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    Subject[PATCH 1/4] s390/pci: track alignment/length strictness for zpci_dev
    Date
    Some zpci device types (e.g., ISM) follow different rules for length
    and alignment of pci instructions. Recognize this and keep track of
    it in the zpci_dev.

    Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
    Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
    Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
    ---
    arch/s390/include/asm/pci.h | 3 ++-
    arch/s390/include/asm/pci_clp.h | 4 +++-
    arch/s390/pci/pci_clp.c | 1 +
    3 files changed, 6 insertions(+), 2 deletions(-)

    diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
    index 2126289..f16ffba 100644
    --- a/arch/s390/include/asm/pci.h
    +++ b/arch/s390/include/asm/pci.h
    @@ -133,7 +133,8 @@ struct zpci_dev {
    u8 has_hp_slot : 1;
    u8 is_physfn : 1;
    u8 util_str_avail : 1;
    - u8 reserved : 4;
    + u8 relaxed_align : 1;
    + u8 reserved : 3;
    unsigned int devfn; /* DEVFN part of the RID*/

    struct mutex lock;
    diff --git a/arch/s390/include/asm/pci_clp.h b/arch/s390/include/asm/pci_clp.h
    index 1f4b666..9fb7cbf 100644
    --- a/arch/s390/include/asm/pci_clp.h
    +++ b/arch/s390/include/asm/pci_clp.h
    @@ -150,7 +150,9 @@ struct clp_rsp_query_pci_grp {
    u16 : 4;
    u16 noi : 12; /* number of interrupts */
    u8 version;
    - u8 : 6;
    + u8 : 4;
    + u8 relaxed_align : 1; /* Relax length and alignment rules */
    + u8 : 1;
    u8 frame : 1;
    u8 refresh : 1; /* TLB refresh mode */
    u16 reserved2;
    diff --git a/arch/s390/pci/pci_clp.c b/arch/s390/pci/pci_clp.c
    index 153720d..630f8fc 100644
    --- a/arch/s390/pci/pci_clp.c
    +++ b/arch/s390/pci/pci_clp.c
    @@ -103,6 +103,7 @@ static void clp_store_query_pci_fngrp(struct zpci_dev *zdev,
    zdev->max_msi = response->noi;
    zdev->fmb_update = response->mui;
    zdev->version = response->version;
    + zdev->relaxed_align = response->relaxed_align;

    switch (response->version) {
    case 1:
    --
    1.8.3.1
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