forked from luck/tmp_suning_uos_patched
d302e1a5db
Channel path vary is currently broken: channel paths which are varied offline are still used by Linux. The reason for this is that: * the path mask indicating which paths of an I/O device can be used is reset by each internal I/O request * the logic that checks if a path group is already in its designated target state incorrectly interprets the result "is correctly set" as "is correctly set and available" Fix this by resetting the path mask only for internal I/O requests which affect the path mask and by correcting the pgid check logic. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
267 lines
6.7 KiB
C
267 lines
6.7 KiB
C
#ifndef S390_IO_SCH_H
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#define S390_IO_SCH_H
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#include <linux/types.h>
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#include <asm/schid.h>
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#include <asm/ccwdev.h>
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#include "css.h"
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/*
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* command-mode operation request block
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*/
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struct cmd_orb {
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u32 intparm; /* interruption parameter */
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u32 key : 4; /* flags, like key, suspend control, etc. */
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u32 spnd : 1; /* suspend control */
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u32 res1 : 1; /* reserved */
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u32 mod : 1; /* modification control */
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u32 sync : 1; /* synchronize control */
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u32 fmt : 1; /* format control */
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u32 pfch : 1; /* prefetch control */
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u32 isic : 1; /* initial-status-interruption control */
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u32 alcc : 1; /* address-limit-checking control */
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u32 ssic : 1; /* suppress-suspended-interr. control */
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u32 res2 : 1; /* reserved */
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u32 c64 : 1; /* IDAW/QDIO 64 bit control */
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u32 i2k : 1; /* IDAW 2/4kB block size control */
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u32 lpm : 8; /* logical path mask */
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u32 ils : 1; /* incorrect length */
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u32 zero : 6; /* reserved zeros */
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u32 orbx : 1; /* ORB extension control */
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u32 cpa; /* channel program address */
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} __attribute__ ((packed, aligned(4)));
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/*
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* transport-mode operation request block
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*/
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struct tm_orb {
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u32 intparm;
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u32 key:4;
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u32 :9;
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u32 b:1;
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u32 :2;
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u32 lpm:8;
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u32 :7;
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u32 x:1;
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u32 tcw;
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u32 prio:8;
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u32 :8;
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u32 rsvpgm:8;
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u32 :8;
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u32 :32;
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u32 :32;
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u32 :32;
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u32 :32;
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} __attribute__ ((packed, aligned(4)));
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union orb {
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struct cmd_orb cmd;
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struct tm_orb tm;
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} __attribute__ ((packed, aligned(4)));
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struct io_subchannel_private {
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union orb orb; /* operation request block */
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struct ccw1 sense_ccw; /* static ccw for sense command */
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} __attribute__ ((aligned(8)));
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#define to_io_private(n) ((struct io_subchannel_private *)n->private)
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#define sch_get_cdev(n) (dev_get_drvdata(&n->dev))
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#define sch_set_cdev(n, c) (dev_set_drvdata(&n->dev, c))
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#define MAX_CIWS 8
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/*
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* Possible status values for a CCW request's I/O.
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*/
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enum io_status {
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IO_DONE,
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IO_RUNNING,
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IO_STATUS_ERROR,
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IO_PATH_ERROR,
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IO_REJECTED,
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IO_KILLED
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};
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/**
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* ccw_request - Internal CCW request.
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* @cp: channel program to start
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* @timeout: maximum allowable time in jiffies between start I/O and interrupt
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* @maxretries: number of retries per I/O operation and path
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* @lpm: mask of paths to use
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* @check: optional callback that determines if results are final
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* @filter: optional callback to adjust request status based on IRB data
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* @callback: final callback
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* @data: user-defined pointer passed to all callbacks
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* @mask: current path mask
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* @retries: current number of retries
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* @drc: delayed return code
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* @cancel: non-zero if request was cancelled
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* @done: non-zero if request was finished
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*/
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struct ccw_request {
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struct ccw1 *cp;
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unsigned long timeout;
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u16 maxretries;
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u8 lpm;
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int (*check)(struct ccw_device *, void *);
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enum io_status (*filter)(struct ccw_device *, void *, struct irb *,
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enum io_status);
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void (*callback)(struct ccw_device *, void *, int);
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void *data;
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/* These fields are used internally. */
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u16 mask;
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u16 retries;
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int drc;
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int cancel:1;
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int done:1;
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} __attribute__((packed));
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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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enum cdev_todo {
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CDEV_TODO_NOTHING,
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CDEV_TODO_ENABLE_CMF,
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CDEV_TODO_REBIND,
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CDEV_TODO_REGISTER,
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CDEV_TODO_UNREG,
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CDEV_TODO_UNREG_EVAL,
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};
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struct ccw_device_private {
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struct ccw_device *cdev;
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struct subchannel *sch;
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int state; /* device state */
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atomic_t onoff;
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struct ccw_dev_id dev_id; /* device id */
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struct subchannel_id schid; /* subchannel number */
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struct ccw_request req; /* internal I/O request */
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int iretry;
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u8 pgid_valid_mask; /* mask of valid PGIDs */
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u8 pgid_todo_mask; /* mask of PGIDs to be adjusted */
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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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unsigned int mpath:1; /* do multipathing */
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} __attribute__ ((packed)) options;
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struct {
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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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unsigned int resuming:1; /* recognition while resume */
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unsigned int pgroup:1; /* pathgroup is set up */
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unsigned int mpath:1; /* multipathing is set up */
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unsigned int initialized:1; /* set if initial reference held */
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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 todo_work;
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enum cdev_todo todo;
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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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static inline int ssch(struct subchannel_id schid, union orb *addr)
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{
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register struct subchannel_id reg1 asm("1") = schid;
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int ccode = -EIO;
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asm volatile(
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" ssch 0(%2)\n"
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"0: ipm %0\n"
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" srl %0,28\n"
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"1:\n"
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EX_TABLE(0b, 1b)
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: "+d" (ccode)
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: "d" (reg1), "a" (addr), "m" (*addr)
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: "cc", "memory");
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return ccode;
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}
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static inline int rsch(struct subchannel_id schid)
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{
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register struct subchannel_id reg1 asm("1") = schid;
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int ccode;
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asm volatile(
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" rsch\n"
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" ipm %0\n"
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" srl %0,28"
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: "=d" (ccode)
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: "d" (reg1)
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: "cc", "memory");
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return ccode;
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}
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static inline int csch(struct subchannel_id schid)
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{
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register struct subchannel_id reg1 asm("1") = schid;
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int ccode;
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asm volatile(
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" csch\n"
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" ipm %0\n"
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" srl %0,28"
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: "=d" (ccode)
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: "d" (reg1)
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: "cc");
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return ccode;
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}
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static inline int hsch(struct subchannel_id schid)
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{
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register struct subchannel_id reg1 asm("1") = schid;
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int ccode;
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asm volatile(
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" hsch\n"
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" ipm %0\n"
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" srl %0,28"
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: "=d" (ccode)
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: "d" (reg1)
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: "cc");
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return ccode;
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}
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static inline int xsch(struct subchannel_id schid)
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{
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register struct subchannel_id reg1 asm("1") = schid;
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int ccode;
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asm volatile(
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" .insn rre,0xb2760000,%1,0\n"
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" ipm %0\n"
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" srl %0,28"
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: "=d" (ccode)
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: "d" (reg1)
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: "cc");
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return ccode;
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}
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#endif
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