On Thu, 01 Dec 2011 13:04:15 +0100 Jan Kiszka <jan.kiszka@xxxxxxxxxxx> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
