]>
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 | 38 | |
ff5d1a42 KC |
39 | #define MAX_XFER_BLKS (128 * 1024) |
40 | #define MAX_XFER_SIZE (MAX_XFER_BLKS / VDC_DEFAULT_BLK_SIZE) | |
41 | #define MAX_RING_COOKIES ((MAX_XFER_BLKS / PAGE_SIZE) + 2) | |
42 | ||
667ef3c3 DM |
43 | #define WAITING_FOR_LINK_UP 0x01 |
44 | #define WAITING_FOR_TX_SPACE 0x02 | |
45 | #define WAITING_FOR_GEN_CMD 0x04 | |
46 | #define WAITING_FOR_ANY -1 | |
47 | ||
76e74bbe DE |
48 | static struct workqueue_struct *sunvdc_wq; |
49 | ||
667ef3c3 DM |
50 | struct vdc_req_entry { |
51 | struct request *req; | |
52 | }; | |
53 | ||
54 | struct vdc_port { | |
55 | struct vio_driver_state vio; | |
56 | ||
667ef3c3 DM |
57 | struct gendisk *disk; |
58 | ||
59 | struct vdc_completion *cmp; | |
60 | ||
61 | u64 req_id; | |
62 | u64 seq; | |
63 | struct vdc_req_entry rq_arr[VDC_TX_RING_SIZE]; | |
64 | ||
65 | unsigned long ring_cookies; | |
66 | ||
67 | u64 max_xfer_size; | |
68 | u32 vdisk_block_size; | |
69 | ||
76e74bbe DE |
70 | u64 ldc_timeout; |
71 | struct timer_list ldc_reset_timer; | |
72 | struct work_struct ldc_reset_work; | |
73 | ||
667ef3c3 DM |
74 | /* The server fills these in for us in the disk attribute |
75 | * ACK packet. | |
76 | */ | |
77 | u64 operations; | |
78 | u32 vdisk_size; | |
79 | u8 vdisk_type; | |
9bce2182 | 80 | u8 vdisk_mtype; |
f41e5461 | 81 | u32 vdisk_phys_blksz; |
667ef3c3 DM |
82 | |
83 | char disk_name[32]; | |
667ef3c3 DM |
84 | }; |
85 | ||
76e74bbe DE |
86 | static void vdc_ldc_reset(struct vdc_port *port); |
87 | static void vdc_ldc_reset_work(struct work_struct *work); | |
e99e88a9 | 88 | static void vdc_ldc_reset_timer(struct timer_list *t); |
76e74bbe | 89 | |
667ef3c3 DM |
90 | static inline struct vdc_port *to_vdc_port(struct vio_driver_state *vio) |
91 | { | |
92 | return container_of(vio, struct vdc_port, vio); | |
93 | } | |
94 | ||
667ef3c3 DM |
95 | /* Ordered from largest major to lowest */ |
96 | static struct vio_version vdc_versions[] = { | |
f41e5461 | 97 | { .major = 1, .minor = 2 }, |
9bce2182 | 98 | { .major = 1, .minor = 1 }, |
667ef3c3 DM |
99 | { .major = 1, .minor = 0 }, |
100 | }; | |
101 | ||
9bce2182 AP |
102 | static inline int vdc_version_supported(struct vdc_port *port, |
103 | u16 major, u16 minor) | |
104 | { | |
105 | return port->vio.ver.major == major && port->vio.ver.minor >= minor; | |
106 | } | |
107 | ||
667ef3c3 DM |
108 | #define VDCBLK_NAME "vdisk" |
109 | static int vdc_major; | |
110 | #define PARTITION_SHIFT 3 | |
111 | ||
112 | static inline u32 vdc_tx_dring_avail(struct vio_dring_state *dr) | |
113 | { | |
114 | return vio_dring_avail(dr, VDC_TX_RING_SIZE); | |
115 | } | |
116 | ||
117 | static int vdc_getgeo(struct block_device *bdev, struct hd_geometry *geo) | |
118 | { | |
119 | struct gendisk *disk = bdev->bd_disk; | |
de5b73f0 AP |
120 | sector_t nsect = get_capacity(disk); |
121 | sector_t cylinders = nsect; | |
667ef3c3 | 122 | |
de5b73f0 AP |
123 | geo->heads = 0xff; |
124 | geo->sectors = 0x3f; | |
125 | sector_div(cylinders, geo->heads * geo->sectors); | |
126 | geo->cylinders = cylinders; | |
127 | if ((sector_t)(geo->cylinders + 1) * geo->heads * geo->sectors < nsect) | |
128 | geo->cylinders = 0xffff; | |
667ef3c3 DM |
129 | |
130 | return 0; | |
131 | } | |
132 | ||
9bce2182 AP |
133 | /* Add ioctl/CDROM_GET_CAPABILITY to support cdrom_id in udev |
134 | * when vdisk_mtype is VD_MEDIA_TYPE_CD or VD_MEDIA_TYPE_DVD. | |
135 | * Needed to be able to install inside an ldom from an iso image. | |
136 | */ | |
137 | static int vdc_ioctl(struct block_device *bdev, fmode_t mode, | |
138 | unsigned command, unsigned long argument) | |
139 | { | |
140 | int i; | |
141 | struct gendisk *disk; | |
142 | ||
143 | switch (command) { | |
144 | case CDROMMULTISESSION: | |
145 | pr_debug(PFX "Multisession CDs not supported\n"); | |
146 | for (i = 0; i < sizeof(struct cdrom_multisession); i++) | |
147 | if (put_user(0, (char __user *)(argument + i))) | |
148 | return -EFAULT; | |
149 | return 0; | |
150 | ||
151 | case CDROM_GET_CAPABILITY: | |
152 | disk = bdev->bd_disk; | |
153 | ||
154 | if (bdev->bd_disk && (disk->flags & GENHD_FL_CD)) | |
155 | return 0; | |
156 | return -EINVAL; | |
157 | ||
158 | default: | |
159 | pr_debug(PFX "ioctl %08x not supported\n", command); | |
160 | return -EINVAL; | |
161 | } | |
162 | } | |
163 | ||
83d5cde4 | 164 | static const struct block_device_operations vdc_fops = { |
667ef3c3 DM |
165 | .owner = THIS_MODULE, |
166 | .getgeo = vdc_getgeo, | |
9bce2182 | 167 | .ioctl = vdc_ioctl, |
667ef3c3 DM |
168 | }; |
169 | ||
76e74bbe DE |
170 | static void vdc_blk_queue_start(struct vdc_port *port) |
171 | { | |
172 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
173 | ||
174 | /* restart blk queue when ring is half emptied. also called after | |
175 | * handshake completes, so check for initial handshake before we've | |
176 | * allocated a disk. | |
177 | */ | |
178 | if (port->disk && blk_queue_stopped(port->disk->queue) && | |
179 | vdc_tx_dring_avail(dr) * 100 / VDC_TX_RING_SIZE >= 50) { | |
180 | blk_start_queue(port->disk->queue); | |
181 | } | |
182 | ||
183 | } | |
184 | ||
667ef3c3 DM |
185 | static void vdc_finish(struct vio_driver_state *vio, int err, int waiting_for) |
186 | { | |
187 | if (vio->cmp && | |
188 | (waiting_for == -1 || | |
189 | vio->cmp->waiting_for == waiting_for)) { | |
190 | vio->cmp->err = err; | |
191 | complete(&vio->cmp->com); | |
192 | vio->cmp = NULL; | |
193 | } | |
194 | } | |
195 | ||
196 | static void vdc_handshake_complete(struct vio_driver_state *vio) | |
197 | { | |
76e74bbe DE |
198 | struct vdc_port *port = to_vdc_port(vio); |
199 | ||
200 | del_timer(&port->ldc_reset_timer); | |
667ef3c3 | 201 | vdc_finish(vio, 0, WAITING_FOR_LINK_UP); |
76e74bbe | 202 | vdc_blk_queue_start(port); |
667ef3c3 DM |
203 | } |
204 | ||
205 | static int vdc_handle_unknown(struct vdc_port *port, void *arg) | |
206 | { | |
207 | struct vio_msg_tag *pkt = arg; | |
208 | ||
209 | printk(KERN_ERR PFX "Received unknown msg [%02x:%02x:%04x:%08x]\n", | |
210 | pkt->type, pkt->stype, pkt->stype_env, pkt->sid); | |
211 | printk(KERN_ERR PFX "Resetting connection.\n"); | |
212 | ||
213 | ldc_disconnect(port->vio.lp); | |
214 | ||
215 | return -ECONNRESET; | |
216 | } | |
217 | ||
218 | static int vdc_send_attr(struct vio_driver_state *vio) | |
219 | { | |
220 | struct vdc_port *port = to_vdc_port(vio); | |
221 | struct vio_disk_attr_info pkt; | |
222 | ||
223 | memset(&pkt, 0, sizeof(pkt)); | |
224 | ||
225 | pkt.tag.type = VIO_TYPE_CTRL; | |
226 | pkt.tag.stype = VIO_SUBTYPE_INFO; | |
227 | pkt.tag.stype_env = VIO_ATTR_INFO; | |
228 | pkt.tag.sid = vio_send_sid(vio); | |
229 | ||
230 | pkt.xfer_mode = VIO_DRING_MODE; | |
231 | pkt.vdisk_block_size = port->vdisk_block_size; | |
232 | pkt.max_xfer_size = port->max_xfer_size; | |
233 | ||
3f4528d6 | 234 | viodbg(HS, "SEND ATTR xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n", |
667ef3c3 DM |
235 | pkt.xfer_mode, pkt.vdisk_block_size, pkt.max_xfer_size); |
236 | ||
237 | return vio_ldc_send(&port->vio, &pkt, sizeof(pkt)); | |
238 | } | |
239 | ||
240 | static int vdc_handle_attr(struct vio_driver_state *vio, void *arg) | |
241 | { | |
242 | struct vdc_port *port = to_vdc_port(vio); | |
243 | struct vio_disk_attr_info *pkt = arg; | |
244 | ||
3f4528d6 | 245 | viodbg(HS, "GOT ATTR stype[0x%x] ops[%llx] disk_size[%llu] disk_type[%x] " |
9bce2182 | 246 | "mtype[0x%x] xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n", |
667ef3c3 | 247 | pkt->tag.stype, pkt->operations, |
9bce2182 | 248 | pkt->vdisk_size, pkt->vdisk_type, pkt->vdisk_mtype, |
667ef3c3 DM |
249 | pkt->xfer_mode, pkt->vdisk_block_size, |
250 | pkt->max_xfer_size); | |
251 | ||
252 | if (pkt->tag.stype == VIO_SUBTYPE_ACK) { | |
253 | switch (pkt->vdisk_type) { | |
254 | case VD_DISK_TYPE_DISK: | |
255 | case VD_DISK_TYPE_SLICE: | |
256 | break; | |
257 | ||
258 | default: | |
259 | printk(KERN_ERR PFX "%s: Bogus vdisk_type 0x%x\n", | |
260 | vio->name, pkt->vdisk_type); | |
261 | return -ECONNRESET; | |
262 | } | |
263 | ||
264 | if (pkt->vdisk_block_size > port->vdisk_block_size) { | |
265 | printk(KERN_ERR PFX "%s: BLOCK size increased " | |
266 | "%u --> %u\n", | |
267 | vio->name, | |
268 | port->vdisk_block_size, pkt->vdisk_block_size); | |
269 | return -ECONNRESET; | |
270 | } | |
271 | ||
272 | port->operations = pkt->operations; | |
667ef3c3 | 273 | port->vdisk_type = pkt->vdisk_type; |
9bce2182 AP |
274 | if (vdc_version_supported(port, 1, 1)) { |
275 | port->vdisk_size = pkt->vdisk_size; | |
276 | port->vdisk_mtype = pkt->vdisk_mtype; | |
277 | } | |
667ef3c3 DM |
278 | if (pkt->max_xfer_size < port->max_xfer_size) |
279 | port->max_xfer_size = pkt->max_xfer_size; | |
280 | port->vdisk_block_size = pkt->vdisk_block_size; | |
f41e5461 LH |
281 | |
282 | port->vdisk_phys_blksz = VDC_DEFAULT_BLK_SIZE; | |
283 | if (vdc_version_supported(port, 1, 2)) | |
284 | port->vdisk_phys_blksz = pkt->phys_block_size; | |
285 | ||
667ef3c3 DM |
286 | return 0; |
287 | } else { | |
288 | printk(KERN_ERR PFX "%s: Attribute NACK\n", vio->name); | |
289 | ||
290 | return -ECONNRESET; | |
291 | } | |
292 | } | |
293 | ||
294 | static void vdc_end_special(struct vdc_port *port, struct vio_disk_desc *desc) | |
295 | { | |
296 | int err = desc->status; | |
297 | ||
298 | vdc_finish(&port->vio, -err, WAITING_FOR_GEN_CMD); | |
299 | } | |
300 | ||
667ef3c3 DM |
301 | static void vdc_end_one(struct vdc_port *port, struct vio_dring_state *dr, |
302 | unsigned int index) | |
303 | { | |
304 | struct vio_disk_desc *desc = vio_dring_entry(dr, index); | |
305 | struct vdc_req_entry *rqe = &port->rq_arr[index]; | |
306 | struct request *req; | |
307 | ||
308 | if (unlikely(desc->hdr.state != VIO_DESC_DONE)) | |
309 | return; | |
310 | ||
311 | ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies); | |
312 | desc->hdr.state = VIO_DESC_FREE; | |
fe47c3c2 | 313 | dr->cons = vio_dring_next(dr, index); |
667ef3c3 DM |
314 | |
315 | req = rqe->req; | |
316 | if (req == NULL) { | |
317 | vdc_end_special(port, desc); | |
318 | return; | |
319 | } | |
320 | ||
321 | rqe->req = NULL; | |
322 | ||
2a842aca | 323 | __blk_end_request(req, (desc->status ? BLK_STS_IOERR : 0), desc->size); |
667ef3c3 | 324 | |
76e74bbe | 325 | vdc_blk_queue_start(port); |
667ef3c3 DM |
326 | } |
327 | ||
328 | static int vdc_ack(struct vdc_port *port, void *msgbuf) | |
329 | { | |
330 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
331 | struct vio_dring_data *pkt = msgbuf; | |
332 | ||
333 | if (unlikely(pkt->dring_ident != dr->ident || | |
334 | pkt->start_idx != pkt->end_idx || | |
335 | pkt->start_idx >= VDC_TX_RING_SIZE)) | |
336 | return 0; | |
337 | ||
338 | vdc_end_one(port, dr, pkt->start_idx); | |
339 | ||
340 | return 0; | |
341 | } | |
342 | ||
343 | static int vdc_nack(struct vdc_port *port, void *msgbuf) | |
344 | { | |
345 | /* XXX Implement me XXX */ | |
346 | return 0; | |
347 | } | |
348 | ||
349 | static void vdc_event(void *arg, int event) | |
350 | { | |
351 | struct vdc_port *port = arg; | |
352 | struct vio_driver_state *vio = &port->vio; | |
353 | unsigned long flags; | |
354 | int err; | |
355 | ||
356 | spin_lock_irqsave(&vio->lock, flags); | |
357 | ||
76e74bbe | 358 | if (unlikely(event == LDC_EVENT_RESET)) { |
667ef3c3 | 359 | vio_link_state_change(vio, event); |
76e74bbe DE |
360 | queue_work(sunvdc_wq, &port->ldc_reset_work); |
361 | goto out; | |
362 | } | |
363 | ||
364 | if (unlikely(event == LDC_EVENT_UP)) { | |
365 | vio_link_state_change(vio, event); | |
366 | goto out; | |
667ef3c3 DM |
367 | } |
368 | ||
369 | if (unlikely(event != LDC_EVENT_DATA_READY)) { | |
76e74bbe DE |
370 | pr_warn(PFX "Unexpected LDC event %d\n", event); |
371 | goto out; | |
667ef3c3 DM |
372 | } |
373 | ||
374 | err = 0; | |
375 | while (1) { | |
376 | union { | |
377 | struct vio_msg_tag tag; | |
378 | u64 raw[8]; | |
379 | } msgbuf; | |
380 | ||
381 | err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf)); | |
382 | if (unlikely(err < 0)) { | |
383 | if (err == -ECONNRESET) | |
384 | vio_conn_reset(vio); | |
385 | break; | |
386 | } | |
387 | if (err == 0) | |
388 | break; | |
389 | viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n", | |
390 | msgbuf.tag.type, | |
391 | msgbuf.tag.stype, | |
392 | msgbuf.tag.stype_env, | |
393 | msgbuf.tag.sid); | |
394 | err = vio_validate_sid(vio, &msgbuf.tag); | |
395 | if (err < 0) | |
396 | break; | |
397 | ||
398 | if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) { | |
399 | if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) | |
400 | err = vdc_ack(port, &msgbuf); | |
401 | else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) | |
402 | err = vdc_nack(port, &msgbuf); | |
403 | else | |
404 | err = vdc_handle_unknown(port, &msgbuf); | |
405 | } else if (msgbuf.tag.type == VIO_TYPE_CTRL) { | |
406 | err = vio_control_pkt_engine(vio, &msgbuf); | |
407 | } else { | |
408 | err = vdc_handle_unknown(port, &msgbuf); | |
409 | } | |
410 | if (err < 0) | |
411 | break; | |
412 | } | |
413 | if (err < 0) | |
414 | vdc_finish(&port->vio, err, WAITING_FOR_ANY); | |
76e74bbe | 415 | out: |
667ef3c3 DM |
416 | spin_unlock_irqrestore(&vio->lock, flags); |
417 | } | |
418 | ||
419 | static int __vdc_tx_trigger(struct vdc_port *port) | |
420 | { | |
421 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
422 | struct vio_dring_data hdr = { | |
423 | .tag = { | |
424 | .type = VIO_TYPE_DATA, | |
425 | .stype = VIO_SUBTYPE_INFO, | |
426 | .stype_env = VIO_DRING_DATA, | |
427 | .sid = vio_send_sid(&port->vio), | |
428 | }, | |
429 | .dring_ident = dr->ident, | |
430 | .start_idx = dr->prod, | |
431 | .end_idx = dr->prod, | |
432 | }; | |
433 | int err, delay; | |
434 | ||
435 | hdr.seq = dr->snd_nxt; | |
436 | delay = 1; | |
437 | do { | |
438 | err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); | |
439 | if (err > 0) { | |
440 | dr->snd_nxt++; | |
441 | break; | |
442 | } | |
443 | udelay(delay); | |
444 | if ((delay <<= 1) > 128) | |
445 | delay = 128; | |
446 | } while (err == -EAGAIN); | |
447 | ||
76e74bbe DE |
448 | if (err == -ENOTCONN) |
449 | vdc_ldc_reset(port); | |
667ef3c3 DM |
450 | return err; |
451 | } | |
452 | ||
453 | static int __send_request(struct request *req) | |
454 | { | |
455 | struct vdc_port *port = req->rq_disk->private_data; | |
456 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
ff5d1a42 | 457 | struct scatterlist sg[MAX_RING_COOKIES]; |
667ef3c3 DM |
458 | struct vdc_req_entry *rqe; |
459 | struct vio_disk_desc *desc; | |
460 | unsigned int map_perm; | |
461 | int nsg, err, i; | |
462 | u64 len; | |
463 | u8 op; | |
464 | ||
ff5d1a42 KC |
465 | if (WARN_ON(port->ring_cookies > MAX_RING_COOKIES)) |
466 | return -EINVAL; | |
467 | ||
667ef3c3 DM |
468 | map_perm = LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO; |
469 | ||
470 | if (rq_data_dir(req) == READ) { | |
471 | map_perm |= LDC_MAP_W; | |
472 | op = VD_OP_BREAD; | |
473 | } else { | |
474 | map_perm |= LDC_MAP_R; | |
475 | op = VD_OP_BWRITE; | |
476 | } | |
477 | ||
45711f1a | 478 | sg_init_table(sg, port->ring_cookies); |
667ef3c3 DM |
479 | nsg = blk_rq_map_sg(req->q, req, sg); |
480 | ||
481 | len = 0; | |
482 | for (i = 0; i < nsg; i++) | |
483 | len += sg[i].length; | |
484 | ||
667ef3c3 DM |
485 | desc = vio_dring_cur(dr); |
486 | ||
487 | err = ldc_map_sg(port->vio.lp, sg, nsg, | |
488 | desc->cookies, port->ring_cookies, | |
489 | map_perm); | |
490 | if (err < 0) { | |
491 | printk(KERN_ERR PFX "ldc_map_sg() failure, err=%d.\n", err); | |
492 | return err; | |
493 | } | |
494 | ||
495 | rqe = &port->rq_arr[dr->prod]; | |
496 | rqe->req = req; | |
497 | ||
498 | desc->hdr.ack = VIO_ACK_ENABLE; | |
499 | desc->req_id = port->req_id; | |
500 | desc->operation = op; | |
501 | if (port->vdisk_type == VD_DISK_TYPE_DISK) { | |
1bd4b280 | 502 | desc->slice = 0xff; |
667ef3c3 DM |
503 | } else { |
504 | desc->slice = 0; | |
505 | } | |
506 | desc->status = ~0; | |
83096ebf | 507 | desc->offset = (blk_rq_pos(req) << 9) / port->vdisk_block_size; |
667ef3c3 DM |
508 | desc->size = len; |
509 | desc->ncookies = err; | |
510 | ||
511 | /* This has to be a non-SMP write barrier because we are writing | |
512 | * to memory which is shared with the peer LDOM. | |
513 | */ | |
514 | wmb(); | |
515 | desc->hdr.state = VIO_DESC_READY; | |
516 | ||
517 | err = __vdc_tx_trigger(port); | |
518 | if (err < 0) { | |
519 | printk(KERN_ERR PFX "vdc_tx_trigger() failure, err=%d\n", err); | |
520 | } else { | |
521 | port->req_id++; | |
fe47c3c2 | 522 | dr->prod = vio_dring_next(dr, dr->prod); |
667ef3c3 | 523 | } |
667ef3c3 DM |
524 | |
525 | return err; | |
526 | } | |
527 | ||
d0aedcd4 | 528 | static void do_vdc_request(struct request_queue *rq) |
667ef3c3 | 529 | { |
d0aedcd4 | 530 | struct request *req; |
667ef3c3 | 531 | |
d0aedcd4 DE |
532 | while ((req = blk_peek_request(rq)) != NULL) { |
533 | struct vdc_port *port; | |
534 | struct vio_dring_state *dr; | |
667ef3c3 | 535 | |
d0aedcd4 DE |
536 | port = req->rq_disk->private_data; |
537 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
538 | if (unlikely(vdc_tx_dring_avail(dr) < 1)) | |
539 | goto wait; | |
540 | ||
541 | blk_start_request(req); | |
542 | ||
543 | if (__send_request(req) < 0) { | |
544 | blk_requeue_request(rq, req); | |
545 | wait: | |
546 | /* Avoid pointless unplugs. */ | |
547 | blk_stop_queue(rq); | |
548 | break; | |
549 | } | |
667ef3c3 DM |
550 | } |
551 | } | |
552 | ||
553 | static int generic_request(struct vdc_port *port, u8 op, void *buf, int len) | |
554 | { | |
555 | struct vio_dring_state *dr; | |
556 | struct vio_completion comp; | |
557 | struct vio_disk_desc *desc; | |
558 | unsigned int map_perm; | |
559 | unsigned long flags; | |
560 | int op_len, err; | |
561 | void *req_buf; | |
562 | ||
f4d96054 | 563 | if (!(((u64)1 << (u64)op) & port->operations)) |
667ef3c3 DM |
564 | return -EOPNOTSUPP; |
565 | ||
566 | switch (op) { | |
567 | case VD_OP_BREAD: | |
568 | case VD_OP_BWRITE: | |
569 | default: | |
570 | return -EINVAL; | |
571 | ||
572 | case VD_OP_FLUSH: | |
573 | op_len = 0; | |
574 | map_perm = 0; | |
575 | break; | |
576 | ||
577 | case VD_OP_GET_WCE: | |
578 | op_len = sizeof(u32); | |
579 | map_perm = LDC_MAP_W; | |
580 | break; | |
581 | ||
582 | case VD_OP_SET_WCE: | |
583 | op_len = sizeof(u32); | |
584 | map_perm = LDC_MAP_R; | |
585 | break; | |
586 | ||
587 | case VD_OP_GET_VTOC: | |
588 | op_len = sizeof(struct vio_disk_vtoc); | |
589 | map_perm = LDC_MAP_W; | |
590 | break; | |
591 | ||
592 | case VD_OP_SET_VTOC: | |
593 | op_len = sizeof(struct vio_disk_vtoc); | |
594 | map_perm = LDC_MAP_R; | |
595 | break; | |
596 | ||
597 | case VD_OP_GET_DISKGEOM: | |
598 | op_len = sizeof(struct vio_disk_geom); | |
599 | map_perm = LDC_MAP_W; | |
600 | break; | |
601 | ||
602 | case VD_OP_SET_DISKGEOM: | |
603 | op_len = sizeof(struct vio_disk_geom); | |
604 | map_perm = LDC_MAP_R; | |
605 | break; | |
606 | ||
607 | case VD_OP_SCSICMD: | |
608 | op_len = 16; | |
609 | map_perm = LDC_MAP_RW; | |
610 | break; | |
611 | ||
612 | case VD_OP_GET_DEVID: | |
613 | op_len = sizeof(struct vio_disk_devid); | |
614 | map_perm = LDC_MAP_W; | |
615 | break; | |
616 | ||
617 | case VD_OP_GET_EFI: | |
618 | case VD_OP_SET_EFI: | |
619 | return -EOPNOTSUPP; | |
620 | break; | |
621 | }; | |
622 | ||
623 | map_perm |= LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO; | |
624 | ||
625 | op_len = (op_len + 7) & ~7; | |
626 | req_buf = kzalloc(op_len, GFP_KERNEL); | |
627 | if (!req_buf) | |
628 | return -ENOMEM; | |
629 | ||
630 | if (len > op_len) | |
631 | len = op_len; | |
632 | ||
633 | if (map_perm & LDC_MAP_R) | |
634 | memcpy(req_buf, buf, len); | |
635 | ||
636 | spin_lock_irqsave(&port->vio.lock, flags); | |
637 | ||
638 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
639 | ||
640 | /* XXX If we want to use this code generically we have to | |
641 | * XXX handle TX ring exhaustion etc. | |
642 | */ | |
643 | desc = vio_dring_cur(dr); | |
644 | ||
645 | err = ldc_map_single(port->vio.lp, req_buf, op_len, | |
646 | desc->cookies, port->ring_cookies, | |
647 | map_perm); | |
648 | if (err < 0) { | |
649 | spin_unlock_irqrestore(&port->vio.lock, flags); | |
650 | kfree(req_buf); | |
651 | return err; | |
652 | } | |
653 | ||
654 | init_completion(&comp.com); | |
655 | comp.waiting_for = WAITING_FOR_GEN_CMD; | |
656 | port->vio.cmp = ∁ | |
657 | ||
658 | desc->hdr.ack = VIO_ACK_ENABLE; | |
659 | desc->req_id = port->req_id; | |
660 | desc->operation = op; | |
661 | desc->slice = 0; | |
662 | desc->status = ~0; | |
663 | desc->offset = 0; | |
664 | desc->size = op_len; | |
665 | desc->ncookies = err; | |
666 | ||
667 | /* This has to be a non-SMP write barrier because we are writing | |
668 | * to memory which is shared with the peer LDOM. | |
669 | */ | |
670 | wmb(); | |
671 | desc->hdr.state = VIO_DESC_READY; | |
672 | ||
673 | err = __vdc_tx_trigger(port); | |
674 | if (err >= 0) { | |
675 | port->req_id++; | |
fe47c3c2 | 676 | dr->prod = vio_dring_next(dr, dr->prod); |
667ef3c3 DM |
677 | spin_unlock_irqrestore(&port->vio.lock, flags); |
678 | ||
679 | wait_for_completion(&comp.com); | |
680 | err = comp.err; | |
681 | } else { | |
682 | port->vio.cmp = NULL; | |
683 | spin_unlock_irqrestore(&port->vio.lock, flags); | |
684 | } | |
685 | ||
686 | if (map_perm & LDC_MAP_W) | |
687 | memcpy(buf, req_buf, len); | |
688 | ||
689 | kfree(req_buf); | |
690 | ||
691 | return err; | |
692 | } | |
693 | ||
8d85fce7 | 694 | static int vdc_alloc_tx_ring(struct vdc_port *port) |
667ef3c3 DM |
695 | { |
696 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
697 | unsigned long len, entry_size; | |
698 | int ncookies; | |
699 | void *dring; | |
700 | ||
701 | entry_size = sizeof(struct vio_disk_desc) + | |
702 | (sizeof(struct ldc_trans_cookie) * port->ring_cookies); | |
703 | len = (VDC_TX_RING_SIZE * entry_size); | |
704 | ||
705 | ncookies = VIO_MAX_RING_COOKIES; | |
706 | dring = ldc_alloc_exp_dring(port->vio.lp, len, | |
707 | dr->cookies, &ncookies, | |
708 | (LDC_MAP_SHADOW | | |
709 | LDC_MAP_DIRECT | | |
710 | LDC_MAP_RW)); | |
711 | if (IS_ERR(dring)) | |
712 | return PTR_ERR(dring); | |
713 | ||
714 | dr->base = dring; | |
715 | dr->entry_size = entry_size; | |
716 | dr->num_entries = VDC_TX_RING_SIZE; | |
717 | dr->prod = dr->cons = 0; | |
718 | dr->pending = VDC_TX_RING_SIZE; | |
719 | dr->ncookies = ncookies; | |
720 | ||
721 | return 0; | |
722 | } | |
723 | ||
724 | static void vdc_free_tx_ring(struct vdc_port *port) | |
725 | { | |
726 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
727 | ||
728 | if (dr->base) { | |
729 | ldc_free_exp_dring(port->vio.lp, dr->base, | |
730 | (dr->entry_size * dr->num_entries), | |
731 | dr->cookies, dr->ncookies); | |
732 | dr->base = NULL; | |
733 | dr->entry_size = 0; | |
734 | dr->num_entries = 0; | |
735 | dr->pending = 0; | |
736 | dr->ncookies = 0; | |
737 | } | |
738 | } | |
739 | ||
76e74bbe | 740 | static int vdc_port_up(struct vdc_port *port) |
667ef3c3 DM |
741 | { |
742 | struct vio_completion comp; | |
667ef3c3 DM |
743 | |
744 | init_completion(&comp.com); | |
745 | comp.err = 0; | |
746 | comp.waiting_for = WAITING_FOR_LINK_UP; | |
747 | port->vio.cmp = ∁ | |
748 | ||
749 | vio_port_up(&port->vio); | |
667ef3c3 | 750 | wait_for_completion(&comp.com); |
76e74bbe DE |
751 | return comp.err; |
752 | } | |
753 | ||
754 | static void vdc_port_down(struct vdc_port *port) | |
755 | { | |
756 | ldc_disconnect(port->vio.lp); | |
757 | ldc_unbind(port->vio.lp); | |
758 | vdc_free_tx_ring(port); | |
759 | vio_ldc_free(&port->vio); | |
760 | } | |
761 | ||
762 | static int probe_disk(struct vdc_port *port) | |
763 | { | |
764 | struct request_queue *q; | |
765 | struct gendisk *g; | |
766 | int err; | |
767 | ||
768 | err = vdc_port_up(port); | |
769 | if (err) | |
770 | return err; | |
667ef3c3 | 771 | |
f41e5461 LH |
772 | /* Using version 1.2 means vdisk_phys_blksz should be set unless the |
773 | * disk is reserved by another system. | |
774 | */ | |
775 | if (vdc_version_supported(port, 1, 2) && !port->vdisk_phys_blksz) | |
776 | return -ENODEV; | |
777 | ||
9bce2182 AP |
778 | if (vdc_version_supported(port, 1, 1)) { |
779 | /* vdisk_size should be set during the handshake, if it wasn't | |
780 | * then the underlying disk is reserved by another system | |
781 | */ | |
782 | if (port->vdisk_size == -1) | |
783 | return -ENODEV; | |
784 | } else { | |
de5b73f0 AP |
785 | struct vio_disk_geom geom; |
786 | ||
9bce2182 | 787 | err = generic_request(port, VD_OP_GET_DISKGEOM, |
de5b73f0 | 788 | &geom, sizeof(geom)); |
9bce2182 AP |
789 | if (err < 0) { |
790 | printk(KERN_ERR PFX "VD_OP_GET_DISKGEOM returns " | |
791 | "error %d\n", err); | |
792 | return err; | |
793 | } | |
de5b73f0 AP |
794 | port->vdisk_size = ((u64)geom.num_cyl * |
795 | (u64)geom.num_hd * | |
796 | (u64)geom.num_sec); | |
667ef3c3 DM |
797 | } |
798 | ||
667ef3c3 DM |
799 | q = blk_init_queue(do_vdc_request, &port->vio.lock); |
800 | if (!q) { | |
801 | printk(KERN_ERR PFX "%s: Could not allocate queue.\n", | |
802 | port->vio.name); | |
803 | return -ENOMEM; | |
804 | } | |
805 | g = alloc_disk(1 << PARTITION_SHIFT); | |
806 | if (!g) { | |
807 | printk(KERN_ERR PFX "%s: Could not allocate gendisk.\n", | |
808 | port->vio.name); | |
809 | blk_cleanup_queue(q); | |
810 | return -ENOMEM; | |
811 | } | |
812 | ||
813 | port->disk = g; | |
814 | ||
5eed69ff DE |
815 | /* Each segment in a request is up to an aligned page in size. */ |
816 | blk_queue_segment_boundary(q, PAGE_SIZE - 1); | |
817 | blk_queue_max_segment_size(q, PAGE_SIZE); | |
818 | ||
8a78362c | 819 | blk_queue_max_segments(q, port->ring_cookies); |
086fa5ff | 820 | blk_queue_max_hw_sectors(q, port->max_xfer_size); |
667ef3c3 | 821 | g->major = vdc_major; |
91ba3c21 | 822 | g->first_minor = port->vio.vdev->dev_no << PARTITION_SHIFT; |
667ef3c3 DM |
823 | strcpy(g->disk_name, port->disk_name); |
824 | ||
825 | g->fops = &vdc_fops; | |
826 | g->queue = q; | |
827 | g->private_data = port; | |
667ef3c3 DM |
828 | |
829 | set_capacity(g, port->vdisk_size); | |
830 | ||
9bce2182 AP |
831 | if (vdc_version_supported(port, 1, 1)) { |
832 | switch (port->vdisk_mtype) { | |
833 | case VD_MEDIA_TYPE_CD: | |
834 | pr_info(PFX "Virtual CDROM %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_DVD: | |
841 | pr_info(PFX "Virtual DVD %s\n", port->disk_name); | |
842 | g->flags |= GENHD_FL_CD; | |
843 | g->flags |= GENHD_FL_REMOVABLE; | |
844 | set_disk_ro(g, 1); | |
845 | break; | |
846 | ||
847 | case VD_MEDIA_TYPE_FIXED: | |
848 | pr_info(PFX "Virtual Hard disk %s\n", port->disk_name); | |
849 | break; | |
850 | } | |
851 | } | |
852 | ||
f41e5461 LH |
853 | blk_queue_physical_block_size(q, port->vdisk_phys_blksz); |
854 | ||
9bce2182 | 855 | pr_info(PFX "%s: %u sectors (%u MB) protocol %d.%d\n", |
667ef3c3 | 856 | g->disk_name, |
9bce2182 AP |
857 | port->vdisk_size, (port->vdisk_size >> (20 - 9)), |
858 | port->vio.ver.major, port->vio.ver.minor); | |
667ef3c3 | 859 | |
fef912bf | 860 | device_add_disk(&port->vio.vdev->dev, g, NULL); |
667ef3c3 DM |
861 | |
862 | return 0; | |
863 | } | |
864 | ||
865 | static struct ldc_channel_config vdc_ldc_cfg = { | |
866 | .event = vdc_event, | |
867 | .mtu = 64, | |
868 | .mode = LDC_MODE_UNRELIABLE, | |
869 | }; | |
870 | ||
871 | static struct vio_driver_ops vdc_vio_ops = { | |
872 | .send_attr = vdc_send_attr, | |
873 | .handle_attr = vdc_handle_attr, | |
874 | .handshake_complete = vdc_handshake_complete, | |
875 | }; | |
876 | ||
8d85fce7 | 877 | static void print_version(void) |
80dc35df DM |
878 | { |
879 | static int version_printed; | |
880 | ||
881 | if (version_printed++ == 0) | |
882 | printk(KERN_INFO "%s", version); | |
883 | } | |
884 | ||
3ee70591 JQ |
885 | struct vdc_check_port_data { |
886 | int dev_no; | |
887 | char *type; | |
888 | }; | |
889 | ||
890 | static int vdc_device_probed(struct device *dev, void *arg) | |
891 | { | |
892 | struct vio_dev *vdev = to_vio_dev(dev); | |
893 | struct vdc_check_port_data *port_data; | |
894 | ||
895 | port_data = (struct vdc_check_port_data *)arg; | |
896 | ||
897 | if ((vdev->dev_no == port_data->dev_no) && | |
898 | (!(strcmp((char *)&vdev->type, port_data->type))) && | |
899 | dev_get_drvdata(dev)) { | |
900 | /* This device has already been configured | |
901 | * by vdc_port_probe() | |
902 | */ | |
903 | return 1; | |
904 | } else { | |
905 | return 0; | |
906 | } | |
907 | } | |
908 | ||
909 | /* Determine whether the VIO device is part of an mpgroup | |
910 | * by locating all the virtual-device-port nodes associated | |
911 | * with the parent virtual-device node for the VIO device | |
912 | * and checking whether any of these nodes are vdc-ports | |
913 | * which have already been configured. | |
914 | * | |
915 | * Returns true if this device is part of an mpgroup and has | |
916 | * already been probed. | |
917 | */ | |
918 | static bool vdc_port_mpgroup_check(struct vio_dev *vdev) | |
919 | { | |
920 | struct vdc_check_port_data port_data; | |
921 | struct device *dev; | |
922 | ||
923 | port_data.dev_no = vdev->dev_no; | |
924 | port_data.type = (char *)&vdev->type; | |
925 | ||
926 | dev = device_find_child(vdev->dev.parent, &port_data, | |
927 | vdc_device_probed); | |
928 | ||
929 | if (dev) | |
930 | return true; | |
931 | ||
932 | return false; | |
933 | } | |
934 | ||
8d85fce7 | 935 | static int vdc_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) |
667ef3c3 | 936 | { |
43fdf274 | 937 | struct mdesc_handle *hp; |
667ef3c3 | 938 | struct vdc_port *port; |
667ef3c3 | 939 | int err; |
76e74bbe | 940 | const u64 *ldc_timeout; |
667ef3c3 | 941 | |
80dc35df | 942 | print_version(); |
667ef3c3 | 943 | |
43fdf274 | 944 | hp = mdesc_grab(); |
667ef3c3 | 945 | |
43fdf274 | 946 | err = -ENODEV; |
91ba3c21 | 947 | if ((vdev->dev_no << PARTITION_SHIFT) & ~(u64)MINORMASK) { |
3f4528d6 | 948 | printk(KERN_ERR PFX "Port id [%llu] too large.\n", |
91ba3c21 | 949 | vdev->dev_no); |
43fdf274 | 950 | goto err_out_release_mdesc; |
667ef3c3 DM |
951 | } |
952 | ||
3ee70591 JQ |
953 | /* Check if this device is part of an mpgroup */ |
954 | if (vdc_port_mpgroup_check(vdev)) { | |
955 | printk(KERN_WARNING | |
956 | "VIO: Ignoring extra vdisk port %s", | |
957 | dev_name(&vdev->dev)); | |
958 | goto err_out_release_mdesc; | |
959 | } | |
960 | ||
667ef3c3 | 961 | port = kzalloc(sizeof(*port), GFP_KERNEL); |
43fdf274 | 962 | err = -ENOMEM; |
667ef3c3 DM |
963 | if (!port) { |
964 | printk(KERN_ERR PFX "Cannot allocate vdc_port.\n"); | |
43fdf274 | 965 | goto err_out_release_mdesc; |
667ef3c3 DM |
966 | } |
967 | ||
91ba3c21 | 968 | if (vdev->dev_no >= 26) |
667ef3c3 DM |
969 | snprintf(port->disk_name, sizeof(port->disk_name), |
970 | VDCBLK_NAME "%c%c", | |
91ba3c21 DM |
971 | 'a' + ((int)vdev->dev_no / 26) - 1, |
972 | 'a' + ((int)vdev->dev_no % 26)); | |
667ef3c3 DM |
973 | else |
974 | snprintf(port->disk_name, sizeof(port->disk_name), | |
91ba3c21 | 975 | VDCBLK_NAME "%c", 'a' + ((int)vdev->dev_no % 26)); |
9bce2182 | 976 | port->vdisk_size = -1; |
667ef3c3 | 977 | |
76e74bbe DE |
978 | /* Actual wall time may be double due to do_generic_file_read() doing |
979 | * a readahead I/O first, and once that fails it will try to read a | |
980 | * single page. | |
981 | */ | |
982 | ldc_timeout = mdesc_get_property(hp, vdev->mp, "vdc-timeout", NULL); | |
983 | port->ldc_timeout = ldc_timeout ? *ldc_timeout : 0; | |
e99e88a9 | 984 | timer_setup(&port->ldc_reset_timer, vdc_ldc_reset_timer, 0); |
76e74bbe DE |
985 | INIT_WORK(&port->ldc_reset_work, vdc_ldc_reset_work); |
986 | ||
43fdf274 | 987 | err = vio_driver_init(&port->vio, vdev, VDEV_DISK, |
667ef3c3 DM |
988 | vdc_versions, ARRAY_SIZE(vdc_versions), |
989 | &vdc_vio_ops, port->disk_name); | |
990 | if (err) | |
991 | goto err_out_free_port; | |
992 | ||
f41e5461 | 993 | port->vdisk_block_size = VDC_DEFAULT_BLK_SIZE; |
ff5d1a42 KC |
994 | port->max_xfer_size = MAX_XFER_SIZE; |
995 | port->ring_cookies = MAX_RING_COOKIES; | |
667ef3c3 DM |
996 | |
997 | err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port); | |
998 | if (err) | |
999 | goto err_out_free_port; | |
1000 | ||
1001 | err = vdc_alloc_tx_ring(port); | |
1002 | if (err) | |
1003 | goto err_out_free_ldc; | |
1004 | ||
1005 | err = probe_disk(port); | |
1006 | if (err) | |
1007 | goto err_out_free_tx_ring; | |
1008 | ||
3ee70591 JQ |
1009 | /* Note that the device driver_data is used to determine |
1010 | * whether the port has been probed. | |
1011 | */ | |
667ef3c3 DM |
1012 | dev_set_drvdata(&vdev->dev, port); |
1013 | ||
43fdf274 DM |
1014 | mdesc_release(hp); |
1015 | ||
667ef3c3 DM |
1016 | return 0; |
1017 | ||
1018 | err_out_free_tx_ring: | |
1019 | vdc_free_tx_ring(port); | |
1020 | ||
1021 | err_out_free_ldc: | |
1022 | vio_ldc_free(&port->vio); | |
1023 | ||
1024 | err_out_free_port: | |
1025 | kfree(port); | |
1026 | ||
43fdf274 DM |
1027 | err_out_release_mdesc: |
1028 | mdesc_release(hp); | |
667ef3c3 DM |
1029 | return err; |
1030 | } | |
1031 | ||
1032 | static int vdc_port_remove(struct vio_dev *vdev) | |
1033 | { | |
1034 | struct vdc_port *port = dev_get_drvdata(&vdev->dev); | |
1035 | ||
1036 | if (port) { | |
31f4888f DE |
1037 | unsigned long flags; |
1038 | ||
1039 | spin_lock_irqsave(&port->vio.lock, flags); | |
1040 | blk_stop_queue(port->disk->queue); | |
1041 | spin_unlock_irqrestore(&port->vio.lock, flags); | |
1042 | ||
76e74bbe DE |
1043 | flush_work(&port->ldc_reset_work); |
1044 | del_timer_sync(&port->ldc_reset_timer); | |
667ef3c3 DM |
1045 | del_timer_sync(&port->vio.timer); |
1046 | ||
31f4888f DE |
1047 | del_gendisk(port->disk); |
1048 | blk_cleanup_queue(port->disk->queue); | |
1049 | put_disk(port->disk); | |
1050 | port->disk = NULL; | |
1051 | ||
667ef3c3 DM |
1052 | vdc_free_tx_ring(port); |
1053 | vio_ldc_free(&port->vio); | |
1054 | ||
1055 | dev_set_drvdata(&vdev->dev, NULL); | |
1056 | ||
1057 | kfree(port); | |
1058 | } | |
1059 | return 0; | |
1060 | } | |
1061 | ||
76e74bbe DE |
1062 | static void vdc_requeue_inflight(struct vdc_port *port) |
1063 | { | |
1064 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
1065 | u32 idx; | |
1066 | ||
1067 | for (idx = dr->cons; idx != dr->prod; idx = vio_dring_next(dr, idx)) { | |
1068 | struct vio_disk_desc *desc = vio_dring_entry(dr, idx); | |
1069 | struct vdc_req_entry *rqe = &port->rq_arr[idx]; | |
1070 | struct request *req; | |
1071 | ||
1072 | ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies); | |
1073 | desc->hdr.state = VIO_DESC_FREE; | |
1074 | dr->cons = vio_dring_next(dr, idx); | |
1075 | ||
1076 | req = rqe->req; | |
1077 | if (req == NULL) { | |
1078 | vdc_end_special(port, desc); | |
1079 | continue; | |
1080 | } | |
1081 | ||
1082 | rqe->req = NULL; | |
1083 | blk_requeue_request(port->disk->queue, req); | |
1084 | } | |
1085 | } | |
1086 | ||
1087 | static void vdc_queue_drain(struct vdc_port *port) | |
1088 | { | |
1089 | struct request *req; | |
1090 | ||
1091 | while ((req = blk_fetch_request(port->disk->queue)) != NULL) | |
2a842aca | 1092 | __blk_end_request_all(req, BLK_STS_IOERR); |
76e74bbe DE |
1093 | } |
1094 | ||
e99e88a9 | 1095 | static void vdc_ldc_reset_timer(struct timer_list *t) |
76e74bbe | 1096 | { |
e99e88a9 | 1097 | struct vdc_port *port = from_timer(port, t, ldc_reset_timer); |
76e74bbe DE |
1098 | struct vio_driver_state *vio = &port->vio; |
1099 | unsigned long flags; | |
1100 | ||
1101 | spin_lock_irqsave(&vio->lock, flags); | |
1102 | if (!(port->vio.hs_state & VIO_HS_COMPLETE)) { | |
1103 | pr_warn(PFX "%s ldc down %llu seconds, draining queue\n", | |
1104 | port->disk_name, port->ldc_timeout); | |
1105 | vdc_queue_drain(port); | |
1106 | vdc_blk_queue_start(port); | |
1107 | } | |
1108 | spin_unlock_irqrestore(&vio->lock, flags); | |
1109 | } | |
1110 | ||
1111 | static void vdc_ldc_reset_work(struct work_struct *work) | |
1112 | { | |
1113 | struct vdc_port *port; | |
1114 | struct vio_driver_state *vio; | |
1115 | unsigned long flags; | |
1116 | ||
1117 | port = container_of(work, struct vdc_port, ldc_reset_work); | |
1118 | vio = &port->vio; | |
1119 | ||
1120 | spin_lock_irqsave(&vio->lock, flags); | |
1121 | vdc_ldc_reset(port); | |
1122 | spin_unlock_irqrestore(&vio->lock, flags); | |
1123 | } | |
1124 | ||
1125 | static void vdc_ldc_reset(struct vdc_port *port) | |
1126 | { | |
1127 | int err; | |
1128 | ||
1129 | assert_spin_locked(&port->vio.lock); | |
1130 | ||
1131 | pr_warn(PFX "%s ldc link reset\n", port->disk_name); | |
1132 | blk_stop_queue(port->disk->queue); | |
1133 | vdc_requeue_inflight(port); | |
1134 | vdc_port_down(port); | |
1135 | ||
1136 | err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port); | |
1137 | if (err) { | |
1138 | pr_err(PFX "%s vio_ldc_alloc:%d\n", port->disk_name, err); | |
1139 | return; | |
1140 | } | |
1141 | ||
1142 | err = vdc_alloc_tx_ring(port); | |
1143 | if (err) { | |
1144 | pr_err(PFX "%s vio_alloc_tx_ring:%d\n", port->disk_name, err); | |
1145 | goto err_free_ldc; | |
1146 | } | |
1147 | ||
1148 | if (port->ldc_timeout) | |
1149 | mod_timer(&port->ldc_reset_timer, | |
1150 | round_jiffies(jiffies + HZ * port->ldc_timeout)); | |
1151 | mod_timer(&port->vio.timer, round_jiffies(jiffies + HZ)); | |
1152 | return; | |
1153 | ||
1154 | err_free_ldc: | |
1155 | vio_ldc_free(&port->vio); | |
1156 | } | |
1157 | ||
3d452e55 | 1158 | static const struct vio_device_id vdc_port_match[] = { |
667ef3c3 DM |
1159 | { |
1160 | .type = "vdc-port", | |
1161 | }, | |
1162 | {}, | |
1163 | }; | |
da68e081 | 1164 | MODULE_DEVICE_TABLE(vio, vdc_port_match); |
667ef3c3 DM |
1165 | |
1166 | static struct vio_driver vdc_port_driver = { | |
1167 | .id_table = vdc_port_match, | |
1168 | .probe = vdc_port_probe, | |
1169 | .remove = vdc_port_remove, | |
cb52d897 | 1170 | .name = "vdc_port", |
667ef3c3 DM |
1171 | }; |
1172 | ||
667ef3c3 DM |
1173 | static int __init vdc_init(void) |
1174 | { | |
1175 | int err; | |
1176 | ||
76e74bbe DE |
1177 | sunvdc_wq = alloc_workqueue("sunvdc", 0, 0); |
1178 | if (!sunvdc_wq) | |
1179 | return -ENOMEM; | |
1180 | ||
667ef3c3 DM |
1181 | err = register_blkdev(0, VDCBLK_NAME); |
1182 | if (err < 0) | |
76e74bbe | 1183 | goto out_free_wq; |
667ef3c3 DM |
1184 | |
1185 | vdc_major = err; | |
667ef3c3 DM |
1186 | |
1187 | err = vio_register_driver(&vdc_port_driver); | |
1188 | if (err) | |
80dc35df | 1189 | goto out_unregister_blkdev; |
667ef3c3 DM |
1190 | |
1191 | return 0; | |
1192 | ||
667ef3c3 DM |
1193 | out_unregister_blkdev: |
1194 | unregister_blkdev(vdc_major, VDCBLK_NAME); | |
1195 | vdc_major = 0; | |
1196 | ||
76e74bbe DE |
1197 | out_free_wq: |
1198 | destroy_workqueue(sunvdc_wq); | |
667ef3c3 DM |
1199 | return err; |
1200 | } | |
1201 | ||
1202 | static void __exit vdc_exit(void) | |
1203 | { | |
1204 | vio_unregister_driver(&vdc_port_driver); | |
667ef3c3 | 1205 | unregister_blkdev(vdc_major, VDCBLK_NAME); |
76e74bbe | 1206 | destroy_workqueue(sunvdc_wq); |
667ef3c3 DM |
1207 | } |
1208 | ||
1209 | module_init(vdc_init); | |
1210 | module_exit(vdc_exit); |