[PATCH 5/8] Whitelist non-PCI-E chipsets that are known to support MSI

[Brice Goglin <brice@myri.com>]

[PATCH 5/8] Whitelist non-PCI-E chipsets that are known to support MSI

With MSI being disabled by default on non-PCI-E chipsets, we have
to explicitely whitelist chipsets that support MSI and set the
PCI_BUS_FLAGS_MSI flag.
Add a generic quirk quirk_msi_supported() to do so, and enable it
for all Intel chipsets.

Signed-off-by: Brice Goglin <brice@myri.com>
---
 drivers/pci/quirks.c |   12 ++++++++++++
 include/linux/pci.h  |    1 +
 2 files changed, 13 insertions(+)

Index: linux-mm/drivers/pci/quirks.c
===================================================================
--- linux-mm.orig/drivers/pci/quirks.c	2006-06-17 23:07:41.000000000 -0400
+++ linux-mm/drivers/pci/quirks.c	2006-06-17 23:11:01.000000000 -0400
@@ -1556,6 +1556,18 @@
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,	0x1460,		quirk_p64h2_1k_io);
 
+/* Mark MSI bus flags on chipset that are known to support it */
+static void __devinit quirk_msi_supported(struct pci_dev *dev)
+{
+	if (dev->subordinate) {
+		printk(KERN_WARNING "PCI: MSI quirk detected. "
+		       "PCI_BUS_FLAGS_MSI set for %s subordinate bus.\n",
+		       pci_name(dev));
+		dev->subordinate->bus_flags |= PCI_BUS_FLAGS_MSI;
+	}
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, quirk_msi_supported);
+
 /* Returns 1 if the HT MSI capability is found and enabled */
 static pci_bus_flags_t __devinit msi_ht_cap_enabled(struct pci_dev *dev)
 {
Index: linux-mm/include/linux/pci.h
===================================================================
--- linux-mm.orig/include/linux/pci.h	2006-06-17 22:11:04.000000000 -0400
+++ linux-mm/include/linux/pci.h	2006-06-17 23:11:30.000000000 -0400
@@ -97,6 +97,7 @@
 typedef unsigned short __bitwise pci_bus_flags_t;
 enum pci_bus_flags {
 	PCI_BUS_FLAGS_NO_MSI = (__force pci_bus_flags_t) 1,
+	PCI_BUS_FLAGS_MSI = (__force pci_bus_flags_t) 2,
 };
 
 struct pci_cap_saved_state {