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 * @settle: wait for asynchronous work to finish 76 */ 77 struct css_driver { 78 struct css_device_id *subchannel_type; 79 struct device_driver drv; 80 void (*irq)(struct subchannel *); 81 int (*chp_event)(struct subchannel *, struct chp_link *, int); 82 int (*sch_event)(struct subchannel *, int); 83 int (*probe)(struct subchannel *); 84 int (*remove)(struct subchannel *); 85 void (*shutdown)(struct subchannel *); 86 int (*settle)(void); 87 }; 88 89 #define to_cssdriver(n) container_of(n, struct css_driver, drv) 90 91 extern int css_driver_register(struct css_driver *); 92 extern void css_driver_unregister(struct css_driver *); 93 94 extern void css_sch_device_unregister(struct subchannel *); 95 extern int css_register_subchannel(struct subchannel *); 96 extern struct subchannel *css_alloc_subchannel(struct subchannel_id, 97 struct schib *schib); 98 extern struct subchannel *get_subchannel_by_schid(struct subchannel_id); 99 extern int css_init_done; 100 extern int max_ssid; 101 int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), 102 int (*fn_unknown)(struct subchannel_id, 103 void *), void *data); 104 extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *); 105 void css_update_ssd_info(struct subchannel *sch); 106 107 struct channel_subsystem { 108 u8 cssid; 109 u8 iid; 110 bool id_valid; /* cssid,iid */ 111 struct channel_path *chps[__MAX_CHPID + 1]; 112 struct device device; 113 struct pgid global_pgid; 114 struct mutex mutex; 115 /* channel measurement related */ 116 int cm_enabled; 117 void *cub_addr1; 118 void *cub_addr2; 119 /* for orphaned ccw devices */ 120 struct subchannel *pseudo_subchannel; 121 }; 122 #define to_css(dev) container_of(dev, struct channel_subsystem, device) 123 124 extern struct channel_subsystem *channel_subsystems[]; 125 126 /* Dummy helper which needs to change once we support more than one css. */ 127 static inline struct channel_subsystem *css_by_id(u8 cssid) 128 { 129 return channel_subsystems[0]; 130 } 131 132 /* Dummy iterator which needs to change once we support more than one css. */ 133 #define for_each_css(css) \ 134 for ((css) = channel_subsystems[0]; (css); (css) = NULL) 135 136 /* Helper functions to build lists for the slow path. */ 137 void css_schedule_eval(struct subchannel_id schid); 138 void css_schedule_eval_all(void); 139 void css_schedule_eval_all_unreg(unsigned long delay); 140 int css_complete_work(void); 141 142 int sch_is_pseudo_sch(struct subchannel *); 143 struct schib; 144 int css_sch_is_valid(struct schib *); 145 146 extern struct workqueue_struct *cio_work_q; 147 void css_wait_for_slow_path(void); 148 void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo); 149 #endif 150