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  1. 12 2月, 2013 1 次提交
  3. 27 12月, 2012 3 次提交
  5. 11 12月, 2012 1 次提交
  7. 08 12月, 2012 3 次提交
  9. 06 12月, 2012 3 次提交
  11. 05 12月, 2012 1 次提交
    • H
      PCI/PM: Keep runtime PM enabled for unbound PCI devices · 967577b0
      由 Huang Ying 提交于 
      For unbound PCI devices, what we need is:

 - Always in D0 state, because some devices do not work again after
   being put into D3 by the PCI bus.

 - In SUSPENDED state if allowed, so that the parent devices can still
   be put into low power state.

To satisfy these requirements, the runtime PM for the unbound PCI
devices are disabled and set to SUSPENDED state.  One issue of this
solution is that the PCI devices will be put into SUSPENDED state even
if the SUSPENDED state is forbidden via the sysfs interface
(.../power/control) of the device.  This is not an issue for most
devices, because most PCI devices are not used at all if unbound.
But there are exceptions.  For example, unbound VGA card can be used
for display, but suspending its parents makes it stop working.

To fix the issue, we keep the runtime PM enabled when the PCI devices
are unbound.  But the runtime PM callbacks will do nothing if the PCI
devices are unbound.  This way, we can put the PCI devices into
SUSPENDED state without putting the PCI devices into D3 state.

Reference: https://bugzilla.kernel.org/show_bug.cgi?id=48201Signed-off-by: NHuang Ying <ying.huang@intel.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Acked-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
CC: stable@vger.kernel.org          # v3.6+
      967577b0
  13. 01 12月, 2012 3 次提交
  15. 29 11月, 2012 4 次提交
  17. 27 11月, 2012 1 次提交
    • V
      PCI/AER: Report success only when every device has AER-aware driver · 918b4053
      由 Vijay Mohan Pandarathil 提交于 
      When an error is detected on a PCIe device which does not have an
AER-aware driver, prevent AER infrastructure from reporting
successful error recovery.

This is because the report_error_detected() function that gets
called in the first phase of recovery process allows forward
progress even when the driver for the device does not have AER
capabilities. It seems that all callbacks (in pci_error_handlers
structure) registered by drivers that gets called during error
recovery are not mandatory. So the intention of the infrastructure
design seems to be to allow forward progress even when a specific
callback has not been registered by a driver. However, if error
handler structure itself has not been registered, it doesn't make
sense to allow forward progress.

As a result of the current design, in the case of a single device
having an AER-unaware driver or in the case of any function in a
multi-function card having an AER-unaware driver, a successful
recovery is reported.

Typical scenario this happens is when a PCI device is detached
from a KVM host and the pci-stub driver on the host claims the
device. The pci-stub driver does not have error handling capabilities
but the AER infrastructure still reports that the device recovered
successfully.

The changes proposed here leaves the device(s)in an unrecovered state
if the driver for the device or for any device in the subtree
does not have error handler structure registered. This reflects
the true state of the device and prevents any partial recovery (or no
recovery at all) reported as successful.

[bhelgaas: changelog]
Signed-off-by: NVijay Mohan Pandarathil <vijaymohan.pandarathil@hp.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: NLinas Vepstas <linasvepstas@gmail.com>
Reviewed-by: NMyron Stowe <myron.stowe@redhat.com>
      918b4053
  19. 15 11月, 2012 1 次提交
  21. 14 11月, 2012 1 次提交
  23. 10 11月, 2012 6 次提交
  25. 08 11月, 2012 6 次提交
  27. 06 11月, 2012 2 次提交
  29. 04 11月, 2012 3 次提交
  31. 03 11月, 2012 1 次提交