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 <asm/irq.h> 8 #include "css.h" 9 #include "orb.h" 10 11 struct io_subchannel_private { 12 union orb orb; /* operation request block */ 13 struct ccw1 sense_ccw; /* static ccw for sense command */ 14 struct ccw_device *cdev;/* pointer to the child ccw device */ 15 struct { 16 unsigned int suspend:1; /* allow suspend */ 17 unsigned int prefetch:1;/* deny prefetch */ 18 unsigned int inter:1; /* suppress intermediate interrupts */ 19 } __packed options; 20 } __aligned(8); 21 22 #define to_io_private(n) ((struct io_subchannel_private *) \ 23 dev_get_drvdata(&(n)->dev)) 24 #define set_io_private(n, p) (dev_set_drvdata(&(n)->dev, p)) 25 26 static inline struct ccw_device *sch_get_cdev(struct subchannel *sch) 27 { 28 struct io_subchannel_private *priv = to_io_private(sch); 29 return priv ? priv->cdev : NULL; 30 } 31 32 static inline void sch_set_cdev(struct subchannel *sch, 33 struct ccw_device *cdev) 34 { 35 struct io_subchannel_private *priv = to_io_private(sch); 36 if (priv) 37 priv->cdev = cdev; 38 } 39 40 #define MAX_CIWS 8 41 42 /* 43 * Possible status values for a CCW request's I/O. 44 */ 45 enum io_status { 46 IO_DONE, 47 IO_RUNNING, 48 IO_STATUS_ERROR, 49 IO_PATH_ERROR, 50 IO_REJECTED, 51 IO_KILLED 52 }; 53 54 /** 55 * ccw_request - Internal CCW request. 56 * @cp: channel program to start 57 * @timeout: maximum allowable time in jiffies between start I/O and interrupt 58 * @maxretries: number of retries per I/O operation and path 59 * @lpm: mask of paths to use 60 * @check: optional callback that determines if results are final 61 * @filter: optional callback to adjust request status based on IRB data 62 * @callback: final callback 63 * @data: user-defined pointer passed to all callbacks 64 * @singlepath: if set, use only one path from @lpm per start I/O 65 * @cancel: non-zero if request was cancelled 66 * @done: non-zero if request was finished 67 * @mask: current path mask 68 * @retries: current number of retries 69 * @drc: delayed return code 70 */ 71 struct ccw_request { 72 struct ccw1 *cp; 73 unsigned long timeout; 74 u16 maxretries; 75 u8 lpm; 76 int (*check)(struct ccw_device *, void *); 77 enum io_status (*filter)(struct ccw_device *, void *, struct irb *, 78 enum io_status); 79 void (*callback)(struct ccw_device *, void *, int); 80 void *data; 81 unsigned int singlepath:1; 82 /* These fields are used internally. */ 83 unsigned int cancel:1; 84 unsigned int done:1; 85 u16 mask; 86 u16 retries; 87 int drc; 88 } __attribute__((packed)); 89 90 /* 91 * sense-id response buffer layout 92 */ 93 struct senseid { 94 /* common part */ 95 u8 reserved; /* always 0x'FF' */ 96 u16 cu_type; /* control unit type */ 97 u8 cu_model; /* control unit model */ 98 u16 dev_type; /* device type */ 99 u8 dev_model; /* device model */ 100 u8 unused; /* padding byte */ 101 /* extended part */ 102 struct ciw ciw[MAX_CIWS]; /* variable # of CIWs */ 103 } __attribute__ ((packed, aligned(4))); 104 105 enum cdev_todo { 106 CDEV_TODO_NOTHING, 107 CDEV_TODO_ENABLE_CMF, 108 CDEV_TODO_REBIND, 109 CDEV_TODO_REGISTER, 110 CDEV_TODO_UNREG, 111 CDEV_TODO_UNREG_EVAL, 112 }; 113 114 #define FAKE_CMD_IRB 1 115 #define FAKE_TM_IRB 2 116 117 struct ccw_device_private { 118 struct ccw_device *cdev; 119 struct subchannel *sch; 120 int state; /* device state */ 121 atomic_t onoff; 122 struct ccw_dev_id dev_id; /* device id */ 123 struct subchannel_id schid; /* subchannel number */ 124 struct ccw_request req; /* internal I/O request */ 125 int iretry; 126 u8 pgid_valid_mask; /* mask of valid PGIDs */ 127 u8 pgid_todo_mask; /* mask of PGIDs to be adjusted */ 128 u8 pgid_reset_mask; /* mask of PGIDs which were reset */ 129 u8 path_gone_mask; /* mask of paths, that became unavailable */ 130 u8 path_new_mask; /* mask of paths, that became available */ 131 struct { 132 unsigned int fast:1; /* post with "channel end" */ 133 unsigned int repall:1; /* report every interrupt status */ 134 unsigned int pgroup:1; /* do path grouping */ 135 unsigned int force:1; /* allow forced online */ 136 unsigned int mpath:1; /* do multipathing */ 137 } __attribute__ ((packed)) options; 138 struct { 139 unsigned int esid:1; /* Ext. SenseID supported by HW */ 140 unsigned int dosense:1; /* delayed SENSE required */ 141 unsigned int doverify:1; /* delayed path verification */ 142 unsigned int donotify:1; /* call notify function */ 143 unsigned int recog_done:1; /* dev. recog. complete */ 144 unsigned int fake_irb:2; /* deliver faked irb */ 145 unsigned int resuming:1; /* recognition while resume */ 146 unsigned int pgroup:1; /* pathgroup is set up */ 147 unsigned int mpath:1; /* multipathing is set up */ 148 unsigned int initialized:1; /* set if initial reference held */ 149 } __attribute__((packed)) flags; 150 unsigned long intparm; /* user interruption parameter */ 151 struct qdio_irq *qdio_data; 152 struct irb irb; /* device status */ 153 struct senseid senseid; /* SenseID info */ 154 struct pgid pgid[8]; /* path group IDs per chpid*/ 155 struct ccw1 iccws[2]; /* ccws for SNID/SID/SPGID commands */ 156 struct work_struct todo_work; 157 enum cdev_todo todo; 158 wait_queue_head_t wait_q; 159 struct timer_list timer; 160 void *cmb; /* measurement information */ 161 struct list_head cmb_list; /* list of measured devices */ 162 u64 cmb_start_time; /* clock value of cmb reset */ 163 void *cmb_wait; /* deferred cmb enable/disable */ 164 enum interruption_class int_class; 165 }; 166 167 static inline int rsch(struct subchannel_id schid) 168 { 169 register struct subchannel_id reg1 asm("1") = schid; 170 int ccode; 171 172 asm volatile( 173 " rsch\n" 174 " ipm %0\n" 175 " srl %0,28" 176 : "=d" (ccode) 177 : "d" (reg1) 178 : "cc", "memory"); 179 return ccode; 180 } 181 182 static inline int hsch(struct subchannel_id schid) 183 { 184 register struct subchannel_id reg1 asm("1") = schid; 185 int ccode; 186 187 asm volatile( 188 " hsch\n" 189 " ipm %0\n" 190 " srl %0,28" 191 : "=d" (ccode) 192 : "d" (reg1) 193 : "cc"); 194 return ccode; 195 } 196 197 static inline int xsch(struct subchannel_id schid) 198 { 199 register struct subchannel_id reg1 asm("1") = schid; 200 int ccode; 201 202 asm volatile( 203 " .insn rre,0xb2760000,%1,0\n" 204 " ipm %0\n" 205 " srl %0,28" 206 : "=d" (ccode) 207 : "d" (reg1) 208 : "cc"); 209 return ccode; 210 } 211 212 #endif 213