summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/isci/host.h
blob: 5477f0fa8233198e691945a08c14eba074be2f21 (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
/*
 * 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 _SCI_HOST_H_
#define _SCI_HOST_H_

#include "remote_device.h"
#include "phy.h"
#include "isci.h"
#include "remote_node_table.h"
#include "registers.h"
#include "unsolicited_frame_control.h"
#include "probe_roms.h"

struct isci_request;
struct scu_task_context;


/**
 * struct sci_power_control -
 *
 * This structure defines the fields for managing power control for direct
 * attached disk devices.
 */
struct sci_power_control {
	/**
	 * This field is set when the power control timer is running and cleared when
	 * it is not.
	 */
	bool timer_started;

	/**
	 * Timer to control when the directed attached disks can consume power.
	 */
	struct sci_timer timer;

	/**
	 * This field is used to keep track of how many phys are put into the
	 * requesters field.
	 */
	u8 phys_waiting;

	/**
	 * This field is used to keep track of how many phys have been granted to consume power
	 */
	u8 phys_granted_power;

	/**
	 * This field is an array of phys that we are waiting on. The phys are direct
	 * mapped into requesters via struct sci_phy.phy_index
	 */
	struct isci_phy *requesters[SCI_MAX_PHYS];

};

struct sci_port_configuration_agent;
typedef void (*port_config_fn)(struct isci_host *,
			       struct sci_port_configuration_agent *,
			       struct isci_port *, struct isci_phy *);

struct sci_port_configuration_agent {
	u16 phy_configured_mask;
	u16 phy_ready_mask;
	struct {
		u8 min_index;
		u8 max_index;
	} phy_valid_port_range[SCI_MAX_PHYS];
	bool timer_pending;
	port_config_fn link_up_handler;
	port_config_fn link_down_handler;
	struct sci_timer	timer;
};

/**
 * isci_host - primary host/controller object
 * @timer: timeout start/stop operations
 * @device_table: rni (hw remote node index) to remote device lookup table
 * @available_remote_nodes: rni allocator
 * @power_control: manage device spin up
 * @io_request_sequence: generation number for tci's (task contexts)
 * @task_context_table: hw task context table
 * @remote_node_context_table: hw remote node context table
 * @completion_queue: hw-producer driver-consumer communication ring
 * @completion_queue_get: tracks the driver 'head' of the ring to notify hw
 * @logical_port_entries: min({driver|silicon}-supported-port-count)
 * @remote_node_entries: min({driver|silicon}-supported-node-count)
 * @task_context_entries: min({driver|silicon}-supported-task-count)
 * @phy_timer: phy startup timer
 * @invalid_phy_mask: if an invalid_link_up notification is reported a bit for
 * 		      the phy index is set so further notifications are not
 * 		      made.  Once the phy reports link up and is made part of a
 * 		      port then this bit is cleared.

 */
struct isci_host {
	struct sci_base_state_machine sm;
	/* XXX can we time this externally */
	struct sci_timer timer;
	/* XXX drop reference module params directly */
	struct sci_user_parameters user_parameters;
	/* XXX no need to be a union */
	struct sci_oem_params oem_parameters;
	struct sci_port_configuration_agent port_agent;
	struct isci_remote_device *device_table[SCI_MAX_REMOTE_DEVICES];
	struct sci_remote_node_table available_remote_nodes;
	struct sci_power_control power_control;
	u8 io_request_sequence[SCI_MAX_IO_REQUESTS];
	struct scu_task_context *task_context_table;
	dma_addr_t task_context_dma;
	union scu_remote_node_context *remote_node_context_table;
	u32 *completion_queue;
	u32 completion_queue_get;
	u32 logical_port_entries;
	u32 remote_node_entries;
	u32 task_context_entries;
	struct sci_unsolicited_frame_control uf_control;

	/* phy startup */
	struct sci_timer phy_timer;
	/* XXX kill */
	bool phy_startup_timer_pending;
	u32 next_phy_to_start;
	/* XXX convert to unsigned long and use bitops */
	u8 invalid_phy_mask;

	/* TODO attempt dynamic interrupt coalescing scheme */
	u16 interrupt_coalesce_number;
	u32 interrupt_coalesce_timeout;
	struct smu_registers __iomem *smu_registers;
	struct scu_registers __iomem *scu_registers;

	u16 tci_head;
	u16 tci_tail;
	u16 tci_pool[SCI_MAX_IO_REQUESTS];

	int id; /* unique within a given pci device */
	struct isci_phy phys[SCI_MAX_PHYS];
	struct isci_port ports[SCI_MAX_PORTS + 1]; /* includes dummy port */
	struct sas_ha_struct sas_ha;

	spinlock_t state_lock;
	struct pci_dev *pdev;
	enum isci_status status;
	#define IHOST_START_PENDING 0
	#define IHOST_STOP_PENDING 1
	unsigned long flags;
	wait_queue_head_t eventq;
	struct Scsi_Host *shost;
	struct tasklet_struct completion_tasklet;
	struct list_head requests_to_complete;
	struct list_head requests_to_errorback;
	spinlock_t scic_lock;
	struct isci_request *reqs[SCI_MAX_IO_REQUESTS];
	struct isci_remote_device devices[SCI_MAX_REMOTE_DEVICES];
};

/**
 * enum sci_controller_states - This enumeration depicts all the states
 *    for the common controller state machine.
 */
enum sci_controller_states {
	/**
	 * Simply the initial state for the base controller state machine.
	 */
	SCIC_INITIAL = 0,

	/**
	 * This state indicates that the controller is reset.  The memory for
	 * the controller is in it's initial state, but the controller requires
	 * initialization.
	 * This state is entered from the INITIAL state.
	 * This state is entered from the RESETTING state.
	 */
	SCIC_RESET,

	/**
	 * This state is typically an action state that indicates the controller
	 * is in the process of initialization.  In this state no new IO operations
	 * are permitted.
	 * This state is entered from the RESET state.
	 */
	SCIC_INITIALIZING,

	/**
	 * This state indicates that the controller has been successfully
	 * initialized.  In this state no new IO operations are permitted.
	 * This state is entered from the INITIALIZING state.
	 */
	SCIC_INITIALIZED,

	/**
	 * This state indicates the the controller is in the process of becoming
	 * ready (i.e. starting).  In this state no new IO operations are permitted.
	 * This state is entered from the INITIALIZED state.
	 */
	SCIC_STARTING,

	/**
	 * This state indicates the controller is now ready.  Thus, the user
	 * is able to perform IO operations on the controller.
	 * This state is entered from the STARTING state.
	 */
	SCIC_READY,

	/**
	 * This state is typically an action state that indicates the controller
	 * is in the process of resetting.  Thus, the user is unable to perform
	 * IO operations on the controller.  A reset is considered destructive in
	 * most cases.
	 * This state is entered from the READY state.
	 * This state is entered from the FAILED state.
	 * This state is entered from the STOPPED state.
	 */
	SCIC_RESETTING,

	/**
	 * This state indicates that the controller is in the process of stopping.
	 * In this state no new IO operations are permitted, but existing IO
	 * operations are allowed to complete.
	 * This state is entered from the READY state.
	 */
	SCIC_STOPPING,

	/**
	 * This state indicates that the controller has successfully been stopped.
	 * In this state no new IO operations are permitted.
	 * This state is entered from the STOPPING state.
	 */
	SCIC_STOPPED,

	/**
	 * This state indicates that the controller could not successfully be
	 * initialized.  In this state no new IO operations are permitted.
	 * This state is entered from the INITIALIZING state.
	 * This state is entered from the STARTING state.
	 * This state is entered from the STOPPING state.
	 * This state is entered from the RESETTING state.
	 */
	SCIC_FAILED,
};

/**
 * struct isci_pci_info - This class represents the pci function containing the
 *    controllers. Depending on PCI SKU, there could be up to 2 controllers in
 *    the PCI function.
 */
#define SCI_MAX_MSIX_INT (SCI_NUM_MSI_X_INT*SCI_MAX_CONTROLLERS)

struct isci_pci_info {
	struct msix_entry msix_entries[SCI_MAX_MSIX_INT];
	struct isci_host *hosts[SCI_MAX_CONTROLLERS];
	struct isci_orom *orom;
};

static inline struct isci_pci_info *to_pci_info(struct pci_dev *pdev)
{
	return pci_get_drvdata(pdev);
}

#define for_each_isci_host(id, ihost, pdev) \
	for (id = 0, ihost = to_pci_info(pdev)->hosts[id]; \
	     id < ARRAY_SIZE(to_pci_info(pdev)->hosts) && ihost; \
	     ihost = to_pci_info(pdev)->hosts[++id])

static inline enum isci_status isci_host_get_state(struct isci_host *isci_host)
{
	return isci_host->status;
}

static inline void isci_host_change_state(struct isci_host *isci_host,
					  enum isci_status status)
{
	unsigned long flags;

	dev_dbg(&isci_host->pdev->dev,
		"%s: isci_host = %p, state = 0x%x",
		__func__,
		isci_host,
		status);
	spin_lock_irqsave(&isci_host->state_lock, flags);
	isci_host->status = status;
	spin_unlock_irqrestore(&isci_host->state_lock, flags);

}

static inline void wait_for_start(struct isci_host *ihost)
{
	wait_event(ihost->eventq, !test_bit(IHOST_START_PENDING, &ihost->flags));
}

static inline void wait_for_stop(struct isci_host *ihost)
{
	wait_event(ihost->eventq, !test_bit(IHOST_STOP_PENDING, &ihost->flags));
}

static inline void wait_for_device_start(struct isci_host *ihost, struct isci_remote_device *idev)
{
	wait_event(ihost->eventq, !test_bit(IDEV_START_PENDING, &idev->flags));
}

static inline void wait_for_device_stop(struct isci_host *ihost, struct isci_remote_device *idev)
{
	wait_event(ihost->eventq, !test_bit(IDEV_STOP_PENDING, &idev->flags));
}

static inline struct isci_host *dev_to_ihost(struct domain_device *dev)
{
	return dev->port->ha->lldd_ha;
}

/* we always use protocol engine group zero */
#define ISCI_PEG 0

/* see sci_controller_io_tag_allocate|free for how seq and tci are built */
#define ISCI_TAG(seq, tci) (((u16) (seq)) << 12 | tci)

/* these are returned by the hardware, so sanitize them */
#define ISCI_TAG_SEQ(tag) (((tag) >> 12) & (SCI_MAX_SEQ-1))
#define ISCI_TAG_TCI(tag) ((tag) & (SCI_MAX_IO_REQUESTS-1))

/* interrupt coalescing baseline: 9 == 3 to 5us interrupt delay per command */
#define ISCI_COALESCE_BASE 9

/* expander attached sata devices require 3 rnc slots */
static inline int sci_remote_device_node_count(struct isci_remote_device *idev)
{
	struct domain_device *dev = idev->domain_dev;

	if ((dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) &&
	    !idev->is_direct_attached)
		return SCU_STP_REMOTE_NODE_COUNT;
	return SCU_SSP_REMOTE_NODE_COUNT;
}

/**
 * sci_controller_clear_invalid_phy() -
 *
 * This macro will clear the bit in the invalid phy mask for this controller
 * object.  This is used to control messages reported for invalid link up
 * notifications.
 */
#define sci_controller_clear_invalid_phy(controller, phy) \
	((controller)->invalid_phy_mask &= ~(1 << (phy)->phy_index))

static inline struct device *sciphy_to_dev(struct isci_phy *iphy)
{

	if (!iphy || !iphy->isci_port || !iphy->isci_port->isci_host)
		return NULL;

	return &iphy->isci_port->isci_host->pdev->dev;
}

static inline struct device *sciport_to_dev(struct isci_port *iport)
{

	if (!iport || !iport->isci_host)
		return NULL;

	return &iport->isci_host->pdev->dev;
}

static inline struct device *scirdev_to_dev(struct isci_remote_device *idev)
{
	if (!idev || !idev->isci_port || !idev->isci_port->isci_host)
		return NULL;

	return &idev->isci_port->isci_host->pdev->dev;
}

static inline bool is_a2(struct pci_dev *pdev)
{
	if (pdev->revision < 4)
		return true;
	return false;
}

static inline bool is_b0(struct pci_dev *pdev)
{
	if (pdev->revision == 4)
		return true;
	return false;
}

static inline bool is_c0(struct pci_dev *pdev)
{
	if (pdev->revision == 5)
		return true;
	return false;
}

static inline bool is_c1(struct pci_dev *pdev)
{
	if (pdev->revision >= 6)
		return true;
	return false;
}

enum cable_selections {
	short_cable     = 0,
	long_cable      = 1,
	medium_cable    = 2,
	undefined_cable = 3
};

#define CABLE_OVERRIDE_DISABLED (0x10000)

static inline int is_cable_select_overridden(void)
{
	return cable_selection_override < CABLE_OVERRIDE_DISABLED;
}

enum cable_selections decode_cable_selection(struct isci_host *ihost, int phy);
void validate_cable_selections(struct isci_host *ihost);
char *lookup_cable_names(enum cable_selections);

/* set hw control for 'activity', even though active enclosures seem to drive
 * the activity led on their own.  Skip setting FSENG control on 'status' due
 * to unexpected operation and 'error' due to not being a supported automatic
 * FSENG output
 */
#define SGPIO_HW_CONTROL 0x00000443

static inline int isci_gpio_count(struct isci_host *ihost)
{
	return ARRAY_SIZE(ihost->scu_registers->peg0.sgpio.output_data_select);
}

void sci_controller_post_request(struct isci_host *ihost,
				      u32 request);
void sci_controller_release_frame(struct isci_host *ihost,
				       u32 frame_index);
void sci_controller_copy_sata_response(void *response_buffer,
					    void *frame_header,
					    void *frame_buffer);
enum sci_status sci_controller_allocate_remote_node_context(struct isci_host *ihost,
								 struct isci_remote_device *idev,
								 u16 *node_id);
void sci_controller_free_remote_node_context(
	struct isci_host *ihost,
	struct isci_remote_device *idev,
	u16 node_id);

struct isci_request *sci_request_by_tag(struct isci_host *ihost,
					     u16 io_tag);

void sci_controller_power_control_queue_insert(
	struct isci_host *ihost,
	struct isci_phy *iphy);

void sci_controller_power_control_queue_remove(
	struct isci_host *ihost,
	struct isci_phy *iphy);

void sci_controller_link_up(
	struct isci_host *ihost,
	struct isci_port *iport,
	struct isci_phy *iphy);

void sci_controller_link_down(
	struct isci_host *ihost,
	struct isci_port *iport,
	struct isci_phy *iphy);

void sci_controller_remote_device_stopped(
	struct isci_host *ihost,
	struct isci_remote_device *idev);

void sci_controller_copy_task_context(
	struct isci_host *ihost,
	struct isci_request *ireq);

void sci_controller_register_setup(struct isci_host *ihost);

enum sci_status sci_controller_continue_io(struct isci_request *ireq);
int isci_host_scan_finished(struct Scsi_Host *, unsigned long);
void isci_host_scan_start(struct Scsi_Host *);
u16 isci_alloc_tag(struct isci_host *ihost);
enum sci_status isci_free_tag(struct isci_host *ihost, u16 io_tag);
void isci_tci_free(struct isci_host *ihost, u16 tci);

int isci_host_init(struct isci_host *);

void isci_host_init_controller_names(
	struct isci_host *isci_host,
	unsigned int controller_idx);

void isci_host_deinit(
	struct isci_host *);

void isci_host_port_link_up(
	struct isci_host *,
	struct isci_port *,
	struct isci_phy *);
int isci_host_dev_found(struct domain_device *);

void isci_host_remote_device_start_complete(
	struct isci_host *,
	struct isci_remote_device *,
	enum sci_status);

void sci_controller_disable_interrupts(
	struct isci_host *ihost);

enum sci_status sci_controller_start_io(
	struct isci_host *ihost,
	struct isci_remote_device *idev,
	struct isci_request *ireq);

enum sci_task_status sci_controller_start_task(
	struct isci_host *ihost,
	struct isci_remote_device *idev,
	struct isci_request *ireq);

enum sci_status sci_controller_terminate_request(
	struct isci_host *ihost,
	struct isci_remote_device *idev,
	struct isci_request *ireq);

enum sci_status sci_controller_complete_io(
	struct isci_host *ihost,
	struct isci_remote_device *idev,
	struct isci_request *ireq);

void sci_port_configuration_agent_construct(
	struct sci_port_configuration_agent *port_agent);

enum sci_status sci_port_configuration_agent_initialize(
	struct isci_host *ihost,
	struct sci_port_configuration_agent *port_agent);

int isci_gpio_write(struct sas_ha_struct *, u8 reg_type, u8 reg_index,
		    u8 reg_count, u8 *write_data);
#endif
OpenPOWER on IntegriCloud