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56 #ifndef _ISCI_REMOTE_DEVICE_H_
57 #define _ISCI_REMOTE_DEVICE_H_
58 #include <scsi/libsas.h>
59 #include <linux/kref.h>
60 #include "scu_remote_node_context.h"
61 #include "remote_node_context.h"
64 enum sci_remote_device_not_ready_reason_code {
65 SCIC_REMOTE_DEVICE_NOT_READY_START_REQUESTED,
66 SCIC_REMOTE_DEVICE_NOT_READY_STOP_REQUESTED,
67 SCIC_REMOTE_DEVICE_NOT_READY_SATA_REQUEST_STARTED,
68 SCIC_REMOTE_DEVICE_NOT_READY_SATA_SDB_ERROR_FIS_RECEIVED,
69 SCIC_REMOTE_DEVICE_NOT_READY_SMP_REQUEST_STARTED,
70 SCIC_REMOTE_DEVICE_NOT_READY_REASON_CODE_MAX
74 * isci_remote_device - isci representation of a sas expander / end point
75 * @device_port_width: hw setting for number of simultaneous connections
76 * @connection_rate: per-taskcontext connection rate for this device
77 * @working_request: SATA requests have no tag we for unaccelerated
78 * protocols we need a method to associate unsolicited
79 * frames with a pending request
81 struct isci_remote_device {
82 #define IDEV_START_PENDING 0
83 #define IDEV_STOP_PENDING 1
84 #define IDEV_ALLOCATED 2
86 #define IDEV_IO_READY 4
87 #define IDEV_IO_NCQERROR 5
88 #define IDEV_RNC_LLHANG_ENABLED 6
89 #define IDEV_ABORT_PATH_ACTIVE 7
90 #define IDEV_ABORT_PATH_RESUME_PENDING 8
93 struct isci_port *isci_port;
94 struct domain_device *domain_dev;
95 struct list_head node;
96 struct sci_base_state_machine sm;
97 u32 device_port_width;
98 enum sas_linkrate connection_rate;
99 struct isci_port *owning_port;
100 struct sci_remote_node_context rnc;
101 /* XXX unify with device reference counting and delete */
102 u32 started_request_count;
103 struct isci_request *working_request;
104 u32 not_ready_reason;
105 scics_sds_remote_node_context_callback abort_resume_cb;
106 void *abort_resume_cbparam;
109 #define ISCI_REMOTE_DEVICE_START_TIMEOUT 5000
111 /* device reference routines must be called under sci_lock */
112 static inline struct isci_remote_device *isci_get_device(
113 struct isci_remote_device *idev)
116 kref_get(&idev->kref);
120 static inline struct isci_remote_device *isci_lookup_device(struct domain_device *dev)
122 struct isci_remote_device *idev = dev->lldd_dev;
124 if (idev && !test_bit(IDEV_GONE, &idev->flags)) {
125 kref_get(&idev->kref);
132 void isci_remote_device_release(struct kref *kref);
133 static inline void isci_put_device(struct isci_remote_device *idev)
136 kref_put(&idev->kref, isci_remote_device_release);
139 enum sci_status isci_remote_device_stop(struct isci_host *ihost,
140 struct isci_remote_device *idev);
141 void isci_remote_device_nuke_requests(struct isci_host *ihost,
142 struct isci_remote_device *idev);
143 void isci_remote_device_gone(struct domain_device *domain_dev);
144 int isci_remote_device_found(struct domain_device *domain_dev);
147 * sci_remote_device_stop() - This method will stop both transmission and
148 * reception of link activity for the supplied remote device. This method
149 * disables normal IO requests from flowing through to the remote device.
150 * @remote_device: This parameter specifies the device to be stopped.
151 * @timeout: This parameter specifies the number of milliseconds in which the
152 * stop operation should complete.
154 * An indication of whether the device was successfully stopped. SCI_SUCCESS
155 * This value is returned if the transmission and reception for the device was
156 * successfully stopped.
158 enum sci_status sci_remote_device_stop(
159 struct isci_remote_device *idev,
163 * sci_remote_device_reset() - This method will reset the device making it
164 * ready for operation. This method must be called anytime the device is
165 * reset either through a SMP phy control or a port hard reset request.
166 * @remote_device: This parameter specifies the device to be reset.
168 * This method does not actually cause the device hardware to be reset. This
169 * method resets the software object so that it will be operational after a
170 * device hardware reset completes. An indication of whether the device reset
171 * was accepted. SCI_SUCCESS This value is returned if the device reset is
174 enum sci_status sci_remote_device_reset(
175 struct isci_remote_device *idev);
178 * sci_remote_device_reset_complete() - This method informs the device object
179 * that the reset operation is complete and the device can resume operation
181 * @remote_device: This parameter specifies the device which is to be informed
182 * of the reset complete operation.
184 * An indication that the device is resuming operation. SCI_SUCCESS the device
185 * is resuming operation.
187 enum sci_status sci_remote_device_reset_complete(
188 struct isci_remote_device *idev);
191 * enum sci_remote_device_states - This enumeration depicts all the states
192 * for the common remote device state machine.
193 * @SCI_DEV_INITIAL: Simply the initial state for the base remote device
196 * @SCI_DEV_STOPPED: This state indicates that the remote device has
197 * successfully been stopped. In this state no new IO operations are
198 * permitted. This state is entered from the INITIAL state. This state
199 * is entered from the STOPPING state.
201 * @SCI_DEV_STARTING: This state indicates the the remote device is in
202 * the process of becoming ready (i.e. starting). In this state no new
203 * IO operations are permitted. This state is entered from the STOPPED
206 * @SCI_DEV_READY: This state indicates the remote device is now ready.
207 * Thus, the user is able to perform IO operations on the remote device.
208 * This state is entered from the STARTING state.
210 * @SCI_STP_DEV_IDLE: This is the idle substate for the stp remote
211 * device. When there are no active IO for the device it is is in this
214 * @SCI_STP_DEV_CMD: This is the command state for for the STP remote
215 * device. This state is entered when the device is processing a
216 * non-NCQ command. The device object will fail any new start IO
217 * requests until this command is complete.
219 * @SCI_STP_DEV_NCQ: This is the NCQ state for the STP remote device.
220 * This state is entered when the device is processing an NCQ reuqest.
221 * It will remain in this state so long as there is one or more NCQ
222 * requests being processed.
224 * @SCI_STP_DEV_NCQ_ERROR: This is the NCQ error state for the STP
225 * remote device. This state is entered when an SDB error FIS is
226 * received by the device object while in the NCQ state. The device
227 * object will only accept a READ LOG command while in this state.
229 * @SCI_STP_DEV_ATAPI_ERROR: This is the ATAPI error state for the STP
230 * ATAPI remote device. This state is entered when ATAPI device sends
231 * error status FIS without data while the device object is in CMD
232 * state. A suspension event is expected in this state. The device
233 * object will resume right away.
235 * @SCI_STP_DEV_AWAIT_RESET: This is the READY substate indicates the
236 * device is waiting for the RESET task coming to be recovered from
237 * certain hardware specific error.
239 * @SCI_SMP_DEV_IDLE: This is the ready operational substate for the
240 * remote device. This is the normal operational state for a remote
243 * @SCI_SMP_DEV_CMD: This is the suspended state for the remote device.
244 * This is the state that the device is placed in when a RNC suspend is
245 * received by the SCU hardware.
247 * @SCI_DEV_STOPPING: This state indicates that the remote device is in
248 * the process of stopping. In this state no new IO operations are
249 * permitted, but existing IO operations are allowed to complete. This
250 * state is entered from the READY state. This state is entered from
253 * @SCI_DEV_FAILED: This state indicates that the remote device has
254 * failed. In this state no new IO operations are permitted. This
255 * state is entered from the INITIALIZING state. This state is entered
256 * from the READY state.
258 * @SCI_DEV_RESETTING: This state indicates the device is being reset.
259 * In this state no new IO operations are permitted. This state is
260 * entered from the READY state.
262 * @SCI_DEV_FINAL: Simply the final state for the base remote device
265 #define REMOTE_DEV_STATES {\
273 C(STP_DEV_NCQ_ERROR),\
274 C(STP_DEV_ATAPI_ERROR),\
275 C(STP_DEV_AWAIT_RESET),\
285 enum sci_remote_device_states REMOTE_DEV_STATES;
287 const char *dev_state_name(enum sci_remote_device_states state);
289 static inline struct isci_remote_device *rnc_to_dev(struct sci_remote_node_context *rnc)
291 struct isci_remote_device *idev;
293 idev = container_of(rnc, typeof(*idev), rnc);
298 static inline bool dev_is_expander(struct domain_device *dev)
300 return dev->dev_type == SAS_EDGE_EXPANDER_DEVICE || dev->dev_type == SAS_FANOUT_EXPANDER_DEVICE;
303 static inline void sci_remote_device_decrement_request_count(struct isci_remote_device *idev)
305 /* XXX delete this voodoo when converting to the top-level device
308 if (WARN_ONCE(idev->started_request_count == 0,
309 "%s: tried to decrement started_request_count past 0!?",
313 idev->started_request_count--;
316 void isci_dev_set_hang_detection_timeout(struct isci_remote_device *idev, u32 timeout);
318 enum sci_status sci_remote_device_frame_handler(
319 struct isci_remote_device *idev,
322 enum sci_status sci_remote_device_event_handler(
323 struct isci_remote_device *idev,
326 enum sci_status sci_remote_device_start_io(
327 struct isci_host *ihost,
328 struct isci_remote_device *idev,
329 struct isci_request *ireq);
331 enum sci_status sci_remote_device_start_task(
332 struct isci_host *ihost,
333 struct isci_remote_device *idev,
334 struct isci_request *ireq);
336 enum sci_status sci_remote_device_complete_io(
337 struct isci_host *ihost,
338 struct isci_remote_device *idev,
339 struct isci_request *ireq);
341 void sci_remote_device_post_request(
342 struct isci_remote_device *idev,
345 enum sci_status sci_remote_device_terminate_requests(
346 struct isci_remote_device *idev);
348 int isci_remote_device_is_safe_to_abort(
349 struct isci_remote_device *idev);
352 sci_remote_device_abort_requests_pending_abort(
353 struct isci_remote_device *idev);
355 enum sci_status isci_remote_device_suspend(
356 struct isci_host *ihost,
357 struct isci_remote_device *idev);
359 enum sci_status sci_remote_device_resume(
360 struct isci_remote_device *idev,
361 scics_sds_remote_node_context_callback cb_fn,
364 enum sci_status isci_remote_device_resume_from_abort(
365 struct isci_host *ihost,
366 struct isci_remote_device *idev);
368 enum sci_status isci_remote_device_reset(
369 struct isci_host *ihost,
370 struct isci_remote_device *idev);
372 enum sci_status isci_remote_device_reset_complete(
373 struct isci_host *ihost,
374 struct isci_remote_device *idev);
376 enum sci_status isci_remote_device_suspend_terminate(
377 struct isci_host *ihost,
378 struct isci_remote_device *idev,
379 struct isci_request *ireq);
381 enum sci_status isci_remote_device_terminate_requests(
382 struct isci_host *ihost,
383 struct isci_remote_device *idev,
384 struct isci_request *ireq);
385 enum sci_status sci_remote_device_suspend(struct isci_remote_device *idev,
386 enum sci_remote_node_suspension_reasons reason);
387 #endif /* !defined(_ISCI_REMOTE_DEVICE_H_) */