x86: blacklist DMAR on Intel G31/G33 chipsets

[linux-2.6-omap-h63xx.git] / arch / x86 / kernel / early-quirks.c

diff --git a/arch/x86/kernel/early-quirks.c b/arch/x86/kernel/early-quirks.c
index a4665f37cfc5dc9f3d3b7097c08166d061643de6..24bb5faf5efaefedcb578d4f4f27415a015833c7 100644 (file)
--- a/arch/x86/kernel/early-quirks.c
+++ b/arch/x86/kernel/early-quirks.c
@@ -16,10 +16,7 @@
 #include <asm/dma.h>
 #include <asm/io_apic.h>
 #include <asm/apic.h>
-
-#ifdef CONFIG_GART_IOMMU
-#include <asm/gart.h>
-#endif
+#include <asm/iommu.h>
 
 static void __init fix_hypertransport_config(int num, int slot, int func)
 {
@@ -98,6 +95,20 @@ static void __init nvidia_bugs(int num, int slot, int func)
 
 }
 
+#ifdef CONFIG_DMAR
+static void __init intel_g33_dmar(int num, int slot, int func)
+{
+       struct acpi_table_header *dmar_tbl;
+       acpi_status status;
+
+       status = acpi_get_table(ACPI_SIG_DMAR, 0, &dmar_tbl);
+       if (ACPI_SUCCESS(status)) {
+               printk(KERN_INFO "BIOS BUG: DMAR advertised on Intel G31/G33 chipset -- ignoring\n");
+               dmar_disabled = 1;
+       }
+}
+#endif
+
 #define QFLAG_APPLY_ONCE       0x1
 #define QFLAG_APPLIED          0x2
 #define QFLAG_DONE             (QFLAG_APPLY_ONCE|QFLAG_APPLIED)
@@ -117,10 +128,25 @@ static struct chipset early_qrk[] __initdata = {
          PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, via_bugs },
        { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB,
          PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, fix_hypertransport_config },
+#ifdef CONFIG_DMAR
+       { PCI_VENDOR_ID_INTEL, 0x29c0,
+         PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, intel_g33_dmar },
+#endif
        {}
 };
 
-static void __init check_dev_quirk(int num, int slot, int func)
+/**
+ * check_dev_quirk - apply early quirks to a given PCI device
+ * @num: bus number
+ * @slot: slot number
+ * @func: PCI function
+ *
+ * Check the vendor & device ID against the early quirks table.
+ *
+ * If the device is single function, let early_quirks() know so we don't
+ * poke at this device again.
+ */
+static int __init check_dev_quirk(int num, int slot, int func)
 {
        u16 class;
        u16 vendor;
@@ -131,7 +157,7 @@ static void __init check_dev_quirk(int num, int slot, int func)
        class = read_pci_config_16(num, slot, func, PCI_CLASS_DEVICE);
 
        if (class == 0xffff)
-               return;
+               return -1; /* no class, treat as single function */
 
        vendor = read_pci_config_16(num, slot, func, PCI_VENDOR_ID);
 
@@ -154,7 +180,9 @@ static void __init check_dev_quirk(int num, int slot, int func)
        type = read_pci_config_byte(num, slot, func,
                                    PCI_HEADER_TYPE);
        if (!(type & 0x80))
-               return;
+               return -1;
+
+       return 0;
 }
 
 void __init early_quirks(void)
@@ -167,6 +195,9 @@ void __init early_quirks(void)
        /* Poor man's PCI discovery */
        for (num = 0; num < 32; num++)
                for (slot = 0; slot < 32; slot++)
-                       for (func = 0; func < 8; func++)
-                               check_dev_quirk(num, slot, func);
+                       for (func = 0; func < 8; func++) {
+                               /* Only probe function 0 on single fn devices */
+                               if (check_dev_quirk(num, slot, func))
+                                       break;
+                       }
 }