1 #ifndef _CSS_H 2 #define _CSS_H 3 4 #include <linux/mutex.h> 5 #include <linux/wait.h> 6 #include <linux/workqueue.h> 7 #include <linux/device.h> 8 #include <linux/types.h> 9 10 #include <asm/cio.h> 11 #include <asm/chpid.h> 12 13 #include "schid.h" 14 15 /* 16 * path grouping stuff 17 */ 18 #define SPID_FUNC_SINGLE_PATH 0x00 19 #define SPID_FUNC_MULTI_PATH 0x80 20 #define SPID_FUNC_ESTABLISH 0x00 21 #define SPID_FUNC_RESIGN 0x40 22 #define SPID_FUNC_DISBAND 0x20 23 24 #define SNID_STATE1_RESET 0 25 #define SNID_STATE1_UNGROUPED 2 26 #define SNID_STATE1_GROUPED 3 27 28 #define SNID_STATE2_NOT_RESVD 0 29 #define SNID_STATE2_RESVD_ELSE 2 30 #define SNID_STATE2_RESVD_SELF 3 31 32 #define SNID_STATE3_MULTI_PATH 1 33 #define SNID_STATE3_SINGLE_PATH 0 34 35 struct path_state { 36 __u8 state1 : 2; /* path state value 1 */ 37 __u8 state2 : 2; /* path state value 2 */ 38 __u8 state3 : 1; /* path state value 3 */ 39 __u8 resvd : 3; /* reserved */ 40 } __attribute__ ((packed)); 41 42 struct extended_cssid { 43 u8 version; 44 u8 cssid; 45 } __attribute__ ((packed)); 46 47 struct pgid { 48 union { 49 __u8 fc; /* SPID function code */ 50 struct path_state ps; /* SNID path state */ 51 } __attribute__ ((packed)) inf; 52 union { 53 __u32 cpu_addr : 16; /* CPU address */ 54 struct extended_cssid ext_cssid; 55 } __attribute__ ((packed)) pgid_high; 56 __u32 cpu_id : 24; /* CPU identification */ 57 __u32 cpu_model : 16; /* CPU model */ 58 __u32 tod_high; /* high word TOD clock */ 59 } __attribute__ ((packed)); 60 61 /* 62 * A css driver handles all subchannels of one type. 63 * Currently, we only care about I/O subchannels (type 0), these 64 * have a ccw_device connected to them. 65 */ 66 struct subchannel; 67 struct css_driver { 68 struct module *owner; 69 unsigned int subchannel_type; 70 struct device_driver drv; 71 void (*irq)(struct subchannel *); 72 int (*notify)(struct subchannel *, int); 73 void (*verify)(struct subchannel *); 74 void (*termination)(struct subchannel *); 75 int (*probe)(struct subchannel *); 76 int (*remove)(struct subchannel *); 77 void (*shutdown)(struct subchannel *); 78 const char *name; 79 }; 80 81 #define to_cssdriver(n) container_of(n, struct css_driver, drv) 82 83 /* 84 * all css_drivers have the css_bus_type 85 */ 86 extern struct bus_type css_bus_type; 87 88 extern int css_driver_register(struct css_driver *); 89 extern void css_driver_unregister(struct css_driver *); 90 91 extern void css_sch_device_unregister(struct subchannel *); 92 extern struct subchannel * get_subchannel_by_schid(struct subchannel_id); 93 extern int css_init_done; 94 int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), 95 int (*fn_unknown)(struct subchannel_id, 96 void *), void *data); 97 extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *); 98 extern void css_process_crw(int, int); 99 extern void css_reiterate_subchannels(void); 100 void css_update_ssd_info(struct subchannel *sch); 101 102 #define __MAX_SUBCHANNEL 65535 103 #define __MAX_SSID 3 104 105 struct channel_subsystem { 106 u8 cssid; 107 int valid; 108 struct channel_path *chps[__MAX_CHPID + 1]; 109 struct device device; 110 struct pgid global_pgid; 111 struct mutex mutex; 112 /* channel measurement related */ 113 int cm_enabled; 114 void *cub_addr1; 115 void *cub_addr2; 116 /* for orphaned ccw devices */ 117 struct subchannel *pseudo_subchannel; 118 }; 119 #define to_css(dev) container_of(dev, struct channel_subsystem, device) 120 121 extern struct bus_type css_bus_type; 122 extern struct channel_subsystem *channel_subsystems[]; 123 124 /* Some helper functions for disconnected state. */ 125 int device_is_disconnected(struct subchannel *); 126 void device_set_disconnected(struct subchannel *); 127 void device_trigger_reprobe(struct subchannel *); 128 129 /* Helper functions for vary on/off. */ 130 int device_is_online(struct subchannel *); 131 void device_kill_io(struct subchannel *); 132 void device_set_intretry(struct subchannel *sch); 133 int device_trigger_verify(struct subchannel *sch); 134 135 /* Machine check helper function. */ 136 void device_kill_pending_timer(struct subchannel *); 137 138 /* Helper functions to build lists for the slow path. */ 139 void css_schedule_eval(struct subchannel_id schid); 140 void css_schedule_eval_all(void); 141 142 int sch_is_pseudo_sch(struct subchannel *); 143 struct schib; 144 int css_sch_is_valid(struct schib *); 145 146 extern struct workqueue_struct *slow_path_wq; 147 148 extern struct attribute_group *subch_attr_groups[]; 149 #endif 150