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58 #include <scsi/sas_ata.h>
64 * enum isci_tmf_cb_state - This enum defines the possible states in which the
65 * TMF callback function is invoked during the TMF execution process.
69 enum isci_tmf_cb_state
{
71 isci_tmf_init_state
= 0,
77 * enum isci_tmf_function_codes - This enum defines the possible preparations
78 * of task management requests.
82 enum isci_tmf_function_codes
{
84 isci_tmf_func_none
= 0,
85 isci_tmf_ssp_task_abort
= TMF_ABORT_TASK
,
86 isci_tmf_ssp_lun_reset
= TMF_LU_RESET
,
87 isci_tmf_sata_srst_high
= TMF_LU_RESET
+ 0x100, /* Non SCSI */
88 isci_tmf_sata_srst_low
= TMF_LU_RESET
+ 0x101 /* Non SCSI */
91 * struct isci_tmf - This class represents the task management object which
92 * acts as an interface to libsas for processing task management requests
98 struct completion
*complete
;
99 enum sas_protocol proto
;
101 struct ssp_response_iu resp_iu
;
102 struct dev_to_host_fis d2h_fis
;
103 u8 rsp_buf
[SSP_RESP_IU_MAX_SIZE
];
105 unsigned char lun
[8];
107 struct isci_remote_device
*device
;
108 enum isci_tmf_function_codes tmf_code
;
111 /* The optional callback function allows the user process to
112 * track the TMF transmit / timeout conditions.
114 void (*cb_state_func
)(
115 enum isci_tmf_cb_state
,
116 struct isci_tmf
*, void *);
121 static inline void isci_print_tmf(struct isci_tmf
*tmf
)
123 if (SAS_PROTOCOL_SATA
== tmf
->proto
)
124 dev_dbg(&tmf
->device
->isci_port
->isci_host
->pdev
->dev
,
126 "tmf->resp.d2h_fis.status = %x\n"
127 "tmf->resp.d2h_fis.error = %x\n",
130 tmf
->resp
.d2h_fis
.status
,
131 tmf
->resp
.d2h_fis
.error
);
133 dev_dbg(&tmf
->device
->isci_port
->isci_host
->pdev
->dev
,
135 "tmf->resp.resp_iu.data_present = %x\n"
136 "tmf->resp.resp_iu.status = %x\n"
137 "tmf->resp.resp_iu.data_length = %x\n"
138 "tmf->resp.resp_iu.data[0] = %x\n"
139 "tmf->resp.resp_iu.data[1] = %x\n"
140 "tmf->resp.resp_iu.data[2] = %x\n"
141 "tmf->resp.resp_iu.data[3] = %x\n",
144 tmf
->resp
.resp_iu
.datapres
,
145 tmf
->resp
.resp_iu
.status
,
146 be32_to_cpu(tmf
->resp
.resp_iu
.response_data_len
),
147 tmf
->resp
.resp_iu
.resp_data
[0],
148 tmf
->resp
.resp_iu
.resp_data
[1],
149 tmf
->resp
.resp_iu
.resp_data
[2],
150 tmf
->resp
.resp_iu
.resp_data
[3]);
154 int isci_task_execute_task(
155 struct sas_task
*task
,
159 int isci_task_abort_task(
160 struct sas_task
*task
);
162 int isci_task_abort_task_set(
163 struct domain_device
*d_device
,
166 int isci_task_clear_aca(
167 struct domain_device
*d_device
,
170 int isci_task_clear_task_set(
171 struct domain_device
*d_device
,
174 int isci_task_query_task(
175 struct sas_task
*task
);
177 int isci_task_lu_reset(
178 struct domain_device
*d_device
,
181 int isci_task_clear_nexus_port(
182 struct asd_sas_port
*port
);
184 int isci_task_clear_nexus_ha(
185 struct sas_ha_struct
*ha
);
187 int isci_task_I_T_nexus_reset(
188 struct domain_device
*d_device
);
190 void isci_task_request_complete(
191 struct isci_host
*isci_host
,
192 struct isci_request
*request
,
193 enum sci_task_status completion_status
);
195 u16
isci_task_ssp_request_get_io_tag_to_manage(
196 struct isci_request
*request
);
198 u8
isci_task_ssp_request_get_function(
199 struct isci_request
*request
);
202 void *isci_task_ssp_request_get_response_data_address(
203 struct isci_request
*request
);
205 u32
isci_task_ssp_request_get_response_data_length(
206 struct isci_request
*request
);
208 int isci_queuecommand(
209 struct scsi_cmnd
*scsi_cmd
,
210 void (*donefunc
)(struct scsi_cmnd
*));
212 int isci_bus_reset_handler(struct scsi_cmnd
*cmd
);
215 * enum isci_completion_selection - This enum defines the possible actions to
216 * take with respect to a given request's notification back to libsas.
220 enum isci_completion_selection
{
222 isci_perform_normal_io_completion
, /* Normal notify (task_done) */
223 isci_perform_aborted_io_completion
, /* No notification. */
224 isci_perform_error_io_completion
/* Use sas_task_abort */
227 static inline void isci_set_task_doneflags(
228 struct sas_task
*task
)
230 /* Since no futher action will be taken on this task,
231 * make sure to mark it complete from the lldd perspective.
233 task
->task_state_flags
|= SAS_TASK_STATE_DONE
;
234 task
->task_state_flags
&= ~SAS_TASK_AT_INITIATOR
;
235 task
->task_state_flags
&= ~SAS_TASK_STATE_PENDING
;
238 * isci_task_all_done() - This function clears the task bits to indicate the
239 * LLDD is done with the task.
243 static inline void isci_task_all_done(
244 struct sas_task
*task
)
248 /* Since no futher action will be taken on this task,
249 * make sure to mark it complete from the lldd perspective.
251 spin_lock_irqsave(&task
->task_state_lock
, flags
);
252 isci_set_task_doneflags(task
);
253 spin_unlock_irqrestore(&task
->task_state_lock
, flags
);
257 * isci_task_set_completion_status() - This function sets the completion status
259 * @task: This parameter is the completed request.
260 * @response: This parameter is the response code for the completed task.
261 * @status: This parameter is the status code for the completed task.
263 * @return The new notification mode for the request.
265 static inline enum isci_completion_selection
266 isci_task_set_completion_status(
267 struct sas_task
*task
,
268 enum service_response response
,
269 enum exec_status status
,
270 enum isci_completion_selection task_notification_selection
)
274 spin_lock_irqsave(&task
->task_state_lock
, flags
);
276 /* If a device reset is being indicated, make sure the I/O
277 * is in the error path.
279 if (task
->task_state_flags
& SAS_TASK_NEED_DEV_RESET
) {
280 /* Fail the I/O to make sure it goes into the error path. */
281 response
= SAS_TASK_UNDELIVERED
;
282 status
= SAM_STAT_TASK_ABORTED
;
284 task_notification_selection
= isci_perform_error_io_completion
;
286 task
->task_status
.resp
= response
;
287 task
->task_status
.stat
= status
;
289 switch (task
->task_proto
) {
291 case SAS_PROTOCOL_SATA
:
292 case SAS_PROTOCOL_STP
:
293 case SAS_PROTOCOL_SATA
| SAS_PROTOCOL_STP
:
295 if (task_notification_selection
296 == isci_perform_error_io_completion
) {
297 /* SATA/STP I/O has it's own means of scheduling device
298 * error handling on the normal path.
300 task_notification_selection
301 = isci_perform_normal_io_completion
;
308 switch (task_notification_selection
) {
310 case isci_perform_error_io_completion
:
312 if (task
->task_proto
== SAS_PROTOCOL_SMP
) {
313 /* There is no error escalation in the SMP case.
314 * Convert to a normal completion to avoid the
315 * timeout in the discovery path and to let the
316 * next action take place quickly.
318 task_notification_selection
319 = isci_perform_normal_io_completion
;
321 /* Fall through to the normal case... */
323 /* Use sas_task_abort */
324 /* Leave SAS_TASK_STATE_DONE clear
325 * Leave SAS_TASK_AT_INITIATOR set.
330 case isci_perform_aborted_io_completion
:
331 /* This path can occur with task-managed requests as well as
332 * requests terminated because of LUN or device resets.
334 /* Fall through to the normal case... */
335 case isci_perform_normal_io_completion
:
336 /* Normal notification (task_done) */
337 isci_set_task_doneflags(task
);
340 WARN_ONCE(1, "unknown task_notification_selection: %d\n",
341 task_notification_selection
);
345 spin_unlock_irqrestore(&task
->task_state_lock
, flags
);
347 return task_notification_selection
;
351 * isci_execpath_callback() - This function is called from the task
352 * execute path when the task needs to callback libsas about the submit-time
353 * task failure. The callback occurs either through the task's done function
354 * or through sas_task_abort. In the case of regular non-discovery SATA/STP I/O
355 * requests, libsas takes the host lock before calling execute task. Therefore
356 * in this situation the host lock must be managed before calling the func.
358 * @ihost: This parameter is the controller to which the I/O request was sent.
359 * @task: This parameter is the I/O request.
360 * @func: This parameter is the function to call in the correct context.
361 * @status: This parameter is the status code for the completed task.
364 static inline void isci_execpath_callback(struct isci_host
*ihost
,
365 struct sas_task
*task
,
366 void (*func
)(struct sas_task
*))
368 struct domain_device
*dev
= task
->dev
;
370 if (dev_is_sata(dev
) && task
->uldd_task
) {
373 /* Since we are still in the submit path, and since
374 * libsas takes the host lock on behalf of SATA
375 * devices before I/O starts (in the non-discovery case),
376 * we need to unlock before we can call the callback function.
378 raw_local_irq_save(flags
);
379 spin_unlock(dev
->sata_dev
.ap
->lock
);
381 spin_lock(dev
->sata_dev
.ap
->lock
);
382 raw_local_irq_restore(flags
);
386 #endif /* !defined(_SCI_TASK_H_) */