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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* SAS host prototypes and structures header file
*
* Copyright (C) 2005 Adaptec, Inc. All rights reserved.
* Copyright (C) 2005 Luben Tuikov <[email protected]>
*/
#ifndef _LIBSAS_H_
#define _LIBSAS_H_
#include <linux/timer.h>
#include <linux/pci.h>
#include <scsi/sas.h>
#include <linux/libata.h>
#include <linux/list.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_transport_sas.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
struct block_device;
enum sas_phy_role {
PHY_ROLE_NONE = 0,
PHY_ROLE_TARGET = 0x40,
PHY_ROLE_INITIATOR = 0x80,
};
/* The events are mnemonically described in sas_dump.c
* so when updating/adding events here, please also
* update the other file too.
*/
enum port_event {
PORTE_BYTES_DMAED = 0U,
PORTE_BROADCAST_RCVD,
PORTE_LINK_RESET_ERR,
PORTE_TIMER_EVENT,
PORTE_HARD_RESET,
PORT_NUM_EVENTS,
};
enum phy_event {
PHYE_LOSS_OF_SIGNAL = 0U,
PHYE_OOB_DONE,
PHYE_OOB_ERROR,
PHYE_SPINUP_HOLD, /* hot plug SATA, no COMWAKE sent */
PHYE_RESUME_TIMEOUT,
PHYE_SHUTDOWN,
PHY_NUM_EVENTS,
};
enum discover_event {
DISCE_DISCOVER_DOMAIN = 0U,
DISCE_REVALIDATE_DOMAIN,
DISCE_SUSPEND,
DISCE_RESUME,
DISC_NUM_EVENTS,
};
/* ---------- Expander Devices ---------- */
#define to_dom_device(_obj) container_of(_obj, struct domain_device, dev_obj)
#define to_dev_attr(_attr) container_of(_attr, struct domain_dev_attribute,\
attr)
enum routing_attribute {
DIRECT_ROUTING,
SUBTRACTIVE_ROUTING,
TABLE_ROUTING,
};
enum ex_phy_state {
PHY_EMPTY,
PHY_VACANT,
PHY_NOT_PRESENT,
PHY_DEVICE_DISCOVERED
};
struct ex_phy {
int phy_id;
enum ex_phy_state phy_state;
enum sas_device_type attached_dev_type;
enum sas_linkrate linkrate;
u8 attached_sata_host:1;
u8 attached_sata_dev:1;
u8 attached_sata_ps:1;
enum sas_protocol attached_tproto;
enum sas_protocol attached_iproto;
u8 attached_sas_addr[SAS_ADDR_SIZE];
u8 attached_phy_id;
int phy_change_count;
enum routing_attribute routing_attr;
u8 virtual:1;
int last_da_index;
struct sas_phy *phy;
struct sas_port *port;
};
struct expander_device {
struct list_head children;
int ex_change_count;
u16 max_route_indexes;
u8 num_phys;
u8 t2t_supp:1;
u8 configuring:1;
u8 conf_route_table:1;
u8 enclosure_logical_id[8];
struct ex_phy *ex_phy;
struct sas_port *parent_port;
struct mutex cmd_mutex;
};
/* ---------- SATA device ---------- */
#define ATA_RESP_FIS_SIZE 24
struct sata_device {
unsigned int class;
u8 port_no; /* port number, if this is a PM (Port) */
struct ata_port *ap;
struct ata_host *ata_host;
struct smp_rps_resp rps_resp ____cacheline_aligned; /* report_phy_sata_resp */
u8 fis[ATA_RESP_FIS_SIZE];
};
struct ssp_device {
struct list_head eh_list_node; /* pending a user requested eh action */
struct scsi_lun reset_lun;
};
enum {
SAS_DEV_GONE,
SAS_DEV_FOUND, /* device notified to lldd */
SAS_DEV_DESTROY,
SAS_DEV_EH_PENDING,
SAS_DEV_LU_RESET,
SAS_DEV_RESET,
};
struct domain_device {
spinlock_t done_lock;
enum sas_device_type dev_type;
enum sas_linkrate linkrate;
enum sas_linkrate min_linkrate;
enum sas_linkrate max_linkrate;
int pathways;
struct domain_device *parent;
struct list_head siblings; /* devices on the same level */
struct asd_sas_port *port; /* shortcut to root of the tree */
struct sas_phy *phy;
struct list_head dev_list_node;
struct list_head disco_list_node; /* awaiting probe or destruct */
enum sas_protocol iproto;
enum sas_protocol tproto;
struct sas_rphy *rphy;
u8 sas_addr[SAS_ADDR_SIZE];
u8 hashed_sas_addr[HASHED_SAS_ADDR_SIZE];
u8 frame_rcvd[32];
union {
struct expander_device ex_dev;
struct sata_device sata_dev; /* STP & directly attached */
struct ssp_device ssp_dev;
};
void *lldd_dev;
unsigned long state;
struct kref kref;
};
struct sas_work {
struct list_head drain_node;
struct work_struct work;
};
static inline bool dev_is_expander(enum sas_device_type type)
{
return type == SAS_EDGE_EXPANDER_DEVICE ||
type == SAS_FANOUT_EXPANDER_DEVICE;
}
static inline void INIT_SAS_WORK(struct sas_work *sw, void (*fn)(struct work_struct *))
{
INIT_WORK(&sw->work, fn);
INIT_LIST_HEAD(&sw->drain_node);
}
struct sas_discovery_event {
struct sas_work work;
struct asd_sas_port *port;
};
static inline struct sas_discovery_event *to_sas_discovery_event(struct work_struct *work)
{
struct sas_discovery_event *ev = container_of(work, typeof(*ev), work.work);
return ev;
}
struct sas_discovery {
struct sas_discovery_event disc_work[DISC_NUM_EVENTS];
unsigned long pending;
u8 fanout_sas_addr[SAS_ADDR_SIZE];
u8 eeds_a[SAS_ADDR_SIZE];
u8 eeds_b[SAS_ADDR_SIZE];
int max_level;
};
/* The port struct is Class:RW, driver:RO */
struct asd_sas_port {
/* private: */
struct sas_discovery disc;
struct domain_device *port_dev;
spinlock_t dev_list_lock;
struct list_head dev_list;
struct list_head disco_list;
struct list_head destroy_list;
struct list_head sas_port_del_list;
enum sas_linkrate linkrate;
struct sas_work work;
int suspended;
/* public: */
int id;
u8 sas_addr[SAS_ADDR_SIZE];
u8 attached_sas_addr[SAS_ADDR_SIZE];
enum sas_protocol iproto;
enum sas_protocol tproto;
enum sas_oob_mode oob_mode;
spinlock_t phy_list_lock;
struct list_head phy_list;
int num_phys;
u32 phy_mask;
struct sas_ha_struct *ha;
struct sas_port *port;
void *lldd_port; /* not touched by the sas class code */
};
struct asd_sas_event {
struct sas_work work;
struct asd_sas_phy *phy;
int event;
};
static inline struct asd_sas_event *to_asd_sas_event(struct work_struct *work)
{
struct asd_sas_event *ev = container_of(work, typeof(*ev), work.work);
return ev;
}
static inline void INIT_SAS_EVENT(struct asd_sas_event *ev,
void (*fn)(struct work_struct *),
struct asd_sas_phy *phy, int event)
{
INIT_SAS_WORK(&ev->work, fn);
ev->phy = phy;
ev->event = event;
}
#define SAS_PHY_SHUTDOWN_THRES 1024
/* The phy pretty much is controlled by the LLDD.
* The class only reads those fields.
*/
struct asd_sas_phy {
/* private: */
atomic_t event_nr;
int in_shutdown;
int error;
int suspended;
struct sas_phy *phy;
/* public: */
/* The following are class:RO, driver:R/W */
int enabled; /* must be set */
int id; /* must be set */
enum sas_protocol iproto;
enum sas_protocol tproto;
enum sas_phy_role role;
enum sas_oob_mode oob_mode;
enum sas_linkrate linkrate;
u8 *sas_addr; /* must be set */
u8 attached_sas_addr[SAS_ADDR_SIZE]; /* class:RO, driver: R/W */
spinlock_t frame_rcvd_lock;
u8 *frame_rcvd; /* must be set */
int frame_rcvd_size;
spinlock_t sas_prim_lock;
u32 sas_prim;
struct list_head port_phy_el; /* driver:RO */
struct asd_sas_port *port; /* Class:RW, driver: RO */
struct sas_ha_struct *ha; /* may be set; the class sets it anyway */
void *lldd_phy; /* not touched by the sas_class_code */
};
enum sas_ha_state {
SAS_HA_REGISTERED,
SAS_HA_DRAINING,
SAS_HA_ATA_EH_ACTIVE,
SAS_HA_FROZEN,
SAS_HA_RESUMING,
};
struct sas_ha_struct {
/* private: */
struct list_head defer_q; /* work queued while draining */
struct mutex drain_mutex;
unsigned long state;
spinlock_t lock;
int eh_active;
wait_queue_head_t eh_wait_q;
struct list_head eh_dev_q;
struct mutex disco_mutex;
struct Scsi_Host *shost;
/* public: */
char *sas_ha_name;
struct device *dev; /* should be set */
struct workqueue_struct *event_q;
struct workqueue_struct *disco_q;
u8 *sas_addr; /* must be set */
u8 hashed_sas_addr[HASHED_SAS_ADDR_SIZE];
spinlock_t phy_port_lock;
struct asd_sas_phy **sas_phy; /* array of valid pointers, must be set */
struct asd_sas_port **sas_port; /* array of valid pointers, must be set */
int num_phys; /* must be set, gt 0, static */
int strict_wide_ports; /* both sas_addr and attached_sas_addr must match
* their siblings when forming wide ports */
void *lldd_ha; /* not touched by sas class code */
struct list_head eh_done_q; /* complete via scsi_eh_flush_done_q */
struct list_head eh_ata_q; /* scmds to promote from sas to ata eh */
int event_thres;
};
#define SHOST_TO_SAS_HA(_shost) (*(struct sas_ha_struct **)(_shost)->hostdata)
static inline struct domain_device *
starget_to_domain_dev(struct scsi_target *starget) {
return starget->hostdata;
}
static inline struct domain_device *
sdev_to_domain_dev(struct scsi_device *sdev) {
return starget_to_domain_dev(sdev->sdev_target);
}
static inline struct ata_device *sas_to_ata_dev(struct domain_device *dev)
{
return &dev->sata_dev.ap->link.device[0];
}
static inline struct domain_device *
cmd_to_domain_dev(struct scsi_cmnd *cmd)
{
return sdev_to_domain_dev(cmd->device);
}
/* Before calling a notify event, LLDD should use this function
* when the link is severed (possibly from its tasklet).
* The idea is that the Class only reads those, while the LLDD,
* can R/W these (thus avoiding a race).
*/
static inline void sas_phy_disconnected(struct asd_sas_phy *phy)
{
phy->oob_mode = OOB_NOT_CONNECTED;
phy->linkrate = SAS_LINK_RATE_UNKNOWN;
}
static inline unsigned int to_sas_gpio_od(int device, int bit)
{
return 3 * device + bit;
}
static inline void sas_put_local_phy(struct sas_phy *phy)
{
put_device(&phy->dev);
}
#ifdef CONFIG_SCSI_SAS_HOST_SMP
int try_test_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count);
#else
static inline int try_test_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count)
{
return -1;
}
#endif
/* ---------- Tasks ---------- */
/*
service_response | SAS_TASK_COMPLETE | SAS_TASK_UNDELIVERED |
exec_status | | |
---------------------+---------------------+-----------------------+
SAM_... | X | |
DEV_NO_RESPONSE | X | X |
INTERRUPTED | X | |
QUEUE_FULL | | X |
DEVICE_UNKNOWN | | X |
SG_ERR | | X |
---------------------+---------------------+-----------------------+
*/
enum service_response {
SAS_TASK_COMPLETE,
SAS_TASK_UNDELIVERED = -1,
};
enum exec_status {
/*
* Values 0..0x7f are used to return the SAM_STAT_* codes. To avoid
* 'case value not in enumerated type' compiler warnings every value
* returned through the exec_status enum needs an alias with the SAS_
* prefix here.
*/
SAS_SAM_STAT_GOOD = SAM_STAT_GOOD,
SAS_SAM_STAT_BUSY = SAM_STAT_BUSY,
SAS_SAM_STAT_TASK_ABORTED = SAM_STAT_TASK_ABORTED,
SAS_SAM_STAT_CHECK_CONDITION = SAM_STAT_CHECK_CONDITION,
SAS_DEV_NO_RESPONSE = 0x80,
SAS_DATA_UNDERRUN,
SAS_DATA_OVERRUN,
SAS_INTERRUPTED,
SAS_QUEUE_FULL,
SAS_DEVICE_UNKNOWN,
SAS_OPEN_REJECT,
SAS_OPEN_TO,
SAS_PROTO_RESPONSE,
SAS_PHY_DOWN,
SAS_NAK_R_ERR,
SAS_PENDING,
SAS_ABORTED_TASK,
};
/* When a task finishes with a response, the LLDD examines the
* response:
* - For an ATA task task_status_struct::stat is set to
* SAS_PROTO_RESPONSE, and the task_status_struct::buf is set to the
* contents of struct ata_task_resp.
* - For SSP tasks, if no data is present or status/TMF response
* is valid, task_status_struct::stat is set. If data is present
* (SENSE data), the LLDD copies up to SAS_STATUS_BUF_SIZE, sets
* task_status_struct::buf_valid_size, and task_status_struct::stat is
* set to SAM_CHECK_COND.
*
* "buf" has format SCSI Sense for SSP task, or struct ata_task_resp
* for ATA task.
*
* "frame_len" is the total frame length, which could be more or less
* than actually copied.
*
* Tasks ending with response, always set the residual field.
*/
struct ata_task_resp {
u16 frame_len;
u8 ending_fis[ATA_RESP_FIS_SIZE]; /* dev to host or data-in */
};
#define SAS_STATUS_BUF_SIZE 96
struct task_status_struct {
enum service_response resp;
enum exec_status stat;
int buf_valid_size;
u8 buf[SAS_STATUS_BUF_SIZE];
u32 residual;
enum sas_open_rej_reason open_rej_reason;
};
/* ATA and ATAPI task queuable to a SAS LLDD.
*/
struct sas_ata_task {
struct host_to_dev_fis fis;
u8 atapi_packet[16]; /* 0 if not ATAPI task */
u8 dma_xfer:1; /* PIO:0 or DMA:1 */
u8 use_ncq:1;
u8 return_fis_on_success:1;
u8 device_control_reg_update:1;
bool force_phy;
int force_phy_id;
};
/* LLDDs rely on these values */
enum sas_internal_abort {
SAS_INTERNAL_ABORT_SINGLE = 0,
SAS_INTERNAL_ABORT_DEV = 1,
};
struct sas_internal_abort_task {
enum sas_internal_abort type;
unsigned int qid;
u16 tag;
};
struct sas_smp_task {
struct scatterlist smp_req;
struct scatterlist smp_resp;
};
enum task_attribute {
TASK_ATTR_SIMPLE = 0,
TASK_ATTR_HOQ = 1,
TASK_ATTR_ORDERED= 2,
TASK_ATTR_ACA = 4,
};
struct sas_ssp_task {
u8 LUN[8];
enum task_attribute task_attr;
struct scsi_cmnd *cmd;
};
struct sas_tmf_task {
u8 tmf;
u16 tag_of_task_to_be_managed;
};
struct sas_task {
struct domain_device *dev;
spinlock_t task_state_lock;
unsigned task_state_flags;
enum sas_protocol task_proto;
union {
struct sas_ata_task ata_task;
struct sas_smp_task smp_task;
struct sas_ssp_task ssp_task;
struct sas_internal_abort_task abort_task;
};
struct scatterlist *scatter;
int num_scatter;
u32 total_xfer_len;
u8 data_dir:2; /* Use PCI_DMA_... */
struct task_status_struct task_status;
void (*task_done)(struct sas_task *);
void *lldd_task; /* for use by LLDDs */
void *uldd_task;
struct sas_task_slow *slow_task;
struct sas_tmf_task *tmf;
};
struct sas_task_slow {
/* standard/extra infrastructure for slow path commands (SMP and
* internal lldd commands
*/
struct timer_list timer;
struct completion completion;
struct sas_task *task;
};
#define SAS_TASK_STATE_PENDING 1
#define SAS_TASK_STATE_DONE 2
#define SAS_TASK_STATE_ABORTED 4
#define SAS_TASK_NEED_DEV_RESET 8
static inline bool sas_is_internal_abort(struct sas_task *task)
{
return task->task_proto == SAS_PROTOCOL_INTERNAL_ABORT;
}
static inline struct request *sas_task_find_rq(struct sas_task *task)
{
struct scsi_cmnd *scmd;
if (task->task_proto & SAS_PROTOCOL_STP_ALL) {
struct ata_queued_cmd *qc = task->uldd_task;
scmd = qc ? qc->scsicmd : NULL;
} else {
scmd = task->uldd_task;
}
if (!scmd)
return NULL;
return scsi_cmd_to_rq(scmd);
}
struct sas_domain_function_template {
/* The class calls these to notify the LLDD of an event. */
void (*lldd_port_formed)(struct asd_sas_phy *);
void (*lldd_port_deformed)(struct asd_sas_phy *);
/* The class calls these when a device is found or gone. */
int (*lldd_dev_found)(struct domain_device *);
void (*lldd_dev_gone)(struct domain_device *);
int (*lldd_execute_task)(struct sas_task *, gfp_t gfp_flags);
/* Task Management Functions. Must be called from process context. */
int (*lldd_abort_task)(struct sas_task *);
int (*lldd_abort_task_set)(struct domain_device *, u8 *lun);
int (*lldd_clear_task_set)(struct domain_device *, u8 *lun);
int (*lldd_I_T_nexus_reset)(struct domain_device *);
int (*lldd_ata_check_ready)(struct domain_device *);
void (*lldd_ata_set_dmamode)(struct domain_device *);
int (*lldd_lu_reset)(struct domain_device *, u8 *lun);
int (*lldd_query_task)(struct sas_task *);
/* Special TMF callbacks */
void (*lldd_tmf_exec_complete)(struct domain_device *dev);
void (*lldd_tmf_aborted)(struct sas_task *task);
bool (*lldd_abort_timeout)(struct sas_task *task, void *data);
/* Port and Adapter management */
int (*lldd_clear_nexus_port)(struct asd_sas_port *);
int (*lldd_clear_nexus_ha)(struct sas_ha_struct *);
/* Phy management */
int (*lldd_control_phy)(struct asd_sas_phy *, enum phy_func, void *);
/* GPIO support */
int (*lldd_write_gpio)(struct sas_ha_struct *, u8 reg_type,
u8 reg_index, u8 reg_count, u8 *write_data);
};
extern int sas_register_ha(struct sas_ha_struct *);
extern int sas_unregister_ha(struct sas_ha_struct *);
extern void sas_prep_resume_ha(struct sas_ha_struct *sas_ha);
extern void sas_resume_ha(struct sas_ha_struct *sas_ha);
extern void sas_resume_ha_no_sync(struct sas_ha_struct *sas_ha);
extern void sas_suspend_ha(struct sas_ha_struct *sas_ha);
int sas_phy_reset(struct sas_phy *phy, int hard_reset);
int sas_phy_enable(struct sas_phy *phy, int enable);
extern int sas_queuecommand(struct Scsi_Host *, struct scsi_cmnd *);
extern int sas_target_alloc(struct scsi_target *);
extern int sas_slave_configure(struct scsi_device *);
extern int sas_change_queue_depth(struct scsi_device *, int new_depth);
extern int sas_bios_param(struct scsi_device *, struct block_device *,
sector_t capacity, int *hsc);
int sas_execute_internal_abort_single(struct domain_device *device,
u16 tag, unsigned int qid,
void *data);
int sas_execute_internal_abort_dev(struct domain_device *device,
unsigned int qid, void *data);
extern struct scsi_transport_template *
sas_domain_attach_transport(struct sas_domain_function_template *);
extern struct device_attribute dev_attr_phy_event_threshold;
void sas_task_abort(struct sas_task *);
int sas_eh_abort_handler(struct scsi_cmnd *cmd);
int sas_eh_device_reset_handler(struct scsi_cmnd *cmd);
int sas_eh_target_reset_handler(struct scsi_cmnd *cmd);
extern void sas_target_destroy(struct scsi_target *);
extern int sas_slave_alloc(struct scsi_device *);
extern int sas_ioctl(struct scsi_device *sdev, unsigned int cmd,
void __user *arg);
extern int sas_drain_work(struct sas_ha_struct *ha);
extern void sas_ssp_task_response(struct device *dev, struct sas_task *task,
struct ssp_response_iu *iu);
struct sas_phy *sas_get_local_phy(struct domain_device *dev);
int sas_request_addr(struct Scsi_Host *shost, u8 *addr);
int sas_abort_task_set(struct domain_device *dev, u8 *lun);
int sas_clear_task_set(struct domain_device *dev, u8 *lun);
int sas_lu_reset(struct domain_device *dev, u8 *lun);
int sas_query_task(struct sas_task *task, u16 tag);
int sas_abort_task(struct sas_task *task, u16 tag);
int sas_find_attached_phy_id(struct expander_device *ex_dev,
struct domain_device *dev);
void sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event,
gfp_t gfp_flags);
void sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event,
gfp_t gfp_flags);
#endif /* _SASLIB_H_ */
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