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Linux/include/scsi/scsi_transport_sas.h

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  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 #include <scsi/sas.h>
  8 
  9 struct scsi_transport_template;
 10 struct sas_rphy;
 11 struct request;
 12 
 13 #if !IS_ENABLED(CONFIG_SCSI_SAS_ATTRS)
 14 static inline int scsi_is_sas_rphy(const struct device *sdev)
 15 {
 16         return 0;
 17 }
 18 #else
 19 extern int scsi_is_sas_rphy(const struct device *);
 20 #endif
 21 
 22 static inline int sas_protocol_ata(enum sas_protocol proto)
 23 {
 24         return ((proto & SAS_PROTOCOL_SATA) ||
 25                 (proto & SAS_PROTOCOL_STP))? 1 : 0;
 26 }
 27 
 28 enum sas_linkrate {
 29         /* These Values are defined in the SAS standard */
 30         SAS_LINK_RATE_UNKNOWN = 0,
 31         SAS_PHY_DISABLED = 1,
 32         SAS_PHY_RESET_PROBLEM = 2,
 33         SAS_SATA_SPINUP_HOLD = 3,
 34         SAS_SATA_PORT_SELECTOR = 4,
 35         SAS_PHY_RESET_IN_PROGRESS = 5,
 36         SAS_LINK_RATE_1_5_GBPS = 8,
 37         SAS_LINK_RATE_G1 = SAS_LINK_RATE_1_5_GBPS,
 38         SAS_LINK_RATE_3_0_GBPS = 9,
 39         SAS_LINK_RATE_G2 = SAS_LINK_RATE_3_0_GBPS,
 40         SAS_LINK_RATE_6_0_GBPS = 10,
 41         SAS_LINK_RATE_12_0_GBPS = 11,
 42         /* These are virtual to the transport class and may never
 43          * be signalled normally since the standard defined field
 44          * is only 4 bits */
 45         SAS_LINK_RATE_FAILED = 0x10,
 46         SAS_PHY_VIRTUAL = 0x11,
 47 };
 48 
 49 struct sas_identify {
 50         enum sas_device_type    device_type;
 51         enum sas_protocol       initiator_port_protocols;
 52         enum sas_protocol       target_port_protocols;
 53         u64                     sas_address;
 54         u8                      phy_identifier;
 55 };
 56 
 57 struct sas_phy {
 58         struct device           dev;
 59         int                     number;
 60         int                     enabled;
 61 
 62         /* phy identification */
 63         struct sas_identify     identify;
 64 
 65         /* phy attributes */
 66         enum sas_linkrate       negotiated_linkrate;
 67         enum sas_linkrate       minimum_linkrate_hw;
 68         enum sas_linkrate       minimum_linkrate;
 69         enum sas_linkrate       maximum_linkrate_hw;
 70         enum sas_linkrate       maximum_linkrate;
 71 
 72         /* link error statistics */
 73         u32                     invalid_dword_count;
 74         u32                     running_disparity_error_count;
 75         u32                     loss_of_dword_sync_count;
 76         u32                     phy_reset_problem_count;
 77 
 78         /* for the list of phys belonging to a port */
 79         struct list_head        port_siblings;
 80 
 81         /* available to the lldd */
 82         void                    *hostdata;
 83 };
 84 
 85 #define dev_to_phy(d) \
 86         container_of((d), struct sas_phy, dev)
 87 #define transport_class_to_phy(dev) \
 88         dev_to_phy((dev)->parent)
 89 #define phy_to_shost(phy) \
 90         dev_to_shost((phy)->dev.parent)
 91 
 92 struct request_queue;
 93 struct sas_rphy {
 94         struct device           dev;
 95         struct sas_identify     identify;
 96         struct list_head        list;
 97         struct request_queue    *q;
 98         u32                     scsi_target_id;
 99 };
100 
101 #define dev_to_rphy(d) \
102         container_of((d), struct sas_rphy, dev)
103 #define transport_class_to_rphy(dev) \
104         dev_to_rphy((dev)->parent)
105 #define rphy_to_shost(rphy) \
106         dev_to_shost((rphy)->dev.parent)
107 #define target_to_rphy(targ) \
108         dev_to_rphy((targ)->dev.parent)
109 
110 struct sas_end_device {
111         struct sas_rphy         rphy;
112         /* flags */
113         unsigned                ready_led_meaning:1;
114         unsigned                tlr_supported:1;
115         unsigned                tlr_enabled: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(dev) \
162         dev_to_sas_port((dev)->parent)
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 (*phy_setup)(struct sas_phy *);
177         void (*phy_release)(struct sas_phy *);
178         int (*set_phy_speed)(struct sas_phy *, struct sas_phy_linkrates *);
179         int (*smp_handler)(struct Scsi_Host *, struct sas_rphy *, struct request *);
180 };
181 
182 
183 void sas_remove_children(struct device *);
184 extern void sas_remove_host(struct Scsi_Host *);
185 
186 extern struct sas_phy *sas_phy_alloc(struct device *, int);
187 extern void sas_phy_free(struct sas_phy *);
188 extern int sas_phy_add(struct sas_phy *);
189 extern void sas_phy_delete(struct sas_phy *);
190 extern int scsi_is_sas_phy(const struct device *);
191 
192 u64 sas_get_address(struct scsi_device *);
193 unsigned int sas_tlr_supported(struct scsi_device *);
194 unsigned int sas_is_tlr_enabled(struct scsi_device *);
195 void sas_disable_tlr(struct scsi_device *);
196 void sas_enable_tlr(struct scsi_device *);
197 
198 extern struct sas_rphy *sas_end_device_alloc(struct sas_port *);
199 extern struct sas_rphy *sas_expander_alloc(struct sas_port *, enum sas_device_type);
200 void sas_rphy_free(struct sas_rphy *);
201 extern int sas_rphy_add(struct sas_rphy *);
202 extern void sas_rphy_remove(struct sas_rphy *);
203 extern void sas_rphy_delete(struct sas_rphy *);
204 extern void sas_rphy_unlink(struct sas_rphy *);
205 
206 struct sas_port *sas_port_alloc(struct device *, int);
207 struct sas_port *sas_port_alloc_num(struct device *);
208 int sas_port_add(struct sas_port *);
209 void sas_port_free(struct sas_port *);
210 void sas_port_delete(struct sas_port *);
211 void sas_port_add_phy(struct sas_port *, struct sas_phy *);
212 void sas_port_delete_phy(struct sas_port *, struct sas_phy *);
213 void sas_port_mark_backlink(struct sas_port *);
214 int scsi_is_sas_port(const struct device *);
215 struct sas_phy *sas_port_get_phy(struct sas_port *port);
216 static inline void sas_port_put_phy(struct sas_phy *phy)
217 {
218         if (phy)
219                 put_device(&phy->dev);
220 }
221 
222 extern struct scsi_transport_template *
223 sas_attach_transport(struct sas_function_template *);
224 extern void sas_release_transport(struct scsi_transport_template *);
225 int sas_read_port_mode_page(struct scsi_device *);
226 
227 static inline int
228 scsi_is_sas_expander_device(struct device *dev)
229 {
230         struct sas_rphy *rphy;
231         if (!scsi_is_sas_rphy(dev))
232                 return 0;
233         rphy = dev_to_rphy(dev);
234         return rphy->identify.device_type == SAS_FANOUT_EXPANDER_DEVICE ||
235                 rphy->identify.device_type == SAS_EDGE_EXPANDER_DEVICE;
236 }
237 
238 #define scsi_is_sas_phy_local(phy)      scsi_is_host_device((phy)->dev.parent)
239 
240 #endif /* SCSI_TRANSPORT_SAS_H */
241 

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