summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/isci/request.h
blob: 7628decbd535621897944777f59debbe6985519d (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
/*
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * 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., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 * The full GNU General Public License is included in this distribution
 * in the file called LICENSE.GPL.
 *
 * BSD LICENSE
 *
 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *   * Neither the name of Intel Corporation nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _ISCI_REQUEST_H_
#define _ISCI_REQUEST_H_

#include "isci.h"
#include "host.h"
#include "scu_task_context.h"

/**
 * struct isci_request_status - This enum defines the possible states of an I/O
 *    request.
 *
 *
 */
enum isci_request_status {
	unallocated = 0x00,
	allocated   = 0x01,
	started     = 0x02,
	completed   = 0x03,
	aborting    = 0x04,
	aborted     = 0x05,
	terminating = 0x06,
	dead        = 0x07
};

enum task_type {
	io_task  = 0,
	tmf_task = 1
};

enum sci_request_protocol {
	SCIC_NO_PROTOCOL,
	SCIC_SMP_PROTOCOL,
	SCIC_SSP_PROTOCOL,
	SCIC_STP_PROTOCOL
}; /* XXX remove me, use sas_task.{dev|task_proto} instead */;

struct scic_sds_stp_request {
	union {
		u32 ncq;

		u32 udma;

		struct scic_sds_stp_pio_request {
			/*
			 * Total transfer for the entire PIO request recorded
			 * at request constuction time.
			 *
			 * @todo Should we just decrement this value for each
			 * byte of data transitted or received to elemenate
			 * the current_transfer_bytes field?
			 */
			u32 total_transfer_bytes;

			/*
			 * Total number of bytes received/transmitted in data
			 * frames since the start of the IO request.  At the
			 * end of the IO request this should equal the
			 * total_transfer_bytes.
			 */
			u32 current_transfer_bytes;

			/*
			 * The number of bytes requested in the in the PIO
			 * setup.
			 */
			u32 pio_transfer_bytes;

			/*
			 * PIO Setup ending status value to tell us if we need
			 * to wait for another FIS or if the transfer is
			 * complete. On the receipt of a D2H FIS this will be
			 * the status field of that FIS.
			 */
			u8 ending_status;

			/*
			 * On receipt of a D2H FIS this will be the ending
			 * error field if the ending_status has the
			 * SATA_STATUS_ERR bit set.
			 */
			u8 ending_error;

			struct scic_sds_request_pio_sgl {
				int sgl_index;
				u8 sgl_set;
				u32 sgl_offset;
			} request_current;
		} pio;

		struct {
			/*
			 * The number of bytes requested in the PIO setup
			 * before CDB data frame.
			 */
			u32 device_preferred_cdb_length;
		} packet;
	} type;
};

struct scic_sds_request {
	/*
	 * This field contains the information for the base request state
	 * machine.
	 */
	struct sci_base_state_machine sm;

	/*
	 * This field simply points to the controller to which this IO request
	 * is associated.
	 */
	struct scic_sds_controller *owning_controller;

	/*
	 * This field simply points to the remote device to which this IO
	 * request is associated.
	 */
	struct scic_sds_remote_device *target_device;

	/*
	 * This field indicates the IO tag for this request.  The IO tag is
	 * comprised of the task_index and a sequence count. The sequence count
	 * is utilized to help identify tasks from one life to another.
	 */
	u16 io_tag;

	/*
	 * This field specifies the protocol being utilized for this
	 * IO request.
	 */
	enum sci_request_protocol protocol;

	/*
	 * This field indicates the completion status taken from the SCUs
	 * completion code.  It indicates the completion result for the SCU
	 * hardware.
	 */
	u32 scu_status;

	/*
	 * This field indicates the completion status returned to the SCI user.
	 * It indicates the users view of the io request completion.
	 */
	u32 sci_status;

	/*
	 * This field contains the value to be utilized when posting
	 * (e.g. Post_TC, * Post_TC_Abort) this request to the silicon.
	 */
	u32 post_context;

	struct scu_task_context *tc;

	/* could be larger with sg chaining */
	#define SCU_SGL_SIZE ((SCI_MAX_SCATTER_GATHER_ELEMENTS + 1) / 2)
	struct scu_sgl_element_pair sg_table[SCU_SGL_SIZE] __attribute__ ((aligned(32)));

	/*
	 * This field is a pointer to the stored rx frame data.  It is used in
	 * STP internal requests and SMP response frames.  If this field is
	 * non-NULL the saved frame must be released on IO request completion.
	 *
	 * @todo In the future do we want to keep a list of RX frame buffers?
	 */
	u32 saved_rx_frame_index;

	union {
		struct {
			union {
				struct ssp_cmd_iu cmd;
				struct ssp_task_iu tmf;
			};
			union {
				struct ssp_response_iu rsp;
				u8 rsp_buf[SSP_RESP_IU_MAX_SIZE];
			};
		} ssp;

		struct {
			struct smp_resp rsp;
		} smp;

		struct {
			struct scic_sds_stp_request req;
			struct host_to_dev_fis cmd;
			struct dev_to_host_fis rsp;
		} stp;
	};
};

static inline struct scic_sds_request *to_sci_req(struct scic_sds_stp_request *stp_req)
{
	struct scic_sds_request *sci_req;

	sci_req = container_of(stp_req, typeof(*sci_req), stp.req);
	return sci_req;
}

struct isci_request {
	enum isci_request_status status;
	enum task_type ttype;
	unsigned short io_tag;
	#define IREQ_COMPLETE_IN_TARGET 0
	#define IREQ_TERMINATED 1
	#define IREQ_TMF 2
	#define IREQ_ACTIVE 3
	unsigned long flags;

	union ttype_ptr_union {
		struct sas_task *io_task_ptr;   /* When ttype==io_task  */
		struct isci_tmf *tmf_task_ptr;  /* When ttype==tmf_task */
	} ttype_ptr;
	struct isci_host *isci_host;
	/* For use in the requests_to_{complete|abort} lists: */
	struct list_head completed_node;
	/* For use in the reqs_in_process list: */
	struct list_head dev_node;
	spinlock_t state_lock;
	dma_addr_t request_daddr;
	dma_addr_t zero_scatter_daddr;

	unsigned int num_sg_entries;			/* returned by pci_alloc_sg */

	/** Note: "io_request_completion" is completed in two different ways
	 * depending on whether this is a TMF or regular request.
	 * - TMF requests are completed in the thread that started them;
	 * - regular requests are completed in the request completion callback
	 *   function.
	 * This difference in operation allows the aborter of a TMF request
	 * to be sure that once the TMF request completes, the I/O that the
	 * TMF was aborting is guaranteed to have completed.
	 */
	struct completion *io_request_completion;
	struct scic_sds_request sci;
};

static inline struct isci_request *sci_req_to_ireq(struct scic_sds_request *sci_req)
{
	struct isci_request *ireq = container_of(sci_req, typeof(*ireq), sci);

	return ireq;
}

/**
 * enum sci_base_request_states - This enumeration depicts all the states for
 *    the common request state machine.
 *
 *
 */
enum sci_base_request_states {
	/*
	 * Simply the initial state for the base request state machine.
	 */
	SCI_REQ_INIT,

	/*
	 * This state indicates that the request has been constructed.
	 * This state is entered from the INITIAL state.
	 */
	SCI_REQ_CONSTRUCTED,

	/*
	 * This state indicates that the request has been started. This state
	 * is entered from the CONSTRUCTED state.
	 */
	SCI_REQ_STARTED,

	SCI_REQ_STP_UDMA_WAIT_TC_COMP,
	SCI_REQ_STP_UDMA_WAIT_D2H,

	SCI_REQ_STP_NON_DATA_WAIT_H2D,
	SCI_REQ_STP_NON_DATA_WAIT_D2H,

	SCI_REQ_STP_SOFT_RESET_WAIT_H2D_ASSERTED,
	SCI_REQ_STP_SOFT_RESET_WAIT_H2D_DIAG,
	SCI_REQ_STP_SOFT_RESET_WAIT_D2H,

	/*
	 * While in this state the IO request object is waiting for the TC
	 * completion notification for the H2D Register FIS
	 */
	SCI_REQ_STP_PIO_WAIT_H2D,

	/*
	 * While in this state the IO request object is waiting for either a
	 * PIO Setup FIS or a D2H register FIS.  The type of frame received is
	 * based on the result of the prior frame and line conditions.
	 */
	SCI_REQ_STP_PIO_WAIT_FRAME,

	/*
	 * While in this state the IO request object is waiting for a DATA
	 * frame from the device.
	 */
	SCI_REQ_STP_PIO_DATA_IN,

	/*
	 * While in this state the IO request object is waiting to transmit
	 * the next data frame to the device.
	 */
	SCI_REQ_STP_PIO_DATA_OUT,

	/*
	 * The AWAIT_TC_COMPLETION sub-state indicates that the started raw
	 * task management request is waiting for the transmission of the
	 * initial frame (i.e. command, task, etc.).
	 */
	SCI_REQ_TASK_WAIT_TC_COMP,

	/*
	 * This sub-state indicates that the started task management request
	 * is waiting for the reception of an unsolicited frame
	 * (i.e. response IU).
	 */
	SCI_REQ_TASK_WAIT_TC_RESP,

	/*
	 * This sub-state indicates that the started task management request
	 * is waiting for the reception of an unsolicited frame
	 * (i.e. response IU).
	 */
	SCI_REQ_SMP_WAIT_RESP,

	/*
	 * The AWAIT_TC_COMPLETION sub-state indicates that the started SMP
	 * request is waiting for the transmission of the initial frame
	 * (i.e. command, task, etc.).
	 */
	SCI_REQ_SMP_WAIT_TC_COMP,

	/*
	 * This state indicates that the request has completed.
	 * This state is entered from the STARTED state. This state is entered
	 * from the ABORTING state.
	 */
	SCI_REQ_COMPLETED,

	/*
	 * This state indicates that the request is in the process of being
	 * terminated/aborted.
	 * This state is entered from the CONSTRUCTED state.
	 * This state is entered from the STARTED state.
	 */
	SCI_REQ_ABORTING,

	/*
	 * Simply the final state for the base request state machine.
	 */
	SCI_REQ_FINAL,
};

/**
 * scic_sds_request_get_controller() -
 *
 * This macro will return the controller for this io request object
 */
#define scic_sds_request_get_controller(sci_req) \
	((sci_req)->owning_controller)

/**
 * scic_sds_request_get_device() -
 *
 * This macro will return the device for this io request object
 */
#define scic_sds_request_get_device(sci_req) \
	((sci_req)->target_device)

/**
 * scic_sds_request_get_port() -
 *
 * This macro will return the port for this io request object
 */
#define scic_sds_request_get_port(sci_req)	\
	scic_sds_remote_device_get_port(scic_sds_request_get_device(sci_req))

/**
 * scic_sds_request_get_post_context() -
 *
 * This macro returns the constructed post context result for the io request.
 */
#define scic_sds_request_get_post_context(sci_req)	\
	((sci_req)->post_context)

/**
 * scic_sds_request_get_task_context() -
 *
 * This is a helper macro to return the os handle for this request object.
 */
#define scic_sds_request_get_task_context(request) \
	((request)->task_context_buffer)

/**
 * scic_sds_request_set_status() -
 *
 * This macro will set the scu hardware status and sci request completion
 * status for an io request.
 */
#define scic_sds_request_set_status(request, scu_status_code, sci_status_code) \
	{ \
		(request)->scu_status = (scu_status_code); \
		(request)->sci_status = (sci_status_code); \
	}

enum sci_status scic_sds_request_start(struct scic_sds_request *sci_req);
enum sci_status scic_sds_io_request_terminate(struct scic_sds_request *sci_req);
enum sci_status
scic_sds_io_request_event_handler(struct scic_sds_request *sci_req,
				  u32 event_code);
enum sci_status
scic_sds_io_request_frame_handler(struct scic_sds_request *sci_req,
				  u32 frame_index);
enum sci_status
scic_sds_task_request_terminate(struct scic_sds_request *sci_req);
extern enum sci_status
scic_sds_request_complete(struct scic_sds_request *sci_req);
extern enum sci_status
scic_sds_io_request_tc_completion(struct scic_sds_request *sci_req, u32 code);

/* XXX open code in caller */
static inline dma_addr_t
scic_io_request_get_dma_addr(struct scic_sds_request *sci_req, void *virt_addr)
{
	struct isci_request *ireq = sci_req_to_ireq(sci_req);

	char *requested_addr = (char *)virt_addr;
	char *base_addr = (char *)ireq;

	BUG_ON(requested_addr < base_addr);
	BUG_ON((requested_addr - base_addr) >= sizeof(*ireq));

	return ireq->request_daddr + (requested_addr - base_addr);
}

/**
 * This function gets the status of the request object.
 * @request: This parameter points to the isci_request object
 *
 * status of the object as a isci_request_status enum.
 */
static inline enum isci_request_status
isci_request_get_state(struct isci_request *isci_request)
{
	BUG_ON(isci_request == NULL);

	/*probably a bad sign...	*/
	if (isci_request->status == unallocated)
		dev_warn(&isci_request->isci_host->pdev->dev,
			 "%s: isci_request->status == unallocated\n",
			 __func__);

	return isci_request->status;
}


/**
 * isci_request_change_state() - This function sets the status of the request
 *    object.
 * @request: This parameter points to the isci_request object
 * @status: This Parameter is the new status of the object
 *
 */
static inline enum isci_request_status
isci_request_change_state(struct isci_request *isci_request,
			  enum isci_request_status status)
{
	enum isci_request_status old_state;
	unsigned long flags;

	dev_dbg(&isci_request->isci_host->pdev->dev,
		"%s: isci_request = %p, state = 0x%x\n",
		__func__,
		isci_request,
		status);

	BUG_ON(isci_request == NULL);

	spin_lock_irqsave(&isci_request->state_lock, flags);
	old_state = isci_request->status;
	isci_request->status = status;
	spin_unlock_irqrestore(&isci_request->state_lock, flags);

	return old_state;
}

/**
 * isci_request_change_started_to_newstate() - This function sets the status of
 *    the request object.
 * @request: This parameter points to the isci_request object
 * @status: This Parameter is the new status of the object
 *
 * state previous to any change.
 */
static inline enum isci_request_status
isci_request_change_started_to_newstate(struct isci_request *isci_request,
					struct completion *completion_ptr,
					enum isci_request_status newstate)
{
	enum isci_request_status old_state;
	unsigned long flags;

	spin_lock_irqsave(&isci_request->state_lock, flags);

	old_state = isci_request->status;

	if (old_state == started || old_state == aborting) {
		BUG_ON(isci_request->io_request_completion != NULL);

		isci_request->io_request_completion = completion_ptr;
		isci_request->status = newstate;
	}

	spin_unlock_irqrestore(&isci_request->state_lock, flags);

	dev_dbg(&isci_request->isci_host->pdev->dev,
		"%s: isci_request = %p, old_state = 0x%x\n",
		__func__,
		isci_request,
		old_state);

	return old_state;
}

/**
 * isci_request_change_started_to_aborted() - This function sets the status of
 *    the request object.
 * @request: This parameter points to the isci_request object
 * @completion_ptr: This parameter is saved as the kernel completion structure
 *    signalled when the old request completes.
 *
 * state previous to any change.
 */
static inline enum isci_request_status
isci_request_change_started_to_aborted(struct isci_request *isci_request,
				       struct completion *completion_ptr)
{
	return isci_request_change_started_to_newstate(isci_request,
						       completion_ptr,
						       aborted);
}

#define isci_request_access_task(req) ((req)->ttype_ptr.io_task_ptr)

#define isci_request_access_tmf(req) ((req)->ttype_ptr.tmf_task_ptr)

struct isci_request *isci_tmf_request_from_tag(struct isci_host *ihost,
					       struct isci_tmf *isci_tmf,
					       u16 tag);
int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *idev,
			 struct sas_task *task, u16 tag);
void isci_terminate_pending_requests(struct isci_host *ihost,
				     struct isci_remote_device *idev);
enum sci_status
scic_task_request_construct(struct scic_sds_controller *scic,
			    struct scic_sds_remote_device *sci_dev,
			    u16 io_tag,
			    struct scic_sds_request *sci_req);
enum sci_status
scic_task_request_construct_ssp(struct scic_sds_request *sci_req);
enum sci_status
scic_task_request_construct_sata(struct scic_sds_request *sci_req);
void
scic_stp_io_request_set_ncq_tag(struct scic_sds_request *sci_req, u16 ncq_tag);
void scic_sds_smp_request_copy_response(struct scic_sds_request *sci_req);

static inline int isci_task_is_ncq_recovery(struct sas_task *task)
{
	return (sas_protocol_ata(task->task_proto) &&
	        task->ata_task.fis.command == ATA_CMD_READ_LOG_EXT &&
	        task->ata_task.fis.lbal == ATA_LOG_SATA_NCQ);

}

#endif /* !defined(_ISCI_REQUEST_H_) */