include/scsi/scsi_transport_sas.h

   1 #ifndef SCSI_TRANSPORT_SAS_H
   2 #define SCSI_TRANSPORT_SAS_H
   3
   4 #include <linux/transport_class.h>
   5 #include <linux/types.h>
   6 #include <linux/mutex.h>
   7
   8 struct scsi_transport_template;
   9 struct sas_rphy;
  10 struct request;
  11
  12 enum sas_device_type {
  13         SAS_PHY_UNUSED,
  14         SAS_END_DEVICE,
  15         SAS_EDGE_EXPANDER_DEVICE,
  16         SAS_FANOUT_EXPANDER_DEVICE,
  17 };
  18
  19 enum sas_protocol {
  20         SAS_PROTOCOL_SATA               = 0x01,
  21         SAS_PROTOCOL_SMP                = 0x02,
  22         SAS_PROTOCOL_STP                = 0x04,
  23         SAS_PROTOCOL_SSP                = 0x08,
  24 };
  25
  26 static inline int sas_protocol_ata(enum sas_protocol proto)
  27 {
  28         return ((proto & SAS_PROTOCOL_SATA) ||
  29                 (proto & SAS_PROTOCOL_STP))? 1 : 0;
  30 }
  31
  32 enum sas_linkrate {
  33         /* These Values are defined in the SAS standard */
  34         SAS_LINK_RATE_UNKNOWN = 0,
  35         SAS_PHY_DISABLED = 1,
  36         SAS_PHY_RESET_PROBLEM = 2,
  37         SAS_SATA_SPINUP_HOLD = 3,
  38         SAS_SATA_PORT_SELECTOR = 4,
  39         SAS_PHY_RESET_IN_PROGRESS = 5,
  40         SAS_LINK_RATE_1_5_GBPS = 8,
  41         SAS_LINK_RATE_G1 = SAS_LINK_RATE_1_5_GBPS,
  42         SAS_LINK_RATE_3_0_GBPS = 9,
  43         SAS_LINK_RATE_G2 = SAS_LINK_RATE_3_0_GBPS,
  44         SAS_LINK_RATE_6_0_GBPS = 10,
  45         /* These are virtual to the transport class and may never
  46          * be signalled normally since the standard defined field
  47          * is only 4 bits */
  48         SAS_LINK_RATE_FAILED = 0x10,
  49         SAS_PHY_VIRTUAL = 0x11,
  50 };
  51
  52 struct sas_identify {
  53         enum sas_device_type    device_type;
  54         enum sas_protocol       initiator_port_protocols;
  55         enum sas_protocol       target_port_protocols;
  56         u64                     sas_address;
  57         u8                      phy_identifier;
  58 };
  59
  60 struct sas_phy {
  61         struct device           dev;
  62         int                     number;
  63         int                     enabled;
  64
  65         /* phy identification */
  66         struct sas_identify     identify;
  67
  68         /* phy attributes */
  69         enum sas_linkrate       negotiated_linkrate;
  70         enum sas_linkrate       minimum_linkrate_hw;
  71         enum sas_linkrate       minimum_linkrate;
  72         enum sas_linkrate       maximum_linkrate_hw;
  73         enum sas_linkrate       maximum_linkrate;
  74
  75         /* link error statistics */
  76         u32                     invalid_dword_count;
  77         u32                     running_disparity_error_count;
  78         u32                     loss_of_dword_sync_count;
  79         u32                     phy_reset_problem_count;
  80
  81         /* for the list of phys belonging to a port */
  82         struct list_head        port_siblings;
  83
  84         struct work_struct      reset_work;
  85 };
  86
  87 #define dev_to_phy(d) \
  88         container_of((d), struct sas_phy, dev)
  89 #define transport_class_to_phy(cdev) \
  90         dev_to_phy((cdev)->dev)
  91 #define phy_to_shost(phy) \
  92         dev_to_shost((phy)->dev.parent)
  93
  94 struct request_queue;
  95 struct sas_rphy {
  96         struct device           dev;
  97         struct sas_identify     identify;
  98         struct list_head        list;
  99         struct request_queue    *q;
 100         u32                     scsi_target_id;
 101 };
 102
 103 #define dev_to_rphy(d) \
 104         container_of((d), struct sas_rphy, dev)
 105 #define transport_class_to_rphy(cdev) \
 106         dev_to_rphy((cdev)->dev)
 107 #define rphy_to_shost(rphy) \
 108         dev_to_shost((rphy)->dev.parent)
 109 #define target_to_rphy(targ) \
 110         dev_to_rphy((targ)->dev.parent)
 111
 112 struct sas_end_device {
 113         struct sas_rphy         rphy;
 114         /* flags */
 115         unsigned                ready_led_meaning:1;
 116         /* parameters */
 117         u16                     I_T_nexus_loss_timeout;
 118         u16                     initiator_response_timeout;
 119 };
 120 #define rphy_to_end_device(r) \
 121         container_of((r), struct sas_end_device, rphy)
 122
 123 struct sas_expander_device {
 124         int    level;
 125         int    next_port_id;
 126
 127         #define SAS_EXPANDER_VENDOR_ID_LEN      8
 128         char   vendor_id[SAS_EXPANDER_VENDOR_ID_LEN+1];
 129         #define SAS_EXPANDER_PRODUCT_ID_LEN     16
 130         char   product_id[SAS_EXPANDER_PRODUCT_ID_LEN+1];
 131         #define SAS_EXPANDER_PRODUCT_REV_LEN    4
 132         char   product_rev[SAS_EXPANDER_PRODUCT_REV_LEN+1];
 133         #define SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN    8
 134         char   component_vendor_id[SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN+1];
 135         u16    component_id;
 136         u8     component_revision_id;
 137
 138         struct sas_rphy         rphy;
 139
 140 };
 141 #define rphy_to_expander_device(r) \
 142         container_of((r), struct sas_expander_device, rphy)
 143
 144 struct sas_port {
 145         struct device           dev;
 146
 147         int                     port_identifier;
 148         int                     num_phys;
 149         /* port flags */
 150         unsigned int            is_backlink:1;
 151
 152         /* the other end of the link */
 153         struct sas_rphy         *rphy;
 154
 155         struct mutex            phy_list_mutex;
 156         struct list_head        phy_list;
 157 };
 158
 159 #define dev_to_sas_port(d) \
 160         container_of((d), struct sas_port, dev)
 161 #define transport_class_to_sas_port(cdev) \
 162         dev_to_sas_port((cdev)->dev)
 163
 164 struct sas_phy_linkrates {
 165         enum sas_linkrate maximum_linkrate;
 166         enum sas_linkrate minimum_linkrate;
 167 };
 168
 169 /* The functions by which the transport class and the driver communicate */
 170 struct sas_function_template {
 171         int (*get_linkerrors)(struct sas_phy *);
 172         int (*get_enclosure_identifier)(struct sas_rphy *, u64 *);
 173         int (*get_bay_identifier)(struct sas_rphy *);
 174         int (*phy_reset)(struct sas_phy *, int);
 175         int (*phy_enable)(struct sas_phy *, int);
 176         int (*set_phy_speed)(struct sas_phy *, struct sas_phy_linkrates *);
 177         int (*smp_handler)(struct Scsi_Host *, struct sas_rphy *, struct request *);
 178 };
 179
 180
 181 void sas_remove_children(struct device *);
 182 extern void sas_remove_host(struct Scsi_Host *);
 183
 184 extern struct sas_phy *sas_phy_alloc(struct device *, int);
 185 extern void sas_phy_free(struct sas_phy *);
 186 extern int sas_phy_add(struct sas_phy *);
 187 extern void sas_phy_delete(struct sas_phy *);
 188 extern int scsi_is_sas_phy(const struct device *);
 189
 190 extern struct sas_rphy *sas_end_device_alloc(struct sas_port *);
 191 extern struct sas_rphy *sas_expander_alloc(struct sas_port *, enum sas_device_type);
 192 void sas_rphy_free(struct sas_rphy *);
 193 extern int sas_rphy_add(struct sas_rphy *);
 194 extern void sas_rphy_remove(struct sas_rphy *);
 195 extern void sas_rphy_delete(struct sas_rphy *);
 196 extern int scsi_is_sas_rphy(const struct device *);
 197
 198 struct sas_port *sas_port_alloc(struct device *, int);
 199 struct sas_port *sas_port_alloc_num(struct device *);
 200 int sas_port_add(struct sas_port *);
 201 void sas_port_free(struct sas_port *);
 202 void sas_port_delete(struct sas_port *);
 203 void sas_port_add_phy(struct sas_port *, struct sas_phy *);
 204 void sas_port_delete_phy(struct sas_port *, struct sas_phy *);
 205 void sas_port_mark_backlink(struct sas_port *);
 206 int scsi_is_sas_port(const struct device *);
 207
 208 extern struct scsi_transport_template *
 209 sas_attach_transport(struct sas_function_template *);
 210 extern void sas_release_transport(struct scsi_transport_template *);
 211 int sas_read_port_mode_page(struct scsi_device *);
 212
 213 static inline int
 214 scsi_is_sas_expander_device(struct device *dev)
 215 {
 216         struct sas_rphy *rphy;
 217         if (!scsi_is_sas_rphy(dev))
 218                 return 0;
 219         rphy = dev_to_rphy(dev);
 220         return rphy->identify.device_type == SAS_FANOUT_EXPANDER_DEVICE ||
 221                 rphy->identify.device_type == SAS_EDGE_EXPANDER_DEVICE;
 222 }
 223
 224 #define scsi_is_sas_phy_local(phy)      scsi_is_host_device((phy)->dev.parent)
 225
 226 #endif /* SCSI_TRANSPORT_SAS_H */