summaryrefslogtreecommitdiffstats
path: root/include/scsi/libsas.h
blob: 8dda2d66b5b92bcb61fd03c3e5fde16ce4bdb3ff (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
/*
 * SAS host prototypes and structures header file
 *
 * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
 *
 * This file is licensed under GPLv2.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 *
 */

#ifndef _LIBSAS_H_
#define _LIBSAS_H_


#include <linux/timer.h>
#include <linux/pci.h>
#include <scsi/sas.h>
#include <linux/libata.h>
#include <linux/list.h>
#include <asm/semaphore.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_transport_sas.h>
#include <asm/scatterlist.h>

struct block_device;

enum sas_class {
	SAS,
	EXPANDER
};

enum sas_phy_role {
	PHY_ROLE_NONE = 0,
	PHY_ROLE_TARGET = 0x40,
	PHY_ROLE_INITIATOR = 0x80,
};

enum sas_phy_type {
        PHY_TYPE_PHYSICAL,
        PHY_TYPE_VIRTUAL
};

/* The events are mnemonically described in sas_dump.c
 * so when updating/adding events here, please also
 * update the other file too.
 */
enum ha_event {
	HAE_RESET             = 0U,
	HA_NUM_EVENTS         = 1,
};

enum port_event {
	PORTE_BYTES_DMAED     = 0U,
	PORTE_BROADCAST_RCVD  = 1,
	PORTE_LINK_RESET_ERR  = 2,
	PORTE_TIMER_EVENT     = 3,
	PORTE_HARD_RESET      = 4,
	PORT_NUM_EVENTS       = 5,
};

enum phy_event {
	PHYE_LOSS_OF_SIGNAL   = 0U,
	PHYE_OOB_DONE         = 1,
	PHYE_OOB_ERROR        = 2,
	PHYE_SPINUP_HOLD      = 3, /* hot plug SATA, no COMWAKE sent */
	PHY_NUM_EVENTS        = 4,
};

enum discover_event {
	DISCE_DISCOVER_DOMAIN   = 0U,
	DISCE_REVALIDATE_DOMAIN = 1,
	DISCE_PORT_GONE         = 2,
	DISC_NUM_EVENTS 	= 3,
};

/* ---------- Expander Devices ---------- */

#define ETASK 0xFA

#define to_dom_device(_obj) container_of(_obj, struct domain_device, dev_obj)
#define to_dev_attr(_attr)  container_of(_attr, struct domain_dev_attribute,\
                                         attr)

enum routing_attribute {
	DIRECT_ROUTING,
	SUBTRACTIVE_ROUTING,
	TABLE_ROUTING,
};

enum ex_phy_state {
	PHY_EMPTY,
	PHY_VACANT,
	PHY_NOT_PRESENT,
	PHY_DEVICE_DISCOVERED
};

struct ex_phy {
	int    phy_id;

	enum ex_phy_state phy_state;

	enum sas_dev_type attached_dev_type;
	enum sas_linkrate linkrate;

	u8   attached_sata_host:1;
	u8   attached_sata_dev:1;
	u8   attached_sata_ps:1;

	enum sas_proto attached_tproto;
	enum sas_proto attached_iproto;

	u8   attached_sas_addr[SAS_ADDR_SIZE];
	u8   attached_phy_id;

	u8   phy_change_count;
	enum routing_attribute routing_attr;
	u8   virtual:1;

	int  last_da_index;

	struct sas_phy *phy;
	struct sas_port *port;
};

struct expander_device {
	struct list_head children;

	u16    ex_change_count;
	u16    max_route_indexes;
	u8     num_phys;
	u8     configuring:1;
	u8     conf_route_table:1;
	u8     enclosure_logical_id[8];

	struct ex_phy *ex_phy;
	struct sas_port *parent_port;
};

/* ---------- SATA device ---------- */
enum ata_command_set {
        ATA_COMMAND_SET   = 0,
        ATAPI_COMMAND_SET = 1,
};

struct sata_device {
        enum   ata_command_set command_set;
        struct smp_resp        rps_resp; /* report_phy_sata_resp */
        __le16 *identify_device;
        __le16 *identify_packet_device;

        u8     port_no;        /* port number, if this is a PM (Port) */
        struct list_head children; /* PM Ports if this is a PM */

	struct ata_port *ap;
	struct ata_host ata_host;
	struct ata_taskfile tf;
	u32 sstatus;
	u32 serror;
	u32 scontrol;
};

/* ---------- Domain device ---------- */
struct domain_device {
        enum sas_dev_type dev_type;

        enum sas_linkrate linkrate;
        enum sas_linkrate min_linkrate;
        enum sas_linkrate max_linkrate;

        int  pathways;

        struct domain_device *parent;
        struct list_head siblings; /* devices on the same level */
        struct asd_sas_port *port;        /* shortcut to root of the tree */

        struct list_head dev_list_node;

        enum sas_proto    iproto;
        enum sas_proto    tproto;

        struct sas_rphy *rphy;

        u8  sas_addr[SAS_ADDR_SIZE];
        u8  hashed_sas_addr[HASHED_SAS_ADDR_SIZE];

        u8  frame_rcvd[32];

        union {
                struct expander_device ex_dev;
                struct sata_device     sata_dev; /* STP & directly attached */
        };

        void *lldd_dev;
};

struct sas_discovery_event {
	struct work_struct work;
	struct asd_sas_port *port;
};

struct sas_discovery {
	spinlock_t disc_event_lock;
	struct sas_discovery_event disc_work[DISC_NUM_EVENTS];
	unsigned long    pending;
	u8     fanout_sas_addr[8];
	u8     eeds_a[8];
	u8     eeds_b[8];
	int    max_level;
};


/* The port struct is Class:RW, driver:RO */
struct asd_sas_port {
/* private: */
	struct completion port_gone_completion;

	struct sas_discovery disc;
	struct domain_device *port_dev;
	spinlock_t dev_list_lock;
	struct list_head dev_list;
	enum   sas_linkrate linkrate;

	struct sas_phy *phy;
	struct work_struct work;

/* public: */
	int id;

	enum sas_class   class;
	u8               sas_addr[SAS_ADDR_SIZE];
	u8               attached_sas_addr[SAS_ADDR_SIZE];
	enum sas_proto   iproto;
	enum sas_proto   tproto;

	enum sas_oob_mode oob_mode;

	spinlock_t       phy_list_lock;
	struct list_head phy_list;
	int              num_phys;
	u32              phy_mask;

	struct sas_ha_struct *ha;

	struct sas_port	*port;

	void *lldd_port;	  /* not touched by the sas class code */
};

struct asd_sas_event {
	struct work_struct work;
	struct asd_sas_phy *phy;
};

/* The phy pretty much is controlled by the LLDD.
 * The class only reads those fields.
 */
struct asd_sas_phy {
/* private: */
	/* protected by ha->event_lock */
	struct asd_sas_event   port_events[PORT_NUM_EVENTS];
	struct asd_sas_event   phy_events[PHY_NUM_EVENTS];

	unsigned long port_events_pending;
	unsigned long phy_events_pending;

	int error;

	struct sas_phy *phy;

/* public: */
	/* The following are class:RO, driver:R/W */
	int            enabled;	  /* must be set */

	int            id;	  /* must be set */
	enum sas_class class;
	enum sas_proto iproto;
	enum sas_proto tproto;

	enum sas_phy_type  type;
	enum sas_phy_role  role;
	enum sas_oob_mode  oob_mode;
	enum sas_linkrate linkrate;

	u8   *sas_addr;		  /* must be set */
	u8   attached_sas_addr[SAS_ADDR_SIZE]; /* class:RO, driver: R/W */

	spinlock_t     frame_rcvd_lock;
	u8             *frame_rcvd; /* must be set */
	int            frame_rcvd_size;

	spinlock_t     sas_prim_lock;
	u32            sas_prim;

	struct list_head port_phy_el; /* driver:RO */
	struct asd_sas_port      *port; /* Class:RW, driver: RO */

	struct sas_ha_struct *ha; /* may be set; the class sets it anyway */

	void *lldd_phy;		  /* not touched by the sas_class_code */
};

struct scsi_core {
	struct Scsi_Host *shost;

	spinlock_t        task_queue_lock;
	struct list_head  task_queue;
	int               task_queue_size;

	struct task_struct *queue_thread;
};

struct sas_ha_event {
	struct work_struct work;
	struct sas_ha_struct *ha;
};

enum sas_ha_state {
	SAS_HA_REGISTERED,
	SAS_HA_UNREGISTERED
};

struct sas_ha_struct {
/* private: */
	spinlock_t       event_lock;
	struct sas_ha_event ha_events[HA_NUM_EVENTS];
	unsigned long	 pending;

	enum sas_ha_state state;
	spinlock_t 	  state_lock;

	struct scsi_core core;

/* public: */
	char *sas_ha_name;
	struct device *dev;	  /* should be set */
	struct module *lldd_module; /* should be set */

	u8 *sas_addr;		  /* must be set */
	u8 hashed_sas_addr[HASHED_SAS_ADDR_SIZE];

	spinlock_t      phy_port_lock;
	struct asd_sas_phy  **sas_phy; /* array of valid pointers, must be set */
	struct asd_sas_port **sas_port; /* array of valid pointers, must be set */
	int             num_phys; /* must be set, gt 0, static */

	/* The class calls this to send a task for execution. */
	int lldd_max_execute_num;
	int lldd_queue_size;

	/* LLDD calls these to notify the class of an event. */
	void (*notify_ha_event)(struct sas_ha_struct *, enum ha_event);
	void (*notify_port_event)(struct asd_sas_phy *, enum port_event);
	void (*notify_phy_event)(struct asd_sas_phy *, enum phy_event);

	void *lldd_ha;		  /* not touched by sas class code */

	struct list_head eh_done_q;
};

#define SHOST_TO_SAS_HA(_shost) (*(struct sas_ha_struct **)(_shost)->hostdata)

static inline struct domain_device *
starget_to_domain_dev(struct scsi_target *starget) {
	return starget->hostdata;
}

static inline struct domain_device *
sdev_to_domain_dev(struct scsi_device *sdev) {
	return starget_to_domain_dev(sdev->sdev_target);
}

static inline struct domain_device *
cmd_to_domain_dev(struct scsi_cmnd *cmd)
{
	return sdev_to_domain_dev(cmd->device);
}

void sas_hash_addr(u8 *hashed, const u8 *sas_addr);

/* Before calling a notify event, LLDD should use this function
 * when the link is severed (possibly from its tasklet).
 * The idea is that the Class only reads those, while the LLDD,
 * can R/W these (thus avoiding a race).
 */
static inline void sas_phy_disconnected(struct asd_sas_phy *phy)
{
	phy->oob_mode = OOB_NOT_CONNECTED;
	phy->linkrate = SAS_LINK_RATE_UNKNOWN;
}

/* ---------- Tasks ---------- */
/*
      service_response |  SAS_TASK_COMPLETE  |  SAS_TASK_UNDELIVERED |
  exec_status          |                     |                       |
  ---------------------+---------------------+-----------------------+
       SAM_...         |         X           |                       |
       DEV_NO_RESPONSE |         X           |           X           |
       INTERRUPTED     |         X           |                       |
       QUEUE_FULL      |                     |           X           |
       DEVICE_UNKNOWN  |                     |           X           |
       SG_ERR          |                     |           X           |
  ---------------------+---------------------+-----------------------+
 */

enum service_response {
	SAS_TASK_COMPLETE,
	SAS_TASK_UNDELIVERED = -1,
};

enum exec_status {
	SAM_GOOD         = 0,
	SAM_CHECK_COND   = 2,
	SAM_COND_MET     = 4,
	SAM_BUSY         = 8,
	SAM_INTERMEDIATE = 0x10,
	SAM_IM_COND_MET  = 0x12,
	SAM_RESV_CONFLICT= 0x14,
	SAM_TASK_SET_FULL= 0x28,
	SAM_ACA_ACTIVE   = 0x30,
	SAM_TASK_ABORTED = 0x40,

	SAS_DEV_NO_RESPONSE = 0x80,
	SAS_DATA_UNDERRUN,
	SAS_DATA_OVERRUN,
	SAS_INTERRUPTED,
	SAS_QUEUE_FULL,
	SAS_DEVICE_UNKNOWN,
	SAS_SG_ERR,
	SAS_OPEN_REJECT,
	SAS_OPEN_TO,
	SAS_PROTO_RESPONSE,
	SAS_PHY_DOWN,
	SAS_NAK_R_ERR,
	SAS_PENDING,
	SAS_ABORTED_TASK,
};

/* When a task finishes with a response, the LLDD examines the
 * response:
 * 	- For an ATA task task_status_struct::stat is set to
 * SAS_PROTO_RESPONSE, and the task_status_struct::buf is set to the
 * contents of struct ata_task_resp.
 * 	- For SSP tasks, if no data is present or status/TMF response
 * is valid, task_status_struct::stat is set.  If data is present
 * (SENSE data), the LLDD copies up to SAS_STATUS_BUF_SIZE, sets
 * task_status_struct::buf_valid_size, and task_status_struct::stat is
 * set to SAM_CHECK_COND.
 *
 * "buf" has format SCSI Sense for SSP task, or struct ata_task_resp
 * for ATA task.
 *
 * "frame_len" is the total frame length, which could be more or less
 * than actually copied.
 *
 * Tasks ending with response, always set the residual field.
 */
struct ata_task_resp {
	u16  frame_len;
	u8   ending_fis[24];	  /* dev to host or data-in */
	u32  sstatus;
	u32  serror;
	u32  scontrol;
	u32  sactive;
};

#define SAS_STATUS_BUF_SIZE 96

struct task_status_struct {
	enum service_response resp;
	enum exec_status      stat;
	int  buf_valid_size;

	u8   buf[SAS_STATUS_BUF_SIZE];

	u32  residual;
	enum sas_open_rej_reason open_rej_reason;
};

/* ATA and ATAPI task queuable to a SAS LLDD.
 */
struct sas_ata_task {
	struct host_to_dev_fis fis;
	u8     atapi_packet[16];  /* 0 if not ATAPI task */

	u8     retry_count;	  /* hardware retry, should be > 0 */

	u8     dma_xfer:1;	  /* PIO:0 or DMA:1 */
	u8     use_ncq:1;
	u8     set_affil_pol:1;
	u8     stp_affil_pol:1;

	u8     device_control_reg_update:1;
};

struct sas_smp_task {
	struct scatterlist smp_req;
	struct scatterlist smp_resp;
};

enum task_attribute {
	TASK_ATTR_SIMPLE = 0,
	TASK_ATTR_HOQ    = 1,
	TASK_ATTR_ORDERED= 2,
	TASK_ATTR_ACA    = 4,
};

struct sas_ssp_task {
	u8     retry_count;	  /* hardware retry, should be > 0 */

	u8     LUN[8];
	u8     enable_first_burst:1;
	enum   task_attribute task_attr;
	u8     task_prio;
	u8     cdb[16];
};

struct sas_task {
	struct domain_device *dev;
	struct list_head      list;

	spinlock_t   task_state_lock;
	unsigned     task_state_flags;

	enum   sas_proto      task_proto;

	/* Used by the discovery code. */
	struct timer_list     timer;
	struct completion     completion;

	union {
		struct sas_ata_task ata_task;
		struct sas_smp_task smp_task;
		struct sas_ssp_task ssp_task;
	};

	struct scatterlist *scatter;
	int    num_scatter;
	u32    total_xfer_len;
	u8     data_dir:2;	  /* Use PCI_DMA_... */

	struct task_status_struct task_status;
	void   (*task_done)(struct sas_task *);

	void   *lldd_task;	  /* for use by LLDDs */
	void   *uldd_task;

	struct work_struct abort_work;
};



#define SAS_TASK_STATE_PENDING      1
#define SAS_TASK_STATE_DONE         2
#define SAS_TASK_STATE_ABORTED      4
#define SAS_TASK_NEED_DEV_RESET     8
#define SAS_TASK_AT_INITIATOR       16

static inline struct sas_task *sas_alloc_task(gfp_t flags)
{
	extern struct kmem_cache *sas_task_cache;
	struct sas_task *task = kmem_cache_zalloc(sas_task_cache, flags);

	if (task) {
		INIT_LIST_HEAD(&task->list);
		spin_lock_init(&task->task_state_lock);
		task->task_state_flags = SAS_TASK_STATE_PENDING;
		init_timer(&task->timer);
		init_completion(&task->completion);
	}

	return task;
}

static inline void sas_free_task(struct sas_task *task)
{
	if (task) {
		extern struct kmem_cache *sas_task_cache;
		BUG_ON(!list_empty(&task->list));
		kmem_cache_free(sas_task_cache, task);
	}
}

struct sas_domain_function_template {
	/* The class calls these to notify the LLDD of an event. */
	void (*lldd_port_formed)(struct asd_sas_phy *);
	void (*lldd_port_deformed)(struct asd_sas_phy *);

	/* The class calls these when a device is found or gone. */
	int  (*lldd_dev_found)(struct domain_device *);
	void (*lldd_dev_gone)(struct domain_device *);

	int (*lldd_execute_task)(struct sas_task *, int num,
				 gfp_t gfp_flags);

	/* Task Management Functions. Must be called from process context. */
	int (*lldd_abort_task)(struct sas_task *);
	int (*lldd_abort_task_set)(struct domain_device *, u8 *lun);
	int (*lldd_clear_aca)(struct domain_device *, u8 *lun);
	int (*lldd_clear_task_set)(struct domain_device *, u8 *lun);
	int (*lldd_I_T_nexus_reset)(struct domain_device *);
	int (*lldd_lu_reset)(struct domain_device *, u8 *lun);
	int (*lldd_query_task)(struct sas_task *);

	/* Port and Adapter management */
	int (*lldd_clear_nexus_port)(struct asd_sas_port *);
	int (*lldd_clear_nexus_ha)(struct sas_ha_struct *);

	/* Phy management */
	int (*lldd_control_phy)(struct asd_sas_phy *, enum phy_func, void *);
};

extern int sas_register_ha(struct sas_ha_struct *);
extern int sas_unregister_ha(struct sas_ha_struct *);

int sas_set_phy_speed(struct sas_phy *phy,
		      struct sas_phy_linkrates *rates);
int sas_phy_enable(struct sas_phy *phy, int enabled);
int sas_phy_reset(struct sas_phy *phy, int hard_reset);
int sas_queue_up(struct sas_task *task);
extern int sas_queuecommand(struct scsi_cmnd *,
		     void (*scsi_done)(struct scsi_cmnd *));
extern int sas_target_alloc(struct scsi_target *);
extern int sas_slave_alloc(struct scsi_device *);
extern int sas_slave_configure(struct scsi_device *);
extern void sas_slave_destroy(struct scsi_device *);
extern int sas_change_queue_depth(struct scsi_device *, int new_depth);
extern int sas_change_queue_type(struct scsi_device *, int qt);
extern int sas_bios_param(struct scsi_device *,
			  struct block_device *,
			  sector_t capacity, int *hsc);
extern struct scsi_transport_template *
sas_domain_attach_transport(struct sas_domain_function_template *);
extern void sas_domain_release_transport(struct scsi_transport_template *);

int  sas_discover_root_expander(struct domain_device *);

void sas_init_ex_attr(void);

int  sas_ex_revalidate_domain(struct domain_device *);

void sas_unregister_domain_devices(struct asd_sas_port *port);
void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *);
int  sas_discover_event(struct asd_sas_port *, enum discover_event ev);

int  sas_discover_sata(struct domain_device *);
int  sas_discover_end_dev(struct domain_device *);

void sas_unregister_dev(struct domain_device *);

void sas_init_dev(struct domain_device *);

void sas_task_abort(struct sas_task *);
int __sas_task_abort(struct sas_task *);
int sas_eh_device_reset_handler(struct scsi_cmnd *cmd);
int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd);

extern void sas_target_destroy(struct scsi_target *);
extern int sas_slave_alloc(struct scsi_device *);
extern int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg);

extern int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
			   struct request *req);
#endif /* _SASLIB_H_ */
OpenPOWER on IntegriCloud