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56 #ifndef _ISCI_REQUEST_H_
57 #define _ISCI_REQUEST_H_
61 #include "scu_task_context.h"
64 * struct isci_request_status - This enum defines the possible states of an I/O
69 enum isci_request_status {
85 enum sci_request_protocol {
90 }; /* XXX remove me, use sas_task.{dev|task_proto} instead */;
93 * isci_stp_request - extra request infrastructure to handle pio/atapi protocol
94 * @pio_len - number of bytes requested at PIO setup
95 * @status - pio setup ending status value to tell us if we need
96 * to wait for another fis or if the transfer is complete. Upon
97 * receipt of a d2h fis this will be the status field of that fis.
98 * @sgl - track pio transfer progress as we iterate through the sgl
99 * @device_cdb_len - atapi device advertises it's transfer constraints at setup
101 struct isci_stp_request {
105 struct isci_stp_pio_sgl {
113 struct isci_request {
114 enum isci_request_status status;
115 #define IREQ_COMPLETE_IN_TARGET 0
116 #define IREQ_TERMINATED 1
118 #define IREQ_ACTIVE 3
120 /* XXX kill ttype and ttype_ptr, allocate full sas_task */
121 enum task_type ttype;
122 union ttype_ptr_union {
123 struct sas_task *io_task_ptr; /* When ttype==io_task */
124 struct isci_tmf *tmf_task_ptr; /* When ttype==tmf_task */
126 struct isci_host *isci_host;
127 /* For use in the requests_to_{complete|abort} lists: */
128 struct list_head completed_node;
129 /* For use in the reqs_in_process list: */
130 struct list_head dev_node;
131 spinlock_t state_lock;
132 dma_addr_t request_daddr;
133 dma_addr_t zero_scatter_daddr;
134 unsigned int num_sg_entries;
135 /* Note: "io_request_completion" is completed in two different ways
136 * depending on whether this is a TMF or regular request.
137 * - TMF requests are completed in the thread that started them;
138 * - regular requests are completed in the request completion callback
140 * This difference in operation allows the aborter of a TMF request
141 * to be sure that once the TMF request completes, the I/O that the
142 * TMF was aborting is guaranteed to have completed.
144 * XXX kill io_request_completion
146 struct completion *io_request_completion;
147 struct sci_base_state_machine sm;
148 struct scic_sds_controller *owning_controller;
149 struct isci_remote_device *target_device;
151 enum sci_request_protocol protocol;
152 u32 scu_status; /* hardware result */
153 u32 sci_status; /* upper layer disposition */
155 struct scu_task_context *tc;
156 /* could be larger with sg chaining */
157 #define SCU_SGL_SIZE ((SCI_MAX_SCATTER_GATHER_ELEMENTS + 1) / 2)
158 struct scu_sgl_element_pair sg_table[SCU_SGL_SIZE] __attribute__ ((aligned(32)));
159 /* This field is a pointer to the stored rx frame data. It is used in
160 * STP internal requests and SMP response frames. If this field is
161 * non-NULL the saved frame must be released on IO request completion.
163 u32 saved_rx_frame_index;
168 struct ssp_cmd_iu cmd;
169 struct ssp_task_iu tmf;
172 struct ssp_response_iu rsp;
173 u8 rsp_buf[SSP_RESP_IU_MAX_SIZE];
180 struct isci_stp_request req;
181 struct host_to_dev_fis cmd;
182 struct dev_to_host_fis rsp;
187 static inline struct isci_request *to_ireq(struct isci_stp_request *stp_req)
189 struct isci_request *ireq;
191 ireq = container_of(stp_req, typeof(*ireq), stp.req);
196 * enum sci_base_request_states - This enumeration depicts all the states for
197 * the common request state machine.
201 enum sci_base_request_states {
203 * Simply the initial state for the base request state machine.
208 * This state indicates that the request has been constructed.
209 * This state is entered from the INITIAL state.
214 * This state indicates that the request has been started. This state
215 * is entered from the CONSTRUCTED state.
219 SCI_REQ_STP_UDMA_WAIT_TC_COMP,
220 SCI_REQ_STP_UDMA_WAIT_D2H,
222 SCI_REQ_STP_NON_DATA_WAIT_H2D,
223 SCI_REQ_STP_NON_DATA_WAIT_D2H,
225 SCI_REQ_STP_SOFT_RESET_WAIT_H2D_ASSERTED,
226 SCI_REQ_STP_SOFT_RESET_WAIT_H2D_DIAG,
227 SCI_REQ_STP_SOFT_RESET_WAIT_D2H,
230 * While in this state the IO request object is waiting for the TC
231 * completion notification for the H2D Register FIS
233 SCI_REQ_STP_PIO_WAIT_H2D,
236 * While in this state the IO request object is waiting for either a
237 * PIO Setup FIS or a D2H register FIS. The type of frame received is
238 * based on the result of the prior frame and line conditions.
240 SCI_REQ_STP_PIO_WAIT_FRAME,
243 * While in this state the IO request object is waiting for a DATA
244 * frame from the device.
246 SCI_REQ_STP_PIO_DATA_IN,
249 * While in this state the IO request object is waiting to transmit
250 * the next data frame to the device.
252 SCI_REQ_STP_PIO_DATA_OUT,
255 * The AWAIT_TC_COMPLETION sub-state indicates that the started raw
256 * task management request is waiting for the transmission of the
257 * initial frame (i.e. command, task, etc.).
259 SCI_REQ_TASK_WAIT_TC_COMP,
262 * This sub-state indicates that the started task management request
263 * is waiting for the reception of an unsolicited frame
264 * (i.e. response IU).
266 SCI_REQ_TASK_WAIT_TC_RESP,
269 * This sub-state indicates that the started task management request
270 * is waiting for the reception of an unsolicited frame
271 * (i.e. response IU).
273 SCI_REQ_SMP_WAIT_RESP,
276 * The AWAIT_TC_COMPLETION sub-state indicates that the started SMP
277 * request is waiting for the transmission of the initial frame
278 * (i.e. command, task, etc.).
280 SCI_REQ_SMP_WAIT_TC_COMP,
283 * This state indicates that the request has completed.
284 * This state is entered from the STARTED state. This state is entered
285 * from the ABORTING state.
290 * This state indicates that the request is in the process of being
291 * terminated/aborted.
292 * This state is entered from the CONSTRUCTED state.
293 * This state is entered from the STARTED state.
298 * Simply the final state for the base request state machine.
304 * scic_sds_request_get_controller() -
306 * This macro will return the controller for this io request object
308 #define scic_sds_request_get_controller(ireq) \
309 ((ireq)->owning_controller)
312 * scic_sds_request_get_device() -
314 * This macro will return the device for this io request object
316 #define scic_sds_request_get_device(ireq) \
317 ((ireq)->target_device)
320 * scic_sds_request_get_port() -
322 * This macro will return the port for this io request object
324 #define scic_sds_request_get_port(ireq) \
325 scic_sds_remote_device_get_port(scic_sds_request_get_device(ireq))
328 * scic_sds_request_get_post_context() -
330 * This macro returns the constructed post context result for the io request.
332 #define scic_sds_request_get_post_context(ireq) \
333 ((ireq)->post_context)
336 * scic_sds_request_get_task_context() -
338 * This is a helper macro to return the os handle for this request object.
340 #define scic_sds_request_get_task_context(request) \
341 ((request)->task_context_buffer)
344 * scic_sds_request_set_status() -
346 * This macro will set the scu hardware status and sci request completion
347 * status for an io request.
349 #define scic_sds_request_set_status(request, scu_status_code, sci_status_code) \
351 (request)->scu_status = (scu_status_code); \
352 (request)->sci_status = (sci_status_code); \
355 enum sci_status scic_sds_request_start(struct isci_request *ireq);
356 enum sci_status scic_sds_io_request_terminate(struct isci_request *ireq);
358 scic_sds_io_request_event_handler(struct isci_request *ireq,
361 scic_sds_io_request_frame_handler(struct isci_request *ireq,
364 scic_sds_task_request_terminate(struct isci_request *ireq);
365 extern enum sci_status
366 scic_sds_request_complete(struct isci_request *ireq);
367 extern enum sci_status
368 scic_sds_io_request_tc_completion(struct isci_request *ireq, u32 code);
370 /* XXX open code in caller */
371 static inline dma_addr_t
372 scic_io_request_get_dma_addr(struct isci_request *ireq, void *virt_addr)
375 char *requested_addr = (char *)virt_addr;
376 char *base_addr = (char *)ireq;
378 BUG_ON(requested_addr < base_addr);
379 BUG_ON((requested_addr - base_addr) >= sizeof(*ireq));
381 return ireq->request_daddr + (requested_addr - base_addr);
385 * This function gets the status of the request object.
386 * @request: This parameter points to the isci_request object
388 * status of the object as a isci_request_status enum.
390 static inline enum isci_request_status
391 isci_request_get_state(struct isci_request *isci_request)
393 BUG_ON(isci_request == NULL);
395 /*probably a bad sign... */
396 if (isci_request->status == unallocated)
397 dev_warn(&isci_request->isci_host->pdev->dev,
398 "%s: isci_request->status == unallocated\n",
401 return isci_request->status;
406 * isci_request_change_state() - This function sets the status of the request
408 * @request: This parameter points to the isci_request object
409 * @status: This Parameter is the new status of the object
412 static inline enum isci_request_status
413 isci_request_change_state(struct isci_request *isci_request,
414 enum isci_request_status status)
416 enum isci_request_status old_state;
419 dev_dbg(&isci_request->isci_host->pdev->dev,
420 "%s: isci_request = %p, state = 0x%x\n",
425 BUG_ON(isci_request == NULL);
427 spin_lock_irqsave(&isci_request->state_lock, flags);
428 old_state = isci_request->status;
429 isci_request->status = status;
430 spin_unlock_irqrestore(&isci_request->state_lock, flags);
436 * isci_request_change_started_to_newstate() - This function sets the status of
437 * the request object.
438 * @request: This parameter points to the isci_request object
439 * @status: This Parameter is the new status of the object
441 * state previous to any change.
443 static inline enum isci_request_status
444 isci_request_change_started_to_newstate(struct isci_request *isci_request,
445 struct completion *completion_ptr,
446 enum isci_request_status newstate)
448 enum isci_request_status old_state;
451 spin_lock_irqsave(&isci_request->state_lock, flags);
453 old_state = isci_request->status;
455 if (old_state == started || old_state == aborting) {
456 BUG_ON(isci_request->io_request_completion != NULL);
458 isci_request->io_request_completion = completion_ptr;
459 isci_request->status = newstate;
462 spin_unlock_irqrestore(&isci_request->state_lock, flags);
464 dev_dbg(&isci_request->isci_host->pdev->dev,
465 "%s: isci_request = %p, old_state = 0x%x\n",
474 * isci_request_change_started_to_aborted() - This function sets the status of
475 * the request object.
476 * @request: This parameter points to the isci_request object
477 * @completion_ptr: This parameter is saved as the kernel completion structure
478 * signalled when the old request completes.
480 * state previous to any change.
482 static inline enum isci_request_status
483 isci_request_change_started_to_aborted(struct isci_request *isci_request,
484 struct completion *completion_ptr)
486 return isci_request_change_started_to_newstate(isci_request,
491 #define isci_request_access_task(req) ((req)->ttype_ptr.io_task_ptr)
493 #define isci_request_access_tmf(req) ((req)->ttype_ptr.tmf_task_ptr)
495 struct isci_request *isci_tmf_request_from_tag(struct isci_host *ihost,
496 struct isci_tmf *isci_tmf,
498 int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *idev,
499 struct sas_task *task, u16 tag);
500 void isci_terminate_pending_requests(struct isci_host *ihost,
501 struct isci_remote_device *idev);
503 scic_task_request_construct(struct scic_sds_controller *scic,
504 struct isci_remote_device *idev,
506 struct isci_request *ireq);
508 scic_task_request_construct_ssp(struct isci_request *ireq);
510 scic_task_request_construct_sata(struct isci_request *ireq);
512 scic_stp_io_request_set_ncq_tag(struct isci_request *ireq, u16 ncq_tag);
513 void scic_sds_smp_request_copy_response(struct isci_request *ireq);
515 static inline int isci_task_is_ncq_recovery(struct sas_task *task)
517 return (sas_protocol_ata(task->task_proto) &&
518 task->ata_task.fis.command == ATA_CMD_READ_LOG_EXT &&
519 task->ata_task.fis.lbal == ATA_LOG_SATA_NCQ);
523 #endif /* !defined(_ISCI_REQUEST_H_) */