1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef S390_CIO_H 3 #define S390_CIO_H 4 5 #include <linux/mutex.h> 6 #include <linux/device.h> 7 #include <linux/mod_devicetable.h> 8 #include <asm/chpid.h> 9 #include <asm/cio.h> 10 #include <asm/fcx.h> 11 #include <asm/schid.h> 12 #include <asm/tpi.h> 13 #include "chsc.h" 14 15 /* 16 * path management control word 17 */ 18 struct pmcw { 19 u32 intparm; /* interruption parameter */ 20 u32 qf : 1; /* qdio facility */ 21 u32 w : 1; 22 u32 isc : 3; /* interruption sublass */ 23 u32 res5 : 3; /* reserved zeros */ 24 u32 ena : 1; /* enabled */ 25 u32 lm : 2; /* limit mode */ 26 u32 mme : 2; /* measurement-mode enable */ 27 u32 mp : 1; /* multipath mode */ 28 u32 tf : 1; /* timing facility */ 29 u32 dnv : 1; /* device number valid */ 30 u32 dev : 16; /* device number */ 31 u8 lpm; /* logical path mask */ 32 u8 pnom; /* path not operational mask */ 33 u8 lpum; /* last path used mask */ 34 u8 pim; /* path installed mask */ 35 u16 mbi; /* measurement-block index */ 36 u8 pom; /* path operational mask */ 37 u8 pam; /* path available mask */ 38 u8 chpid[8]; /* CHPID 0-7 (if available) */ 39 u32 unused1 : 8; /* reserved zeros */ 40 u32 st : 3; /* subchannel type */ 41 u32 unused2 : 18; /* reserved zeros */ 42 u32 mbfc : 1; /* measurement block format control */ 43 u32 xmwme : 1; /* extended measurement word mode enable */ 44 u32 csense : 1; /* concurrent sense; can be enabled ...*/ 45 /* ... per MSCH, however, if facility */ 46 /* ... is not installed, this results */ 47 /* ... in an operand exception. */ 48 } __attribute__ ((packed)); 49 50 /* Target SCHIB configuration. */ 51 struct schib_config { 52 u64 mba; 53 u32 intparm; 54 u16 mbi; 55 u32 isc:3; 56 u32 ena:1; 57 u32 mme:2; 58 u32 mp:1; 59 u32 csense:1; 60 u32 mbfc:1; 61 } __attribute__ ((packed)); 62 63 /* 64 * subchannel information block 65 */ 66 struct schib { 67 struct pmcw pmcw; /* path management control word */ 68 union scsw scsw; /* subchannel status word */ 69 __u64 mba; /* measurement block address */ 70 __u8 mda[4]; /* model dependent area */ 71 } __attribute__ ((packed,aligned(4))); 72 73 /* 74 * When rescheduled, todo's with higher values will overwrite those 75 * with lower values. 76 */ 77 enum sch_todo { 78 SCH_TODO_NOTHING, 79 SCH_TODO_EVAL, 80 SCH_TODO_UNREG, 81 }; 82 83 /* subchannel data structure used by I/O subroutines */ 84 struct subchannel { 85 struct subchannel_id schid; 86 spinlock_t lock; /* subchannel lock */ 87 struct mutex reg_mutex; 88 enum { 89 SUBCHANNEL_TYPE_IO = 0, 90 SUBCHANNEL_TYPE_CHSC = 1, 91 SUBCHANNEL_TYPE_MSG = 2, 92 SUBCHANNEL_TYPE_ADM = 3, 93 } st; /* subchannel type */ 94 __u8 vpm; /* verified path mask */ 95 __u8 lpm; /* logical path mask */ 96 __u8 opm; /* operational path mask */ 97 struct schib schib; /* subchannel information block */ 98 int isc; /* desired interruption subclass */ 99 struct chsc_ssd_info ssd_info; /* subchannel description */ 100 struct device dev; /* entry in device tree */ 101 struct css_driver *driver; 102 enum sch_todo todo; 103 struct work_struct todo_work; 104 struct schib_config config; 105 u64 dma_mask; 106 /* 107 * Driver name to force a match. Do not set directly, because core 108 * frees it. Use driver_set_override() to set or clear it. 109 */ 110 const char *driver_override; 111 } __attribute__ ((aligned(8))); 112 113 DECLARE_PER_CPU_ALIGNED(struct irb, cio_irb); 114 115 #define to_subchannel(n) container_of(n, struct subchannel, dev) 116 117 extern int cio_enable_subchannel(struct subchannel *, u32); 118 extern int cio_disable_subchannel (struct subchannel *); 119 extern int cio_cancel (struct subchannel *); 120 extern int cio_clear (struct subchannel *); 121 extern int cio_cancel_halt_clear(struct subchannel *, int *); 122 extern int cio_resume (struct subchannel *); 123 extern int cio_halt (struct subchannel *); 124 extern int cio_start (struct subchannel *, struct ccw1 *, __u8); 125 extern int cio_start_key (struct subchannel *, struct ccw1 *, __u8, __u8); 126 extern int cio_set_options (struct subchannel *, int); 127 extern int cio_update_schib(struct subchannel *sch); 128 extern int cio_commit_config(struct subchannel *sch); 129 130 int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key); 131 int cio_tm_intrg(struct subchannel *sch); 132 133 extern int __init airq_init(void); 134 135 /* Use with care. */ 136 #ifdef CONFIG_CCW_CONSOLE 137 extern struct subchannel *cio_probe_console(void); 138 extern int cio_is_console(struct subchannel_id); 139 extern void cio_register_early_subchannels(void); 140 extern void cio_tsch(struct subchannel *sch); 141 #else 142 #define cio_is_console(schid) 0 143 static inline void cio_register_early_subchannels(void) {} 144 #endif 145 146 #endif 147