libsas.h

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/*
 * SAS host prototypes and structures header file
 *
 * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
 * Copyright (C) 2005 Luben Tuikov <[email protected]>
 *
 * This file is licensed under GPLv2.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 *
 */

#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_class {
    SAS,
    EXPANDER
};

enum sas_phy_role {
    PHY_ROLE_NONE = 0,
    PHY_ROLE_TARGET = 0x40,
    PHY_ROLE_INITIATOR = 0x80,
};

enum sas_phy_type {
        PHY_TYPE_PHYSICAL,
        PHY_TYPE_VIRTUAL
};

/* The events are mnemonically described in sas_dump.c
 * so when updating/adding events here, please also
 * update the other file too.
 */
enum ha_event {
    HAE_RESET             = 0U,
    HA_NUM_EVENTS         = 1,
};

enum port_event {
    PORTE_BYTES_DMAED     = 0U,
    PORTE_BROADCAST_RCVD  = 1,
    PORTE_LINK_RESET_ERR  = 2,
    PORTE_TIMER_EVENT     = 3,
    PORTE_HARD_RESET      = 4,
    PORT_NUM_EVENTS       = 5,
};

enum phy_event {
    PHYE_LOSS_OF_SIGNAL   = 0U,
    PHYE_OOB_DONE         = 1,
    PHYE_OOB_ERROR        = 2,
    PHYE_SPINUP_HOLD      = 3, /* hot plug SATA, no COMWAKE sent */
    PHYE_RESUME_TIMEOUT   = 4,
    PHY_NUM_EVENTS        = 5,
};

enum discover_event {
    DISCE_DISCOVER_DOMAIN   = 0U,
    DISCE_REVALIDATE_DOMAIN = 1,
    DISCE_PORT_GONE         = 2,
    DISCE_PROBE     = 3,
    DISCE_SUSPEND       = 4,
    DISCE_RESUME        = 5,
    DISCE_DESTRUCT      = 6,
    DISC_NUM_EVENTS     = 7,
};

/* ---------- 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_dev_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 ---------- */
enum ata_command_set {
        ATA_COMMAND_SET   = 0,
        ATAPI_COMMAND_SET = 1,
};

#define ATA_RESP_FIS_SIZE 24

struct sata_device {
        enum   ata_command_set command_set;
        struct smp_resp        rps_resp; /* report_phy_sata_resp */
        u8     port_no;        /* port number, if this is a PM (Port) */
    int    pm_result;

    struct ata_port *ap;
    struct ata_host ata_host;
    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_dev_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 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[8];
    u8     eeds_a[8];
    u8     eeds_b[8];
    int    max_level;
};

/* The port struct is Class:RW, driver:RO */
struct asd_sas_port {
/* private: */
    struct completion port_gone_completion;

    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;
    enum   sas_linkrate linkrate;

    struct sas_work work;
    int suspended;

/* public: */
    int id;

    enum sas_class   class;
    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;
};

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;
}

/* The phy pretty much is controlled by the LLDD.
 * The class only reads those fields.
 */
struct asd_sas_phy {
/* private: */
    struct asd_sas_event   port_events[PORT_NUM_EVENTS];
    struct asd_sas_event   phy_events[PHY_NUM_EVENTS];

    unsigned long port_events_pending;
    unsigned long phy_events_pending;

    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_class class;
    enum sas_protocol iproto;
    enum sas_protocol tproto;

    enum sas_phy_type  type;
    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 */
};

struct scsi_core {
    struct Scsi_Host *shost;

    struct mutex      task_queue_flush;
    spinlock_t        task_queue_lock;
    struct list_head  task_queue;
    int               task_queue_size;

    struct task_struct *queue_thread;
};

struct sas_ha_event {
    struct sas_work work;
    struct sas_ha_struct *ha;
};

static inline struct sas_ha_event *to_sas_ha_event(struct work_struct *work)
{
    struct sas_ha_event *ev = container_of(work, typeof(*ev), work.work);

    return ev;
}

enum sas_ha_state {
    SAS_HA_REGISTERED,
    SAS_HA_DRAINING,
    SAS_HA_ATA_EH_ACTIVE,
    SAS_HA_FROZEN,
};

struct sas_ha_struct {
/* private: */
    struct sas_ha_event ha_events[HA_NUM_EVENTS];
    unsigned long    pending;

    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_core core;

/* public: */
    char *sas_ha_name;
    struct device *dev;   /* should be set */
    struct module *lldd_module; /* should be set */

    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 */

    /* The class calls this to send a task for execution. */
    int lldd_max_execute_num;
    int lldd_queue_size;
    int strict_wide_ports; /* both sas_addr and attached_sas_addr must match
                * their siblings when forming wide ports */

    /* LLDD calls these to notify the class of an event. */
    void (*notify_ha_event)(struct sas_ha_struct *, enum ha_event);
    void (*notify_port_event)(struct asd_sas_phy *, enum port_event);
    void (*notify_phy_event)(struct asd_sas_phy *, enum phy_event);

    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 */
};

#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);
}

void sas_hash_addr(u8 *hashed, const u8 *sas_addr);

/* 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 {
    /* The SAM_STAT_.. codes fit in the lower 6 bits, alias some of
     * them here to silence 'case value not in enumerated type' warnings
     */
    __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_SG_ERR,
    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     retry_count;   /* hardware retry, should be > 0 */

    u8     dma_xfer:1;    /* PIO:0 or DMA:1 */
    u8     use_ncq:1;
    u8     set_affil_pol:1;
    u8     stp_affil_pol:1;

    u8     device_control_reg_update:1;
};

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     retry_count;   /* hardware retry, should be > 0 */

    u8     LUN[8];
    u8     enable_first_burst:1;
    enum   task_attribute task_attr;
    u8     task_prio;
    u8     cdb[16];
};

struct sas_task {
    struct domain_device *dev;
    struct list_head      list;

    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 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_task_slow {
    /* standard/extra infrastructure for slow path commands (SMP and
     * internal lldd commands
     */
    struct timer_list     timer;
    struct completion     completion;
};

#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
#define SAS_TASK_AT_INITIATOR       16

extern struct sas_task *sas_alloc_task(gfp_t flags);
extern struct sas_task *sas_alloc_slow_task(gfp_t flags);
extern void sas_free_task(struct sas_task *task);

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 *, int num,
                 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_aca)(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 *);

    /* 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_suspend_ha(struct sas_ha_struct *sas_ha);

int sas_set_phy_speed(struct sas_phy *phy,
              struct sas_phy_linkrates *rates);
int sas_phy_reset(struct sas_phy *phy, int hard_reset);
int sas_queue_up(struct sas_task *task);
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,
                  int reason);
extern int sas_change_queue_type(struct scsi_device *, int qt);
extern int sas_bios_param(struct scsi_device *,
              struct block_device *,
              sector_t capacity, int *hsc);
extern struct scsi_transport_template *
sas_domain_attach_transport(struct sas_domain_function_template *);
extern void sas_domain_release_transport(struct scsi_transport_template *);

int  sas_discover_root_expander(struct domain_device *);

void sas_init_ex_attr(void);

int  sas_ex_revalidate_domain(struct domain_device *);

void sas_unregister_domain_devices(struct asd_sas_port *port, int gone);
void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *);
int  sas_discover_event(struct asd_sas_port *, enum discover_event ev);

int  sas_discover_sata(struct domain_device *);
int  sas_discover_end_dev(struct domain_device *);

void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *);

void sas_init_dev(struct domain_device *);

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_bus_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, int cmd, void __user *arg);
extern int sas_drain_work(struct sas_ha_struct *ha);

extern int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
               struct request *req);

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);

#endif /* _SASLIB_H_ */