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 * Miscellaneous constants 39 */ 40 41 #define CSS_NUM_CUB_PAGES 2 42 #define CSS_CUES_PER_PAGE 128 43 #define CSS_NUM_ECUB_PAGES 4 44 #define CSS_ECUES_PER_PAGE 64 45 46 /* 47 * Conditions used to specify which subchannels need evaluation 48 */ 49 enum css_eval_cond { 50 CSS_EVAL_NO_PATH, /* Subchannels with no operational paths */ 51 CSS_EVAL_NOT_ONLINE /* sch without an online-device */ 52 }; 53 54 struct path_state { 55 __u8 state1 : 2; /* path state value 1 */ 56 __u8 state2 : 2; /* path state value 2 */ 57 __u8 state3 : 1; /* path state value 3 */ 58 __u8 resvd : 3; /* reserved */ 59 } __attribute__ ((packed)); 60 61 struct extended_cssid { 62 u8 version; 63 u8 cssid; 64 } __attribute__ ((packed)); 65 66 struct pgid { 67 union { 68 __u8 fc; /* SPID function code */ 69 struct path_state ps; /* SNID path state */ 70 } __attribute__ ((packed)) inf; 71 union { 72 __u32 cpu_addr : 16; /* CPU address */ 73 struct extended_cssid ext_cssid; 74 } __attribute__ ((packed)) pgid_high; 75 __u32 cpu_id : 24; /* CPU identification */ 76 __u32 cpu_model : 16; /* CPU model */ 77 __u32 tod_high; /* high word TOD clock */ 78 } __attribute__ ((packed)); 79 80 struct subchannel; 81 struct chp_link; 82 /** 83 * struct css_driver - device driver for subchannels 84 * @subchannel_type: subchannel type supported by this driver 85 * @drv: embedded device driver structure 86 * @irq: called on interrupts 87 * @chp_event: called for events affecting a channel path 88 * @sch_event: called for events affecting the subchannel 89 * @probe: function called on probe 90 * @remove: function called on remove 91 * @shutdown: called at device shutdown 92 * @settle: wait for asynchronous work to finish 93 */ 94 struct css_driver { 95 struct css_device_id *subchannel_type; 96 struct device_driver drv; 97 void (*irq)(struct subchannel *); 98 int (*chp_event)(struct subchannel *, struct chp_link *, int); 99 int (*sch_event)(struct subchannel *, int); 100 int (*probe)(struct subchannel *); 101 void (*remove)(struct subchannel *); 102 void (*shutdown)(struct subchannel *); 103 int (*settle)(void); 104 }; 105 106 #define to_cssdriver(n) container_of_const(n, struct css_driver, drv) 107 108 extern int css_driver_register(struct css_driver *); 109 extern void css_driver_unregister(struct css_driver *); 110 111 extern void css_sch_device_unregister(struct subchannel *); 112 extern int css_register_subchannel(struct subchannel *); 113 extern struct subchannel *css_alloc_subchannel(struct subchannel_id, 114 struct schib *schib); 115 extern struct subchannel *get_subchannel_by_schid(struct subchannel_id); 116 extern int css_init_done; 117 extern int max_ssid; 118 int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), 119 int (*fn_unknown)(struct subchannel_id, 120 void *), void *data); 121 extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *); 122 void css_update_ssd_info(struct subchannel *sch); 123 124 struct channel_subsystem { 125 u8 cssid; 126 u8 iid; 127 bool id_valid; /* cssid,iid */ 128 struct channel_path *chps[__MAX_CHPID + 1]; 129 struct device device; 130 struct pgid global_pgid; 131 struct mutex mutex; 132 /* channel measurement related */ 133 int cm_enabled; 134 void *cub[CSS_NUM_CUB_PAGES]; 135 void *ecub[CSS_NUM_ECUB_PAGES]; 136 /* for orphaned ccw devices */ 137 struct subchannel *pseudo_subchannel; 138 }; 139 #define to_css(dev) container_of(dev, struct channel_subsystem, device) 140 141 extern struct channel_subsystem *channel_subsystems[]; 142 143 /* Dummy helper which needs to change once we support more than one css. */ css_by_id(u8 cssid)144 static inline struct channel_subsystem *css_by_id(u8 cssid) 145 { 146 return channel_subsystems[0]; 147 } 148 149 /* Dummy iterator which needs to change once we support more than one css. */ 150 #define for_each_css(css) \ 151 for ((css) = channel_subsystems[0]; (css); (css) = NULL) 152 153 /* Helper functions to build lists for the slow path. */ 154 void css_schedule_eval(struct subchannel_id schid); 155 void css_schedule_eval_all(void); 156 void css_schedule_eval_cond(enum css_eval_cond, unsigned long delay); 157 int css_complete_work(void); 158 159 int sch_is_pseudo_sch(struct subchannel *); 160 struct schib; 161 int css_sch_is_valid(struct schib *); 162 163 extern struct workqueue_struct *cio_work_q; 164 void css_wait_for_slow_path(void); 165 void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo); 166 #endif 167