e82a1567e4
Minimize calls to cpu intensive function get_subchannel_by_schid() by introducing function for_each_subchannel_staged() which temporarily caches the information about registered subchannels in a bitmap. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
150 lines
4.1 KiB
C
150 lines
4.1 KiB
C
#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 "schid.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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/*
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* A css driver handles all subchannels of one type.
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* Currently, we only care about I/O subchannels (type 0), these
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* have a ccw_device connected to them.
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*/
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struct subchannel;
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struct css_driver {
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struct module *owner;
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unsigned int subchannel_type;
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struct device_driver drv;
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void (*irq)(struct subchannel *);
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int (*notify)(struct subchannel *, int);
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void (*verify)(struct subchannel *);
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void (*termination)(struct subchannel *);
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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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const char *name;
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};
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#define to_cssdriver(n) container_of(n, struct css_driver, drv)
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/*
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* all css_drivers have the css_bus_type
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*/
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extern struct bus_type css_bus_type;
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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 struct subchannel * get_subchannel_by_schid(struct subchannel_id);
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extern int css_init_done;
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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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extern void css_process_crw(int, int);
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extern void css_reiterate_subchannels(void);
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void css_update_ssd_info(struct subchannel *sch);
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#define __MAX_SUBCHANNEL 65535
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#define __MAX_SSID 3
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struct channel_subsystem {
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u8 cssid;
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int valid;
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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 bus_type css_bus_type;
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extern struct channel_subsystem *channel_subsystems[];
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/* Some helper functions for disconnected state. */
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int device_is_disconnected(struct subchannel *);
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void device_set_disconnected(struct subchannel *);
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void device_trigger_reprobe(struct subchannel *);
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/* Helper functions for vary on/off. */
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int device_is_online(struct subchannel *);
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void device_kill_io(struct subchannel *);
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void device_set_intretry(struct subchannel *sch);
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int device_trigger_verify(struct subchannel *sch);
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/* Machine check helper function. */
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void device_kill_pending_timer(struct subchannel *);
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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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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 *slow_path_wq;
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extern struct attribute_group *subch_attr_groups[];
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#endif
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