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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _CSS_H
#define _CSS_H
#include <linux/mutex.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
#include <linux/device.h>
#include <linux/types.h>
#include <asm/cio.h>
#include <asm/chpid.h>
#include <asm/schid.h>
#include "cio.h"
/*
* path grouping stuff
*/
#define SPID_FUNC_SINGLE_PATH 0x00
#define SPID_FUNC_MULTI_PATH 0x80
#define SPID_FUNC_ESTABLISH 0x00
#define SPID_FUNC_RESIGN 0x40
#define SPID_FUNC_DISBAND 0x20
#define SNID_STATE1_RESET 0
#define SNID_STATE1_UNGROUPED 2
#define SNID_STATE1_GROUPED 3
#define SNID_STATE2_NOT_RESVD 0
#define SNID_STATE2_RESVD_ELSE 2
#define SNID_STATE2_RESVD_SELF 3
#define SNID_STATE3_MULTI_PATH 1
#define SNID_STATE3_SINGLE_PATH 0
/*
* Miscellaneous constants
*/
#define CSS_NUM_CUB_PAGES 2
#define CSS_CUES_PER_PAGE 128
#define CSS_NUM_ECUB_PAGES 4
#define CSS_ECUES_PER_PAGE 64
/*
* Conditions used to specify which subchannels need evaluation
*/
enum css_eval_cond {
CSS_EVAL_NO_PATH, /* Subchannels with no operational paths */
CSS_EVAL_NOT_ONLINE /* sch without an online-device */
};
struct path_state {
__u8 state1 : 2; /* path state value 1 */
__u8 state2 : 2; /* path state value 2 */
__u8 state3 : 1; /* path state value 3 */
__u8 resvd : 3; /* reserved */
} __attribute__ ((packed));
struct extended_cssid {
u8 version;
u8 cssid;
} __attribute__ ((packed));
struct pgid {
union {
__u8 fc; /* SPID function code */
struct path_state ps; /* SNID path state */
} __attribute__ ((packed)) inf;
union {
__u32 cpu_addr : 16; /* CPU address */
struct extended_cssid ext_cssid;
} __attribute__ ((packed)) pgid_high;
__u32 cpu_id : 24; /* CPU identification */
__u32 cpu_model : 16; /* CPU model */
__u32 tod_high; /* high word TOD clock */
} __attribute__ ((packed));
struct subchannel;
struct chp_link;
/**
* struct css_driver - device driver for subchannels
* @subchannel_type: subchannel type supported by this driver
* @drv: embedded device driver structure
* @irq: called on interrupts
* @chp_event: called for events affecting a channel path
* @sch_event: called for events affecting the subchannel
* @probe: function called on probe
* @remove: function called on remove
* @shutdown: called at device shutdown
* @settle: wait for asynchronous work to finish
*/
struct css_driver {
struct css_device_id *subchannel_type;
struct device_driver drv;
void (*irq)(struct subchannel *);
int (*chp_event)(struct subchannel *, struct chp_link *, int);
int (*sch_event)(struct subchannel *, int);
int (*probe)(struct subchannel *);
void (*remove)(struct subchannel *);
void (*shutdown)(struct subchannel *);
int (*settle)(void);
};
#define to_cssdriver(n) container_of(n, struct css_driver, drv)
extern int css_driver_register(struct css_driver *);
extern void css_driver_unregister(struct css_driver *);
extern void css_sch_device_unregister(struct subchannel *);
extern int css_register_subchannel(struct subchannel *);
extern struct subchannel *css_alloc_subchannel(struct subchannel_id,
struct schib *schib);
extern struct subchannel *get_subchannel_by_schid(struct subchannel_id);
extern int css_init_done;
extern int max_ssid;
int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *),
int (*fn_unknown)(struct subchannel_id,
void *), void *data);
extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
void css_update_ssd_info(struct subchannel *sch);
struct channel_subsystem {
u8 cssid;
u8 iid;
bool id_valid; /* cssid,iid */
struct channel_path *chps[__MAX_CHPID + 1];
struct device device;
struct pgid global_pgid;
struct mutex mutex;
/* channel measurement related */
int cm_enabled;
void *cub[CSS_NUM_CUB_PAGES];
void *ecub[CSS_NUM_ECUB_PAGES];
/* for orphaned ccw devices */
struct subchannel *pseudo_subchannel;
};
#define to_css(dev) container_of(dev, struct channel_subsystem, device)
extern struct channel_subsystem *channel_subsystems[];
/* Dummy helper which needs to change once we support more than one css. */
static inline struct channel_subsystem *css_by_id(u8 cssid)
{
return channel_subsystems[0];
}
/* Dummy iterator which needs to change once we support more than one css. */
#define for_each_css(css) \
for ((css) = channel_subsystems[0]; (css); (css) = NULL)
/* Helper functions to build lists for the slow path. */
void css_schedule_eval(struct subchannel_id schid);
void css_schedule_eval_all(void);
void css_schedule_eval_cond(enum css_eval_cond, unsigned long delay);
int css_complete_work(void);
int sch_is_pseudo_sch(struct subchannel *);
struct schib;
int css_sch_is_valid(struct schib *);
extern struct workqueue_struct *cio_work_q;
void css_wait_for_slow_path(void);
void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo);
#endif
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