Commit | Line | Data |
---|---|---|
667ef3c3 DM |
1 | /* sunvdc.c: Sun LDOM Virtual Disk Client. |
2 | * | |
3d452e55 | 3 | * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net> |
667ef3c3 DM |
4 | */ |
5 | ||
6 | #include <linux/module.h> | |
7 | #include <linux/kernel.h> | |
8 | #include <linux/types.h> | |
9 | #include <linux/blkdev.h> | |
10 | #include <linux/hdreg.h> | |
11 | #include <linux/genhd.h> | |
9bce2182 | 12 | #include <linux/cdrom.h> |
667ef3c3 DM |
13 | #include <linux/slab.h> |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/completion.h> | |
16 | #include <linux/delay.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/list.h> | |
d91c5e88 | 19 | #include <linux/scatterlist.h> |
667ef3c3 DM |
20 | |
21 | #include <asm/vio.h> | |
22 | #include <asm/ldc.h> | |
23 | ||
24 | #define DRV_MODULE_NAME "sunvdc" | |
25 | #define PFX DRV_MODULE_NAME ": " | |
76e74bbe DE |
26 | #define DRV_MODULE_VERSION "1.2" |
27 | #define DRV_MODULE_RELDATE "November 24, 2014" | |
667ef3c3 | 28 | |
8d85fce7 | 29 | static char version[] = |
667ef3c3 DM |
30 | DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; |
31 | MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); | |
32 | MODULE_DESCRIPTION("Sun LDOM virtual disk client driver"); | |
33 | MODULE_LICENSE("GPL"); | |
34 | MODULE_VERSION(DRV_MODULE_VERSION); | |
35 | ||
d0aedcd4 | 36 | #define VDC_TX_RING_SIZE 512 |
f41e5461 | 37 | #define VDC_DEFAULT_BLK_SIZE 512 |
667ef3c3 DM |
38 | |
39 | #define WAITING_FOR_LINK_UP 0x01 | |
40 | #define WAITING_FOR_TX_SPACE 0x02 | |
41 | #define WAITING_FOR_GEN_CMD 0x04 | |
42 | #define WAITING_FOR_ANY -1 | |
43 | ||
76e74bbe DE |
44 | static struct workqueue_struct *sunvdc_wq; |
45 | ||
667ef3c3 DM |
46 | struct vdc_req_entry { |
47 | struct request *req; | |
48 | }; | |
49 | ||
50 | struct vdc_port { | |
51 | struct vio_driver_state vio; | |
52 | ||
667ef3c3 DM |
53 | struct gendisk *disk; |
54 | ||
55 | struct vdc_completion *cmp; | |
56 | ||
57 | u64 req_id; | |
58 | u64 seq; | |
59 | struct vdc_req_entry rq_arr[VDC_TX_RING_SIZE]; | |
60 | ||
61 | unsigned long ring_cookies; | |
62 | ||
63 | u64 max_xfer_size; | |
64 | u32 vdisk_block_size; | |
65 | ||
76e74bbe DE |
66 | u64 ldc_timeout; |
67 | struct timer_list ldc_reset_timer; | |
68 | struct work_struct ldc_reset_work; | |
69 | ||
667ef3c3 DM |
70 | /* The server fills these in for us in the disk attribute |
71 | * ACK packet. | |
72 | */ | |
73 | u64 operations; | |
74 | u32 vdisk_size; | |
75 | u8 vdisk_type; | |
9bce2182 | 76 | u8 vdisk_mtype; |
f41e5461 | 77 | u32 vdisk_phys_blksz; |
667ef3c3 DM |
78 | |
79 | char disk_name[32]; | |
667ef3c3 DM |
80 | }; |
81 | ||
76e74bbe DE |
82 | static void vdc_ldc_reset(struct vdc_port *port); |
83 | static void vdc_ldc_reset_work(struct work_struct *work); | |
e99e88a9 | 84 | static void vdc_ldc_reset_timer(struct timer_list *t); |
76e74bbe | 85 | |
667ef3c3 DM |
86 | static inline struct vdc_port *to_vdc_port(struct vio_driver_state *vio) |
87 | { | |
88 | return container_of(vio, struct vdc_port, vio); | |
89 | } | |
90 | ||
667ef3c3 DM |
91 | /* Ordered from largest major to lowest */ |
92 | static struct vio_version vdc_versions[] = { | |
f41e5461 | 93 | { .major = 1, .minor = 2 }, |
9bce2182 | 94 | { .major = 1, .minor = 1 }, |
667ef3c3 DM |
95 | { .major = 1, .minor = 0 }, |
96 | }; | |
97 | ||
9bce2182 AP |
98 | static inline int vdc_version_supported(struct vdc_port *port, |
99 | u16 major, u16 minor) | |
100 | { | |
101 | return port->vio.ver.major == major && port->vio.ver.minor >= minor; | |
102 | } | |
103 | ||
667ef3c3 DM |
104 | #define VDCBLK_NAME "vdisk" |
105 | static int vdc_major; | |
106 | #define PARTITION_SHIFT 3 | |
107 | ||
108 | static inline u32 vdc_tx_dring_avail(struct vio_dring_state *dr) | |
109 | { | |
110 | return vio_dring_avail(dr, VDC_TX_RING_SIZE); | |
111 | } | |
112 | ||
113 | static int vdc_getgeo(struct block_device *bdev, struct hd_geometry *geo) | |
114 | { | |
115 | struct gendisk *disk = bdev->bd_disk; | |
de5b73f0 AP |
116 | sector_t nsect = get_capacity(disk); |
117 | sector_t cylinders = nsect; | |
667ef3c3 | 118 | |
de5b73f0 AP |
119 | geo->heads = 0xff; |
120 | geo->sectors = 0x3f; | |
121 | sector_div(cylinders, geo->heads * geo->sectors); | |
122 | geo->cylinders = cylinders; | |
123 | if ((sector_t)(geo->cylinders + 1) * geo->heads * geo->sectors < nsect) | |
124 | geo->cylinders = 0xffff; | |
667ef3c3 DM |
125 | |
126 | return 0; | |
127 | } | |
128 | ||
9bce2182 AP |
129 | /* Add ioctl/CDROM_GET_CAPABILITY to support cdrom_id in udev |
130 | * when vdisk_mtype is VD_MEDIA_TYPE_CD or VD_MEDIA_TYPE_DVD. | |
131 | * Needed to be able to install inside an ldom from an iso image. | |
132 | */ | |
133 | static int vdc_ioctl(struct block_device *bdev, fmode_t mode, | |
134 | unsigned command, unsigned long argument) | |
135 | { | |
136 | int i; | |
137 | struct gendisk *disk; | |
138 | ||
139 | switch (command) { | |
140 | case CDROMMULTISESSION: | |
141 | pr_debug(PFX "Multisession CDs not supported\n"); | |
142 | for (i = 0; i < sizeof(struct cdrom_multisession); i++) | |
143 | if (put_user(0, (char __user *)(argument + i))) | |
144 | return -EFAULT; | |
145 | return 0; | |
146 | ||
147 | case CDROM_GET_CAPABILITY: | |
148 | disk = bdev->bd_disk; | |
149 | ||
150 | if (bdev->bd_disk && (disk->flags & GENHD_FL_CD)) | |
151 | return 0; | |
152 | return -EINVAL; | |
153 | ||
154 | default: | |
155 | pr_debug(PFX "ioctl %08x not supported\n", command); | |
156 | return -EINVAL; | |
157 | } | |
158 | } | |
159 | ||
83d5cde4 | 160 | static const struct block_device_operations vdc_fops = { |
667ef3c3 DM |
161 | .owner = THIS_MODULE, |
162 | .getgeo = vdc_getgeo, | |
9bce2182 | 163 | .ioctl = vdc_ioctl, |
667ef3c3 DM |
164 | }; |
165 | ||
76e74bbe DE |
166 | static void vdc_blk_queue_start(struct vdc_port *port) |
167 | { | |
168 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
169 | ||
170 | /* restart blk queue when ring is half emptied. also called after | |
171 | * handshake completes, so check for initial handshake before we've | |
172 | * allocated a disk. | |
173 | */ | |
174 | if (port->disk && blk_queue_stopped(port->disk->queue) && | |
175 | vdc_tx_dring_avail(dr) * 100 / VDC_TX_RING_SIZE >= 50) { | |
176 | blk_start_queue(port->disk->queue); | |
177 | } | |
178 | ||
179 | } | |
180 | ||
667ef3c3 DM |
181 | static void vdc_finish(struct vio_driver_state *vio, int err, int waiting_for) |
182 | { | |
183 | if (vio->cmp && | |
184 | (waiting_for == -1 || | |
185 | vio->cmp->waiting_for == waiting_for)) { | |
186 | vio->cmp->err = err; | |
187 | complete(&vio->cmp->com); | |
188 | vio->cmp = NULL; | |
189 | } | |
190 | } | |
191 | ||
192 | static void vdc_handshake_complete(struct vio_driver_state *vio) | |
193 | { | |
76e74bbe DE |
194 | struct vdc_port *port = to_vdc_port(vio); |
195 | ||
196 | del_timer(&port->ldc_reset_timer); | |
667ef3c3 | 197 | vdc_finish(vio, 0, WAITING_FOR_LINK_UP); |
76e74bbe | 198 | vdc_blk_queue_start(port); |
667ef3c3 DM |
199 | } |
200 | ||
201 | static int vdc_handle_unknown(struct vdc_port *port, void *arg) | |
202 | { | |
203 | struct vio_msg_tag *pkt = arg; | |
204 | ||
205 | printk(KERN_ERR PFX "Received unknown msg [%02x:%02x:%04x:%08x]\n", | |
206 | pkt->type, pkt->stype, pkt->stype_env, pkt->sid); | |
207 | printk(KERN_ERR PFX "Resetting connection.\n"); | |
208 | ||
209 | ldc_disconnect(port->vio.lp); | |
210 | ||
211 | return -ECONNRESET; | |
212 | } | |
213 | ||
214 | static int vdc_send_attr(struct vio_driver_state *vio) | |
215 | { | |
216 | struct vdc_port *port = to_vdc_port(vio); | |
217 | struct vio_disk_attr_info pkt; | |
218 | ||
219 | memset(&pkt, 0, sizeof(pkt)); | |
220 | ||
221 | pkt.tag.type = VIO_TYPE_CTRL; | |
222 | pkt.tag.stype = VIO_SUBTYPE_INFO; | |
223 | pkt.tag.stype_env = VIO_ATTR_INFO; | |
224 | pkt.tag.sid = vio_send_sid(vio); | |
225 | ||
226 | pkt.xfer_mode = VIO_DRING_MODE; | |
227 | pkt.vdisk_block_size = port->vdisk_block_size; | |
228 | pkt.max_xfer_size = port->max_xfer_size; | |
229 | ||
3f4528d6 | 230 | viodbg(HS, "SEND ATTR xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n", |
667ef3c3 DM |
231 | pkt.xfer_mode, pkt.vdisk_block_size, pkt.max_xfer_size); |
232 | ||
233 | return vio_ldc_send(&port->vio, &pkt, sizeof(pkt)); | |
234 | } | |
235 | ||
236 | static int vdc_handle_attr(struct vio_driver_state *vio, void *arg) | |
237 | { | |
238 | struct vdc_port *port = to_vdc_port(vio); | |
239 | struct vio_disk_attr_info *pkt = arg; | |
240 | ||
3f4528d6 | 241 | viodbg(HS, "GOT ATTR stype[0x%x] ops[%llx] disk_size[%llu] disk_type[%x] " |
9bce2182 | 242 | "mtype[0x%x] xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n", |
667ef3c3 | 243 | pkt->tag.stype, pkt->operations, |
9bce2182 | 244 | pkt->vdisk_size, pkt->vdisk_type, pkt->vdisk_mtype, |
667ef3c3 DM |
245 | pkt->xfer_mode, pkt->vdisk_block_size, |
246 | pkt->max_xfer_size); | |
247 | ||
248 | if (pkt->tag.stype == VIO_SUBTYPE_ACK) { | |
249 | switch (pkt->vdisk_type) { | |
250 | case VD_DISK_TYPE_DISK: | |
251 | case VD_DISK_TYPE_SLICE: | |
252 | break; | |
253 | ||
254 | default: | |
255 | printk(KERN_ERR PFX "%s: Bogus vdisk_type 0x%x\n", | |
256 | vio->name, pkt->vdisk_type); | |
257 | return -ECONNRESET; | |
258 | } | |
259 | ||
260 | if (pkt->vdisk_block_size > port->vdisk_block_size) { | |
261 | printk(KERN_ERR PFX "%s: BLOCK size increased " | |
262 | "%u --> %u\n", | |
263 | vio->name, | |
264 | port->vdisk_block_size, pkt->vdisk_block_size); | |
265 | return -ECONNRESET; | |
266 | } | |
267 | ||
268 | port->operations = pkt->operations; | |
667ef3c3 | 269 | port->vdisk_type = pkt->vdisk_type; |
9bce2182 AP |
270 | if (vdc_version_supported(port, 1, 1)) { |
271 | port->vdisk_size = pkt->vdisk_size; | |
272 | port->vdisk_mtype = pkt->vdisk_mtype; | |
273 | } | |
667ef3c3 DM |
274 | if (pkt->max_xfer_size < port->max_xfer_size) |
275 | port->max_xfer_size = pkt->max_xfer_size; | |
276 | port->vdisk_block_size = pkt->vdisk_block_size; | |
f41e5461 LH |
277 | |
278 | port->vdisk_phys_blksz = VDC_DEFAULT_BLK_SIZE; | |
279 | if (vdc_version_supported(port, 1, 2)) | |
280 | port->vdisk_phys_blksz = pkt->phys_block_size; | |
281 | ||
667ef3c3 DM |
282 | return 0; |
283 | } else { | |
284 | printk(KERN_ERR PFX "%s: Attribute NACK\n", vio->name); | |
285 | ||
286 | return -ECONNRESET; | |
287 | } | |
288 | } | |
289 | ||
290 | static void vdc_end_special(struct vdc_port *port, struct vio_disk_desc *desc) | |
291 | { | |
292 | int err = desc->status; | |
293 | ||
294 | vdc_finish(&port->vio, -err, WAITING_FOR_GEN_CMD); | |
295 | } | |
296 | ||
667ef3c3 DM |
297 | static void vdc_end_one(struct vdc_port *port, struct vio_dring_state *dr, |
298 | unsigned int index) | |
299 | { | |
300 | struct vio_disk_desc *desc = vio_dring_entry(dr, index); | |
301 | struct vdc_req_entry *rqe = &port->rq_arr[index]; | |
302 | struct request *req; | |
303 | ||
304 | if (unlikely(desc->hdr.state != VIO_DESC_DONE)) | |
305 | return; | |
306 | ||
307 | ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies); | |
308 | desc->hdr.state = VIO_DESC_FREE; | |
fe47c3c2 | 309 | dr->cons = vio_dring_next(dr, index); |
667ef3c3 DM |
310 | |
311 | req = rqe->req; | |
312 | if (req == NULL) { | |
313 | vdc_end_special(port, desc); | |
314 | return; | |
315 | } | |
316 | ||
317 | rqe->req = NULL; | |
318 | ||
2a842aca | 319 | __blk_end_request(req, (desc->status ? BLK_STS_IOERR : 0), desc->size); |
667ef3c3 | 320 | |
76e74bbe | 321 | vdc_blk_queue_start(port); |
667ef3c3 DM |
322 | } |
323 | ||
324 | static int vdc_ack(struct vdc_port *port, void *msgbuf) | |
325 | { | |
326 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
327 | struct vio_dring_data *pkt = msgbuf; | |
328 | ||
329 | if (unlikely(pkt->dring_ident != dr->ident || | |
330 | pkt->start_idx != pkt->end_idx || | |
331 | pkt->start_idx >= VDC_TX_RING_SIZE)) | |
332 | return 0; | |
333 | ||
334 | vdc_end_one(port, dr, pkt->start_idx); | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
339 | static int vdc_nack(struct vdc_port *port, void *msgbuf) | |
340 | { | |
341 | /* XXX Implement me XXX */ | |
342 | return 0; | |
343 | } | |
344 | ||
345 | static void vdc_event(void *arg, int event) | |
346 | { | |
347 | struct vdc_port *port = arg; | |
348 | struct vio_driver_state *vio = &port->vio; | |
349 | unsigned long flags; | |
350 | int err; | |
351 | ||
352 | spin_lock_irqsave(&vio->lock, flags); | |
353 | ||
76e74bbe | 354 | if (unlikely(event == LDC_EVENT_RESET)) { |
667ef3c3 | 355 | vio_link_state_change(vio, event); |
76e74bbe DE |
356 | queue_work(sunvdc_wq, &port->ldc_reset_work); |
357 | goto out; | |
358 | } | |
359 | ||
360 | if (unlikely(event == LDC_EVENT_UP)) { | |
361 | vio_link_state_change(vio, event); | |
362 | goto out; | |
667ef3c3 DM |
363 | } |
364 | ||
365 | if (unlikely(event != LDC_EVENT_DATA_READY)) { | |
76e74bbe DE |
366 | pr_warn(PFX "Unexpected LDC event %d\n", event); |
367 | goto out; | |
667ef3c3 DM |
368 | } |
369 | ||
370 | err = 0; | |
371 | while (1) { | |
372 | union { | |
373 | struct vio_msg_tag tag; | |
374 | u64 raw[8]; | |
375 | } msgbuf; | |
376 | ||
377 | err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf)); | |
378 | if (unlikely(err < 0)) { | |
379 | if (err == -ECONNRESET) | |
380 | vio_conn_reset(vio); | |
381 | break; | |
382 | } | |
383 | if (err == 0) | |
384 | break; | |
385 | viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n", | |
386 | msgbuf.tag.type, | |
387 | msgbuf.tag.stype, | |
388 | msgbuf.tag.stype_env, | |
389 | msgbuf.tag.sid); | |
390 | err = vio_validate_sid(vio, &msgbuf.tag); | |
391 | if (err < 0) | |
392 | break; | |
393 | ||
394 | if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) { | |
395 | if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) | |
396 | err = vdc_ack(port, &msgbuf); | |
397 | else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) | |
398 | err = vdc_nack(port, &msgbuf); | |
399 | else | |
400 | err = vdc_handle_unknown(port, &msgbuf); | |
401 | } else if (msgbuf.tag.type == VIO_TYPE_CTRL) { | |
402 | err = vio_control_pkt_engine(vio, &msgbuf); | |
403 | } else { | |
404 | err = vdc_handle_unknown(port, &msgbuf); | |
405 | } | |
406 | if (err < 0) | |
407 | break; | |
408 | } | |
409 | if (err < 0) | |
410 | vdc_finish(&port->vio, err, WAITING_FOR_ANY); | |
76e74bbe | 411 | out: |
667ef3c3 DM |
412 | spin_unlock_irqrestore(&vio->lock, flags); |
413 | } | |
414 | ||
415 | static int __vdc_tx_trigger(struct vdc_port *port) | |
416 | { | |
417 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
418 | struct vio_dring_data hdr = { | |
419 | .tag = { | |
420 | .type = VIO_TYPE_DATA, | |
421 | .stype = VIO_SUBTYPE_INFO, | |
422 | .stype_env = VIO_DRING_DATA, | |
423 | .sid = vio_send_sid(&port->vio), | |
424 | }, | |
425 | .dring_ident = dr->ident, | |
426 | .start_idx = dr->prod, | |
427 | .end_idx = dr->prod, | |
428 | }; | |
429 | int err, delay; | |
430 | ||
431 | hdr.seq = dr->snd_nxt; | |
432 | delay = 1; | |
433 | do { | |
434 | err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); | |
435 | if (err > 0) { | |
436 | dr->snd_nxt++; | |
437 | break; | |
438 | } | |
439 | udelay(delay); | |
440 | if ((delay <<= 1) > 128) | |
441 | delay = 128; | |
442 | } while (err == -EAGAIN); | |
443 | ||
76e74bbe DE |
444 | if (err == -ENOTCONN) |
445 | vdc_ldc_reset(port); | |
667ef3c3 DM |
446 | return err; |
447 | } | |
448 | ||
449 | static int __send_request(struct request *req) | |
450 | { | |
451 | struct vdc_port *port = req->rq_disk->private_data; | |
452 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
453 | struct scatterlist sg[port->ring_cookies]; | |
454 | struct vdc_req_entry *rqe; | |
455 | struct vio_disk_desc *desc; | |
456 | unsigned int map_perm; | |
457 | int nsg, err, i; | |
458 | u64 len; | |
459 | u8 op; | |
460 | ||
461 | map_perm = LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO; | |
462 | ||
463 | if (rq_data_dir(req) == READ) { | |
464 | map_perm |= LDC_MAP_W; | |
465 | op = VD_OP_BREAD; | |
466 | } else { | |
467 | map_perm |= LDC_MAP_R; | |
468 | op = VD_OP_BWRITE; | |
469 | } | |
470 | ||
45711f1a | 471 | sg_init_table(sg, port->ring_cookies); |
667ef3c3 DM |
472 | nsg = blk_rq_map_sg(req->q, req, sg); |
473 | ||
474 | len = 0; | |
475 | for (i = 0; i < nsg; i++) | |
476 | len += sg[i].length; | |
477 | ||
667ef3c3 DM |
478 | desc = vio_dring_cur(dr); |
479 | ||
480 | err = ldc_map_sg(port->vio.lp, sg, nsg, | |
481 | desc->cookies, port->ring_cookies, | |
482 | map_perm); | |
483 | if (err < 0) { | |
484 | printk(KERN_ERR PFX "ldc_map_sg() failure, err=%d.\n", err); | |
485 | return err; | |
486 | } | |
487 | ||
488 | rqe = &port->rq_arr[dr->prod]; | |
489 | rqe->req = req; | |
490 | ||
491 | desc->hdr.ack = VIO_ACK_ENABLE; | |
492 | desc->req_id = port->req_id; | |
493 | desc->operation = op; | |
494 | if (port->vdisk_type == VD_DISK_TYPE_DISK) { | |
1bd4b280 | 495 | desc->slice = 0xff; |
667ef3c3 DM |
496 | } else { |
497 | desc->slice = 0; | |
498 | } | |
499 | desc->status = ~0; | |
83096ebf | 500 | desc->offset = (blk_rq_pos(req) << 9) / port->vdisk_block_size; |
667ef3c3 DM |
501 | desc->size = len; |
502 | desc->ncookies = err; | |
503 | ||
504 | /* This has to be a non-SMP write barrier because we are writing | |
505 | * to memory which is shared with the peer LDOM. | |
506 | */ | |
507 | wmb(); | |
508 | desc->hdr.state = VIO_DESC_READY; | |
509 | ||
510 | err = __vdc_tx_trigger(port); | |
511 | if (err < 0) { | |
512 | printk(KERN_ERR PFX "vdc_tx_trigger() failure, err=%d\n", err); | |
513 | } else { | |
514 | port->req_id++; | |
fe47c3c2 | 515 | dr->prod = vio_dring_next(dr, dr->prod); |
667ef3c3 | 516 | } |
667ef3c3 DM |
517 | |
518 | return err; | |
519 | } | |
520 | ||
d0aedcd4 | 521 | static void do_vdc_request(struct request_queue *rq) |
667ef3c3 | 522 | { |
d0aedcd4 | 523 | struct request *req; |
667ef3c3 | 524 | |
d0aedcd4 DE |
525 | while ((req = blk_peek_request(rq)) != NULL) { |
526 | struct vdc_port *port; | |
527 | struct vio_dring_state *dr; | |
667ef3c3 | 528 | |
d0aedcd4 DE |
529 | port = req->rq_disk->private_data; |
530 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
531 | if (unlikely(vdc_tx_dring_avail(dr) < 1)) | |
532 | goto wait; | |
533 | ||
534 | blk_start_request(req); | |
535 | ||
536 | if (__send_request(req) < 0) { | |
537 | blk_requeue_request(rq, req); | |
538 | wait: | |
539 | /* Avoid pointless unplugs. */ | |
540 | blk_stop_queue(rq); | |
541 | break; | |
542 | } | |
667ef3c3 DM |
543 | } |
544 | } | |
545 | ||
546 | static int generic_request(struct vdc_port *port, u8 op, void *buf, int len) | |
547 | { | |
548 | struct vio_dring_state *dr; | |
549 | struct vio_completion comp; | |
550 | struct vio_disk_desc *desc; | |
551 | unsigned int map_perm; | |
552 | unsigned long flags; | |
553 | int op_len, err; | |
554 | void *req_buf; | |
555 | ||
f4d96054 | 556 | if (!(((u64)1 << (u64)op) & port->operations)) |
667ef3c3 DM |
557 | return -EOPNOTSUPP; |
558 | ||
559 | switch (op) { | |
560 | case VD_OP_BREAD: | |
561 | case VD_OP_BWRITE: | |
562 | default: | |
563 | return -EINVAL; | |
564 | ||
565 | case VD_OP_FLUSH: | |
566 | op_len = 0; | |
567 | map_perm = 0; | |
568 | break; | |
569 | ||
570 | case VD_OP_GET_WCE: | |
571 | op_len = sizeof(u32); | |
572 | map_perm = LDC_MAP_W; | |
573 | break; | |
574 | ||
575 | case VD_OP_SET_WCE: | |
576 | op_len = sizeof(u32); | |
577 | map_perm = LDC_MAP_R; | |
578 | break; | |
579 | ||
580 | case VD_OP_GET_VTOC: | |
581 | op_len = sizeof(struct vio_disk_vtoc); | |
582 | map_perm = LDC_MAP_W; | |
583 | break; | |
584 | ||
585 | case VD_OP_SET_VTOC: | |
586 | op_len = sizeof(struct vio_disk_vtoc); | |
587 | map_perm = LDC_MAP_R; | |
588 | break; | |
589 | ||
590 | case VD_OP_GET_DISKGEOM: | |
591 | op_len = sizeof(struct vio_disk_geom); | |
592 | map_perm = LDC_MAP_W; | |
593 | break; | |
594 | ||
595 | case VD_OP_SET_DISKGEOM: | |
596 | op_len = sizeof(struct vio_disk_geom); | |
597 | map_perm = LDC_MAP_R; | |
598 | break; | |
599 | ||
600 | case VD_OP_SCSICMD: | |
601 | op_len = 16; | |
602 | map_perm = LDC_MAP_RW; | |
603 | break; | |
604 | ||
605 | case VD_OP_GET_DEVID: | |
606 | op_len = sizeof(struct vio_disk_devid); | |
607 | map_perm = LDC_MAP_W; | |
608 | break; | |
609 | ||
610 | case VD_OP_GET_EFI: | |
611 | case VD_OP_SET_EFI: | |
612 | return -EOPNOTSUPP; | |
613 | break; | |
614 | }; | |
615 | ||
616 | map_perm |= LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO; | |
617 | ||
618 | op_len = (op_len + 7) & ~7; | |
619 | req_buf = kzalloc(op_len, GFP_KERNEL); | |
620 | if (!req_buf) | |
621 | return -ENOMEM; | |
622 | ||
623 | if (len > op_len) | |
624 | len = op_len; | |
625 | ||
626 | if (map_perm & LDC_MAP_R) | |
627 | memcpy(req_buf, buf, len); | |
628 | ||
629 | spin_lock_irqsave(&port->vio.lock, flags); | |
630 | ||
631 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
632 | ||
633 | /* XXX If we want to use this code generically we have to | |
634 | * XXX handle TX ring exhaustion etc. | |
635 | */ | |
636 | desc = vio_dring_cur(dr); | |
637 | ||
638 | err = ldc_map_single(port->vio.lp, req_buf, op_len, | |
639 | desc->cookies, port->ring_cookies, | |
640 | map_perm); | |
641 | if (err < 0) { | |
642 | spin_unlock_irqrestore(&port->vio.lock, flags); | |
643 | kfree(req_buf); | |
644 | return err; | |
645 | } | |
646 | ||
647 | init_completion(&comp.com); | |
648 | comp.waiting_for = WAITING_FOR_GEN_CMD; | |
649 | port->vio.cmp = ∁ | |
650 | ||
651 | desc->hdr.ack = VIO_ACK_ENABLE; | |
652 | desc->req_id = port->req_id; | |
653 | desc->operation = op; | |
654 | desc->slice = 0; | |
655 | desc->status = ~0; | |
656 | desc->offset = 0; | |
657 | desc->size = op_len; | |
658 | desc->ncookies = err; | |
659 | ||
660 | /* This has to be a non-SMP write barrier because we are writing | |
661 | * to memory which is shared with the peer LDOM. | |
662 | */ | |
663 | wmb(); | |
664 | desc->hdr.state = VIO_DESC_READY; | |
665 | ||
666 | err = __vdc_tx_trigger(port); | |
667 | if (err >= 0) { | |
668 | port->req_id++; | |
fe47c3c2 | 669 | dr->prod = vio_dring_next(dr, dr->prod); |
667ef3c3 DM |
670 | spin_unlock_irqrestore(&port->vio.lock, flags); |
671 | ||
672 | wait_for_completion(&comp.com); | |
673 | err = comp.err; | |
674 | } else { | |
675 | port->vio.cmp = NULL; | |
676 | spin_unlock_irqrestore(&port->vio.lock, flags); | |
677 | } | |
678 | ||
679 | if (map_perm & LDC_MAP_W) | |
680 | memcpy(buf, req_buf, len); | |
681 | ||
682 | kfree(req_buf); | |
683 | ||
684 | return err; | |
685 | } | |
686 | ||
8d85fce7 | 687 | static int vdc_alloc_tx_ring(struct vdc_port *port) |
667ef3c3 DM |
688 | { |
689 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
690 | unsigned long len, entry_size; | |
691 | int ncookies; | |
692 | void *dring; | |
693 | ||
694 | entry_size = sizeof(struct vio_disk_desc) + | |
695 | (sizeof(struct ldc_trans_cookie) * port->ring_cookies); | |
696 | len = (VDC_TX_RING_SIZE * entry_size); | |
697 | ||
698 | ncookies = VIO_MAX_RING_COOKIES; | |
699 | dring = ldc_alloc_exp_dring(port->vio.lp, len, | |
700 | dr->cookies, &ncookies, | |
701 | (LDC_MAP_SHADOW | | |
702 | LDC_MAP_DIRECT | | |
703 | LDC_MAP_RW)); | |
704 | if (IS_ERR(dring)) | |
705 | return PTR_ERR(dring); | |
706 | ||
707 | dr->base = dring; | |
708 | dr->entry_size = entry_size; | |
709 | dr->num_entries = VDC_TX_RING_SIZE; | |
710 | dr->prod = dr->cons = 0; | |
711 | dr->pending = VDC_TX_RING_SIZE; | |
712 | dr->ncookies = ncookies; | |
713 | ||
714 | return 0; | |
715 | } | |
716 | ||
717 | static void vdc_free_tx_ring(struct vdc_port *port) | |
718 | { | |
719 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
720 | ||
721 | if (dr->base) { | |
722 | ldc_free_exp_dring(port->vio.lp, dr->base, | |
723 | (dr->entry_size * dr->num_entries), | |
724 | dr->cookies, dr->ncookies); | |
725 | dr->base = NULL; | |
726 | dr->entry_size = 0; | |
727 | dr->num_entries = 0; | |
728 | dr->pending = 0; | |
729 | dr->ncookies = 0; | |
730 | } | |
731 | } | |
732 | ||
76e74bbe | 733 | static int vdc_port_up(struct vdc_port *port) |
667ef3c3 DM |
734 | { |
735 | struct vio_completion comp; | |
667ef3c3 DM |
736 | |
737 | init_completion(&comp.com); | |
738 | comp.err = 0; | |
739 | comp.waiting_for = WAITING_FOR_LINK_UP; | |
740 | port->vio.cmp = ∁ | |
741 | ||
742 | vio_port_up(&port->vio); | |
667ef3c3 | 743 | wait_for_completion(&comp.com); |
76e74bbe DE |
744 | return comp.err; |
745 | } | |
746 | ||
747 | static void vdc_port_down(struct vdc_port *port) | |
748 | { | |
749 | ldc_disconnect(port->vio.lp); | |
750 | ldc_unbind(port->vio.lp); | |
751 | vdc_free_tx_ring(port); | |
752 | vio_ldc_free(&port->vio); | |
753 | } | |
754 | ||
755 | static int probe_disk(struct vdc_port *port) | |
756 | { | |
757 | struct request_queue *q; | |
758 | struct gendisk *g; | |
759 | int err; | |
760 | ||
761 | err = vdc_port_up(port); | |
762 | if (err) | |
763 | return err; | |
667ef3c3 | 764 | |
f41e5461 LH |
765 | /* Using version 1.2 means vdisk_phys_blksz should be set unless the |
766 | * disk is reserved by another system. | |
767 | */ | |
768 | if (vdc_version_supported(port, 1, 2) && !port->vdisk_phys_blksz) | |
769 | return -ENODEV; | |
770 | ||
9bce2182 AP |
771 | if (vdc_version_supported(port, 1, 1)) { |
772 | /* vdisk_size should be set during the handshake, if it wasn't | |
773 | * then the underlying disk is reserved by another system | |
774 | */ | |
775 | if (port->vdisk_size == -1) | |
776 | return -ENODEV; | |
777 | } else { | |
de5b73f0 AP |
778 | struct vio_disk_geom geom; |
779 | ||
9bce2182 | 780 | err = generic_request(port, VD_OP_GET_DISKGEOM, |
de5b73f0 | 781 | &geom, sizeof(geom)); |
9bce2182 AP |
782 | if (err < 0) { |
783 | printk(KERN_ERR PFX "VD_OP_GET_DISKGEOM returns " | |
784 | "error %d\n", err); | |
785 | return err; | |
786 | } | |
de5b73f0 AP |
787 | port->vdisk_size = ((u64)geom.num_cyl * |
788 | (u64)geom.num_hd * | |
789 | (u64)geom.num_sec); | |
667ef3c3 DM |
790 | } |
791 | ||
667ef3c3 DM |
792 | q = blk_init_queue(do_vdc_request, &port->vio.lock); |
793 | if (!q) { | |
794 | printk(KERN_ERR PFX "%s: Could not allocate queue.\n", | |
795 | port->vio.name); | |
796 | return -ENOMEM; | |
797 | } | |
798 | g = alloc_disk(1 << PARTITION_SHIFT); | |
799 | if (!g) { | |
800 | printk(KERN_ERR PFX "%s: Could not allocate gendisk.\n", | |
801 | port->vio.name); | |
802 | blk_cleanup_queue(q); | |
803 | return -ENOMEM; | |
804 | } | |
805 | ||
806 | port->disk = g; | |
807 | ||
5eed69ff DE |
808 | /* Each segment in a request is up to an aligned page in size. */ |
809 | blk_queue_segment_boundary(q, PAGE_SIZE - 1); | |
810 | blk_queue_max_segment_size(q, PAGE_SIZE); | |
811 | ||
8a78362c | 812 | blk_queue_max_segments(q, port->ring_cookies); |
086fa5ff | 813 | blk_queue_max_hw_sectors(q, port->max_xfer_size); |
667ef3c3 | 814 | g->major = vdc_major; |
91ba3c21 | 815 | g->first_minor = port->vio.vdev->dev_no << PARTITION_SHIFT; |
667ef3c3 DM |
816 | strcpy(g->disk_name, port->disk_name); |
817 | ||
818 | g->fops = &vdc_fops; | |
819 | g->queue = q; | |
820 | g->private_data = port; | |
667ef3c3 DM |
821 | |
822 | set_capacity(g, port->vdisk_size); | |
823 | ||
9bce2182 AP |
824 | if (vdc_version_supported(port, 1, 1)) { |
825 | switch (port->vdisk_mtype) { | |
826 | case VD_MEDIA_TYPE_CD: | |
827 | pr_info(PFX "Virtual CDROM %s\n", port->disk_name); | |
828 | g->flags |= GENHD_FL_CD; | |
829 | g->flags |= GENHD_FL_REMOVABLE; | |
830 | set_disk_ro(g, 1); | |
831 | break; | |
832 | ||
833 | case VD_MEDIA_TYPE_DVD: | |
834 | pr_info(PFX "Virtual DVD %s\n", port->disk_name); | |
835 | g->flags |= GENHD_FL_CD; | |
836 | g->flags |= GENHD_FL_REMOVABLE; | |
837 | set_disk_ro(g, 1); | |
838 | break; | |
839 | ||
840 | case VD_MEDIA_TYPE_FIXED: | |
841 | pr_info(PFX "Virtual Hard disk %s\n", port->disk_name); | |
842 | break; | |
843 | } | |
844 | } | |
845 | ||
f41e5461 LH |
846 | blk_queue_physical_block_size(q, port->vdisk_phys_blksz); |
847 | ||
9bce2182 | 848 | pr_info(PFX "%s: %u sectors (%u MB) protocol %d.%d\n", |
667ef3c3 | 849 | g->disk_name, |
9bce2182 AP |
850 | port->vdisk_size, (port->vdisk_size >> (20 - 9)), |
851 | port->vio.ver.major, port->vio.ver.minor); | |
667ef3c3 | 852 | |
0d52c756 | 853 | device_add_disk(&port->vio.vdev->dev, g); |
667ef3c3 DM |
854 | |
855 | return 0; | |
856 | } | |
857 | ||
858 | static struct ldc_channel_config vdc_ldc_cfg = { | |
859 | .event = vdc_event, | |
860 | .mtu = 64, | |
861 | .mode = LDC_MODE_UNRELIABLE, | |
862 | }; | |
863 | ||
864 | static struct vio_driver_ops vdc_vio_ops = { | |
865 | .send_attr = vdc_send_attr, | |
866 | .handle_attr = vdc_handle_attr, | |
867 | .handshake_complete = vdc_handshake_complete, | |
868 | }; | |
869 | ||
8d85fce7 | 870 | static void print_version(void) |
80dc35df DM |
871 | { |
872 | static int version_printed; | |
873 | ||
874 | if (version_printed++ == 0) | |
875 | printk(KERN_INFO "%s", version); | |
876 | } | |
877 | ||
3ee70591 JQ |
878 | struct vdc_check_port_data { |
879 | int dev_no; | |
880 | char *type; | |
881 | }; | |
882 | ||
883 | static int vdc_device_probed(struct device *dev, void *arg) | |
884 | { | |
885 | struct vio_dev *vdev = to_vio_dev(dev); | |
886 | struct vdc_check_port_data *port_data; | |
887 | ||
888 | port_data = (struct vdc_check_port_data *)arg; | |
889 | ||
890 | if ((vdev->dev_no == port_data->dev_no) && | |
891 | (!(strcmp((char *)&vdev->type, port_data->type))) && | |
892 | dev_get_drvdata(dev)) { | |
893 | /* This device has already been configured | |
894 | * by vdc_port_probe() | |
895 | */ | |
896 | return 1; | |
897 | } else { | |
898 | return 0; | |
899 | } | |
900 | } | |
901 | ||
902 | /* Determine whether the VIO device is part of an mpgroup | |
903 | * by locating all the virtual-device-port nodes associated | |
904 | * with the parent virtual-device node for the VIO device | |
905 | * and checking whether any of these nodes are vdc-ports | |
906 | * which have already been configured. | |
907 | * | |
908 | * Returns true if this device is part of an mpgroup and has | |
909 | * already been probed. | |
910 | */ | |
911 | static bool vdc_port_mpgroup_check(struct vio_dev *vdev) | |
912 | { | |
913 | struct vdc_check_port_data port_data; | |
914 | struct device *dev; | |
915 | ||
916 | port_data.dev_no = vdev->dev_no; | |
917 | port_data.type = (char *)&vdev->type; | |
918 | ||
919 | dev = device_find_child(vdev->dev.parent, &port_data, | |
920 | vdc_device_probed); | |
921 | ||
922 | if (dev) | |
923 | return true; | |
924 | ||
925 | return false; | |
926 | } | |
927 | ||
8d85fce7 | 928 | static int vdc_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) |
667ef3c3 | 929 | { |
43fdf274 | 930 | struct mdesc_handle *hp; |
667ef3c3 | 931 | struct vdc_port *port; |
667ef3c3 | 932 | int err; |
76e74bbe | 933 | const u64 *ldc_timeout; |
667ef3c3 | 934 | |
80dc35df | 935 | print_version(); |
667ef3c3 | 936 | |
43fdf274 | 937 | hp = mdesc_grab(); |
667ef3c3 | 938 | |
43fdf274 | 939 | err = -ENODEV; |
91ba3c21 | 940 | if ((vdev->dev_no << PARTITION_SHIFT) & ~(u64)MINORMASK) { |
3f4528d6 | 941 | printk(KERN_ERR PFX "Port id [%llu] too large.\n", |
91ba3c21 | 942 | vdev->dev_no); |
43fdf274 | 943 | goto err_out_release_mdesc; |
667ef3c3 DM |
944 | } |
945 | ||
3ee70591 JQ |
946 | /* Check if this device is part of an mpgroup */ |
947 | if (vdc_port_mpgroup_check(vdev)) { | |
948 | printk(KERN_WARNING | |
949 | "VIO: Ignoring extra vdisk port %s", | |
950 | dev_name(&vdev->dev)); | |
951 | goto err_out_release_mdesc; | |
952 | } | |
953 | ||
667ef3c3 | 954 | port = kzalloc(sizeof(*port), GFP_KERNEL); |
43fdf274 | 955 | err = -ENOMEM; |
667ef3c3 DM |
956 | if (!port) { |
957 | printk(KERN_ERR PFX "Cannot allocate vdc_port.\n"); | |
43fdf274 | 958 | goto err_out_release_mdesc; |
667ef3c3 DM |
959 | } |
960 | ||
91ba3c21 | 961 | if (vdev->dev_no >= 26) |
667ef3c3 DM |
962 | snprintf(port->disk_name, sizeof(port->disk_name), |
963 | VDCBLK_NAME "%c%c", | |
91ba3c21 DM |
964 | 'a' + ((int)vdev->dev_no / 26) - 1, |
965 | 'a' + ((int)vdev->dev_no % 26)); | |
667ef3c3 DM |
966 | else |
967 | snprintf(port->disk_name, sizeof(port->disk_name), | |
91ba3c21 | 968 | VDCBLK_NAME "%c", 'a' + ((int)vdev->dev_no % 26)); |
9bce2182 | 969 | port->vdisk_size = -1; |
667ef3c3 | 970 | |
76e74bbe DE |
971 | /* Actual wall time may be double due to do_generic_file_read() doing |
972 | * a readahead I/O first, and once that fails it will try to read a | |
973 | * single page. | |
974 | */ | |
975 | ldc_timeout = mdesc_get_property(hp, vdev->mp, "vdc-timeout", NULL); | |
976 | port->ldc_timeout = ldc_timeout ? *ldc_timeout : 0; | |
e99e88a9 | 977 | timer_setup(&port->ldc_reset_timer, vdc_ldc_reset_timer, 0); |
76e74bbe DE |
978 | INIT_WORK(&port->ldc_reset_work, vdc_ldc_reset_work); |
979 | ||
43fdf274 | 980 | err = vio_driver_init(&port->vio, vdev, VDEV_DISK, |
667ef3c3 DM |
981 | vdc_versions, ARRAY_SIZE(vdc_versions), |
982 | &vdc_vio_ops, port->disk_name); | |
983 | if (err) | |
984 | goto err_out_free_port; | |
985 | ||
f41e5461 | 986 | port->vdisk_block_size = VDC_DEFAULT_BLK_SIZE; |
667ef3c3 DM |
987 | port->max_xfer_size = ((128 * 1024) / port->vdisk_block_size); |
988 | port->ring_cookies = ((port->max_xfer_size * | |
989 | port->vdisk_block_size) / PAGE_SIZE) + 2; | |
990 | ||
991 | err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port); | |
992 | if (err) | |
993 | goto err_out_free_port; | |
994 | ||
995 | err = vdc_alloc_tx_ring(port); | |
996 | if (err) | |
997 | goto err_out_free_ldc; | |
998 | ||
999 | err = probe_disk(port); | |
1000 | if (err) | |
1001 | goto err_out_free_tx_ring; | |
1002 | ||
3ee70591 JQ |
1003 | /* Note that the device driver_data is used to determine |
1004 | * whether the port has been probed. | |
1005 | */ | |
667ef3c3 DM |
1006 | dev_set_drvdata(&vdev->dev, port); |
1007 | ||
43fdf274 DM |
1008 | mdesc_release(hp); |
1009 | ||
667ef3c3 DM |
1010 | return 0; |
1011 | ||
1012 | err_out_free_tx_ring: | |
1013 | vdc_free_tx_ring(port); | |
1014 | ||
1015 | err_out_free_ldc: | |
1016 | vio_ldc_free(&port->vio); | |
1017 | ||
1018 | err_out_free_port: | |
1019 | kfree(port); | |
1020 | ||
43fdf274 DM |
1021 | err_out_release_mdesc: |
1022 | mdesc_release(hp); | |
667ef3c3 DM |
1023 | return err; |
1024 | } | |
1025 | ||
1026 | static int vdc_port_remove(struct vio_dev *vdev) | |
1027 | { | |
1028 | struct vdc_port *port = dev_get_drvdata(&vdev->dev); | |
1029 | ||
1030 | if (port) { | |
31f4888f DE |
1031 | unsigned long flags; |
1032 | ||
1033 | spin_lock_irqsave(&port->vio.lock, flags); | |
1034 | blk_stop_queue(port->disk->queue); | |
1035 | spin_unlock_irqrestore(&port->vio.lock, flags); | |
1036 | ||
76e74bbe DE |
1037 | flush_work(&port->ldc_reset_work); |
1038 | del_timer_sync(&port->ldc_reset_timer); | |
667ef3c3 DM |
1039 | del_timer_sync(&port->vio.timer); |
1040 | ||
31f4888f DE |
1041 | del_gendisk(port->disk); |
1042 | blk_cleanup_queue(port->disk->queue); | |
1043 | put_disk(port->disk); | |
1044 | port->disk = NULL; | |
1045 | ||
667ef3c3 DM |
1046 | vdc_free_tx_ring(port); |
1047 | vio_ldc_free(&port->vio); | |
1048 | ||
1049 | dev_set_drvdata(&vdev->dev, NULL); | |
1050 | ||
1051 | kfree(port); | |
1052 | } | |
1053 | return 0; | |
1054 | } | |
1055 | ||
76e74bbe DE |
1056 | static void vdc_requeue_inflight(struct vdc_port *port) |
1057 | { | |
1058 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
1059 | u32 idx; | |
1060 | ||
1061 | for (idx = dr->cons; idx != dr->prod; idx = vio_dring_next(dr, idx)) { | |
1062 | struct vio_disk_desc *desc = vio_dring_entry(dr, idx); | |
1063 | struct vdc_req_entry *rqe = &port->rq_arr[idx]; | |
1064 | struct request *req; | |
1065 | ||
1066 | ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies); | |
1067 | desc->hdr.state = VIO_DESC_FREE; | |
1068 | dr->cons = vio_dring_next(dr, idx); | |
1069 | ||
1070 | req = rqe->req; | |
1071 | if (req == NULL) { | |
1072 | vdc_end_special(port, desc); | |
1073 | continue; | |
1074 | } | |
1075 | ||
1076 | rqe->req = NULL; | |
1077 | blk_requeue_request(port->disk->queue, req); | |
1078 | } | |
1079 | } | |
1080 | ||
1081 | static void vdc_queue_drain(struct vdc_port *port) | |
1082 | { | |
1083 | struct request *req; | |
1084 | ||
1085 | while ((req = blk_fetch_request(port->disk->queue)) != NULL) | |
2a842aca | 1086 | __blk_end_request_all(req, BLK_STS_IOERR); |
76e74bbe DE |
1087 | } |
1088 | ||
e99e88a9 | 1089 | static void vdc_ldc_reset_timer(struct timer_list *t) |
76e74bbe | 1090 | { |
e99e88a9 | 1091 | struct vdc_port *port = from_timer(port, t, ldc_reset_timer); |
76e74bbe DE |
1092 | struct vio_driver_state *vio = &port->vio; |
1093 | unsigned long flags; | |
1094 | ||
1095 | spin_lock_irqsave(&vio->lock, flags); | |
1096 | if (!(port->vio.hs_state & VIO_HS_COMPLETE)) { | |
1097 | pr_warn(PFX "%s ldc down %llu seconds, draining queue\n", | |
1098 | port->disk_name, port->ldc_timeout); | |
1099 | vdc_queue_drain(port); | |
1100 | vdc_blk_queue_start(port); | |
1101 | } | |
1102 | spin_unlock_irqrestore(&vio->lock, flags); | |
1103 | } | |
1104 | ||
1105 | static void vdc_ldc_reset_work(struct work_struct *work) | |
1106 | { | |
1107 | struct vdc_port *port; | |
1108 | struct vio_driver_state *vio; | |
1109 | unsigned long flags; | |
1110 | ||
1111 | port = container_of(work, struct vdc_port, ldc_reset_work); | |
1112 | vio = &port->vio; | |
1113 | ||
1114 | spin_lock_irqsave(&vio->lock, flags); | |
1115 | vdc_ldc_reset(port); | |
1116 | spin_unlock_irqrestore(&vio->lock, flags); | |
1117 | } | |
1118 | ||
1119 | static void vdc_ldc_reset(struct vdc_port *port) | |
1120 | { | |
1121 | int err; | |
1122 | ||
1123 | assert_spin_locked(&port->vio.lock); | |
1124 | ||
1125 | pr_warn(PFX "%s ldc link reset\n", port->disk_name); | |
1126 | blk_stop_queue(port->disk->queue); | |
1127 | vdc_requeue_inflight(port); | |
1128 | vdc_port_down(port); | |
1129 | ||
1130 | err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port); | |
1131 | if (err) { | |
1132 | pr_err(PFX "%s vio_ldc_alloc:%d\n", port->disk_name, err); | |
1133 | return; | |
1134 | } | |
1135 | ||
1136 | err = vdc_alloc_tx_ring(port); | |
1137 | if (err) { | |
1138 | pr_err(PFX "%s vio_alloc_tx_ring:%d\n", port->disk_name, err); | |
1139 | goto err_free_ldc; | |
1140 | } | |
1141 | ||
1142 | if (port->ldc_timeout) | |
1143 | mod_timer(&port->ldc_reset_timer, | |
1144 | round_jiffies(jiffies + HZ * port->ldc_timeout)); | |
1145 | mod_timer(&port->vio.timer, round_jiffies(jiffies + HZ)); | |
1146 | return; | |
1147 | ||
1148 | err_free_ldc: | |
1149 | vio_ldc_free(&port->vio); | |
1150 | } | |
1151 | ||
3d452e55 | 1152 | static const struct vio_device_id vdc_port_match[] = { |
667ef3c3 DM |
1153 | { |
1154 | .type = "vdc-port", | |
1155 | }, | |
1156 | {}, | |
1157 | }; | |
da68e081 | 1158 | MODULE_DEVICE_TABLE(vio, vdc_port_match); |
667ef3c3 DM |
1159 | |
1160 | static struct vio_driver vdc_port_driver = { | |
1161 | .id_table = vdc_port_match, | |
1162 | .probe = vdc_port_probe, | |
1163 | .remove = vdc_port_remove, | |
cb52d897 | 1164 | .name = "vdc_port", |
667ef3c3 DM |
1165 | }; |
1166 | ||
667ef3c3 DM |
1167 | static int __init vdc_init(void) |
1168 | { | |
1169 | int err; | |
1170 | ||
76e74bbe DE |
1171 | sunvdc_wq = alloc_workqueue("sunvdc", 0, 0); |
1172 | if (!sunvdc_wq) | |
1173 | return -ENOMEM; | |
1174 | ||
667ef3c3 DM |
1175 | err = register_blkdev(0, VDCBLK_NAME); |
1176 | if (err < 0) | |
76e74bbe | 1177 | goto out_free_wq; |
667ef3c3 DM |
1178 | |
1179 | vdc_major = err; | |
667ef3c3 DM |
1180 | |
1181 | err = vio_register_driver(&vdc_port_driver); | |
1182 | if (err) | |
80dc35df | 1183 | goto out_unregister_blkdev; |
667ef3c3 DM |
1184 | |
1185 | return 0; | |
1186 | ||
667ef3c3 DM |
1187 | out_unregister_blkdev: |
1188 | unregister_blkdev(vdc_major, VDCBLK_NAME); | |
1189 | vdc_major = 0; | |
1190 | ||
76e74bbe DE |
1191 | out_free_wq: |
1192 | destroy_workqueue(sunvdc_wq); | |
667ef3c3 DM |
1193 | return err; |
1194 | } | |
1195 | ||
1196 | static void __exit vdc_exit(void) | |
1197 | { | |
1198 | vio_unregister_driver(&vdc_port_driver); | |
667ef3c3 | 1199 | unregister_blkdev(vdc_major, VDCBLK_NAME); |
76e74bbe | 1200 | destroy_workqueue(sunvdc_wq); |
667ef3c3 DM |
1201 | } |
1202 | ||
1203 | module_init(vdc_init); | |
1204 | module_exit(vdc_exit); |