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 11struct 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 26static 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 32static 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 */ 45enum 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 */ 71struct 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 */ 93struct 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 105enum 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 117struct 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_noirq_mask; /* mask of paths for which no irq was 130 received */ 131 u8 path_notoper_mask; /* mask of paths which were found 132 not operable */ 133 u8 path_gone_mask; /* mask of paths, that became unavailable */ 134 u8 path_new_mask; /* mask of paths, that became available */ 135 struct { 136 unsigned int fast:1; /* post with "channel end" */ 137 unsigned int repall:1; /* report every interrupt status */ 138 unsigned int pgroup:1; /* do path grouping */ 139 unsigned int force:1; /* allow forced online */ 140 unsigned int mpath:1; /* do multipathing */ 141 } __attribute__ ((packed)) options; 142 struct { 143 unsigned int esid:1; /* Ext. SenseID supported by HW */ 144 unsigned int dosense:1; /* delayed SENSE required */ 145 unsigned int doverify:1; /* delayed path verification */ 146 unsigned int donotify:1; /* call notify function */ 147 unsigned int recog_done:1; /* dev. recog. complete */ 148 unsigned int fake_irb:2; /* deliver faked irb */ 149 unsigned int resuming:1; /* recognition while resume */ 150 unsigned int pgroup:1; /* pathgroup is set up */ 151 unsigned int mpath:1; /* multipathing is set up */ 152 unsigned int pgid_unknown:1;/* unknown pgid state */ 153 unsigned int initialized:1; /* set if initial reference held */ 154 } __attribute__((packed)) flags; 155 unsigned long intparm; /* user interruption parameter */ 156 struct qdio_irq *qdio_data; 157 struct irb irb; /* device status */ 158 struct senseid senseid; /* SenseID info */ 159 struct pgid pgid[8]; /* path group IDs per chpid*/ 160 struct ccw1 iccws[2]; /* ccws for SNID/SID/SPGID commands */ 161 struct work_struct todo_work; 162 enum cdev_todo todo; 163 wait_queue_head_t wait_q; 164 struct timer_list timer; 165 void *cmb; /* measurement information */ 166 struct list_head cmb_list; /* list of measured devices */ 167 u64 cmb_start_time; /* clock value of cmb reset */ 168 void *cmb_wait; /* deferred cmb enable/disable */ 169 enum interruption_class int_class; 170}; 171 172static inline int rsch(struct subchannel_id schid) 173{ 174 register struct subchannel_id reg1 asm("1") = schid; 175 int ccode; 176 177 asm volatile( 178 " rsch\n" 179 " ipm %0\n" 180 " srl %0,28" 181 : "=d" (ccode) 182 : "d" (reg1) 183 : "cc", "memory"); 184 return ccode; 185} 186 187static inline int hsch(struct subchannel_id schid) 188{ 189 register struct subchannel_id reg1 asm("1") = schid; 190 int ccode; 191 192 asm volatile( 193 " hsch\n" 194 " ipm %0\n" 195 " srl %0,28" 196 : "=d" (ccode) 197 : "d" (reg1) 198 : "cc"); 199 return ccode; 200} 201 202static inline int xsch(struct subchannel_id schid) 203{ 204 register struct subchannel_id reg1 asm("1") = schid; 205 int ccode; 206 207 asm volatile( 208 " .insn rre,0xb2760000,%1,0\n" 209 " ipm %0\n" 210 " srl %0,28" 211 : "=d" (ccode) 212 : "d" (reg1) 213 : "cc"); 214 return ccode; 215} 216 217#endif 218