1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _CSS_H 3 #define _CSS_H 4 5 #include <linux/mutex.h> 6 #include <linux/wait.h> 7 #include <linux/workqueue.h> 8 #include <linux/device.h> 9 #include <linux/types.h> 10 11 #include <asm/cio.h> 12 #include <asm/chpid.h> 13 #include <asm/schid.h> 14 15 #include "cio.h" 16 17 /* 18 * path grouping stuff 19 */ 20 #define SPID_FUNC_SINGLE_PATH 0x00 21 #define SPID_FUNC_MULTI_PATH 0x80 22 #define SPID_FUNC_ESTABLISH 0x00 23 #define SPID_FUNC_RESIGN 0x40 24 #define SPID_FUNC_DISBAND 0x20 25 26 #define SNID_STATE1_RESET 0 27 #define SNID_STATE1_UNGROUPED 2 28 #define SNID_STATE1_GROUPED 3 29 30 #define SNID_STATE2_NOT_RESVD 0 31 #define SNID_STATE2_RESVD_ELSE 2 32 #define SNID_STATE2_RESVD_SELF 3 33 34 #define SNID_STATE3_MULTI_PATH 1 35 #define SNID_STATE3_SINGLE_PATH 0 36 37 struct path_state { 38 __u8 state1 : 2; /* path state value 1 */ 39 __u8 state2 : 2; /* path state value 2 */ 40 __u8 state3 : 1; /* path state value 3 */ 41 __u8 resvd : 3; /* reserved */ 42 } __attribute__ ((packed)); 43 44 struct extended_cssid { 45 u8 version; 46 u8 cssid; 47 } __attribute__ ((packed)); 48 49 struct pgid { 50 union { 51 __u8 fc; /* SPID function code */ 52 struct path_state ps; /* SNID path state */ 53 } __attribute__ ((packed)) inf; 54 union { 55 __u32 cpu_addr : 16; /* CPU address */ 56 struct extended_cssid ext_cssid; 57 } __attribute__ ((packed)) pgid_high; 58 __u32 cpu_id : 24; /* CPU identification */ 59 __u32 cpu_model : 16; /* CPU model */ 60 __u32 tod_high; /* high word TOD clock */ 61 } __attribute__ ((packed)); 62 63 struct subchannel; 64 struct chp_link; 65 /** 66 * struct css_driver - device driver for subchannels 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 */ 82 struct css_driver { 83 struct css_device_id *subchannel_type; 84 struct device_driver drv; 85 void (*irq)(struct subchannel *); 86 int (*chp_event)(struct subchannel *, struct chp_link *, int); 87 int (*sch_event)(struct subchannel *, int); 88 int (*probe)(struct subchannel *); 89 int (*remove)(struct subchannel *); 90 void (*shutdown)(struct subchannel *); 91 int (*prepare) (struct subchannel *); 92 void (*complete) (struct subchannel *); 93 int (*freeze)(struct subchannel *); 94 int (*thaw) (struct subchannel *); 95 int (*restore)(struct subchannel *); 96 int (*settle)(void); 97 }; 98 99 #define to_cssdriver(n) container_of(n, struct css_driver, drv) 100 101 extern int css_driver_register(struct css_driver *); 102 extern void css_driver_unregister(struct css_driver *); 103 104 extern void css_sch_device_unregister(struct subchannel *); 105 extern int css_register_subchannel(struct subchannel *); 106 extern struct subchannel *css_alloc_subchannel(struct subchannel_id); 107 extern struct subchannel *get_subchannel_by_schid(struct subchannel_id); 108 extern int css_init_done; 109 extern int max_ssid; 110 int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), 111 int (*fn_unknown)(struct subchannel_id, 112 void *), void *data); 113 extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *); 114 void css_update_ssd_info(struct subchannel *sch); 115 116 struct channel_subsystem { 117 int cssid; 118 struct channel_path *chps[__MAX_CHPID + 1]; 119 struct device device; 120 struct pgid global_pgid; 121 struct mutex mutex; 122 /* channel measurement related */ 123 int cm_enabled; 124 void *cub_addr1; 125 void *cub_addr2; 126 /* for orphaned ccw devices */ 127 struct subchannel *pseudo_subchannel; 128 }; 129 #define to_css(dev) container_of(dev, struct channel_subsystem, device) 130 131 extern struct channel_subsystem *channel_subsystems[]; 132 133 /* Dummy helper which needs to change once we support more than one css. */ 134 static inline struct channel_subsystem *css_by_id(u8 cssid) 135 { 136 return channel_subsystems[0]; 137 } 138 139 /* Dummy iterator which needs to change once we support more than one css. */ 140 #define for_each_css(css) \ 141 for ((css) = channel_subsystems[0]; (css); (css) = NULL) 142 143 /* Helper functions to build lists for the slow path. */ 144 void css_schedule_eval(struct subchannel_id schid); 145 void css_schedule_eval_all(void); 146 void css_schedule_eval_all_unreg(unsigned long delay); 147 int css_complete_work(void); 148 149 int sch_is_pseudo_sch(struct subchannel *); 150 struct schib; 151 int css_sch_is_valid(struct schib *); 152 153 extern struct workqueue_struct *cio_work_q; 154 void css_wait_for_slow_path(void); 155 void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo); 156 #endif 157