3 files changed, 75 insertions, 8 deletions

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index a18eb7ce2236..723989d7f802 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -230,6 +230,35 @@ static void __cpuinit acpi_register_lapic(int id, u8 enabled)
 }
 
 static int __init
+acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
+{
+        struct acpi_madt_local_x2apic *processor = NULL;
+
+        processor = (struct acpi_madt_local_x2apic *)header;
+
+        if (BAD_MADT_ENTRY(processor, end))
+                return -EINVAL;
+
+        acpi_table_print_madt_entry(header);
+
+#ifdef CONFIG_X86_X2APIC
+        /*
+         * We need to register disabled CPU as well to permit
+         * counting disabled CPUs. This allows us to size
+         * cpus_possible_map more accurately, to permit
+         * to not preallocating memory for all NR_CPUS
+         * when we use CPU hotplug.
+         */
+        acpi_register_lapic(processor->local_apic_id,   /* APIC ID */
+                            processor->lapic_flags & ACPI_MADT_ENABLED);
+#else
+        printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
+#endif
+
+        return 0;
+}
+
+static int __init
 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
 {
         struct acpi_madt_local_apic *processor = NULL;
@@ -289,6 +318,25 @@ acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
 }
 
 static int __init
+acpi_parse_x2apic_nmi(struct acpi_subtable_header *header,
+                      const unsigned long end)
+{
+        struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
+
+        x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
+
+        if (BAD_MADT_ENTRY(x2apic_nmi, end))
+                return -EINVAL;
+
+        acpi_table_print_madt_entry(header);
+
+        if (x2apic_nmi->lint != 1)
+                printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
+
+        return 0;
+}
+
+static int __init
 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
 {
         struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
@@ -793,6 +841,7 @@ static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
 static int __init acpi_parse_madt_lapic_entries(void)
 {
         int count;
+        int x2count = 0;
 
         if (!cpu_has_apic)
                 return -ENODEV;
@@ -816,22 +865,28 @@ static int __init acpi_parse_madt_lapic_entries(void)
         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
                                       acpi_parse_sapic, MAX_APICS);
 
-        if (!count)
+        if (!count) {
+                x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC,
+                                                acpi_parse_x2apic, MAX_APICS);
                 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
                                               acpi_parse_lapic, MAX_APICS);
-        if (!count) {
+        }
+        if (!count && !x2count) {
                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
                 /* TBD: Cleanup to allow fallback to MPS */
                 return -ENODEV;
-        } else if (count < 0) {
+        } else if (count < 0 || x2count < 0) {
                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
                 /* TBD: Cleanup to allow fallback to MPS */
                 return count;
         }
 
+        x2count =
+            acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
+                                  acpi_parse_x2apic_nmi, 0);
         count =
             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
-        if (count < 0) {
+        if (count < 0 || x2count < 0) {
                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
                 /* TBD: Cleanup to allow fallback to MPS */
                 return count;
@@ -1470,7 +1525,7 @@ static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
 
 /*
  * If your system is blacklisted here, but you find that acpi=force
- * works for you, please contact acpi-devel@sourceforge.net
+ * works for you, please contact linux-acpi@vger.kernel.org
  */
 static struct dmi_system_id __initdata acpi_dmi_table[] = {
         /*
diff --git a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
index 05209b5cc6ca..19f6b9d27e83 100644
--- a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
+++ b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
@@ -682,6 +682,18 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
                             perf->states[i].transition_latency * 1000;
         }
 
+        /* Check for high latency (>20uS) from buggy BIOSes, like on T42 */
+        if (perf->control_register.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE &&
+            policy->cpuinfo.transition_latency > 20 * 1000) {
+                static int print_once;
+                policy->cpuinfo.transition_latency = 20 * 1000;
+                if (!print_once) {
+                        print_once = 1;
+                        printk(KERN_INFO "Capping off P-state tranision latency"
+                                " at 20 uS\n");
+                }
+        }
+
         data->max_freq = perf->states[0].core_frequency * 1000;
         /* table init */
         for (i = 0; i < perf->state_count; i++) {
diff --git a/arch/x86/kernel/cpu/cpufreq/longhaul.c b/arch/x86/kernel/cpu/cpufreq/longhaul.c
index f1c51aea064d..0bd48e65a0ca 100644
--- a/arch/x86/kernel/cpu/cpufreq/longhaul.c
+++ b/arch/x86/kernel/cpu/cpufreq/longhaul.c
@@ -305,7 +305,7 @@ retry_loop:
                 outb(3, 0x22);
         } else if ((pr != NULL) && pr->flags.bm_control) {
                 /* Disable bus master arbitration */
-                acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1);
+                acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1);
         }
         switch (longhaul_version) {
 
@@ -328,7 +328,7 @@ retry_loop:
         case TYPE_POWERSAVER:
                 if (longhaul_flags & USE_ACPI_C3) {
                         /* Don't allow wakeup */
-                        acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0);
+                        acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, 0);
                         do_powersaver(cx->address, mults_index, dir);
                 } else {
                         do_powersaver(0, mults_index, dir);
@@ -341,7 +341,7 @@ retry_loop:
                 outb(0, 0x22);
         } else if ((pr != NULL) && pr->flags.bm_control) {
                 /* Enable bus master arbitration */
-                acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0);
+                acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0);
         }
         outb(pic2_mask, 0xA1);  /* restore mask */
         outb(pic1_mask, 0x21);