summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/isci/task.h
blob: bc78c0a41d5cac86df69d6a23af08e6dac949552 (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
/*
 * 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_TASK_H_
#define _ISCI_TASK_H_

#include <scsi/sas_ata.h>
#include "host.h"

#define ISCI_TERMINATION_TIMEOUT_MSEC 500

struct isci_request;

/**
 * enum isci_tmf_cb_state - This enum defines the possible states in which the
 *    TMF callback function is invoked during the TMF execution process.
 *
 *
 */
enum isci_tmf_cb_state {

	isci_tmf_init_state = 0,
	isci_tmf_started,
	isci_tmf_timed_out
};

/**
 * enum isci_tmf_function_codes - This enum defines the possible preparations
 *    of task management requests.
 *
 *
 */
enum isci_tmf_function_codes {

	isci_tmf_func_none      = 0,
	isci_tmf_ssp_task_abort = TMF_ABORT_TASK,
	isci_tmf_ssp_lun_reset  = TMF_LU_RESET,
	isci_tmf_sata_srst_high = TMF_LU_RESET + 0x100, /* Non SCSI */
	isci_tmf_sata_srst_low  = TMF_LU_RESET + 0x101  /* Non SCSI */
};
/**
 * struct isci_tmf - This class represents the task management object which
 *    acts as an interface to libsas for processing task management requests
 *
 *
 */
struct isci_tmf {

	struct completion *complete;
	enum sas_protocol proto;
	union {
		struct ssp_response_iu resp_iu;
		struct dev_to_host_fis d2h_fis;
		u8 rsp_buf[SSP_RESP_IU_MAX_SIZE];
	} resp;
	unsigned char lun[8];
	u16 io_tag;
	struct isci_remote_device *device;
	enum isci_tmf_function_codes tmf_code;
	int status;

	/* The optional callback function allows the user process to
	 * track the TMF transmit / timeout conditions.
	 */
	void (*cb_state_func)(
		enum isci_tmf_cb_state,
		struct isci_tmf *, void *);
	void *cb_data;

};

static inline void isci_print_tmf(struct isci_tmf *tmf)
{
	if (SAS_PROTOCOL_SATA == tmf->proto)
		dev_dbg(&tmf->device->isci_port->isci_host->pdev->dev,
			"%s: status = %x\n"
			"tmf->resp.d2h_fis.status = %x\n"
			"tmf->resp.d2h_fis.error = %x\n",
			__func__,
			tmf->status,
			tmf->resp.d2h_fis.status,
			tmf->resp.d2h_fis.error);
	else
		dev_dbg(&tmf->device->isci_port->isci_host->pdev->dev,
			"%s: status = %x\n"
			"tmf->resp.resp_iu.data_present = %x\n"
			"tmf->resp.resp_iu.status = %x\n"
			"tmf->resp.resp_iu.data_length = %x\n"
			"tmf->resp.resp_iu.data[0] = %x\n"
			"tmf->resp.resp_iu.data[1] = %x\n"
			"tmf->resp.resp_iu.data[2] = %x\n"
			"tmf->resp.resp_iu.data[3] = %x\n",
			__func__,
			tmf->status,
			tmf->resp.resp_iu.datapres,
			tmf->resp.resp_iu.status,
			be32_to_cpu(tmf->resp.resp_iu.response_data_len),
			tmf->resp.resp_iu.resp_data[0],
			tmf->resp.resp_iu.resp_data[1],
			tmf->resp.resp_iu.resp_data[2],
			tmf->resp.resp_iu.resp_data[3]);
}


int isci_task_execute_task(
	struct sas_task *task,
	int num,
	gfp_t gfp_flags);

int isci_task_abort_task(
	struct sas_task *task);

int isci_task_abort_task_set(
	struct domain_device *d_device,
	u8 *lun);

int isci_task_clear_aca(
	struct domain_device *d_device,
	u8 *lun);

int isci_task_clear_task_set(
	struct domain_device *d_device,
	u8 *lun);

int isci_task_query_task(
	struct sas_task *task);

int isci_task_lu_reset(
	struct domain_device *d_device,
	u8 *lun);

int isci_task_clear_nexus_port(
	struct asd_sas_port *port);

int isci_task_clear_nexus_ha(
	struct sas_ha_struct *ha);

int isci_task_I_T_nexus_reset(
	struct domain_device *d_device);

void isci_task_request_complete(
	struct isci_host *isci_host,
	struct isci_request *request,
	enum sci_task_status completion_status);

u16 isci_task_ssp_request_get_io_tag_to_manage(
	struct isci_request *request);

u8 isci_task_ssp_request_get_function(
	struct isci_request *request);


void *isci_task_ssp_request_get_response_data_address(
	struct isci_request *request);

u32 isci_task_ssp_request_get_response_data_length(
	struct isci_request *request);

int isci_queuecommand(
	struct scsi_cmnd *scsi_cmd,
	void (*donefunc)(struct scsi_cmnd *));

int isci_bus_reset_handler(struct scsi_cmnd *cmd);

/**
 * enum isci_completion_selection - This enum defines the possible actions to
 *    take with respect to a given request's notification back to libsas.
 *
 *
 */
enum isci_completion_selection {

	isci_perform_normal_io_completion,      /* Normal notify (task_done) */
	isci_perform_aborted_io_completion,     /* No notification.   */
	isci_perform_error_io_completion        /* Use sas_task_abort */
};

/**
 * isci_task_set_completion_status() - This function sets the completion status
 *    for the request.
 * @task: This parameter is the completed request.
 * @response: This parameter is the response code for the completed task.
 * @status: This parameter is the status code for the completed task.
 *
* @return The new notification mode for the request.
*/
static inline enum isci_completion_selection
isci_task_set_completion_status(
	struct sas_task *task,
	enum service_response response,
	enum exec_status status,
	enum isci_completion_selection task_notification_selection)
{
	unsigned long flags;

	spin_lock_irqsave(&task->task_state_lock, flags);

	/* If a device reset is being indicated, make sure the I/O
	* is in the error path.
	*/
	if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET) {
		/* Fail the I/O to make sure it goes into the error path. */
		response = SAS_TASK_UNDELIVERED;
		status = SAM_STAT_TASK_ABORTED;

		task_notification_selection = isci_perform_error_io_completion;
	}
	task->task_status.resp = response;
	task->task_status.stat = status;

	switch (task->task_proto) {

	case SAS_PROTOCOL_SATA:
	case SAS_PROTOCOL_STP:
	case SAS_PROTOCOL_SATA | SAS_PROTOCOL_STP:

		if (task_notification_selection
		    == isci_perform_error_io_completion) {
			/* SATA/STP I/O has it's own means of scheduling device
			* error handling on the normal path.
			*/
			task_notification_selection
				= isci_perform_normal_io_completion;
		}
		break;
	default:
		break;
	}

	switch (task_notification_selection) {

	case isci_perform_error_io_completion:

		if (task->task_proto == SAS_PROTOCOL_SMP) {
			/* There is no error escalation in the SMP case.
			 * Convert to a normal completion to avoid the
			 * timeout in the discovery path and to let the
			 * next action take place quickly.
			 */
			task_notification_selection
				= isci_perform_normal_io_completion;

			/* Fall through to the normal case... */
		} else {
			/* Use sas_task_abort */
			/* Leave SAS_TASK_STATE_DONE clear
			 * Leave SAS_TASK_AT_INITIATOR set.
			 */
			break;
		}

	case isci_perform_aborted_io_completion:
		/* This path can occur with task-managed requests as well as
		 * requests terminated because of LUN or device resets.
		 */
		/* Fall through to the normal case... */
	case isci_perform_normal_io_completion:
		/* Normal notification (task_done) */
		task->task_state_flags |= SAS_TASK_STATE_DONE;
		task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
					    SAS_TASK_STATE_PENDING);
		break;
	default:
		WARN_ONCE(1, "unknown task_notification_selection: %d\n",
			 task_notification_selection);
		break;
	}

	spin_unlock_irqrestore(&task->task_state_lock, flags);

	return task_notification_selection;

}
/**
* isci_execpath_callback() - This function is called from the task
* execute path when the task needs to callback libsas about the submit-time
* task failure.  The callback occurs either through the task's done function
* or through sas_task_abort.  In the case of regular non-discovery SATA/STP I/O
* requests, libsas takes the host lock before calling execute task.  Therefore
* in this situation the host lock must be managed before calling the func.
*
* @ihost: This parameter is the controller to which the I/O request was sent.
* @task: This parameter is the I/O request.
* @func: This parameter is the function to call in the correct context.
* @status: This parameter is the status code for the completed task.
*
*/
static inline void isci_execpath_callback(struct isci_host *ihost,
					  struct sas_task  *task,
					  void (*func)(struct sas_task *))
{
	struct domain_device *dev = task->dev;

	if (dev_is_sata(dev) && task->uldd_task) {
		unsigned long flags;

		/* Since we are still in the submit path, and since
		 * libsas takes the host lock on behalf of SATA
		 * devices before I/O starts (in the non-discovery case),
		 * we need to unlock before we can call the callback function.
		 */
		raw_local_irq_save(flags);
		spin_unlock(dev->sata_dev.ap->lock);
		func(task);
		spin_lock(dev->sata_dev.ap->lock);
		raw_local_irq_restore(flags);
	} else
		func(task);
}
#endif /* !defined(_SCI_TASK_H_) */
OpenPOWER on IntegriCloud