diff options
Diffstat (limited to 'drivers/s390/cio/css.h')
| -rw-r--r-- | drivers/s390/cio/css.h | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/drivers/s390/cio/css.h b/drivers/s390/cio/css.h new file mode 100644 index 00000000000..2004a6c4938 --- /dev/null +++ b/drivers/s390/cio/css.h @@ -0,0 +1,155 @@ +#ifndef _CSS_H +#define _CSS_H + +#include <linux/wait.h> +#include <linux/workqueue.h> + +#include <asm/cio.h> + +/* + * path grouping stuff + */ +#define SPID_FUNC_SINGLE_PATH 0x00 +#define SPID_FUNC_MULTI_PATH 0x80 +#define SPID_FUNC_ESTABLISH 0x00 +#define SPID_FUNC_RESIGN 0x40 +#define SPID_FUNC_DISBAND 0x20 + +#define SNID_STATE1_RESET 0 +#define SNID_STATE1_UNGROUPED 2 +#define SNID_STATE1_GROUPED 3 + +#define SNID_STATE2_NOT_RESVD 0 +#define SNID_STATE2_RESVD_ELSE 2 +#define SNID_STATE2_RESVD_SELF 3 + +#define SNID_STATE3_MULTI_PATH 1 +#define SNID_STATE3_SINGLE_PATH 0 + +struct path_state { + __u8 state1 : 2; /* path state value 1 */ + __u8 state2 : 2; /* path state value 2 */ + __u8 state3 : 1; /* path state value 3 */ + __u8 resvd : 3; /* reserved */ +} __attribute__ ((packed)); + +struct pgid { + union { + __u8 fc; /* SPID function code */ + struct path_state ps; /* SNID path state */ + } inf; + __u32 cpu_addr : 16; /* CPU address */ + __u32 cpu_id : 24; /* CPU identification */ + __u32 cpu_model : 16; /* CPU model */ + __u32 tod_high; /* high word TOD clock */ +} __attribute__ ((packed)); + +extern struct pgid global_pgid; + +#define MAX_CIWS 8 + +/* + * sense-id response buffer layout + */ +struct senseid { + /* common part */ + __u8 reserved; /* always 0x'FF' */ + __u16 cu_type; /* control unit type */ + __u8 cu_model; /* control unit model */ + __u16 dev_type; /* device type */ + __u8 dev_model; /* device model */ + __u8 unused; /* padding byte */ + /* extended part */ + struct ciw ciw[MAX_CIWS]; /* variable # of CIWs */ +} __attribute__ ((packed,aligned(4))); + +struct ccw_device_private { + int state; /* device state */ + atomic_t onoff; + unsigned long registered; + __u16 devno; /* device number */ + __u16 irq; /* subchannel number */ + __u8 imask; /* lpm mask for SNID/SID/SPGID */ + int iretry; /* retry counter SNID/SID/SPGID */ + struct { + unsigned int fast:1; /* post with "channel end" */ + unsigned int repall:1; /* report every interrupt status */ + unsigned int pgroup:1; /* do path grouping */ + unsigned int force:1; /* allow forced online */ + } __attribute__ ((packed)) options; + struct { + unsigned int pgid_single:1; /* use single path for Set PGID */ + unsigned int esid:1; /* Ext. SenseID supported by HW */ + unsigned int dosense:1; /* delayed SENSE required */ + unsigned int doverify:1; /* delayed path verification */ + unsigned int donotify:1; /* call notify function */ + unsigned int recog_done:1; /* dev. recog. complete */ + unsigned int fake_irb:1; /* deliver faked irb */ + } __attribute__((packed)) flags; + unsigned long intparm; /* user interruption parameter */ + struct qdio_irq *qdio_data; + struct irb irb; /* device status */ + struct senseid senseid; /* SenseID info */ + struct pgid pgid; /* path group ID */ + struct ccw1 iccws[2]; /* ccws for SNID/SID/SPGID commands */ + struct work_struct kick_work; + wait_queue_head_t wait_q; + struct timer_list timer; + void *cmb; /* measurement information */ + struct list_head cmb_list; /* list of measured devices */ + u64 cmb_start_time; /* clock value of cmb reset */ + void *cmb_wait; /* deferred cmb enable/disable */ +}; + +/* + * A css driver handles all subchannels of one type. + * Currently, we only care about I/O subchannels (type 0), these + * have a ccw_device connected to them. + */ +struct css_driver { + unsigned int subchannel_type; + struct device_driver drv; + void (*irq)(struct device *); + int (*notify)(struct device *, int); + void (*verify)(struct device *); + void (*termination)(struct device *); +}; + +/* + * all css_drivers have the css_bus_type + */ +extern struct bus_type css_bus_type; +extern struct css_driver io_subchannel_driver; + +int css_probe_device(int irq); +extern struct subchannel * get_subchannel_by_schid(int irq); +extern unsigned int highest_subchannel; +extern int css_init_done; + +#define __MAX_SUBCHANNELS 65536 + +extern struct bus_type css_bus_type; +extern struct device css_bus_device; + +/* Some helper functions for disconnected state. */ +int device_is_disconnected(struct subchannel *); +void device_set_disconnected(struct subchannel *); +void device_trigger_reprobe(struct subchannel *); + +/* Helper functions for vary on/off. */ +int device_is_online(struct subchannel *); +void device_set_waiting(struct subchannel *); + +/* Machine check helper function. */ +void device_kill_pending_timer(struct subchannel *); + +/* Helper functions to build lists for the slow path. */ +int css_enqueue_subchannel_slow(unsigned long schid); +void css_walk_subchannel_slow_list(void (*fn)(unsigned long)); +void css_clear_subchannel_slow_list(void); +int css_slow_subchannels_exist(void); +extern int need_rescan; + +extern struct workqueue_struct *slow_path_wq; +extern struct work_struct slow_path_work; +#endif |