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1f44a22577
With the introduction of PCI it became apparent that s390 should convert to generic hardirqs as too many drivers do not have the correct dependency for GENERIC_HARDIRQS. On the architecture level s390 does not have irq lines. It has external interrupts, I/O interrupts and adapter interrupts. This patch hard-codes all external interrupts as irq #1, all I/O interrupts as irq #2 and all adapter interrupts as irq #3. The additional information from the lowcore associated with the interrupt is stored in the pt_regs of the interrupt frame, where the interrupt handler can pick it up. For PCI/MSI interrupts the adapter interrupt handler scans the relevant bit fields and calls generic_handle_irq with the virtual irq number for the MSI interrupt. Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
136 lines
4.1 KiB
C
136 lines
4.1 KiB
C
#ifndef S390_CIO_H
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#define S390_CIO_H
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#include <linux/mutex.h>
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#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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#include <asm/chpid.h>
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#include <asm/cio.h>
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#include <asm/fcx.h>
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#include <asm/schid.h>
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#include "chsc.h"
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/*
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* path management control word
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*/
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struct pmcw {
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u32 intparm; /* interruption parameter */
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u32 qf : 1; /* qdio facility */
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u32 w : 1;
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u32 isc : 3; /* interruption sublass */
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u32 res5 : 3; /* reserved zeros */
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u32 ena : 1; /* enabled */
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u32 lm : 2; /* limit mode */
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u32 mme : 2; /* measurement-mode enable */
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u32 mp : 1; /* multipath mode */
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u32 tf : 1; /* timing facility */
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u32 dnv : 1; /* device number valid */
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u32 dev : 16; /* device number */
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u8 lpm; /* logical path mask */
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u8 pnom; /* path not operational mask */
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u8 lpum; /* last path used mask */
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u8 pim; /* path installed mask */
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u16 mbi; /* measurement-block index */
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u8 pom; /* path operational mask */
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u8 pam; /* path available mask */
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u8 chpid[8]; /* CHPID 0-7 (if available) */
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u32 unused1 : 8; /* reserved zeros */
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u32 st : 3; /* subchannel type */
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u32 unused2 : 18; /* reserved zeros */
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u32 mbfc : 1; /* measurement block format control */
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u32 xmwme : 1; /* extended measurement word mode enable */
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u32 csense : 1; /* concurrent sense; can be enabled ...*/
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/* ... per MSCH, however, if facility */
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/* ... is not installed, this results */
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/* ... in an operand exception. */
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} __attribute__ ((packed));
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/* Target SCHIB configuration. */
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struct schib_config {
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u64 mba;
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u32 intparm;
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u16 mbi;
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u32 isc:3;
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u32 ena:1;
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u32 mme:2;
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u32 mp:1;
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u32 csense:1;
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u32 mbfc:1;
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} __attribute__ ((packed));
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/*
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* subchannel information block
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*/
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struct schib {
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struct pmcw pmcw; /* path management control word */
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union scsw scsw; /* subchannel status word */
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__u64 mba; /* measurement block address */
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__u8 mda[4]; /* model dependent area */
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} __attribute__ ((packed,aligned(4)));
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/*
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* When rescheduled, todo's with higher values will overwrite those
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* with lower values.
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*/
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enum sch_todo {
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SCH_TODO_NOTHING,
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SCH_TODO_EVAL,
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SCH_TODO_UNREG,
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};
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/* subchannel data structure used by I/O subroutines */
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struct subchannel {
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struct subchannel_id schid;
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spinlock_t *lock; /* subchannel lock */
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struct mutex reg_mutex;
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enum {
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SUBCHANNEL_TYPE_IO = 0,
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SUBCHANNEL_TYPE_CHSC = 1,
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SUBCHANNEL_TYPE_MSG = 2,
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SUBCHANNEL_TYPE_ADM = 3,
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} st; /* subchannel type */
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__u8 vpm; /* verified path mask */
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__u8 lpm; /* logical path mask */
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__u8 opm; /* operational path mask */
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struct schib schib; /* subchannel information block */
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int isc; /* desired interruption subclass */
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struct chsc_ssd_info ssd_info; /* subchannel description */
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struct device dev; /* entry in device tree */
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struct css_driver *driver;
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enum sch_todo todo;
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struct work_struct todo_work;
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struct schib_config config;
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} __attribute__ ((aligned(8)));
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#define to_subchannel(n) container_of(n, struct subchannel, dev)
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extern int cio_validate_subchannel (struct subchannel *, struct subchannel_id);
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extern int cio_enable_subchannel(struct subchannel *, u32);
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extern int cio_disable_subchannel (struct subchannel *);
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extern int cio_cancel (struct subchannel *);
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extern int cio_clear (struct subchannel *);
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extern int cio_resume (struct subchannel *);
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extern int cio_halt (struct subchannel *);
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extern int cio_start (struct subchannel *, struct ccw1 *, __u8);
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extern int cio_start_key (struct subchannel *, struct ccw1 *, __u8, __u8);
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extern int cio_cancel (struct subchannel *);
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extern int cio_set_options (struct subchannel *, int);
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extern int cio_update_schib(struct subchannel *sch);
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extern int cio_commit_config(struct subchannel *sch);
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int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key);
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int cio_tm_intrg(struct subchannel *sch);
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/* Use with care. */
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#ifdef CONFIG_CCW_CONSOLE
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extern struct subchannel *cio_probe_console(void);
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extern int cio_is_console(struct subchannel_id);
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extern void cio_register_early_subchannels(void);
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extern void cio_tsch(struct subchannel *sch);
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#else
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#define cio_is_console(schid) 0
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static inline void cio_register_early_subchannels(void) {}
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#endif
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#endif
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