===================================================================
@@ -53,12 +53,22 @@ static bool pcie_pme_disabled;
*/
static bool pcie_pme_force_enable;
+/*
+ * If this switch is set, MSI will not be used for PCIe PME signaling. This
+ * causes the PCIe port driver to use INTx interrupts only, but it turns out
+ * that using MSI for PCIe PME signaling doesn't play well with PCIe PME-based
+ * wake-up from system sleep states.
+ */
+bool pcie_pme_msi_disabled;
+
static int __init pcie_pme_setup(char *str)
{
if (!strcmp(str, "off"))
pcie_pme_disabled = true;
else if (!strcmp(str, "force"))
pcie_pme_force_enable = true;
+ else if (!strcmp(str, "nomsi"))
+ pcie_pme_msi_disabled = true;
return 1;
}
__setup("pcie_pme=", pcie_pme_setup);
@@ -73,7 +83,9 @@ __setup("pcie_pme=", pcie_pme_setup);
*/
static bool pcie_pme_platform_setup(struct pcie_device *srv)
{
- return !pcie_pme_platform_notify(srv) || pcie_pme_force_enable;
+ if (!pcie_pme_platform_notify(srv))
+ return true;
+ return pcie_pme_force_enable;
}
struct pcie_pme_service_data {
===================================================================
@@ -190,6 +190,10 @@ static int assign_interrupt_mode(struct
int irq, interrupt_mode = PCIE_PORT_NO_IRQ;
int i;
+ /* We have to use INTx if MSI cannot be used for PCIe PME. */
+ if ((mask & PCIE_PORT_SERVICE_PME) && pcie_pme_no_msi())
+ goto no_msi;
+
/* Try to use MSI-X if supported */
if (!pcie_port_enable_msix(dev, vectors, mask))
return PCIE_PORT_MSIX_MODE;
@@ -198,6 +202,7 @@ static int assign_interrupt_mode(struct
if (!pci_enable_msi(dev))
interrupt_mode = PCIE_PORT_MSI_MODE;
+ no_msi:
if (interrupt_mode == PCIE_PORT_NO_IRQ && dev->pin)
interrupt_mode = PCIE_PORT_INTx_MODE;
===================================================================
@@ -15,6 +15,7 @@
#include <linux/slab.h>
#include <linux/pcieport_if.h>
#include <linux/aer.h>
+#include <linux/dmi.h>
#include "portdrv.h"
#include "aer/aerdrv.h"
@@ -272,10 +273,35 @@ static struct pci_driver pcie_portdriver
.driver.pm = PCIE_PORTDRV_PM_OPS,
};
+static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d)
+{
+ pr_notice("%s detected: will not use MSI for PCIe PME signaling\n",
+ d->ident);
+ pcie_pme_disable_msi();
+ return 0;
+}
+
+static struct dmi_system_id __initdata pcie_portdrv_dmi_table[] = {
+ /*
+ * Boxes that should not use MSI for PCIe PME signaling.
+ */
+ {
+ .callback = dmi_pcie_pme_disable_msi,
+ .ident = "MSI Wind U-100",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR,
+ "MICRO-STAR INTERNATIONAL CO., LTD"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "U-100"),
+ },
+ },
+};
+
static int __init pcie_portdrv_init(void)
{
int retval;
+ dmi_check_system(pcie_portdrv_dmi_table);
+
retval = pcie_port_bus_register();
if (retval) {
printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
===================================================================
@@ -45,4 +45,21 @@ extern void pcie_port_device_remove(stru
extern int __must_check pcie_port_bus_register(void);
extern void pcie_port_bus_unregister(void);
+#ifdef CONFIG_PCIE_PME
+extern bool pcie_pme_msi_disabled;
+
+static inline void pcie_pme_disable_msi(void)
+{
+ pcie_pme_msi_disabled = true;
+}
+
+static inline bool pcie_pme_no_msi(void)
+{
+ return pcie_pme_msi_disabled;
+}
+#else /* !CONFIG_PCIE_PME */
+static inline void pcie_pme_disable_msi(void) {}
+static inline bool pcie_pme_no_msi(void) { return false; }
+#endif /* !CONFIG_PCIE_PME */
+
#endif /* _PORTDRV_H_ */
===================================================================
@@ -1971,6 +1971,8 @@ and is between 256 and 4096 characters.
force Use native PCIe PME signaling even if the BIOS refuses
to allow the kernel to control the relevant PCIe config
registers.
+ nomsi Do not use MSI for native PCIe PME signaling (this makes
+ all PCIe root ports use INTx for everything).
pcmv= [HW,PCMCIA] BadgePAD 4