1 files changed, 666 insertions, 0 deletions

diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
new file mode 100644
index 000000000000..a9a1a8fe3199
--- /dev/null
+++ b/drivers/acpi/processor_perflib.c
@@ -0,0 +1,666 @@
+/*
+ * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $)
+ *
+ *  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>
+
+#ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+
+#include <asm/uaccess.h>
+#endif
+
+#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 ACPI_PROCESSOR_FILE_PERFORMANCE	"performance"
+#define _COMPONENT		ACPI_PROCESSOR_COMPONENT
+ACPI_MODULE_NAME		("acpi_processor")
+
+
+static DECLARE_MUTEX(performance_sem);
+
+/*
+ * _PPC support is implemented as a CPUfreq policy notifier:
+ * This means each time a CPUfreq driver registered also with
+ * the ACPI core is asked to change the speed policy, the maximum
+ * value is adjusted so that it is within the platform limit.
+ *
+ * Also, when a new platform limit value is detected, the CPUfreq
+ * policy is adjusted accordingly.
+ */
+
+#define PPC_REGISTERED   1
+#define PPC_IN_USE       2
+
+static int acpi_processor_ppc_status = 0;
+
+static int acpi_processor_ppc_notifier(struct notifier_block *nb,
+	unsigned long event,
+	void *data)
+{
+	struct cpufreq_policy *policy = data;
+	struct acpi_processor *pr;
+	unsigned int ppc = 0;
+
+	down(&performance_sem);
+
+	if (event != CPUFREQ_INCOMPATIBLE)
+		goto out;
+
+	pr = processors[policy->cpu];
+	if (!pr || !pr->performance)
+		goto out;
+
+	ppc = (unsigned int) pr->performance_platform_limit;
+	if (!ppc)
+		goto out;
+
+	if (ppc > pr->performance->state_count)
+		goto out;
+
+	cpufreq_verify_within_limits(policy, 0,
+		pr->performance->states[ppc].core_frequency * 1000);
+
+ out:
+	up(&performance_sem);
+
+	return 0;
+}
+
+
+static struct notifier_block acpi_ppc_notifier_block = {
+	.notifier_call = acpi_processor_ppc_notifier,
+};
+
+
+static int
+acpi_processor_get_platform_limit (
+	struct acpi_processor*	pr)
+{
+	acpi_status		status = 0;
+	unsigned long		ppc = 0;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_get_platform_limit");
+
+	if (!pr)
+		return_VALUE(-EINVAL);
+
+	/*
+	 * _PPC indicates the maximum state currently supported by the platform
+	 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
+	 */
+	status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
+
+	if (status != AE_NOT_FOUND)
+		acpi_processor_ppc_status |= PPC_IN_USE;
+
+	if(ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PPC\n"));
+		return_VALUE(-ENODEV);
+	}
+
+	pr->performance_platform_limit = (int) ppc;
+
+	return_VALUE(0);
+}
+
+
+int acpi_processor_ppc_has_changed(
+	struct acpi_processor *pr)
+{
+	int ret = acpi_processor_get_platform_limit(pr);
+	if (ret < 0)
+		return (ret);
+	else
+		return cpufreq_update_policy(pr->id);
+}
+
+
+void acpi_processor_ppc_init(void) {
+	if (!cpufreq_register_notifier(&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
+		acpi_processor_ppc_status |= PPC_REGISTERED;
+	else
+		printk(KERN_DEBUG "Warning: Processor Platform Limit not supported.\n");
+}
+
+
+void acpi_processor_ppc_exit(void) {
+	if (acpi_processor_ppc_status & PPC_REGISTERED)
+		cpufreq_unregister_notifier(&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER);
+
+	acpi_processor_ppc_status &= ~PPC_REGISTERED;
+}
+
+/*
+ * when registering a cpufreq driver with this ACPI processor driver, the
+ * _PCT and _PSS structures are read out and written into struct
+ * acpi_processor_performance.
+ */
+static int acpi_processor_set_pdc (struct acpi_processor *pr)
+{
+	acpi_status             status = AE_OK;
+	u32			arg0_buf[3];
+	union acpi_object	arg0 = {ACPI_TYPE_BUFFER};
+	struct acpi_object_list no_object = {1, &arg0};
+	struct acpi_object_list *pdc;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_set_pdc");
+
+	arg0.buffer.length = 12;
+	arg0.buffer.pointer = (u8 *) arg0_buf;
+	arg0_buf[0] = ACPI_PDC_REVISION_ID;
+	arg0_buf[1] = 0;
+	arg0_buf[2] = 0;
+
+	pdc = (pr->performance->pdc) ? pr->performance->pdc : &no_object;
+
+	status = acpi_evaluate_object(pr->handle, "_PDC", pdc, NULL);
+
+	if ((ACPI_FAILURE(status)) && (pr->performance->pdc))
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Error evaluating _PDC, using legacy perf. control...\n"));
+
+	return_VALUE(status);
+}
+
+
+static int
+acpi_processor_get_performance_control (
+	struct acpi_processor *pr)
+{
+	int			result = 0;
+	acpi_status		status = 0;
+	struct acpi_buffer	buffer = {ACPI_ALLOCATE_BUFFER, NULL};
+	union acpi_object	*pct = NULL;
+	union acpi_object	obj = {0};
+
+	ACPI_FUNCTION_TRACE("acpi_processor_get_performance_control");
+
+	status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
+	if(ACPI_FAILURE(status)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PCT\n"));
+		return_VALUE(-ENODEV);
+	}
+
+	pct = (union acpi_object *) buffer.pointer;
+	if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
+		|| (pct->package.count != 2)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PCT data\n"));
+		result = -EFAULT;
+		goto end;
+	}
+
+	/*
+	 * control_register
+	 */
+
+	obj = pct->package.elements[0];
+
+	if ((obj.type != ACPI_TYPE_BUFFER)
+		|| (obj.buffer.length < sizeof(struct acpi_pct_register))
+		|| (obj.buffer.pointer == NULL)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+			"Invalid _PCT data (control_register)\n"));
+		result = -EFAULT;
+		goto end;
+	}
+	memcpy(&pr->performance->control_register, obj.buffer.pointer, sizeof(struct acpi_pct_register));
+
+
+	/*
+	 * status_register
+	 */
+
+	obj = pct->package.elements[1];
+
+	if ((obj.type != ACPI_TYPE_BUFFER)
+		|| (obj.buffer.length < sizeof(struct acpi_pct_register))
+		|| (obj.buffer.pointer == NULL)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+			"Invalid _PCT data (status_register)\n"));
+		result = -EFAULT;
+		goto end;
+	}
+
+	memcpy(&pr->performance->status_register, obj.buffer.pointer, sizeof(struct acpi_pct_register));
+
+end:
+	acpi_os_free(buffer.pointer);
+
+	return_VALUE(result);
+}
+
+
+static int
+acpi_processor_get_performance_states (
+	struct acpi_processor	*pr)
+{
+	int			result = 0;
+	acpi_status		status = AE_OK;
+	struct acpi_buffer	buffer = {ACPI_ALLOCATE_BUFFER, NULL};
+	struct acpi_buffer	format = {sizeof("NNNNNN"), "NNNNNN"};
+	struct acpi_buffer	state = {0, NULL};
+	union acpi_object 	*pss = NULL;
+	int			i;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_get_performance_states");
+
+	status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
+	if(ACPI_FAILURE(status)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PSS\n"));
+		return_VALUE(-ENODEV);
+	}
+
+	pss = (union acpi_object *) buffer.pointer;
+	if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data\n"));
+		result = -EFAULT;
+		goto end;
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
+		pss->package.count));
+
+	pr->performance->state_count = pss->package.count;
+	pr->performance->states = kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, GFP_KERNEL);
+	if (!pr->performance->states) {
+		result = -ENOMEM;
+		goto end;
+	}
+
+	for (i = 0; i < pr->performance->state_count; i++) {
+
+		struct acpi_processor_px *px = &(pr->performance->states[i]);
+
+		state.length = sizeof(struct acpi_processor_px);
+		state.pointer = px;
+
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
+
+		status = acpi_extract_package(&(pss->package.elements[i]),
+			&format, &state);
+		if (ACPI_FAILURE(status)) {
+			ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data\n"));
+			result = -EFAULT;
+			kfree(pr->performance->states);
+			goto end;
+		}
+
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+			"State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
+			i,
+			(u32) px->core_frequency,
+			(u32) px->power,
+			(u32) px->transition_latency,
+			(u32) px->bus_master_latency,
+			(u32) px->control,
+			(u32) px->status));
+
+		if (!px->core_frequency) {
+			ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data: freq is zero\n"));
+			result = -EFAULT;
+			kfree(pr->performance->states);
+			goto end;
+		}
+	}
+
+end:
+	acpi_os_free(buffer.pointer);
+
+	return_VALUE(result);
+}
+
+
+static int
+acpi_processor_get_performance_info (
+	struct acpi_processor	*pr)
+{
+	int			result = 0;
+	acpi_status		status = AE_OK;
+	acpi_handle		handle = NULL;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_get_performance_info");
+
+	if (!pr || !pr->performance || !pr->handle)
+		return_VALUE(-EINVAL);
+
+	acpi_processor_set_pdc(pr);
+
+	status = acpi_get_handle(pr->handle, "_PCT", &handle);
+	if (ACPI_FAILURE(status)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+			"ACPI-based processor performance control unavailable\n"));
+		return_VALUE(-ENODEV);
+	}
+
+	result = acpi_processor_get_performance_control(pr);
+	if (result)
+		return_VALUE(result);
+
+	result = acpi_processor_get_performance_states(pr);
+	if (result)
+		return_VALUE(result);
+
+	result = acpi_processor_get_platform_limit(pr);
+	if (result)
+		return_VALUE(result);
+
+	return_VALUE(0);
+}
+
+
+int acpi_processor_notify_smm(struct module *calling_module) {
+	acpi_status		status;
+	static int		is_done = 0;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_notify_smm");
+
+	if (!(acpi_processor_ppc_status & PPC_REGISTERED))
+		return_VALUE(-EBUSY);
+
+	if (!try_module_get(calling_module))
+		return_VALUE(-EINVAL);
+
+	/* is_done is set to negative if an error occured,
+	 * and to postitive if _no_ error occured, but SMM
+	 * was already notified. This avoids double notification
+	 * which might lead to unexpected results...
+	 */
+	if (is_done > 0) {
+		module_put(calling_module);
+		return_VALUE(0);
+	}
+	else if (is_done < 0) {
+		module_put(calling_module);
+		return_VALUE(is_done);
+	}
+
+	is_done = -EIO;
+
+	/* Can't write pstate_cnt to smi_cmd if either value is zero */
+	if ((!acpi_fadt.smi_cmd) ||
+	    (!acpi_fadt.pstate_cnt)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+			"No SMI port or pstate_cnt\n"));
+		module_put(calling_module);
+		return_VALUE(0);
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Writing pstate_cnt [0x%x] to smi_cmd [0x%x]\n", acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd));
+
+	/* FADT v1 doesn't support pstate_cnt, many BIOS vendors use
+	 * it anyway, so we need to support it... */
+	if (acpi_fadt_is_v1) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Using v1.0 FADT reserved value for pstate_cnt\n"));
+	}
+
+	status = acpi_os_write_port (acpi_fadt.smi_cmd,
+				     (u32) acpi_fadt.pstate_cnt, 8);
+	if (ACPI_FAILURE (status)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+				  "Failed to write pstate_cnt [0x%x] to "
+				  "smi_cmd [0x%x]\n", acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd));
+		module_put(calling_module);
+		return_VALUE(status);
+	}
+
+	/* Success. If there's no _PPC, we need to fear nothing, so
+	 * we can allow the cpufreq driver to be rmmod'ed. */
+	is_done = 1;
+
+	if (!(acpi_processor_ppc_status & PPC_IN_USE))
+		module_put(calling_module);
+
+	return_VALUE(0);
+}
+EXPORT_SYMBOL(acpi_processor_notify_smm);
+
+
+#ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
+/* /proc/acpi/processor/../performance interface (DEPRECATED) */
+
+static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file);
+static struct file_operations acpi_processor_perf_fops = {
+	.open 		= acpi_processor_perf_open_fs,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
+{
+	struct acpi_processor	*pr = (struct acpi_processor *)seq->private;
+	int			i;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_perf_seq_show");
+
+	if (!pr)
+		goto end;
+
+	if (!pr->performance) {
+		seq_puts(seq, "<not supported>\n");
+		goto end;
+	}
+
+	seq_printf(seq, "state count:             %d\n"
+			"active state:            P%d\n",
+			pr->performance->state_count,
+			pr->performance->state);
+
+	seq_puts(seq, "states:\n");
+	for (i = 0; i < pr->performance->state_count; i++)
+		seq_printf(seq, "   %cP%d:                  %d MHz, %d mW, %d uS\n",
+			(i == pr->performance->state?'*':' '), i,
+			(u32) pr->performance->states[i].core_frequency,
+			(u32) pr->performance->states[i].power,
+			(u32) pr->performance->states[i].transition_latency);
+
+end:
+	return_VALUE(0);
+}
+
+static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
+{
+	return single_open(file, acpi_processor_perf_seq_show,
+						PDE(inode)->data);
+}
+
+static ssize_t
+acpi_processor_write_performance (
+        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;
+	struct acpi_processor_performance *perf;
+	char			state_string[12] = {'\0'};
+	unsigned int            new_state = 0;
+	struct cpufreq_policy   policy;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_write_performance");
+
+	if (!pr || (count > sizeof(state_string) - 1))
+		return_VALUE(-EINVAL);
+
+	perf = pr->performance;
+	if (!perf)
+		return_VALUE(-EINVAL);
+
+	if (copy_from_user(state_string, buffer, count))
+		return_VALUE(-EFAULT);
+
+	state_string[count] = '\0';
+	new_state = simple_strtoul(state_string, NULL, 0);
+
+	if (new_state >= perf->state_count)
+		return_VALUE(-EINVAL);
+
+	cpufreq_get_policy(&policy, pr->id);
+
+	policy.cpu = pr->id;
+	policy.min = perf->states[new_state].core_frequency * 1000;
+	policy.max = perf->states[new_state].core_frequency * 1000;
+
+	result = cpufreq_set_policy(&policy);
+	if (result)
+		return_VALUE(result);
+
+	return_VALUE(count);
+}
+
+static void
+acpi_cpufreq_add_file (
+	struct acpi_processor *pr)
+{
+	struct proc_dir_entry	*entry = NULL;
+	struct acpi_device	*device = NULL;
+
+	ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile");
+
+	if (acpi_bus_get_device(pr->handle, &device))
+		return_VOID;
+
+	/* add file 'performance' [R/W] */
+	entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
+		  S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
+	if (!entry)
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+			"Unable to create '%s' fs entry\n",
+			ACPI_PROCESSOR_FILE_PERFORMANCE));
+	else {
+		entry->proc_fops = &acpi_processor_perf_fops;
+		entry->proc_fops->write = acpi_processor_write_performance;
+		entry->data = acpi_driver_data(device);
+		entry->owner = THIS_MODULE;
+	}
+	return_VOID;
+}
+
+static void
+acpi_cpufreq_remove_file (
+	struct acpi_processor *pr)
+{
+	struct acpi_device	*device = NULL;
+
+	ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile");
+
+	if (acpi_bus_get_device(pr->handle, &device))
+		return_VOID;
+
+	/* remove file 'performance' */
+	remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
+		  acpi_device_dir(device));
+
+	return_VOID;
+}
+
+#else
+static void acpi_cpufreq_add_file (struct acpi_processor *pr) { return; }
+static void acpi_cpufreq_remove_file (struct acpi_processor *pr) { return; }
+#endif /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
+
+
+int
+acpi_processor_register_performance (
+	struct acpi_processor_performance * performance,
+	unsigned int cpu)
+{
+	struct acpi_processor *pr;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_register_performance");
+
+	if (!(acpi_processor_ppc_status & PPC_REGISTERED))
+		return_VALUE(-EINVAL);
+
+	down(&performance_sem);
+
+	pr = processors[cpu];
+	if (!pr) {
+		up(&performance_sem);
+		return_VALUE(-ENODEV);
+	}
+
+	if (pr->performance) {
+		up(&performance_sem);
+		return_VALUE(-EBUSY);
+	}
+
+	pr->performance = performance;
+
+	if (acpi_processor_get_performance_info(pr)) {
+		pr->performance = NULL;
+		up(&performance_sem);
+		return_VALUE(-EIO);
+	}
+
+	acpi_cpufreq_add_file(pr);
+
+	up(&performance_sem);
+	return_VALUE(0);
+}
+EXPORT_SYMBOL(acpi_processor_register_performance);
+
+
+void
+acpi_processor_unregister_performance (
+	struct acpi_processor_performance * performance,
+	unsigned int cpu)
+{
+	struct acpi_processor *pr;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_unregister_performance");
+
+	down(&performance_sem);
+
+	pr = processors[cpu];
+	if (!pr) {
+		up(&performance_sem);
+		return_VOID;
+	}
+
+	kfree(pr->performance->states);
+	pr->performance = NULL;
+
+	acpi_cpufreq_remove_file(pr);
+
+	up(&performance_sem);
+
+	return_VOID;
+}
+EXPORT_SYMBOL(acpi_processor_unregister_performance);