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 * @subchannel_type: subchannel type supported by this driver 67 * @drv: embedded device driver structure 68 * @irq: called on interrupts 69 * @chp_event: called for events affecting a channel path 70 * @sch_event: called for events affecting the subchannel 71 * @probe: function called on probe 72 * @remove: function called on remove 73 * @shutdown: called at device shutdown 74 * @prepare: prepare for pm state transition 75 * @complete: undo work done in @prepare 76 * @freeze: callback for freezing during hibernation snapshotting 77 * @thaw: undo work done in @freeze 78 * @restore: callback for restoring after hibernation 79 * @settle: wait for asynchronous work to finish 80 */ 81 struct css_driver { 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 int (*settle)(void); 96 }; 97 98 #define to_cssdriver(n) container_of(n, struct css_driver, drv) 99 100 extern int css_driver_register(struct css_driver *); 101 extern void css_driver_unregister(struct css_driver *); 102 103 extern void css_sch_device_unregister(struct subchannel *); 104 extern int css_register_subchannel(struct subchannel *); 105 extern struct subchannel *css_alloc_subchannel(struct subchannel_id); 106 extern struct subchannel *get_subchannel_by_schid(struct subchannel_id); 107 extern int css_init_done; 108 extern int max_ssid; 109 int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), 110 int (*fn_unknown)(struct subchannel_id, 111 void *), void *data); 112 extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *); 113 void css_update_ssd_info(struct subchannel *sch); 114 115 struct channel_subsystem { 116 int cssid; 117 struct channel_path *chps[__MAX_CHPID + 1]; 118 struct device device; 119 struct pgid global_pgid; 120 struct mutex mutex; 121 /* channel measurement related */ 122 int cm_enabled; 123 void *cub_addr1; 124 void *cub_addr2; 125 /* for orphaned ccw devices */ 126 struct subchannel *pseudo_subchannel; 127 }; 128 #define to_css(dev) container_of(dev, struct channel_subsystem, device) 129 130 extern struct channel_subsystem *channel_subsystems[]; 131 132 /* Dummy helper which needs to change once we support more than one css. */ 133 static inline struct channel_subsystem *css_by_id(u8 cssid) 134 { 135 return channel_subsystems[0]; 136 } 137 138 /* Dummy iterator which needs to change once we support more than one css. */ 139 #define for_each_css(css) \ 140 for ((css) = channel_subsystems[0]; (css); (css) = NULL) 141 142 /* Helper functions to build lists for the slow path. */ 143 void css_schedule_eval(struct subchannel_id schid); 144 void css_schedule_eval_all(void); 145 void css_schedule_eval_all_unreg(unsigned long delay); 146 int css_complete_work(void); 147 148 int sch_is_pseudo_sch(struct subchannel *); 149 struct schib; 150 int css_sch_is_valid(struct schib *); 151 152 extern struct workqueue_struct *cio_work_q; 153 void css_wait_for_slow_path(void); 154 void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo); 155 #endif 156