lkml.org 
[lkml]   [2011]   [Nov]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    Subject[PATCH v2 0/3] PCI: Rework config space locking, add INTx masking services
    Date
    [ Rebase of v1 over yesterday's linux-next ]

    This series tries to heal the currently broken locking scheme around PCI
    config space accesses.

    We have an interface lock out access via sysfs, but that service wrongly
    assumes it is only called by one instance at a time for some device. So
    two loops doing

    echo 1 > /sys/bus/pci/devices/<some-device>/reset

    in parallel will trigger a kernel BUG at the moment.

    Besides synchronizing with user space, we also need to manage config
    space access of generic PCI drivers. They need to mask legacy interrupt
    lines while the specific driver runs in user space or a guest OS.

    The approach taken here is provide mutex-like locking for general
    access - which still requires a special mechanism due to requirements of
    the IBM Power RAID SCSI driver. Furthermore, INTx masking is now
    available via the PCI core and synchronized via the internal pci_lock.

    Jan Kiszka (3):
    pci: Rework config space blocking services
    pci: Introduce INTx check & mask API
    uio: Convert uio_generic_pci to new intx masking API

    drivers/pci/access.c | 76 +++++++++++++++++----------
    drivers/pci/iov.c | 12 ++--
    drivers/pci/pci.c | 114 ++++++++++++++++++++++++++++++++++++++++-
    drivers/pci/pci.h | 2 +
    drivers/scsi/ipr.c | 67 +++++++++++++++++++++---
    drivers/scsi/ipr.h | 1 +
    drivers/uio/uio_pci_generic.c | 76 ++-------------------------
    include/linux/pci.h | 17 ++++--
    8 files changed, 248 insertions(+), 117 deletions(-)

    --
    1.7.3.4



    \
     
     \ /
      Last update: 2011-11-04 09:49    [W:2.251 / U:0.016 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site