root/include/scsi/scsi_transport_sas.h

INCLUDED FROM

DEFINITIONS

1. sas_protocol_ata
2. scsi_is_sas_expander_device

#ifndef SCSI_TRANSPORT_SAS_H
#define SCSI_TRANSPORT_SAS_H

#include <linux/transport_class.h>
#include <linux/types.h>
#include <linux/mutex.h>
#include <scsi/sas.h>

struct scsi_transport_template;
struct sas_rphy;
struct request;

enum sas_device_type {
        SAS_PHY_UNUSED = 0,
        SAS_END_DEVICE = 1,
        SAS_EDGE_EXPANDER_DEVICE = 2,
        SAS_FANOUT_EXPANDER_DEVICE = 3,
};

static inline int sas_protocol_ata(enum sas_protocol proto)
{
        return ((proto & SAS_PROTOCOL_SATA) ||
                (proto & SAS_PROTOCOL_STP))? 1 : 0;
}

enum sas_linkrate {
        /* These Values are defined in the SAS standard */
        SAS_LINK_RATE_UNKNOWN = 0,
        SAS_PHY_DISABLED = 1,
        SAS_PHY_RESET_PROBLEM = 2,
        SAS_SATA_SPINUP_HOLD = 3,
        SAS_SATA_PORT_SELECTOR = 4,
        SAS_PHY_RESET_IN_PROGRESS = 5,
        SAS_LINK_RATE_1_5_GBPS = 8,
        SAS_LINK_RATE_G1 = SAS_LINK_RATE_1_5_GBPS,
        SAS_LINK_RATE_3_0_GBPS = 9,
        SAS_LINK_RATE_G2 = SAS_LINK_RATE_3_0_GBPS,
        SAS_LINK_RATE_6_0_GBPS = 10,
        /* These are virtual to the transport class and may never
         * be signalled normally since the standard defined field
         * is only 4 bits */
        SAS_LINK_RATE_FAILED = 0x10,
        SAS_PHY_VIRTUAL = 0x11,
};

struct sas_identify {
        enum sas_device_type    device_type;
        enum sas_protocol       initiator_port_protocols;
        enum sas_protocol       target_port_protocols;
        u64                     sas_address;
        u8                      phy_identifier;
};

struct sas_phy {
        struct device           dev;
        int                     number;
        int                     enabled;

        /* phy identification */
        struct sas_identify     identify;

        /* phy attributes */
        enum sas_linkrate       negotiated_linkrate;
        enum sas_linkrate       minimum_linkrate_hw;
        enum sas_linkrate       minimum_linkrate;
        enum sas_linkrate       maximum_linkrate_hw;
        enum sas_linkrate       maximum_linkrate;

        /* link error statistics */
        u32                     invalid_dword_count;
        u32                     running_disparity_error_count;
        u32                     loss_of_dword_sync_count;
        u32                     phy_reset_problem_count;

        /* for the list of phys belonging to a port */
        struct list_head        port_siblings;

        struct work_struct      reset_work;
};

#define dev_to_phy(d) \
        container_of((d), struct sas_phy, dev)
#define transport_class_to_phy(dev) \
        dev_to_phy((dev)->parent)
#define phy_to_shost(phy) \
        dev_to_shost((phy)->dev.parent)

struct request_queue;
struct sas_rphy {
        struct device           dev;
        struct sas_identify     identify;
        struct list_head        list;
        struct request_queue    *q;
        u32                     scsi_target_id;
};

#define dev_to_rphy(d) \
        container_of((d), struct sas_rphy, dev)
#define transport_class_to_rphy(dev) \
        dev_to_rphy((dev)->parent)
#define rphy_to_shost(rphy) \
        dev_to_shost((rphy)->dev.parent)
#define target_to_rphy(targ) \
        dev_to_rphy((targ)->dev.parent)

struct sas_end_device {
        struct sas_rphy         rphy;
        /* flags */
        unsigned                ready_led_meaning:1;
        /* parameters */
        u16                     I_T_nexus_loss_timeout;
        u16                     initiator_response_timeout;
};
#define rphy_to_end_device(r) \
        container_of((r), struct sas_end_device, rphy)

struct sas_expander_device {
        int    level;
        int    next_port_id;

        #define SAS_EXPANDER_VENDOR_ID_LEN      8
        char   vendor_id[SAS_EXPANDER_VENDOR_ID_LEN+1];
        #define SAS_EXPANDER_PRODUCT_ID_LEN     16
        char   product_id[SAS_EXPANDER_PRODUCT_ID_LEN+1];
        #define SAS_EXPANDER_PRODUCT_REV_LEN    4
        char   product_rev[SAS_EXPANDER_PRODUCT_REV_LEN+1];
        #define SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN    8
        char   component_vendor_id[SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN+1];
        u16    component_id;
        u8     component_revision_id;

        struct sas_rphy         rphy;

};
#define rphy_to_expander_device(r) \
        container_of((r), struct sas_expander_device, rphy)

struct sas_port {
        struct device           dev;

        int                     port_identifier;
        int                     num_phys;
        /* port flags */
        unsigned int            is_backlink:1;

        /* the other end of the link */
        struct sas_rphy         *rphy;

        struct mutex            phy_list_mutex;
        struct list_head        phy_list;
};

#define dev_to_sas_port(d) \
        container_of((d), struct sas_port, dev)
#define transport_class_to_sas_port(dev) \
        dev_to_sas_port((dev)->parent)

struct sas_phy_linkrates {
        enum sas_linkrate maximum_linkrate;
        enum sas_linkrate minimum_linkrate;
};

/* The functions by which the transport class and the driver communicate */
struct sas_function_template {
        int (*get_linkerrors)(struct sas_phy *);
        int (*get_enclosure_identifier)(struct sas_rphy *, u64 *);
        int (*get_bay_identifier)(struct sas_rphy *);
        int (*phy_reset)(struct sas_phy *, int);
        int (*phy_enable)(struct sas_phy *, int);
        int (*set_phy_speed)(struct sas_phy *, struct sas_phy_linkrates *);
        int (*smp_handler)(struct Scsi_Host *, struct sas_rphy *, struct request *);
};


void sas_remove_children(struct device *);
extern void sas_remove_host(struct Scsi_Host *);

extern struct sas_phy *sas_phy_alloc(struct device *, int);
extern void sas_phy_free(struct sas_phy *);
extern int sas_phy_add(struct sas_phy *);
extern void sas_phy_delete(struct sas_phy *);
extern int scsi_is_sas_phy(const struct device *);

extern struct sas_rphy *sas_end_device_alloc(struct sas_port *);
extern struct sas_rphy *sas_expander_alloc(struct sas_port *, enum sas_device_type);
void sas_rphy_free(struct sas_rphy *);
extern int sas_rphy_add(struct sas_rphy *);
extern void sas_rphy_remove(struct sas_rphy *);
extern void sas_rphy_delete(struct sas_rphy *);
extern int scsi_is_sas_rphy(const struct device *);

struct sas_port *sas_port_alloc(struct device *, int);
struct sas_port *sas_port_alloc_num(struct device *);
int sas_port_add(struct sas_port *);
void sas_port_free(struct sas_port *);
void sas_port_delete(struct sas_port *);
void sas_port_add_phy(struct sas_port *, struct sas_phy *);
void sas_port_delete_phy(struct sas_port *, struct sas_phy *);
void sas_port_mark_backlink(struct sas_port *);
int scsi_is_sas_port(const struct device *);

extern struct scsi_transport_template *
sas_attach_transport(struct sas_function_template *);
extern void sas_release_transport(struct scsi_transport_template *);
int sas_read_port_mode_page(struct scsi_device *);

static inline int
scsi_is_sas_expander_device(struct device *dev)
{
        struct sas_rphy *rphy;
        if (!scsi_is_sas_rphy(dev))
                return 0;
        rphy = dev_to_rphy(dev);
        return rphy->identify.device_type == SAS_FANOUT_EXPANDER_DEVICE ||
                rphy->identify.device_type == SAS_EDGE_EXPANDER_DEVICE;
}

#define scsi_is_sas_phy_local(phy)      scsi_is_host_device((phy)->dev.parent)

#endif /* SCSI_TRANSPORT_SAS_H */