7e560814de
1. Multipath devices for which SetPGID is not supported are not handled well. Use NOP ccws for path verification (sans path grouping) when SetPGID is not supported. 2. Check for PGIDs already set with SensePGID on _all_ paths (not just the first one) and try to find a common one. Moan if no common PGID can be found (and use NOP verification). If no PGIDs have been set, use the css global PGID (as before). (Rationale: SetPGID will get a command reject if the PGID it tries to set does not match the already set PGID.) 3. Immediately before reboot, issue RESET CHANNEL PATH (rcp) on all chpids. This will remove the old PGIDs. rcp will generate solicited CRWs which can be savely ignored by the machine check handler (all other actions create unsolicited CRWs). Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
189 lines
5.6 KiB
C
189 lines
5.6 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 <asm/cio.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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#define MAX_CIWS 8
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/*
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* sense-id response buffer layout
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*/
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struct senseid {
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/* common part */
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__u8 reserved; /* always 0x'FF' */
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__u16 cu_type; /* control unit type */
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__u8 cu_model; /* control unit model */
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__u16 dev_type; /* device type */
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__u8 dev_model; /* device model */
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__u8 unused; /* padding byte */
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/* extended part */
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struct ciw ciw[MAX_CIWS]; /* variable # of CIWs */
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} __attribute__ ((packed,aligned(4)));
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struct ccw_device_private {
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int state; /* device state */
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atomic_t onoff;
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unsigned long registered;
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__u16 devno; /* device number */
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__u16 sch_no; /* subchannel number */
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__u8 ssid; /* subchannel set id */
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__u8 imask; /* lpm mask for SNID/SID/SPGID */
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int iretry; /* retry counter SNID/SID/SPGID */
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struct {
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unsigned int fast:1; /* post with "channel end" */
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unsigned int repall:1; /* report every interrupt status */
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unsigned int pgroup:1; /* do path grouping */
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unsigned int force:1; /* allow forced online */
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} __attribute__ ((packed)) options;
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struct {
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unsigned int pgid_single:1; /* use single path for Set PGID */
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unsigned int esid:1; /* Ext. SenseID supported by HW */
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unsigned int dosense:1; /* delayed SENSE required */
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unsigned int doverify:1; /* delayed path verification */
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unsigned int donotify:1; /* call notify function */
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unsigned int recog_done:1; /* dev. recog. complete */
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unsigned int fake_irb:1; /* deliver faked irb */
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} __attribute__((packed)) flags;
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unsigned long intparm; /* user interruption parameter */
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struct qdio_irq *qdio_data;
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struct irb irb; /* device status */
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struct senseid senseid; /* SenseID info */
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struct pgid pgid[8]; /* path group IDs per chpid*/
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struct ccw1 iccws[2]; /* ccws for SNID/SID/SPGID commands */
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struct work_struct kick_work;
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wait_queue_head_t wait_q;
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struct timer_list timer;
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void *cmb; /* measurement information */
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struct list_head cmb_list; /* list of measured devices */
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u64 cmb_start_time; /* clock value of cmb reset */
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void *cmb_wait; /* deferred cmb enable/disable */
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};
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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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unsigned int subchannel_type;
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struct device_driver drv;
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void (*irq)(struct device *);
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int (*notify)(struct device *, int);
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void (*verify)(struct device *);
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void (*termination)(struct device *);
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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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};
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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 struct css_driver io_subchannel_driver;
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extern int css_probe_device(struct subchannel_id);
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extern int css_sch_device_register(struct subchannel *);
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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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extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
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#define __MAX_SUBCHANNEL 65535
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#define __MAX_SSID 3
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#define __MAX_CHPID 255
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#define __MAX_CSSID 0
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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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};
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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 *css[];
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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_set_waiting(struct subchannel *);
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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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extern int css_enqueue_subchannel_slow(struct subchannel_id schid);
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void css_walk_subchannel_slow_list(void (*fn)(unsigned long));
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void css_clear_subchannel_slow_list(void);
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int css_slow_subchannels_exist(void);
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extern int need_rescan;
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extern struct workqueue_struct *slow_path_wq;
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extern struct work_struct slow_path_work;
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#endif
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