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Commit | Line | Data |
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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 | ||
5d2f1a02 YX |
44 | #define VDC_MAX_RETRIES 10 |
45 | ||
76e74bbe DE |
46 | static struct workqueue_struct *sunvdc_wq; |
47 | ||
667ef3c3 DM |
48 | struct vdc_req_entry { |
49 | struct request *req; | |
50 | }; | |
51 | ||
52 | struct vdc_port { | |
53 | struct vio_driver_state vio; | |
54 | ||
667ef3c3 DM |
55 | struct gendisk *disk; |
56 | ||
57 | struct vdc_completion *cmp; | |
58 | ||
59 | u64 req_id; | |
60 | u64 seq; | |
61 | struct vdc_req_entry rq_arr[VDC_TX_RING_SIZE]; | |
62 | ||
63 | unsigned long ring_cookies; | |
64 | ||
65 | u64 max_xfer_size; | |
66 | u32 vdisk_block_size; | |
67 | ||
76e74bbe DE |
68 | u64 ldc_timeout; |
69 | struct timer_list ldc_reset_timer; | |
70 | struct work_struct ldc_reset_work; | |
71 | ||
667ef3c3 DM |
72 | /* The server fills these in for us in the disk attribute |
73 | * ACK packet. | |
74 | */ | |
75 | u64 operations; | |
76 | u32 vdisk_size; | |
77 | u8 vdisk_type; | |
9bce2182 | 78 | u8 vdisk_mtype; |
f41e5461 | 79 | u32 vdisk_phys_blksz; |
667ef3c3 DM |
80 | |
81 | char disk_name[32]; | |
667ef3c3 DM |
82 | }; |
83 | ||
76e74bbe DE |
84 | static void vdc_ldc_reset(struct vdc_port *port); |
85 | static void vdc_ldc_reset_work(struct work_struct *work); | |
e99e88a9 | 86 | static void vdc_ldc_reset_timer(struct timer_list *t); |
76e74bbe | 87 | |
667ef3c3 DM |
88 | static inline struct vdc_port *to_vdc_port(struct vio_driver_state *vio) |
89 | { | |
90 | return container_of(vio, struct vdc_port, vio); | |
91 | } | |
92 | ||
667ef3c3 DM |
93 | /* Ordered from largest major to lowest */ |
94 | static struct vio_version vdc_versions[] = { | |
f41e5461 | 95 | { .major = 1, .minor = 2 }, |
9bce2182 | 96 | { .major = 1, .minor = 1 }, |
667ef3c3 DM |
97 | { .major = 1, .minor = 0 }, |
98 | }; | |
99 | ||
9bce2182 AP |
100 | static inline int vdc_version_supported(struct vdc_port *port, |
101 | u16 major, u16 minor) | |
102 | { | |
103 | return port->vio.ver.major == major && port->vio.ver.minor >= minor; | |
104 | } | |
105 | ||
667ef3c3 DM |
106 | #define VDCBLK_NAME "vdisk" |
107 | static int vdc_major; | |
108 | #define PARTITION_SHIFT 3 | |
109 | ||
110 | static inline u32 vdc_tx_dring_avail(struct vio_dring_state *dr) | |
111 | { | |
112 | return vio_dring_avail(dr, VDC_TX_RING_SIZE); | |
113 | } | |
114 | ||
115 | static int vdc_getgeo(struct block_device *bdev, struct hd_geometry *geo) | |
116 | { | |
117 | struct gendisk *disk = bdev->bd_disk; | |
de5b73f0 AP |
118 | sector_t nsect = get_capacity(disk); |
119 | sector_t cylinders = nsect; | |
667ef3c3 | 120 | |
de5b73f0 AP |
121 | geo->heads = 0xff; |
122 | geo->sectors = 0x3f; | |
123 | sector_div(cylinders, geo->heads * geo->sectors); | |
124 | geo->cylinders = cylinders; | |
125 | if ((sector_t)(geo->cylinders + 1) * geo->heads * geo->sectors < nsect) | |
126 | geo->cylinders = 0xffff; | |
667ef3c3 DM |
127 | |
128 | return 0; | |
129 | } | |
130 | ||
9bce2182 AP |
131 | /* Add ioctl/CDROM_GET_CAPABILITY to support cdrom_id in udev |
132 | * when vdisk_mtype is VD_MEDIA_TYPE_CD or VD_MEDIA_TYPE_DVD. | |
133 | * Needed to be able to install inside an ldom from an iso image. | |
134 | */ | |
135 | static int vdc_ioctl(struct block_device *bdev, fmode_t mode, | |
136 | unsigned command, unsigned long argument) | |
137 | { | |
138 | int i; | |
139 | struct gendisk *disk; | |
140 | ||
141 | switch (command) { | |
142 | case CDROMMULTISESSION: | |
143 | pr_debug(PFX "Multisession CDs not supported\n"); | |
144 | for (i = 0; i < sizeof(struct cdrom_multisession); i++) | |
145 | if (put_user(0, (char __user *)(argument + i))) | |
146 | return -EFAULT; | |
147 | return 0; | |
148 | ||
149 | case CDROM_GET_CAPABILITY: | |
150 | disk = bdev->bd_disk; | |
151 | ||
152 | if (bdev->bd_disk && (disk->flags & GENHD_FL_CD)) | |
153 | return 0; | |
154 | return -EINVAL; | |
155 | ||
156 | default: | |
157 | pr_debug(PFX "ioctl %08x not supported\n", command); | |
158 | return -EINVAL; | |
159 | } | |
160 | } | |
161 | ||
83d5cde4 | 162 | static const struct block_device_operations vdc_fops = { |
667ef3c3 DM |
163 | .owner = THIS_MODULE, |
164 | .getgeo = vdc_getgeo, | |
9bce2182 | 165 | .ioctl = vdc_ioctl, |
667ef3c3 DM |
166 | }; |
167 | ||
76e74bbe DE |
168 | static void vdc_blk_queue_start(struct vdc_port *port) |
169 | { | |
170 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
171 | ||
172 | /* restart blk queue when ring is half emptied. also called after | |
173 | * handshake completes, so check for initial handshake before we've | |
174 | * allocated a disk. | |
175 | */ | |
176 | if (port->disk && blk_queue_stopped(port->disk->queue) && | |
177 | vdc_tx_dring_avail(dr) * 100 / VDC_TX_RING_SIZE >= 50) { | |
178 | blk_start_queue(port->disk->queue); | |
179 | } | |
180 | ||
181 | } | |
182 | ||
667ef3c3 DM |
183 | static void vdc_finish(struct vio_driver_state *vio, int err, int waiting_for) |
184 | { | |
185 | if (vio->cmp && | |
186 | (waiting_for == -1 || | |
187 | vio->cmp->waiting_for == waiting_for)) { | |
188 | vio->cmp->err = err; | |
189 | complete(&vio->cmp->com); | |
190 | vio->cmp = NULL; | |
191 | } | |
192 | } | |
193 | ||
194 | static void vdc_handshake_complete(struct vio_driver_state *vio) | |
195 | { | |
76e74bbe DE |
196 | struct vdc_port *port = to_vdc_port(vio); |
197 | ||
198 | del_timer(&port->ldc_reset_timer); | |
667ef3c3 | 199 | vdc_finish(vio, 0, WAITING_FOR_LINK_UP); |
76e74bbe | 200 | vdc_blk_queue_start(port); |
667ef3c3 DM |
201 | } |
202 | ||
203 | static int vdc_handle_unknown(struct vdc_port *port, void *arg) | |
204 | { | |
205 | struct vio_msg_tag *pkt = arg; | |
206 | ||
207 | printk(KERN_ERR PFX "Received unknown msg [%02x:%02x:%04x:%08x]\n", | |
208 | pkt->type, pkt->stype, pkt->stype_env, pkt->sid); | |
209 | printk(KERN_ERR PFX "Resetting connection.\n"); | |
210 | ||
211 | ldc_disconnect(port->vio.lp); | |
212 | ||
213 | return -ECONNRESET; | |
214 | } | |
215 | ||
216 | static int vdc_send_attr(struct vio_driver_state *vio) | |
217 | { | |
218 | struct vdc_port *port = to_vdc_port(vio); | |
219 | struct vio_disk_attr_info pkt; | |
220 | ||
221 | memset(&pkt, 0, sizeof(pkt)); | |
222 | ||
223 | pkt.tag.type = VIO_TYPE_CTRL; | |
224 | pkt.tag.stype = VIO_SUBTYPE_INFO; | |
225 | pkt.tag.stype_env = VIO_ATTR_INFO; | |
226 | pkt.tag.sid = vio_send_sid(vio); | |
227 | ||
228 | pkt.xfer_mode = VIO_DRING_MODE; | |
229 | pkt.vdisk_block_size = port->vdisk_block_size; | |
230 | pkt.max_xfer_size = port->max_xfer_size; | |
231 | ||
3f4528d6 | 232 | viodbg(HS, "SEND ATTR xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n", |
667ef3c3 DM |
233 | pkt.xfer_mode, pkt.vdisk_block_size, pkt.max_xfer_size); |
234 | ||
235 | return vio_ldc_send(&port->vio, &pkt, sizeof(pkt)); | |
236 | } | |
237 | ||
238 | static int vdc_handle_attr(struct vio_driver_state *vio, void *arg) | |
239 | { | |
240 | struct vdc_port *port = to_vdc_port(vio); | |
241 | struct vio_disk_attr_info *pkt = arg; | |
242 | ||
3f4528d6 | 243 | viodbg(HS, "GOT ATTR stype[0x%x] ops[%llx] disk_size[%llu] disk_type[%x] " |
9bce2182 | 244 | "mtype[0x%x] xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n", |
667ef3c3 | 245 | pkt->tag.stype, pkt->operations, |
9bce2182 | 246 | pkt->vdisk_size, pkt->vdisk_type, pkt->vdisk_mtype, |
667ef3c3 DM |
247 | pkt->xfer_mode, pkt->vdisk_block_size, |
248 | pkt->max_xfer_size); | |
249 | ||
250 | if (pkt->tag.stype == VIO_SUBTYPE_ACK) { | |
251 | switch (pkt->vdisk_type) { | |
252 | case VD_DISK_TYPE_DISK: | |
253 | case VD_DISK_TYPE_SLICE: | |
254 | break; | |
255 | ||
256 | default: | |
257 | printk(KERN_ERR PFX "%s: Bogus vdisk_type 0x%x\n", | |
258 | vio->name, pkt->vdisk_type); | |
259 | return -ECONNRESET; | |
260 | } | |
261 | ||
262 | if (pkt->vdisk_block_size > port->vdisk_block_size) { | |
263 | printk(KERN_ERR PFX "%s: BLOCK size increased " | |
264 | "%u --> %u\n", | |
265 | vio->name, | |
266 | port->vdisk_block_size, pkt->vdisk_block_size); | |
267 | return -ECONNRESET; | |
268 | } | |
269 | ||
270 | port->operations = pkt->operations; | |
667ef3c3 | 271 | port->vdisk_type = pkt->vdisk_type; |
9bce2182 AP |
272 | if (vdc_version_supported(port, 1, 1)) { |
273 | port->vdisk_size = pkt->vdisk_size; | |
274 | port->vdisk_mtype = pkt->vdisk_mtype; | |
275 | } | |
667ef3c3 DM |
276 | if (pkt->max_xfer_size < port->max_xfer_size) |
277 | port->max_xfer_size = pkt->max_xfer_size; | |
278 | port->vdisk_block_size = pkt->vdisk_block_size; | |
f41e5461 LH |
279 | |
280 | port->vdisk_phys_blksz = VDC_DEFAULT_BLK_SIZE; | |
281 | if (vdc_version_supported(port, 1, 2)) | |
282 | port->vdisk_phys_blksz = pkt->phys_block_size; | |
283 | ||
667ef3c3 DM |
284 | return 0; |
285 | } else { | |
286 | printk(KERN_ERR PFX "%s: Attribute NACK\n", vio->name); | |
287 | ||
288 | return -ECONNRESET; | |
289 | } | |
290 | } | |
291 | ||
292 | static void vdc_end_special(struct vdc_port *port, struct vio_disk_desc *desc) | |
293 | { | |
294 | int err = desc->status; | |
295 | ||
296 | vdc_finish(&port->vio, -err, WAITING_FOR_GEN_CMD); | |
297 | } | |
298 | ||
667ef3c3 DM |
299 | static void vdc_end_one(struct vdc_port *port, struct vio_dring_state *dr, |
300 | unsigned int index) | |
301 | { | |
302 | struct vio_disk_desc *desc = vio_dring_entry(dr, index); | |
303 | struct vdc_req_entry *rqe = &port->rq_arr[index]; | |
304 | struct request *req; | |
305 | ||
306 | if (unlikely(desc->hdr.state != VIO_DESC_DONE)) | |
307 | return; | |
308 | ||
309 | ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies); | |
310 | desc->hdr.state = VIO_DESC_FREE; | |
fe47c3c2 | 311 | dr->cons = vio_dring_next(dr, index); |
667ef3c3 DM |
312 | |
313 | req = rqe->req; | |
314 | if (req == NULL) { | |
315 | vdc_end_special(port, desc); | |
316 | return; | |
317 | } | |
318 | ||
319 | rqe->req = NULL; | |
320 | ||
2a842aca | 321 | __blk_end_request(req, (desc->status ? BLK_STS_IOERR : 0), desc->size); |
667ef3c3 | 322 | |
76e74bbe | 323 | vdc_blk_queue_start(port); |
667ef3c3 DM |
324 | } |
325 | ||
326 | static int vdc_ack(struct vdc_port *port, void *msgbuf) | |
327 | { | |
328 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
329 | struct vio_dring_data *pkt = msgbuf; | |
330 | ||
331 | if (unlikely(pkt->dring_ident != dr->ident || | |
332 | pkt->start_idx != pkt->end_idx || | |
333 | pkt->start_idx >= VDC_TX_RING_SIZE)) | |
334 | return 0; | |
335 | ||
336 | vdc_end_one(port, dr, pkt->start_idx); | |
337 | ||
338 | return 0; | |
339 | } | |
340 | ||
341 | static int vdc_nack(struct vdc_port *port, void *msgbuf) | |
342 | { | |
343 | /* XXX Implement me XXX */ | |
344 | return 0; | |
345 | } | |
346 | ||
347 | static void vdc_event(void *arg, int event) | |
348 | { | |
349 | struct vdc_port *port = arg; | |
350 | struct vio_driver_state *vio = &port->vio; | |
351 | unsigned long flags; | |
352 | int err; | |
353 | ||
354 | spin_lock_irqsave(&vio->lock, flags); | |
355 | ||
76e74bbe | 356 | if (unlikely(event == LDC_EVENT_RESET)) { |
667ef3c3 | 357 | vio_link_state_change(vio, event); |
76e74bbe DE |
358 | queue_work(sunvdc_wq, &port->ldc_reset_work); |
359 | goto out; | |
360 | } | |
361 | ||
362 | if (unlikely(event == LDC_EVENT_UP)) { | |
363 | vio_link_state_change(vio, event); | |
364 | goto out; | |
667ef3c3 DM |
365 | } |
366 | ||
367 | if (unlikely(event != LDC_EVENT_DATA_READY)) { | |
76e74bbe DE |
368 | pr_warn(PFX "Unexpected LDC event %d\n", event); |
369 | goto out; | |
667ef3c3 DM |
370 | } |
371 | ||
372 | err = 0; | |
373 | while (1) { | |
374 | union { | |
375 | struct vio_msg_tag tag; | |
376 | u64 raw[8]; | |
377 | } msgbuf; | |
378 | ||
379 | err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf)); | |
380 | if (unlikely(err < 0)) { | |
381 | if (err == -ECONNRESET) | |
382 | vio_conn_reset(vio); | |
383 | break; | |
384 | } | |
385 | if (err == 0) | |
386 | break; | |
387 | viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n", | |
388 | msgbuf.tag.type, | |
389 | msgbuf.tag.stype, | |
390 | msgbuf.tag.stype_env, | |
391 | msgbuf.tag.sid); | |
392 | err = vio_validate_sid(vio, &msgbuf.tag); | |
393 | if (err < 0) | |
394 | break; | |
395 | ||
396 | if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) { | |
397 | if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) | |
398 | err = vdc_ack(port, &msgbuf); | |
399 | else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) | |
400 | err = vdc_nack(port, &msgbuf); | |
401 | else | |
402 | err = vdc_handle_unknown(port, &msgbuf); | |
403 | } else if (msgbuf.tag.type == VIO_TYPE_CTRL) { | |
404 | err = vio_control_pkt_engine(vio, &msgbuf); | |
405 | } else { | |
406 | err = vdc_handle_unknown(port, &msgbuf); | |
407 | } | |
408 | if (err < 0) | |
409 | break; | |
410 | } | |
411 | if (err < 0) | |
412 | vdc_finish(&port->vio, err, WAITING_FOR_ANY); | |
76e74bbe | 413 | out: |
667ef3c3 DM |
414 | spin_unlock_irqrestore(&vio->lock, flags); |
415 | } | |
416 | ||
417 | static int __vdc_tx_trigger(struct vdc_port *port) | |
418 | { | |
419 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
420 | struct vio_dring_data hdr = { | |
421 | .tag = { | |
422 | .type = VIO_TYPE_DATA, | |
423 | .stype = VIO_SUBTYPE_INFO, | |
424 | .stype_env = VIO_DRING_DATA, | |
425 | .sid = vio_send_sid(&port->vio), | |
426 | }, | |
427 | .dring_ident = dr->ident, | |
428 | .start_idx = dr->prod, | |
429 | .end_idx = dr->prod, | |
430 | }; | |
431 | int err, delay; | |
5d2f1a02 | 432 | int retries = 0; |
667ef3c3 DM |
433 | |
434 | hdr.seq = dr->snd_nxt; | |
435 | delay = 1; | |
436 | do { | |
437 | err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); | |
438 | if (err > 0) { | |
439 | dr->snd_nxt++; | |
440 | break; | |
441 | } | |
442 | udelay(delay); | |
443 | if ((delay <<= 1) > 128) | |
444 | delay = 128; | |
5d2f1a02 YX |
445 | if (retries++ > VDC_MAX_RETRIES) |
446 | break; | |
667ef3c3 DM |
447 | } while (err == -EAGAIN); |
448 | ||
76e74bbe DE |
449 | if (err == -ENOTCONN) |
450 | vdc_ldc_reset(port); | |
667ef3c3 DM |
451 | return err; |
452 | } | |
453 | ||
454 | static int __send_request(struct request *req) | |
455 | { | |
456 | struct vdc_port *port = req->rq_disk->private_data; | |
457 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
458 | struct scatterlist sg[port->ring_cookies]; | |
459 | struct vdc_req_entry *rqe; | |
460 | struct vio_disk_desc *desc; | |
461 | unsigned int map_perm; | |
462 | int nsg, err, i; | |
463 | u64 len; | |
464 | u8 op; | |
465 | ||
466 | map_perm = LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO; | |
467 | ||
468 | if (rq_data_dir(req) == READ) { | |
469 | map_perm |= LDC_MAP_W; | |
470 | op = VD_OP_BREAD; | |
471 | } else { | |
472 | map_perm |= LDC_MAP_R; | |
473 | op = VD_OP_BWRITE; | |
474 | } | |
475 | ||
45711f1a | 476 | sg_init_table(sg, port->ring_cookies); |
667ef3c3 DM |
477 | nsg = blk_rq_map_sg(req->q, req, sg); |
478 | ||
479 | len = 0; | |
480 | for (i = 0; i < nsg; i++) | |
481 | len += sg[i].length; | |
482 | ||
667ef3c3 DM |
483 | desc = vio_dring_cur(dr); |
484 | ||
485 | err = ldc_map_sg(port->vio.lp, sg, nsg, | |
486 | desc->cookies, port->ring_cookies, | |
487 | map_perm); | |
488 | if (err < 0) { | |
489 | printk(KERN_ERR PFX "ldc_map_sg() failure, err=%d.\n", err); | |
490 | return err; | |
491 | } | |
492 | ||
493 | rqe = &port->rq_arr[dr->prod]; | |
494 | rqe->req = req; | |
495 | ||
496 | desc->hdr.ack = VIO_ACK_ENABLE; | |
497 | desc->req_id = port->req_id; | |
498 | desc->operation = op; | |
499 | if (port->vdisk_type == VD_DISK_TYPE_DISK) { | |
1bd4b280 | 500 | desc->slice = 0xff; |
667ef3c3 DM |
501 | } else { |
502 | desc->slice = 0; | |
503 | } | |
504 | desc->status = ~0; | |
83096ebf | 505 | desc->offset = (blk_rq_pos(req) << 9) / port->vdisk_block_size; |
667ef3c3 DM |
506 | desc->size = len; |
507 | desc->ncookies = err; | |
508 | ||
509 | /* This has to be a non-SMP write barrier because we are writing | |
510 | * to memory which is shared with the peer LDOM. | |
511 | */ | |
512 | wmb(); | |
513 | desc->hdr.state = VIO_DESC_READY; | |
514 | ||
515 | err = __vdc_tx_trigger(port); | |
516 | if (err < 0) { | |
517 | printk(KERN_ERR PFX "vdc_tx_trigger() failure, err=%d\n", err); | |
518 | } else { | |
519 | port->req_id++; | |
fe47c3c2 | 520 | dr->prod = vio_dring_next(dr, dr->prod); |
667ef3c3 | 521 | } |
667ef3c3 DM |
522 | |
523 | return err; | |
524 | } | |
525 | ||
d0aedcd4 | 526 | static void do_vdc_request(struct request_queue *rq) |
667ef3c3 | 527 | { |
d0aedcd4 | 528 | struct request *req; |
667ef3c3 | 529 | |
d0aedcd4 DE |
530 | while ((req = blk_peek_request(rq)) != NULL) { |
531 | struct vdc_port *port; | |
532 | struct vio_dring_state *dr; | |
667ef3c3 | 533 | |
d0aedcd4 DE |
534 | port = req->rq_disk->private_data; |
535 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
536 | if (unlikely(vdc_tx_dring_avail(dr) < 1)) | |
537 | goto wait; | |
538 | ||
539 | blk_start_request(req); | |
540 | ||
541 | if (__send_request(req) < 0) { | |
542 | blk_requeue_request(rq, req); | |
543 | wait: | |
544 | /* Avoid pointless unplugs. */ | |
545 | blk_stop_queue(rq); | |
546 | break; | |
547 | } | |
667ef3c3 DM |
548 | } |
549 | } | |
550 | ||
551 | static int generic_request(struct vdc_port *port, u8 op, void *buf, int len) | |
552 | { | |
553 | struct vio_dring_state *dr; | |
554 | struct vio_completion comp; | |
555 | struct vio_disk_desc *desc; | |
556 | unsigned int map_perm; | |
557 | unsigned long flags; | |
558 | int op_len, err; | |
559 | void *req_buf; | |
560 | ||
f4d96054 | 561 | if (!(((u64)1 << (u64)op) & port->operations)) |
667ef3c3 DM |
562 | return -EOPNOTSUPP; |
563 | ||
564 | switch (op) { | |
565 | case VD_OP_BREAD: | |
566 | case VD_OP_BWRITE: | |
567 | default: | |
568 | return -EINVAL; | |
569 | ||
570 | case VD_OP_FLUSH: | |
571 | op_len = 0; | |
572 | map_perm = 0; | |
573 | break; | |
574 | ||
575 | case VD_OP_GET_WCE: | |
576 | op_len = sizeof(u32); | |
577 | map_perm = LDC_MAP_W; | |
578 | break; | |
579 | ||
580 | case VD_OP_SET_WCE: | |
581 | op_len = sizeof(u32); | |
582 | map_perm = LDC_MAP_R; | |
583 | break; | |
584 | ||
585 | case VD_OP_GET_VTOC: | |
586 | op_len = sizeof(struct vio_disk_vtoc); | |
587 | map_perm = LDC_MAP_W; | |
588 | break; | |
589 | ||
590 | case VD_OP_SET_VTOC: | |
591 | op_len = sizeof(struct vio_disk_vtoc); | |
592 | map_perm = LDC_MAP_R; | |
593 | break; | |
594 | ||
595 | case VD_OP_GET_DISKGEOM: | |
596 | op_len = sizeof(struct vio_disk_geom); | |
597 | map_perm = LDC_MAP_W; | |
598 | break; | |
599 | ||
600 | case VD_OP_SET_DISKGEOM: | |
601 | op_len = sizeof(struct vio_disk_geom); | |
602 | map_perm = LDC_MAP_R; | |
603 | break; | |
604 | ||
605 | case VD_OP_SCSICMD: | |
606 | op_len = 16; | |
607 | map_perm = LDC_MAP_RW; | |
608 | break; | |
609 | ||
610 | case VD_OP_GET_DEVID: | |
611 | op_len = sizeof(struct vio_disk_devid); | |
612 | map_perm = LDC_MAP_W; | |
613 | break; | |
614 | ||
615 | case VD_OP_GET_EFI: | |
616 | case VD_OP_SET_EFI: | |
617 | return -EOPNOTSUPP; | |
618 | break; | |
619 | }; | |
620 | ||
621 | map_perm |= LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO; | |
622 | ||
623 | op_len = (op_len + 7) & ~7; | |
624 | req_buf = kzalloc(op_len, GFP_KERNEL); | |
625 | if (!req_buf) | |
626 | return -ENOMEM; | |
627 | ||
628 | if (len > op_len) | |
629 | len = op_len; | |
630 | ||
631 | if (map_perm & LDC_MAP_R) | |
632 | memcpy(req_buf, buf, len); | |
633 | ||
634 | spin_lock_irqsave(&port->vio.lock, flags); | |
635 | ||
636 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
637 | ||
638 | /* XXX If we want to use this code generically we have to | |
639 | * XXX handle TX ring exhaustion etc. | |
640 | */ | |
641 | desc = vio_dring_cur(dr); | |
642 | ||
643 | err = ldc_map_single(port->vio.lp, req_buf, op_len, | |
644 | desc->cookies, port->ring_cookies, | |
645 | map_perm); | |
646 | if (err < 0) { | |
647 | spin_unlock_irqrestore(&port->vio.lock, flags); | |
648 | kfree(req_buf); | |
649 | return err; | |
650 | } | |
651 | ||
652 | init_completion(&comp.com); | |
653 | comp.waiting_for = WAITING_FOR_GEN_CMD; | |
654 | port->vio.cmp = ∁ | |
655 | ||
656 | desc->hdr.ack = VIO_ACK_ENABLE; | |
657 | desc->req_id = port->req_id; | |
658 | desc->operation = op; | |
659 | desc->slice = 0; | |
660 | desc->status = ~0; | |
661 | desc->offset = 0; | |
662 | desc->size = op_len; | |
663 | desc->ncookies = err; | |
664 | ||
665 | /* This has to be a non-SMP write barrier because we are writing | |
666 | * to memory which is shared with the peer LDOM. | |
667 | */ | |
668 | wmb(); | |
669 | desc->hdr.state = VIO_DESC_READY; | |
670 | ||
671 | err = __vdc_tx_trigger(port); | |
672 | if (err >= 0) { | |
673 | port->req_id++; | |
fe47c3c2 | 674 | dr->prod = vio_dring_next(dr, dr->prod); |
667ef3c3 DM |
675 | spin_unlock_irqrestore(&port->vio.lock, flags); |
676 | ||
677 | wait_for_completion(&comp.com); | |
678 | err = comp.err; | |
679 | } else { | |
680 | port->vio.cmp = NULL; | |
681 | spin_unlock_irqrestore(&port->vio.lock, flags); | |
682 | } | |
683 | ||
684 | if (map_perm & LDC_MAP_W) | |
685 | memcpy(buf, req_buf, len); | |
686 | ||
687 | kfree(req_buf); | |
688 | ||
689 | return err; | |
690 | } | |
691 | ||
8d85fce7 | 692 | static int vdc_alloc_tx_ring(struct vdc_port *port) |
667ef3c3 DM |
693 | { |
694 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
695 | unsigned long len, entry_size; | |
696 | int ncookies; | |
697 | void *dring; | |
698 | ||
699 | entry_size = sizeof(struct vio_disk_desc) + | |
700 | (sizeof(struct ldc_trans_cookie) * port->ring_cookies); | |
701 | len = (VDC_TX_RING_SIZE * entry_size); | |
702 | ||
703 | ncookies = VIO_MAX_RING_COOKIES; | |
704 | dring = ldc_alloc_exp_dring(port->vio.lp, len, | |
705 | dr->cookies, &ncookies, | |
706 | (LDC_MAP_SHADOW | | |
707 | LDC_MAP_DIRECT | | |
708 | LDC_MAP_RW)); | |
709 | if (IS_ERR(dring)) | |
710 | return PTR_ERR(dring); | |
711 | ||
712 | dr->base = dring; | |
713 | dr->entry_size = entry_size; | |
714 | dr->num_entries = VDC_TX_RING_SIZE; | |
715 | dr->prod = dr->cons = 0; | |
716 | dr->pending = VDC_TX_RING_SIZE; | |
717 | dr->ncookies = ncookies; | |
718 | ||
719 | return 0; | |
720 | } | |
721 | ||
722 | static void vdc_free_tx_ring(struct vdc_port *port) | |
723 | { | |
724 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
725 | ||
726 | if (dr->base) { | |
727 | ldc_free_exp_dring(port->vio.lp, dr->base, | |
728 | (dr->entry_size * dr->num_entries), | |
729 | dr->cookies, dr->ncookies); | |
730 | dr->base = NULL; | |
731 | dr->entry_size = 0; | |
732 | dr->num_entries = 0; | |
733 | dr->pending = 0; | |
734 | dr->ncookies = 0; | |
735 | } | |
736 | } | |
737 | ||
76e74bbe | 738 | static int vdc_port_up(struct vdc_port *port) |
667ef3c3 DM |
739 | { |
740 | struct vio_completion comp; | |
667ef3c3 DM |
741 | |
742 | init_completion(&comp.com); | |
743 | comp.err = 0; | |
744 | comp.waiting_for = WAITING_FOR_LINK_UP; | |
745 | port->vio.cmp = ∁ | |
746 | ||
747 | vio_port_up(&port->vio); | |
667ef3c3 | 748 | wait_for_completion(&comp.com); |
76e74bbe DE |
749 | return comp.err; |
750 | } | |
751 | ||
752 | static void vdc_port_down(struct vdc_port *port) | |
753 | { | |
754 | ldc_disconnect(port->vio.lp); | |
755 | ldc_unbind(port->vio.lp); | |
756 | vdc_free_tx_ring(port); | |
757 | vio_ldc_free(&port->vio); | |
758 | } | |
759 | ||
760 | static int probe_disk(struct vdc_port *port) | |
761 | { | |
762 | struct request_queue *q; | |
763 | struct gendisk *g; | |
764 | int err; | |
765 | ||
766 | err = vdc_port_up(port); | |
767 | if (err) | |
768 | return err; | |
667ef3c3 | 769 | |
f41e5461 LH |
770 | /* Using version 1.2 means vdisk_phys_blksz should be set unless the |
771 | * disk is reserved by another system. | |
772 | */ | |
773 | if (vdc_version_supported(port, 1, 2) && !port->vdisk_phys_blksz) | |
774 | return -ENODEV; | |
775 | ||
9bce2182 AP |
776 | if (vdc_version_supported(port, 1, 1)) { |
777 | /* vdisk_size should be set during the handshake, if it wasn't | |
778 | * then the underlying disk is reserved by another system | |
779 | */ | |
780 | if (port->vdisk_size == -1) | |
781 | return -ENODEV; | |
782 | } else { | |
de5b73f0 AP |
783 | struct vio_disk_geom geom; |
784 | ||
9bce2182 | 785 | err = generic_request(port, VD_OP_GET_DISKGEOM, |
de5b73f0 | 786 | &geom, sizeof(geom)); |
9bce2182 AP |
787 | if (err < 0) { |
788 | printk(KERN_ERR PFX "VD_OP_GET_DISKGEOM returns " | |
789 | "error %d\n", err); | |
790 | return err; | |
791 | } | |
de5b73f0 AP |
792 | port->vdisk_size = ((u64)geom.num_cyl * |
793 | (u64)geom.num_hd * | |
794 | (u64)geom.num_sec); | |
667ef3c3 DM |
795 | } |
796 | ||
667ef3c3 DM |
797 | q = blk_init_queue(do_vdc_request, &port->vio.lock); |
798 | if (!q) { | |
799 | printk(KERN_ERR PFX "%s: Could not allocate queue.\n", | |
800 | port->vio.name); | |
801 | return -ENOMEM; | |
802 | } | |
803 | g = alloc_disk(1 << PARTITION_SHIFT); | |
804 | if (!g) { | |
805 | printk(KERN_ERR PFX "%s: Could not allocate gendisk.\n", | |
806 | port->vio.name); | |
807 | blk_cleanup_queue(q); | |
808 | return -ENOMEM; | |
809 | } | |
810 | ||
811 | port->disk = g; | |
812 | ||
5eed69ff DE |
813 | /* Each segment in a request is up to an aligned page in size. */ |
814 | blk_queue_segment_boundary(q, PAGE_SIZE - 1); | |
815 | blk_queue_max_segment_size(q, PAGE_SIZE); | |
816 | ||
8a78362c | 817 | blk_queue_max_segments(q, port->ring_cookies); |
086fa5ff | 818 | blk_queue_max_hw_sectors(q, port->max_xfer_size); |
667ef3c3 | 819 | g->major = vdc_major; |
91ba3c21 | 820 | g->first_minor = port->vio.vdev->dev_no << PARTITION_SHIFT; |
667ef3c3 DM |
821 | strcpy(g->disk_name, port->disk_name); |
822 | ||
823 | g->fops = &vdc_fops; | |
824 | g->queue = q; | |
825 | g->private_data = port; | |
667ef3c3 DM |
826 | |
827 | set_capacity(g, port->vdisk_size); | |
828 | ||
9bce2182 AP |
829 | if (vdc_version_supported(port, 1, 1)) { |
830 | switch (port->vdisk_mtype) { | |
831 | case VD_MEDIA_TYPE_CD: | |
832 | pr_info(PFX "Virtual CDROM %s\n", port->disk_name); | |
833 | g->flags |= GENHD_FL_CD; | |
834 | g->flags |= GENHD_FL_REMOVABLE; | |
835 | set_disk_ro(g, 1); | |
836 | break; | |
837 | ||
838 | case VD_MEDIA_TYPE_DVD: | |
839 | pr_info(PFX "Virtual DVD %s\n", port->disk_name); | |
840 | g->flags |= GENHD_FL_CD; | |
841 | g->flags |= GENHD_FL_REMOVABLE; | |
842 | set_disk_ro(g, 1); | |
843 | break; | |
844 | ||
845 | case VD_MEDIA_TYPE_FIXED: | |
846 | pr_info(PFX "Virtual Hard disk %s\n", port->disk_name); | |
847 | break; | |
848 | } | |
849 | } | |
850 | ||
f41e5461 LH |
851 | blk_queue_physical_block_size(q, port->vdisk_phys_blksz); |
852 | ||
9bce2182 | 853 | pr_info(PFX "%s: %u sectors (%u MB) protocol %d.%d\n", |
667ef3c3 | 854 | g->disk_name, |
9bce2182 AP |
855 | port->vdisk_size, (port->vdisk_size >> (20 - 9)), |
856 | port->vio.ver.major, port->vio.ver.minor); | |
667ef3c3 | 857 | |
0d52c756 | 858 | device_add_disk(&port->vio.vdev->dev, g); |
667ef3c3 DM |
859 | |
860 | return 0; | |
861 | } | |
862 | ||
863 | static struct ldc_channel_config vdc_ldc_cfg = { | |
864 | .event = vdc_event, | |
865 | .mtu = 64, | |
866 | .mode = LDC_MODE_UNRELIABLE, | |
867 | }; | |
868 | ||
869 | static struct vio_driver_ops vdc_vio_ops = { | |
870 | .send_attr = vdc_send_attr, | |
871 | .handle_attr = vdc_handle_attr, | |
872 | .handshake_complete = vdc_handshake_complete, | |
873 | }; | |
874 | ||
8d85fce7 | 875 | static void print_version(void) |
80dc35df DM |
876 | { |
877 | static int version_printed; | |
878 | ||
879 | if (version_printed++ == 0) | |
880 | printk(KERN_INFO "%s", version); | |
881 | } | |
882 | ||
3ee70591 JQ |
883 | struct vdc_check_port_data { |
884 | int dev_no; | |
885 | char *type; | |
886 | }; | |
887 | ||
888 | static int vdc_device_probed(struct device *dev, void *arg) | |
889 | { | |
890 | struct vio_dev *vdev = to_vio_dev(dev); | |
891 | struct vdc_check_port_data *port_data; | |
892 | ||
893 | port_data = (struct vdc_check_port_data *)arg; | |
894 | ||
895 | if ((vdev->dev_no == port_data->dev_no) && | |
896 | (!(strcmp((char *)&vdev->type, port_data->type))) && | |
897 | dev_get_drvdata(dev)) { | |
898 | /* This device has already been configured | |
899 | * by vdc_port_probe() | |
900 | */ | |
901 | return 1; | |
902 | } else { | |
903 | return 0; | |
904 | } | |
905 | } | |
906 | ||
907 | /* Determine whether the VIO device is part of an mpgroup | |
908 | * by locating all the virtual-device-port nodes associated | |
909 | * with the parent virtual-device node for the VIO device | |
910 | * and checking whether any of these nodes are vdc-ports | |
911 | * which have already been configured. | |
912 | * | |
913 | * Returns true if this device is part of an mpgroup and has | |
914 | * already been probed. | |
915 | */ | |
916 | static bool vdc_port_mpgroup_check(struct vio_dev *vdev) | |
917 | { | |
918 | struct vdc_check_port_data port_data; | |
919 | struct device *dev; | |
920 | ||
921 | port_data.dev_no = vdev->dev_no; | |
922 | port_data.type = (char *)&vdev->type; | |
923 | ||
924 | dev = device_find_child(vdev->dev.parent, &port_data, | |
925 | vdc_device_probed); | |
926 | ||
927 | if (dev) | |
928 | return true; | |
929 | ||
930 | return false; | |
931 | } | |
932 | ||
8d85fce7 | 933 | static int vdc_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) |
667ef3c3 | 934 | { |
43fdf274 | 935 | struct mdesc_handle *hp; |
667ef3c3 | 936 | struct vdc_port *port; |
667ef3c3 | 937 | int err; |
76e74bbe | 938 | const u64 *ldc_timeout; |
667ef3c3 | 939 | |
80dc35df | 940 | print_version(); |
667ef3c3 | 941 | |
43fdf274 | 942 | hp = mdesc_grab(); |
667ef3c3 | 943 | |
43fdf274 | 944 | err = -ENODEV; |
91ba3c21 | 945 | if ((vdev->dev_no << PARTITION_SHIFT) & ~(u64)MINORMASK) { |
3f4528d6 | 946 | printk(KERN_ERR PFX "Port id [%llu] too large.\n", |
91ba3c21 | 947 | vdev->dev_no); |
43fdf274 | 948 | goto err_out_release_mdesc; |
667ef3c3 DM |
949 | } |
950 | ||
3ee70591 JQ |
951 | /* Check if this device is part of an mpgroup */ |
952 | if (vdc_port_mpgroup_check(vdev)) { | |
953 | printk(KERN_WARNING | |
954 | "VIO: Ignoring extra vdisk port %s", | |
955 | dev_name(&vdev->dev)); | |
956 | goto err_out_release_mdesc; | |
957 | } | |
958 | ||
667ef3c3 | 959 | port = kzalloc(sizeof(*port), GFP_KERNEL); |
43fdf274 | 960 | err = -ENOMEM; |
667ef3c3 DM |
961 | if (!port) { |
962 | printk(KERN_ERR PFX "Cannot allocate vdc_port.\n"); | |
43fdf274 | 963 | goto err_out_release_mdesc; |
667ef3c3 DM |
964 | } |
965 | ||
91ba3c21 | 966 | if (vdev->dev_no >= 26) |
667ef3c3 DM |
967 | snprintf(port->disk_name, sizeof(port->disk_name), |
968 | VDCBLK_NAME "%c%c", | |
91ba3c21 DM |
969 | 'a' + ((int)vdev->dev_no / 26) - 1, |
970 | 'a' + ((int)vdev->dev_no % 26)); | |
667ef3c3 DM |
971 | else |
972 | snprintf(port->disk_name, sizeof(port->disk_name), | |
91ba3c21 | 973 | VDCBLK_NAME "%c", 'a' + ((int)vdev->dev_no % 26)); |
9bce2182 | 974 | port->vdisk_size = -1; |
667ef3c3 | 975 | |
76e74bbe DE |
976 | /* Actual wall time may be double due to do_generic_file_read() doing |
977 | * a readahead I/O first, and once that fails it will try to read a | |
978 | * single page. | |
979 | */ | |
980 | ldc_timeout = mdesc_get_property(hp, vdev->mp, "vdc-timeout", NULL); | |
981 | port->ldc_timeout = ldc_timeout ? *ldc_timeout : 0; | |
e99e88a9 | 982 | timer_setup(&port->ldc_reset_timer, vdc_ldc_reset_timer, 0); |
76e74bbe DE |
983 | INIT_WORK(&port->ldc_reset_work, vdc_ldc_reset_work); |
984 | ||
43fdf274 | 985 | err = vio_driver_init(&port->vio, vdev, VDEV_DISK, |
667ef3c3 DM |
986 | vdc_versions, ARRAY_SIZE(vdc_versions), |
987 | &vdc_vio_ops, port->disk_name); | |
988 | if (err) | |
989 | goto err_out_free_port; | |
990 | ||
f41e5461 | 991 | port->vdisk_block_size = VDC_DEFAULT_BLK_SIZE; |
667ef3c3 DM |
992 | port->max_xfer_size = ((128 * 1024) / port->vdisk_block_size); |
993 | port->ring_cookies = ((port->max_xfer_size * | |
994 | port->vdisk_block_size) / PAGE_SIZE) + 2; | |
995 | ||
996 | err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port); | |
997 | if (err) | |
998 | goto err_out_free_port; | |
999 | ||
1000 | err = vdc_alloc_tx_ring(port); | |
1001 | if (err) | |
1002 | goto err_out_free_ldc; | |
1003 | ||
1004 | err = probe_disk(port); | |
1005 | if (err) | |
1006 | goto err_out_free_tx_ring; | |
1007 | ||
3ee70591 JQ |
1008 | /* Note that the device driver_data is used to determine |
1009 | * whether the port has been probed. | |
1010 | */ | |
667ef3c3 DM |
1011 | dev_set_drvdata(&vdev->dev, port); |
1012 | ||
43fdf274 DM |
1013 | mdesc_release(hp); |
1014 | ||
667ef3c3 DM |
1015 | return 0; |
1016 | ||
1017 | err_out_free_tx_ring: | |
1018 | vdc_free_tx_ring(port); | |
1019 | ||
1020 | err_out_free_ldc: | |
1021 | vio_ldc_free(&port->vio); | |
1022 | ||
1023 | err_out_free_port: | |
1024 | kfree(port); | |
1025 | ||
43fdf274 DM |
1026 | err_out_release_mdesc: |
1027 | mdesc_release(hp); | |
667ef3c3 DM |
1028 | return err; |
1029 | } | |
1030 | ||
1031 | static int vdc_port_remove(struct vio_dev *vdev) | |
1032 | { | |
1033 | struct vdc_port *port = dev_get_drvdata(&vdev->dev); | |
1034 | ||
1035 | if (port) { | |
31f4888f DE |
1036 | unsigned long flags; |
1037 | ||
1038 | spin_lock_irqsave(&port->vio.lock, flags); | |
1039 | blk_stop_queue(port->disk->queue); | |
1040 | spin_unlock_irqrestore(&port->vio.lock, flags); | |
1041 | ||
76e74bbe DE |
1042 | flush_work(&port->ldc_reset_work); |
1043 | del_timer_sync(&port->ldc_reset_timer); | |
667ef3c3 DM |
1044 | del_timer_sync(&port->vio.timer); |
1045 | ||
31f4888f DE |
1046 | del_gendisk(port->disk); |
1047 | blk_cleanup_queue(port->disk->queue); | |
1048 | put_disk(port->disk); | |
1049 | port->disk = NULL; | |
1050 | ||
667ef3c3 DM |
1051 | vdc_free_tx_ring(port); |
1052 | vio_ldc_free(&port->vio); | |
1053 | ||
1054 | dev_set_drvdata(&vdev->dev, NULL); | |
1055 | ||
1056 | kfree(port); | |
1057 | } | |
1058 | return 0; | |
1059 | } | |
1060 | ||
76e74bbe DE |
1061 | static void vdc_requeue_inflight(struct vdc_port *port) |
1062 | { | |
1063 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
1064 | u32 idx; | |
1065 | ||
1066 | for (idx = dr->cons; idx != dr->prod; idx = vio_dring_next(dr, idx)) { | |
1067 | struct vio_disk_desc *desc = vio_dring_entry(dr, idx); | |
1068 | struct vdc_req_entry *rqe = &port->rq_arr[idx]; | |
1069 | struct request *req; | |
1070 | ||
1071 | ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies); | |
1072 | desc->hdr.state = VIO_DESC_FREE; | |
1073 | dr->cons = vio_dring_next(dr, idx); | |
1074 | ||
1075 | req = rqe->req; | |
1076 | if (req == NULL) { | |
1077 | vdc_end_special(port, desc); | |
1078 | continue; | |
1079 | } | |
1080 | ||
1081 | rqe->req = NULL; | |
1082 | blk_requeue_request(port->disk->queue, req); | |
1083 | } | |
1084 | } | |
1085 | ||
1086 | static void vdc_queue_drain(struct vdc_port *port) | |
1087 | { | |
1088 | struct request *req; | |
1089 | ||
1090 | while ((req = blk_fetch_request(port->disk->queue)) != NULL) | |
2a842aca | 1091 | __blk_end_request_all(req, BLK_STS_IOERR); |
76e74bbe DE |
1092 | } |
1093 | ||
e99e88a9 | 1094 | static void vdc_ldc_reset_timer(struct timer_list *t) |
76e74bbe | 1095 | { |
e99e88a9 | 1096 | struct vdc_port *port = from_timer(port, t, ldc_reset_timer); |
76e74bbe DE |
1097 | struct vio_driver_state *vio = &port->vio; |
1098 | unsigned long flags; | |
1099 | ||
1100 | spin_lock_irqsave(&vio->lock, flags); | |
1101 | if (!(port->vio.hs_state & VIO_HS_COMPLETE)) { | |
1102 | pr_warn(PFX "%s ldc down %llu seconds, draining queue\n", | |
1103 | port->disk_name, port->ldc_timeout); | |
1104 | vdc_queue_drain(port); | |
1105 | vdc_blk_queue_start(port); | |
1106 | } | |
1107 | spin_unlock_irqrestore(&vio->lock, flags); | |
1108 | } | |
1109 | ||
1110 | static void vdc_ldc_reset_work(struct work_struct *work) | |
1111 | { | |
1112 | struct vdc_port *port; | |
1113 | struct vio_driver_state *vio; | |
1114 | unsigned long flags; | |
1115 | ||
1116 | port = container_of(work, struct vdc_port, ldc_reset_work); | |
1117 | vio = &port->vio; | |
1118 | ||
1119 | spin_lock_irqsave(&vio->lock, flags); | |
1120 | vdc_ldc_reset(port); | |
1121 | spin_unlock_irqrestore(&vio->lock, flags); | |
1122 | } | |
1123 | ||
1124 | static void vdc_ldc_reset(struct vdc_port *port) | |
1125 | { | |
1126 | int err; | |
1127 | ||
1128 | assert_spin_locked(&port->vio.lock); | |
1129 | ||
1130 | pr_warn(PFX "%s ldc link reset\n", port->disk_name); | |
1131 | blk_stop_queue(port->disk->queue); | |
1132 | vdc_requeue_inflight(port); | |
1133 | vdc_port_down(port); | |
1134 | ||
1135 | err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port); | |
1136 | if (err) { | |
1137 | pr_err(PFX "%s vio_ldc_alloc:%d\n", port->disk_name, err); | |
1138 | return; | |
1139 | } | |
1140 | ||
1141 | err = vdc_alloc_tx_ring(port); | |
1142 | if (err) { | |
1143 | pr_err(PFX "%s vio_alloc_tx_ring:%d\n", port->disk_name, err); | |
1144 | goto err_free_ldc; | |
1145 | } | |
1146 | ||
1147 | if (port->ldc_timeout) | |
1148 | mod_timer(&port->ldc_reset_timer, | |
1149 | round_jiffies(jiffies + HZ * port->ldc_timeout)); | |
1150 | mod_timer(&port->vio.timer, round_jiffies(jiffies + HZ)); | |
1151 | return; | |
1152 | ||
1153 | err_free_ldc: | |
1154 | vio_ldc_free(&port->vio); | |
1155 | } | |
1156 | ||
3d452e55 | 1157 | static const struct vio_device_id vdc_port_match[] = { |
667ef3c3 DM |
1158 | { |
1159 | .type = "vdc-port", | |
1160 | }, | |
1161 | {}, | |
1162 | }; | |
da68e081 | 1163 | MODULE_DEVICE_TABLE(vio, vdc_port_match); |
667ef3c3 DM |
1164 | |
1165 | static struct vio_driver vdc_port_driver = { | |
1166 | .id_table = vdc_port_match, | |
1167 | .probe = vdc_port_probe, | |
1168 | .remove = vdc_port_remove, | |
cb52d897 | 1169 | .name = "vdc_port", |
667ef3c3 DM |
1170 | }; |
1171 | ||
667ef3c3 DM |
1172 | static int __init vdc_init(void) |
1173 | { | |
1174 | int err; | |
1175 | ||
76e74bbe DE |
1176 | sunvdc_wq = alloc_workqueue("sunvdc", 0, 0); |
1177 | if (!sunvdc_wq) | |
1178 | return -ENOMEM; | |
1179 | ||
667ef3c3 DM |
1180 | err = register_blkdev(0, VDCBLK_NAME); |
1181 | if (err < 0) | |
76e74bbe | 1182 | goto out_free_wq; |
667ef3c3 DM |
1183 | |
1184 | vdc_major = err; | |
667ef3c3 DM |
1185 | |
1186 | err = vio_register_driver(&vdc_port_driver); | |
1187 | if (err) | |
80dc35df | 1188 | goto out_unregister_blkdev; |
667ef3c3 DM |
1189 | |
1190 | return 0; | |
1191 | ||
667ef3c3 DM |
1192 | out_unregister_blkdev: |
1193 | unregister_blkdev(vdc_major, VDCBLK_NAME); | |
1194 | vdc_major = 0; | |
1195 | ||
76e74bbe DE |
1196 | out_free_wq: |
1197 | destroy_workqueue(sunvdc_wq); | |
667ef3c3 DM |
1198 | return err; |
1199 | } | |
1200 | ||
1201 | static void __exit vdc_exit(void) | |
1202 | { | |
1203 | vio_unregister_driver(&vdc_port_driver); | |
667ef3c3 | 1204 | unregister_blkdev(vdc_major, VDCBLK_NAME); |
76e74bbe | 1205 | destroy_workqueue(sunvdc_wq); |
667ef3c3 DM |
1206 | } |
1207 | ||
1208 | module_init(vdc_init); | |
1209 | module_exit(vdc_exit); |