167 lines · c
1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef _CSS_H3#define _CSS_H4 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 stuff19 */20#define SPID_FUNC_SINGLE_PATH 0x0021#define SPID_FUNC_MULTI_PATH 0x8022#define SPID_FUNC_ESTABLISH 0x0023#define SPID_FUNC_RESIGN 0x4024#define SPID_FUNC_DISBAND 0x2025 26#define SNID_STATE1_RESET 027#define SNID_STATE1_UNGROUPED 228#define SNID_STATE1_GROUPED 329 30#define SNID_STATE2_NOT_RESVD 031#define SNID_STATE2_RESVD_ELSE 232#define SNID_STATE2_RESVD_SELF 333 34#define SNID_STATE3_MULTI_PATH 135#define SNID_STATE3_SINGLE_PATH 036 37/*38 * Miscellaneous constants39 */40 41#define CSS_NUM_CUB_PAGES 242#define CSS_CUES_PER_PAGE 12843#define CSS_NUM_ECUB_PAGES 444#define CSS_ECUES_PER_PAGE 6445 46/*47 * Conditions used to specify which subchannels need evaluation48 */49enum 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 54struct 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 61struct extended_cssid {62 u8 version;63 u8 cssid;64} __attribute__ ((packed));65 66struct 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 80struct subchannel;81struct chp_link;82/**83 * struct css_driver - device driver for subchannels84 * @subchannel_type: subchannel type supported by this driver85 * @drv: embedded device driver structure86 * @irq: called on interrupts87 * @chp_event: called for events affecting a channel path88 * @sch_event: called for events affecting the subchannel89 * @probe: function called on probe90 * @remove: function called on remove91 * @shutdown: called at device shutdown92 * @settle: wait for asynchronous work to finish93 */94struct 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 108extern int css_driver_register(struct css_driver *);109extern void css_driver_unregister(struct css_driver *);110 111extern void css_sch_device_unregister(struct subchannel *);112extern int css_register_subchannel(struct subchannel *);113extern struct subchannel *css_alloc_subchannel(struct subchannel_id,114 struct schib *schib);115extern struct subchannel *get_subchannel_by_schid(struct subchannel_id);116extern int css_init_done;117extern int max_ssid;118int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *),119 int (*fn_unknown)(struct subchannel_id,120 void *), void *data);121extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);122void css_update_ssd_info(struct subchannel *sch);123 124struct 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 141extern struct channel_subsystem *channel_subsystems[];142 143/* Dummy helper which needs to change once we support more than one css. */144static 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. */154void css_schedule_eval(struct subchannel_id schid);155void css_schedule_eval_all(void);156void css_schedule_eval_cond(enum css_eval_cond, unsigned long delay);157int css_complete_work(void);158 159int sch_is_pseudo_sch(struct subchannel *);160struct schib;161int css_sch_is_valid(struct schib *);162 163extern struct workqueue_struct *cio_work_q;164void css_wait_for_slow_path(void);165void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo);166#endif167