1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * SAS host prototypes and structures header file
5 * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
13 #include <linux/timer.h>
14 #include <linux/pci.h>
16 #include <linux/libata.h>
17 #include <linux/list.h>
18 #include <scsi/scsi_device.h>
19 #include <scsi/scsi_cmnd.h>
20 #include <scsi/scsi_transport_sas.h>
21 #include <linux/scatterlist.h>
22 #include <linux/slab.h>
33 PHY_ROLE_TARGET = 0x40,
34 PHY_ROLE_INITIATOR = 0x80,
42 /* The events are mnemonically described in sas_dump.c
43 * so when updating/adding events here, please also
44 * update the other file too.
47 PORTE_BYTES_DMAED = 0U,
56 PHYE_LOSS_OF_SIGNAL = 0U,
59 PHYE_SPINUP_HOLD, /* hot plug SATA, no COMWAKE sent */
66 DISCE_DISCOVER_DOMAIN = 0U,
67 DISCE_REVALIDATE_DOMAIN,
73 /* ---------- Expander Devices ---------- */
75 #define to_dom_device(_obj) container_of(_obj, struct domain_device, dev_obj)
76 #define to_dev_attr(_attr) container_of(_attr, struct domain_dev_attribute,\
79 enum routing_attribute {
95 enum ex_phy_state phy_state;
97 enum sas_device_type attached_dev_type;
98 enum sas_linkrate linkrate;
100 u8 attached_sata_host:1;
101 u8 attached_sata_dev:1;
102 u8 attached_sata_ps:1;
104 enum sas_protocol attached_tproto;
105 enum sas_protocol attached_iproto;
107 u8 attached_sas_addr[SAS_ADDR_SIZE];
110 int phy_change_count;
111 enum routing_attribute routing_attr;
117 struct sas_port *port;
120 struct expander_device {
121 struct list_head children;
124 u16 max_route_indexes;
129 u8 conf_route_table:1;
131 u8 enclosure_logical_id[8];
133 struct ex_phy *ex_phy;
134 struct sas_port *parent_port;
136 struct mutex cmd_mutex;
139 /* ---------- SATA device ---------- */
140 #define ATA_RESP_FIS_SIZE 24
144 u8 port_no; /* port number, if this is a PM (Port) */
147 struct ata_host *ata_host;
148 struct smp_resp rps_resp ____cacheline_aligned; /* report_phy_sata_resp */
149 u8 fis[ATA_RESP_FIS_SIZE];
153 struct list_head eh_list_node; /* pending a user requested eh action */
154 struct scsi_lun reset_lun;
159 SAS_DEV_FOUND, /* device notified to lldd */
166 struct domain_device {
167 spinlock_t done_lock;
168 enum sas_device_type dev_type;
170 enum sas_linkrate linkrate;
171 enum sas_linkrate min_linkrate;
172 enum sas_linkrate max_linkrate;
176 struct domain_device *parent;
177 struct list_head siblings; /* devices on the same level */
178 struct asd_sas_port *port; /* shortcut to root of the tree */
181 struct list_head dev_list_node;
182 struct list_head disco_list_node; /* awaiting probe or destruct */
184 enum sas_protocol iproto;
185 enum sas_protocol tproto;
187 struct sas_rphy *rphy;
189 u8 sas_addr[SAS_ADDR_SIZE];
190 u8 hashed_sas_addr[HASHED_SAS_ADDR_SIZE];
195 struct expander_device ex_dev;
196 struct sata_device sata_dev; /* STP & directly attached */
197 struct ssp_device ssp_dev;
206 struct list_head drain_node;
207 struct work_struct work;
210 static inline bool dev_is_expander(enum sas_device_type type)
212 return type == SAS_EDGE_EXPANDER_DEVICE ||
213 type == SAS_FANOUT_EXPANDER_DEVICE;
216 static inline void INIT_SAS_WORK(struct sas_work *sw, void (*fn)(struct work_struct *))
218 INIT_WORK(&sw->work, fn);
219 INIT_LIST_HEAD(&sw->drain_node);
222 struct sas_discovery_event {
223 struct sas_work work;
224 struct asd_sas_port *port;
227 static inline struct sas_discovery_event *to_sas_discovery_event(struct work_struct *work)
229 struct sas_discovery_event *ev = container_of(work, typeof(*ev), work.work);
234 struct sas_discovery {
235 struct sas_discovery_event disc_work[DISC_NUM_EVENTS];
236 unsigned long pending;
237 u8 fanout_sas_addr[SAS_ADDR_SIZE];
238 u8 eeds_a[SAS_ADDR_SIZE];
239 u8 eeds_b[SAS_ADDR_SIZE];
243 /* The port struct is Class:RW, driver:RO */
244 struct asd_sas_port {
246 struct sas_discovery disc;
247 struct domain_device *port_dev;
248 spinlock_t dev_list_lock;
249 struct list_head dev_list;
250 struct list_head disco_list;
251 struct list_head destroy_list;
252 struct list_head sas_port_del_list;
253 enum sas_linkrate linkrate;
255 struct sas_work work;
261 enum sas_class class;
262 u8 sas_addr[SAS_ADDR_SIZE];
263 u8 attached_sas_addr[SAS_ADDR_SIZE];
264 enum sas_protocol iproto;
265 enum sas_protocol tproto;
267 enum sas_oob_mode oob_mode;
269 spinlock_t phy_list_lock;
270 struct list_head phy_list;
274 struct sas_ha_struct *ha;
276 struct sas_port *port;
278 void *lldd_port; /* not touched by the sas class code */
281 struct asd_sas_event {
282 struct sas_work work;
283 struct asd_sas_phy *phy;
287 static inline struct asd_sas_event *to_asd_sas_event(struct work_struct *work)
289 struct asd_sas_event *ev = container_of(work, typeof(*ev), work.work);
294 static inline void INIT_SAS_EVENT(struct asd_sas_event *ev,
295 void (*fn)(struct work_struct *),
296 struct asd_sas_phy *phy, int event)
298 INIT_SAS_WORK(&ev->work, fn);
303 #define SAS_PHY_SHUTDOWN_THRES 1024
305 /* The phy pretty much is controlled by the LLDD.
306 * The class only reads those fields.
318 /* The following are class:RO, driver:R/W */
319 int enabled; /* must be set */
321 int id; /* must be set */
322 enum sas_class class;
323 enum sas_protocol iproto;
324 enum sas_protocol tproto;
326 enum sas_phy_type type;
327 enum sas_phy_role role;
328 enum sas_oob_mode oob_mode;
329 enum sas_linkrate linkrate;
331 u8 *sas_addr; /* must be set */
332 u8 attached_sas_addr[SAS_ADDR_SIZE]; /* class:RO, driver: R/W */
334 spinlock_t frame_rcvd_lock;
335 u8 *frame_rcvd; /* must be set */
338 spinlock_t sas_prim_lock;
341 struct list_head port_phy_el; /* driver:RO */
342 struct asd_sas_port *port; /* Class:RW, driver: RO */
344 struct sas_ha_struct *ha; /* may be set; the class sets it anyway */
346 void *lldd_phy; /* not touched by the sas_class_code */
350 struct Scsi_Host *shost;
357 SAS_HA_ATA_EH_ACTIVE,
361 struct sas_ha_struct {
363 struct list_head defer_q; /* work queued while draining */
364 struct mutex drain_mutex;
368 wait_queue_head_t eh_wait_q;
369 struct list_head eh_dev_q;
371 struct mutex disco_mutex;
373 struct scsi_core core;
377 struct device *dev; /* should be set */
378 struct module *lldd_module; /* should be set */
380 struct workqueue_struct *event_q;
381 struct workqueue_struct *disco_q;
383 u8 *sas_addr; /* must be set */
384 u8 hashed_sas_addr[HASHED_SAS_ADDR_SIZE];
386 spinlock_t phy_port_lock;
387 struct asd_sas_phy **sas_phy; /* array of valid pointers, must be set */
388 struct asd_sas_port **sas_port; /* array of valid pointers, must be set */
389 int num_phys; /* must be set, gt 0, static */
391 int strict_wide_ports; /* both sas_addr and attached_sas_addr must match
392 * their siblings when forming wide ports */
394 /* LLDD calls these to notify the class of an event. */
395 int (*notify_port_event)(struct asd_sas_phy *, enum port_event);
396 int (*notify_phy_event)(struct asd_sas_phy *, enum phy_event);
398 void *lldd_ha; /* not touched by sas class code */
400 struct list_head eh_done_q; /* complete via scsi_eh_flush_done_q */
401 struct list_head eh_ata_q; /* scmds to promote from sas to ata eh */
406 #define SHOST_TO_SAS_HA(_shost) (*(struct sas_ha_struct **)(_shost)->hostdata)
408 static inline struct domain_device *
409 starget_to_domain_dev(struct scsi_target *starget) {
410 return starget->hostdata;
413 static inline struct domain_device *
414 sdev_to_domain_dev(struct scsi_device *sdev) {
415 return starget_to_domain_dev(sdev->sdev_target);
418 static inline struct ata_device *sas_to_ata_dev(struct domain_device *dev)
420 return &dev->sata_dev.ap->link.device[0];
423 static inline struct domain_device *
424 cmd_to_domain_dev(struct scsi_cmnd *cmd)
426 return sdev_to_domain_dev(cmd->device);
429 void sas_hash_addr(u8 *hashed, const u8 *sas_addr);
431 /* Before calling a notify event, LLDD should use this function
432 * when the link is severed (possibly from its tasklet).
433 * The idea is that the Class only reads those, while the LLDD,
434 * can R/W these (thus avoiding a race).
436 static inline void sas_phy_disconnected(struct asd_sas_phy *phy)
438 phy->oob_mode = OOB_NOT_CONNECTED;
439 phy->linkrate = SAS_LINK_RATE_UNKNOWN;
442 static inline unsigned int to_sas_gpio_od(int device, int bit)
444 return 3 * device + bit;
447 static inline void sas_put_local_phy(struct sas_phy *phy)
449 put_device(&phy->dev);
452 #ifdef CONFIG_SCSI_SAS_HOST_SMP
453 int try_test_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count);
455 static inline int try_test_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count)
461 /* ---------- Tasks ---------- */
463 service_response | SAS_TASK_COMPLETE | SAS_TASK_UNDELIVERED |
465 ---------------------+---------------------+-----------------------+
467 DEV_NO_RESPONSE | X | X |
470 DEVICE_UNKNOWN | | X |
472 ---------------------+---------------------+-----------------------+
475 enum service_response {
477 SAS_TASK_UNDELIVERED = -1,
481 /* The SAM_STAT_.. codes fit in the lower 6 bits, alias some of
482 * them here to silence 'case value not in enumerated type' warnings
484 __SAM_STAT_CHECK_CONDITION = SAM_STAT_CHECK_CONDITION,
486 SAS_DEV_NO_RESPONSE = 0x80,
502 /* When a task finishes with a response, the LLDD examines the
504 * - For an ATA task task_status_struct::stat is set to
505 * SAS_PROTO_RESPONSE, and the task_status_struct::buf is set to the
506 * contents of struct ata_task_resp.
507 * - For SSP tasks, if no data is present or status/TMF response
508 * is valid, task_status_struct::stat is set. If data is present
509 * (SENSE data), the LLDD copies up to SAS_STATUS_BUF_SIZE, sets
510 * task_status_struct::buf_valid_size, and task_status_struct::stat is
511 * set to SAM_CHECK_COND.
513 * "buf" has format SCSI Sense for SSP task, or struct ata_task_resp
516 * "frame_len" is the total frame length, which could be more or less
517 * than actually copied.
519 * Tasks ending with response, always set the residual field.
521 struct ata_task_resp {
523 u8 ending_fis[ATA_RESP_FIS_SIZE]; /* dev to host or data-in */
526 #define SAS_STATUS_BUF_SIZE 96
528 struct task_status_struct {
529 enum service_response resp;
530 enum exec_status stat;
533 u8 buf[SAS_STATUS_BUF_SIZE];
536 enum sas_open_rej_reason open_rej_reason;
539 /* ATA and ATAPI task queuable to a SAS LLDD.
541 struct sas_ata_task {
542 struct host_to_dev_fis fis;
543 u8 atapi_packet[16]; /* 0 if not ATAPI task */
545 u8 retry_count; /* hardware retry, should be > 0 */
547 u8 dma_xfer:1; /* PIO:0 or DMA:1 */
552 u8 device_control_reg_update:1;
555 struct sas_smp_task {
556 struct scatterlist smp_req;
557 struct scatterlist smp_resp;
560 enum task_attribute {
561 TASK_ATTR_SIMPLE = 0,
563 TASK_ATTR_ORDERED= 2,
567 struct sas_ssp_task {
568 u8 retry_count; /* hardware retry, should be > 0 */
571 u8 enable_first_burst:1;
572 enum task_attribute task_attr;
574 struct scsi_cmnd *cmd;
578 struct domain_device *dev;
580 spinlock_t task_state_lock;
581 unsigned task_state_flags;
583 enum sas_protocol task_proto;
586 struct sas_ata_task ata_task;
587 struct sas_smp_task smp_task;
588 struct sas_ssp_task ssp_task;
591 struct scatterlist *scatter;
594 u8 data_dir:2; /* Use PCI_DMA_... */
596 struct task_status_struct task_status;
597 void (*task_done)(struct sas_task *);
599 void *lldd_task; /* for use by LLDDs */
601 struct sas_task_slow *slow_task;
604 struct sas_task_slow {
605 /* standard/extra infrastructure for slow path commands (SMP and
606 * internal lldd commands
608 struct timer_list timer;
609 struct completion completion;
610 struct sas_task *task;
613 #define SAS_TASK_STATE_PENDING 1
614 #define SAS_TASK_STATE_DONE 2
615 #define SAS_TASK_STATE_ABORTED 4
616 #define SAS_TASK_NEED_DEV_RESET 8
617 #define SAS_TASK_AT_INITIATOR 16
619 extern struct sas_task *sas_alloc_task(gfp_t flags);
620 extern struct sas_task *sas_alloc_slow_task(gfp_t flags);
621 extern void sas_free_task(struct sas_task *task);
623 struct sas_domain_function_template {
624 /* The class calls these to notify the LLDD of an event. */
625 void (*lldd_port_formed)(struct asd_sas_phy *);
626 void (*lldd_port_deformed)(struct asd_sas_phy *);
628 /* The class calls these when a device is found or gone. */
629 int (*lldd_dev_found)(struct domain_device *);
630 void (*lldd_dev_gone)(struct domain_device *);
632 int (*lldd_execute_task)(struct sas_task *, gfp_t gfp_flags);
634 /* Task Management Functions. Must be called from process context. */
635 int (*lldd_abort_task)(struct sas_task *);
636 int (*lldd_abort_task_set)(struct domain_device *, u8 *lun);
637 int (*lldd_clear_aca)(struct domain_device *, u8 *lun);
638 int (*lldd_clear_task_set)(struct domain_device *, u8 *lun);
639 int (*lldd_I_T_nexus_reset)(struct domain_device *);
640 int (*lldd_ata_check_ready)(struct domain_device *);
641 void (*lldd_ata_set_dmamode)(struct domain_device *);
642 int (*lldd_lu_reset)(struct domain_device *, u8 *lun);
643 int (*lldd_query_task)(struct sas_task *);
645 /* Port and Adapter management */
646 int (*lldd_clear_nexus_port)(struct asd_sas_port *);
647 int (*lldd_clear_nexus_ha)(struct sas_ha_struct *);
650 int (*lldd_control_phy)(struct asd_sas_phy *, enum phy_func, void *);
653 int (*lldd_write_gpio)(struct sas_ha_struct *, u8 reg_type,
654 u8 reg_index, u8 reg_count, u8 *write_data);
657 extern int sas_register_ha(struct sas_ha_struct *);
658 extern int sas_unregister_ha(struct sas_ha_struct *);
659 extern void sas_prep_resume_ha(struct sas_ha_struct *sas_ha);
660 extern void sas_resume_ha(struct sas_ha_struct *sas_ha);
661 extern void sas_suspend_ha(struct sas_ha_struct *sas_ha);
663 int sas_set_phy_speed(struct sas_phy *phy, struct sas_phy_linkrates *rates);
664 int sas_phy_reset(struct sas_phy *phy, int hard_reset);
665 extern int sas_queuecommand(struct Scsi_Host *, struct scsi_cmnd *);
666 extern int sas_target_alloc(struct scsi_target *);
667 extern int sas_slave_configure(struct scsi_device *);
668 extern int sas_change_queue_depth(struct scsi_device *, int new_depth);
669 extern int sas_bios_param(struct scsi_device *, struct block_device *,
670 sector_t capacity, int *hsc);
671 extern struct scsi_transport_template *
672 sas_domain_attach_transport(struct sas_domain_function_template *);
673 extern struct device_attribute dev_attr_phy_event_threshold;
675 int sas_discover_root_expander(struct domain_device *);
677 void sas_init_ex_attr(void);
679 int sas_ex_revalidate_domain(struct domain_device *);
681 void sas_unregister_domain_devices(struct asd_sas_port *port, int gone);
682 void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *);
683 int sas_discover_event(struct asd_sas_port *, enum discover_event ev);
685 int sas_discover_sata(struct domain_device *);
686 int sas_discover_end_dev(struct domain_device *);
688 void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *);
690 void sas_init_dev(struct domain_device *);
692 void sas_task_abort(struct sas_task *);
693 int sas_eh_abort_handler(struct scsi_cmnd *cmd);
694 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd);
695 int sas_eh_target_reset_handler(struct scsi_cmnd *cmd);
697 extern void sas_target_destroy(struct scsi_target *);
698 extern int sas_slave_alloc(struct scsi_device *);
699 extern int sas_ioctl(struct scsi_device *sdev, unsigned int cmd,
701 extern int sas_drain_work(struct sas_ha_struct *ha);
703 extern void sas_ssp_task_response(struct device *dev, struct sas_task *task,
704 struct ssp_response_iu *iu);
705 struct sas_phy *sas_get_local_phy(struct domain_device *dev);
707 int sas_request_addr(struct Scsi_Host *shost, u8 *addr);
709 #endif /* _SASLIB_H_ */