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149 lines
4.4 KiB
149 lines
4.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _CSS_H |
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#define _CSS_H |
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#include <linux/mutex.h> |
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#include <linux/wait.h> |
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#include <linux/workqueue.h> |
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#include <linux/device.h> |
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#include <linux/types.h> |
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#include <asm/cio.h> |
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#include <asm/chpid.h> |
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#include <asm/schid.h> |
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#include "cio.h" |
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/* |
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* path grouping stuff |
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*/ |
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#define SPID_FUNC_SINGLE_PATH 0x00 |
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#define SPID_FUNC_MULTI_PATH 0x80 |
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#define SPID_FUNC_ESTABLISH 0x00 |
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#define SPID_FUNC_RESIGN 0x40 |
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#define SPID_FUNC_DISBAND 0x20 |
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#define SNID_STATE1_RESET 0 |
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#define SNID_STATE1_UNGROUPED 2 |
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#define SNID_STATE1_GROUPED 3 |
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#define SNID_STATE2_NOT_RESVD 0 |
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#define SNID_STATE2_RESVD_ELSE 2 |
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#define SNID_STATE2_RESVD_SELF 3 |
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#define SNID_STATE3_MULTI_PATH 1 |
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#define SNID_STATE3_SINGLE_PATH 0 |
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struct path_state { |
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__u8 state1 : 2; /* path state value 1 */ |
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__u8 state2 : 2; /* path state value 2 */ |
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__u8 state3 : 1; /* path state value 3 */ |
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__u8 resvd : 3; /* reserved */ |
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} __attribute__ ((packed)); |
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struct extended_cssid { |
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u8 version; |
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u8 cssid; |
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} __attribute__ ((packed)); |
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struct pgid { |
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union { |
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__u8 fc; /* SPID function code */ |
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struct path_state ps; /* SNID path state */ |
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} __attribute__ ((packed)) inf; |
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union { |
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__u32 cpu_addr : 16; /* CPU address */ |
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struct extended_cssid ext_cssid; |
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} __attribute__ ((packed)) pgid_high; |
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__u32 cpu_id : 24; /* CPU identification */ |
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__u32 cpu_model : 16; /* CPU model */ |
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__u32 tod_high; /* high word TOD clock */ |
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} __attribute__ ((packed)); |
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struct subchannel; |
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struct chp_link; |
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/** |
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* struct css_driver - device driver for subchannels |
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* @subchannel_type: subchannel type supported by this driver |
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* @drv: embedded device driver structure |
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* @irq: called on interrupts |
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* @chp_event: called for events affecting a channel path |
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* @sch_event: called for events affecting the subchannel |
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* @probe: function called on probe |
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* @remove: function called on remove |
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* @shutdown: called at device shutdown |
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* @settle: wait for asynchronous work to finish |
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*/ |
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struct css_driver { |
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struct css_device_id *subchannel_type; |
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struct device_driver drv; |
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void (*irq)(struct subchannel *); |
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int (*chp_event)(struct subchannel *, struct chp_link *, int); |
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int (*sch_event)(struct subchannel *, int); |
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int (*probe)(struct subchannel *); |
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int (*remove)(struct subchannel *); |
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void (*shutdown)(struct subchannel *); |
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int (*settle)(void); |
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}; |
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#define to_cssdriver(n) container_of(n, struct css_driver, drv) |
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extern int css_driver_register(struct css_driver *); |
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extern void css_driver_unregister(struct css_driver *); |
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extern void css_sch_device_unregister(struct subchannel *); |
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extern int css_register_subchannel(struct subchannel *); |
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extern struct subchannel *css_alloc_subchannel(struct subchannel_id, |
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struct schib *schib); |
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extern struct subchannel *get_subchannel_by_schid(struct subchannel_id); |
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extern int css_init_done; |
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extern int max_ssid; |
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int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), |
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int (*fn_unknown)(struct subchannel_id, |
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void *), void *data); |
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extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *); |
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void css_update_ssd_info(struct subchannel *sch); |
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struct channel_subsystem { |
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u8 cssid; |
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u8 iid; |
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bool id_valid; /* cssid,iid */ |
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struct channel_path *chps[__MAX_CHPID + 1]; |
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struct device device; |
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struct pgid global_pgid; |
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struct mutex mutex; |
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/* channel measurement related */ |
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int cm_enabled; |
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void *cub_addr1; |
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void *cub_addr2; |
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/* for orphaned ccw devices */ |
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struct subchannel *pseudo_subchannel; |
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}; |
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#define to_css(dev) container_of(dev, struct channel_subsystem, device) |
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extern struct channel_subsystem *channel_subsystems[]; |
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/* Dummy helper which needs to change once we support more than one css. */ |
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static inline struct channel_subsystem *css_by_id(u8 cssid) |
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{ |
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return channel_subsystems[0]; |
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} |
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/* Dummy iterator which needs to change once we support more than one css. */ |
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#define for_each_css(css) \ |
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for ((css) = channel_subsystems[0]; (css); (css) = NULL) |
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/* Helper functions to build lists for the slow path. */ |
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void css_schedule_eval(struct subchannel_id schid); |
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void css_schedule_eval_all(void); |
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void css_schedule_eval_all_unreg(unsigned long delay); |
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int css_complete_work(void); |
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int sch_is_pseudo_sch(struct subchannel *); |
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struct schib; |
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int css_sch_is_valid(struct schib *); |
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extern struct workqueue_struct *cio_work_q; |
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void css_wait_for_slow_path(void); |
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void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo); |
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#endif
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