1 #ifndef S390_IO_SCH_H 2 #define S390_IO_SCH_H 3 4 #include <linux/types.h> 5 #include <asm/schid.h> 6 #include <asm/ccwdev.h> 7 #include "css.h" 8 #include "orb.h" 9 10 struct io_subchannel_private { 11 union orb orb; /* operation request block */ 12 struct ccw1 sense_ccw; /* static ccw for sense command */ 13 struct ccw_device *cdev;/* pointer to the child ccw device */ 14 struct { 15 unsigned int suspend:1; /* allow suspend */ 16 unsigned int prefetch:1;/* deny prefetch */ 17 unsigned int inter:1; /* suppress intermediate interrupts */ 18 } __packed options; 19 } __aligned(8); 20 21 #define to_io_private(n) ((struct io_subchannel_private *) \ 22 dev_get_drvdata(&(n)->dev)) 23 #define set_io_private(n, p) (dev_set_drvdata(&(n)->dev, p)) 24 25 static inline struct ccw_device *sch_get_cdev(struct subchannel *sch) 26 { 27 struct io_subchannel_private *priv = to_io_private(sch); 28 return priv ? priv->cdev : NULL; 29 } 30 31 static inline void sch_set_cdev(struct subchannel *sch, 32 struct ccw_device *cdev) 33 { 34 struct io_subchannel_private *priv = to_io_private(sch); 35 if (priv) 36 priv->cdev = cdev; 37 } 38 39 #define MAX_CIWS 8 40 41 /* 42 * Possible status values for a CCW request's I/O. 43 */ 44 enum io_status { 45 IO_DONE, 46 IO_RUNNING, 47 IO_STATUS_ERROR, 48 IO_PATH_ERROR, 49 IO_REJECTED, 50 IO_KILLED 51 }; 52 53 /** 54 * ccw_request - Internal CCW request. 55 * @cp: channel program to start 56 * @timeout: maximum allowable time in jiffies between start I/O and interrupt 57 * @maxretries: number of retries per I/O operation and path 58 * @lpm: mask of paths to use 59 * @check: optional callback that determines if results are final 60 * @filter: optional callback to adjust request status based on IRB data 61 * @callback: final callback 62 * @data: user-defined pointer passed to all callbacks 63 * @singlepath: if set, use only one path from @lpm per start I/O 64 * @cancel: non-zero if request was cancelled 65 * @done: non-zero if request was finished 66 * @mask: current path mask 67 * @retries: current number of retries 68 * @drc: delayed return code 69 */ 70 struct ccw_request { 71 struct ccw1 *cp; 72 unsigned long timeout; 73 u16 maxretries; 74 u8 lpm; 75 int (*check)(struct ccw_device *, void *); 76 enum io_status (*filter)(struct ccw_device *, void *, struct irb *, 77 enum io_status); 78 void (*callback)(struct ccw_device *, void *, int); 79 void *data; 80 unsigned int singlepath:1; 81 /* These fields are used internally. */ 82 unsigned int cancel:1; 83 unsigned int done:1; 84 u16 mask; 85 u16 retries; 86 int drc; 87 } __attribute__((packed)); 88 89 /* 90 * sense-id response buffer layout 91 */ 92 struct senseid { 93 /* common part */ 94 u8 reserved; /* always 0x'FF' */ 95 u16 cu_type; /* control unit type */ 96 u8 cu_model; /* control unit model */ 97 u16 dev_type; /* device type */ 98 u8 dev_model; /* device model */ 99 u8 unused; /* padding byte */ 100 /* extended part */ 101 struct ciw ciw[MAX_CIWS]; /* variable # of CIWs */ 102 } __attribute__ ((packed, aligned(4))); 103 104 enum cdev_todo { 105 CDEV_TODO_NOTHING, 106 CDEV_TODO_ENABLE_CMF, 107 CDEV_TODO_REBIND, 108 CDEV_TODO_REGISTER, 109 CDEV_TODO_UNREG, 110 CDEV_TODO_UNREG_EVAL, 111 }; 112 113 struct ccw_device_private { 114 struct ccw_device *cdev; 115 struct subchannel *sch; 116 int state; /* device state */ 117 atomic_t onoff; 118 struct ccw_dev_id dev_id; /* device id */ 119 struct subchannel_id schid; /* subchannel number */ 120 struct ccw_request req; /* internal I/O request */ 121 int iretry; 122 u8 pgid_valid_mask; /* mask of valid PGIDs */ 123 u8 pgid_todo_mask; /* mask of PGIDs to be adjusted */ 124 u8 pgid_reset_mask; /* mask of PGIDs which were reset */ 125 u8 path_gone_mask; /* mask of paths, that became unavailable */ 126 u8 path_new_mask; /* mask of paths, that became available */ 127 struct { 128 unsigned int fast:1; /* post with "channel end" */ 129 unsigned int repall:1; /* report every interrupt status */ 130 unsigned int pgroup:1; /* do path grouping */ 131 unsigned int force:1; /* allow forced online */ 132 unsigned int mpath:1; /* do multipathing */ 133 } __attribute__ ((packed)) options; 134 struct { 135 unsigned int esid:1; /* Ext. SenseID supported by HW */ 136 unsigned int dosense:1; /* delayed SENSE required */ 137 unsigned int doverify:1; /* delayed path verification */ 138 unsigned int donotify:1; /* call notify function */ 139 unsigned int recog_done:1; /* dev. recog. complete */ 140 unsigned int fake_irb:1; /* deliver faked irb */ 141 unsigned int resuming:1; /* recognition while resume */ 142 unsigned int pgroup:1; /* pathgroup is set up */ 143 unsigned int mpath:1; /* multipathing is set up */ 144 unsigned int initialized:1; /* set if initial reference held */ 145 } __attribute__((packed)) flags; 146 unsigned long intparm; /* user interruption parameter */ 147 struct qdio_irq *qdio_data; 148 struct irb irb; /* device status */ 149 struct senseid senseid; /* SenseID info */ 150 struct pgid pgid[8]; /* path group IDs per chpid*/ 151 struct ccw1 iccws[2]; /* ccws for SNID/SID/SPGID commands */ 152 struct work_struct todo_work; 153 enum cdev_todo todo; 154 wait_queue_head_t wait_q; 155 struct timer_list timer; 156 void *cmb; /* measurement information */ 157 struct list_head cmb_list; /* list of measured devices */ 158 u64 cmb_start_time; /* clock value of cmb reset */ 159 void *cmb_wait; /* deferred cmb enable/disable */ 160 }; 161 162 static inline int rsch(struct subchannel_id schid) 163 { 164 register struct subchannel_id reg1 asm("1") = schid; 165 int ccode; 166 167 asm volatile( 168 " rsch\n" 169 " ipm %0\n" 170 " srl %0,28" 171 : "=d" (ccode) 172 : "d" (reg1) 173 : "cc", "memory"); 174 return ccode; 175 } 176 177 static inline int hsch(struct subchannel_id schid) 178 { 179 register struct subchannel_id reg1 asm("1") = schid; 180 int ccode; 181 182 asm volatile( 183 " hsch\n" 184 " ipm %0\n" 185 " srl %0,28" 186 : "=d" (ccode) 187 : "d" (reg1) 188 : "cc"); 189 return ccode; 190 } 191 192 static inline int xsch(struct subchannel_id schid) 193 { 194 register struct subchannel_id reg1 asm("1") = schid; 195 int ccode; 196 197 asm volatile( 198 " .insn rre,0xb2760000,%1,0\n" 199 " ipm %0\n" 200 " srl %0,28" 201 : "=d" (ccode) 202 : "d" (reg1) 203 : "cc"); 204 return ccode; 205 } 206 207 #endif 208