202 lines
6.1 KiB
C
202 lines
6.1 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 <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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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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unsigned long registered;
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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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__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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unsigned int intretry:1; /* retry internal operation */
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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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extern int css_process_crw(int, int);
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extern void css_reiterate_subchannels(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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/* 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 *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_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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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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int sch_is_pseudo_sch(struct subchannel *);
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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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int subchannel_add_files (struct device *);
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extern struct attribute_group *subch_attr_groups[];
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#endif
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