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 #include "cio.h" 15 16 /* 17 * path grouping stuff 18 */ 19 #define SPID_FUNC_SINGLE_PATH 0x00 20 #define SPID_FUNC_MULTI_PATH 0x80 21 #define SPID_FUNC_ESTABLISH 0x00 22 #define SPID_FUNC_RESIGN 0x40 23 #define SPID_FUNC_DISBAND 0x20 24 25 #define SNID_STATE1_RESET 0 26 #define SNID_STATE1_UNGROUPED 2 27 #define SNID_STATE1_GROUPED 3 28 29 #define SNID_STATE2_NOT_RESVD 0 30 #define SNID_STATE2_RESVD_ELSE 2 31 #define SNID_STATE2_RESVD_SELF 3 32 33 #define SNID_STATE3_MULTI_PATH 1 34 #define SNID_STATE3_SINGLE_PATH 0 35 36 struct path_state { 37 __u8 state1 : 2; /* path state value 1 */ 38 __u8 state2 : 2; /* path state value 2 */ 39 __u8 state3 : 1; /* path state value 3 */ 40 __u8 resvd : 3; /* reserved */ 41 } __attribute__ ((packed)); 42 43 struct extended_cssid { 44 u8 version; 45 u8 cssid; 46 } __attribute__ ((packed)); 47 48 struct pgid { 49 union { 50 __u8 fc; /* SPID function code */ 51 struct path_state ps; /* SNID path state */ 52 } __attribute__ ((packed)) inf; 53 union { 54 __u32 cpu_addr : 16; /* CPU address */ 55 struct extended_cssid ext_cssid; 56 } __attribute__ ((packed)) pgid_high; 57 __u32 cpu_id : 24; /* CPU identification */ 58 __u32 cpu_model : 16; /* CPU model */ 59 __u32 tod_high; /* high word TOD clock */ 60 } __attribute__ ((packed)); 61 62 struct subchannel; 63 struct chp_link; 64 /** 65 * struct css_driver - device driver for subchannels 66 * @owner: owning module 67 * @subchannel_type: subchannel type supported by this driver 68 * @drv: embedded device driver structure 69 * @irq: called on interrupts 70 * @chp_event: called for events affecting a channel path 71 * @sch_event: called for events affecting the subchannel 72 * @probe: function called on probe 73 * @remove: function called on remove 74 * @shutdown: called at device shutdown 75 * @prepare: prepare for pm state transition 76 * @complete: undo work done in @prepare 77 * @freeze: callback for freezing during hibernation snapshotting 78 * @thaw: undo work done in @freeze 79 * @restore: callback for restoring after hibernation 80 * @settle: wait for asynchronous work to finish 81 * @name: name of the device driver 82 */ 83 struct css_driver { 84 struct module *owner; 85 struct css_device_id *subchannel_type; 86 struct device_driver drv; 87 void (*irq)(struct subchannel *); 88 int (*chp_event)(struct subchannel *, struct chp_link *, int); 89 int (*sch_event)(struct subchannel *, int); 90 int (*probe)(struct subchannel *); 91 int (*remove)(struct subchannel *); 92 void (*shutdown)(struct subchannel *); 93 int (*prepare) (struct subchannel *); 94 void (*complete) (struct subchannel *); 95 int (*freeze)(struct subchannel *); 96 int (*thaw) (struct subchannel *); 97 int (*restore)(struct subchannel *); 98 int (*settle)(void); 99 const char *name; 100 }; 101 102 #define to_cssdriver(n) container_of(n, struct css_driver, drv) 103 104 /* 105 * all css_drivers have the css_bus_type 106 */ 107 extern struct bus_type css_bus_type; 108 109 extern int css_driver_register(struct css_driver *); 110 extern void css_driver_unregister(struct css_driver *); 111 112 extern void css_sch_device_unregister(struct subchannel *); 113 extern int css_probe_device(struct subchannel_id); 114 extern struct subchannel *get_subchannel_by_schid(struct subchannel_id); 115 extern int css_init_done; 116 extern int max_ssid; 117 int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), 118 int (*fn_unknown)(struct subchannel_id, 119 void *), void *data); 120 extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *); 121 extern void css_reiterate_subchannels(void); 122 void css_update_ssd_info(struct subchannel *sch); 123 124 #define __MAX_SUBCHANNEL 65535 125 #define __MAX_SSID 3 126 127 struct channel_subsystem { 128 u8 cssid; 129 int valid; 130 struct channel_path *chps[__MAX_CHPID + 1]; 131 struct device device; 132 struct pgid global_pgid; 133 struct mutex mutex; 134 /* channel measurement related */ 135 int cm_enabled; 136 void *cub_addr1; 137 void *cub_addr2; 138 /* for orphaned ccw devices */ 139 struct subchannel *pseudo_subchannel; 140 }; 141 #define to_css(dev) container_of(dev, struct channel_subsystem, device) 142 143 extern struct bus_type css_bus_type; 144 extern struct channel_subsystem *channel_subsystems[]; 145 146 /* Helper functions to build lists for the slow path. */ 147 void css_schedule_eval(struct subchannel_id schid); 148 void css_schedule_eval_all(void); 149 int css_complete_work(void); 150 151 int sch_is_pseudo_sch(struct subchannel *); 152 struct schib; 153 int css_sch_is_valid(struct schib *); 154 155 extern struct workqueue_struct *cio_work_q; 156 void css_wait_for_slow_path(void); 157 void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo); 158 #endif 159