pci: implement "pci=noaer"

For cases in which CONFIG_PCIEAER=y (such as distro kernels), allow users
to disable PCIE Advanced Error Reporting by using "pci=noaer" on the
kernel command line.

This can be used to work around hardware or (kernel) software problems.

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 19a64a3..2dd5c28 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1586,6 +1586,8 @@
 		if (*str && (str = pcibios_setup(str)) && *str) {
 			if (!strcmp(str, "nomsi")) {
 				pci_no_msi();
+			} else if (!strcmp(str, "noaer")) {
+				pci_no_aer();
 			} else if (!strncmp(str, "cbiosize=", 9)) {
 				pci_cardbus_io_size = memparse(str + 9, &str);
 			} else if (!strncmp(str, "cbmemsize=", 10)) {
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 4c36e80..5360d73 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -52,6 +52,12 @@
 static inline void pci_restore_msi_state(struct pci_dev *dev) {}
 #endif
 
+#ifdef CONFIG_PCIEAER
+void pci_no_aer(void);
+#else
+static inline void pci_no_aer(void) { }
+#endif
+
 static inline int pci_no_d1d2(struct pci_dev *dev)
 {
 	unsigned int parent_dstates = 0;
diff --git a/drivers/pci/pcie/aer/aerdrv.c b/drivers/pci/pcie/aer/aerdrv.c
index ad90a01..7a62f7d 100644
--- a/drivers/pci/pcie/aer/aerdrv.c
+++ b/drivers/pci/pcie/aer/aerdrv.c
@@ -81,6 +81,13 @@
 	.reset_link	= aer_root_reset,
 };
 
+static int pcie_aer_disable;
+
+void pci_no_aer(void)
+{
+	pcie_aer_disable = 1;	/* has priority over 'forceload' */
+}
+
 /**
  * aer_irq - Root Port's ISR
  * @irq: IRQ assigned to Root Port
@@ -327,6 +334,8 @@
  **/
 static int __init aer_service_init(void)
 {
+	if (pcie_aer_disable)
+		return -ENXIO;
 	return pcie_port_service_register(&aerdriver);
 }