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Diffstat (limited to 'arch/x86/kernel/apic/x2apic_uv_x.c')
-rw-r--r--arch/x86/kernel/apic/x2apic_uv_x.c74
1 files changed, 74 insertions, 0 deletions
diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 21db3cbea7dc..4b8dbb256147 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -20,6 +20,8 @@
#include <linux/cpu.h>
#include <linux/init.h>
#include <linux/io.h>
+#include <linux/pci.h>
+#include <linux/kdebug.h>
#include <asm/uv/uv_mmrs.h>
#include <asm/uv/uv_hub.h>
@@ -34,10 +36,13 @@
DEFINE_PER_CPU(int, x2apic_extra_bits);
+#define PR_DEVEL(fmt, args...) pr_devel("%s: " fmt, __func__, args)
+
static enum uv_system_type uv_system_type;
static u64 gru_start_paddr, gru_end_paddr;
int uv_min_hub_revision_id;
EXPORT_SYMBOL_GPL(uv_min_hub_revision_id);
+static DEFINE_SPINLOCK(uv_nmi_lock);
static inline bool is_GRU_range(u64 start, u64 end)
{
@@ -71,6 +76,7 @@ static int __init uv_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
if (!strcmp(oem_id, "SGI")) {
nodeid = early_get_nodeid();
x86_platform.is_untracked_pat_range = uv_is_untracked_pat_range;
+ x86_platform.nmi_init = uv_nmi_init;
if (!strcmp(oem_table_id, "UVL"))
uv_system_type = UV_LEGACY_APIC;
else if (!strcmp(oem_table_id, "UVX"))
@@ -553,6 +559,30 @@ late_initcall(uv_init_heartbeat);
#endif /* !CONFIG_HOTPLUG_CPU */
+/* Direct Legacy VGA I/O traffic to designated IOH */
+int uv_set_vga_state(struct pci_dev *pdev, bool decode,
+ unsigned int command_bits, bool change_bridge)
+{
+ int domain, bus, rc;
+
+ PR_DEVEL("devfn %x decode %d cmd %x chg_brdg %d\n",
+ pdev->devfn, decode, command_bits, change_bridge);
+
+ if (!change_bridge)
+ return 0;
+
+ if ((command_bits & PCI_COMMAND_IO) == 0)
+ return 0;
+
+ domain = pci_domain_nr(pdev->bus);
+ bus = pdev->bus->number;
+
+ rc = uv_bios_set_legacy_vga_target(decode, domain, bus);
+ PR_DEVEL("vga decode %d %x:%x, rc: %d\n", decode, domain, bus, rc);
+
+ return rc;
+}
+
/*
* Called on each cpu to initialize the per_cpu UV data area.
* FIXME: hotplug not supported yet
@@ -569,6 +599,46 @@ void __cpuinit uv_cpu_init(void)
set_x2apic_extra_bits(uv_hub_info->pnode);
}
+/*
+ * When NMI is received, print a stack trace.
+ */
+int uv_handle_nmi(struct notifier_block *self, unsigned long reason, void *data)
+{
+ if (reason != DIE_NMI_IPI)
+ return NOTIFY_OK;
+ /*
+ * Use a lock so only one cpu prints at a time
+ * to prevent intermixed output.
+ */
+ spin_lock(&uv_nmi_lock);
+ pr_info("NMI stack dump cpu %u:\n", smp_processor_id());
+ dump_stack();
+ spin_unlock(&uv_nmi_lock);
+
+ return NOTIFY_STOP;
+}
+
+static struct notifier_block uv_dump_stack_nmi_nb = {
+ .notifier_call = uv_handle_nmi
+};
+
+void uv_register_nmi_notifier(void)
+{
+ if (register_die_notifier(&uv_dump_stack_nmi_nb))
+ printk(KERN_WARNING "UV NMI handler failed to register\n");
+}
+
+void uv_nmi_init(void)
+{
+ unsigned int value;
+
+ /*
+ * Unmask NMI on all cpus
+ */
+ value = apic_read(APIC_LVT1) | APIC_DM_NMI;
+ value &= ~APIC_LVT_MASKED;
+ apic_write(APIC_LVT1, value);
+}
void __init uv_system_init(void)
{
@@ -690,5 +760,9 @@ void __init uv_system_init(void)
uv_cpu_init();
uv_scir_register_cpu_notifier();
+ uv_register_nmi_notifier();
proc_mkdir("sgi_uv", NULL);
+
+ /* register Legacy VGA I/O redirection handler */
+ pci_register_set_vga_state(uv_set_vga_state);
}