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Date: Thu, 10 Jan 2008 22:41:58 +0800
From: "peerchen" <peerchen@...il.com>
To: "linux-kernel" <linux-kernel@...r.kernel.org>
Cc: "akpm" <akpm@...ux-foundation.org>,
"ebiederm" <ebiederm@...ssion.com>, "acurrid" <acurrid@...dia.com>,
"pchen" <pchen@...dia.com>
Subject: [PATCH]quirks: set 'En' bit of MSI Mapping for devices on HT-based nvidia platform
Signed-off-by: Andy Currid <acurrid@...dia.com>
Signed-off-by: Peer Chen <pchen@...dia.com>
---
--- linux-2.6.24-rc7/drivers/pci/quirks.c.orig 2008-01-09 16:37:36.000000000 -0500
+++ linux-2.6.24-rc7/drivers/pci/quirks.c 2008-01-10 15:03:09.000000000 -0500
@@ -1705,6 +1705,70 @@ static void __devinit quirk_nvidia_ck804
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_CK804_PCIE,
quirk_nvidia_ck804_msi_ht_cap);
+/*
+ * Force enable MSI mapping capability on HT bridges */
+static inline void ht_enable_msi_mapping(struct pci_dev *dev)
+{
+ int pos, ttl = 48;
+
+ pos = pci_find_ht_capability(dev, HT_CAPTYPE_MSI_MAPPING);
+ while (pos && ttl--) {
+ u8 flags;
+
+ if (pci_read_config_byte(dev, pos + HT_MSI_FLAGS, &flags) == 0) {
+ printk(KERN_INFO "PCI: Enabling HT MSI Mapping on %s\n",
+ dev->dev.bus_id);
+
+ pci_write_config_byte(dev, pos + HT_MSI_FLAGS,
+ flags | HT_MSI_FLAGS_ENABLE);
+ }
+ pos = pci_find_next_ht_capability(dev, pos,
+ HT_CAPTYPE_MSI_MAPPING);
+ }
+}
+
+static void __devinit nv_msi_ht_cap_quirk(struct pci_dev *dev) {
+
+ struct pci_dev *host_bridge;
+ int pos, ttl = 48;
+
+ /* HT MSI mapping should be disabled on devices that are below
+ * a non-Hypertransport host bridge. Locate the host bridge...
+ */
+
+ if ((host_bridge = pci_get_bus_and_slot(0, PCI_DEVFN(0,0))) == NULL) {
+ printk(KERN_WARNING
+ "PCI: nv_msi_ht_cap_quirk didn't locate host bridge\n");
+ return;
+ }
+
+ if ((pos = pci_find_ht_capability(host_bridge, HT_CAPTYPE_SLAVE)) != 0) {
+ /* Host bridge is to HT */
+ ht_enable_msi_mapping(dev);
+ return;
+ }
+
+ /* Host bridge is not to HT, disable HT MSI mapping on this device */
+
+ pos = pci_find_ht_capability(dev, HT_CAPTYPE_MSI_MAPPING);
+ while (pos && ttl--) {
+ u8 flags;
+
+ if (pci_read_config_byte(dev, pos + HT_MSI_FLAGS, &flags) == 0) {
+ printk(KERN_INFO "PCI: Quirk disabling HT MSI mapping on %s\n",
+ pci_name(dev));
+
+ pci_write_config_byte(dev, pos + HT_MSI_FLAGS,
+ flags & ~HT_MSI_FLAGS_ENABLE);
+ }
+ pos = pci_find_next_ht_capability(dev, pos,
+ HT_CAPTYPE_MSI_MAPPING);
+ }
+}
+
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,
+ nv_msi_ht_cap_quirk);
+
static void __devinit quirk_msi_intx_disable_bug(struct pci_dev *dev)
{
dev->dev_flags |= PCI_DEV_FLAGS_MSI_INTX_DISABLE_BUG;
-
--
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