1 files changed, 122 insertions, 0 deletions

diff --git a/arch/x86_64/kernel/early-quirks.c b/arch/x86_64/kernel/early-quirks.c
new file mode 100644
index 000000000000..208e38a372c1
--- /dev/null
+++ b/arch/x86_64/kernel/early-quirks.c
@@ -0,0 +1,122 @@
+/* Various workarounds for chipset bugs.
+   This code runs very early and can't use the regular PCI subsystem
+   The entries are keyed to PCI bridges which usually identify chipsets
+   uniquely.
+   This is only for whole classes of chipsets with specific problems which
+   need early invasive action (e.g. before the timers are initialized).
+   Most PCI device specific workarounds can be done later and should be
+   in standard PCI quirks
+   Mainboard specific bugs should be handled by DMI entries.
+   CPU specific bugs in setup.c */
+
+#include <linux/pci.h>
+#include <linux/acpi.h>
+#include <linux/pci_ids.h>
+#include <asm/pci-direct.h>
+#include <asm/proto.h>
+#include <asm/dma.h>
+
+static void via_bugs(void)
+{
+#ifdef CONFIG_IOMMU
+        if ((end_pfn > MAX_DMA32_PFN ||  force_iommu) &&
+            !iommu_aperture_allowed) {
+                printk(KERN_INFO
+  "Looks like a VIA chipset. Disabling IOMMU. Override with iommu=allowed\n");
+                iommu_aperture_disabled = 1;
+        }
+#endif
+}
+
+#ifdef CONFIG_ACPI
+
+static int nvidia_hpet_detected __initdata;
+
+static int __init nvidia_hpet_check(unsigned long phys, unsigned long size)
+{
+        nvidia_hpet_detected = 1;
+        return 0;
+}
+#endif
+
+static void nvidia_bugs(void)
+{
+#ifdef CONFIG_ACPI
+        /*
+         * All timer overrides on Nvidia are
+         * wrong unless HPET is enabled.
+         */
+        nvidia_hpet_detected = 0;
+        acpi_table_parse(ACPI_HPET, nvidia_hpet_check);
+        if (nvidia_hpet_detected == 0) {
+                acpi_skip_timer_override = 1;
+                printk(KERN_INFO "Nvidia board "
+                       "detected. Ignoring ACPI "
+                       "timer override.\n");
+        }
+#endif
+        /* RED-PEN skip them on mptables too? */
+
+}
+
+static void ati_bugs(void)
+{
+#if 1 /* for testing */
+        printk("ATI board detected\n");
+#endif
+        /* No bugs right now */
+}
+
+struct chipset {
+        u16 vendor;
+        void (*f)(void);
+};
+
+static struct chipset early_qrk[] = {
+        { PCI_VENDOR_ID_NVIDIA, nvidia_bugs },
+        { PCI_VENDOR_ID_VIA, via_bugs },
+        { PCI_VENDOR_ID_ATI, ati_bugs },
+        {}
+};
+
+void __init early_quirks(void)
+{
+        int num, slot, func;
+
+        if (!early_pci_allowed())
+                return;
+
+        /* Poor man's PCI discovery */
+        for (num = 0; num < 32; num++) {
+                for (slot = 0; slot < 32; slot++) {
+                        for (func = 0; func < 8; func++) {
+                                u32 class;
+                                u32 vendor;
+                                u8 type;
+                                int i;
+                                class = read_pci_config(num,slot,func,
+                                                        PCI_CLASS_REVISION);
+                                if (class == 0xffffffff)
+                                        break;
+
+                                if ((class >> 16) != PCI_CLASS_BRIDGE_PCI)
+                                        continue;
+
+                                vendor = read_pci_config(num, slot, func,
+                                                         PCI_VENDOR_ID);
+                                vendor &= 0xffff;
+
+                                for (i = 0; early_qrk[i].f; i++)
+                                        if (early_qrk[i].vendor == vendor) {
+                                                early_qrk[i].f();
+                                                return;
+                                        }
+
+                                type = read_pci_config_byte(num, slot, func,
+                                                            PCI_HEADER_TYPE);
+                                if (!(type & 0x80))
+                                        break;
+                        }
+                }
+        }
+}