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    SubjectRe: [PATCH v2 0/3] PCI: Rework config space locking, add INTx masking services
    On Thu, 01 Dec 2011 13:04:15 +0100
    Jan Kiszka <jan.kiszka@siemens.com> wrote:

    > On 2011-11-04 09:45, Jan Kiszka wrote:
    > > [ 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(-)
    > >
    >
    > I just received yet another request regarding the KVM feature that
    > depends on this. What's the status of these patches? Were they merged
    > into some staging tree already (didn't find any traces so far)?

    Yeah I think it's ok now; I'll give it one more look and pull it into
    -next.

    Thanks,
    Jesse


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