David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 1 | /* sunvdc.c: Sun LDOM Virtual Disk Client. |
| 2 | * |
David S. Miller | 3d452e5 | 2008-09-01 01:48:52 -0700 | [diff] [blame] | 3 | * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net> |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 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> |
| 12 | #include <linux/slab.h> |
| 13 | #include <linux/spinlock.h> |
| 14 | #include <linux/completion.h> |
| 15 | #include <linux/delay.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/list.h> |
David Miller | d91c5e8 | 2007-10-24 08:46:01 +0200 | [diff] [blame] | 18 | #include <linux/scatterlist.h> |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 19 | |
| 20 | #include <asm/vio.h> |
| 21 | #include <asm/ldc.h> |
| 22 | |
| 23 | #define DRV_MODULE_NAME "sunvdc" |
| 24 | #define PFX DRV_MODULE_NAME ": " |
| 25 | #define DRV_MODULE_VERSION "1.0" |
| 26 | #define DRV_MODULE_RELDATE "June 25, 2007" |
| 27 | |
| 28 | static char version[] __devinitdata = |
| 29 | DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; |
| 30 | MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); |
| 31 | MODULE_DESCRIPTION("Sun LDOM virtual disk client driver"); |
| 32 | MODULE_LICENSE("GPL"); |
| 33 | MODULE_VERSION(DRV_MODULE_VERSION); |
| 34 | |
| 35 | #define VDC_TX_RING_SIZE 256 |
| 36 | |
| 37 | #define WAITING_FOR_LINK_UP 0x01 |
| 38 | #define WAITING_FOR_TX_SPACE 0x02 |
| 39 | #define WAITING_FOR_GEN_CMD 0x04 |
| 40 | #define WAITING_FOR_ANY -1 |
| 41 | |
| 42 | struct vdc_req_entry { |
| 43 | struct request *req; |
| 44 | }; |
| 45 | |
| 46 | struct vdc_port { |
| 47 | struct vio_driver_state vio; |
| 48 | |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 49 | struct gendisk *disk; |
| 50 | |
| 51 | struct vdc_completion *cmp; |
| 52 | |
| 53 | u64 req_id; |
| 54 | u64 seq; |
| 55 | struct vdc_req_entry rq_arr[VDC_TX_RING_SIZE]; |
| 56 | |
| 57 | unsigned long ring_cookies; |
| 58 | |
| 59 | u64 max_xfer_size; |
| 60 | u32 vdisk_block_size; |
| 61 | |
| 62 | /* The server fills these in for us in the disk attribute |
| 63 | * ACK packet. |
| 64 | */ |
| 65 | u64 operations; |
| 66 | u32 vdisk_size; |
| 67 | u8 vdisk_type; |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 68 | |
| 69 | char disk_name[32]; |
| 70 | |
| 71 | struct vio_disk_geom geom; |
| 72 | struct vio_disk_vtoc label; |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 73 | }; |
| 74 | |
| 75 | static inline struct vdc_port *to_vdc_port(struct vio_driver_state *vio) |
| 76 | { |
| 77 | return container_of(vio, struct vdc_port, vio); |
| 78 | } |
| 79 | |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 80 | /* Ordered from largest major to lowest */ |
| 81 | static struct vio_version vdc_versions[] = { |
| 82 | { .major = 1, .minor = 0 }, |
| 83 | }; |
| 84 | |
| 85 | #define VDCBLK_NAME "vdisk" |
| 86 | static int vdc_major; |
| 87 | #define PARTITION_SHIFT 3 |
| 88 | |
| 89 | static inline u32 vdc_tx_dring_avail(struct vio_dring_state *dr) |
| 90 | { |
| 91 | return vio_dring_avail(dr, VDC_TX_RING_SIZE); |
| 92 | } |
| 93 | |
| 94 | static int vdc_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
| 95 | { |
| 96 | struct gendisk *disk = bdev->bd_disk; |
| 97 | struct vdc_port *port = disk->private_data; |
| 98 | |
| 99 | geo->heads = (u8) port->geom.num_hd; |
| 100 | geo->sectors = (u8) port->geom.num_sec; |
| 101 | geo->cylinders = port->geom.num_cyl; |
| 102 | |
| 103 | return 0; |
| 104 | } |
| 105 | |
Alexey Dobriyan | 83d5cde | 2009-09-21 17:01:13 -0700 | [diff] [blame] | 106 | static const struct block_device_operations vdc_fops = { |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 107 | .owner = THIS_MODULE, |
| 108 | .getgeo = vdc_getgeo, |
| 109 | }; |
| 110 | |
| 111 | static void vdc_finish(struct vio_driver_state *vio, int err, int waiting_for) |
| 112 | { |
| 113 | if (vio->cmp && |
| 114 | (waiting_for == -1 || |
| 115 | vio->cmp->waiting_for == waiting_for)) { |
| 116 | vio->cmp->err = err; |
| 117 | complete(&vio->cmp->com); |
| 118 | vio->cmp = NULL; |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | static void vdc_handshake_complete(struct vio_driver_state *vio) |
| 123 | { |
| 124 | vdc_finish(vio, 0, WAITING_FOR_LINK_UP); |
| 125 | } |
| 126 | |
| 127 | static int vdc_handle_unknown(struct vdc_port *port, void *arg) |
| 128 | { |
| 129 | struct vio_msg_tag *pkt = arg; |
| 130 | |
| 131 | printk(KERN_ERR PFX "Received unknown msg [%02x:%02x:%04x:%08x]\n", |
| 132 | pkt->type, pkt->stype, pkt->stype_env, pkt->sid); |
| 133 | printk(KERN_ERR PFX "Resetting connection.\n"); |
| 134 | |
| 135 | ldc_disconnect(port->vio.lp); |
| 136 | |
| 137 | return -ECONNRESET; |
| 138 | } |
| 139 | |
| 140 | static int vdc_send_attr(struct vio_driver_state *vio) |
| 141 | { |
| 142 | struct vdc_port *port = to_vdc_port(vio); |
| 143 | struct vio_disk_attr_info pkt; |
| 144 | |
| 145 | memset(&pkt, 0, sizeof(pkt)); |
| 146 | |
| 147 | pkt.tag.type = VIO_TYPE_CTRL; |
| 148 | pkt.tag.stype = VIO_SUBTYPE_INFO; |
| 149 | pkt.tag.stype_env = VIO_ATTR_INFO; |
| 150 | pkt.tag.sid = vio_send_sid(vio); |
| 151 | |
| 152 | pkt.xfer_mode = VIO_DRING_MODE; |
| 153 | pkt.vdisk_block_size = port->vdisk_block_size; |
| 154 | pkt.max_xfer_size = port->max_xfer_size; |
| 155 | |
Sam Ravnborg | 3f4528d | 2009-01-06 13:20:38 -0800 | [diff] [blame] | 156 | viodbg(HS, "SEND ATTR xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n", |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 157 | pkt.xfer_mode, pkt.vdisk_block_size, pkt.max_xfer_size); |
| 158 | |
| 159 | return vio_ldc_send(&port->vio, &pkt, sizeof(pkt)); |
| 160 | } |
| 161 | |
| 162 | static int vdc_handle_attr(struct vio_driver_state *vio, void *arg) |
| 163 | { |
| 164 | struct vdc_port *port = to_vdc_port(vio); |
| 165 | struct vio_disk_attr_info *pkt = arg; |
| 166 | |
Sam Ravnborg | 3f4528d | 2009-01-06 13:20:38 -0800 | [diff] [blame] | 167 | viodbg(HS, "GOT ATTR stype[0x%x] ops[%llx] disk_size[%llu] disk_type[%x] " |
| 168 | "xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n", |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 169 | pkt->tag.stype, pkt->operations, |
| 170 | pkt->vdisk_size, pkt->vdisk_type, |
| 171 | pkt->xfer_mode, pkt->vdisk_block_size, |
| 172 | pkt->max_xfer_size); |
| 173 | |
| 174 | if (pkt->tag.stype == VIO_SUBTYPE_ACK) { |
| 175 | switch (pkt->vdisk_type) { |
| 176 | case VD_DISK_TYPE_DISK: |
| 177 | case VD_DISK_TYPE_SLICE: |
| 178 | break; |
| 179 | |
| 180 | default: |
| 181 | printk(KERN_ERR PFX "%s: Bogus vdisk_type 0x%x\n", |
| 182 | vio->name, pkt->vdisk_type); |
| 183 | return -ECONNRESET; |
| 184 | } |
| 185 | |
| 186 | if (pkt->vdisk_block_size > port->vdisk_block_size) { |
| 187 | printk(KERN_ERR PFX "%s: BLOCK size increased " |
| 188 | "%u --> %u\n", |
| 189 | vio->name, |
| 190 | port->vdisk_block_size, pkt->vdisk_block_size); |
| 191 | return -ECONNRESET; |
| 192 | } |
| 193 | |
| 194 | port->operations = pkt->operations; |
| 195 | port->vdisk_size = pkt->vdisk_size; |
| 196 | port->vdisk_type = pkt->vdisk_type; |
| 197 | if (pkt->max_xfer_size < port->max_xfer_size) |
| 198 | port->max_xfer_size = pkt->max_xfer_size; |
| 199 | port->vdisk_block_size = pkt->vdisk_block_size; |
| 200 | return 0; |
| 201 | } else { |
| 202 | printk(KERN_ERR PFX "%s: Attribute NACK\n", vio->name); |
| 203 | |
| 204 | return -ECONNRESET; |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | static void vdc_end_special(struct vdc_port *port, struct vio_disk_desc *desc) |
| 209 | { |
| 210 | int err = desc->status; |
| 211 | |
| 212 | vdc_finish(&port->vio, -err, WAITING_FOR_GEN_CMD); |
| 213 | } |
| 214 | |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 215 | static void vdc_end_one(struct vdc_port *port, struct vio_dring_state *dr, |
| 216 | unsigned int index) |
| 217 | { |
| 218 | struct vio_disk_desc *desc = vio_dring_entry(dr, index); |
| 219 | struct vdc_req_entry *rqe = &port->rq_arr[index]; |
| 220 | struct request *req; |
| 221 | |
| 222 | if (unlikely(desc->hdr.state != VIO_DESC_DONE)) |
| 223 | return; |
| 224 | |
| 225 | ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies); |
| 226 | desc->hdr.state = VIO_DESC_FREE; |
| 227 | dr->cons = (index + 1) & (VDC_TX_RING_SIZE - 1); |
| 228 | |
| 229 | req = rqe->req; |
| 230 | if (req == NULL) { |
| 231 | vdc_end_special(port, desc); |
| 232 | return; |
| 233 | } |
| 234 | |
| 235 | rqe->req = NULL; |
| 236 | |
Tejun Heo | 0442085 | 2009-04-28 13:06:08 +0900 | [diff] [blame] | 237 | __blk_end_request(req, (desc->status ? -EIO : 0), desc->size); |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 238 | |
| 239 | if (blk_queue_stopped(port->disk->queue)) |
| 240 | blk_start_queue(port->disk->queue); |
| 241 | } |
| 242 | |
| 243 | static int vdc_ack(struct vdc_port *port, void *msgbuf) |
| 244 | { |
| 245 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
| 246 | struct vio_dring_data *pkt = msgbuf; |
| 247 | |
| 248 | if (unlikely(pkt->dring_ident != dr->ident || |
| 249 | pkt->start_idx != pkt->end_idx || |
| 250 | pkt->start_idx >= VDC_TX_RING_SIZE)) |
| 251 | return 0; |
| 252 | |
| 253 | vdc_end_one(port, dr, pkt->start_idx); |
| 254 | |
| 255 | return 0; |
| 256 | } |
| 257 | |
| 258 | static int vdc_nack(struct vdc_port *port, void *msgbuf) |
| 259 | { |
| 260 | /* XXX Implement me XXX */ |
| 261 | return 0; |
| 262 | } |
| 263 | |
| 264 | static void vdc_event(void *arg, int event) |
| 265 | { |
| 266 | struct vdc_port *port = arg; |
| 267 | struct vio_driver_state *vio = &port->vio; |
| 268 | unsigned long flags; |
| 269 | int err; |
| 270 | |
| 271 | spin_lock_irqsave(&vio->lock, flags); |
| 272 | |
| 273 | if (unlikely(event == LDC_EVENT_RESET || |
| 274 | event == LDC_EVENT_UP)) { |
| 275 | vio_link_state_change(vio, event); |
| 276 | spin_unlock_irqrestore(&vio->lock, flags); |
| 277 | return; |
| 278 | } |
| 279 | |
| 280 | if (unlikely(event != LDC_EVENT_DATA_READY)) { |
| 281 | printk(KERN_WARNING PFX "Unexpected LDC event %d\n", event); |
| 282 | spin_unlock_irqrestore(&vio->lock, flags); |
| 283 | return; |
| 284 | } |
| 285 | |
| 286 | err = 0; |
| 287 | while (1) { |
| 288 | union { |
| 289 | struct vio_msg_tag tag; |
| 290 | u64 raw[8]; |
| 291 | } msgbuf; |
| 292 | |
| 293 | err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf)); |
| 294 | if (unlikely(err < 0)) { |
| 295 | if (err == -ECONNRESET) |
| 296 | vio_conn_reset(vio); |
| 297 | break; |
| 298 | } |
| 299 | if (err == 0) |
| 300 | break; |
| 301 | viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n", |
| 302 | msgbuf.tag.type, |
| 303 | msgbuf.tag.stype, |
| 304 | msgbuf.tag.stype_env, |
| 305 | msgbuf.tag.sid); |
| 306 | err = vio_validate_sid(vio, &msgbuf.tag); |
| 307 | if (err < 0) |
| 308 | break; |
| 309 | |
| 310 | if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) { |
| 311 | if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) |
| 312 | err = vdc_ack(port, &msgbuf); |
| 313 | else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) |
| 314 | err = vdc_nack(port, &msgbuf); |
| 315 | else |
| 316 | err = vdc_handle_unknown(port, &msgbuf); |
| 317 | } else if (msgbuf.tag.type == VIO_TYPE_CTRL) { |
| 318 | err = vio_control_pkt_engine(vio, &msgbuf); |
| 319 | } else { |
| 320 | err = vdc_handle_unknown(port, &msgbuf); |
| 321 | } |
| 322 | if (err < 0) |
| 323 | break; |
| 324 | } |
| 325 | if (err < 0) |
| 326 | vdc_finish(&port->vio, err, WAITING_FOR_ANY); |
| 327 | spin_unlock_irqrestore(&vio->lock, flags); |
| 328 | } |
| 329 | |
| 330 | static int __vdc_tx_trigger(struct vdc_port *port) |
| 331 | { |
| 332 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
| 333 | struct vio_dring_data hdr = { |
| 334 | .tag = { |
| 335 | .type = VIO_TYPE_DATA, |
| 336 | .stype = VIO_SUBTYPE_INFO, |
| 337 | .stype_env = VIO_DRING_DATA, |
| 338 | .sid = vio_send_sid(&port->vio), |
| 339 | }, |
| 340 | .dring_ident = dr->ident, |
| 341 | .start_idx = dr->prod, |
| 342 | .end_idx = dr->prod, |
| 343 | }; |
| 344 | int err, delay; |
| 345 | |
| 346 | hdr.seq = dr->snd_nxt; |
| 347 | delay = 1; |
| 348 | do { |
| 349 | err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); |
| 350 | if (err > 0) { |
| 351 | dr->snd_nxt++; |
| 352 | break; |
| 353 | } |
| 354 | udelay(delay); |
| 355 | if ((delay <<= 1) > 128) |
| 356 | delay = 128; |
| 357 | } while (err == -EAGAIN); |
| 358 | |
| 359 | return err; |
| 360 | } |
| 361 | |
| 362 | static int __send_request(struct request *req) |
| 363 | { |
| 364 | struct vdc_port *port = req->rq_disk->private_data; |
| 365 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
| 366 | struct scatterlist sg[port->ring_cookies]; |
| 367 | struct vdc_req_entry *rqe; |
| 368 | struct vio_disk_desc *desc; |
| 369 | unsigned int map_perm; |
| 370 | int nsg, err, i; |
| 371 | u64 len; |
| 372 | u8 op; |
| 373 | |
| 374 | map_perm = LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO; |
| 375 | |
| 376 | if (rq_data_dir(req) == READ) { |
| 377 | map_perm |= LDC_MAP_W; |
| 378 | op = VD_OP_BREAD; |
| 379 | } else { |
| 380 | map_perm |= LDC_MAP_R; |
| 381 | op = VD_OP_BWRITE; |
| 382 | } |
| 383 | |
Jens Axboe | 45711f1 | 2007-10-22 21:19:53 +0200 | [diff] [blame] | 384 | sg_init_table(sg, port->ring_cookies); |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 385 | nsg = blk_rq_map_sg(req->q, req, sg); |
| 386 | |
| 387 | len = 0; |
| 388 | for (i = 0; i < nsg; i++) |
| 389 | len += sg[i].length; |
| 390 | |
| 391 | if (unlikely(vdc_tx_dring_avail(dr) < 1)) { |
| 392 | blk_stop_queue(port->disk->queue); |
| 393 | err = -ENOMEM; |
| 394 | goto out; |
| 395 | } |
| 396 | |
| 397 | desc = vio_dring_cur(dr); |
| 398 | |
| 399 | err = ldc_map_sg(port->vio.lp, sg, nsg, |
| 400 | desc->cookies, port->ring_cookies, |
| 401 | map_perm); |
| 402 | if (err < 0) { |
| 403 | printk(KERN_ERR PFX "ldc_map_sg() failure, err=%d.\n", err); |
| 404 | return err; |
| 405 | } |
| 406 | |
| 407 | rqe = &port->rq_arr[dr->prod]; |
| 408 | rqe->req = req; |
| 409 | |
| 410 | desc->hdr.ack = VIO_ACK_ENABLE; |
| 411 | desc->req_id = port->req_id; |
| 412 | desc->operation = op; |
| 413 | if (port->vdisk_type == VD_DISK_TYPE_DISK) { |
David S. Miller | 1bd4b28 | 2007-08-24 22:05:44 -0700 | [diff] [blame] | 414 | desc->slice = 0xff; |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 415 | } else { |
| 416 | desc->slice = 0; |
| 417 | } |
| 418 | desc->status = ~0; |
Tejun Heo | 83096eb | 2009-05-07 22:24:39 +0900 | [diff] [blame] | 419 | desc->offset = (blk_rq_pos(req) << 9) / port->vdisk_block_size; |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 420 | desc->size = len; |
| 421 | desc->ncookies = err; |
| 422 | |
| 423 | /* This has to be a non-SMP write barrier because we are writing |
| 424 | * to memory which is shared with the peer LDOM. |
| 425 | */ |
| 426 | wmb(); |
| 427 | desc->hdr.state = VIO_DESC_READY; |
| 428 | |
| 429 | err = __vdc_tx_trigger(port); |
| 430 | if (err < 0) { |
| 431 | printk(KERN_ERR PFX "vdc_tx_trigger() failure, err=%d\n", err); |
| 432 | } else { |
| 433 | port->req_id++; |
| 434 | dr->prod = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1); |
| 435 | } |
| 436 | out: |
| 437 | |
| 438 | return err; |
| 439 | } |
| 440 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 441 | static void do_vdc_request(struct request_queue *q) |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 442 | { |
| 443 | while (1) { |
Tejun Heo | 9934c8c | 2009-05-08 11:54:16 +0900 | [diff] [blame] | 444 | struct request *req = blk_fetch_request(q); |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 445 | |
| 446 | if (!req) |
| 447 | break; |
| 448 | |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 449 | if (__send_request(req) < 0) |
Tejun Heo | 0442085 | 2009-04-28 13:06:08 +0900 | [diff] [blame] | 450 | __blk_end_request_all(req, -EIO); |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 451 | } |
| 452 | } |
| 453 | |
| 454 | static int generic_request(struct vdc_port *port, u8 op, void *buf, int len) |
| 455 | { |
| 456 | struct vio_dring_state *dr; |
| 457 | struct vio_completion comp; |
| 458 | struct vio_disk_desc *desc; |
| 459 | unsigned int map_perm; |
| 460 | unsigned long flags; |
| 461 | int op_len, err; |
| 462 | void *req_buf; |
| 463 | |
| 464 | if (!(((u64)1 << ((u64)op - 1)) & port->operations)) |
| 465 | return -EOPNOTSUPP; |
| 466 | |
| 467 | switch (op) { |
| 468 | case VD_OP_BREAD: |
| 469 | case VD_OP_BWRITE: |
| 470 | default: |
| 471 | return -EINVAL; |
| 472 | |
| 473 | case VD_OP_FLUSH: |
| 474 | op_len = 0; |
| 475 | map_perm = 0; |
| 476 | break; |
| 477 | |
| 478 | case VD_OP_GET_WCE: |
| 479 | op_len = sizeof(u32); |
| 480 | map_perm = LDC_MAP_W; |
| 481 | break; |
| 482 | |
| 483 | case VD_OP_SET_WCE: |
| 484 | op_len = sizeof(u32); |
| 485 | map_perm = LDC_MAP_R; |
| 486 | break; |
| 487 | |
| 488 | case VD_OP_GET_VTOC: |
| 489 | op_len = sizeof(struct vio_disk_vtoc); |
| 490 | map_perm = LDC_MAP_W; |
| 491 | break; |
| 492 | |
| 493 | case VD_OP_SET_VTOC: |
| 494 | op_len = sizeof(struct vio_disk_vtoc); |
| 495 | map_perm = LDC_MAP_R; |
| 496 | break; |
| 497 | |
| 498 | case VD_OP_GET_DISKGEOM: |
| 499 | op_len = sizeof(struct vio_disk_geom); |
| 500 | map_perm = LDC_MAP_W; |
| 501 | break; |
| 502 | |
| 503 | case VD_OP_SET_DISKGEOM: |
| 504 | op_len = sizeof(struct vio_disk_geom); |
| 505 | map_perm = LDC_MAP_R; |
| 506 | break; |
| 507 | |
| 508 | case VD_OP_SCSICMD: |
| 509 | op_len = 16; |
| 510 | map_perm = LDC_MAP_RW; |
| 511 | break; |
| 512 | |
| 513 | case VD_OP_GET_DEVID: |
| 514 | op_len = sizeof(struct vio_disk_devid); |
| 515 | map_perm = LDC_MAP_W; |
| 516 | break; |
| 517 | |
| 518 | case VD_OP_GET_EFI: |
| 519 | case VD_OP_SET_EFI: |
| 520 | return -EOPNOTSUPP; |
| 521 | break; |
| 522 | }; |
| 523 | |
| 524 | map_perm |= LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO; |
| 525 | |
| 526 | op_len = (op_len + 7) & ~7; |
| 527 | req_buf = kzalloc(op_len, GFP_KERNEL); |
| 528 | if (!req_buf) |
| 529 | return -ENOMEM; |
| 530 | |
| 531 | if (len > op_len) |
| 532 | len = op_len; |
| 533 | |
| 534 | if (map_perm & LDC_MAP_R) |
| 535 | memcpy(req_buf, buf, len); |
| 536 | |
| 537 | spin_lock_irqsave(&port->vio.lock, flags); |
| 538 | |
| 539 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
| 540 | |
| 541 | /* XXX If we want to use this code generically we have to |
| 542 | * XXX handle TX ring exhaustion etc. |
| 543 | */ |
| 544 | desc = vio_dring_cur(dr); |
| 545 | |
| 546 | err = ldc_map_single(port->vio.lp, req_buf, op_len, |
| 547 | desc->cookies, port->ring_cookies, |
| 548 | map_perm); |
| 549 | if (err < 0) { |
| 550 | spin_unlock_irqrestore(&port->vio.lock, flags); |
| 551 | kfree(req_buf); |
| 552 | return err; |
| 553 | } |
| 554 | |
| 555 | init_completion(&comp.com); |
| 556 | comp.waiting_for = WAITING_FOR_GEN_CMD; |
| 557 | port->vio.cmp = ∁ |
| 558 | |
| 559 | desc->hdr.ack = VIO_ACK_ENABLE; |
| 560 | desc->req_id = port->req_id; |
| 561 | desc->operation = op; |
| 562 | desc->slice = 0; |
| 563 | desc->status = ~0; |
| 564 | desc->offset = 0; |
| 565 | desc->size = op_len; |
| 566 | desc->ncookies = err; |
| 567 | |
| 568 | /* This has to be a non-SMP write barrier because we are writing |
| 569 | * to memory which is shared with the peer LDOM. |
| 570 | */ |
| 571 | wmb(); |
| 572 | desc->hdr.state = VIO_DESC_READY; |
| 573 | |
| 574 | err = __vdc_tx_trigger(port); |
| 575 | if (err >= 0) { |
| 576 | port->req_id++; |
| 577 | dr->prod = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1); |
| 578 | spin_unlock_irqrestore(&port->vio.lock, flags); |
| 579 | |
| 580 | wait_for_completion(&comp.com); |
| 581 | err = comp.err; |
| 582 | } else { |
| 583 | port->vio.cmp = NULL; |
| 584 | spin_unlock_irqrestore(&port->vio.lock, flags); |
| 585 | } |
| 586 | |
| 587 | if (map_perm & LDC_MAP_W) |
| 588 | memcpy(buf, req_buf, len); |
| 589 | |
| 590 | kfree(req_buf); |
| 591 | |
| 592 | return err; |
| 593 | } |
| 594 | |
| 595 | static int __devinit vdc_alloc_tx_ring(struct vdc_port *port) |
| 596 | { |
| 597 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
| 598 | unsigned long len, entry_size; |
| 599 | int ncookies; |
| 600 | void *dring; |
| 601 | |
| 602 | entry_size = sizeof(struct vio_disk_desc) + |
| 603 | (sizeof(struct ldc_trans_cookie) * port->ring_cookies); |
| 604 | len = (VDC_TX_RING_SIZE * entry_size); |
| 605 | |
| 606 | ncookies = VIO_MAX_RING_COOKIES; |
| 607 | dring = ldc_alloc_exp_dring(port->vio.lp, len, |
| 608 | dr->cookies, &ncookies, |
| 609 | (LDC_MAP_SHADOW | |
| 610 | LDC_MAP_DIRECT | |
| 611 | LDC_MAP_RW)); |
| 612 | if (IS_ERR(dring)) |
| 613 | return PTR_ERR(dring); |
| 614 | |
| 615 | dr->base = dring; |
| 616 | dr->entry_size = entry_size; |
| 617 | dr->num_entries = VDC_TX_RING_SIZE; |
| 618 | dr->prod = dr->cons = 0; |
| 619 | dr->pending = VDC_TX_RING_SIZE; |
| 620 | dr->ncookies = ncookies; |
| 621 | |
| 622 | return 0; |
| 623 | } |
| 624 | |
| 625 | static void vdc_free_tx_ring(struct vdc_port *port) |
| 626 | { |
| 627 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
| 628 | |
| 629 | if (dr->base) { |
| 630 | ldc_free_exp_dring(port->vio.lp, dr->base, |
| 631 | (dr->entry_size * dr->num_entries), |
| 632 | dr->cookies, dr->ncookies); |
| 633 | dr->base = NULL; |
| 634 | dr->entry_size = 0; |
| 635 | dr->num_entries = 0; |
| 636 | dr->pending = 0; |
| 637 | dr->ncookies = 0; |
| 638 | } |
| 639 | } |
| 640 | |
| 641 | static int probe_disk(struct vdc_port *port) |
| 642 | { |
| 643 | struct vio_completion comp; |
| 644 | struct request_queue *q; |
| 645 | struct gendisk *g; |
| 646 | int err; |
| 647 | |
| 648 | init_completion(&comp.com); |
| 649 | comp.err = 0; |
| 650 | comp.waiting_for = WAITING_FOR_LINK_UP; |
| 651 | port->vio.cmp = ∁ |
| 652 | |
| 653 | vio_port_up(&port->vio); |
| 654 | |
| 655 | wait_for_completion(&comp.com); |
| 656 | if (comp.err) |
| 657 | return comp.err; |
| 658 | |
| 659 | err = generic_request(port, VD_OP_GET_VTOC, |
| 660 | &port->label, sizeof(port->label)); |
| 661 | if (err < 0) { |
| 662 | printk(KERN_ERR PFX "VD_OP_GET_VTOC returns error %d\n", err); |
| 663 | return err; |
| 664 | } |
| 665 | |
| 666 | err = generic_request(port, VD_OP_GET_DISKGEOM, |
| 667 | &port->geom, sizeof(port->geom)); |
| 668 | if (err < 0) { |
| 669 | printk(KERN_ERR PFX "VD_OP_GET_DISKGEOM returns " |
| 670 | "error %d\n", err); |
| 671 | return err; |
| 672 | } |
| 673 | |
| 674 | port->vdisk_size = ((u64)port->geom.num_cyl * |
| 675 | (u64)port->geom.num_hd * |
| 676 | (u64)port->geom.num_sec); |
| 677 | |
| 678 | q = blk_init_queue(do_vdc_request, &port->vio.lock); |
| 679 | if (!q) { |
| 680 | printk(KERN_ERR PFX "%s: Could not allocate queue.\n", |
| 681 | port->vio.name); |
| 682 | return -ENOMEM; |
| 683 | } |
| 684 | g = alloc_disk(1 << PARTITION_SHIFT); |
| 685 | if (!g) { |
| 686 | printk(KERN_ERR PFX "%s: Could not allocate gendisk.\n", |
| 687 | port->vio.name); |
| 688 | blk_cleanup_queue(q); |
| 689 | return -ENOMEM; |
| 690 | } |
| 691 | |
| 692 | port->disk = g; |
| 693 | |
| 694 | blk_queue_max_hw_segments(q, port->ring_cookies); |
| 695 | blk_queue_max_phys_segments(q, port->ring_cookies); |
| 696 | blk_queue_max_sectors(q, port->max_xfer_size); |
| 697 | g->major = vdc_major; |
David S. Miller | 91ba3c2 | 2007-07-18 15:15:45 -0700 | [diff] [blame] | 698 | g->first_minor = port->vio.vdev->dev_no << PARTITION_SHIFT; |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 699 | strcpy(g->disk_name, port->disk_name); |
| 700 | |
| 701 | g->fops = &vdc_fops; |
| 702 | g->queue = q; |
| 703 | g->private_data = port; |
| 704 | g->driverfs_dev = &port->vio.vdev->dev; |
| 705 | |
| 706 | set_capacity(g, port->vdisk_size); |
| 707 | |
| 708 | printk(KERN_INFO PFX "%s: %u sectors (%u MB)\n", |
| 709 | g->disk_name, |
| 710 | port->vdisk_size, (port->vdisk_size >> (20 - 9))); |
| 711 | |
| 712 | add_disk(g); |
| 713 | |
| 714 | return 0; |
| 715 | } |
| 716 | |
| 717 | static struct ldc_channel_config vdc_ldc_cfg = { |
| 718 | .event = vdc_event, |
| 719 | .mtu = 64, |
| 720 | .mode = LDC_MODE_UNRELIABLE, |
| 721 | }; |
| 722 | |
| 723 | static struct vio_driver_ops vdc_vio_ops = { |
| 724 | .send_attr = vdc_send_attr, |
| 725 | .handle_attr = vdc_handle_attr, |
| 726 | .handshake_complete = vdc_handshake_complete, |
| 727 | }; |
| 728 | |
Adrian Bunk | e30f98f | 2008-01-30 21:17:23 +0100 | [diff] [blame] | 729 | static void __devinit print_version(void) |
David S. Miller | 80dc35d | 2007-07-17 21:46:00 -0700 | [diff] [blame] | 730 | { |
| 731 | static int version_printed; |
| 732 | |
| 733 | if (version_printed++ == 0) |
| 734 | printk(KERN_INFO "%s", version); |
| 735 | } |
| 736 | |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 737 | static int __devinit vdc_port_probe(struct vio_dev *vdev, |
| 738 | const struct vio_device_id *id) |
| 739 | { |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 740 | struct mdesc_handle *hp; |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 741 | struct vdc_port *port; |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 742 | int err; |
| 743 | |
David S. Miller | 80dc35d | 2007-07-17 21:46:00 -0700 | [diff] [blame] | 744 | print_version(); |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 745 | |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 746 | hp = mdesc_grab(); |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 747 | |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 748 | err = -ENODEV; |
David S. Miller | 91ba3c2 | 2007-07-18 15:15:45 -0700 | [diff] [blame] | 749 | if ((vdev->dev_no << PARTITION_SHIFT) & ~(u64)MINORMASK) { |
Sam Ravnborg | 3f4528d | 2009-01-06 13:20:38 -0800 | [diff] [blame] | 750 | printk(KERN_ERR PFX "Port id [%llu] too large.\n", |
David S. Miller | 91ba3c2 | 2007-07-18 15:15:45 -0700 | [diff] [blame] | 751 | vdev->dev_no); |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 752 | goto err_out_release_mdesc; |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 753 | } |
| 754 | |
| 755 | port = kzalloc(sizeof(*port), GFP_KERNEL); |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 756 | err = -ENOMEM; |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 757 | if (!port) { |
| 758 | printk(KERN_ERR PFX "Cannot allocate vdc_port.\n"); |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 759 | goto err_out_release_mdesc; |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 760 | } |
| 761 | |
David S. Miller | 91ba3c2 | 2007-07-18 15:15:45 -0700 | [diff] [blame] | 762 | if (vdev->dev_no >= 26) |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 763 | snprintf(port->disk_name, sizeof(port->disk_name), |
| 764 | VDCBLK_NAME "%c%c", |
David S. Miller | 91ba3c2 | 2007-07-18 15:15:45 -0700 | [diff] [blame] | 765 | 'a' + ((int)vdev->dev_no / 26) - 1, |
| 766 | 'a' + ((int)vdev->dev_no % 26)); |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 767 | else |
| 768 | snprintf(port->disk_name, sizeof(port->disk_name), |
David S. Miller | 91ba3c2 | 2007-07-18 15:15:45 -0700 | [diff] [blame] | 769 | VDCBLK_NAME "%c", 'a' + ((int)vdev->dev_no % 26)); |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 770 | |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 771 | err = vio_driver_init(&port->vio, vdev, VDEV_DISK, |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 772 | vdc_versions, ARRAY_SIZE(vdc_versions), |
| 773 | &vdc_vio_ops, port->disk_name); |
| 774 | if (err) |
| 775 | goto err_out_free_port; |
| 776 | |
| 777 | port->vdisk_block_size = 512; |
| 778 | port->max_xfer_size = ((128 * 1024) / port->vdisk_block_size); |
| 779 | port->ring_cookies = ((port->max_xfer_size * |
| 780 | port->vdisk_block_size) / PAGE_SIZE) + 2; |
| 781 | |
| 782 | err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port); |
| 783 | if (err) |
| 784 | goto err_out_free_port; |
| 785 | |
| 786 | err = vdc_alloc_tx_ring(port); |
| 787 | if (err) |
| 788 | goto err_out_free_ldc; |
| 789 | |
| 790 | err = probe_disk(port); |
| 791 | if (err) |
| 792 | goto err_out_free_tx_ring; |
| 793 | |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 794 | dev_set_drvdata(&vdev->dev, port); |
| 795 | |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 796 | mdesc_release(hp); |
| 797 | |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 798 | return 0; |
| 799 | |
| 800 | err_out_free_tx_ring: |
| 801 | vdc_free_tx_ring(port); |
| 802 | |
| 803 | err_out_free_ldc: |
| 804 | vio_ldc_free(&port->vio); |
| 805 | |
| 806 | err_out_free_port: |
| 807 | kfree(port); |
| 808 | |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 809 | err_out_release_mdesc: |
| 810 | mdesc_release(hp); |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 811 | return err; |
| 812 | } |
| 813 | |
| 814 | static int vdc_port_remove(struct vio_dev *vdev) |
| 815 | { |
| 816 | struct vdc_port *port = dev_get_drvdata(&vdev->dev); |
| 817 | |
| 818 | if (port) { |
| 819 | del_timer_sync(&port->vio.timer); |
| 820 | |
| 821 | vdc_free_tx_ring(port); |
| 822 | vio_ldc_free(&port->vio); |
| 823 | |
| 824 | dev_set_drvdata(&vdev->dev, NULL); |
| 825 | |
| 826 | kfree(port); |
| 827 | } |
| 828 | return 0; |
| 829 | } |
| 830 | |
David S. Miller | 3d452e5 | 2008-09-01 01:48:52 -0700 | [diff] [blame] | 831 | static const struct vio_device_id vdc_port_match[] = { |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 832 | { |
| 833 | .type = "vdc-port", |
| 834 | }, |
| 835 | {}, |
| 836 | }; |
Fabio Massimo Di Nitto | da68e08 | 2007-07-18 14:35:23 -0700 | [diff] [blame] | 837 | MODULE_DEVICE_TABLE(vio, vdc_port_match); |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 838 | |
| 839 | static struct vio_driver vdc_port_driver = { |
| 840 | .id_table = vdc_port_match, |
| 841 | .probe = vdc_port_probe, |
| 842 | .remove = vdc_port_remove, |
| 843 | .driver = { |
| 844 | .name = "vdc_port", |
| 845 | .owner = THIS_MODULE, |
| 846 | } |
| 847 | }; |
| 848 | |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 849 | static int __init vdc_init(void) |
| 850 | { |
| 851 | int err; |
| 852 | |
| 853 | err = register_blkdev(0, VDCBLK_NAME); |
| 854 | if (err < 0) |
| 855 | goto out_err; |
| 856 | |
| 857 | vdc_major = err; |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 858 | |
| 859 | err = vio_register_driver(&vdc_port_driver); |
| 860 | if (err) |
David S. Miller | 80dc35d | 2007-07-17 21:46:00 -0700 | [diff] [blame] | 861 | goto out_unregister_blkdev; |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 862 | |
| 863 | return 0; |
| 864 | |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 865 | out_unregister_blkdev: |
| 866 | unregister_blkdev(vdc_major, VDCBLK_NAME); |
| 867 | vdc_major = 0; |
| 868 | |
| 869 | out_err: |
| 870 | return err; |
| 871 | } |
| 872 | |
| 873 | static void __exit vdc_exit(void) |
| 874 | { |
| 875 | vio_unregister_driver(&vdc_port_driver); |
David S. Miller | 667ef3c | 2007-07-16 04:03:56 -0700 | [diff] [blame] | 876 | unregister_blkdev(vdc_major, VDCBLK_NAME); |
| 877 | } |
| 878 | |
| 879 | module_init(vdc_init); |
| 880 | module_exit(vdc_exit); |