On Mon, Sep 12, 2011 at 06:54:01PM +0200, Jan Kiszka wrote: > 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. > > Not sure who may want to take this, so I'm CC'ing broadly. > > CC: Brian King <brking@xxxxxxxxxxxxxxxxxx> > > 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 For the series: Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx> > drivers/pci/access.c | 76 +++++++++++++++++---------- > drivers/pci/iov.c | 12 ++-- > drivers/pci/pci.c | 114 ++++++++++++++++++++++++++++++++++++++++- > drivers/pci/pci.h | 2 + > drivers/scsi/ipr.c | 66 +++++++++++++++++++++--- > drivers/scsi/ipr.h | 1 + > drivers/uio/uio_pci_generic.c | 82 +++--------------------------- > include/linux/pci.h | 17 ++++-- > 8 files changed, 248 insertions(+), 122 deletions(-) > > -- > 1.7.3.4 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
