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[S390] cio: Add chsc subchannel driver.

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This patch adds a driver for subchannels of type chsc.

A device /dev/chsc is created which may be used to issue ioctls to:
- obtain information about the machine's I/O configuration
- dynamically change the machine's I/O configuration via
  asynchronous chsc commands

Signed-off-by: Cornelia Huck <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>
This commit is contained in:
Cornelia Huck 2008-07-14 09:59:05 +02:00 • committed by Heiko Carstens
commit 9d92a7e1b0
20 changed files with 1068 additions and 31 deletions
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3
include/asm-s390/Kbuild
View file

@ -8,6 +8,9 @@ header-y += ucontext.h
header-y += vtoc.h
header-y += zcrypt.h
header-y += kvm.h
header-y += schid.h
header-y += chsc.h
unifdef-y += cmb.h
unifdef-y += debug.h
unifdef-y += chpid.h

5
include/asm-s390/chpid.h
View file

@ -10,7 +10,6 @@
#include <linux/string.h>
#include <asm/types.h>
#include <asm/cio.h>
#define __MAX_CHPID 255
@ -41,6 +40,9 @@ static inline void chp_id_next(struct chp_id *chpid)
}
}
#ifdef __KERNEL__
#include <asm/cio.h>
static inline int chp_id_is_valid(struct chp_id *chpid)
{
return (chpid->cssid <= __MAX_CSSID);
@ -49,5 +51,6 @@ static inline int chp_id_is_valid(struct chp_id *chpid)
#define chp_id_for_each(c) \
for (chp_id_init(c); chp_id_is_valid(c); chp_id_next(c))
#endif /* __KERNEL */
#endif /* _ASM_S390_CHPID_H */

127
include/asm-s390/chsc.h Normal file
View file

@ -0,0 +1,127 @@
/*
* ioctl interface for /dev/chsc
*
* Copyright 2008 IBM Corp.
* Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
*/
#ifndef _ASM_CHSC_H
#define _ASM_CHSC_H
#include <asm/chpid.h>
#include <asm/schid.h>
struct chsc_async_header {
__u16 length;
__u16 code;
__u32 cmd_dependend;
__u32 key : 4;
__u32 : 28;
struct subchannel_id sid;
} __attribute__ ((packed));
struct chsc_async_area {
struct chsc_async_header header;
__u8 data[PAGE_SIZE - 16 /* size of chsc_async_header */];
} __attribute__ ((packed));
struct chsc_response_struct {
__u16 length;
__u16 code;
__u32 parms;
__u8 data[PAGE_SIZE - 8];
} __attribute__ ((packed));
struct chsc_chp_cd {
struct chp_id chpid;
int m;
int fmt;
struct chsc_response_struct cpcb;
};
struct chsc_cu_cd {
__u16 cun;
__u8 cssid;
int m;
int fmt;
struct chsc_response_struct cucb;
};
struct chsc_sch_cud {
struct subchannel_id schid;
int fmt;
struct chsc_response_struct scub;
};
struct conf_id {
int m;
__u8 cssid;
__u8 ssid;
};
struct chsc_conf_info {
struct conf_id id;
int fmt;
struct chsc_response_struct scid;
};
struct ccl_parm_chpid {
int m;
struct chp_id chp;
};
struct ccl_parm_cssids {
__u8 f_cssid;
__u8 l_cssid;
};
struct chsc_comp_list {
struct {
enum {
CCL_CU_ON_CHP = 1,
CCL_CHP_TYPE_CAP = 2,
CCL_CSS_IMG = 4,
CCL_CSS_IMG_CONF_CHAR = 5,
CCL_IOP_CHP = 6,
} ctype;
int fmt;
struct ccl_parm_chpid chpid;
struct ccl_parm_cssids cssids;
} req;
struct chsc_response_struct sccl;
};
struct chsc_dcal {
struct {
enum {
DCAL_CSS_IID_PN = 4,
} atype;
__u32 list_parm[2];
int fmt;
} req;
struct chsc_response_struct sdcal;
};
struct chsc_cpd_info {
struct chp_id chpid;
int m;
int fmt;
int rfmt;
int c;
struct chsc_response_struct chpdb;
};
#define CHSC_IOCTL_MAGIC 'c'
#define CHSC_START _IOWR(CHSC_IOCTL_MAGIC, 0x81, struct chsc_async_area)
#define CHSC_INFO_CHANNEL_PATH _IOWR(CHSC_IOCTL_MAGIC, 0x82, \
struct chsc_chp_cd)
#define CHSC_INFO_CU _IOWR(CHSC_IOCTL_MAGIC, 0x83, struct chsc_cu_cd)
#define CHSC_INFO_SCH_CU _IOWR(CHSC_IOCTL_MAGIC, 0x84, struct chsc_sch_cud)
#define CHSC_INFO_CI _IOWR(CHSC_IOCTL_MAGIC, 0x85, struct chsc_conf_info)
#define CHSC_INFO_CCL _IOWR(CHSC_IOCTL_MAGIC, 0x86, struct chsc_comp_list)
#define CHSC_INFO_CPD _IOWR(CHSC_IOCTL_MAGIC, 0x87, struct chsc_cpd_info)
#define CHSC_INFO_DCAL _IOWR(CHSC_IOCTL_MAGIC, 0x88, struct chsc_dcal)
#endif

1
include/asm-s390/isc.h
View file

@ -14,6 +14,7 @@
/* Regular I/O interrupts. */
#define IO_SCH_ISC 3 /* regular I/O subchannels */
#define CONSOLE_ISC 1 /* console I/O subchannel */
#define CHSC_SCH_ISC 7 /* CHSC subchannels */
/* Adapter interrupts. */
#define QDIO_AIRQ_ISC IO_SCH_ISC /* I/O subchannel in qdio mode */

28
include/asm-s390/schid.h Normal file
View file

@ -0,0 +1,28 @@
#ifndef ASM_SCHID_H
#define ASM_SCHID_H
struct subchannel_id {
__u32 cssid : 8;
__u32 : 4;
__u32 m : 1;
__u32 ssid : 2;
__u32 one : 1;
__u32 sch_no : 16;
} __attribute__ ((packed, aligned(4)));
/* Helper function for sane state of pre-allocated subchannel_id. */
static inline void
init_subchannel_id(struct subchannel_id *schid)
{
memset(schid, 0, sizeof(struct subchannel_id));
schid->one = 1;
}
static inline int
schid_equal(struct subchannel_id *schid1, struct subchannel_id *schid2)
{
return !memcmp(schid1, schid2, sizeof(struct subchannel_id));
}
#endif /* ASM_SCHID_H */