PCI AER: software error injection

Debugging PCIE AER code can be very difficult because it is hard
to trigger various real hardware errors. This patch provide a
software based error injection tool, which can fake various PCIE
errors with a user space helper tool named "aer-inject". Which
can be gotten from:

  http://www.kernel.org/pub/linux/kernel/people/yhuang/

The patch fakes AER error by faking some PCIE AER related
registers and an AER interrupt for specified the PCIE device.
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

Documentation/PCI/pcieaer-howto.txt

@@ -267,7 +267,7 @@ After reboot with new kernel or insert the module, a device file named
 
 Then, you need a user space tool named aer-inject, which can be gotten
 from:
-    http://www.kernel.org/pub/linux/kernel/people/yhuang/
+    http://www.kernel.org/pub/linux/utils/pci/aer-inject/
 
 More information about aer-inject can be found in the document comes
 with its source code.

drivers/pci/pcie/aer/Kconfig

@@ -23,3 +23,5 @@ config PCIE_ECRC
 	  (transaction layer end-to-end CRC checking).
 
 	  When in doubt, say N.
+
+source "drivers/pci/pcie/aer/Kconfig.debug"

drivers/pci/pcie/aer/Kconfig.debug

+#
+# PCI Express Root Port Device AER Debug Configuration
+#
+
+config PCIEAER_INJECT
+	tristate "PCIE AER error injector support"
+	depends on PCIEAER
+	default n
+	help
+	  This enables PCI Express Root Port Advanced Error Reporting
+	  (AER) software error injector.
+
+	  Debuging PCIE AER code is quite difficult because it is hard
+	  to trigger various real hardware errors. Software based
+	  error injection can fake almost all kinds of errors with the
+	  help of a user space helper tool aer-inject, which can be
+	  gotten from:
+	     http://www.kernel.org/pub/linux/utils/pci/aer-inject/

drivers/pci/pcie/aer/Makefile

@@ -9,3 +9,4 @@ obj-$(CONFIG_PCIE_ECRC)	+= ecrc.o
 aerdriver-objs := aerdrv_errprint.o aerdrv_core.o aerdrv.o
 aerdriver-$(CONFIG_ACPI) += aerdrv_acpi.o
 
+obj-$(CONFIG_PCIEAER_INJECT) += aer_inject.o