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 #include <asm/schid.h> 13 14 /* 15 * path grouping stuff 16 */ 17 #define SPID_FUNC_SINGLE_PATH 0x00 18 #define SPID_FUNC_MULTI_PATH 0x80 19 #define SPID_FUNC_ESTABLISH 0x00 20 #define SPID_FUNC_RESIGN 0x40 21 #define SPID_FUNC_DISBAND 0x20 22 23 #define SNID_STATE1_RESET 0 24 #define SNID_STATE1_UNGROUPED 2 25 #define SNID_STATE1_GROUPED 3 26 27 #define SNID_STATE2_NOT_RESVD 0 28 #define SNID_STATE2_RESVD_ELSE 2 29 #define SNID_STATE2_RESVD_SELF 3 30 31 #define SNID_STATE3_MULTI_PATH 1 32 #define SNID_STATE3_SINGLE_PATH 0 33 34 struct path_state { 35 __u8 state1 : 2; /* path state value 1 */ 36 __u8 state2 : 2; /* path state value 2 */ 37 __u8 state3 : 1; /* path state value 3 */ 38 __u8 resvd : 3; /* reserved */ 39 } __attribute__ ((packed)); 40 41 struct extended_cssid { 42 u8 version; 43 u8 cssid; 44 } __attribute__ ((packed)); 45 46 struct pgid { 47 union { 48 __u8 fc; /* SPID function code */ 49 struct path_state ps; /* SNID path state */ 50 } __attribute__ ((packed)) inf; 51 union { 52 __u32 cpu_addr : 16; /* CPU address */ 53 struct extended_cssid ext_cssid; 54 } __attribute__ ((packed)) pgid_high; 55 __u32 cpu_id : 24; /* CPU identification */ 56 __u32 cpu_model : 16; /* CPU model */ 57 __u32 tod_high; /* high word TOD clock */ 58 } __attribute__ ((packed)); 59 60 struct subchannel; 61 struct chp_link; 62 /** 63 * struct css_driver - device driver for subchannels 64 * @owner: owning module 65 * @subchannel_type: subchannel type supported by this driver 66 * @drv: embedded device driver structure 67 * @irq: called on interrupts 68 * @chp_event: called for events affecting a channel path 69 * @sch_event: called for events affecting the subchannel 70 * @probe: function called on probe 71 * @remove: function called on remove 72 * @shutdown: called at device shutdown 73 * @prepare: prepare for pm state transition 74 * @complete: undo work done in @prepare 75 * @freeze: callback for freezing during hibernation snapshotting 76 * @thaw: undo work done in @freeze 77 * @restore: callback for restoring after hibernation 78 * @name: name of the device driver 79 */ 80 struct css_driver { 81 struct module *owner; 82 struct css_device_id *subchannel_type; 83 struct device_driver drv; 84 void (*irq)(struct subchannel *); 85 int (*chp_event)(struct subchannel *, struct chp_link *, int); 86 int (*sch_event)(struct subchannel *, int); 87 int (*probe)(struct subchannel *); 88 int (*remove)(struct subchannel *); 89 void (*shutdown)(struct subchannel *); 90 int (*prepare) (struct subchannel *); 91 void (*complete) (struct subchannel *); 92 int (*freeze)(struct subchannel *); 93 int (*thaw) (struct subchannel *); 94 int (*restore)(struct subchannel *); 95 const char *name; 96 }; 97 98 #define to_cssdriver(n) container_of(n, struct css_driver, drv) 99 100 /* 101 * all css_drivers have the css_bus_type 102 */ 103 extern struct bus_type css_bus_type; 104 105 extern int css_driver_register(struct css_driver *); 106 extern void css_driver_unregister(struct css_driver *); 107 108 extern void css_sch_device_unregister(struct subchannel *); 109 extern int css_probe_device(struct subchannel_id); 110 extern struct subchannel *get_subchannel_by_schid(struct subchannel_id); 111 extern int css_init_done; 112 int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), 113 int (*fn_unknown)(struct subchannel_id, 114 void *), void *data); 115 extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *); 116 extern void css_reiterate_subchannels(void); 117 void css_update_ssd_info(struct subchannel *sch); 118 119 #define __MAX_SUBCHANNEL 65535 120 #define __MAX_SSID 3 121 122 struct channel_subsystem { 123 u8 cssid; 124 int valid; 125 struct channel_path *chps[__MAX_CHPID + 1]; 126 struct device device; 127 struct pgid global_pgid; 128 struct mutex mutex; 129 /* channel measurement related */ 130 int cm_enabled; 131 void *cub_addr1; 132 void *cub_addr2; 133 /* for orphaned ccw devices */ 134 struct subchannel *pseudo_subchannel; 135 }; 136 #define to_css(dev) container_of(dev, struct channel_subsystem, device) 137 138 extern struct bus_type css_bus_type; 139 extern struct channel_subsystem *channel_subsystems[]; 140 141 /* Helper functions to build lists for the slow path. */ 142 void css_schedule_eval(struct subchannel_id schid); 143 void css_schedule_eval_all(void); 144 145 int sch_is_pseudo_sch(struct subchannel *); 146 struct schib; 147 int css_sch_is_valid(struct schib *); 148 149 extern struct workqueue_struct *slow_path_wq; 150 void css_wait_for_slow_path(void); 151 #endif 152