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cgroup: fix a race condition in manipulating tsk->cg_list
[linux-2.6/kmemtrace.git] / drivers / block / sx8.c
blobcd5674b63faffb7215c7f02358a1cb9791579913
1 /*
2 * sx8.c: Driver for Promise SATA SX8 looks-like-I2O hardware
3 *
4 * Copyright 2004-2005 Red Hat, Inc.
5 *
6 * Author/maintainer: Jeff Garzik <jgarzik@pobox.com>
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
10 * for more details.
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/pci.h>
17 #include <linux/slab.h>
18 #include <linux/spinlock.h>
19 #include <linux/blkdev.h>
20 #include <linux/sched.h>
21 #include <linux/interrupt.h>
22 #include <linux/compiler.h>
23 #include <linux/workqueue.h>
24 #include <linux/bitops.h>
25 #include <linux/delay.h>
26 #include <linux/time.h>
27 #include <linux/hdreg.h>
28 #include <linux/dma-mapping.h>
29 #include <linux/completion.h>
30 #include <linux/scatterlist.h>
31 #include <asm/io.h>
32 #include <asm/uaccess.h>
33
34 #if 0
35 #define CARM_DEBUG
36 #define CARM_VERBOSE_DEBUG
37 #else
38 #undef CARM_DEBUG
39 #undef CARM_VERBOSE_DEBUG
40 #endif
41 #undef CARM_NDEBUG
42
43 #define DRV_NAME "sx8"
44 #define DRV_VERSION "1.0"
45 #define PFX DRV_NAME ": "
46
47 MODULE_AUTHOR("Jeff Garzik");
48 MODULE_LICENSE("GPL");
49 MODULE_DESCRIPTION("Promise SATA SX8 block driver");
50 MODULE_VERSION(DRV_VERSION);
51
52 /*
53 * SX8 hardware has a single message queue for all ATA ports.
54 * When this driver was written, the hardware (firmware?) would
55 * corrupt data eventually, if more than one request was outstanding.
56 * As one can imagine, having 8 ports bottlenecking on a single
57 * command hurts performance.
58 *
59 * Based on user reports, later versions of the hardware (firmware?)
60 * seem to be able to survive with more than one command queued.
61 *
62 * Therefore, we default to the safe option -- 1 command -- but
63 * allow the user to increase this.
64 *
65 * SX8 should be able to support up to ~60 queued commands (CARM_MAX_REQ),
66 * but problems seem to occur when you exceed ~30, even on newer hardware.
67 */
68 static int max_queue = 1;
69 module_param(max_queue, int, 0444);
70 MODULE_PARM_DESC(max_queue, "Maximum number of queued commands. (min==1, max==30, safe==1)");
71
72
73 #define NEXT_RESP(idx) ((idx + 1) % RMSG_Q_LEN)
74
75 /* 0xf is just arbitrary, non-zero noise; this is sorta like poisoning */
76 #define TAG_ENCODE(tag) (((tag) << 16) | 0xf)
77 #define TAG_DECODE(tag) (((tag) >> 16) & 0x1f)
78 #define TAG_VALID(tag) ((((tag) & 0xf) == 0xf) && (TAG_DECODE(tag) < 32))
79
80 /* note: prints function name for you */
81 #ifdef CARM_DEBUG
82 #define DPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
83 #ifdef CARM_VERBOSE_DEBUG
84 #define VPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
85 #else
86 #define VPRINTK(fmt, args...)
87 #endif /* CARM_VERBOSE_DEBUG */
88 #else
89 #define DPRINTK(fmt, args...)
90 #define VPRINTK(fmt, args...)
91 #endif /* CARM_DEBUG */
92
93 #ifdef CARM_NDEBUG
94 #define assert(expr)
95 #else
96 #define assert(expr) \
97 if(unlikely(!(expr))) { \
98 printk(KERN_ERR "Assertion failed! %s,%s,%s,line=%d\n", \
99 #expr,__FILE__,__FUNCTION__,__LINE__); \
100 }
101 #endif
102
103 /* defines only for the constants which don't work well as enums */
104 struct carm_host;
105
106 enum {
107 /* adapter-wide limits */
108 CARM_MAX_PORTS = 8,
109 CARM_SHM_SIZE = (4096 << 7),
110 CARM_MINORS_PER_MAJOR = 256 / CARM_MAX_PORTS,
111 CARM_MAX_WAIT_Q = CARM_MAX_PORTS + 1,
112
113 /* command message queue limits */
114 CARM_MAX_REQ = 64, /* max command msgs per host */
115 CARM_MSG_LOW_WATER = (CARM_MAX_REQ / 4), /* refill mark */
116
117 /* S/G limits, host-wide and per-request */
118 CARM_MAX_REQ_SG = 32, /* max s/g entries per request */
119 CARM_MAX_HOST_SG = 600, /* max s/g entries per host */
120 CARM_SG_LOW_WATER = (CARM_MAX_HOST_SG / 4), /* re-fill mark */
121
122 /* hardware registers */
123 CARM_IHQP = 0x1c,
124 CARM_INT_STAT = 0x10, /* interrupt status */
125 CARM_INT_MASK = 0x14, /* interrupt mask */
126 CARM_HMUC = 0x18, /* host message unit control */
127 RBUF_ADDR_LO = 0x20, /* response msg DMA buf low 32 bits */
128 RBUF_ADDR_HI = 0x24, /* response msg DMA buf high 32 bits */
129 RBUF_BYTE_SZ = 0x28,
130 CARM_RESP_IDX = 0x2c,
131 CARM_CMS0 = 0x30, /* command message size reg 0 */
132 CARM_LMUC = 0x48,
133 CARM_HMPHA = 0x6c,
134 CARM_INITC = 0xb5,
135
136 /* bits in CARM_INT_{STAT,MASK} */
137 INT_RESERVED = 0xfffffff0,
138 INT_WATCHDOG = (1 << 3), /* watchdog timer */
139 INT_Q_OVERFLOW = (1 << 2), /* cmd msg q overflow */
140 INT_Q_AVAILABLE = (1 << 1), /* cmd msg q has free space */
141 INT_RESPONSE = (1 << 0), /* response msg available */
142 INT_ACK_MASK = INT_WATCHDOG | INT_Q_OVERFLOW,
143 INT_DEF_MASK = INT_RESERVED | INT_Q_OVERFLOW |
144 INT_RESPONSE,
145
146 /* command messages, and related register bits */
147 CARM_HAVE_RESP = 0x01,
148 CARM_MSG_READ = 1,
149 CARM_MSG_WRITE = 2,
150 CARM_MSG_VERIFY = 3,
151 CARM_MSG_GET_CAPACITY = 4,
152 CARM_MSG_FLUSH = 5,
153 CARM_MSG_IOCTL = 6,
154 CARM_MSG_ARRAY = 8,
155 CARM_MSG_MISC = 9,
156 CARM_CME = (1 << 2),
157 CARM_RME = (1 << 1),
158 CARM_WZBC = (1 << 0),
159 CARM_RMI = (1 << 0),
160 CARM_Q_FULL = (1 << 3),
161 CARM_MSG_SIZE = 288,
162 CARM_Q_LEN = 48,
163
164 /* CARM_MSG_IOCTL messages */
165 CARM_IOC_SCAN_CHAN = 5, /* scan channels for devices */
166 CARM_IOC_GET_TCQ = 13, /* get tcq/ncq depth */
167 CARM_IOC_SET_TCQ = 14, /* set tcq/ncq depth */
168
169 IOC_SCAN_CHAN_NODEV = 0x1f,
170 IOC_SCAN_CHAN_OFFSET = 0x40,
171
172 /* CARM_MSG_ARRAY messages */
173 CARM_ARRAY_INFO = 0,
174
175 ARRAY_NO_EXIST = (1 << 31),
176
177 /* response messages */
178 RMSG_SZ = 8, /* sizeof(struct carm_response) */
179 RMSG_Q_LEN = 48, /* resp. msg list length */
180 RMSG_OK = 1, /* bit indicating msg was successful */
181 /* length of entire resp. msg buffer */
182 RBUF_LEN = RMSG_SZ * RMSG_Q_LEN,
183
184 PDC_SHM_SIZE = (4096 << 7), /* length of entire h/w buffer */
185
186 /* CARM_MSG_MISC messages */
187 MISC_GET_FW_VER = 2,
188 MISC_ALLOC_MEM = 3,
189 MISC_SET_TIME = 5,
190
191 /* MISC_GET_FW_VER feature bits */
192 FW_VER_4PORT = (1 << 2), /* 1=4 ports, 0=8 ports */
193 FW_VER_NON_RAID = (1 << 1), /* 1=non-RAID firmware, 0=RAID */
194 FW_VER_ZCR = (1 << 0), /* zero channel RAID (whatever that is) */
195
196 /* carm_host flags */
197 FL_NON_RAID = FW_VER_NON_RAID,
198 FL_4PORT = FW_VER_4PORT,
199 FL_FW_VER_MASK = (FW_VER_NON_RAID | FW_VER_4PORT),
200 FL_DAC = (1 << 16),
201 FL_DYN_MAJOR = (1 << 17),
202 };
203
204 enum {
205 CARM_SG_BOUNDARY = 0xffffUL, /* s/g segment boundary */
206 };
207
208 enum scatter_gather_types {
209 SGT_32BIT = 0,
210 SGT_64BIT = 1,
211 };
212
213 enum host_states {
214 HST_INVALID, /* invalid state; never used */
215 HST_ALLOC_BUF, /* setting up master SHM area */
216 HST_ERROR, /* we never leave here */
217 HST_PORT_SCAN, /* start dev scan */
218 HST_DEV_SCAN_START, /* start per-device probe */
219 HST_DEV_SCAN, /* continue per-device probe */
220 HST_DEV_ACTIVATE, /* activate devices we found */
221 HST_PROBE_FINISHED, /* probe is complete */
222 HST_PROBE_START, /* initiate probe */
223 HST_SYNC_TIME, /* tell firmware what time it is */
224 HST_GET_FW_VER, /* get firmware version, adapter port cnt */
225 };
226
227 #ifdef CARM_DEBUG
228 static const char *state_name[] = {
229 "HST_INVALID",
230 "HST_ALLOC_BUF",
231 "HST_ERROR",
232 "HST_PORT_SCAN",
233 "HST_DEV_SCAN_START",
234 "HST_DEV_SCAN",
235 "HST_DEV_ACTIVATE",
236 "HST_PROBE_FINISHED",
237 "HST_PROBE_START",
238 "HST_SYNC_TIME",
239 "HST_GET_FW_VER",
240 };
241 #endif
242
243 struct carm_port {
244 unsigned int port_no;
245 struct gendisk *disk;
246 struct carm_host *host;
247
248 /* attached device characteristics */
249 u64 capacity;
250 char name[41];
251 u16 dev_geom_head;
252 u16 dev_geom_sect;
253 u16 dev_geom_cyl;
254 };
255
256 struct carm_request {
257 unsigned int tag;
258 int n_elem;
259 unsigned int msg_type;
260 unsigned int msg_subtype;
261 unsigned int msg_bucket;
262 struct request *rq;
263 struct carm_port *port;
264 struct scatterlist sg[CARM_MAX_REQ_SG];
265 };
266
267 struct carm_host {
268 unsigned long flags;
269 void __iomem *mmio;
270 void *shm;
271 dma_addr_t shm_dma;
272
273 int major;
274 int id;
275 char name[32];
276
277 spinlock_t lock;
278 struct pci_dev *pdev;
279 unsigned int state;
280 u32 fw_ver;
281
282 struct request_queue *oob_q;
283 unsigned int n_oob;
284
285 unsigned int hw_sg_used;
286
287 unsigned int resp_idx;
288
289 unsigned int wait_q_prod;
290 unsigned int wait_q_cons;
291 struct request_queue *wait_q[CARM_MAX_WAIT_Q];
292
293 unsigned int n_msgs;
294 u64 msg_alloc;
295 struct carm_request req[CARM_MAX_REQ];
296 void *msg_base;
297 dma_addr_t msg_dma;
298
299 int cur_scan_dev;
300 unsigned long dev_active;
301 unsigned long dev_present;
302 struct carm_port port[CARM_MAX_PORTS];
303
304 struct work_struct fsm_task;
305
306 struct completion probe_comp;
307 };
308
309 struct carm_response {
310 __le32 ret_handle;
311 __le32 status;
312 } __attribute__((packed));
313
314 struct carm_msg_sg {
315 __le32 start;
316 __le32 len;
317 } __attribute__((packed));
318
319 struct carm_msg_rw {
320 u8 type;
321 u8 id;
322 u8 sg_count;
323 u8 sg_type;
324 __le32 handle;
325 __le32 lba;
326 __le16 lba_count;
327 __le16 lba_high;
328 struct carm_msg_sg sg[32];
329 } __attribute__((packed));
330
331 struct carm_msg_allocbuf {
332 u8 type;
333 u8 subtype;
334 u8 n_sg;
335 u8 sg_type;
336 __le32 handle;
337 __le32 addr;
338 __le32 len;
339 __le32 evt_pool;
340 __le32 n_evt;
341 __le32 rbuf_pool;
342 __le32 n_rbuf;
343 __le32 msg_pool;
344 __le32 n_msg;
345 struct carm_msg_sg sg[8];
346 } __attribute__((packed));
347
348 struct carm_msg_ioctl {
349 u8 type;
350 u8 subtype;
351 u8 array_id;
352 u8 reserved1;
353 __le32 handle;
354 __le32 data_addr;
355 u32 reserved2;
356 } __attribute__((packed));
357
358 struct carm_msg_sync_time {
359 u8 type;
360 u8 subtype;
361 u16 reserved1;
362 __le32 handle;
363 u32 reserved2;
364 __le32 timestamp;
365 } __attribute__((packed));
366
367 struct carm_msg_get_fw_ver {
368 u8 type;
369 u8 subtype;
370 u16 reserved1;
371 __le32 handle;
372 __le32 data_addr;
373 u32 reserved2;
374 } __attribute__((packed));
375
376 struct carm_fw_ver {
377 __le32 version;
378 u8 features;
379 u8 reserved1;
380 u16 reserved2;
381 } __attribute__((packed));
382
383 struct carm_array_info {
384 __le32 size;
385
386 __le16 size_hi;
387 __le16 stripe_size;
388
389 __le32 mode;
390
391 __le16 stripe_blk_sz;
392 __le16 reserved1;
393
394 __le16 cyl;
395 __le16 head;
396
397 __le16 sect;
398 u8 array_id;
399 u8 reserved2;
400
401 char name[40];
402
403 __le32 array_status;
404
405 /* device list continues beyond this point? */
406 } __attribute__((packed));
407
408 static int carm_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
409 static void carm_remove_one (struct pci_dev *pdev);
410 static int carm_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo);
411
412 static struct pci_device_id carm_pci_tbl[] = {
413 { PCI_VENDOR_ID_PROMISE, 0x8000, PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
414 { PCI_VENDOR_ID_PROMISE, 0x8002, PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
415 { } /* terminate list */
416 };
417 MODULE_DEVICE_TABLE(pci, carm_pci_tbl);
418
419 static struct pci_driver carm_driver = {
420 .name = DRV_NAME,
421 .id_table = carm_pci_tbl,
422 .probe = carm_init_one,
423 .remove = carm_remove_one,
424 };
425
426 static struct block_device_operations carm_bd_ops = {
427 .owner = THIS_MODULE,
428 .getgeo = carm_bdev_getgeo,
429 };
430
431 static unsigned int carm_host_id;
432 static unsigned long carm_major_alloc;
433
434
435
436 static int carm_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo)
437 {
438 struct carm_port *port = bdev->bd_disk->private_data;
439
440 geo->heads = (u8) port->dev_geom_head;
441 geo->sectors = (u8) port->dev_geom_sect;
442 geo->cylinders = port->dev_geom_cyl;
443 return 0;
444 }
445
446 static const u32 msg_sizes[] = { 32, 64, 128, CARM_MSG_SIZE };
447
448 static inline int carm_lookup_bucket(u32 msg_size)
449 {
450 int i;
451
452 for (i = 0; i < ARRAY_SIZE(msg_sizes); i++)
453 if (msg_size <= msg_sizes[i])
454 return i;
455
456 return -ENOENT;
457 }
458
459 static void carm_init_buckets(void __iomem *mmio)
460 {
461 unsigned int i;
462
463 for (i = 0; i < ARRAY_SIZE(msg_sizes); i++)
464 writel(msg_sizes[i], mmio + CARM_CMS0 + (4 * i));
465 }
466
467 static inline void *carm_ref_msg(struct carm_host *host,
468 unsigned int msg_idx)
469 {
470 return host->msg_base + (msg_idx * CARM_MSG_SIZE);
471 }
472
473 static inline dma_addr_t carm_ref_msg_dma(struct carm_host *host,
474 unsigned int msg_idx)
475 {
476 return host->msg_dma + (msg_idx * CARM_MSG_SIZE);
477 }
478
479 static int carm_send_msg(struct carm_host *host,
480 struct carm_request *crq)
481 {
482 void __iomem *mmio = host->mmio;
483 u32 msg = (u32) carm_ref_msg_dma(host, crq->tag);
484 u32 cm_bucket = crq->msg_bucket;
485 u32 tmp;
486 int rc = 0;
487
488 VPRINTK("ENTER\n");
489
490 tmp = readl(mmio + CARM_HMUC);
491 if (tmp & CARM_Q_FULL) {
492 #if 0
493 tmp = readl(mmio + CARM_INT_MASK);
494 tmp |= INT_Q_AVAILABLE;
495 writel(tmp, mmio + CARM_INT_MASK);
496 readl(mmio + CARM_INT_MASK); /* flush */
497 #endif
498 DPRINTK("host msg queue full\n");
499 rc = -EBUSY;
500 } else {
501 writel(msg | (cm_bucket << 1), mmio + CARM_IHQP);
502 readl(mmio + CARM_IHQP); /* flush */
503 }
504
505 return rc;
506 }
507
508 static struct carm_request *carm_get_request(struct carm_host *host)
509 {
510 unsigned int i;
511
512 /* obey global hardware limit on S/G entries */
513 if (host->hw_sg_used >= (CARM_MAX_HOST_SG - CARM_MAX_REQ_SG))
514 return NULL;
515
516 for (i = 0; i < max_queue; i++)
517 if ((host->msg_alloc & (1ULL << i)) == 0) {
518 struct carm_request *crq = &host->req[i];
519 crq->port = NULL;
520 crq->n_elem = 0;
521
522 host->msg_alloc |= (1ULL << i);
523 host->n_msgs++;
524
525 assert(host->n_msgs <= CARM_MAX_REQ);
526 sg_init_table(crq->sg, CARM_MAX_REQ_SG);
527 return crq;
528 }
529
530 DPRINTK("no request available, returning NULL\n");
531 return NULL;
532 }
533
534 static int carm_put_request(struct carm_host *host, struct carm_request *crq)
535 {
536 assert(crq->tag < max_queue);
537
538 if (unlikely((host->msg_alloc & (1ULL << crq->tag)) == 0))
539 return -EINVAL; /* tried to clear a tag that was not active */
540
541 assert(host->hw_sg_used >= crq->n_elem);
542
543 host->msg_alloc &= ~(1ULL << crq->tag);
544 host->hw_sg_used -= crq->n_elem;
545 host->n_msgs--;
546
547 return 0;
548 }
549
550 static struct carm_request *carm_get_special(struct carm_host *host)
551 {
552 unsigned long flags;
553 struct carm_request *crq = NULL;
554 struct request *rq;
555 int tries = 5000;
556
557 while (tries-- > 0) {
558 spin_lock_irqsave(&host->lock, flags);
559 crq = carm_get_request(host);
560 spin_unlock_irqrestore(&host->lock, flags);
561
562 if (crq)
563 break;
564 msleep(10);
565 }
566
567 if (!crq)
568 return NULL;
569
570 rq = blk_get_request(host->oob_q, WRITE /* bogus */, GFP_KERNEL);
571 if (!rq) {
572 spin_lock_irqsave(&host->lock, flags);
573 carm_put_request(host, crq);
574 spin_unlock_irqrestore(&host->lock, flags);
575 return NULL;
576 }
577
578 crq->rq = rq;
579 return crq;
580 }
581
582 static int carm_array_info (struct carm_host *host, unsigned int array_idx)
583 {
584 struct carm_msg_ioctl *ioc;
585 unsigned int idx;
586 u32 msg_data;
587 dma_addr_t msg_dma;
588 struct carm_request *crq;
589 int rc;
590
591 crq = carm_get_special(host);
592 if (!crq) {
593 rc = -ENOMEM;
594 goto err_out;
595 }
596
597 idx = crq->tag;
598
599 ioc = carm_ref_msg(host, idx);
600 msg_dma = carm_ref_msg_dma(host, idx);
601 msg_data = (u32) (msg_dma + sizeof(struct carm_array_info));
602
603 crq->msg_type = CARM_MSG_ARRAY;
604 crq->msg_subtype = CARM_ARRAY_INFO;
605 rc = carm_lookup_bucket(sizeof(struct carm_msg_ioctl) +
606 sizeof(struct carm_array_info));
607 BUG_ON(rc < 0);
608 crq->msg_bucket = (u32) rc;
609
610 memset(ioc, 0, sizeof(*ioc));
611 ioc->type = CARM_MSG_ARRAY;
612 ioc->subtype = CARM_ARRAY_INFO;
613 ioc->array_id = (u8) array_idx;
614 ioc->handle = cpu_to_le32(TAG_ENCODE(idx));
615 ioc->data_addr = cpu_to_le32(msg_data);
616
617 spin_lock_irq(&host->lock);
618 assert(host->state == HST_DEV_SCAN_START ||
619 host->state == HST_DEV_SCAN);
620 spin_unlock_irq(&host->lock);
621
622 DPRINTK("blk_insert_request, tag == %u\n", idx);
623 blk_insert_request(host->oob_q, crq->rq, 1, crq);
624
625 return 0;
626
627 err_out:
628 spin_lock_irq(&host->lock);
629 host->state = HST_ERROR;
630 spin_unlock_irq(&host->lock);
631 return rc;
632 }
633
634 typedef unsigned int (*carm_sspc_t)(struct carm_host *, unsigned int, void *);
635
636 static int carm_send_special (struct carm_host *host, carm_sspc_t func)
637 {
638 struct carm_request *crq;
639 struct carm_msg_ioctl *ioc;
640 void *mem;
641 unsigned int idx, msg_size;
642 int rc;
643
644 crq = carm_get_special(host);
645 if (!crq)
646 return -ENOMEM;
647
648 idx = crq->tag;
649
650 mem = carm_ref_msg(host, idx);
651
652 msg_size = func(host, idx, mem);
653
654 ioc = mem;
655 crq->msg_type = ioc->type;
656 crq->msg_subtype = ioc->subtype;
657 rc = carm_lookup_bucket(msg_size);
658 BUG_ON(rc < 0);
659 crq->msg_bucket = (u32) rc;
660
661 DPRINTK("blk_insert_request, tag == %u\n", idx);
662 blk_insert_request(host->oob_q, crq->rq, 1, crq);
663
664 return 0;
665 }
666
667 static unsigned int carm_fill_sync_time(struct carm_host *host,
668 unsigned int idx, void *mem)
669 {
670 struct timeval tv;
671 struct carm_msg_sync_time *st = mem;
672
673 do_gettimeofday(&tv);
674
675 memset(st, 0, sizeof(*st));
676 st->type = CARM_MSG_MISC;
677 st->subtype = MISC_SET_TIME;
678 st->handle = cpu_to_le32(TAG_ENCODE(idx));
679 st->timestamp = cpu_to_le32(tv.tv_sec);
680
681 return sizeof(struct carm_msg_sync_time);
682 }
683
684 static unsigned int carm_fill_alloc_buf(struct carm_host *host,
685 unsigned int idx, void *mem)
686 {
687 struct carm_msg_allocbuf *ab = mem;
688
689 memset(ab, 0, sizeof(*ab));
690 ab->type = CARM_MSG_MISC;
691 ab->subtype = MISC_ALLOC_MEM;
692 ab->handle = cpu_to_le32(TAG_ENCODE(idx));
693 ab->n_sg = 1;
694 ab->sg_type = SGT_32BIT;
695 ab->addr = cpu_to_le32(host->shm_dma + (PDC_SHM_SIZE >> 1));
696 ab->len = cpu_to_le32(PDC_SHM_SIZE >> 1);
697 ab->evt_pool = cpu_to_le32(host->shm_dma + (16 * 1024));
698 ab->n_evt = cpu_to_le32(1024);
699 ab->rbuf_pool = cpu_to_le32(host->shm_dma);
700 ab->n_rbuf = cpu_to_le32(RMSG_Q_LEN);
701 ab->msg_pool = cpu_to_le32(host->shm_dma + RBUF_LEN);
702 ab->n_msg = cpu_to_le32(CARM_Q_LEN);
703 ab->sg[0].start = cpu_to_le32(host->shm_dma + (PDC_SHM_SIZE >> 1));
704 ab->sg[0].len = cpu_to_le32(65536);
705
706 return sizeof(struct carm_msg_allocbuf);
707 }
708
709 static unsigned int carm_fill_scan_channels(struct carm_host *host,
710 unsigned int idx, void *mem)
711 {
712 struct carm_msg_ioctl *ioc = mem;
713 u32 msg_data = (u32) (carm_ref_msg_dma(host, idx) +
714 IOC_SCAN_CHAN_OFFSET);
715
716 memset(ioc, 0, sizeof(*ioc));
717 ioc->type = CARM_MSG_IOCTL;
718 ioc->subtype = CARM_IOC_SCAN_CHAN;
719 ioc->handle = cpu_to_le32(TAG_ENCODE(idx));
720 ioc->data_addr = cpu_to_le32(msg_data);
721
722 /* fill output data area with "no device" default values */
723 mem += IOC_SCAN_CHAN_OFFSET;
724 memset(mem, IOC_SCAN_CHAN_NODEV, CARM_MAX_PORTS);
725
726 return IOC_SCAN_CHAN_OFFSET + CARM_MAX_PORTS;
727 }
728
729 static unsigned int carm_fill_get_fw_ver(struct carm_host *host,
730 unsigned int idx, void *mem)
731 {
732 struct carm_msg_get_fw_ver *ioc = mem;
733 u32 msg_data = (u32) (carm_ref_msg_dma(host, idx) + sizeof(*ioc));
734
735 memset(ioc, 0, sizeof(*ioc));
736 ioc->type = CARM_MSG_MISC;
737 ioc->subtype = MISC_GET_FW_VER;
738 ioc->handle = cpu_to_le32(TAG_ENCODE(idx));
739 ioc->data_addr = cpu_to_le32(msg_data);
740
741 return sizeof(struct carm_msg_get_fw_ver) +
742 sizeof(struct carm_fw_ver);
743 }
744
745 static inline void carm_end_request_queued(struct carm_host *host,
746 struct carm_request *crq,
747 int error)
748 {
749 struct request *req = crq->rq;
750 int rc;
751
752 rc = __blk_end_request(req, error, blk_rq_bytes(req));
753 assert(rc == 0);
754
755 rc = carm_put_request(host, crq);
756 assert(rc == 0);
757 }
758
759 static inline void carm_push_q (struct carm_host *host, struct request_queue *q)
760 {
761 unsigned int idx = host->wait_q_prod % CARM_MAX_WAIT_Q;
762
763 blk_stop_queue(q);
764 VPRINTK("STOPPED QUEUE %p\n", q);
765
766 host->wait_q[idx] = q;
767 host->wait_q_prod++;
768 BUG_ON(host->wait_q_prod == host->wait_q_cons); /* overrun */
769 }
770
771 static inline struct request_queue *carm_pop_q(struct carm_host *host)
772 {
773 unsigned int idx;
774
775 if (host->wait_q_prod == host->wait_q_cons)
776 return NULL;
777
778 idx = host->wait_q_cons % CARM_MAX_WAIT_Q;
779 host->wait_q_cons++;
780
781 return host->wait_q[idx];
782 }
783
784 static inline void carm_round_robin(struct carm_host *host)
785 {
786 struct request_queue *q = carm_pop_q(host);
787 if (q) {
788 blk_start_queue(q);
789 VPRINTK("STARTED QUEUE %p\n", q);
790 }
791 }
792
793 static inline void carm_end_rq(struct carm_host *host, struct carm_request *crq,
794 int error)
795 {
796 carm_end_request_queued(host, crq, error);
797 if (max_queue == 1)
798 carm_round_robin(host);
799 else if ((host->n_msgs <= CARM_MSG_LOW_WATER) &&
800 (host->hw_sg_used <= CARM_SG_LOW_WATER)) {
801 carm_round_robin(host);
802 }
803 }
804
805 static void carm_oob_rq_fn(struct request_queue *q)
806 {
807 struct carm_host *host = q->queuedata;
808 struct carm_request *crq;
809 struct request *rq;
810 int rc;
811
812 while (1) {
813 DPRINTK("get req\n");
814 rq = elv_next_request(q);
815 if (!rq)
816 break;
817
818 blkdev_dequeue_request(rq);
819
820 crq = rq->special;
821 assert(crq != NULL);
822 assert(crq->rq == rq);
823
824 crq->n_elem = 0;
825
826 DPRINTK("send req\n");
827 rc = carm_send_msg(host, crq);
828 if (rc) {
829 blk_requeue_request(q, rq);
830 carm_push_q(host, q);
831 return; /* call us again later, eventually */
832 }
833 }
834 }
835
836 static void carm_rq_fn(struct request_queue *q)
837 {
838 struct carm_port *port = q->queuedata;
839 struct carm_host *host = port->host;
840 struct carm_msg_rw *msg;
841 struct carm_request *crq;
842 struct request *rq;
843 struct scatterlist *sg;
844 int writing = 0, pci_dir, i, n_elem, rc;
845 u32 tmp;
846 unsigned int msg_size;
847
848 queue_one_request:
849 VPRINTK("get req\n");
850 rq = elv_next_request(q);
851 if (!rq)
852 return;
853
854 crq = carm_get_request(host);
855 if (!crq) {
856 carm_push_q(host, q);
857 return; /* call us again later, eventually */
858 }
859 crq->rq = rq;
860
861 blkdev_dequeue_request(rq);
862
863 if (rq_data_dir(rq) == WRITE) {
864 writing = 1;
865 pci_dir = PCI_DMA_TODEVICE;
866 } else {
867 pci_dir = PCI_DMA_FROMDEVICE;
868 }
869
870 /* get scatterlist from block layer */
871 sg = &crq->sg[0];
872 n_elem = blk_rq_map_sg(q, rq, sg);
873 if (n_elem <= 0) {
874 carm_end_rq(host, crq, -EIO);
875 return; /* request with no s/g entries? */
876 }
877
878 /* map scatterlist to PCI bus addresses */
879 n_elem = pci_map_sg(host->pdev, sg, n_elem, pci_dir);
880 if (n_elem <= 0) {
881 carm_end_rq(host, crq, -EIO);
882 return; /* request with no s/g entries? */
883 }
884 crq->n_elem = n_elem;
885 crq->port = port;
886 host->hw_sg_used += n_elem;
887
888 /*
889 * build read/write message
890 */
891
892 VPRINTK("build msg\n");
893 msg = (struct carm_msg_rw *) carm_ref_msg(host, crq->tag);
894
895 if (writing) {
896 msg->type = CARM_MSG_WRITE;
897 crq->msg_type = CARM_MSG_WRITE;
898 } else {
899 msg->type = CARM_MSG_READ;
900 crq->msg_type = CARM_MSG_READ;
901 }
902
903 msg->id = port->port_no;
904 msg->sg_count = n_elem;
905 msg->sg_type = SGT_32BIT;
906 msg->handle = cpu_to_le32(TAG_ENCODE(crq->tag));
907 msg->lba = cpu_to_le32(rq->sector & 0xffffffff);
908 tmp = (rq->sector >> 16) >> 16;
909 msg->lba_high = cpu_to_le16( (u16) tmp );
910 msg->lba_count = cpu_to_le16(rq->nr_sectors);
911
912 msg_size = sizeof(struct carm_msg_rw) - sizeof(msg->sg);
913 for (i = 0; i < n_elem; i++) {
914 struct carm_msg_sg *carm_sg = &msg->sg[i];
915 carm_sg->start = cpu_to_le32(sg_dma_address(&crq->sg[i]));
916 carm_sg->len = cpu_to_le32(sg_dma_len(&crq->sg[i]));
917 msg_size += sizeof(struct carm_msg_sg);
918 }
919
920 rc = carm_lookup_bucket(msg_size);
921 BUG_ON(rc < 0);
922 crq->msg_bucket = (u32) rc;
923
924 /*
925 * queue read/write message to hardware
926 */
927
928 VPRINTK("send msg, tag == %u\n", crq->tag);
929 rc = carm_send_msg(host, crq);
930 if (rc) {
931 carm_put_request(host, crq);
932 blk_requeue_request(q, rq);
933 carm_push_q(host, q);
934 return; /* call us again later, eventually */
935 }
936
937 goto queue_one_request;
938 }
939
940 static void carm_handle_array_info(struct carm_host *host,
941 struct carm_request *crq, u8 *mem,
942 int error)
943 {
944 struct carm_port *port;
945 u8 *msg_data = mem + sizeof(struct carm_array_info);
946 struct carm_array_info *desc = (struct carm_array_info *) msg_data;
947 u64 lo, hi;
948 int cur_port;
949 size_t slen;
950
951 DPRINTK("ENTER\n");
952
953 carm_end_rq(host, crq, error);
954
955 if (error)
956 goto out;
957 if (le32_to_cpu(desc->array_status) & ARRAY_NO_EXIST)
958 goto out;
959
960 cur_port = host->cur_scan_dev;
961
962 /* should never occur */
963 if ((cur_port < 0) || (cur_port >= CARM_MAX_PORTS)) {
964 printk(KERN_ERR PFX "BUG: cur_scan_dev==%d, array_id==%d\n",
965 cur_port, (int) desc->array_id);
966 goto out;
967 }
968
969 port = &host->port[cur_port];
970
971 lo = (u64) le32_to_cpu(desc->size);
972 hi = (u64) le16_to_cpu(desc->size_hi);
973
974 port->capacity = lo | (hi << 32);
975 port->dev_geom_head = le16_to_cpu(desc->head);
976 port->dev_geom_sect = le16_to_cpu(desc->sect);
977 port->dev_geom_cyl = le16_to_cpu(desc->cyl);
978
979 host->dev_active |= (1 << cur_port);
980
981 strncpy(port->name, desc->name, sizeof(port->name));
982 port->name[sizeof(port->name) - 1] = 0;
983 slen = strlen(port->name);
984 while (slen && (port->name[slen - 1] == ' ')) {
985 port->name[slen - 1] = 0;
986 slen--;
987 }
988
989 printk(KERN_INFO DRV_NAME "(%s): port %u device %Lu sectors\n",
990 pci_name(host->pdev), port->port_no,
991 (unsigned long long) port->capacity);
992 printk(KERN_INFO DRV_NAME "(%s): port %u device \"%s\"\n",
993 pci_name(host->pdev), port->port_no, port->name);
994
995 out:
996 assert(host->state == HST_DEV_SCAN);
997 schedule_work(&host->fsm_task);
998 }
999
1000 static void carm_handle_scan_chan(struct carm_host *host,
1001 struct carm_request *crq, u8 *mem,
1002 int error)
1003 {
1004 u8 *msg_data = mem + IOC_SCAN_CHAN_OFFSET;
1005 unsigned int i, dev_count = 0;
1006 int new_state = HST_DEV_SCAN_START;
1007
1008 DPRINTK("ENTER\n");
1009
1010 carm_end_rq(host, crq, error);
1011
1012 if (error) {
1013 new_state = HST_ERROR;
1014 goto out;
1015 }
1016
1017 /* TODO: scan and support non-disk devices */
1018 for (i = 0; i < 8; i++)
1019 if (msg_data[i] == 0) { /* direct-access device (disk) */
1020 host->dev_present |= (1 << i);
1021 dev_count++;
1022 }
1023
1024 printk(KERN_INFO DRV_NAME "(%s): found %u interesting devices\n",
1025 pci_name(host->pdev), dev_count);
1026
1027 out:
1028 assert(host->state == HST_PORT_SCAN);
1029 host->state = new_state;
1030 schedule_work(&host->fsm_task);
1031 }
1032
1033 static void carm_handle_generic(struct carm_host *host,
1034 struct carm_request *crq, int error,
1035 int cur_state, int next_state)
1036 {
1037 DPRINTK("ENTER\n");
1038
1039 carm_end_rq(host, crq, error);
1040
1041 assert(host->state == cur_state);
1042 if (error)
1043 host->state = HST_ERROR;
1044 else
1045 host->state = next_state;
1046 schedule_work(&host->fsm_task);
1047 }
1048
1049 static inline void carm_handle_rw(struct carm_host *host,
1050 struct carm_request *crq, int error)
1051 {
1052 int pci_dir;
1053
1054 VPRINTK("ENTER\n");
1055
1056 if (rq_data_dir(crq->rq) == WRITE)
1057 pci_dir = PCI_DMA_TODEVICE;
1058 else
1059 pci_dir = PCI_DMA_FROMDEVICE;
1060
1061 pci_unmap_sg(host->pdev, &crq->sg[0], crq->n_elem, pci_dir);
1062
1063 carm_end_rq(host, crq, error);
1064 }
1065
1066 static inline void carm_handle_resp(struct carm_host *host,
1067 __le32 ret_handle_le, u32 status)
1068 {
1069 u32 handle = le32_to_cpu(ret_handle_le);
1070 unsigned int msg_idx;
1071 struct carm_request *crq;
1072 int error = (status == RMSG_OK) ? 0 : -EIO;
1073 u8 *mem;
1074
1075 VPRINTK("ENTER, handle == 0x%x\n", handle);
1076
1077 if (unlikely(!TAG_VALID(handle))) {
1078 printk(KERN_ERR DRV_NAME "(%s): BUG: invalid tag 0x%x\n",
1079 pci_name(host->pdev), handle);
1080 return;
1081 }
1082
1083 msg_idx = TAG_DECODE(handle);
1084 VPRINTK("tag == %u\n", msg_idx);
1085
1086 crq = &host->req[msg_idx];
1087
1088 /* fast path */
1089 if (likely(crq->msg_type == CARM_MSG_READ ||
1090 crq->msg_type == CARM_MSG_WRITE)) {
1091 carm_handle_rw(host, crq, error);
1092 return;
1093 }
1094
1095 mem = carm_ref_msg(host, msg_idx);
1096
1097 switch (crq->msg_type) {
1098 case CARM_MSG_IOCTL: {
1099 switch (crq->msg_subtype) {
1100 case CARM_IOC_SCAN_CHAN:
1101 carm_handle_scan_chan(host, crq, mem, error);
1102 break;
1103 default:
1104 /* unknown / invalid response */
1105 goto err_out;
1106 }
1107 break;
1108 }
1109
1110 case CARM_MSG_MISC: {
1111 switch (crq->msg_subtype) {
1112 case MISC_ALLOC_MEM:
1113 carm_handle_generic(host, crq, error,
1114 HST_ALLOC_BUF, HST_SYNC_TIME);
1115 break;
1116 case MISC_SET_TIME:
1117 carm_handle_generic(host, crq, error,
1118 HST_SYNC_TIME, HST_GET_FW_VER);
1119 break;
1120 case MISC_GET_FW_VER: {
1121 struct carm_fw_ver *ver = (struct carm_fw_ver *)
1122 mem + sizeof(struct carm_msg_get_fw_ver);
1123 if (!error) {
1124 host->fw_ver = le32_to_cpu(ver->version);
1125 host->flags |= (ver->features & FL_FW_VER_MASK);
1126 }
1127 carm_handle_generic(host, crq, error,
1128 HST_GET_FW_VER, HST_PORT_SCAN);
1129 break;
1130 }
1131 default:
1132 /* unknown / invalid response */
1133 goto err_out;
1134 }
1135 break;
1136 }
1137
1138 case CARM_MSG_ARRAY: {
1139 switch (crq->msg_subtype) {
1140 case CARM_ARRAY_INFO:
1141 carm_handle_array_info(host, crq, mem, error);
1142 break;
1143 default:
1144 /* unknown / invalid response */
1145 goto err_out;
1146 }
1147 break;
1148 }
1149
1150 default:
1151 /* unknown / invalid response */
1152 goto err_out;
1153 }
1154
1155 return;
1156
1157 err_out:
1158 printk(KERN_WARNING DRV_NAME "(%s): BUG: unhandled message type %d/%d\n",
1159 pci_name(host->pdev), crq->msg_type, crq->msg_subtype);
1160 carm_end_rq(host, crq, -EIO);
1161 }
1162
1163 static inline void carm_handle_responses(struct carm_host *host)
1164 {
1165 void __iomem *mmio = host->mmio;
1166 struct carm_response *resp = (struct carm_response *) host->shm;
1167 unsigned int work = 0;
1168 unsigned int idx = host->resp_idx % RMSG_Q_LEN;
1169
1170 while (1) {
1171 u32 status = le32_to_cpu(resp[idx].status);
1172
1173 if (status == 0xffffffff) {
1174 VPRINTK("ending response on index %u\n", idx);
1175 writel(idx << 3, mmio + CARM_RESP_IDX);
1176 break;
1177 }
1178
1179 /* response to a message we sent */
1180 else if ((status & (1 << 31)) == 0) {
1181 VPRINTK("handling msg response on index %u\n", idx);
1182 carm_handle_resp(host, resp[idx].ret_handle, status);
1183 resp[idx].status = cpu_to_le32(0xffffffff);
1184 }
1185
1186 /* asynchronous events the hardware throws our way */
1187 else if ((status & 0xff000000) == (1 << 31)) {
1188 u8 *evt_type_ptr = (u8 *) &resp[idx];
1189 u8 evt_type = *evt_type_ptr;
1190 printk(KERN_WARNING DRV_NAME "(%s): unhandled event type %d\n",
1191 pci_name(host->pdev), (int) evt_type);
1192 resp[idx].status = cpu_to_le32(0xffffffff);
1193 }
1194
1195 idx = NEXT_RESP(idx);
1196 work++;
1197 }
1198
1199 VPRINTK("EXIT, work==%u\n", work);
1200 host->resp_idx += work;
1201 }
1202
1203 static irqreturn_t carm_interrupt(int irq, void *__host)
1204 {
1205 struct carm_host *host = __host;
1206 void __iomem *mmio;
1207 u32 mask;
1208 int handled = 0;
1209 unsigned long flags;
1210
1211 if (!host) {
1212 VPRINTK("no host\n");
1213 return IRQ_NONE;
1214 }
1215
1216 spin_lock_irqsave(&host->lock, flags);
1217
1218 mmio = host->mmio;
1219
1220 /* reading should also clear interrupts */
1221 mask = readl(mmio + CARM_INT_STAT);
1222
1223 if (mask == 0 || mask == 0xffffffff) {
1224 VPRINTK("no work, mask == 0x%x\n", mask);
1225 goto out;
1226 }
1227
1228 if (mask & INT_ACK_MASK)
1229 writel(mask, mmio + CARM_INT_STAT);
1230
1231 if (unlikely(host->state == HST_INVALID)) {
1232 VPRINTK("not initialized yet, mask = 0x%x\n", mask);
1233 goto out;
1234 }
1235
1236 if (mask & CARM_HAVE_RESP) {
1237 handled = 1;
1238 carm_handle_responses(host);
1239 }
1240
1241 out:
1242 spin_unlock_irqrestore(&host->lock, flags);
1243 VPRINTK("EXIT\n");
1244 return IRQ_RETVAL(handled);
1245 }
1246
1247 static void carm_fsm_task (struct work_struct *work)
1248 {
1249 struct carm_host *host =
1250 container_of(work, struct carm_host, fsm_task);
1251 unsigned long flags;
1252 unsigned int state;
1253 int rc, i, next_dev;
1254 int reschedule = 0;
1255 int new_state = HST_INVALID;
1256
1257 spin_lock_irqsave(&host->lock, flags);
1258 state = host->state;
1259 spin_unlock_irqrestore(&host->lock, flags);
1260
1261 DPRINTK("ENTER, state == %s\n", state_name[state]);
1262
1263 switch (state) {
1264 case HST_PROBE_START:
1265 new_state = HST_ALLOC_BUF;
1266 reschedule = 1;
1267 break;
1268
1269 case HST_ALLOC_BUF:
1270 rc = carm_send_special(host, carm_fill_alloc_buf);
1271 if (rc) {
1272 new_state = HST_ERROR;
1273 reschedule = 1;
1274 }
1275 break;
1276
1277 case HST_SYNC_TIME:
1278 rc = carm_send_special(host, carm_fill_sync_time);
1279 if (rc) {
1280 new_state = HST_ERROR;
1281 reschedule = 1;
1282 }
1283 break;
1284
1285 case HST_GET_FW_VER:
1286 rc = carm_send_special(host, carm_fill_get_fw_ver);
1287 if (rc) {
1288 new_state = HST_ERROR;
1289 reschedule = 1;
1290 }
1291 break;
1292
1293 case HST_PORT_SCAN:
1294 rc = carm_send_special(host, carm_fill_scan_channels);
1295 if (rc) {
1296 new_state = HST_ERROR;
1297 reschedule = 1;
1298 }
1299 break;
1300
1301 case HST_DEV_SCAN_START:
1302 host->cur_scan_dev = -1;
1303 new_state = HST_DEV_SCAN;
1304 reschedule = 1;
1305 break;
1306
1307 case HST_DEV_SCAN:
1308 next_dev = -1;
1309 for (i = host->cur_scan_dev + 1; i < CARM_MAX_PORTS; i++)
1310 if (host->dev_present & (1 << i)) {
1311 next_dev = i;
1312 break;
1313 }
1314
1315 if (next_dev >= 0) {
1316 host->cur_scan_dev = next_dev;
1317 rc = carm_array_info(host, next_dev);
1318 if (rc) {
1319 new_state = HST_ERROR;
1320 reschedule = 1;
1321 }
1322 } else {
1323 new_state = HST_DEV_ACTIVATE;
1324 reschedule = 1;
1325 }
1326 break;
1327
1328 case HST_DEV_ACTIVATE: {
1329 int activated = 0;
1330 for (i = 0; i < CARM_MAX_PORTS; i++)
1331 if (host->dev_active & (1 << i)) {
1332 struct carm_port *port = &host->port[i];
1333 struct gendisk *disk = port->disk;
1334
1335 set_capacity(disk, port->capacity);
1336 add_disk(disk);
1337 activated++;
1338 }
1339
1340 printk(KERN_INFO DRV_NAME "(%s): %d ports activated\n",
1341 pci_name(host->pdev), activated);
1342
1343 new_state = HST_PROBE_FINISHED;
1344 reschedule = 1;
1345 break;
1346 }
1347
1348 case HST_PROBE_FINISHED:
1349 complete(&host->probe_comp);
1350 break;
1351
1352 case HST_ERROR:
1353 /* FIXME: TODO */
1354 break;
1355
1356 default:
1357 /* should never occur */
1358 printk(KERN_ERR PFX "BUG: unknown state %d\n", state);
1359 assert(0);
1360 break;
1361 }
1362
1363 if (new_state != HST_INVALID) {
1364 spin_lock_irqsave(&host->lock, flags);
1365 host->state = new_state;
1366 spin_unlock_irqrestore(&host->lock, flags);
1367 }
1368 if (reschedule)
1369 schedule_work(&host->fsm_task);
1370 }
1371
1372 static int carm_init_wait(void __iomem *mmio, u32 bits, unsigned int test_bit)
1373 {
1374 unsigned int i;
1375
1376 for (i = 0; i < 50000; i++) {
1377 u32 tmp = readl(mmio + CARM_LMUC);
1378 udelay(100);
1379
1380 if (test_bit) {
1381 if ((tmp & bits) == bits)
1382 return 0;
1383 } else {
1384 if ((tmp & bits) == 0)
1385 return 0;
1386 }
1387
1388 cond_resched();
1389 }
1390
1391 printk(KERN_ERR PFX "carm_init_wait timeout, bits == 0x%x, test_bit == %s\n",
1392 bits, test_bit ? "yes" : "no");
1393 return -EBUSY;
1394 }
1395
1396 static void carm_init_responses(struct carm_host *host)
1397 {
1398 void __iomem *mmio = host->mmio;
1399 unsigned int i;
1400 struct carm_response *resp = (struct carm_response *) host->shm;
1401
1402 for (i = 0; i < RMSG_Q_LEN; i++)
1403 resp[i].status = cpu_to_le32(0xffffffff);
1404
1405 writel(0, mmio + CARM_RESP_IDX);
1406 }
1407
1408 static int carm_init_host(struct carm_host *host)
1409 {
1410 void __iomem *mmio = host->mmio;
1411 u32 tmp;
1412 u8 tmp8;
1413 int rc;
1414
1415 DPRINTK("ENTER\n");
1416
1417 writel(0, mmio + CARM_INT_MASK);
1418
1419 tmp8 = readb(mmio + CARM_INITC);
1420 if (tmp8 & 0x01) {
1421 tmp8 &= ~0x01;
1422 writeb(tmp8, mmio + CARM_INITC);
1423 readb(mmio + CARM_INITC); /* flush */
1424
1425 DPRINTK("snooze...\n");
1426 msleep(5000);
1427 }
1428
1429 tmp = readl(mmio + CARM_HMUC);
1430 if (tmp & CARM_CME) {
1431 DPRINTK("CME bit present, waiting\n");
1432 rc = carm_init_wait(mmio, CARM_CME, 1);
1433 if (rc) {
1434 DPRINTK("EXIT, carm_init_wait 1 failed\n");
1435 return rc;
1436 }
1437 }
1438 if (tmp & CARM_RME) {
1439 DPRINTK("RME bit present, waiting\n");
1440 rc = carm_init_wait(mmio, CARM_RME, 1);
1441 if (rc) {
1442 DPRINTK("EXIT, carm_init_wait 2 failed\n");
1443 return rc;
1444 }
1445 }
1446
1447 tmp &= ~(CARM_RME | CARM_CME);
1448 writel(tmp, mmio + CARM_HMUC);
1449 readl(mmio + CARM_HMUC); /* flush */
1450
1451 rc = carm_init_wait(mmio, CARM_RME | CARM_CME, 0);
1452 if (rc) {
1453 DPRINTK("EXIT, carm_init_wait 3 failed\n");
1454 return rc;
1455 }
1456
1457 carm_init_buckets(mmio);
1458
1459 writel(host->shm_dma & 0xffffffff, mmio + RBUF_ADDR_LO);
1460 writel((host->shm_dma >> 16) >> 16, mmio + RBUF_ADDR_HI);
1461 writel(RBUF_LEN, mmio + RBUF_BYTE_SZ);
1462
1463 tmp = readl(mmio + CARM_HMUC);
1464 tmp |= (CARM_RME | CARM_CME | CARM_WZBC);
1465 writel(tmp, mmio + CARM_HMUC);
1466 readl(mmio + CARM_HMUC); /* flush */
1467
1468 rc = carm_init_wait(mmio, CARM_RME | CARM_CME, 1);
1469 if (rc) {
1470 DPRINTK("EXIT, carm_init_wait 4 failed\n");
1471 return rc;
1472 }
1473
1474 writel(0, mmio + CARM_HMPHA);
1475 writel(INT_DEF_MASK, mmio + CARM_INT_MASK);
1476
1477 carm_init_responses(host);
1478
1479 /* start initialization, probing state machine */
1480 spin_lock_irq(&host->lock);
1481 assert(host->state == HST_INVALID);
1482 host->state = HST_PROBE_START;
1483 spin_unlock_irq(&host->lock);
1484 schedule_work(&host->fsm_task);
1485
1486 DPRINTK("EXIT\n");
1487 return 0;
1488 }
1489
1490 static int carm_init_disks(struct carm_host *host)
1491 {
1492 unsigned int i;
1493 int rc = 0;
1494
1495 for (i = 0; i < CARM_MAX_PORTS; i++) {
1496 struct gendisk *disk;
1497 struct request_queue *q;
1498 struct carm_port *port;
1499
1500 port = &host->port[i];
1501 port->host = host;
1502 port->port_no = i;
1503
1504 disk = alloc_disk(CARM_MINORS_PER_MAJOR);
1505 if (!disk) {
1506 rc = -ENOMEM;
1507 break;
1508 }
1509
1510 port->disk = disk;
1511 sprintf(disk->disk_name, DRV_NAME "/%u",
1512 (unsigned int) (host->id * CARM_MAX_PORTS) + i);
1513 disk->major = host->major;
1514 disk->first_minor = i * CARM_MINORS_PER_MAJOR;
1515 disk->fops = &carm_bd_ops;
1516 disk->private_data = port;
1517
1518 q = blk_init_queue(carm_rq_fn, &host->lock);
1519 if (!q) {
1520 rc = -ENOMEM;
1521 break;
1522 }
1523 disk->queue = q;
1524 blk_queue_max_hw_segments(q, CARM_MAX_REQ_SG);
1525 blk_queue_max_phys_segments(q, CARM_MAX_REQ_SG);
1526 blk_queue_segment_boundary(q, CARM_SG_BOUNDARY);
1527
1528 q->queuedata = port;
1529 }
1530
1531 return rc;
1532 }
1533
1534 static void carm_free_disks(struct carm_host *host)
1535 {
1536 unsigned int i;
1537
1538 for (i = 0; i < CARM_MAX_PORTS; i++) {
1539 struct gendisk *disk = host->port[i].disk;
1540 if (disk) {
1541 struct request_queue *q = disk->queue;
1542
1543 if (disk->flags & GENHD_FL_UP)
1544 del_gendisk(disk);
1545 if (q)
1546 blk_cleanup_queue(q);
1547 put_disk(disk);
1548 }
1549 }
1550 }
1551
1552 static int carm_init_shm(struct carm_host *host)
1553 {
1554 host->shm = pci_alloc_consistent(host->pdev, CARM_SHM_SIZE,
1555 &host->shm_dma);
1556 if (!host->shm)
1557 return -ENOMEM;
1558
1559 host->msg_base = host->shm + RBUF_LEN;
1560 host->msg_dma = host->shm_dma + RBUF_LEN;
1561
1562 memset(host->shm, 0xff, RBUF_LEN);
1563 memset(host->msg_base, 0, PDC_SHM_SIZE - RBUF_LEN);
1564
1565 return 0;
1566 }
1567
1568 static int carm_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
1569 {
1570 static unsigned int printed_version;
1571 struct carm_host *host;
1572 unsigned int pci_dac;
1573 int rc;
1574 struct request_queue *q;
1575 unsigned int i;
1576
1577 if (!printed_version++)
1578 printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
1579
1580 rc = pci_enable_device(pdev);
1581 if (rc)
1582 return rc;
1583
1584 rc = pci_request_regions(pdev, DRV_NAME);
1585 if (rc)
1586 goto err_out;
1587
1588 #ifdef IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
1589 rc = pci_set_dma_mask(pdev, DMA_64BIT_MASK);
1590 if (!rc) {
1591 rc = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
1592 if (rc) {
1593 printk(KERN_ERR DRV_NAME "(%s): consistent DMA mask failure\n",
1594 pci_name(pdev));
1595 goto err_out_regions;
1596 }
1597 pci_dac = 1;
1598 } else {
1599 #endif
1600 rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
1601 if (rc) {
1602 printk(KERN_ERR DRV_NAME "(%s): DMA mask failure\n",
1603 pci_name(pdev));
1604 goto err_out_regions;
1605 }
1606 pci_dac = 0;
1607 #ifdef IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
1608 }
1609 #endif
1610
1611 host = kzalloc(sizeof(*host), GFP_KERNEL);
1612 if (!host) {
1613 printk(KERN_ERR DRV_NAME "(%s): memory alloc failure\n",
1614 pci_name(pdev));
1615 rc = -ENOMEM;
1616 goto err_out_regions;
1617 }
1618
1619 host->pdev = pdev;
1620 host->flags = pci_dac ? FL_DAC : 0;
1621 spin_lock_init(&host->lock);
1622 INIT_WORK(&host->fsm_task, carm_fsm_task);
1623 init_completion(&host->probe_comp);
1624
1625 for (i = 0; i < ARRAY_SIZE(host->req); i++)
1626 host->req[i].tag = i;
1627
1628 host->mmio = ioremap(pci_resource_start(pdev, 0),
1629 pci_resource_len(pdev, 0));
1630 if (!host->mmio) {
1631 printk(KERN_ERR DRV_NAME "(%s): MMIO alloc failure\n",
1632 pci_name(pdev));
1633 rc = -ENOMEM;
1634 goto err_out_kfree;
1635 }
1636
1637 rc = carm_init_shm(host);
1638 if (rc) {
1639 printk(KERN_ERR DRV_NAME "(%s): DMA SHM alloc failure\n",
1640 pci_name(pdev));
1641 goto err_out_iounmap;
1642 }
1643
1644 q = blk_init_queue(carm_oob_rq_fn, &host->lock);
1645 if (!q) {
1646 printk(KERN_ERR DRV_NAME "(%s): OOB queue alloc failure\n",
1647 pci_name(pdev));
1648 rc = -ENOMEM;
1649 goto err_out_pci_free;
1650 }
1651 host->oob_q = q;
1652 q->queuedata = host;
1653
1654 /*
1655 * Figure out which major to use: 160, 161, or dynamic
1656 */
1657 if (!test_and_set_bit(0, &carm_major_alloc))
1658 host->major = 160;
1659 else if (!test_and_set_bit(1, &carm_major_alloc))
1660 host->major = 161;
1661 else
1662 host->flags |= FL_DYN_MAJOR;
1663
1664 host->id = carm_host_id;
1665 sprintf(host->name, DRV_NAME "%d", carm_host_id);
1666
1667 rc = register_blkdev(host->major, host->name);
1668 if (rc < 0)
1669 goto err_out_free_majors;
1670 if (host->flags & FL_DYN_MAJOR)
1671 host->major = rc;
1672
1673 rc = carm_init_disks(host);
1674 if (rc)
1675 goto err_out_blkdev_disks;
1676
1677 pci_set_master(pdev);
1678
1679 rc = request_irq(pdev->irq, carm_interrupt, IRQF_SHARED, DRV_NAME, host);
1680 if (rc) {
1681 printk(KERN_ERR DRV_NAME "(%s): irq alloc failure\n",
1682 pci_name(pdev));
1683 goto err_out_blkdev_disks;
1684 }
1685
1686 rc = carm_init_host(host);
1687 if (rc)
1688 goto err_out_free_irq;
1689
1690 DPRINTK("waiting for probe_comp\n");
1691 wait_for_completion(&host->probe_comp);
1692
1693 printk(KERN_INFO "%s: pci %s, ports %d, io %llx, irq %u, major %d\n",
1694 host->name, pci_name(pdev), (int) CARM_MAX_PORTS,
1695 (unsigned long long)pci_resource_start(pdev, 0),
1696 pdev->irq, host->major);
1697
1698 carm_host_id++;
1699 pci_set_drvdata(pdev, host);
1700 return 0;
1701
1702 err_out_free_irq:
1703 free_irq(pdev->irq, host);
1704 err_out_blkdev_disks:
1705 carm_free_disks(host);
1706 unregister_blkdev(host->major, host->name);
1707 err_out_free_majors:
1708 if (host->major == 160)
1709 clear_bit(0, &carm_major_alloc);
1710 else if (host->major == 161)
1711 clear_bit(1, &carm_major_alloc);
1712 blk_cleanup_queue(host->oob_q);
1713 err_out_pci_free:
1714 pci_free_consistent(pdev, CARM_SHM_SIZE, host->shm, host->shm_dma);
1715 err_out_iounmap:
1716 iounmap(host->mmio);
1717 err_out_kfree:
1718 kfree(host);
1719 err_out_regions:
1720 pci_release_regions(pdev);
1721 err_out:
1722 pci_disable_device(pdev);
1723 return rc;
1724 }
1725
1726 static void carm_remove_one (struct pci_dev *pdev)
1727 {
1728 struct carm_host *host = pci_get_drvdata(pdev);
1729
1730 if (!host) {
1731 printk(KERN_ERR PFX "BUG: no host data for PCI(%s)\n",
1732 pci_name(pdev));
1733 return;
1734 }
1735
1736 free_irq(pdev->irq, host);
1737 carm_free_disks(host);
1738 unregister_blkdev(host->major, host->name);
1739 if (host->major == 160)
1740 clear_bit(0, &carm_major_alloc);
1741 else if (host->major == 161)
1742 clear_bit(1, &carm_major_alloc);
1743 blk_cleanup_queue(host->oob_q);
1744 pci_free_consistent(pdev, CARM_SHM_SIZE, host->shm, host->shm_dma);
1745 iounmap(host->mmio);
1746 kfree(host);
1747 pci_release_regions(pdev);
1748 pci_disable_device(pdev);
1749 pci_set_drvdata(pdev, NULL);
1750 }
1751
1752 static int __init carm_init(void)
1753 {
1754 return pci_register_driver(&carm_driver);
1755 }
1756
1757 static void __exit carm_exit(void)
1758 {
1759 pci_unregister_driver(&carm_driver);
1760 }
1761
1762 module_init(carm_init);
1763 module_exit(carm_exit);
1764
1765
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