[ACPI] Split the ACPI Processor T-States handling into a different file

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.de>
Signed-off-by: Len Brown <len.brown@intel.com>

4 files changed, 375 insertions, 314 deletions

diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index ad2e5c75c6f6..6c72180e94b5 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -31,7 +31,7 @@ obj-$(CONFIG_ACPI_INTERPRETER)	+= osl.o utils.o \
 #
 processor_tmp-objs	+= processor.o
 ifdef CONFIG_CPU_FREQ
-processor_tmp-objs	+= processor_perflib.o
+processor_tmp-objs	+= processor_perflib.o processor_throttling.o
 endif
 
 obj-$(CONFIG_ACPI_BUS)		+= sleep/
diff --git a/drivers/acpi/processor.c b/drivers/acpi/processor.c
index ff5b1ef188f5..c9d47da02777 100644
--- a/drivers/acpi/processor.c
+++ b/drivers/acpi/processor.c
@@ -91,7 +91,6 @@ static int acpi_processor_add (struct acpi_device *device);
 static int acpi_processor_start (struct acpi_device *device);
 static int acpi_processor_remove (struct acpi_device *device, int type);
 static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
-static int acpi_processor_throttling_open_fs(struct inode *inode, struct file *file);
 static int acpi_processor_power_open_fs(struct inode *inode, struct file *file);
 static int acpi_processor_limit_open_fs(struct inode *inode, struct file *file);
 static int acpi_processor_get_limit_info(struct acpi_processor *pr);
@@ -114,16 +113,6 @@ static struct acpi_driver acpi_processor_driver = {
 #define UNINSTALL_NOTIFY_HANDLER	2
 
 
-struct acpi_processor_errata {
-	u8			smp;
-	struct {
-		u8			throttle:1;
-		u8			fdma:1;
-		u8			reserved:6;
-		u32			bmisx;
-	}			piix4;
-};
-
 static struct file_operations acpi_processor_info_fops = {
 	.open 		= acpi_processor_info_open_fs,
 	.read		= seq_read,
@@ -138,13 +127,6 @@ static struct file_operations acpi_processor_power_fops = {
 	.release	= single_release,
 };
 
-static struct file_operations acpi_processor_throttling_fops = {
-	.open 		= acpi_processor_throttling_open_fs,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
-
 static struct file_operations acpi_processor_limit_fops = {
 	.open 		= acpi_processor_limit_open_fs,
 	.read		= seq_read,
@@ -153,7 +135,7 @@ static struct file_operations acpi_processor_limit_fops = {
 };
 
 struct acpi_processor	*processors[NR_CPUS];
-static struct acpi_processor_errata errata;
+struct acpi_processor_errata errata;
 static void (*pm_idle_save)(void);
 
 
@@ -788,227 +770,6 @@ acpi_processor_get_power_info (
 }
 
 
-/* --------------------------------------------------------------------------
-                              Throttling Control
-   -------------------------------------------------------------------------- */
-
-static int
-acpi_processor_get_throttling (
-	struct acpi_processor	*pr)
-{
-	int			state = 0;
-	u32			value = 0;
-	u32			duty_mask = 0;
-	u32			duty_value = 0;
-
-	ACPI_FUNCTION_TRACE("acpi_processor_get_throttling");
-
-	if (!pr)
-		return_VALUE(-EINVAL);
-
-	if (!pr->flags.throttling)
-		return_VALUE(-ENODEV);
-
-	pr->throttling.state = 0;
-
-	local_irq_disable();
-
-	duty_mask = pr->throttling.state_count - 1;
-
-	duty_mask <<= pr->throttling.duty_offset;
-
-	value = inl(pr->throttling.address);
-
-	/*
-	 * Compute the current throttling state when throttling is enabled
-	 * (bit 4 is on).
-	 */
-	if (value & 0x10) {
-		duty_value = value & duty_mask;
-		duty_value >>= pr->throttling.duty_offset;
-
-		if (duty_value)
-			state = pr->throttling.state_count-duty_value;
-	}
-
-	pr->throttling.state = state;
-
-	local_irq_enable();
-
-	ACPI_DEBUG_PRINT((ACPI_DB_INFO, 
-		"Throttling state is T%d (%d%% throttling applied)\n",
-		state, pr->throttling.states[state].performance));
-
-	return_VALUE(0);
-}
-
-
-static int
-acpi_processor_set_throttling (
-	struct acpi_processor	*pr,
-	int			state)
-{
-	u32                     value = 0;
-	u32                     duty_mask = 0;
-	u32                     duty_value = 0;
-
-	ACPI_FUNCTION_TRACE("acpi_processor_set_throttling");
-
-	if (!pr)
-		return_VALUE(-EINVAL);
-
-	if ((state < 0) || (state > (pr->throttling.state_count - 1)))
-		return_VALUE(-EINVAL);
-
-	if (!pr->flags.throttling)
-		return_VALUE(-ENODEV);
-
-	if (state == pr->throttling.state)
-		return_VALUE(0);
-
-	local_irq_disable();
-
-	/*
-	 * Calculate the duty_value and duty_mask.
-	 */
-	if (state) {
-		duty_value = pr->throttling.state_count - state;
-
-		duty_value <<= pr->throttling.duty_offset;
-
-		/* Used to clear all duty_value bits */
-		duty_mask = pr->throttling.state_count - 1;
-
-		duty_mask <<= acpi_fadt.duty_offset;
-		duty_mask = ~duty_mask;
-	}
-
-	/*
-	 * Disable throttling by writing a 0 to bit 4.  Note that we must
-	 * turn it off before you can change the duty_value.
-	 */
-	value = inl(pr->throttling.address);
-	if (value & 0x10) {
-		value &= 0xFFFFFFEF;
-		outl(value, pr->throttling.address);
-	}
-
-	/*
-	 * Write the new duty_value and then enable throttling.  Note
-	 * that a state value of 0 leaves throttling disabled.
-	 */
-	if (state) {
-		value &= duty_mask;
-		value |= duty_value;
-		outl(value, pr->throttling.address);
-
-		value |= 0x00000010;
-		outl(value, pr->throttling.address);
-	}
-
-	pr->throttling.state = state;
-
-	local_irq_enable();
-
-	ACPI_DEBUG_PRINT((ACPI_DB_INFO, 
-		"Throttling state set to T%d (%d%%)\n", state, 
-		(pr->throttling.states[state].performance?pr->throttling.states[state].performance/10:0)));
-
-	return_VALUE(0);
-}
-
-
-static int
-acpi_processor_get_throttling_info (
-	struct acpi_processor	*pr)
-{
-	int			result = 0;
-	int			step = 0;
-	int			i = 0;
-
-	ACPI_FUNCTION_TRACE("acpi_processor_get_throttling_info");
-
-	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-		"pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n",
-		pr->throttling.address,
-		pr->throttling.duty_offset,
-		pr->throttling.duty_width));
-
-	if (!pr)
-		return_VALUE(-EINVAL);
-
-	/* TBD: Support ACPI 2.0 objects */
-
-	if (!pr->throttling.address) {
-		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n"));
-		return_VALUE(0);
-	}
-	else if (!pr->throttling.duty_width) {
-		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n"));
-		return_VALUE(0);
-	}
-	/* TBD: Support duty_cycle values that span bit 4. */
-	else if ((pr->throttling.duty_offset
-		+ pr->throttling.duty_width) > 4) {
-		ACPI_DEBUG_PRINT((ACPI_DB_WARN, "duty_cycle spans bit 4\n"));
-		return_VALUE(0);
-	}
-
-	/*
-	 * PIIX4 Errata: We don't support throttling on the original PIIX4.
-	 * This shouldn't be an issue as few (if any) mobile systems ever
-	 * used this part.
-	 */
-	if (errata.piix4.throttle) {
-		ACPI_DEBUG_PRINT((ACPI_DB_INFO, 
-			"Throttling not supported on PIIX4 A- or B-step\n"));
-		return_VALUE(0);
-	}
-
-	pr->throttling.state_count = 1 << acpi_fadt.duty_width;
-
-	/*
-	 * Compute state values. Note that throttling displays a linear power/
-	 * performance relationship (at 50% performance the CPU will consume
-	 * 50% power).  Values are in 1/10th of a percent to preserve accuracy.
-	 */
-
-	step = (1000 / pr->throttling.state_count);
-
-	for (i=0; i<pr->throttling.state_count; i++) {
-		pr->throttling.states[i].performance = step * i;
-		pr->throttling.states[i].power = step * i;
-	}
-
-	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n", 
-		pr->throttling.state_count));
-
-	pr->flags.throttling = 1;
-
-	/*
-	 * Disable throttling (if enabled).  We'll let subsequent policy (e.g. 
-	 * thermal) decide to lower performance if it so chooses, but for now 
-	 * we'll crank up the speed.
-	 */
-
-	result = acpi_processor_get_throttling(pr);
-	if (result)
-		goto end;
-
-	if (pr->throttling.state) {
-		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Disabling throttling (was T%d)\n", 
-			pr->throttling.state));
-		result = acpi_processor_set_throttling(pr, 0);
-		if (result)
-			goto end;
-	}
-
-end:
-	if (result)
-		pr->flags.throttling = 0;
-
-	return_VALUE(result);
-}
 
 
 /* --------------------------------------------------------------------------
@@ -1380,79 +1141,6 @@ static int acpi_processor_power_open_fs(struct inode *inode, struct file *file)
 						PDE(inode)->data);
 }
 
-static int acpi_processor_throttling_seq_show(struct seq_file *seq, void *offset)
-{
-	struct acpi_processor	*pr = (struct acpi_processor *)seq->private;
-	int			i = 0;
-	int                     result = 0;
-
-	ACPI_FUNCTION_TRACE("acpi_processor_throttling_seq_show");
-
-	if (!pr)
-		goto end;
-
-	if (!(pr->throttling.state_count > 0)) {
-		seq_puts(seq, "<not supported>\n");
-		goto end;
-	}
-
-	result = acpi_processor_get_throttling(pr);
-
-	if (result) {
-		seq_puts(seq, "Could not determine current throttling state.\n");
-		goto end;
-	}
-
-	seq_printf(seq, "state count:             %d\n"
-			"active state:            T%d\n",
-			pr->throttling.state_count,
-			pr->throttling.state);
-
-	seq_puts(seq, "states:\n");
-	for (i = 0; i < pr->throttling.state_count; i++)
-		seq_printf(seq, "   %cT%d:                  %02d%%\n",
-			(i == pr->throttling.state?'*':' '), i,
-			(pr->throttling.states[i].performance?pr->throttling.states[i].performance/10:0));
-
-end:
-	return_VALUE(0);
-}
-
-static int acpi_processor_throttling_open_fs(struct inode *inode, struct file *file)
-{
-	return single_open(file, acpi_processor_throttling_seq_show,
-						PDE(inode)->data);
-}
-
-static ssize_t
-acpi_processor_write_throttling (
-        struct file		*file,
-        const char		__user *buffer,
-        size_t			count,
-        loff_t			*data)
-{
-	int			result = 0;
-        struct seq_file 	*m = (struct seq_file *)file->private_data;
-	struct acpi_processor	*pr = (struct acpi_processor *)m->private;
-	char			state_string[12] = {'\0'};
-
-	ACPI_FUNCTION_TRACE("acpi_processor_write_throttling");
-
-	if (!pr || (count > sizeof(state_string) - 1))
-		return_VALUE(-EINVAL);
-	
-	if (copy_from_user(state_string, buffer, count))
-		return_VALUE(-EFAULT);
-	
-	state_string[count] = '\0';
-	
-	result = acpi_processor_set_throttling(pr, 
-		simple_strtoul(state_string, NULL, 0));
-	if (result)
-		return_VALUE(result);
-
-	return_VALUE(count);
-}
 
 static int acpi_processor_limit_seq_show(struct seq_file *seq, void *offset)
 {
diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c
new file mode 100644
index 000000000000..9670dbb5f5e8
--- /dev/null
+++ b/drivers/acpi/processor_throttling.c
@@ -0,0 +1,351 @@
+/*
+ * processor_throttling.c - Throttling submodule of the ACPI processor driver
+ *
+ *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
+ *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ *  Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
+ *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
+ *  			- Added processor hotplug support
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or (at
+ *  your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/cpufreq.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+
+#include <acpi/acpi_bus.h>
+#include <acpi/processor.h>
+
+#define ACPI_PROCESSOR_COMPONENT        0x01000000
+#define ACPI_PROCESSOR_CLASS            "processor"
+#define ACPI_PROCESSOR_DRIVER_NAME      "ACPI Processor Driver"
+#define _COMPONENT              ACPI_PROCESSOR_COMPONENT
+ACPI_MODULE_NAME                ("acpi_processor")
+
+
+/* --------------------------------------------------------------------------
+                              Throttling Control
+   -------------------------------------------------------------------------- */
+
+static int
+acpi_processor_get_throttling (
+	struct acpi_processor	*pr)
+{
+	int			state = 0;
+	u32			value = 0;
+	u32			duty_mask = 0;
+	u32			duty_value = 0;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_get_throttling");
+
+	if (!pr)
+		return_VALUE(-EINVAL);
+
+	if (!pr->flags.throttling)
+		return_VALUE(-ENODEV);
+
+	pr->throttling.state = 0;
+
+	local_irq_disable();
+
+	duty_mask = pr->throttling.state_count - 1;
+
+	duty_mask <<= pr->throttling.duty_offset;
+
+	value = inl(pr->throttling.address);
+
+	/*
+	 * Compute the current throttling state when throttling is enabled
+	 * (bit 4 is on).
+	 */
+	if (value & 0x10) {
+		duty_value = value & duty_mask;
+		duty_value >>= pr->throttling.duty_offset;
+
+		if (duty_value)
+			state = pr->throttling.state_count-duty_value;
+	}
+
+	pr->throttling.state = state;
+
+	local_irq_enable();
+
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+		"Throttling state is T%d (%d%% throttling applied)\n",
+		state, pr->throttling.states[state].performance));
+
+	return_VALUE(0);
+}
+
+
+int acpi_processor_set_throttling (
+	struct acpi_processor	*pr,
+	int			state)
+{
+	u32                     value = 0;
+	u32                     duty_mask = 0;
+	u32                     duty_value = 0;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_set_throttling");
+
+	if (!pr)
+		return_VALUE(-EINVAL);
+
+	if ((state < 0) || (state > (pr->throttling.state_count - 1)))
+		return_VALUE(-EINVAL);
+
+	if (!pr->flags.throttling)
+		return_VALUE(-ENODEV);
+
+	if (state == pr->throttling.state)
+		return_VALUE(0);
+
+	local_irq_disable();
+
+	/*
+	 * Calculate the duty_value and duty_mask.
+	 */
+	if (state) {
+		duty_value = pr->throttling.state_count - state;
+
+		duty_value <<= pr->throttling.duty_offset;
+
+		/* Used to clear all duty_value bits */
+		duty_mask = pr->throttling.state_count - 1;
+
+		duty_mask <<= acpi_fadt.duty_offset;
+		duty_mask = ~duty_mask;
+	}
+
+	/*
+	 * Disable throttling by writing a 0 to bit 4.  Note that we must
+	 * turn it off before you can change the duty_value.
+	 */
+	value = inl(pr->throttling.address);
+	if (value & 0x10) {
+		value &= 0xFFFFFFEF;
+		outl(value, pr->throttling.address);
+	}
+
+	/*
+	 * Write the new duty_value and then enable throttling.  Note
+	 * that a state value of 0 leaves throttling disabled.
+	 */
+	if (state) {
+		value &= duty_mask;
+		value |= duty_value;
+		outl(value, pr->throttling.address);
+
+		value |= 0x00000010;
+		outl(value, pr->throttling.address);
+	}
+
+	pr->throttling.state = state;
+
+	local_irq_enable();
+
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+		"Throttling state set to T%d (%d%%)\n", state,
+		(pr->throttling.states[state].performance?pr->throttling.states[state].performance/10:0)));
+
+	return_VALUE(0);
+}
+
+
+int
+acpi_processor_get_throttling_info (
+	struct acpi_processor	*pr)
+{
+	int			result = 0;
+	int			step = 0;
+	int			i = 0;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_get_throttling_info");
+
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+		"pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n",
+		pr->throttling.address,
+		pr->throttling.duty_offset,
+		pr->throttling.duty_width));
+
+	if (!pr)
+		return_VALUE(-EINVAL);
+
+	/* TBD: Support ACPI 2.0 objects */
+
+	if (!pr->throttling.address) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n"));
+		return_VALUE(0);
+	}
+	else if (!pr->throttling.duty_width) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n"));
+		return_VALUE(0);
+	}
+	/* TBD: Support duty_cycle values that span bit 4. */
+	else if ((pr->throttling.duty_offset
+		+ pr->throttling.duty_width) > 4) {
+		ACPI_DEBUG_PRINT((ACPI_DB_WARN, "duty_cycle spans bit 4\n"));
+		return_VALUE(0);
+	}
+
+	/*
+	 * PIIX4 Errata: We don't support throttling on the original PIIX4.
+	 * This shouldn't be an issue as few (if any) mobile systems ever
+	 * used this part.
+	 */
+	if (errata.piix4.throttle) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+			"Throttling not supported on PIIX4 A- or B-step\n"));
+		return_VALUE(0);
+	}
+
+	pr->throttling.state_count = 1 << acpi_fadt.duty_width;
+
+	/*
+	 * Compute state values. Note that throttling displays a linear power/
+	 * performance relationship (at 50% performance the CPU will consume
+	 * 50% power).  Values are in 1/10th of a percent to preserve accuracy.
+	 */
+
+	step = (1000 / pr->throttling.state_count);
+
+	for (i=0; i<pr->throttling.state_count; i++) {
+		pr->throttling.states[i].performance = step * i;
+		pr->throttling.states[i].power = step * i;
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n",
+		pr->throttling.state_count));
+
+	pr->flags.throttling = 1;
+
+	/*
+	 * Disable throttling (if enabled).  We'll let subsequent policy (e.g.
+	 * thermal) decide to lower performance if it so chooses, but for now
+	 * we'll crank up the speed.
+	 */
+
+	result = acpi_processor_get_throttling(pr);
+	if (result)
+		goto end;
+
+	if (pr->throttling.state) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Disabling throttling (was T%d)\n",
+			pr->throttling.state));
+		result = acpi_processor_set_throttling(pr, 0);
+		if (result)
+			goto end;
+	}
+
+end:
+	if (result)
+		pr->flags.throttling = 0;
+
+	return_VALUE(result);
+}
+
+
+/* proc interface */
+
+static int acpi_processor_throttling_seq_show(struct seq_file *seq, void *offset)
+{
+	struct acpi_processor	*pr = (struct acpi_processor *)seq->private;
+	int			i = 0;
+	int                     result = 0;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_throttling_seq_show");
+
+	if (!pr)
+		goto end;
+
+	if (!(pr->throttling.state_count > 0)) {
+		seq_puts(seq, "<not supported>\n");
+		goto end;
+	}
+
+	result = acpi_processor_get_throttling(pr);
+
+	if (result) {
+		seq_puts(seq, "Could not determine current throttling state.\n");
+		goto end;
+	}
+
+	seq_printf(seq, "state count:             %d\n"
+			"active state:            T%d\n",
+			pr->throttling.state_count,
+			pr->throttling.state);
+
+	seq_puts(seq, "states:\n");
+	for (i = 0; i < pr->throttling.state_count; i++)
+		seq_printf(seq, "   %cT%d:                  %02d%%\n",
+			(i == pr->throttling.state?'*':' '), i,
+			(pr->throttling.states[i].performance?pr->throttling.states[i].performance/10:0));
+
+end:
+	return_VALUE(0);
+}
+
+int acpi_processor_throttling_open_fs(struct inode *inode, struct file *file)
+{
+	return single_open(file, acpi_processor_throttling_seq_show,
+						PDE(inode)->data);
+}
+
+ssize_t acpi_processor_write_throttling (
+        struct file		*file,
+        const char		__user *buffer,
+        size_t			count,
+        loff_t			*data)
+{
+	int			result = 0;
+        struct seq_file 	*m = (struct seq_file *)file->private_data;
+	struct acpi_processor	*pr = (struct acpi_processor *)m->private;
+	char			state_string[12] = {'\0'};
+
+	ACPI_FUNCTION_TRACE("acpi_processor_write_throttling");
+
+	if (!pr || (count > sizeof(state_string) - 1))
+		return_VALUE(-EINVAL);
+
+	if (copy_from_user(state_string, buffer, count))
+		return_VALUE(-EFAULT);
+
+	state_string[count] = '\0';
+
+	result = acpi_processor_set_throttling(pr,
+		simple_strtoul(state_string, NULL, 0));
+	if (result)
+		return_VALUE(result);
+
+	return_VALUE(count);
+}
+
+struct file_operations acpi_processor_throttling_fops = {
+	.open 		= acpi_processor_throttling_open_fs,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index 1978e37703c8..6e3465d3b2cc 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -134,6 +134,16 @@ struct acpi_processor {
 	struct acpi_processor_limit limit;
 };
 
+struct acpi_processor_errata {
+	u8			smp;
+	struct {
+		u8			throttle:1;
+		u8			fdma:1;
+		u8			reserved:6;
+		u32			bmisx;
+	}			piix4;
+};
+
 extern int acpi_processor_register_performance (
 	struct acpi_processor_performance * performance,
 	unsigned int cpu);
@@ -149,6 +159,7 @@ int acpi_processor_notify_smm(struct module *calling_module);
 
 /* for communication between multiple parts of the processor kernel module */
 extern struct acpi_processor	*processors[NR_CPUS];
+extern struct acpi_processor_errata errata;
 
 /* in processor_perflib.c */
 #ifdef CONFIG_CPU_FREQ
@@ -169,4 +180,15 @@ static inline int acpi_processor_ppc_has_changed(struct acpi_processor *pr) {
 }
 #endif /* CONFIG_CPU_FREQ */
 
+/* in processor_throttling.c */
+int acpi_processor_get_throttling_info (struct acpi_processor *pr);
+int acpi_processor_set_throttling (struct acpi_processor *pr, int state);
+int acpi_processor_throttling_open_fs(struct inode *inode, struct file *file);
+ssize_t acpi_processor_write_throttling (
+        struct file		*file,
+        const char		__user *buffer,
+        size_t			count,
+        loff_t			*data);
+extern struct file_operations acpi_processor_throttling_fops;
+
 #endif