diff options
Diffstat (limited to 'drivers/s390/cio/css.h')
| -rw-r--r-- | drivers/s390/cio/css.h | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/drivers/s390/cio/css.h b/drivers/s390/cio/css.h new file mode 100644 index 000000000..ede0b905b --- /dev/null +++ b/drivers/s390/cio/css.h @@ -0,0 +1,157 @@ +/* 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 + +/* + * Conditions used to specify which subchannels need evaluation + */ +enum css_eval_cond { + CSS_EVAL_UNREG, /* unregistered subchannels */ + 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_addr1; + void *cub_addr2; + /* 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 |