1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef S390_IO_SCH_H 3 #define S390_IO_SCH_H 4 5 #include <linux/types.h> 6 #include <asm/schid.h> 7 #include <asm/ccwdev.h> 8 #include <asm/irq.h> 9 #include "css.h" 10 #include "orb.h" 11 12 struct io_subchannel_private { 13 union orb orb; /* operation request block */ 14 struct ccw1 sense_ccw; /* static ccw for sense command */ 15 struct ccw_device *cdev;/* pointer to the child ccw device */ 16 struct { 17 unsigned int suspend:1; /* allow suspend */ 18 unsigned int prefetch:1;/* deny prefetch */ 19 unsigned int inter:1; /* suppress intermediate interrupts */ 20 } __packed options; 21 } __aligned(8); 22 23 #define to_io_private(n) ((struct io_subchannel_private *) \ 24 dev_get_drvdata(&(n)->dev)) 25 #define set_io_private(n, p) (dev_set_drvdata(&(n)->dev, p)) 26 27 static inline struct ccw_device *sch_get_cdev(struct subchannel *sch) 28 { 29 struct io_subchannel_private *priv = to_io_private(sch); 30 return priv ? priv->cdev : NULL; 31 } 32 33 static inline void sch_set_cdev(struct subchannel *sch, 34 struct ccw_device *cdev) 35 { 36 struct io_subchannel_private *priv = to_io_private(sch); 37 if (priv) 38 priv->cdev = cdev; 39 } 40 41 #define MAX_CIWS 8 42 43 /* 44 * Possible status values for a CCW request's I/O. 45 */ 46 enum io_status { 47 IO_DONE, 48 IO_RUNNING, 49 IO_STATUS_ERROR, 50 IO_PATH_ERROR, 51 IO_REJECTED, 52 IO_KILLED 53 }; 54 55 /** 56 * ccw_request - Internal CCW request. 57 * @cp: channel program to start 58 * @timeout: maximum allowable time in jiffies between start I/O and interrupt 59 * @maxretries: number of retries per I/O operation and path 60 * @lpm: mask of paths to use 61 * @check: optional callback that determines if results are final 62 * @filter: optional callback to adjust request status based on IRB data 63 * @callback: final callback 64 * @data: user-defined pointer passed to all callbacks 65 * @singlepath: if set, use only one path from @lpm per start I/O 66 * @cancel: non-zero if request was cancelled 67 * @done: non-zero if request was finished 68 * @mask: current path mask 69 * @retries: current number of retries 70 * @drc: delayed return code 71 */ 72 struct ccw_request { 73 struct ccw1 *cp; 74 unsigned long timeout; 75 u16 maxretries; 76 u8 lpm; 77 int (*check)(struct ccw_device *, void *); 78 enum io_status (*filter)(struct ccw_device *, void *, struct irb *, 79 enum io_status); 80 void (*callback)(struct ccw_device *, void *, int); 81 void *data; 82 unsigned int singlepath:1; 83 /* These fields are used internally. */ 84 unsigned int cancel:1; 85 unsigned int done:1; 86 u16 mask; 87 u16 retries; 88 int drc; 89 } __attribute__((packed)); 90 91 /* 92 * sense-id response buffer layout 93 */ 94 struct senseid { 95 /* common part */ 96 u8 reserved; /* always 0x'FF' */ 97 u16 cu_type; /* control unit type */ 98 u8 cu_model; /* control unit model */ 99 u16 dev_type; /* device type */ 100 u8 dev_model; /* device model */ 101 u8 unused; /* padding byte */ 102 /* extended part */ 103 struct ciw ciw[MAX_CIWS]; /* variable # of CIWs */ 104 } __attribute__ ((packed, aligned(4))); 105 106 enum cdev_todo { 107 CDEV_TODO_NOTHING, 108 CDEV_TODO_ENABLE_CMF, 109 CDEV_TODO_REBIND, 110 CDEV_TODO_REGISTER, 111 CDEV_TODO_UNREG, 112 CDEV_TODO_UNREG_EVAL, 113 }; 114 115 #define FAKE_CMD_IRB 1 116 #define FAKE_TM_IRB 2 117 118 struct ccw_device_private { 119 struct ccw_device *cdev; 120 struct subchannel *sch; 121 int state; /* device state */ 122 atomic_t onoff; 123 struct ccw_dev_id dev_id; /* device id */ 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 u8 path_broken_mask; /* mask of paths, which were found to be 136 unusable */ 137 struct { 138 unsigned int fast:1; /* post with "channel end" */ 139 unsigned int repall:1; /* report every interrupt status */ 140 unsigned int pgroup:1; /* do path grouping */ 141 unsigned int force:1; /* allow forced online */ 142 unsigned int mpath:1; /* do multipathing */ 143 } __attribute__ ((packed)) options; 144 struct { 145 unsigned int esid:1; /* Ext. SenseID supported by HW */ 146 unsigned int dosense:1; /* delayed SENSE required */ 147 unsigned int doverify:1; /* delayed path verification */ 148 unsigned int donotify:1; /* call notify function */ 149 unsigned int recog_done:1; /* dev. recog. complete */ 150 unsigned int fake_irb:2; /* deliver faked irb */ 151 unsigned int resuming:1; /* recognition while resume */ 152 unsigned int pgroup:1; /* pathgroup is set up */ 153 unsigned int mpath:1; /* multipathing is set up */ 154 unsigned int pgid_unknown:1;/* unknown pgid state */ 155 unsigned int initialized:1; /* set if initial reference held */ 156 } __attribute__((packed)) flags; 157 unsigned long intparm; /* user interruption parameter */ 158 struct qdio_irq *qdio_data; 159 struct irb irb; /* device status */ 160 int async_kill_io_rc; 161 struct senseid senseid; /* SenseID info */ 162 struct pgid pgid[8]; /* path group IDs per chpid*/ 163 struct ccw1 iccws[2]; /* ccws for SNID/SID/SPGID commands */ 164 struct work_struct todo_work; 165 enum cdev_todo todo; 166 wait_queue_head_t wait_q; 167 struct timer_list timer; 168 void *cmb; /* measurement information */ 169 struct list_head cmb_list; /* list of measured devices */ 170 u64 cmb_start_time; /* clock value of cmb reset */ 171 void *cmb_wait; /* deferred cmb enable/disable */ 172 enum interruption_class int_class; 173 }; 174 175 #endif 176