 used; | |
100 | } __packed; | |
101 | ||
7e64e059 | 102 | struct virtio_feature_desc { |
fb317002 | 103 | __le32 features; |
7e64e059 CH |
104 | __u8 index; |
105 | } __packed; | |
106 | ||
96b14536 CH |
107 | struct virtio_thinint_area { |
108 | unsigned long summary_indicator; | |
109 | unsigned long indicator; | |
110 | u64 bit_nr; | |
111 | u8 isc; | |
112 | } __packed; | |
113 | ||
6bb2c835 TH |
114 | struct virtio_rev_info { |
115 | __u16 revision; | |
116 | __u16 length; | |
117 | __u8 data[]; | |
118 | }; | |
119 | ||
120 | /* the highest virtio-ccw revision we support */ | |
182f709c | 121 | #define VIRTIO_CCW_REV_MAX 2 |
6bb2c835 | 122 | |
7e64e059 CH |
123 | struct virtio_ccw_vq_info { |
124 | struct virtqueue *vq; | |
125 | int num; | |
d4674240 CH |
126 | union { |
127 | struct vq_info_block s; | |
128 | struct vq_info_block_legacy l; | |
129 | } *info_block; | |
96b14536 | 130 | int bit_nr; |
7e64e059 | 131 | struct list_head node; |
07e16933 | 132 | long cookie; |
7e64e059 CH |
133 | }; |
134 | ||
96b14536 CH |
135 | #define VIRTIO_AIRQ_ISC IO_SCH_ISC /* inherit from subchannel */ |
136 | ||
137 | #define VIRTIO_IV_BITS (L1_CACHE_BYTES * 8) | |
138 | #define MAX_AIRQ_AREAS 20 | |
139 | ||
140 | static int virtio_ccw_use_airq = 1; | |
141 | ||
142 | struct airq_info { | |
143 | rwlock_t lock; | |
39c7dcb1 | 144 | u8 summary_indicator_idx; |
96b14536 CH |
145 | struct airq_struct airq; |
146 | struct airq_iv *aiv; | |
147 | }; | |
148 | static struct airq_info *airq_areas[MAX_AIRQ_AREAS]; | |
4f419eb1 HP |
149 | static DEFINE_MUTEX(airq_areas_lock); |
150 | ||
39c7dcb1 HP |
151 | static u8 *summary_indicators; |
152 | ||
153 | static inline u8 *get_summary_indicator(struct airq_info *info) | |
154 | { | |
155 | return summary_indicators + info->summary_indicator_idx; | |
156 | } | |
96b14536 | 157 | |
7e64e059 CH |
158 | #define CCW_CMD_SET_VQ 0x13 |
159 | #define CCW_CMD_VDEV_RESET 0x33 | |
160 | #define CCW_CMD_SET_IND 0x43 | |
161 | #define CCW_CMD_SET_CONF_IND 0x53 | |
162 | #define CCW_CMD_READ_FEAT 0x12 | |
163 | #define CCW_CMD_WRITE_FEAT 0x11 | |
164 | #define CCW_CMD_READ_CONF 0x22 | |
165 | #define CCW_CMD_WRITE_CONF 0x21 | |
166 | #define CCW_CMD_WRITE_STATUS 0x31 | |
167 | #define CCW_CMD_READ_VQ_CONF 0x32 | |
7d3ce5ab | 168 | #define CCW_CMD_READ_STATUS 0x72 |
96b14536 | 169 | #define CCW_CMD_SET_IND_ADAPTER 0x73 |
6bb2c835 | 170 | #define CCW_CMD_SET_VIRTIO_REV 0x83 |
7e64e059 CH |
171 | |
172 | #define VIRTIO_CCW_DOING_SET_VQ 0x00010000 | |
173 | #define VIRTIO_CCW_DOING_RESET 0x00040000 | |
174 | #define VIRTIO_CCW_DOING_READ_FEAT 0x00080000 | |
175 | #define VIRTIO_CCW_DOING_WRITE_FEAT 0x00100000 | |
176 | #define VIRTIO_CCW_DOING_READ_CONFIG 0x00200000 | |
177 | #define VIRTIO_CCW_DOING_WRITE_CONFIG 0x00400000 | |
178 | #define VIRTIO_CCW_DOING_WRITE_STATUS 0x00800000 | |
179 | #define VIRTIO_CCW_DOING_SET_IND 0x01000000 | |
180 | #define VIRTIO_CCW_DOING_READ_VQ_CONF 0x02000000 | |
181 | #define VIRTIO_CCW_DOING_SET_CONF_IND 0x04000000 | |
96b14536 | 182 | #define VIRTIO_CCW_DOING_SET_IND_ADAPTER 0x08000000 |
6bb2c835 | 183 | #define VIRTIO_CCW_DOING_SET_VIRTIO_REV 0x10000000 |
7d3ce5ab | 184 | #define VIRTIO_CCW_DOING_READ_STATUS 0x20000000 |
7e64e059 CH |
185 | #define VIRTIO_CCW_INTPARM_MASK 0xffff0000 |
186 | ||
187 | static struct virtio_ccw_device *to_vc_device(struct virtio_device *vdev) | |
188 | { | |
189 | return container_of(vdev, struct virtio_ccw_device, vdev); | |
190 | } | |
191 | ||
96b14536 CH |
192 | static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info) |
193 | { | |
194 | unsigned long i, flags; | |
195 | ||
196 | write_lock_irqsave(&info->lock, flags); | |
197 | for (i = 0; i < airq_iv_end(info->aiv); i++) { | |
198 | if (vq == (void *)airq_iv_get_ptr(info->aiv, i)) { | |
199 | airq_iv_free_bit(info->aiv, i); | |
200 | airq_iv_set_ptr(info->aiv, i, 0); | |
201 | break; | |
202 | } | |
203 | } | |
204 | write_unlock_irqrestore(&info->lock, flags); | |
205 | } | |
206 | ||
30e63ef2 | 207 | static void virtio_airq_handler(struct airq_struct *airq, bool floating) |
96b14536 CH |
208 | { |
209 | struct airq_info *info = container_of(airq, struct airq_info, airq); | |
210 | unsigned long ai; | |
211 | ||
212 | inc_irq_stat(IRQIO_VAI); | |
213 | read_lock(&info->lock); | |
214 | /* Walk through indicators field, summary indicator active. */ | |
215 | for (ai = 0;;) { | |
216 | ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); | |
217 | if (ai == -1UL) | |
218 | break; | |
219 | vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); | |
220 | } | |
39c7dcb1 | 221 | *(get_summary_indicator(info)) = 0; |
96b14536 CH |
222 | smp_wmb(); |
223 | /* Walk through indicators field, summary indicator not active. */ | |
224 | for (ai = 0;;) { | |
225 | ai = airq_iv_scan(info->aiv, ai, airq_iv_end(info->aiv)); | |
226 | if (ai == -1UL) | |
227 | break; | |
228 | vring_interrupt(0, (void *)airq_iv_get_ptr(info->aiv, ai)); | |
229 | } | |
230 | read_unlock(&info->lock); | |
231 | } | |
232 | ||
39c7dcb1 | 233 | static struct airq_info *new_airq_info(int index) |
96b14536 CH |
234 | { |
235 | struct airq_info *info; | |
236 | int rc; | |
237 | ||
238 | info = kzalloc(sizeof(*info), GFP_KERNEL); | |
239 | if (!info) | |
240 | return NULL; | |
241 | rwlock_init(&info->lock); | |
01b3fb1e HP |
242 | info->aiv = airq_iv_create(VIRTIO_IV_BITS, AIRQ_IV_ALLOC | AIRQ_IV_PTR |
243 | | AIRQ_IV_CACHELINE); | |
96b14536 CH |
244 | if (!info->aiv) { |
245 | kfree(info); | |
246 | return NULL; | |
247 | } | |
248 | info->airq.handler = virtio_airq_handler; | |
39c7dcb1 HP |
249 | info->summary_indicator_idx = index; |
250 | info->airq.lsi_ptr = get_summary_indicator(info); | |
96b14536 CH |
251 | info->airq.lsi_mask = 0xff; |
252 | info->airq.isc = VIRTIO_AIRQ_ISC; | |
253 | rc = register_adapter_interrupt(&info->airq); | |
254 | if (rc) { | |
255 | airq_iv_release(info->aiv); | |
256 | kfree(info); | |
257 | return NULL; | |
258 | } | |
259 | return info; | |
260 | } | |
261 | ||
96b14536 CH |
262 | static unsigned long get_airq_indicator(struct virtqueue *vqs[], int nvqs, |
263 | u64 *first, void **airq_info) | |
264 | { | |
265 | int i, j; | |
266 | struct airq_info *info; | |
267 | unsigned long indicator_addr = 0; | |
268 | unsigned long bit, flags; | |
269 | ||
270 | for (i = 0; i < MAX_AIRQ_AREAS && !indicator_addr; i++) { | |
4f419eb1 | 271 | mutex_lock(&airq_areas_lock); |
96b14536 | 272 | if (!airq_areas[i]) |
39c7dcb1 | 273 | airq_areas[i] = new_airq_info(i); |
96b14536 | 274 | info = airq_areas[i]; |
4f419eb1 | 275 | mutex_unlock(&airq_areas_lock); |
96b14536 CH |
276 | if (!info) |
277 | return 0; | |
278 | write_lock_irqsave(&info->lock, flags); | |
279 | bit = airq_iv_alloc(info->aiv, nvqs); | |
280 | if (bit == -1UL) { | |
281 | /* Not enough vacancies. */ | |
282 | write_unlock_irqrestore(&info->lock, flags); | |
283 | continue; | |
284 | } | |
285 | *first = bit; | |
286 | *airq_info = info; | |
287 | indicator_addr = (unsigned long)info->aiv->vector; | |
288 | for (j = 0; j < nvqs; j++) { | |
289 | airq_iv_set_ptr(info->aiv, bit + j, | |
290 | (unsigned long)vqs[j]); | |
291 | } | |
292 | write_unlock_irqrestore(&info->lock, flags); | |
293 | } | |
294 | return indicator_addr; | |
295 | } | |
296 | ||
297 | static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev) | |
298 | { | |
299 | struct virtio_ccw_vq_info *info; | |
300 | ||
3438b2c0 HP |
301 | if (!vcdev->airq_info) |
302 | return; | |
96b14536 CH |
303 | list_for_each_entry(info, &vcdev->virtqueues, node) |
304 | drop_airq_indicator(info->vq, vcdev->airq_info); | |
305 | } | |
306 | ||
7e64e059 CH |
307 | static int doing_io(struct virtio_ccw_device *vcdev, __u32 flag) |
308 | { | |
309 | unsigned long flags; | |
310 | __u32 ret; | |
311 | ||
312 | spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); | |
313 | if (vcdev->err) | |
314 | ret = 0; | |
315 | else | |
316 | ret = vcdev->curr_io & flag; | |
317 | spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); | |
318 | return ret; | |
319 | } | |
320 | ||
73fa21ea CH |
321 | static int ccw_io_helper(struct virtio_ccw_device *vcdev, |
322 | struct ccw1 *ccw, __u32 intparm) | |
7e64e059 CH |
323 | { |
324 | int ret; | |
325 | unsigned long flags; | |
326 | int flag = intparm & VIRTIO_CCW_INTPARM_MASK; | |
327 | ||
78b1a52e | 328 | mutex_lock(&vcdev->io_lock); |
b26ba22b CB |
329 | do { |
330 | spin_lock_irqsave(get_ccwdev_lock(vcdev->cdev), flags); | |
331 | ret = ccw_device_start(vcdev->cdev, ccw, intparm, 0, 0); | |
99437a27 CH |
332 | if (!ret) { |
333 | if (!vcdev->curr_io) | |
334 | vcdev->err = 0; | |
b26ba22b | 335 | vcdev->curr_io |= flag; |
99437a27 | 336 | } |
b26ba22b CB |
337 | spin_unlock_irqrestore(get_ccwdev_lock(vcdev->cdev), flags); |
338 | cpu_relax(); | |
339 | } while (ret == -EBUSY); | |
7e64e059 | 340 | wait_event(vcdev->wait_q, doing_io(vcdev, flag) == 0); |
78b1a52e HP |
341 | ret = ret ? ret : vcdev->err; |
342 | mutex_unlock(&vcdev->io_lock); | |
343 | return ret; | |
7e64e059 CH |
344 | } |
345 | ||
96b14536 CH |
346 | static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev, |
347 | struct ccw1 *ccw) | |
348 | { | |
349 | int ret; | |
350 | unsigned long *indicatorp = NULL; | |
351 | struct virtio_thinint_area *thinint_area = NULL; | |
352 | struct airq_info *airq_info = vcdev->airq_info; | |
353 | ||
354 | if (vcdev->is_thinint) { | |
48720ba5 HP |
355 | thinint_area = ccw_device_dma_zalloc(vcdev->cdev, |
356 | sizeof(*thinint_area)); | |
96b14536 CH |
357 | if (!thinint_area) |
358 | return; | |
359 | thinint_area->summary_indicator = | |
39c7dcb1 | 360 | (unsigned long) get_summary_indicator(airq_info); |
96b14536 CH |
361 | thinint_area->isc = VIRTIO_AIRQ_ISC; |
362 | ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; | |
363 | ccw->count = sizeof(*thinint_area); | |
364 | ccw->cda = (__u32)(unsigned long) thinint_area; | |
365 | } else { | |
c235082b | 366 | /* payload is the address of the indicators */ |
48720ba5 HP |
367 | indicatorp = ccw_device_dma_zalloc(vcdev->cdev, |
368 | sizeof(indicators(vcdev))); | |
96b14536 CH |
369 | if (!indicatorp) |
370 | return; | |
371 | *indicatorp = 0; | |
372 | ccw->cmd_code = CCW_CMD_SET_IND; | |
22a4a639 | 373 | ccw->count = sizeof(indicators(vcdev)); |
96b14536 CH |
374 | ccw->cda = (__u32)(unsigned long) indicatorp; |
375 | } | |
376 | /* Deregister indicators from host. */ | |
22a4a639 | 377 | *indicators(vcdev) = 0; |
96b14536 CH |
378 | ccw->flags = 0; |
379 | ret = ccw_io_helper(vcdev, ccw, | |
380 | vcdev->is_thinint ? | |
381 | VIRTIO_CCW_DOING_SET_IND_ADAPTER : | |
382 | VIRTIO_CCW_DOING_SET_IND); | |
383 | if (ret && (ret != -ENODEV)) | |
384 | dev_info(&vcdev->cdev->dev, | |
385 | "Failed to deregister indicators (%d)\n", ret); | |
386 | else if (vcdev->is_thinint) | |
387 | virtio_ccw_drop_indicators(vcdev); | |
48720ba5 HP |
388 | ccw_device_dma_free(vcdev->cdev, indicatorp, sizeof(indicators(vcdev))); |
389 | ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area)); | |
96b14536 CH |
390 | } |
391 | ||
46f9c2b9 | 392 | static bool virtio_ccw_kvm_notify(struct virtqueue *vq) |
7e64e059 CH |
393 | { |
394 | struct virtio_ccw_vq_info *info = vq->priv; | |
395 | struct virtio_ccw_device *vcdev; | |
396 | struct subchannel_id schid; | |
397 | ||
398 | vcdev = to_vc_device(info->vq->vdev); | |
399 | ccw_device_get_schid(vcdev->cdev, &schid); | |
e5e1bdf0 HC |
400 | BUILD_BUG_ON(sizeof(struct subchannel_id) != sizeof(unsigned int)); |
401 | info->cookie = kvm_hypercall3(KVM_S390_VIRTIO_CCW_NOTIFY, | |
402 | *((unsigned int *)&schid), | |
403 | vq->index, info->cookie); | |
46f9c2b9 HG |
404 | if (info->cookie < 0) |
405 | return false; | |
406 | return true; | |
7e64e059 CH |
407 | } |
408 | ||
73fa21ea CH |
409 | static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, |
410 | struct ccw1 *ccw, int index) | |
7e64e059 | 411 | { |
ad2aa042 PM |
412 | int ret; |
413 | ||
48720ba5 | 414 | vcdev->dma_area->config_block.index = index; |
73fa21ea CH |
415 | ccw->cmd_code = CCW_CMD_READ_VQ_CONF; |
416 | ccw->flags = 0; | |
417 | ccw->count = sizeof(struct vq_config_block); | |
48720ba5 | 418 | ccw->cda = (__u32)(unsigned long)(&vcdev->dma_area->config_block); |
ad2aa042 PM |
419 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF); |
420 | if (ret) | |
421 | return ret; | |
48720ba5 | 422 | return vcdev->dma_area->config_block.num ?: -ENOENT; |
7e64e059 CH |
423 | } |
424 | ||
73fa21ea | 425 | static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw) |
7e64e059 CH |
426 | { |
427 | struct virtio_ccw_device *vcdev = to_vc_device(vq->vdev); | |
428 | struct virtio_ccw_vq_info *info = vq->priv; | |
429 | unsigned long flags; | |
7e64e059 | 430 | int ret; |
9d0ca6ed | 431 | unsigned int index = vq->index; |
7e64e059 CH |
432 | |
433 | /* Remove from our list. */ | |
434 | spin_lock_irqsave(&vcdev->lock, flags); | |
435 | list_del(&info->node); | |
436 | spin_unlock_irqrestore(&vcdev->lock, flags); | |
437 | ||
438 | /* Release from host. */ | |
d4674240 CH |
439 | if (vcdev->revision == 0) { |
440 | info->info_block->l.queue = 0; | |
441 | info->info_block->l.align = 0; | |
442 | info->info_block->l.index = index; | |
443 | info->info_block->l.num = 0; | |
444 | ccw->count = sizeof(info->info_block->l); | |
445 | } else { | |
446 | info->info_block->s.desc = 0; | |
447 | info->info_block->s.index = index; | |
448 | info->info_block->s.num = 0; | |
449 | info->info_block->s.avail = 0; | |
450 | info->info_block->s.used = 0; | |
451 | ccw->count = sizeof(info->info_block->s); | |
452 | } | |
73fa21ea CH |
453 | ccw->cmd_code = CCW_CMD_SET_VQ; |
454 | ccw->flags = 0; | |
73fa21ea CH |
455 | ccw->cda = (__u32)(unsigned long)(info->info_block); |
456 | ret = ccw_io_helper(vcdev, ccw, | |
457 | VIRTIO_CCW_DOING_SET_VQ | index); | |
7e64e059 CH |
458 | /* |
459 | * -ENODEV isn't considered an error: The device is gone anyway. | |
460 | * This may happen on device detach. | |
461 | */ | |
462 | if (ret && (ret != -ENODEV)) | |
99240622 | 463 | dev_warn(&vq->vdev->dev, "Error %d while deleting queue %d\n", |
7e64e059 CH |
464 | ret, index); |
465 | ||
466 | vring_del_virtqueue(vq); | |
48720ba5 HP |
467 | ccw_device_dma_free(vcdev->cdev, info->info_block, |
468 | sizeof(*info->info_block)); | |
7e64e059 CH |
469 | kfree(info); |
470 | } | |
471 | ||
472 | static void virtio_ccw_del_vqs(struct virtio_device *vdev) | |
473 | { | |
474 | struct virtqueue *vq, *n; | |
73fa21ea | 475 | struct ccw1 *ccw; |
96b14536 | 476 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); |
73fa21ea | 477 | |
48720ba5 | 478 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
73fa21ea CH |
479 | if (!ccw) |
480 | return; | |
481 | ||
96b14536 | 482 | virtio_ccw_drop_indicator(vcdev, ccw); |
7e64e059 CH |
483 | |
484 | list_for_each_entry_safe(vq, n, &vdev->vqs, list) | |
73fa21ea CH |
485 | virtio_ccw_del_vq(vq, ccw); |
486 | ||
48720ba5 | 487 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
7e64e059 CH |
488 | } |
489 | ||
490 | static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, | |
491 | int i, vq_callback_t *callback, | |
f94682dd | 492 | const char *name, bool ctx, |
73fa21ea | 493 | struct ccw1 *ccw) |
7e64e059 CH |
494 | { |
495 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
496 | int err; | |
c98d3683 | 497 | struct virtqueue *vq = NULL; |
7e64e059 | 498 | struct virtio_ccw_vq_info *info; |
3279beac | 499 | u64 queue; |
7e64e059 | 500 | unsigned long flags; |
3279beac | 501 | bool may_reduce; |
7e64e059 CH |
502 | |
503 | /* Allocate queue. */ | |
504 | info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL); | |
505 | if (!info) { | |
506 | dev_warn(&vcdev->cdev->dev, "no info\n"); | |
507 | err = -ENOMEM; | |
508 | goto out_err; | |
509 | } | |
48720ba5 HP |
510 | info->info_block = ccw_device_dma_zalloc(vcdev->cdev, |
511 | sizeof(*info->info_block)); | |
7e64e059 CH |
512 | if (!info->info_block) { |
513 | dev_warn(&vcdev->cdev->dev, "no info block\n"); | |
514 | err = -ENOMEM; | |
515 | goto out_err; | |
516 | } | |
73fa21ea | 517 | info->num = virtio_ccw_read_vq_conf(vcdev, ccw, i); |
ad2aa042 PM |
518 | if (info->num < 0) { |
519 | err = info->num; | |
520 | goto out_err; | |
521 | } | |
3279beac HP |
522 | may_reduce = vcdev->revision > 0; |
523 | vq = vring_create_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, | |
524 | vdev, true, may_reduce, ctx, | |
525 | virtio_ccw_kvm_notify, callback, name); | |
7e64e059 | 526 | |
7e64e059 CH |
527 | if (!vq) { |
528 | /* For now, we fail if we can't get the requested size. */ | |
529 | dev_warn(&vcdev->cdev->dev, "no vq\n"); | |
530 | err = -ENOMEM; | |
7e64e059 CH |
531 | goto out_err; |
532 | } | |
3279beac HP |
533 | /* it may have been reduced */ |
534 | info->num = virtqueue_get_vring_size(vq); | |
7e64e059 CH |
535 | |
536 | /* Register it with the host. */ | |
3279beac | 537 | queue = virtqueue_get_desc_addr(vq); |
d4674240 | 538 | if (vcdev->revision == 0) { |
3279beac | 539 | info->info_block->l.queue = queue; |
d4674240 CH |
540 | info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN; |
541 | info->info_block->l.index = i; | |
542 | info->info_block->l.num = info->num; | |
543 | ccw->count = sizeof(info->info_block->l); | |
544 | } else { | |
3279beac | 545 | info->info_block->s.desc = queue; |
d4674240 CH |
546 | info->info_block->s.index = i; |
547 | info->info_block->s.num = info->num; | |
f35f54f1 HP |
548 | info->info_block->s.avail = (__u64)virtqueue_get_avail_addr(vq); |
549 | info->info_block->s.used = (__u64)virtqueue_get_used_addr(vq); | |
d4674240 CH |
550 | ccw->count = sizeof(info->info_block->s); |
551 | } | |
73fa21ea CH |
552 | ccw->cmd_code = CCW_CMD_SET_VQ; |
553 | ccw->flags = 0; | |
73fa21ea CH |
554 | ccw->cda = (__u32)(unsigned long)(info->info_block); |
555 | err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i); | |
7e64e059 CH |
556 | if (err) { |
557 | dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n"); | |
7e64e059 CH |
558 | goto out_err; |
559 | } | |
560 | ||
c98d3683 CH |
561 | info->vq = vq; |
562 | vq->priv = info; | |
563 | ||
7e64e059 CH |
564 | /* Save it to our list. */ |
565 | spin_lock_irqsave(&vcdev->lock, flags); | |
566 | list_add(&info->node, &vcdev->virtqueues); | |
567 | spin_unlock_irqrestore(&vcdev->lock, flags); | |
568 | ||
569 | return vq; | |
570 | ||
571 | out_err: | |
c98d3683 CH |
572 | if (vq) |
573 | vring_del_virtqueue(vq); | |
574 | if (info) { | |
48720ba5 HP |
575 | ccw_device_dma_free(vcdev->cdev, info->info_block, |
576 | sizeof(*info->info_block)); | |
c98d3683 | 577 | } |
7e64e059 CH |
578 | kfree(info); |
579 | return ERR_PTR(err); | |
580 | } | |
581 | ||
96b14536 CH |
582 | static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev, |
583 | struct virtqueue *vqs[], int nvqs, | |
584 | struct ccw1 *ccw) | |
585 | { | |
586 | int ret; | |
587 | struct virtio_thinint_area *thinint_area = NULL; | |
588 | struct airq_info *info; | |
589 | ||
48720ba5 HP |
590 | thinint_area = ccw_device_dma_zalloc(vcdev->cdev, |
591 | sizeof(*thinint_area)); | |
96b14536 CH |
592 | if (!thinint_area) { |
593 | ret = -ENOMEM; | |
594 | goto out; | |
595 | } | |
596 | /* Try to get an indicator. */ | |
597 | thinint_area->indicator = get_airq_indicator(vqs, nvqs, | |
598 | &thinint_area->bit_nr, | |
599 | &vcdev->airq_info); | |
600 | if (!thinint_area->indicator) { | |
601 | ret = -ENOSPC; | |
602 | goto out; | |
603 | } | |
604 | info = vcdev->airq_info; | |
605 | thinint_area->summary_indicator = | |
39c7dcb1 | 606 | (unsigned long) get_summary_indicator(info); |
96b14536 CH |
607 | thinint_area->isc = VIRTIO_AIRQ_ISC; |
608 | ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER; | |
609 | ccw->flags = CCW_FLAG_SLI; | |
610 | ccw->count = sizeof(*thinint_area); | |
611 | ccw->cda = (__u32)(unsigned long)thinint_area; | |
612 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER); | |
613 | if (ret) { | |
614 | if (ret == -EOPNOTSUPP) { | |
615 | /* | |
616 | * The host does not support adapter interrupts | |
617 | * for virtio-ccw, stop trying. | |
618 | */ | |
619 | virtio_ccw_use_airq = 0; | |
620 | pr_info("Adapter interrupts unsupported on host\n"); | |
621 | } else | |
622 | dev_warn(&vcdev->cdev->dev, | |
623 | "enabling adapter interrupts = %d\n", ret); | |
624 | virtio_ccw_drop_indicators(vcdev); | |
625 | } | |
626 | out: | |
48720ba5 | 627 | ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area)); |
96b14536 CH |
628 | return ret; |
629 | } | |
630 | ||
7e64e059 CH |
631 | static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, |
632 | struct virtqueue *vqs[], | |
633 | vq_callback_t *callbacks[], | |
fb5e31d9 | 634 | const char * const names[], |
f94682dd | 635 | const bool *ctx, |
fb5e31d9 | 636 | struct irq_affinity *desc) |
7e64e059 CH |
637 | { |
638 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
639 | unsigned long *indicatorp = NULL; | |
a229989d | 640 | int ret, i, queue_idx = 0; |
73fa21ea CH |
641 | struct ccw1 *ccw; |
642 | ||
48720ba5 | 643 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
73fa21ea CH |
644 | if (!ccw) |
645 | return -ENOMEM; | |
7e64e059 CH |
646 | |
647 | for (i = 0; i < nvqs; ++i) { | |
a229989d WW |
648 | if (!names[i]) { |
649 | vqs[i] = NULL; | |
650 | continue; | |
651 | } | |
652 | ||
653 | vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, callbacks[i], | |
654 | names[i], ctx ? ctx[i] : false, | |
655 | ccw); | |
7e64e059 CH |
656 | if (IS_ERR(vqs[i])) { |
657 | ret = PTR_ERR(vqs[i]); | |
658 | vqs[i] = NULL; | |
659 | goto out; | |
660 | } | |
661 | } | |
662 | ret = -ENOMEM; | |
c235082b CH |
663 | /* |
664 | * We need a data area under 2G to communicate. Our payload is | |
665 | * the address of the indicators. | |
666 | */ | |
48720ba5 HP |
667 | indicatorp = ccw_device_dma_zalloc(vcdev->cdev, |
668 | sizeof(indicators(vcdev))); | |
7e64e059 CH |
669 | if (!indicatorp) |
670 | goto out; | |
22a4a639 | 671 | *indicatorp = (unsigned long) indicators(vcdev); |
96b14536 CH |
672 | if (vcdev->is_thinint) { |
673 | ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); | |
674 | if (ret) | |
675 | /* no error, just fall back to legacy interrupts */ | |
970ba6ac | 676 | vcdev->is_thinint = false; |
96b14536 CH |
677 | } |
678 | if (!vcdev->is_thinint) { | |
679 | /* Register queue indicators with host. */ | |
22a4a639 | 680 | *indicators(vcdev) = 0; |
96b14536 CH |
681 | ccw->cmd_code = CCW_CMD_SET_IND; |
682 | ccw->flags = 0; | |
22a4a639 | 683 | ccw->count = sizeof(indicators(vcdev)); |
96b14536 CH |
684 | ccw->cda = (__u32)(unsigned long) indicatorp; |
685 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); | |
686 | if (ret) | |
687 | goto out; | |
688 | } | |
7e64e059 | 689 | /* Register indicators2 with host for config changes */ |
22a4a639 HP |
690 | *indicatorp = (unsigned long) indicators2(vcdev); |
691 | *indicators2(vcdev) = 0; | |
73fa21ea CH |
692 | ccw->cmd_code = CCW_CMD_SET_CONF_IND; |
693 | ccw->flags = 0; | |
22a4a639 | 694 | ccw->count = sizeof(indicators2(vcdev)); |
73fa21ea CH |
695 | ccw->cda = (__u32)(unsigned long) indicatorp; |
696 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); | |
7e64e059 CH |
697 | if (ret) |
698 | goto out; | |
699 | ||
48720ba5 HP |
700 | if (indicatorp) |
701 | ccw_device_dma_free(vcdev->cdev, indicatorp, | |
702 | sizeof(indicators(vcdev))); | |
703 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); | |
7e64e059 CH |
704 | return 0; |
705 | out: | |
48720ba5 HP |
706 | if (indicatorp) |
707 | ccw_device_dma_free(vcdev->cdev, indicatorp, | |
708 | sizeof(indicators(vcdev))); | |
709 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); | |
7e64e059 CH |
710 | virtio_ccw_del_vqs(vdev); |
711 | return ret; | |
712 | } | |
713 | ||
714 | static void virtio_ccw_reset(struct virtio_device *vdev) | |
715 | { | |
716 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
73fa21ea CH |
717 | struct ccw1 *ccw; |
718 | ||
48720ba5 | 719 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
73fa21ea CH |
720 | if (!ccw) |
721 | return; | |
7e64e059 CH |
722 | |
723 | /* Zero status bits. */ | |
48720ba5 | 724 | vcdev->dma_area->status = 0; |
7e64e059 CH |
725 | |
726 | /* Send a reset ccw on device. */ | |
73fa21ea CH |
727 | ccw->cmd_code = CCW_CMD_VDEV_RESET; |
728 | ccw->flags = 0; | |
729 | ccw->count = 0; | |
730 | ccw->cda = 0; | |
731 | ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET); | |
48720ba5 | 732 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
7e64e059 CH |
733 | } |
734 | ||
d0254773 | 735 | static u64 virtio_ccw_get_features(struct virtio_device *vdev) |
7e64e059 CH |
736 | { |
737 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
73fa21ea | 738 | struct virtio_feature_desc *features; |
732c56e9 MT |
739 | int ret; |
740 | u64 rc; | |
73fa21ea | 741 | struct ccw1 *ccw; |
7e64e059 | 742 | |
48720ba5 | 743 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
73fa21ea CH |
744 | if (!ccw) |
745 | return 0; | |
746 | ||
48720ba5 | 747 | features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features)); |
73fa21ea CH |
748 | if (!features) { |
749 | rc = 0; | |
750 | goto out_free; | |
751 | } | |
7e64e059 | 752 | /* Read the feature bits from the host. */ |
73fa21ea CH |
753 | features->index = 0; |
754 | ccw->cmd_code = CCW_CMD_READ_FEAT; | |
755 | ccw->flags = 0; | |
756 | ccw->count = sizeof(*features); | |
757 | ccw->cda = (__u32)(unsigned long)features; | |
758 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); | |
759 | if (ret) { | |
760 | rc = 0; | |
761 | goto out_free; | |
762 | } | |
763 | ||
764 | rc = le32_to_cpu(features->features); | |
7e64e059 | 765 | |
ce15408f MT |
766 | if (vcdev->revision == 0) |
767 | goto out_free; | |
768 | ||
732c56e9 MT |
769 | /* Read second half of the feature bits from the host. */ |
770 | features->index = 1; | |
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 == 0) | |
777 | rc |= (u64)le32_to_cpu(features->features) << 32; | |
778 | ||
73fa21ea | 779 | out_free: |
48720ba5 HP |
780 | ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); |
781 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); | |
73fa21ea | 782 | return rc; |
7e64e059 CH |
783 | } |
784 | ||
3a814fdf TB |
785 | static void ccw_transport_features(struct virtio_device *vdev) |
786 | { | |
787 | /* | |
050f4c4d | 788 | * Currently nothing to do here. |
3a814fdf | 789 | */ |
3a814fdf TB |
790 | } |
791 | ||
5c609a5e | 792 | static int virtio_ccw_finalize_features(struct virtio_device *vdev) |
7e64e059 CH |
793 | { |
794 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
73fa21ea | 795 | struct virtio_feature_desc *features; |
73fa21ea | 796 | struct ccw1 *ccw; |
f01a2a81 | 797 | int ret; |
73fa21ea | 798 | |
f13d8bc2 | 799 | if (vcdev->revision >= 1 && |
4d23676f MT |
800 | !__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) { |
801 | dev_err(&vdev->dev, "virtio: device uses revision 1 " | |
802 | "but does not have VIRTIO_F_VERSION_1\n"); | |
803 | return -EINVAL; | |
804 | } | |
805 | ||
48720ba5 | 806 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
73fa21ea | 807 | if (!ccw) |
f01a2a81 | 808 | return -ENOMEM; |
73fa21ea | 809 | |
48720ba5 | 810 | features = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*features)); |
f01a2a81 CH |
811 | if (!features) { |
812 | ret = -ENOMEM; | |
73fa21ea | 813 | goto out_free; |
f01a2a81 | 814 | } |
7e64e059 CH |
815 | /* Give virtio_ring a chance to accept features. */ |
816 | vring_transport_features(vdev); | |
817 | ||
3a814fdf TB |
818 | /* Give virtio_ccw a chance to accept features. */ |
819 | ccw_transport_features(vdev); | |
820 | ||
e16e12be | 821 | features->index = 0; |
732c56e9 MT |
822 | features->features = cpu_to_le32((u32)vdev->features); |
823 | /* Write the first half of the feature bits to the host. */ | |
824 | ccw->cmd_code = CCW_CMD_WRITE_FEAT; | |
825 | ccw->flags = 0; | |
826 | ccw->count = sizeof(*features); | |
827 | ccw->cda = (__u32)(unsigned long)features; | |
f01a2a81 CH |
828 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); |
829 | if (ret) | |
830 | goto out_free; | |
732c56e9 | 831 | |
ce15408f MT |
832 | if (vcdev->revision == 0) |
833 | goto out_free; | |
834 | ||
732c56e9 MT |
835 | features->index = 1; |
836 | features->features = cpu_to_le32(vdev->features >> 32); | |
837 | /* Write the second half of the feature bits to the host. */ | |
e16e12be MT |
838 | ccw->cmd_code = CCW_CMD_WRITE_FEAT; |
839 | ccw->flags = 0; | |
840 | ccw->count = sizeof(*features); | |
841 | ccw->cda = (__u32)(unsigned long)features; | |
f01a2a81 | 842 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); |
e16e12be | 843 | |
73fa21ea | 844 | out_free: |
48720ba5 HP |
845 | ccw_device_dma_free(vcdev->cdev, features, sizeof(*features)); |
846 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); | |
5c609a5e | 847 | |
f01a2a81 | 848 | return ret; |
7e64e059 CH |
849 | } |
850 | ||
851 | static void virtio_ccw_get_config(struct virtio_device *vdev, | |
852 | unsigned int offset, void *buf, unsigned len) | |
853 | { | |
854 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
855 | int ret; | |
73fa21ea CH |
856 | struct ccw1 *ccw; |
857 | void *config_area; | |
2448a299 | 858 | unsigned long flags; |
73fa21ea | 859 | |
48720ba5 | 860 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
73fa21ea CH |
861 | if (!ccw) |
862 | return; | |
863 | ||
48720ba5 HP |
864 | config_area = ccw_device_dma_zalloc(vcdev->cdev, |
865 | VIRTIO_CCW_CONFIG_SIZE); | |
73fa21ea CH |
866 | if (!config_area) |
867 | goto out_free; | |
7e64e059 CH |
868 | |
869 | /* Read the config area from the host. */ | |
73fa21ea CH |
870 | ccw->cmd_code = CCW_CMD_READ_CONF; |
871 | ccw->flags = 0; | |
872 | ccw->count = offset + len; | |
873 | ccw->cda = (__u32)(unsigned long)config_area; | |
874 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG); | |
7e64e059 | 875 | if (ret) |
73fa21ea | 876 | goto out_free; |
7e64e059 | 877 | |
2448a299 | 878 | spin_lock_irqsave(&vcdev->lock, flags); |
431dae77 | 879 | memcpy(vcdev->config, config_area, offset + len); |
431dae77 CH |
880 | if (vcdev->config_ready < offset + len) |
881 | vcdev->config_ready = offset + len; | |
2448a299 HP |
882 | spin_unlock_irqrestore(&vcdev->lock, flags); |
883 | if (buf) | |
884 | memcpy(buf, config_area + offset, len); | |
73fa21ea CH |
885 | |
886 | out_free: | |
48720ba5 HP |
887 | ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); |
888 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); | |
7e64e059 CH |
889 | } |
890 | ||
891 | static void virtio_ccw_set_config(struct virtio_device *vdev, | |
892 | unsigned int offset, const void *buf, | |
893 | unsigned len) | |
894 | { | |
895 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
73fa21ea CH |
896 | struct ccw1 *ccw; |
897 | void *config_area; | |
2448a299 | 898 | unsigned long flags; |
73fa21ea | 899 | |
48720ba5 | 900 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
73fa21ea CH |
901 | if (!ccw) |
902 | return; | |
903 | ||
48720ba5 HP |
904 | config_area = ccw_device_dma_zalloc(vcdev->cdev, |
905 | VIRTIO_CCW_CONFIG_SIZE); | |
73fa21ea CH |
906 | if (!config_area) |
907 | goto out_free; | |
7e64e059 | 908 | |
431dae77 CH |
909 | /* Make sure we don't overwrite fields. */ |
910 | if (vcdev->config_ready < offset) | |
911 | virtio_ccw_get_config(vdev, 0, NULL, offset); | |
2448a299 | 912 | spin_lock_irqsave(&vcdev->lock, flags); |
7e64e059 CH |
913 | memcpy(&vcdev->config[offset], buf, len); |
914 | /* Write the config area to the host. */ | |
73fa21ea | 915 | memcpy(config_area, vcdev->config, sizeof(vcdev->config)); |
2448a299 | 916 | spin_unlock_irqrestore(&vcdev->lock, flags); |
73fa21ea CH |
917 | ccw->cmd_code = CCW_CMD_WRITE_CONF; |
918 | ccw->flags = 0; | |
919 | ccw->count = offset + len; | |
920 | ccw->cda = (__u32)(unsigned long)config_area; | |
921 | ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG); | |
922 | ||
923 | out_free: | |
48720ba5 HP |
924 | ccw_device_dma_free(vcdev->cdev, config_area, VIRTIO_CCW_CONFIG_SIZE); |
925 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); | |
7e64e059 CH |
926 | } |
927 | ||
928 | static u8 virtio_ccw_get_status(struct virtio_device *vdev) | |
929 | { | |
930 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
48720ba5 | 931 | u8 old_status = vcdev->dma_area->status; |
7d3ce5ab PM |
932 | struct ccw1 *ccw; |
933 | ||
182f709c | 934 | if (vcdev->revision < 2) |
48720ba5 | 935 | return vcdev->dma_area->status; |
7d3ce5ab | 936 | |
48720ba5 | 937 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
7d3ce5ab PM |
938 | if (!ccw) |
939 | return old_status; | |
940 | ||
941 | ccw->cmd_code = CCW_CMD_READ_STATUS; | |
942 | ccw->flags = 0; | |
48720ba5 HP |
943 | ccw->count = sizeof(vcdev->dma_area->status); |
944 | ccw->cda = (__u32)(unsigned long)&vcdev->dma_area->status; | |
7d3ce5ab PM |
945 | ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS); |
946 | /* | |
947 | * If the channel program failed (should only happen if the device | |
948 | * was hotunplugged, and then we clean up via the machine check | |
48720ba5 | 949 | * handler anyway), vcdev->dma_area->status was not overwritten and we just |
7d3ce5ab PM |
950 | * return the old status, which is fine. |
951 | */ | |
48720ba5 | 952 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
7e64e059 | 953 | |
48720ba5 | 954 | return vcdev->dma_area->status; |
7e64e059 CH |
955 | } |
956 | ||
957 | static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status) | |
958 | { | |
959 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
48720ba5 | 960 | u8 old_status = vcdev->dma_area->status; |
73fa21ea | 961 | struct ccw1 *ccw; |
48555136 | 962 | int ret; |
73fa21ea | 963 | |
48720ba5 | 964 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
73fa21ea CH |
965 | if (!ccw) |
966 | return; | |
7e64e059 CH |
967 | |
968 | /* Write the status to the host. */ | |
48720ba5 | 969 | vcdev->dma_area->status = status; |
73fa21ea CH |
970 | ccw->cmd_code = CCW_CMD_WRITE_STATUS; |
971 | ccw->flags = 0; | |
972 | ccw->count = sizeof(status); | |
48720ba5 | 973 | ccw->cda = (__u32)(unsigned long)&vcdev->dma_area->status; |
8b4ec69d JW |
974 | /* We use ssch for setting the status which is a serializing |
975 | * instruction that guarantees the memory writes have | |
976 | * completed before ssch. | |
977 | */ | |
48555136 MT |
978 | ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_STATUS); |
979 | /* Write failed? We assume status is unchanged. */ | |
980 | if (ret) | |
48720ba5 HP |
981 | vcdev->dma_area->status = old_status; |
982 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); | |
7e64e059 CH |
983 | } |
984 | ||
971bedca CH |
985 | static const char *virtio_ccw_bus_name(struct virtio_device *vdev) |
986 | { | |
987 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
988 | ||
989 | return dev_name(&vcdev->cdev->dev); | |
990 | } | |
991 | ||
3a232277 JW |
992 | static void virtio_ccw_synchronize_cbs(struct virtio_device *vdev) |
993 | { | |
994 | struct virtio_ccw_device *vcdev = to_vc_device(vdev); | |
995 | struct airq_info *info = vcdev->airq_info; | |
996 | ||
997 | if (info) { | |
998 | /* | |
999 | * This device uses adapter interrupts: synchronize with | |
1000 | * vring_interrupt() called by virtio_airq_handler() | |
1001 | * via the indicator area lock. | |
1002 | */ | |
1003 | write_lock_irq(&info->lock); | |
1004 | write_unlock_irq(&info->lock); | |
1005 | } else { | |
1006 | /* This device uses classic interrupts: synchronize | |
1007 | * with vring_interrupt() called by | |
1008 | * virtio_ccw_int_handler() via the per-device | |
1009 | * irq_lock | |
1010 | */ | |
1011 | write_lock_irq(&vcdev->irq_lock); | |
1012 | write_unlock_irq(&vcdev->irq_lock); | |
1013 | } | |
1014 | } | |
1015 | ||
0db1dba5 | 1016 | static const struct virtio_config_ops virtio_ccw_config_ops = { |
7e64e059 CH |
1017 | .get_features = virtio_ccw_get_features, |
1018 | .finalize_features = virtio_ccw_finalize_features, | |
1019 | .get = virtio_ccw_get_config, | |
1020 | .set = virtio_ccw_set_config, | |
1021 | .get_status = virtio_ccw_get_status, | |
1022 | .set_status = virtio_ccw_set_status, | |
1023 | .reset = virtio_ccw_reset, | |
1024 | .find_vqs = virtio_ccw_find_vqs, | |
1025 | .del_vqs = virtio_ccw_del_vqs, | |
971bedca | 1026 | .bus_name = virtio_ccw_bus_name, |
3a232277 | 1027 | .synchronize_cbs = virtio_ccw_synchronize_cbs, |
7e64e059 CH |
1028 | }; |
1029 | ||
1030 | ||
1031 | /* | |
1032 | * ccw bus driver related functions | |
1033 | */ | |
1034 | ||
1035 | static void virtio_ccw_release_dev(struct device *_d) | |
1036 | { | |
15e90f52 | 1037 | struct virtio_device *dev = dev_to_virtio(_d); |
7e64e059 CH |
1038 | struct virtio_ccw_device *vcdev = to_vc_device(dev); |
1039 | ||
48720ba5 HP |
1040 | ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, |
1041 | sizeof(*vcdev->dma_area)); | |
7e64e059 CH |
1042 | kfree(vcdev); |
1043 | } | |
1044 | ||
1045 | static int irb_is_error(struct irb *irb) | |
1046 | { | |
1047 | if (scsw_cstat(&irb->scsw) != 0) | |
1048 | return 1; | |
1049 | if (scsw_dstat(&irb->scsw) & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) | |
1050 | return 1; | |
1051 | if (scsw_cc(&irb->scsw) != 0) | |
1052 | return 1; | |
1053 | return 0; | |
1054 | } | |
1055 | ||
1056 | static struct virtqueue *virtio_ccw_vq_by_ind(struct virtio_ccw_device *vcdev, | |
1057 | int index) | |
1058 | { | |
1059 | struct virtio_ccw_vq_info *info; | |
1060 | unsigned long flags; | |
1061 | struct virtqueue *vq; | |
1062 | ||
1063 | vq = NULL; | |
1064 | spin_lock_irqsave(&vcdev->lock, flags); | |
1065 | list_for_each_entry(info, &vcdev->virtqueues, node) { | |
9d0ca6ed | 1066 | if (info->vq->index == index) { |
7e64e059 CH |
1067 | vq = info->vq; |
1068 | break; | |
1069 | } | |
1070 | } | |
1071 | spin_unlock_irqrestore(&vcdev->lock, flags); | |
1072 | return vq; | |
1073 | } | |
1074 | ||
74a599f0 CH |
1075 | static void virtio_ccw_check_activity(struct virtio_ccw_device *vcdev, |
1076 | __u32 activity) | |
1077 | { | |
1078 | if (vcdev->curr_io & activity) { | |
1079 | switch (activity) { | |
1080 | case VIRTIO_CCW_DOING_READ_FEAT: | |
1081 | case VIRTIO_CCW_DOING_WRITE_FEAT: | |
1082 | case VIRTIO_CCW_DOING_READ_CONFIG: | |
1083 | case VIRTIO_CCW_DOING_WRITE_CONFIG: | |
1084 | case VIRTIO_CCW_DOING_WRITE_STATUS: | |
7d3ce5ab | 1085 | case VIRTIO_CCW_DOING_READ_STATUS: |
74a599f0 CH |
1086 | case VIRTIO_CCW_DOING_SET_VQ: |
1087 | case VIRTIO_CCW_DOING_SET_IND: | |
1088 | case VIRTIO_CCW_DOING_SET_CONF_IND: | |
1089 | case VIRTIO_CCW_DOING_RESET: | |
1090 | case VIRTIO_CCW_DOING_READ_VQ_CONF: | |
1091 | case VIRTIO_CCW_DOING_SET_IND_ADAPTER: | |
1092 | case VIRTIO_CCW_DOING_SET_VIRTIO_REV: | |
1093 | vcdev->curr_io &= ~activity; | |
1094 | wake_up(&vcdev->wait_q); | |
1095 | break; | |
1096 | default: | |
1097 | /* don't know what to do... */ | |
1098 | dev_warn(&vcdev->cdev->dev, | |
1099 | "Suspicious activity '%08x'\n", activity); | |
1100 | WARN_ON(1); | |
1101 | break; | |
1102 | } | |
1103 | } | |
1104 | } | |
1105 | ||
7e64e059 CH |
1106 | static void virtio_ccw_int_handler(struct ccw_device *cdev, |
1107 | unsigned long intparm, | |
1108 | struct irb *irb) | |
1109 | { | |
1110 | __u32 activity = intparm & VIRTIO_CCW_INTPARM_MASK; | |
1111 | struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); | |
1112 | int i; | |
1113 | struct virtqueue *vq; | |
7e64e059 | 1114 | |
2e021043 HG |
1115 | if (!vcdev) |
1116 | return; | |
74a599f0 CH |
1117 | if (IS_ERR(irb)) { |
1118 | vcdev->err = PTR_ERR(irb); | |
1119 | virtio_ccw_check_activity(vcdev, activity); | |
1120 | /* Don't poke around indicators, something's wrong. */ | |
1121 | return; | |
1122 | } | |
7e64e059 CH |
1123 | /* Check if it's a notification from the host. */ |
1124 | if ((intparm == 0) && | |
1125 | (scsw_stctl(&irb->scsw) == | |
1126 | (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) { | |
1127 | /* OK */ | |
1128 | } | |
19e4735b CH |
1129 | if (irb_is_error(irb)) { |
1130 | /* Command reject? */ | |
1131 | if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) && | |
1132 | (irb->ecw[0] & SNS0_CMD_REJECT)) | |
1133 | vcdev->err = -EOPNOTSUPP; | |
1134 | else | |
1135 | /* Map everything else to -EIO. */ | |
1136 | vcdev->err = -EIO; | |
1137 | } | |
74a599f0 | 1138 | virtio_ccw_check_activity(vcdev, activity); |
c346dae4 JW |
1139 | #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION |
1140 | /* | |
1141 | * Paired with virtio_ccw_synchronize_cbs() and interrupts are | |
1142 | * disabled here. | |
1143 | */ | |
3a232277 | 1144 | read_lock(&vcdev->irq_lock); |
c346dae4 | 1145 | #endif |
22a4a639 HP |
1146 | for_each_set_bit(i, indicators(vcdev), |
1147 | sizeof(*indicators(vcdev)) * BITS_PER_BYTE) { | |
7e64e059 | 1148 | /* The bit clear must happen before the vring kick. */ |
22a4a639 | 1149 | clear_bit(i, indicators(vcdev)); |
7e64e059 CH |
1150 | barrier(); |
1151 | vq = virtio_ccw_vq_by_ind(vcdev, i); | |
1152 | vring_interrupt(0, vq); | |
1153 | } | |
c346dae4 | 1154 | #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION |
3a232277 | 1155 | read_unlock(&vcdev->irq_lock); |
c346dae4 | 1156 | #endif |
22a4a639 | 1157 | if (test_bit(0, indicators2(vcdev))) { |
016c98c6 | 1158 | virtio_config_changed(&vcdev->vdev); |
22a4a639 | 1159 | clear_bit(0, indicators2(vcdev)); |
7e64e059 CH |
1160 | } |
1161 | } | |
1162 | ||
1163 | /* | |
1164 | * We usually want to autoonline all devices, but give the admin | |
1165 | * a way to exempt devices from this. | |
1166 | */ | |
1167 | #define __DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \ | |
1168 | (8*sizeof(long))) | |
1169 | static unsigned long devs_no_auto[__MAX_SSID + 1][__DEV_WORDS]; | |
1170 | ||
1171 | static char *no_auto = ""; | |
1172 | ||
1173 | module_param(no_auto, charp, 0444); | |
1174 | MODULE_PARM_DESC(no_auto, "list of ccw bus id ranges not to be auto-onlined"); | |
1175 | ||
1176 | static int virtio_ccw_check_autoonline(struct ccw_device *cdev) | |
1177 | { | |
1178 | struct ccw_dev_id id; | |
1179 | ||
1180 | ccw_device_get_id(cdev, &id); | |
1181 | if (test_bit(id.devno, devs_no_auto[id.ssid])) | |
1182 | return 0; | |
1183 | return 1; | |
1184 | } | |
1185 | ||
1186 | static void virtio_ccw_auto_online(void *data, async_cookie_t cookie) | |
1187 | { | |
1188 | struct ccw_device *cdev = data; | |
1189 | int ret; | |
1190 | ||
1191 | ret = ccw_device_set_online(cdev); | |
1192 | if (ret) | |
1193 | dev_warn(&cdev->dev, "Failed to set online: %d\n", ret); | |
1194 | } | |
1195 | ||
1196 | static int virtio_ccw_probe(struct ccw_device *cdev) | |
1197 | { | |
1198 | cdev->handler = virtio_ccw_int_handler; | |
1199 | ||
1200 | if (virtio_ccw_check_autoonline(cdev)) | |
1201 | async_schedule(virtio_ccw_auto_online, cdev); | |
1202 | return 0; | |
1203 | } | |
1204 | ||
2e021043 HG |
1205 | static struct virtio_ccw_device *virtio_grab_drvdata(struct ccw_device *cdev) |
1206 | { | |
1207 | unsigned long flags; | |
1208 | struct virtio_ccw_device *vcdev; | |
1209 | ||
1210 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1211 | vcdev = dev_get_drvdata(&cdev->dev); | |
79629b20 | 1212 | if (!vcdev || vcdev->going_away) { |
2e021043 HG |
1213 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
1214 | return NULL; | |
1215 | } | |
79629b20 | 1216 | vcdev->going_away = true; |
2e021043 HG |
1217 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
1218 | return vcdev; | |
1219 | } | |
1220 | ||
7e64e059 CH |
1221 | static void virtio_ccw_remove(struct ccw_device *cdev) |
1222 | { | |
79629b20 | 1223 | unsigned long flags; |
2e021043 | 1224 | struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); |
7e64e059 | 1225 | |
e75279c4 HG |
1226 | if (vcdev && cdev->online) { |
1227 | if (vcdev->device_lost) | |
1228 | virtio_break_device(&vcdev->vdev); | |
7e64e059 | 1229 | unregister_virtio_device(&vcdev->vdev); |
e75279c4 HG |
1230 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
1231 | dev_set_drvdata(&cdev->dev, NULL); | |
1232 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1233 | } | |
7e64e059 CH |
1234 | cdev->handler = NULL; |
1235 | } | |
1236 | ||
1237 | static int virtio_ccw_offline(struct ccw_device *cdev) | |
1238 | { | |
79629b20 | 1239 | unsigned long flags; |
2e021043 | 1240 | struct virtio_ccw_device *vcdev = virtio_grab_drvdata(cdev); |
7e64e059 | 1241 | |
e75279c4 HG |
1242 | if (!vcdev) |
1243 | return 0; | |
1244 | if (vcdev->device_lost) | |
1245 | virtio_break_device(&vcdev->vdev); | |
1246 | unregister_virtio_device(&vcdev->vdev); | |
1247 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
1248 | dev_set_drvdata(&cdev->dev, NULL); | |
1249 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
7e64e059 CH |
1250 | return 0; |
1251 | } | |
1252 | ||
6bb2c835 TH |
1253 | static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev) |
1254 | { | |
1255 | struct virtio_rev_info *rev; | |
1256 | struct ccw1 *ccw; | |
1257 | int ret; | |
1258 | ||
48720ba5 | 1259 | ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw)); |
6bb2c835 TH |
1260 | if (!ccw) |
1261 | return -ENOMEM; | |
48720ba5 | 1262 | rev = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*rev)); |
6bb2c835 | 1263 | if (!rev) { |
48720ba5 | 1264 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
6bb2c835 TH |
1265 | return -ENOMEM; |
1266 | } | |
1267 | ||
1268 | /* Set transport revision */ | |
1269 | ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV; | |
1270 | ccw->flags = 0; | |
1271 | ccw->count = sizeof(*rev); | |
1272 | ccw->cda = (__u32)(unsigned long)rev; | |
1273 | ||
1274 | vcdev->revision = VIRTIO_CCW_REV_MAX; | |
1275 | do { | |
1276 | rev->revision = vcdev->revision; | |
1277 | /* none of our supported revisions carry payload */ | |
1278 | rev->length = 0; | |
1279 | ret = ccw_io_helper(vcdev, ccw, | |
1280 | VIRTIO_CCW_DOING_SET_VIRTIO_REV); | |
1281 | if (ret == -EOPNOTSUPP) { | |
1282 | if (vcdev->revision == 0) | |
1283 | /* | |
1284 | * The host device does not support setting | |
1285 | * the revision: let's operate it in legacy | |
1286 | * mode. | |
1287 | */ | |
1288 | ret = 0; | |
1289 | else | |
1290 | vcdev->revision--; | |
1291 | } | |
1292 | } while (ret == -EOPNOTSUPP); | |
1293 | ||
48720ba5 HP |
1294 | ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw)); |
1295 | ccw_device_dma_free(vcdev->cdev, rev, sizeof(*rev)); | |
6bb2c835 TH |
1296 | return ret; |
1297 | } | |
7e64e059 | 1298 | |
7e64e059 CH |
1299 | static int virtio_ccw_online(struct ccw_device *cdev) |
1300 | { | |
1301 | int ret; | |
1302 | struct virtio_ccw_device *vcdev; | |
2e021043 | 1303 | unsigned long flags; |
7e64e059 CH |
1304 | |
1305 | vcdev = kzalloc(sizeof(*vcdev), GFP_KERNEL); | |
1306 | if (!vcdev) { | |
1307 | dev_warn(&cdev->dev, "Could not get memory for virtio\n"); | |
1308 | ret = -ENOMEM; | |
1309 | goto out_free; | |
1310 | } | |
f35f54f1 | 1311 | vcdev->vdev.dev.parent = &cdev->dev; |
48720ba5 HP |
1312 | vcdev->cdev = cdev; |
1313 | vcdev->dma_area = ccw_device_dma_zalloc(vcdev->cdev, | |
1314 | sizeof(*vcdev->dma_area)); | |
1315 | if (!vcdev->dma_area) { | |
7e64e059 CH |
1316 | ret = -ENOMEM; |
1317 | goto out_free; | |
1318 | } | |
1319 | ||
96b14536 CH |
1320 | vcdev->is_thinint = virtio_ccw_use_airq; /* at least try */ |
1321 | ||
7e64e059 CH |
1322 | vcdev->vdev.dev.release = virtio_ccw_release_dev; |
1323 | vcdev->vdev.config = &virtio_ccw_config_ops; | |
7e64e059 CH |
1324 | init_waitqueue_head(&vcdev->wait_q); |
1325 | INIT_LIST_HEAD(&vcdev->virtqueues); | |
1326 | spin_lock_init(&vcdev->lock); | |
3a232277 | 1327 | rwlock_init(&vcdev->irq_lock); |
78b1a52e | 1328 | mutex_init(&vcdev->io_lock); |
7e64e059 | 1329 | |
2e021043 | 1330 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
7e64e059 | 1331 | dev_set_drvdata(&cdev->dev, vcdev); |
2e021043 | 1332 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
7e64e059 CH |
1333 | vcdev->vdev.id.vendor = cdev->id.cu_type; |
1334 | vcdev->vdev.id.device = cdev->id.cu_model; | |
6bb2c835 | 1335 | |
2003a7a5 MT |
1336 | ret = virtio_ccw_set_transport_rev(vcdev); |
1337 | if (ret) | |
1338 | goto out_free; | |
6bb2c835 | 1339 | |
7e64e059 CH |
1340 | ret = register_virtio_device(&vcdev->vdev); |
1341 | if (ret) { | |
1342 | dev_warn(&cdev->dev, "Failed to register virtio device: %d\n", | |
1343 | ret); | |
1344 | goto out_put; | |
1345 | } | |
1346 | return 0; | |
1347 | out_put: | |
2e021043 | 1348 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
7e64e059 | 1349 | dev_set_drvdata(&cdev->dev, NULL); |
2e021043 | 1350 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
7e64e059 CH |
1351 | put_device(&vcdev->vdev.dev); |
1352 | return ret; | |
1353 | out_free: | |
1354 | if (vcdev) { | |
48720ba5 HP |
1355 | ccw_device_dma_free(vcdev->cdev, vcdev->dma_area, |
1356 | sizeof(*vcdev->dma_area)); | |
7e64e059 CH |
1357 | } |
1358 | kfree(vcdev); | |
1359 | return ret; | |
1360 | } | |
1361 | ||
1362 | static int virtio_ccw_cio_notify(struct ccw_device *cdev, int event) | |
1363 | { | |
e75279c4 HG |
1364 | int rc; |
1365 | struct virtio_ccw_device *vcdev = dev_get_drvdata(&cdev->dev); | |
1366 | ||
1367 | /* | |
1368 | * Make sure vcdev is set | |
1369 | * i.e. set_offline/remove callback not already running | |
1370 | */ | |
1371 | if (!vcdev) | |
1372 | return NOTIFY_DONE; | |
1373 | ||
1374 | switch (event) { | |
1375 | case CIO_GONE: | |
1376 | vcdev->device_lost = true; | |
1377 | rc = NOTIFY_DONE; | |
1378 | break; | |
fa08a3b4 CB |
1379 | case CIO_OPER: |
1380 | rc = NOTIFY_OK; | |
1381 | break; | |
e75279c4 HG |
1382 | default: |
1383 | rc = NOTIFY_DONE; | |
1384 | break; | |
1385 | } | |
1386 | return rc; | |
7e64e059 CH |
1387 | } |
1388 | ||
1389 | static struct ccw_device_id virtio_ids[] = { | |
1390 | { CCW_DEVICE(0x3832, 0) }, | |
1391 | {}, | |
1392 | }; | |
7e64e059 CH |
1393 | |
1394 | static struct ccw_driver virtio_ccw_driver = { | |
1395 | .driver = { | |
1396 | .owner = THIS_MODULE, | |
1397 | .name = "virtio_ccw", | |
1398 | }, | |
1399 | .ids = virtio_ids, | |
1400 | .probe = virtio_ccw_probe, | |
1401 | .remove = virtio_ccw_remove, | |
1402 | .set_offline = virtio_ccw_offline, | |
1403 | .set_online = virtio_ccw_online, | |
1404 | .notify = virtio_ccw_cio_notify, | |
89f88337 | 1405 | .int_class = IRQIO_VIR, |
7e64e059 CH |
1406 | }; |
1407 | ||
1408 | static int __init pure_hex(char **cp, unsigned int *val, int min_digit, | |
1409 | int max_digit, int max_val) | |
1410 | { | |
1411 | int diff; | |
1412 | ||
1413 | diff = 0; | |
1414 | *val = 0; | |
1415 | ||
1416 | while (diff <= max_digit) { | |
1417 | int value = hex_to_bin(**cp); | |
1418 | ||
1419 | if (value < 0) | |
1420 | break; | |
1421 | *val = *val * 16 + value; | |
1422 | (*cp)++; | |
1423 | diff++; | |
1424 | } | |
1425 | ||
1426 | if ((diff < min_digit) || (diff > max_digit) || (*val > max_val)) | |
1427 | return 1; | |
1428 | ||
1429 | return 0; | |
1430 | } | |
1431 | ||
1432 | static int __init parse_busid(char *str, unsigned int *cssid, | |
1433 | unsigned int *ssid, unsigned int *devno) | |
1434 | { | |
1435 | char *str_work; | |
1436 | int rc, ret; | |
1437 | ||
1438 | rc = 1; | |
1439 | ||
1440 | if (*str == '\0') | |
1441 | goto out; | |
1442 | ||
1443 | str_work = str; | |
1444 | ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID); | |
1445 | if (ret || (str_work[0] != '.')) | |
1446 | goto out; | |
1447 | str_work++; | |
1448 | ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID); | |
1449 | if (ret || (str_work[0] != '.')) | |
1450 | goto out; | |
1451 | str_work++; | |
1452 | ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL); | |
1453 | if (ret || (str_work[0] != '\0')) | |
1454 | goto out; | |
1455 | ||
1456 | rc = 0; | |
1457 | out: | |
1458 | return rc; | |
1459 | } | |
1460 | ||
1461 | static void __init no_auto_parse(void) | |
1462 | { | |
1463 | unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to; | |
1464 | char *parm, *str; | |
1465 | int rc; | |
1466 | ||
1467 | str = no_auto; | |
1468 | while ((parm = strsep(&str, ","))) { | |
1469 | rc = parse_busid(strsep(&parm, "-"), &from_cssid, | |
1470 | &from_ssid, &from); | |
1471 | if (rc) | |
1472 | continue; | |
1473 | if (parm != NULL) { | |
1474 | rc = parse_busid(parm, &to_cssid, | |
1475 | &to_ssid, &to); | |
1476 | if ((from_ssid > to_ssid) || | |
1477 | ((from_ssid == to_ssid) && (from > to))) | |
1478 | rc = -EINVAL; | |
1479 | } else { | |
1480 | to_cssid = from_cssid; | |
1481 | to_ssid = from_ssid; | |
1482 | to = from; | |
1483 | } | |
1484 | if (rc) | |
1485 | continue; | |
1486 | while ((from_ssid < to_ssid) || | |
1487 | ((from_ssid == to_ssid) && (from <= to))) { | |
1488 | set_bit(from, devs_no_auto[from_ssid]); | |
1489 | from++; | |
1490 | if (from > __MAX_SUBCHANNEL) { | |
1491 | from_ssid++; | |
1492 | from = 0; | |
1493 | } | |
1494 | } | |
1495 | } | |
1496 | } | |
1497 | ||
1498 | static int __init virtio_ccw_init(void) | |
1499 | { | |
39c7dcb1 HP |
1500 | int rc; |
1501 | ||
7e64e059 CH |
1502 | /* parse no_auto string before we do anything further */ |
1503 | no_auto_parse(); | |
39c7dcb1 HP |
1504 | |
1505 | summary_indicators = cio_dma_zalloc(MAX_AIRQ_AREAS); | |
1506 | if (!summary_indicators) | |
1507 | return -ENOMEM; | |
1508 | rc = ccw_driver_register(&virtio_ccw_driver); | |
1509 | if (rc) | |
1510 | cio_dma_free(summary_indicators, MAX_AIRQ_AREAS); | |
1511 | return rc; | |
7e64e059 | 1512 | } |
acc50ec7 | 1513 | device_initcall(virtio_ccw_init); |