forked from Minki/linux
172da89ed0
Currently when removing a device from cio_ignore list, we trigger a
path-verification for all the subchannels available in the system. This
could lead to path-verification requests on subchannels with an online
device, which could cause unwanted delay. Instead of all the
subchannels, trigger the path-verifications to those without an online
device.
Reported-by: Julian Wiedmann <jwi@linux.ibm.com>
Fixes: 2297791c92 ("s390/cio: dont unregister subchannel from child-drivers")
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
158 lines
4.6 KiB
C
158 lines
4.6 KiB
C
/* 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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/*
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* Conditions used to specify which subchannels need evaluation
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*/
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enum css_eval_cond {
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CSS_EVAL_UNREG, /* unregistered subchannels */
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CSS_EVAL_NOT_ONLINE /* sch without an online-device */
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};
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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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void (*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_cond(enum css_eval_cond, 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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