1
linux/drivers/pci/pcie
Rafael J. Wysocki b22c3d8275 PCI/PCIe/AER: Disable native AER service if BIOS has precedence
There is a design issue related to PCIe AER and _OSC that the BIOS
may be asked to grant control of the AER service even if some
Hardware Error Source Table (HEST) entries contain information
meaning that the BIOS really should control it.  Namely,
pcie_port_acpi_setup() calls pcie_aer_get_firmware_first() that
determines whether or not the AER service should be controlled by
the BIOS on the basis of the HEST information for the given PCIe
port.  The BIOS is asked to grant control of the AER service for
a PCIe Root Complex if pcie_aer_get_firmware_first() returns 'false'
for at least one root port in that complex, even if all of the other
root ports' HEST entries have the FIRMWARE_FIRST flag set (and none
of them has the GLOBAL flag set).  However, if the AER service is
controlled by the kernel, that may interfere with the BIOS' handling
of the error sources having the FIRMWARE_FIRST flag.  Moreover,
there may be PCIe endpoints that have the FIRMWARE_FIRST flag set in
HEST and are attached to the root ports in question, in which case it
also may be unsafe to ask the BIOS for control of the AER service.

For this reason, introduce a function checking if there's at least
one PCIe-related HEST entry with the FIRMWARE_FIRST flag set and
disable the native AER service altogether if this function returns
'true'.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2010-10-15 13:09:50 -07:00
..
aer PCI/PCIe/AER: Disable native AER service if BIOS has precedence 2010-10-15 13:09:50 -07:00
aspm.c PCI: Don't enable aspm before drivers have had a chance to veto it 2010-07-30 09:29:15 -07:00
Kconfig PCI: Default PCIe ASPM control to on and require !EMBEDDED to disable 2010-07-30 09:29:34 -07:00
Makefile PCI: PCIe: Move PCIe PME code to the pcie directory 2010-08-24 13:47:48 -07:00
pme.c PCI: PCIe: Move PCIe PME code to the pcie directory 2010-08-24 13:47:48 -07:00
portdrv_acpi.c PCI/PCIe/AER: Disable native AER service if BIOS has precedence 2010-10-15 13:09:50 -07:00
portdrv_bus.c PCI: portdrv: remove unnecessary struct pcie_port_data 2009-12-04 15:56:19 -08:00
portdrv_core.c PCI: PCIe: Disable PCIe port services during port initialization 2010-08-24 13:47:47 -07:00
portdrv_pci.c PCI: PCIe: Remove the port driver module exit routine 2010-08-24 13:47:49 -07:00
portdrv.h PCI: PCIe: Ask BIOS for control of all native services at once 2010-08-24 13:47:33 -07:00