Re: [Qemu-devel] [PATCH 2/8] s390: Channel I/O basic defintions.

[Cornelia Huck <cornelia.huck@de.ibm.com>]

On Mon, 10 Dec 2012 09:07:57 +0100
Alexander Graf <agraf@suse.de> wrote:

> 
> On 07.12.2012, at 13:50, Cornelia Huck wrote:
> 
> > Basic channel I/O structures and helper function.
> > 
> > Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
> > ---
> > target-s390x/Makefile.objs |   2 +-
> > target-s390x/ioinst.c      |  46 ++++++++++
> > target-s390x/ioinst.h      | 207 +++++++++++++++++++++++++++++++++++++++++++++
> > 3 files changed, 254 insertions(+), 1 deletion(-)
> > create mode 100644 target-s390x/ioinst.c
> > create mode 100644 target-s390x/ioinst.h
> > 
> > diff --git a/target-s390x/Makefile.objs b/target-s390x/Makefile.objs
> > index e728abf..3afb0b7 100644
> > --- a/target-s390x/Makefile.objs
> > +++ b/target-s390x/Makefile.objs
> > @@ -1,4 +1,4 @@
> > obj-y += translate.o helper.o cpu.o interrupt.o
> > obj-y += int_helper.o fpu_helper.o cc_helper.o mem_helper.o misc_helper.o
> > -obj-$(CONFIG_SOFTMMU) += machine.o
> > +obj-$(CONFIG_SOFTMMU) += machine.o ioinst.o
> > obj-$(CONFIG_KVM) += kvm.o
> > diff --git a/target-s390x/ioinst.c b/target-s390x/ioinst.c
> > new file mode 100644
> > index 0000000..8577b2c
> > --- /dev/null
> > +++ b/target-s390x/ioinst.c
> > @@ -0,0 +1,46 @@
> > +/*
> > + * I/O instructions for S/390
> > + *
> > + * Copyright 2012 IBM Corp.
> > + * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
> > + *
> > + * This work is licensed under the terms of the GNU GPL, version 2 or (at
> > + * your option) any later version. See the COPYING file in the top-level
> > + * directory.
> > + */
> > +
> > +#include <sys/types.h>
> > +#include <sys/ioctl.h>
> > +#include <sys/mman.h>
> > +
> > +#include "cpu.h"
> > +#include "ioinst.h"
> > +
> > +#ifdef DEBUG_IOINST
> > +#define dprintf(fmt, ...) \
> > +    do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
> > +#else
> > +#define dprintf(fmt, ...) \
> > +    do { } while (0)
> > +#endif
> > +
> > +int ioinst_disassemble_sch_ident(uint32_t value, int *m, int *cssid, int *ssid,
> > +                                 int *schid)
> > +{
> > +    if (!(value & IOINST_SCHID_ONE)) {
> > +        return -EINVAL;
> > +    }
> > +    if (!(value & IOINST_SCHID_M)) {
> > +        if (value & IOINST_SCHID_CSSID) {
> > +            return -EINVAL;
> > +        }
> > +        *cssid = 0;
> > +        *m = 0;
> > +    } else {
> > +        *cssid = (value & IOINST_SCHID_CSSID) >> 24;
> 
> (value & IOINST_SCHID_CSSID_MASK) >> IOINST_SCHID_CSSID_SHIFT

I think that actually decreases readability.

> 
> 
> Alex
> 
> > +        *m = 1;
> > +    }
> > +    *ssid = (value & IOINST_SCHID_SSID) >> 17;
> > +    *schid = value & IOINST_SCHID_NR;
> > +    return 0;
> > +}
> > diff --git a/target-s390x/ioinst.h b/target-s390x/ioinst.h
> > new file mode 100644
> > index 0000000..b5b4a03
> > --- /dev/null
> > +++ b/target-s390x/ioinst.h
> > @@ -0,0 +1,207 @@
> > +/*
> > + * S/390 channel I/O instructions
> > + *
> > + * Copyright 2012 IBM Corp.
> > + * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
> > + *
> > + * This work is licensed under the terms of the GNU GPL, version 2 or (at
> > + * your option) any later version. See the COPYING file in the top-level
> > + * directory.
> > +*/
> > +
> > +#ifndef IOINST_S390X_H
> > +#define IOINST_S390X_H
> > +/*
> > + * Channel I/O related definitions, as defined in the Principles
> > + * Of Operation (and taken from the Linux implementation).
> > + */
> > +
> > +/* subchannel status word (command mode only) */
> > +typedef struct SCSW {
> > +    uint16_t flags;
> > +    uint16_t ctrl;
> > +    uint32_t cpa;
> > +    uint8_t dstat;
> > +    uint8_t cstat;
> > +    uint16_t count;
> > +} QEMU_PACKED SCSW;
> > +
> > +#define SCSW_FLAGS_MASK_KEY 0xf000
> > +#define SCSW_FLAGS_MASK_SCTL 0x0800
> > +#define SCSW_FLAGS_MASK_ESWF 0x0400
> > +#define SCSW_FLAGS_MASK_CC 0x0300
> > +#define SCSW_FLAGS_MASK_FMT 0x0080
> > +#define SCSW_FLAGS_MASK_PFCH 0x0040
> > +#define SCSW_FLAGS_MASK_ISIC 0x0020
> > +#define SCSW_FLAGS_MASK_ALCC 0x0010
> > +#define SCSW_FLAGS_MASK_SSI 0x0008
> > +#define SCSW_FLAGS_MASK_ZCC 0x0004
> > +#define SCSW_FLAGS_MASK_ECTL 0x0002
> > +#define SCSW_FLAGS_MASK_PNO 0x0001
> > +
> > +#define SCSW_CTRL_MASK_FCTL 0x7000
> > +#define SCSW_CTRL_MASK_ACTL 0x0fe0
> > +#define SCSW_CTRL_MASK_STCTL 0x001f
> > +
> > +#define SCSW_FCTL_CLEAR_FUNC 0x1000
> > +#define SCSW_FCTL_HALT_FUNC 0x2000
> > +#define SCSW_FCTL_START_FUNC 0x4000
> > +
> > +#define SCSW_ACTL_SUSP 0x0020
> > +#define SCSW_ACTL_DEVICE_ACTIVE 0x0040
> > +#define SCSW_ACTL_SUBCH_ACTIVE 0x0080
> > +#define SCSW_ACTL_CLEAR_PEND 0x0100
> > +#define SCSW_ACTL_HALT_PEND  0x0200
> > +#define SCSW_ACTL_START_PEND 0x0400
> > +#define SCSW_ACTL_RESUME_PEND 0x0800
> > +
> > +#define SCSW_STCTL_STATUS_PEND 0x0001
> > +#define SCSW_STCTL_SECONDARY 0x0002
> > +#define SCSW_STCTL_PRIMARY 0x0004
> > +#define SCSW_STCTL_INTERMEDIATE 0x0008
> > +#define SCSW_STCTL_ALERT 0x0010
> > +
> > +#define SCSW_DSTAT_ATTENTION     0x80
> > +#define SCSW_DSTAT_STAT_MOD      0x40
> > +#define SCSW_DSTAT_CU_END        0x20
> > +#define SCSW_DSTAT_BUSY          0x10
> > +#define SCSW_DSTAT_CHANNEL_END   0x08
> > +#define SCSW_DSTAT_DEVICE_END    0x04
> > +#define SCSW_DSTAT_UNIT_CHECK    0x02
> > +#define SCSW_DSTAT_UNIT_EXCEP    0x01
> > +
> > +#define SCSW_CSTAT_PCI           0x80
> > +#define SCSW_CSTAT_INCORR_LEN    0x40
> > +#define SCSW_CSTAT_PROG_CHECK    0x20
> > +#define SCSW_CSTAT_PROT_CHECK    0x10
> > +#define SCSW_CSTAT_DATA_CHECK    0x08
> > +#define SCSW_CSTAT_CHN_CTRL_CHK  0x04
> > +#define SCSW_CSTAT_INTF_CTRL_CHK 0x02
> > +#define SCSW_CSTAT_CHAIN_CHECK   0x01
> > +
> > +/* path management control word */
> > +typedef struct PMCW {
> > +    uint32_t intparm;
> > +    uint16_t flags;
> > +    uint16_t devno;
> > +    uint8_t  lpm;
> > +    uint8_t  pnom;
> > +    uint8_t  lpum;
> > +    uint8_t  pim;
> > +    uint16_t mbi;
> > +    uint8_t  pom;
> > +    uint8_t  pam;
> > +    uint8_t  chpid[8];
> > +    uint32_t chars;
> > +} QEMU_PACKED PMCW;
> > +
> > +#define PMCW_FLAGS_MASK_QF 0x8000
> > +#define PMCW_FLAGS_MASK_W 0x4000
> > +#define PMCW_FLAGS_MASK_ISC 0x3800
> > +#define PMCW_FLAGS_MASK_ENA 0x0080
> > +#define PMCW_FLAGS_MASK_LM 0x0060
> > +#define PMCW_FLAGS_MASK_MME 0x0018
> > +#define PMCW_FLAGS_MASK_MP 0x0004
> > +#define PMCW_FLAGS_MASK_TF 0x0002
> > +#define PMCW_FLAGS_MASK_DNV 0x0001
> > +#define PMCW_FLAGS_MASK_INVALID 0x0700
> > +
> > +#define PMCW_CHARS_MASK_ST 0x00e00000
> > +#define PMCW_CHARS_MASK_MBFC 0x00000004
> > +#define PMCW_CHARS_MASK_XMWME 0x00000002
> > +#define PMCW_CHARS_MASK_CSENSE 0x00000001
> > +#define PMCW_CHARS_MASK_INVALID 0xff1ffff8
> > +
> > +/* subchannel information block */
> > +struct SCHIB {
> > +    PMCW pmcw;
> > +    SCSW scsw;
> > +    uint64_t mba;
> > +    uint8_t mda[4];
> > +} QEMU_PACKED;
> > +
> > +/* interruption response block */
> > +typedef struct IRB {
> > +    SCSW scsw;
> > +    uint32_t esw[5];
> > +    uint32_t ecw[8];
> > +    uint32_t emw[8];
> > +} QEMU_PACKED IRB;
> > +
> > +/* operation request block */
> > +struct ORB {
> > +    uint32_t intparm;
> > +    uint16_t ctrl0;
> > +    uint8_t lpm;
> > +    uint8_t ctrl1;
> > +    uint32_t cpa;
> > +} QEMU_PACKED;
> > +
> > +#define ORB_CTRL0_MASK_KEY 0xf000
> > +#define ORB_CTRL0_MASK_SPND 0x0800
> > +#define ORB_CTRL0_MASK_STR 0x0400
> > +#define ORB_CTRL0_MASK_MOD 0x0200
> > +#define ORB_CTRL0_MASK_SYNC 0x0100
> > +#define ORB_CTRL0_MASK_FMT 0x0080
> > +#define ORB_CTRL0_MASK_PFCH 0x0040
> > +#define ORB_CTRL0_MASK_ISIC 0x0020
> > +#define ORB_CTRL0_MASK_ALCC 0x0010
> > +#define ORB_CTRL0_MASK_SSIC 0x0008
> > +#define ORB_CTRL0_MASK_C64 0x0002
> > +#define ORB_CTRL0_MASK_I2K 0x0001
> > +#define ORB_CTRL0_MASK_INVALID 0x0004
> > +
> > +#define ORB_CTRL1_MASK_ILS 0x80
> > +#define ORB_CTRL1_MASK_MIDAW 0x40
> > +#define ORB_CTRL1_MASK_ORBX 0x01
> > +#define ORB_CTRL1_MASK_INVALID 0x3e
> > +
> > +/* channel command word (type 1) */
> > +typedef struct CCW1 {
> > +    uint8_t cmd_code;
> > +    uint8_t flags;
> > +    uint16_t count;
> > +    uint32_t cda;
> > +} QEMU_PACKED CCW1;
> > +
> > +#define CCW_FLAG_DC              0x80
> > +#define CCW_FLAG_CC              0x40
> > +#define CCW_FLAG_SLI             0x20
> > +#define CCW_FLAG_SKIP            0x10
> > +#define CCW_FLAG_PCI             0x08
> > +#define CCW_FLAG_IDA             0x04
> > +#define CCW_FLAG_SUSPEND         0x02
> > +
> > +#define CCW_CMD_NOOP             0x03
> > +#define CCW_CMD_BASIC_SENSE      0x04
> > +#define CCW_CMD_TIC              0x08
> > +#define CCW_CMD_SENSE_ID         0xe4
> > +
> > +typedef struct CRW {
> > +    uint16_t flags;
> > +    uint16_t rsid;
> > +} QEMU_PACKED CRW;
> > +
> > +#define CRW_FLAGS_MASK_S 0x4000
> > +#define CRW_FLAGS_MASK_R 0x2000
> > +#define CRW_FLAGS_MASK_C 0x1000
> > +#define CRW_FLAGS_MASK_RSC 0x0f00
> > +#define CRW_FLAGS_MASK_A 0x0080
> > +#define CRW_FLAGS_MASK_ERC 0x003f
> > +
> > +#define CRW_ERC_INIT 0x02
> > +#define CRW_ERC_IPI  0x04
> > +
> > +#define CRW_RSC_SUBCH 0x3
> > +#define CRW_RSC_CHP   0x4
> > +
> > +/* schid disintegration */
> > +#define IOINST_SCHID_ONE   0x00010000
> > +#define IOINST_SCHID_M     0x00080000
> > +#define IOINST_SCHID_CSSID 0xff000000
> > +#define IOINST_SCHID_SSID  0x00060000
> > +#define IOINST_SCHID_NR    0x0000ffff
> > +
> > +int ioinst_disassemble_sch_ident(uint32_t value, int *m, int *cssid, int *ssid,
> > +                                 int *schid);
> > +#endif
> > -- 
> > 1.7.12.4
> > 
>