summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/isci/port.h
blob: a44e541914f58b77d1f01125e9342aaf73e2a761 (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
/*
 * 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_PORT_H_
#define _ISCI_PORT_H_

#include <scsi/libsas.h>
#include "isci.h"
#include "sas.h"
#include "phy.h"

#define SCIC_SDS_DUMMY_PORT   0xFF

struct isci_phy;
struct isci_host;

enum isci_status {
	isci_freed        = 0x00,
	isci_starting     = 0x01,
	isci_ready        = 0x02,
	isci_ready_for_io = 0x03,
	isci_stopping     = 0x04,
	isci_stopped      = 0x05,
};

/**
 * struct scic_sds_port
 *
 * The core port object provides the the abstraction for an SCU port.
 */
struct scic_sds_port {
	/**
	 * This field contains the information for the base port state machine.
	 */
	struct sci_base_state_machine sm;

	bool ready_exit;

	/**
	 * This field is the port index that is reported to the SCI USER.
	 * This allows the actual hardware physical port to change without
	 * the SCI USER getting a different answer for the get port index.
	 */
	u8 logical_port_index;

	/**
	 * This field is the port index used to program the SCU hardware.
	 */
	u8 physical_port_index;

	/**
	 * This field contains the active phy mask for the port.
	 * This mask is used in conjunction with the phy state to determine
	 * which phy to select for some port operations.
	 */
	u8 active_phy_mask;

	u16 reserved_rni;
	u16 reserved_tag;

	/**
	 * This field contains the count of the io requests started on this port
	 * object.  It is used to control controller shutdown.
	 */
	u32 started_request_count;

	/**
	 * This field contains the number of devices assigned to this port.
	 * It is used to control port start requests.
	 */
	u32 assigned_device_count;

	/**
	 * This field contains the reason for the port not going ready.  It is
	 * assigned in the state handlers and used in the state transition.
	 */
	u32 not_ready_reason;

	/**
	 * This field is the table of phys assigned to the port.
	 */
	struct scic_sds_phy *phy_table[SCI_MAX_PHYS];

	/**
	 * This field is a pointer back to the controller that owns this
	 * port object.
	 */
	struct scic_sds_controller *owning_controller;

	/* timer used for port start/stop operations */
	struct sci_timer	timer;

	/**
	 * This field is the pointer to the port task scheduler registers
	 * for the SCU hardware.
	 */
	struct scu_port_task_scheduler_registers __iomem
		*port_task_scheduler_registers;

	/**
	 * This field is identical for all port objects and points to the port
	 * task scheduler group PE configuration registers.
	 * It is used to assign PEs to a port.
	 */
	u32 __iomem *port_pe_configuration_register;

	/**
	 * This field is the VIIT register space for ths port object.
	 */
	struct scu_viit_entry __iomem *viit_registers;
};



/**
 * struct isci_port - This class represents the port object used to internally
 *    represent libsas port objects. It also keeps a list of remote device
 *    objects.
 *
 *
 */
struct isci_port {
	enum isci_status status;
	#define IPORT_BCN_BLOCKED 0
	#define IPORT_BCN_PENDING 1
	unsigned long flags;
	atomic_t event;
	struct isci_host *isci_host;
	struct asd_sas_port sas_port;
	struct list_head remote_dev_list;
	spinlock_t state_lock;
	struct list_head domain_dev_list;
	struct completion start_complete;
	struct completion hard_reset_complete;
	enum sci_status hard_reset_status;
	struct scic_sds_port sci;
};

static inline struct isci_port *sci_port_to_iport(struct scic_sds_port *sci_port)
{
	struct isci_port *iport = container_of(sci_port, typeof(*iport), sci);

	return iport;
}

enum scic_port_not_ready_reason_code {
	SCIC_PORT_NOT_READY_NO_ACTIVE_PHYS,
	SCIC_PORT_NOT_READY_HARD_RESET_REQUESTED,
	SCIC_PORT_NOT_READY_INVALID_PORT_CONFIGURATION,
	SCIC_PORT_NOT_READY_RECONFIGURING,

	SCIC_PORT_NOT_READY_REASON_CODE_MAX
};

struct scic_port_end_point_properties {
	struct sci_sas_address sas_address;
	struct scic_phy_proto protocols;
};

struct scic_port_properties {
	u32 index;
	struct scic_port_end_point_properties local;
	struct scic_port_end_point_properties remote;
	u32 phy_mask;
};

/**
 * enum scic_sds_port_states - This enumeration depicts all the states for the
 *    common port state machine.
 *
 *
 */
enum scic_sds_port_states {
	/**
	 * This state indicates that the port has successfully been stopped.
	 * In this state no new IO operations are permitted.
	 * This state is entered from the STOPPING state.
	 */
	SCI_PORT_STOPPED,

	/**
	 * This state indicates that the port 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.
	 */
	SCI_PORT_STOPPING,

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

	/**
	 * The substate where the port is started and ready but has no
	 * active phys.
	 */
	SCI_PORT_SUB_WAITING,

	/**
	 * The substate where the port is started and ready and there is
	 * at least one phy operational.
	 */
	SCI_PORT_SUB_OPERATIONAL,

	/**
	 * The substate where the port is started and there was an
	 * add/remove phy event.  This state is only used in Automatic
	 * Port Configuration Mode (APC)
	 */
	SCI_PORT_SUB_CONFIGURING,

	/**
	 * This state indicates the port is in the process of performing a hard
	 * reset.  Thus, the user is unable to perform IO operations on this
	 * port.
	 * This state is entered from the READY state.
	 */
	SCI_PORT_RESETTING,

	/**
	 * This state indicates the port has failed a reset request.  This state
	 * is entered when a port reset request times out.
	 * This state is entered from the RESETTING state.
	 */
	SCI_PORT_FAILED,


};

/**
 * scic_sds_port_get_controller() -
 *
 * Helper macro to get the owning controller of this port
 */
#define scic_sds_port_get_controller(this_port)	\
	((this_port)->owning_controller)

/**
 * scic_sds_port_get_index() -
 *
 * This macro returns the physical port index for this port object
 */
#define scic_sds_port_get_index(this_port) \
	((this_port)->physical_port_index)


static inline void scic_sds_port_decrement_request_count(struct scic_sds_port *sci_port)
{
	if (WARN_ONCE(sci_port->started_request_count == 0,
		       "%s: tried to decrement started_request_count past 0!?",
			__func__))
		/* pass */;
	else
		sci_port->started_request_count--;
}

#define scic_sds_port_active_phy(port, phy) \
	(((port)->active_phy_mask & (1 << (phy)->phy_index)) != 0)

void scic_sds_port_construct(
	struct scic_sds_port *sci_port,
	u8 port_index,
	struct scic_sds_controller *scic);

enum sci_status scic_sds_port_initialize(
	struct scic_sds_port *sci_port,
	void __iomem *port_task_scheduler_registers,
	void __iomem *port_configuration_regsiter,
	void __iomem *viit_registers);

enum sci_status scic_sds_port_start(struct scic_sds_port *sci_port);
enum sci_status scic_sds_port_stop(struct scic_sds_port *sci_port);

enum sci_status scic_sds_port_add_phy(
	struct scic_sds_port *sci_port,
	struct scic_sds_phy *sci_phy);

enum sci_status scic_sds_port_remove_phy(
	struct scic_sds_port *sci_port,
	struct scic_sds_phy *sci_phy);

void scic_sds_port_setup_transports(
	struct scic_sds_port *sci_port,
	u32 device_id);

void isci_port_bcn_enable(struct isci_host *, struct isci_port *);

void scic_sds_port_deactivate_phy(
	struct scic_sds_port *sci_port,
	struct scic_sds_phy *sci_phy,
	bool do_notify_user);

bool scic_sds_port_link_detected(
	struct scic_sds_port *sci_port,
	struct scic_sds_phy *sci_phy);

enum sci_status scic_sds_port_link_up(struct scic_sds_port *sci_port,
				      struct scic_sds_phy *sci_phy);
enum sci_status scic_sds_port_link_down(struct scic_sds_port *sci_port,
					struct scic_sds_phy *sci_phy);

struct scic_sds_request;
struct scic_sds_remote_device;
enum sci_status scic_sds_port_start_io(
	struct scic_sds_port *sci_port,
	struct scic_sds_remote_device *sci_dev,
	struct scic_sds_request *sci_req);

enum sci_status scic_sds_port_complete_io(
	struct scic_sds_port *sci_port,
	struct scic_sds_remote_device *sci_dev,
	struct scic_sds_request *sci_req);

enum sas_linkrate scic_sds_port_get_max_allowed_speed(
	struct scic_sds_port *sci_port);

void scic_sds_port_broadcast_change_received(
	struct scic_sds_port *sci_port,
	struct scic_sds_phy *sci_phy);

bool scic_sds_port_is_valid_phy_assignment(
	struct scic_sds_port *sci_port,
	u32 phy_index);

void scic_sds_port_get_sas_address(
	struct scic_sds_port *sci_port,
	struct sci_sas_address *sas_address);

void scic_sds_port_get_attached_sas_address(
	struct scic_sds_port *sci_port,
	struct sci_sas_address *sas_address);

enum isci_status isci_port_get_state(
	struct isci_port *isci_port);

void isci_port_formed(struct asd_sas_phy *);
void isci_port_deformed(struct asd_sas_phy *);

void isci_port_init(
	struct isci_port *port,
	struct isci_host *host,
	int index);

int isci_port_perform_hard_reset(struct isci_host *ihost, struct isci_port *iport,
				 struct isci_phy *iphy);
#endif /* !defined(_ISCI_PORT_H_) */