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 /* 38 * Conditions used to specify which subchannels need evaluation 39 */ 40 enum css_eval_cond { 41 CSS_EVAL_NO_PATH, /* Subchannels with no operational paths */ 42 CSS_EVAL_NOT_ONLINE /* sch without an online-device */ 43 }; 44 45 struct path_state { 46 __u8 state1 : 2; /* path state value 1 */ 47 __u8 state2 : 2; /* path state value 2 */ 48 __u8 state3 : 1; /* path state value 3 */ 49 __u8 resvd : 3; /* reserved */ 50 } __attribute__ ((packed)); 51 52 struct extended_cssid { 53 u8 version; 54 u8 cssid; 55 } __attribute__ ((packed)); 56 57 struct pgid { 58 union { 59 __u8 fc; /* SPID function code */ 60 struct path_state ps; /* SNID path state */ 61 } __attribute__ ((packed)) inf; 62 union { 63 __u32 cpu_addr : 16; /* CPU address */ 64 struct extended_cssid ext_cssid; 65 } __attribute__ ((packed)) pgid_high; 66 __u32 cpu_id : 24; /* CPU identification */ 67 __u32 cpu_model : 16; /* CPU model */ 68 __u32 tod_high; /* high word TOD clock */ 69 } __attribute__ ((packed)); 70 71 struct subchannel; 72 struct chp_link; 73 /** 74 * struct css_driver - device driver for subchannels 75 * @subchannel_type: subchannel type supported by this driver 76 * @drv: embedded device driver structure 77 * @irq: called on interrupts 78 * @chp_event: called for events affecting a channel path 79 * @sch_event: called for events affecting the subchannel 80 * @probe: function called on probe 81 * @remove: function called on remove 82 * @shutdown: called at device shutdown 83 * @settle: wait for asynchronous work to finish 84 */ 85 struct css_driver { 86 struct css_device_id *subchannel_type; 87 struct device_driver drv; 88 void (*irq)(struct subchannel *); 89 int (*chp_event)(struct subchannel *, struct chp_link *, int); 90 int (*sch_event)(struct subchannel *, int); 91 int (*probe)(struct subchannel *); 92 void (*remove)(struct subchannel *); 93 void (*shutdown)(struct subchannel *); 94 int (*settle)(void); 95 }; 96 97 #define to_cssdriver(n) container_of(n, struct css_driver, drv) 98 99 extern int css_driver_register(struct css_driver *); 100 extern void css_driver_unregister(struct css_driver *); 101 102 extern void css_sch_device_unregister(struct subchannel *); 103 extern int css_register_subchannel(struct subchannel *); 104 extern struct subchannel *css_alloc_subchannel(struct subchannel_id, 105 struct schib *schib); 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 u8 cssid; 117 u8 iid; 118 bool id_valid; /* cssid,iid */ 119 struct channel_path *chps[__MAX_CHPID + 1]; 120 struct device device; 121 struct pgid global_pgid; 122 struct mutex mutex; 123 /* channel measurement related */ 124 int cm_enabled; 125 void *cub_addr1; 126 void *cub_addr2; 127 /* for orphaned ccw devices */ 128 struct subchannel *pseudo_subchannel; 129 }; 130 #define to_css(dev) container_of(dev, struct channel_subsystem, device) 131 132 extern struct channel_subsystem *channel_subsystems[]; 133 134 /* Dummy helper which needs to change once we support more than one css. */ 135 static inline struct channel_subsystem *css_by_id(u8 cssid) 136 { 137 return channel_subsystems[0]; 138 } 139 140 /* Dummy iterator which needs to change once we support more than one css. */ 141 #define for_each_css(css) \ 142 for ((css) = channel_subsystems[0]; (css); (css) = NULL) 143 144 /* Helper functions to build lists for the slow path. */ 145 void css_schedule_eval(struct subchannel_id schid); 146 void css_schedule_eval_all(void); 147 void css_schedule_eval_cond(enum css_eval_cond, unsigned long delay); 148 int css_complete_work(void); 149 150 int sch_is_pseudo_sch(struct subchannel *); 151 struct schib; 152 int css_sch_is_valid(struct schib *); 153 154 extern struct workqueue_struct *cio_work_q; 155 void css_wait_for_slow_path(void); 156 void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo); 157 #endif 158