[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 <[email protected]>
---
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 {
-
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