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/blk-mq.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/ktime.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 <linux/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, __func__, ## args)
83 #ifdef CARM_VERBOSE_DEBUG
84 #define VPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ## 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__, __func__, __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_DYN_MAJOR = (1 << 17),
201 };
202
203 enum {
204 CARM_SG_BOUNDARY = 0xffffUL, /* s/g segment boundary */
205 };
206
207 enum scatter_gather_types {
208 SGT_32BIT = 0,
209 SGT_64BIT = 1,
210 };
211
212 enum host_states {
213 HST_INVALID, /* invalid state; never used */
214 HST_ALLOC_BUF, /* setting up master SHM area */
215 HST_ERROR, /* we never leave here */
216 HST_PORT_SCAN, /* start dev scan */
217 HST_DEV_SCAN_START, /* start per-device probe */
218 HST_DEV_SCAN, /* continue per-device probe */
219 HST_DEV_ACTIVATE, /* activate devices we found */
220 HST_PROBE_FINISHED, /* probe is complete */
221 HST_PROBE_START, /* initiate probe */
222 HST_SYNC_TIME, /* tell firmware what time it is */
223 HST_GET_FW_VER, /* get firmware version, adapter port cnt */
224 };
225
226 #ifdef CARM_DEBUG
227 static const char *state_name[] = {
228 "HST_INVALID",
229 "HST_ALLOC_BUF",
230 "HST_ERROR",
231 "HST_PORT_SCAN",
232 "HST_DEV_SCAN_START",
233 "HST_DEV_SCAN",
234 "HST_DEV_ACTIVATE",
235 "HST_PROBE_FINISHED",
236 "HST_PROBE_START",
237 "HST_SYNC_TIME",
238 "HST_GET_FW_VER",
239 };
240 #endif
241
242 struct carm_port {
243 unsigned int port_no;
244 struct gendisk *disk;
245 struct carm_host *host;
246
247 /* attached device characteristics */
248 u64 capacity;
249 char name[41];
250 u16 dev_geom_head;
251 u16 dev_geom_sect;
252 u16 dev_geom_cyl;
253 };
254
255 struct carm_request {
256 int n_elem;
257 unsigned int msg_type;
258 unsigned int msg_subtype;
259 unsigned int msg_bucket;
260 struct scatterlist sg[CARM_MAX_REQ_SG];
261 };
262
263 struct carm_host {
264 unsigned long flags;
265 void __iomem *mmio;
266 void *shm;
267 dma_addr_t shm_dma;
268
269 int major;
270 int id;
271 char name[32];
272
273 spinlock_t lock;
274 struct pci_dev *pdev;
275 unsigned int state;
276 u32 fw_ver;
277
278 struct blk_mq_tag_set tag_set;
279 struct request_queue *oob_q;
280 unsigned int n_oob;
281
282 unsigned int hw_sg_used;
283
284 unsigned int resp_idx;
285
286 unsigned int wait_q_prod;
287 unsigned int wait_q_cons;
288 struct request_queue *wait_q[CARM_MAX_WAIT_Q];
289
290 void *msg_base;
291 dma_addr_t msg_dma;
292
293 int cur_scan_dev;
294 unsigned long dev_active;
295 unsigned long dev_present;
296 struct carm_port port[CARM_MAX_PORTS];
297
298 struct work_struct fsm_task;
299
300 struct completion probe_comp;
301 };
302
303 struct carm_response {
304 __le32 ret_handle;
305 __le32 status;
306 } __attribute__((packed));
307
308 struct carm_msg_sg {
309 __le32 start;
310 __le32 len;
311 } __attribute__((packed));
312
313 struct carm_msg_rw {
314 u8 type;
315 u8 id;
316 u8 sg_count;
317 u8 sg_type;
318 __le32 handle;
319 __le32 lba;
320 __le16 lba_count;
321 __le16 lba_high;
322 struct carm_msg_sg sg[32];
323 } __attribute__((packed));
324
325 struct carm_msg_allocbuf {
326 u8 type;
327 u8 subtype;
328 u8 n_sg;
329 u8 sg_type;
330 __le32 handle;
331 __le32 addr;
332 __le32 len;
333 __le32 evt_pool;
334 __le32 n_evt;
335 __le32 rbuf_pool;
336 __le32 n_rbuf;
337 __le32 msg_pool;
338 __le32 n_msg;
339 struct carm_msg_sg sg[8];
340 } __attribute__((packed));
341
342 struct carm_msg_ioctl {
343 u8 type;
344 u8 subtype;
345 u8 array_id;
346 u8 reserved1;
347 __le32 handle;
348 __le32 data_addr;
349 u32 reserved2;
350 } __attribute__((packed));
351
352 struct carm_msg_sync_time {
353 u8 type;
354 u8 subtype;
355 u16 reserved1;
356 __le32 handle;
357 u32 reserved2;
358 __le32 timestamp;
359 } __attribute__((packed));
360
361 struct carm_msg_get_fw_ver {
362 u8 type;
363 u8 subtype;
364 u16 reserved1;
365 __le32 handle;
366 __le32 data_addr;
367 u32 reserved2;
368 } __attribute__((packed));
369
370 struct carm_fw_ver {
371 __le32 version;
372 u8 features;
373 u8 reserved1;
374 u16 reserved2;
375 } __attribute__((packed));
376
377 struct carm_array_info {
378 __le32 size;
379
380 __le16 size_hi;
381 __le16 stripe_size;
382
383 __le32 mode;
384
385 __le16 stripe_blk_sz;
386 __le16 reserved1;
387
388 __le16 cyl;
389 __le16 head;
390
391 __le16 sect;
392 u8 array_id;
393 u8 reserved2;
394
395 char name[40];
396
397 __le32 array_status;
398
399 /* device list continues beyond this point? */
400 } __attribute__((packed));
401
402 static int carm_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
403 static void carm_remove_one (struct pci_dev *pdev);
404 static int carm_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo);
405
406 static const struct pci_device_id carm_pci_tbl[] = {
407 { PCI_VENDOR_ID_PROMISE, 0x8000, PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
408 { PCI_VENDOR_ID_PROMISE, 0x8002, PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
409 { } /* terminate list */
410 };
411 MODULE_DEVICE_TABLE(pci, carm_pci_tbl);
412
413 static struct pci_driver carm_driver = {
414 .name = DRV_NAME,
415 .id_table = carm_pci_tbl,
416 .probe = carm_init_one,
417 .remove = carm_remove_one,
418 };
419
420 static const struct block_device_operations carm_bd_ops = {
421 .owner = THIS_MODULE,
422 .getgeo = carm_bdev_getgeo,
423 };
424
425 static unsigned int carm_host_id;
426 static unsigned long carm_major_alloc;
427
428
429
carm_bdev_getgeo(struct block_device * bdev,struct hd_geometry * geo)430 static int carm_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo)
431 {
432 struct carm_port *port = bdev->bd_disk->private_data;
433
434 geo->heads = (u8) port->dev_geom_head;
435 geo->sectors = (u8) port->dev_geom_sect;
436 geo->cylinders = port->dev_geom_cyl;
437 return 0;
438 }
439
440 static const u32 msg_sizes[] = { 32, 64, 128, CARM_MSG_SIZE };
441
carm_lookup_bucket(u32 msg_size)442 static inline int carm_lookup_bucket(u32 msg_size)
443 {
444 int i;
445
446 for (i = 0; i < ARRAY_SIZE(msg_sizes); i++)
447 if (msg_size <= msg_sizes[i])
448 return i;
449
450 return -ENOENT;
451 }
452
carm_init_buckets(void __iomem * mmio)453 static void carm_init_buckets(void __iomem *mmio)
454 {
455 unsigned int i;
456
457 for (i = 0; i < ARRAY_SIZE(msg_sizes); i++)
458 writel(msg_sizes[i], mmio + CARM_CMS0 + (4 * i));
459 }
460
carm_ref_msg(struct carm_host * host,unsigned int msg_idx)461 static inline void *carm_ref_msg(struct carm_host *host,
462 unsigned int msg_idx)
463 {
464 return host->msg_base + (msg_idx * CARM_MSG_SIZE);
465 }
466
carm_ref_msg_dma(struct carm_host * host,unsigned int msg_idx)467 static inline dma_addr_t carm_ref_msg_dma(struct carm_host *host,
468 unsigned int msg_idx)
469 {
470 return host->msg_dma + (msg_idx * CARM_MSG_SIZE);
471 }
472
carm_send_msg(struct carm_host * host,struct carm_request * crq,unsigned tag)473 static int carm_send_msg(struct carm_host *host,
474 struct carm_request *crq, unsigned tag)
475 {
476 void __iomem *mmio = host->mmio;
477 u32 msg = (u32) carm_ref_msg_dma(host, tag);
478 u32 cm_bucket = crq->msg_bucket;
479 u32 tmp;
480 int rc = 0;
481
482 VPRINTK("ENTER\n");
483
484 tmp = readl(mmio + CARM_HMUC);
485 if (tmp & CARM_Q_FULL) {
486 #if 0
487 tmp = readl(mmio + CARM_INT_MASK);
488 tmp |= INT_Q_AVAILABLE;
489 writel(tmp, mmio + CARM_INT_MASK);
490 readl(mmio + CARM_INT_MASK); /* flush */
491 #endif
492 DPRINTK("host msg queue full\n");
493 rc = -EBUSY;
494 } else {
495 writel(msg | (cm_bucket << 1), mmio + CARM_IHQP);
496 readl(mmio + CARM_IHQP); /* flush */
497 }
498
499 return rc;
500 }
501
carm_array_info(struct carm_host * host,unsigned int array_idx)502 static int carm_array_info (struct carm_host *host, unsigned int array_idx)
503 {
504 struct carm_msg_ioctl *ioc;
505 u32 msg_data;
506 dma_addr_t msg_dma;
507 struct carm_request *crq;
508 struct request *rq;
509 int rc;
510
511 rq = blk_mq_alloc_request(host->oob_q, REQ_OP_DRV_OUT, 0);
512 if (IS_ERR(rq)) {
513 rc = -ENOMEM;
514 goto err_out;
515 }
516 crq = blk_mq_rq_to_pdu(rq);
517
518 ioc = carm_ref_msg(host, rq->tag);
519 msg_dma = carm_ref_msg_dma(host, rq->tag);
520 msg_data = (u32) (msg_dma + sizeof(struct carm_array_info));
521
522 crq->msg_type = CARM_MSG_ARRAY;
523 crq->msg_subtype = CARM_ARRAY_INFO;
524 rc = carm_lookup_bucket(sizeof(struct carm_msg_ioctl) +
525 sizeof(struct carm_array_info));
526 BUG_ON(rc < 0);
527 crq->msg_bucket = (u32) rc;
528
529 memset(ioc, 0, sizeof(*ioc));
530 ioc->type = CARM_MSG_ARRAY;
531 ioc->subtype = CARM_ARRAY_INFO;
532 ioc->array_id = (u8) array_idx;
533 ioc->handle = cpu_to_le32(TAG_ENCODE(rq->tag));
534 ioc->data_addr = cpu_to_le32(msg_data);
535
536 spin_lock_irq(&host->lock);
537 assert(host->state == HST_DEV_SCAN_START ||
538 host->state == HST_DEV_SCAN);
539 spin_unlock_irq(&host->lock);
540
541 DPRINTK("blk_execute_rq_nowait, tag == %u\n", rq->tag);
542 blk_execute_rq_nowait(NULL, rq, true, NULL);
543
544 return 0;
545
546 err_out:
547 spin_lock_irq(&host->lock);
548 host->state = HST_ERROR;
549 spin_unlock_irq(&host->lock);
550 return rc;
551 }
552
553 typedef unsigned int (*carm_sspc_t)(struct carm_host *, unsigned int, void *);
554
carm_send_special(struct carm_host * host,carm_sspc_t func)555 static int carm_send_special (struct carm_host *host, carm_sspc_t func)
556 {
557 struct request *rq;
558 struct carm_request *crq;
559 struct carm_msg_ioctl *ioc;
560 void *mem;
561 unsigned int msg_size;
562 int rc;
563
564 rq = blk_mq_alloc_request(host->oob_q, REQ_OP_DRV_OUT, 0);
565 if (IS_ERR(rq))
566 return -ENOMEM;
567 crq = blk_mq_rq_to_pdu(rq);
568
569 mem = carm_ref_msg(host, rq->tag);
570
571 msg_size = func(host, rq->tag, mem);
572
573 ioc = mem;
574 crq->msg_type = ioc->type;
575 crq->msg_subtype = ioc->subtype;
576 rc = carm_lookup_bucket(msg_size);
577 BUG_ON(rc < 0);
578 crq->msg_bucket = (u32) rc;
579
580 DPRINTK("blk_execute_rq_nowait, tag == %u\n", rq->tag);
581 blk_execute_rq_nowait(NULL, rq, true, NULL);
582
583 return 0;
584 }
585
carm_fill_sync_time(struct carm_host * host,unsigned int idx,void * mem)586 static unsigned int carm_fill_sync_time(struct carm_host *host,
587 unsigned int idx, void *mem)
588 {
589 struct carm_msg_sync_time *st = mem;
590
591 time64_t tv = ktime_get_real_seconds();
592
593 memset(st, 0, sizeof(*st));
594 st->type = CARM_MSG_MISC;
595 st->subtype = MISC_SET_TIME;
596 st->handle = cpu_to_le32(TAG_ENCODE(idx));
597 st->timestamp = cpu_to_le32(tv);
598
599 return sizeof(struct carm_msg_sync_time);
600 }
601
carm_fill_alloc_buf(struct carm_host * host,unsigned int idx,void * mem)602 static unsigned int carm_fill_alloc_buf(struct carm_host *host,
603 unsigned int idx, void *mem)
604 {
605 struct carm_msg_allocbuf *ab = mem;
606
607 memset(ab, 0, sizeof(*ab));
608 ab->type = CARM_MSG_MISC;
609 ab->subtype = MISC_ALLOC_MEM;
610 ab->handle = cpu_to_le32(TAG_ENCODE(idx));
611 ab->n_sg = 1;
612 ab->sg_type = SGT_32BIT;
613 ab->addr = cpu_to_le32(host->shm_dma + (PDC_SHM_SIZE >> 1));
614 ab->len = cpu_to_le32(PDC_SHM_SIZE >> 1);
615 ab->evt_pool = cpu_to_le32(host->shm_dma + (16 * 1024));
616 ab->n_evt = cpu_to_le32(1024);
617 ab->rbuf_pool = cpu_to_le32(host->shm_dma);
618 ab->n_rbuf = cpu_to_le32(RMSG_Q_LEN);
619 ab->msg_pool = cpu_to_le32(host->shm_dma + RBUF_LEN);
620 ab->n_msg = cpu_to_le32(CARM_Q_LEN);
621 ab->sg[0].start = cpu_to_le32(host->shm_dma + (PDC_SHM_SIZE >> 1));
622 ab->sg[0].len = cpu_to_le32(65536);
623
624 return sizeof(struct carm_msg_allocbuf);
625 }
626
carm_fill_scan_channels(struct carm_host * host,unsigned int idx,void * mem)627 static unsigned int carm_fill_scan_channels(struct carm_host *host,
628 unsigned int idx, void *mem)
629 {
630 struct carm_msg_ioctl *ioc = mem;
631 u32 msg_data = (u32) (carm_ref_msg_dma(host, idx) +
632 IOC_SCAN_CHAN_OFFSET);
633
634 memset(ioc, 0, sizeof(*ioc));
635 ioc->type = CARM_MSG_IOCTL;
636 ioc->subtype = CARM_IOC_SCAN_CHAN;
637 ioc->handle = cpu_to_le32(TAG_ENCODE(idx));
638 ioc->data_addr = cpu_to_le32(msg_data);
639
640 /* fill output data area with "no device" default values */
641 mem += IOC_SCAN_CHAN_OFFSET;
642 memset(mem, IOC_SCAN_CHAN_NODEV, CARM_MAX_PORTS);
643
644 return IOC_SCAN_CHAN_OFFSET + CARM_MAX_PORTS;
645 }
646
carm_fill_get_fw_ver(struct carm_host * host,unsigned int idx,void * mem)647 static unsigned int carm_fill_get_fw_ver(struct carm_host *host,
648 unsigned int idx, void *mem)
649 {
650 struct carm_msg_get_fw_ver *ioc = mem;
651 u32 msg_data = (u32) (carm_ref_msg_dma(host, idx) + sizeof(*ioc));
652
653 memset(ioc, 0, sizeof(*ioc));
654 ioc->type = CARM_MSG_MISC;
655 ioc->subtype = MISC_GET_FW_VER;
656 ioc->handle = cpu_to_le32(TAG_ENCODE(idx));
657 ioc->data_addr = cpu_to_le32(msg_data);
658
659 return sizeof(struct carm_msg_get_fw_ver) +
660 sizeof(struct carm_fw_ver);
661 }
662
carm_push_q(struct carm_host * host,struct request_queue * q)663 static inline void carm_push_q (struct carm_host *host, struct request_queue *q)
664 {
665 unsigned int idx = host->wait_q_prod % CARM_MAX_WAIT_Q;
666
667 blk_mq_stop_hw_queues(q);
668 VPRINTK("STOPPED QUEUE %p\n", q);
669
670 host->wait_q[idx] = q;
671 host->wait_q_prod++;
672 BUG_ON(host->wait_q_prod == host->wait_q_cons); /* overrun */
673 }
674
carm_pop_q(struct carm_host * host)675 static inline struct request_queue *carm_pop_q(struct carm_host *host)
676 {
677 unsigned int idx;
678
679 if (host->wait_q_prod == host->wait_q_cons)
680 return NULL;
681
682 idx = host->wait_q_cons % CARM_MAX_WAIT_Q;
683 host->wait_q_cons++;
684
685 return host->wait_q[idx];
686 }
687
carm_round_robin(struct carm_host * host)688 static inline void carm_round_robin(struct carm_host *host)
689 {
690 struct request_queue *q = carm_pop_q(host);
691 if (q) {
692 blk_mq_start_hw_queues(q);
693 VPRINTK("STARTED QUEUE %p\n", q);
694 }
695 }
696
carm_rq_dir(struct request * rq)697 static inline enum dma_data_direction carm_rq_dir(struct request *rq)
698 {
699 return op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
700 }
701
carm_queue_rq(struct blk_mq_hw_ctx * hctx,const struct blk_mq_queue_data * bd)702 static blk_status_t carm_queue_rq(struct blk_mq_hw_ctx *hctx,
703 const struct blk_mq_queue_data *bd)
704 {
705 struct request_queue *q = hctx->queue;
706 struct request *rq = bd->rq;
707 struct carm_port *port = q->queuedata;
708 struct carm_host *host = port->host;
709 struct carm_request *crq = blk_mq_rq_to_pdu(rq);
710 struct carm_msg_rw *msg;
711 struct scatterlist *sg;
712 int i, n_elem = 0, rc;
713 unsigned int msg_size;
714 u32 tmp;
715
716 crq->n_elem = 0;
717 sg_init_table(crq->sg, CARM_MAX_REQ_SG);
718
719 blk_mq_start_request(rq);
720
721 spin_lock_irq(&host->lock);
722 if (req_op(rq) == REQ_OP_DRV_OUT)
723 goto send_msg;
724
725 /* get scatterlist from block layer */
726 sg = &crq->sg[0];
727 n_elem = blk_rq_map_sg(q, rq, sg);
728 if (n_elem <= 0)
729 goto out_ioerr;
730
731 /* map scatterlist to PCI bus addresses */
732 n_elem = dma_map_sg(&host->pdev->dev, sg, n_elem, carm_rq_dir(rq));
733 if (n_elem <= 0)
734 goto out_ioerr;
735
736 /* obey global hardware limit on S/G entries */
737 if (host->hw_sg_used >= CARM_MAX_HOST_SG - n_elem)
738 goto out_resource;
739
740 crq->n_elem = n_elem;
741 host->hw_sg_used += n_elem;
742
743 /*
744 * build read/write message
745 */
746
747 VPRINTK("build msg\n");
748 msg = (struct carm_msg_rw *) carm_ref_msg(host, rq->tag);
749
750 if (rq_data_dir(rq) == WRITE) {
751 msg->type = CARM_MSG_WRITE;
752 crq->msg_type = CARM_MSG_WRITE;
753 } else {
754 msg->type = CARM_MSG_READ;
755 crq->msg_type = CARM_MSG_READ;
756 }
757
758 msg->id = port->port_no;
759 msg->sg_count = n_elem;
760 msg->sg_type = SGT_32BIT;
761 msg->handle = cpu_to_le32(TAG_ENCODE(rq->tag));
762 msg->lba = cpu_to_le32(blk_rq_pos(rq) & 0xffffffff);
763 tmp = (blk_rq_pos(rq) >> 16) >> 16;
764 msg->lba_high = cpu_to_le16( (u16) tmp );
765 msg->lba_count = cpu_to_le16(blk_rq_sectors(rq));
766
767 msg_size = sizeof(struct carm_msg_rw) - sizeof(msg->sg);
768 for (i = 0; i < n_elem; i++) {
769 struct carm_msg_sg *carm_sg = &msg->sg[i];
770 carm_sg->start = cpu_to_le32(sg_dma_address(&crq->sg[i]));
771 carm_sg->len = cpu_to_le32(sg_dma_len(&crq->sg[i]));
772 msg_size += sizeof(struct carm_msg_sg);
773 }
774
775 rc = carm_lookup_bucket(msg_size);
776 BUG_ON(rc < 0);
777 crq->msg_bucket = (u32) rc;
778 send_msg:
779 /*
780 * queue read/write message to hardware
781 */
782 VPRINTK("send msg, tag == %u\n", rq->tag);
783 rc = carm_send_msg(host, crq, rq->tag);
784 if (rc) {
785 host->hw_sg_used -= n_elem;
786 goto out_resource;
787 }
788
789 spin_unlock_irq(&host->lock);
790 return BLK_STS_OK;
791 out_resource:
792 dma_unmap_sg(&host->pdev->dev, &crq->sg[0], n_elem, carm_rq_dir(rq));
793 carm_push_q(host, q);
794 spin_unlock_irq(&host->lock);
795 return BLK_STS_DEV_RESOURCE;
796 out_ioerr:
797 carm_round_robin(host);
798 spin_unlock_irq(&host->lock);
799 return BLK_STS_IOERR;
800 }
801
carm_handle_array_info(struct carm_host * host,struct carm_request * crq,u8 * mem,blk_status_t error)802 static void carm_handle_array_info(struct carm_host *host,
803 struct carm_request *crq, u8 *mem,
804 blk_status_t error)
805 {
806 struct carm_port *port;
807 u8 *msg_data = mem + sizeof(struct carm_array_info);
808 struct carm_array_info *desc = (struct carm_array_info *) msg_data;
809 u64 lo, hi;
810 int cur_port;
811 size_t slen;
812
813 DPRINTK("ENTER\n");
814
815 if (error)
816 goto out;
817 if (le32_to_cpu(desc->array_status) & ARRAY_NO_EXIST)
818 goto out;
819
820 cur_port = host->cur_scan_dev;
821
822 /* should never occur */
823 if ((cur_port < 0) || (cur_port >= CARM_MAX_PORTS)) {
824 printk(KERN_ERR PFX "BUG: cur_scan_dev==%d, array_id==%d\n",
825 cur_port, (int) desc->array_id);
826 goto out;
827 }
828
829 port = &host->port[cur_port];
830
831 lo = (u64) le32_to_cpu(desc->size);
832 hi = (u64) le16_to_cpu(desc->size_hi);
833
834 port->capacity = lo | (hi << 32);
835 port->dev_geom_head = le16_to_cpu(desc->head);
836 port->dev_geom_sect = le16_to_cpu(desc->sect);
837 port->dev_geom_cyl = le16_to_cpu(desc->cyl);
838
839 host->dev_active |= (1 << cur_port);
840
841 strncpy(port->name, desc->name, sizeof(port->name));
842 port->name[sizeof(port->name) - 1] = 0;
843 slen = strlen(port->name);
844 while (slen && (port->name[slen - 1] == ' ')) {
845 port->name[slen - 1] = 0;
846 slen--;
847 }
848
849 printk(KERN_INFO DRV_NAME "(%s): port %u device %Lu sectors\n",
850 pci_name(host->pdev), port->port_no,
851 (unsigned long long) port->capacity);
852 printk(KERN_INFO DRV_NAME "(%s): port %u device \"%s\"\n",
853 pci_name(host->pdev), port->port_no, port->name);
854
855 out:
856 assert(host->state == HST_DEV_SCAN);
857 schedule_work(&host->fsm_task);
858 }
859
carm_handle_scan_chan(struct carm_host * host,struct carm_request * crq,u8 * mem,blk_status_t error)860 static void carm_handle_scan_chan(struct carm_host *host,
861 struct carm_request *crq, u8 *mem,
862 blk_status_t error)
863 {
864 u8 *msg_data = mem + IOC_SCAN_CHAN_OFFSET;
865 unsigned int i, dev_count = 0;
866 int new_state = HST_DEV_SCAN_START;
867
868 DPRINTK("ENTER\n");
869
870 if (error) {
871 new_state = HST_ERROR;
872 goto out;
873 }
874
875 /* TODO: scan and support non-disk devices */
876 for (i = 0; i < 8; i++)
877 if (msg_data[i] == 0) { /* direct-access device (disk) */
878 host->dev_present |= (1 << i);
879 dev_count++;
880 }
881
882 printk(KERN_INFO DRV_NAME "(%s): found %u interesting devices\n",
883 pci_name(host->pdev), dev_count);
884
885 out:
886 assert(host->state == HST_PORT_SCAN);
887 host->state = new_state;
888 schedule_work(&host->fsm_task);
889 }
890
carm_handle_generic(struct carm_host * host,struct carm_request * crq,blk_status_t error,int cur_state,int next_state)891 static void carm_handle_generic(struct carm_host *host,
892 struct carm_request *crq, blk_status_t error,
893 int cur_state, int next_state)
894 {
895 DPRINTK("ENTER\n");
896
897 assert(host->state == cur_state);
898 if (error)
899 host->state = HST_ERROR;
900 else
901 host->state = next_state;
902 schedule_work(&host->fsm_task);
903 }
904
carm_handle_resp(struct carm_host * host,__le32 ret_handle_le,u32 status)905 static inline void carm_handle_resp(struct carm_host *host,
906 __le32 ret_handle_le, u32 status)
907 {
908 u32 handle = le32_to_cpu(ret_handle_le);
909 unsigned int msg_idx;
910 struct request *rq;
911 struct carm_request *crq;
912 blk_status_t error = (status == RMSG_OK) ? 0 : BLK_STS_IOERR;
913 u8 *mem;
914
915 VPRINTK("ENTER, handle == 0x%x\n", handle);
916
917 if (unlikely(!TAG_VALID(handle))) {
918 printk(KERN_ERR DRV_NAME "(%s): BUG: invalid tag 0x%x\n",
919 pci_name(host->pdev), handle);
920 return;
921 }
922
923 msg_idx = TAG_DECODE(handle);
924 VPRINTK("tag == %u\n", msg_idx);
925
926 rq = blk_mq_tag_to_rq(host->tag_set.tags[0], msg_idx);
927 crq = blk_mq_rq_to_pdu(rq);
928
929 /* fast path */
930 if (likely(crq->msg_type == CARM_MSG_READ ||
931 crq->msg_type == CARM_MSG_WRITE)) {
932 dma_unmap_sg(&host->pdev->dev, &crq->sg[0], crq->n_elem,
933 carm_rq_dir(rq));
934 goto done;
935 }
936
937 mem = carm_ref_msg(host, msg_idx);
938
939 switch (crq->msg_type) {
940 case CARM_MSG_IOCTL: {
941 switch (crq->msg_subtype) {
942 case CARM_IOC_SCAN_CHAN:
943 carm_handle_scan_chan(host, crq, mem, error);
944 goto done;
945 default:
946 /* unknown / invalid response */
947 goto err_out;
948 }
949 break;
950 }
951
952 case CARM_MSG_MISC: {
953 switch (crq->msg_subtype) {
954 case MISC_ALLOC_MEM:
955 carm_handle_generic(host, crq, error,
956 HST_ALLOC_BUF, HST_SYNC_TIME);
957 goto done;
958 case MISC_SET_TIME:
959 carm_handle_generic(host, crq, error,
960 HST_SYNC_TIME, HST_GET_FW_VER);
961 goto done;
962 case MISC_GET_FW_VER: {
963 struct carm_fw_ver *ver = (struct carm_fw_ver *)
964 (mem + sizeof(struct carm_msg_get_fw_ver));
965 if (!error) {
966 host->fw_ver = le32_to_cpu(ver->version);
967 host->flags |= (ver->features & FL_FW_VER_MASK);
968 }
969 carm_handle_generic(host, crq, error,
970 HST_GET_FW_VER, HST_PORT_SCAN);
971 goto done;
972 }
973 default:
974 /* unknown / invalid response */
975 goto err_out;
976 }
977 break;
978 }
979
980 case CARM_MSG_ARRAY: {
981 switch (crq->msg_subtype) {
982 case CARM_ARRAY_INFO:
983 carm_handle_array_info(host, crq, mem, error);
984 break;
985 default:
986 /* unknown / invalid response */
987 goto err_out;
988 }
989 break;
990 }
991
992 default:
993 /* unknown / invalid response */
994 goto err_out;
995 }
996
997 return;
998
999 err_out:
1000 printk(KERN_WARNING DRV_NAME "(%s): BUG: unhandled message type %d/%d\n",
1001 pci_name(host->pdev), crq->msg_type, crq->msg_subtype);
1002 error = BLK_STS_IOERR;
1003 done:
1004 host->hw_sg_used -= crq->n_elem;
1005 blk_mq_end_request(blk_mq_rq_from_pdu(crq), error);
1006
1007 if (host->hw_sg_used <= CARM_SG_LOW_WATER)
1008 carm_round_robin(host);
1009 }
1010
carm_handle_responses(struct carm_host * host)1011 static inline void carm_handle_responses(struct carm_host *host)
1012 {
1013 void __iomem *mmio = host->mmio;
1014 struct carm_response *resp = (struct carm_response *) host->shm;
1015 unsigned int work = 0;
1016 unsigned int idx = host->resp_idx % RMSG_Q_LEN;
1017
1018 while (1) {
1019 u32 status = le32_to_cpu(resp[idx].status);
1020
1021 if (status == 0xffffffff) {
1022 VPRINTK("ending response on index %u\n", idx);
1023 writel(idx << 3, mmio + CARM_RESP_IDX);
1024 break;
1025 }
1026
1027 /* response to a message we sent */
1028 else if ((status & (1 << 31)) == 0) {
1029 VPRINTK("handling msg response on index %u\n", idx);
1030 carm_handle_resp(host, resp[idx].ret_handle, status);
1031 resp[idx].status = cpu_to_le32(0xffffffff);
1032 }
1033
1034 /* asynchronous events the hardware throws our way */
1035 else if ((status & 0xff000000) == (1 << 31)) {
1036 u8 *evt_type_ptr = (u8 *) &resp[idx];
1037 u8 evt_type = *evt_type_ptr;
1038 printk(KERN_WARNING DRV_NAME "(%s): unhandled event type %d\n",
1039 pci_name(host->pdev), (int) evt_type);
1040 resp[idx].status = cpu_to_le32(0xffffffff);
1041 }
1042
1043 idx = NEXT_RESP(idx);
1044 work++;
1045 }
1046
1047 VPRINTK("EXIT, work==%u\n", work);
1048 host->resp_idx += work;
1049 }
1050
carm_interrupt(int irq,void * __host)1051 static irqreturn_t carm_interrupt(int irq, void *__host)
1052 {
1053 struct carm_host *host = __host;
1054 void __iomem *mmio;
1055 u32 mask;
1056 int handled = 0;
1057 unsigned long flags;
1058
1059 if (!host) {
1060 VPRINTK("no host\n");
1061 return IRQ_NONE;
1062 }
1063
1064 spin_lock_irqsave(&host->lock, flags);
1065
1066 mmio = host->mmio;
1067
1068 /* reading should also clear interrupts */
1069 mask = readl(mmio + CARM_INT_STAT);
1070
1071 if (mask == 0 || mask == 0xffffffff) {
1072 VPRINTK("no work, mask == 0x%x\n", mask);
1073 goto out;
1074 }
1075
1076 if (mask & INT_ACK_MASK)
1077 writel(mask, mmio + CARM_INT_STAT);
1078
1079 if (unlikely(host->state == HST_INVALID)) {
1080 VPRINTK("not initialized yet, mask = 0x%x\n", mask);
1081 goto out;
1082 }
1083
1084 if (mask & CARM_HAVE_RESP) {
1085 handled = 1;
1086 carm_handle_responses(host);
1087 }
1088
1089 out:
1090 spin_unlock_irqrestore(&host->lock, flags);
1091 VPRINTK("EXIT\n");
1092 return IRQ_RETVAL(handled);
1093 }
1094
carm_fsm_task(struct work_struct * work)1095 static void carm_fsm_task (struct work_struct *work)
1096 {
1097 struct carm_host *host =
1098 container_of(work, struct carm_host, fsm_task);
1099 unsigned long flags;
1100 unsigned int state;
1101 int rc, i, next_dev;
1102 int reschedule = 0;
1103 int new_state = HST_INVALID;
1104
1105 spin_lock_irqsave(&host->lock, flags);
1106 state = host->state;
1107 spin_unlock_irqrestore(&host->lock, flags);
1108
1109 DPRINTK("ENTER, state == %s\n", state_name[state]);
1110
1111 switch (state) {
1112 case HST_PROBE_START:
1113 new_state = HST_ALLOC_BUF;
1114 reschedule = 1;
1115 break;
1116
1117 case HST_ALLOC_BUF:
1118 rc = carm_send_special(host, carm_fill_alloc_buf);
1119 if (rc) {
1120 new_state = HST_ERROR;
1121 reschedule = 1;
1122 }
1123 break;
1124
1125 case HST_SYNC_TIME:
1126 rc = carm_send_special(host, carm_fill_sync_time);
1127 if (rc) {
1128 new_state = HST_ERROR;
1129 reschedule = 1;
1130 }
1131 break;
1132
1133 case HST_GET_FW_VER:
1134 rc = carm_send_special(host, carm_fill_get_fw_ver);
1135 if (rc) {
1136 new_state = HST_ERROR;
1137 reschedule = 1;
1138 }
1139 break;
1140
1141 case HST_PORT_SCAN:
1142 rc = carm_send_special(host, carm_fill_scan_channels);
1143 if (rc) {
1144 new_state = HST_ERROR;
1145 reschedule = 1;
1146 }
1147 break;
1148
1149 case HST_DEV_SCAN_START:
1150 host->cur_scan_dev = -1;
1151 new_state = HST_DEV_SCAN;
1152 reschedule = 1;
1153 break;
1154
1155 case HST_DEV_SCAN:
1156 next_dev = -1;
1157 for (i = host->cur_scan_dev + 1; i < CARM_MAX_PORTS; i++)
1158 if (host->dev_present & (1 << i)) {
1159 next_dev = i;
1160 break;
1161 }
1162
1163 if (next_dev >= 0) {
1164 host->cur_scan_dev = next_dev;
1165 rc = carm_array_info(host, next_dev);
1166 if (rc) {
1167 new_state = HST_ERROR;
1168 reschedule = 1;
1169 }
1170 } else {
1171 new_state = HST_DEV_ACTIVATE;
1172 reschedule = 1;
1173 }
1174 break;
1175
1176 case HST_DEV_ACTIVATE: {
1177 int activated = 0;
1178 for (i = 0; i < CARM_MAX_PORTS; i++)
1179 if (host->dev_active & (1 << i)) {
1180 struct carm_port *port = &host->port[i];
1181 struct gendisk *disk = port->disk;
1182
1183 set_capacity(disk, port->capacity);
1184 add_disk(disk);
1185 activated++;
1186 }
1187
1188 printk(KERN_INFO DRV_NAME "(%s): %d ports activated\n",
1189 pci_name(host->pdev), activated);
1190
1191 new_state = HST_PROBE_FINISHED;
1192 reschedule = 1;
1193 break;
1194 }
1195
1196 case HST_PROBE_FINISHED:
1197 complete(&host->probe_comp);
1198 break;
1199
1200 case HST_ERROR:
1201 /* FIXME: TODO */
1202 break;
1203
1204 default:
1205 /* should never occur */
1206 printk(KERN_ERR PFX "BUG: unknown state %d\n", state);
1207 assert(0);
1208 break;
1209 }
1210
1211 if (new_state != HST_INVALID) {
1212 spin_lock_irqsave(&host->lock, flags);
1213 host->state = new_state;
1214 spin_unlock_irqrestore(&host->lock, flags);
1215 }
1216 if (reschedule)
1217 schedule_work(&host->fsm_task);
1218 }
1219
carm_init_wait(void __iomem * mmio,u32 bits,unsigned int test_bit)1220 static int carm_init_wait(void __iomem *mmio, u32 bits, unsigned int test_bit)
1221 {
1222 unsigned int i;
1223
1224 for (i = 0; i < 50000; i++) {
1225 u32 tmp = readl(mmio + CARM_LMUC);
1226 udelay(100);
1227
1228 if (test_bit) {
1229 if ((tmp & bits) == bits)
1230 return 0;
1231 } else {
1232 if ((tmp & bits) == 0)
1233 return 0;
1234 }
1235
1236 cond_resched();
1237 }
1238
1239 printk(KERN_ERR PFX "carm_init_wait timeout, bits == 0x%x, test_bit == %s\n",
1240 bits, test_bit ? "yes" : "no");
1241 return -EBUSY;
1242 }
1243
carm_init_responses(struct carm_host * host)1244 static void carm_init_responses(struct carm_host *host)
1245 {
1246 void __iomem *mmio = host->mmio;
1247 unsigned int i;
1248 struct carm_response *resp = (struct carm_response *) host->shm;
1249
1250 for (i = 0; i < RMSG_Q_LEN; i++)
1251 resp[i].status = cpu_to_le32(0xffffffff);
1252
1253 writel(0, mmio + CARM_RESP_IDX);
1254 }
1255
carm_init_host(struct carm_host * host)1256 static int carm_init_host(struct carm_host *host)
1257 {
1258 void __iomem *mmio = host->mmio;
1259 u32 tmp;
1260 u8 tmp8;
1261 int rc;
1262
1263 DPRINTK("ENTER\n");
1264
1265 writel(0, mmio + CARM_INT_MASK);
1266
1267 tmp8 = readb(mmio + CARM_INITC);
1268 if (tmp8 & 0x01) {
1269 tmp8 &= ~0x01;
1270 writeb(tmp8, mmio + CARM_INITC);
1271 readb(mmio + CARM_INITC); /* flush */
1272
1273 DPRINTK("snooze...\n");
1274 msleep(5000);
1275 }
1276
1277 tmp = readl(mmio + CARM_HMUC);
1278 if (tmp & CARM_CME) {
1279 DPRINTK("CME bit present, waiting\n");
1280 rc = carm_init_wait(mmio, CARM_CME, 1);
1281 if (rc) {
1282 DPRINTK("EXIT, carm_init_wait 1 failed\n");
1283 return rc;
1284 }
1285 }
1286 if (tmp & CARM_RME) {
1287 DPRINTK("RME bit present, waiting\n");
1288 rc = carm_init_wait(mmio, CARM_RME, 1);
1289 if (rc) {
1290 DPRINTK("EXIT, carm_init_wait 2 failed\n");
1291 return rc;
1292 }
1293 }
1294
1295 tmp &= ~(CARM_RME | CARM_CME);
1296 writel(tmp, mmio + CARM_HMUC);
1297 readl(mmio + CARM_HMUC); /* flush */
1298
1299 rc = carm_init_wait(mmio, CARM_RME | CARM_CME, 0);
1300 if (rc) {
1301 DPRINTK("EXIT, carm_init_wait 3 failed\n");
1302 return rc;
1303 }
1304
1305 carm_init_buckets(mmio);
1306
1307 writel(host->shm_dma & 0xffffffff, mmio + RBUF_ADDR_LO);
1308 writel((host->shm_dma >> 16) >> 16, mmio + RBUF_ADDR_HI);
1309 writel(RBUF_LEN, mmio + RBUF_BYTE_SZ);
1310
1311 tmp = readl(mmio + CARM_HMUC);
1312 tmp |= (CARM_RME | CARM_CME | CARM_WZBC);
1313 writel(tmp, mmio + CARM_HMUC);
1314 readl(mmio + CARM_HMUC); /* flush */
1315
1316 rc = carm_init_wait(mmio, CARM_RME | CARM_CME, 1);
1317 if (rc) {
1318 DPRINTK("EXIT, carm_init_wait 4 failed\n");
1319 return rc;
1320 }
1321
1322 writel(0, mmio + CARM_HMPHA);
1323 writel(INT_DEF_MASK, mmio + CARM_INT_MASK);
1324
1325 carm_init_responses(host);
1326
1327 /* start initialization, probing state machine */
1328 spin_lock_irq(&host->lock);
1329 assert(host->state == HST_INVALID);
1330 host->state = HST_PROBE_START;
1331 spin_unlock_irq(&host->lock);
1332 schedule_work(&host->fsm_task);
1333
1334 DPRINTK("EXIT\n");
1335 return 0;
1336 }
1337
1338 static const struct blk_mq_ops carm_mq_ops = {
1339 .queue_rq = carm_queue_rq,
1340 };
1341
carm_init_disk(struct carm_host * host,unsigned int port_no)1342 static int carm_init_disk(struct carm_host *host, unsigned int port_no)
1343 {
1344 struct carm_port *port = &host->port[port_no];
1345 struct gendisk *disk;
1346
1347 port->host = host;
1348 port->port_no = port_no;
1349
1350 disk = blk_mq_alloc_disk(&host->tag_set, port);
1351 if (IS_ERR(disk))
1352 return PTR_ERR(disk);
1353
1354 port->disk = disk;
1355 sprintf(disk->disk_name, DRV_NAME "/%u",
1356 (unsigned int)host->id * CARM_MAX_PORTS + port_no);
1357 disk->major = host->major;
1358 disk->first_minor = port_no * CARM_MINORS_PER_MAJOR;
1359 disk->minors = CARM_MINORS_PER_MAJOR;
1360 disk->fops = &carm_bd_ops;
1361 disk->private_data = port;
1362
1363 blk_queue_max_segments(disk->queue, CARM_MAX_REQ_SG);
1364 blk_queue_segment_boundary(disk->queue, CARM_SG_BOUNDARY);
1365 return 0;
1366 }
1367
carm_free_disk(struct carm_host * host,unsigned int port_no)1368 static void carm_free_disk(struct carm_host *host, unsigned int port_no)
1369 {
1370 struct carm_port *port = &host->port[port_no];
1371 struct gendisk *disk = port->disk;
1372
1373 if (!disk)
1374 return;
1375
1376 if (host->state > HST_DEV_ACTIVATE)
1377 del_gendisk(disk);
1378 blk_cleanup_disk(disk);
1379 }
1380
carm_init_shm(struct carm_host * host)1381 static int carm_init_shm(struct carm_host *host)
1382 {
1383 host->shm = dma_alloc_coherent(&host->pdev->dev, CARM_SHM_SIZE,
1384 &host->shm_dma, GFP_KERNEL);
1385 if (!host->shm)
1386 return -ENOMEM;
1387
1388 host->msg_base = host->shm + RBUF_LEN;
1389 host->msg_dma = host->shm_dma + RBUF_LEN;
1390
1391 memset(host->shm, 0xff, RBUF_LEN);
1392 memset(host->msg_base, 0, PDC_SHM_SIZE - RBUF_LEN);
1393
1394 return 0;
1395 }
1396
carm_init_one(struct pci_dev * pdev,const struct pci_device_id * ent)1397 static int carm_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
1398 {
1399 struct carm_host *host;
1400 int rc;
1401 struct request_queue *q;
1402 unsigned int i;
1403
1404 printk_once(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
1405
1406 rc = pci_enable_device(pdev);
1407 if (rc)
1408 return rc;
1409
1410 rc = pci_request_regions(pdev, DRV_NAME);
1411 if (rc)
1412 goto err_out;
1413
1414 rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
1415 if (rc) {
1416 printk(KERN_ERR DRV_NAME "(%s): DMA mask failure\n",
1417 pci_name(pdev));
1418 goto err_out_regions;
1419 }
1420
1421 host = kzalloc(sizeof(*host), GFP_KERNEL);
1422 if (!host) {
1423 rc = -ENOMEM;
1424 goto err_out_regions;
1425 }
1426
1427 host->pdev = pdev;
1428 spin_lock_init(&host->lock);
1429 INIT_WORK(&host->fsm_task, carm_fsm_task);
1430 init_completion(&host->probe_comp);
1431
1432 host->mmio = ioremap(pci_resource_start(pdev, 0),
1433 pci_resource_len(pdev, 0));
1434 if (!host->mmio) {
1435 printk(KERN_ERR DRV_NAME "(%s): MMIO alloc failure\n",
1436 pci_name(pdev));
1437 rc = -ENOMEM;
1438 goto err_out_kfree;
1439 }
1440
1441 rc = carm_init_shm(host);
1442 if (rc) {
1443 printk(KERN_ERR DRV_NAME "(%s): DMA SHM alloc failure\n",
1444 pci_name(pdev));
1445 goto err_out_iounmap;
1446 }
1447
1448 memset(&host->tag_set, 0, sizeof(host->tag_set));
1449 host->tag_set.ops = &carm_mq_ops;
1450 host->tag_set.cmd_size = sizeof(struct carm_request);
1451 host->tag_set.nr_hw_queues = 1;
1452 host->tag_set.nr_maps = 1;
1453 host->tag_set.queue_depth = max_queue;
1454 host->tag_set.numa_node = NUMA_NO_NODE;
1455 host->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
1456
1457 rc = blk_mq_alloc_tag_set(&host->tag_set);
1458 if (rc)
1459 goto err_out_dma_free;
1460
1461 q = blk_mq_init_queue(&host->tag_set);
1462 if (IS_ERR(q)) {
1463 rc = PTR_ERR(q);
1464 blk_mq_free_tag_set(&host->tag_set);
1465 goto err_out_dma_free;
1466 }
1467
1468 host->oob_q = q;
1469 q->queuedata = host;
1470
1471 /*
1472 * Figure out which major to use: 160, 161, or dynamic
1473 */
1474 if (!test_and_set_bit(0, &carm_major_alloc))
1475 host->major = 160;
1476 else if (!test_and_set_bit(1, &carm_major_alloc))
1477 host->major = 161;
1478 else
1479 host->flags |= FL_DYN_MAJOR;
1480
1481 host->id = carm_host_id;
1482 sprintf(host->name, DRV_NAME "%d", carm_host_id);
1483
1484 rc = register_blkdev(host->major, host->name);
1485 if (rc < 0)
1486 goto err_out_free_majors;
1487 if (host->flags & FL_DYN_MAJOR)
1488 host->major = rc;
1489
1490 for (i = 0; i < CARM_MAX_PORTS; i++) {
1491 rc = carm_init_disk(host, i);
1492 if (rc)
1493 goto err_out_blkdev_disks;
1494 }
1495
1496 pci_set_master(pdev);
1497
1498 rc = request_irq(pdev->irq, carm_interrupt, IRQF_SHARED, DRV_NAME, host);
1499 if (rc) {
1500 printk(KERN_ERR DRV_NAME "(%s): irq alloc failure\n",
1501 pci_name(pdev));
1502 goto err_out_blkdev_disks;
1503 }
1504
1505 rc = carm_init_host(host);
1506 if (rc)
1507 goto err_out_free_irq;
1508
1509 DPRINTK("waiting for probe_comp\n");
1510 wait_for_completion(&host->probe_comp);
1511
1512 printk(KERN_INFO "%s: pci %s, ports %d, io %llx, irq %u, major %d\n",
1513 host->name, pci_name(pdev), (int) CARM_MAX_PORTS,
1514 (unsigned long long)pci_resource_start(pdev, 0),
1515 pdev->irq, host->major);
1516
1517 carm_host_id++;
1518 pci_set_drvdata(pdev, host);
1519 return 0;
1520
1521 err_out_free_irq:
1522 free_irq(pdev->irq, host);
1523 err_out_blkdev_disks:
1524 for (i = 0; i < CARM_MAX_PORTS; i++)
1525 carm_free_disk(host, i);
1526 unregister_blkdev(host->major, host->name);
1527 err_out_free_majors:
1528 if (host->major == 160)
1529 clear_bit(0, &carm_major_alloc);
1530 else if (host->major == 161)
1531 clear_bit(1, &carm_major_alloc);
1532 blk_cleanup_queue(host->oob_q);
1533 blk_mq_free_tag_set(&host->tag_set);
1534 err_out_dma_free:
1535 dma_free_coherent(&pdev->dev, CARM_SHM_SIZE, host->shm, host->shm_dma);
1536 err_out_iounmap:
1537 iounmap(host->mmio);
1538 err_out_kfree:
1539 kfree(host);
1540 err_out_regions:
1541 pci_release_regions(pdev);
1542 err_out:
1543 pci_disable_device(pdev);
1544 return rc;
1545 }
1546
carm_remove_one(struct pci_dev * pdev)1547 static void carm_remove_one (struct pci_dev *pdev)
1548 {
1549 struct carm_host *host = pci_get_drvdata(pdev);
1550 unsigned int i;
1551
1552 if (!host) {
1553 printk(KERN_ERR PFX "BUG: no host data for PCI(%s)\n",
1554 pci_name(pdev));
1555 return;
1556 }
1557
1558 free_irq(pdev->irq, host);
1559 for (i = 0; i < CARM_MAX_PORTS; i++)
1560 carm_free_disk(host, i);
1561 unregister_blkdev(host->major, host->name);
1562 if (host->major == 160)
1563 clear_bit(0, &carm_major_alloc);
1564 else if (host->major == 161)
1565 clear_bit(1, &carm_major_alloc);
1566 blk_cleanup_queue(host->oob_q);
1567 blk_mq_free_tag_set(&host->tag_set);
1568 dma_free_coherent(&pdev->dev, CARM_SHM_SIZE, host->shm, host->shm_dma);
1569 iounmap(host->mmio);
1570 kfree(host);
1571 pci_release_regions(pdev);
1572 pci_disable_device(pdev);
1573 }
1574
1575 module_pci_driver(carm_driver);
1576
