176 lines
5.4 KiB
C
176 lines
5.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#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 <asm/irq.h>
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#include "css.h"
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#include "orb.h"
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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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struct ccw_device *cdev;/* pointer to the child ccw device */
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struct {
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unsigned int suspend:1; /* allow suspend */
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unsigned int prefetch:1;/* deny prefetch */
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unsigned int inter:1; /* suppress intermediate interrupts */
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} __packed options;
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} __aligned(8);
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#define to_io_private(n) ((struct io_subchannel_private *) \
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dev_get_drvdata(&(n)->dev))
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#define set_io_private(n, p) (dev_set_drvdata(&(n)->dev, p))
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static inline struct ccw_device *sch_get_cdev(struct subchannel *sch)
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{
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struct io_subchannel_private *priv = to_io_private(sch);
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return priv ? priv->cdev : NULL;
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}
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static inline void sch_set_cdev(struct subchannel *sch,
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struct ccw_device *cdev)
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{
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struct io_subchannel_private *priv = to_io_private(sch);
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if (priv)
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priv->cdev = cdev;
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}
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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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* @singlepath: if set, use only one path from @lpm per start I/O
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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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* @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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*/
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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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unsigned int singlepath:1;
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/* These fields are used internally. */
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unsigned int cancel:1;
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unsigned int done:1;
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u16 mask;
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u16 retries;
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int drc;
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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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#define FAKE_CMD_IRB 1
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#define FAKE_TM_IRB 2
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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 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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u8 pgid_reset_mask; /* mask of PGIDs which were reset */
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u8 path_noirq_mask; /* mask of paths for which no irq was
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received */
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u8 path_notoper_mask; /* mask of paths which were found
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not operable */
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u8 path_gone_mask; /* mask of paths, that became unavailable */
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u8 path_new_mask; /* mask of paths, that became available */
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u8 path_broken_mask; /* mask of paths, which were found to be
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unusable */
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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:2; /* 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 pgid_unknown:1;/* unknown pgid state */
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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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int async_kill_io_rc;
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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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enum interruption_class int_class;
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};
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#endif
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