[PATCH] 6700/6702PXH quirk

[Kristen Accardi <kristen.c.accardi@intel.com>]

On the 6700/6702 PXH part, a MSI may get corrupted if an ACPI hotplug
driver and SHPC driver in MSI mode are used together.  This patch will
prevent MSI from being enabled for the SHPC.  

I made this patch more generic than just shpc because I thought it was
possible that other devices in the system might need to add themselves
to the msi black list.

Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>

diff -uprN -X linux-2.6.13-rc4/Documentation/dontdiff linux-2.6.13-rc4/drivers/pci/msi.c linux-2.6.13-rc4-pxhquirk/drivers/pci/msi.c
--- linux-2.6.13-rc4/drivers/pci/msi.c	2005-07-28 15:44:44.000000000 -0700
+++ linux-2.6.13-rc4-pxhquirk/drivers/pci/msi.c	2005-08-04 12:09:44.000000000 -0700
@@ -38,6 +38,32 @@ int vector_irq[NR_VECTORS] = { [0 ... NR
 u8 irq_vector[NR_IRQ_VECTORS] = { FIRST_DEVICE_VECTOR , 0 };
 #endif
 
+
+LIST_HEAD(msi_quirk_list);
+
+struct msi_quirk 
+{
+	struct list_head list;
+	struct pci_dev *dev;
+};
+
+
+int msi_add_quirk(struct pci_dev *dev)
+{
+	struct msi_quirk *quirk;
+
+	quirk = (struct msi_quirk *) kmalloc(sizeof(*quirk), GFP_KERNEL);
+	if (!quirk)
+		return -ENOMEM;
+	
+	INIT_LIST_HEAD(&quirk->list);
+	quirk->dev = dev;
+	list_add(&quirk->list, &msi_quirk_list);
+	return 0;
+}
+
+
+
 static void msi_cache_ctor(void *p, kmem_cache_t *cache, unsigned long flags)
 {
 	memset(p, 0, NR_IRQS * sizeof(struct msi_desc));
@@ -453,7 +479,7 @@ static void enable_msi_mode(struct pci_d
 	}
 }
 
-static void disable_msi_mode(struct pci_dev *dev, int pos, int type)
+void disable_msi_mode(struct pci_dev *dev, int pos, int type)
 {
 	u16 control;
 
@@ -695,10 +721,16 @@ int pci_enable_msi(struct pci_dev* dev)
 {
 	int pos, temp, status = -EINVAL;
 	u16 control;
+	struct msi_quirk *quirk;
 
 	if (!pci_msi_enable || !dev)
  		return status;
 
+	list_for_each_entry(quirk, &msi_quirk_list, list) {
+		if (quirk->dev == dev)
+			return -EINVAL;
+	}
+
 	temp = dev->irq;
 
 	if ((status = msi_init()) < 0)
@@ -1127,3 +1159,5 @@ EXPORT_SYMBOL(pci_enable_msi);
 EXPORT_SYMBOL(pci_disable_msi);
 EXPORT_SYMBOL(pci_enable_msix);
 EXPORT_SYMBOL(pci_disable_msix);
+EXPORT_SYMBOL(disable_msi_mode);
+EXPORT_SYMBOL(msi_add_quirk);
diff -uprN -X linux-2.6.13-rc4/Documentation/dontdiff linux-2.6.13-rc4/drivers/pci/quirks.c linux-2.6.13-rc4-pxhquirk/drivers/pci/quirks.c
--- linux-2.6.13-rc4/drivers/pci/quirks.c	2005-07-28 15:44:44.000000000 -0700
+++ linux-2.6.13-rc4-pxhquirk/drivers/pci/quirks.c	2005-08-04 12:09:55.000000000 -0700
@@ -21,6 +21,10 @@
 #include <linux/acpi.h>
 #include "pci.h"
 
+
+extern void disable_msi_mode(struct pci_dev *dev, int pos, int type);
+extern int msi_add_quirk(struct pci_dev *dev);
+
 /* Deal with broken BIOS'es that neglect to enable passive release,
    which can cause problems in combination with the 82441FX/PPro MTRRs */
 static void __devinit quirk_passive_release(struct pci_dev *dev)
@@ -1267,6 +1271,30 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_IN
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_E7320_MCH,	quirk_pcie_mch );
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_E7525_MCH,	quirk_pcie_mch );
 
+
+/* 
+ * It's possible for the MSI to get corrupted if shpc and acpi
+ * are used together on certain PXH-based systems.
+ */
+static void __devinit quirk_pcie_pxh(struct pci_dev *dev)
+{
+	disable_msi_mode(dev, pci_find_capability(dev, PCI_CAP_ID_MSI),
+					PCI_CAP_ID_MSI);
+	if (!msi_add_quirk(dev)) 
+		printk(KERN_WARNING "PCI: PXH quirk detected, disabling MSI for SHPC device\n");
+	else {
+		pci_msi_quirk = 1;
+		printk(KERN_WARNING "PCI: PXH quirk detected, unable to disable MSI for SHPC device, disabling MSI for all devices\n");
+	}
+			
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_PXHD_0,	quirk_pcie_pxh);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_PXHD_1,	quirk_pcie_pxh);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_PXH_0,	quirk_pcie_pxh);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_PXH_1,	quirk_pcie_pxh);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_PXHV,	quirk_pcie_pxh);
+
+
 static void __devinit quirk_netmos(struct pci_dev *dev)
 {
 	unsigned int num_parallel = (dev->subsystem_device & 0xf0) >> 4;
diff -uprN -X linux-2.6.13-rc4/Documentation/dontdiff linux-2.6.13-rc4/include/linux/pci_ids.h linux-2.6.13-rc4-pxhquirk/include/linux/pci_ids.h
--- linux-2.6.13-rc4/include/linux/pci_ids.h	2005-07-28 15:44:44.000000000 -0700
+++ linux-2.6.13-rc4-pxhquirk/include/linux/pci_ids.h	2005-08-02 13:58:53.000000000 -0700
@@ -2281,6 +2281,11 @@
 #define PCI_VENDOR_ID_INTEL		0x8086
 #define PCI_DEVICE_ID_INTEL_EESSC	0x0008
 #define PCI_DEVICE_ID_INTEL_21145	0x0039
+#define PCI_DEVICE_ID_INTEL_PXHD_0	0x0320
+#define PCI_DEVICE_ID_INTEL_PXHD_1	0x0321
+#define PCI_DEVICE_ID_INTEL_PXH_0	0x0329
+#define PCI_DEVICE_ID_INTEL_PXH_1	0x032A
+#define PCI_DEVICE_ID_INTEL_PXHV	0x032C
 #define PCI_DEVICE_ID_INTEL_82375	0x0482
 #define PCI_DEVICE_ID_INTEL_82424	0x0483
 #define PCI_DEVICE_ID_INTEL_82378	0x0484