Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 537 insertions, 0 deletions

diff --git a/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c b/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c
new file mode 100644
index 0000000..963e17a
--- /dev/null
+++ b/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c
@@ -0,0 +1,537 @@
+/*
+ * acpi-cpufreq.c - ACPI Processor P-States Driver ($Revision: 1.3 $)
+ *
+ *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
+ *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ *  Copyright (C) 2002 - 2004 Dominik Brodowski <linux@brodo.de>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  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/config.h>
+#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/delay.h>
+#include <asm/uaccess.h>
+
+#include <linux/acpi.h>
+#include <acpi/processor.h>
+
+#include "speedstep-est-common.h"
+
+#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "acpi-cpufreq", msg)
+
+MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski");
+MODULE_DESCRIPTION("ACPI Processor P-States Driver");
+MODULE_LICENSE("GPL");
+
+
+struct cpufreq_acpi_io {
+	struct acpi_processor_performance	acpi_data;
+	struct cpufreq_frequency_table		*freq_table;
+	unsigned int				resume;
+};
+
+static struct cpufreq_acpi_io	*acpi_io_data[NR_CPUS];
+
+static struct cpufreq_driver acpi_cpufreq_driver;
+
+static int
+acpi_processor_write_port(
+	u16	port,
+	u8	bit_width,
+	u32	value)
+{
+	if (bit_width <= 8) {
+		outb(value, port);
+	} else if (bit_width <= 16) {
+		outw(value, port);
+	} else if (bit_width <= 32) {
+		outl(value, port);
+	} else {
+		return -ENODEV;
+	}
+	return 0;
+}
+
+static int
+acpi_processor_read_port(
+	u16	port,
+	u8	bit_width,
+	u32	*ret)
+{
+	*ret = 0;
+	if (bit_width <= 8) {
+		*ret = inb(port);
+	} else if (bit_width <= 16) {
+		*ret = inw(port);
+	} else if (bit_width <= 32) {
+		*ret = inl(port);
+	} else {
+		return -ENODEV;
+	}
+	return 0;
+}
+
+static int
+acpi_processor_set_performance (
+	struct cpufreq_acpi_io	*data,
+	unsigned int		cpu,
+	int			state)
+{
+	u16			port = 0;
+	u8			bit_width = 0;
+	int			ret = 0;
+	u32			value = 0;
+	int			i = 0;
+	struct cpufreq_freqs    cpufreq_freqs;
+	cpumask_t		saved_mask;
+	int			retval;
+
+	dprintk("acpi_processor_set_performance\n");
+
+	/*
+	 * TBD: Use something other than set_cpus_allowed.
+	 * As set_cpus_allowed is a bit racy, 
+	 * with any other set_cpus_allowed for this process.
+	 */
+	saved_mask = current->cpus_allowed;
+	set_cpus_allowed(current, cpumask_of_cpu(cpu));
+	if (smp_processor_id() != cpu) {
+		return (-EAGAIN);
+	}
+	
+	if (state == data->acpi_data.state) {
+		if (unlikely(data->resume)) {
+			dprintk("Called after resume, resetting to P%d\n", state);
+			data->resume = 0;
+		} else {
+			dprintk("Already at target state (P%d)\n", state);
+			retval = 0;
+			goto migrate_end;
+		}
+	}
+
+	dprintk("Transitioning from P%d to P%d\n",
+		data->acpi_data.state, state);
+
+	/* cpufreq frequency struct */
+	cpufreq_freqs.cpu = cpu;
+	cpufreq_freqs.old = data->freq_table[data->acpi_data.state].frequency;
+	cpufreq_freqs.new = data->freq_table[state].frequency;
+
+	/* notify cpufreq */
+	cpufreq_notify_transition(&cpufreq_freqs, CPUFREQ_PRECHANGE);
+
+	/*
+	 * First we write the target state's 'control' value to the
+	 * control_register.
+	 */
+
+	port = data->acpi_data.control_register.address;
+	bit_width = data->acpi_data.control_register.bit_width;
+	value = (u32) data->acpi_data.states[state].control;
+
+	dprintk("Writing 0x%08x to port 0x%04x\n", value, port);
+
+	ret = acpi_processor_write_port(port, bit_width, value);
+	if (ret) {
+		dprintk("Invalid port width 0x%04x\n", bit_width);
+		retval = ret;
+		goto migrate_end;
+	}
+
+	/*
+	 * Then we read the 'status_register' and compare the value with the
+	 * target state's 'status' to make sure the transition was successful.
+	 * Note that we'll poll for up to 1ms (100 cycles of 10us) before
+	 * giving up.
+	 */
+
+	port = data->acpi_data.status_register.address;
+	bit_width = data->acpi_data.status_register.bit_width;
+
+	dprintk("Looking for 0x%08x from port 0x%04x\n",
+		(u32) data->acpi_data.states[state].status, port);
+
+	for (i=0; i<100; i++) {
+		ret = acpi_processor_read_port(port, bit_width, &value);
+		if (ret) {	
+			dprintk("Invalid port width 0x%04x\n", bit_width);
+			retval = ret;
+			goto migrate_end;
+		}
+		if (value == (u32) data->acpi_data.states[state].status)
+			break;
+		udelay(10);
+	}
+
+	/* notify cpufreq */
+	cpufreq_notify_transition(&cpufreq_freqs, CPUFREQ_POSTCHANGE);
+
+	if (value != (u32) data->acpi_data.states[state].status) {
+		unsigned int tmp = cpufreq_freqs.new;
+		cpufreq_freqs.new = cpufreq_freqs.old;
+		cpufreq_freqs.old = tmp;
+		cpufreq_notify_transition(&cpufreq_freqs, CPUFREQ_PRECHANGE);
+		cpufreq_notify_transition(&cpufreq_freqs, CPUFREQ_POSTCHANGE);
+		printk(KERN_WARNING "acpi-cpufreq: Transition failed\n");
+		retval = -ENODEV;
+		goto migrate_end;
+	}
+
+	dprintk("Transition successful after %d microseconds\n", i * 10);
+
+	data->acpi_data.state = state;
+
+	retval = 0;
+migrate_end:
+	set_cpus_allowed(current, saved_mask);
+	return (retval);
+}
+
+
+static int
+acpi_cpufreq_target (
+	struct cpufreq_policy   *policy,
+	unsigned int target_freq,
+	unsigned int relation)
+{
+	struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu];
+	unsigned int next_state = 0;
+	unsigned int result = 0;
+
+	dprintk("acpi_cpufreq_setpolicy\n");
+
+	result = cpufreq_frequency_table_target(policy,
+			data->freq_table,
+			target_freq,
+			relation,
+			&next_state);
+	if (result)
+		return (result);
+
+	result = acpi_processor_set_performance (data, policy->cpu, next_state);
+
+	return (result);
+}
+
+
+static int
+acpi_cpufreq_verify (
+	struct cpufreq_policy   *policy)
+{
+	unsigned int result = 0;
+	struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu];
+
+	dprintk("acpi_cpufreq_verify\n");
+
+	result = cpufreq_frequency_table_verify(policy, 
+			data->freq_table);
+
+	return (result);
+}
+
+
+static unsigned long
+acpi_cpufreq_guess_freq (
+	struct cpufreq_acpi_io	*data,
+	unsigned int		cpu)
+{
+	if (cpu_khz) {
+		/* search the closest match to cpu_khz */
+		unsigned int i;
+		unsigned long freq;
+		unsigned long freqn = data->acpi_data.states[0].core_frequency * 1000;
+
+		for (i=0; i < (data->acpi_data.state_count - 1); i++) {
+			freq = freqn;
+			freqn = data->acpi_data.states[i+1].core_frequency * 1000;
+			if ((2 * cpu_khz) > (freqn + freq)) {
+				data->acpi_data.state = i;
+				return (freq);
+			}
+		}
+		data->acpi_data.state = data->acpi_data.state_count - 1;
+		return (freqn);
+	} else
+		/* assume CPU is at P0... */
+		data->acpi_data.state = 0;
+		return data->acpi_data.states[0].core_frequency * 1000;
+	
+}
+
+
+/* 
+ * acpi_processor_cpu_init_pdc_est - let BIOS know about the SMP capabilities
+ * of this driver
+ * @perf: processor-specific acpi_io_data struct
+ * @cpu: CPU being initialized
+ *
+ * To avoid issues with legacy OSes, some BIOSes require to be informed of
+ * the SMP capabilities of OS P-state driver. Here we set the bits in _PDC 
+ * accordingly, for Enhanced Speedstep. Actual call to _PDC is done in
+ * driver/acpi/processor.c
+ */
+static void 
+acpi_processor_cpu_init_pdc_est(
+		struct acpi_processor_performance *perf, 
+		unsigned int cpu,
+		struct acpi_object_list *obj_list
+		)
+{
+	union acpi_object *obj;
+	u32 *buf;
+	struct cpuinfo_x86 *c = cpu_data + cpu;
+	dprintk("acpi_processor_cpu_init_pdc_est\n");
+
+	if (!cpu_has(c, X86_FEATURE_EST))
+		return;
+
+	/* Initialize pdc. It will be used later. */
+	if (!obj_list)
+		return;
+		
+	if (!(obj_list->count && obj_list->pointer))
+		return;
+
+	obj = obj_list->pointer;
+	if ((obj->buffer.length == 12) && obj->buffer.pointer) {
+		buf = (u32 *)obj->buffer.pointer;
+       		buf[0] = ACPI_PDC_REVISION_ID;
+       		buf[1] = 1;
+       		buf[2] = ACPI_PDC_EST_CAPABILITY_SMP;
+		perf->pdc = obj_list;
+	}
+	return;
+}
+ 
+
+/* CPU specific PDC initialization */
+static void 
+acpi_processor_cpu_init_pdc(
+		struct acpi_processor_performance *perf, 
+		unsigned int cpu,
+		struct acpi_object_list *obj_list
+		)
+{
+	struct cpuinfo_x86 *c = cpu_data + cpu;
+	dprintk("acpi_processor_cpu_init_pdc\n");
+	perf->pdc = NULL;
+	if (cpu_has(c, X86_FEATURE_EST))
+		acpi_processor_cpu_init_pdc_est(perf, cpu, obj_list);
+	return;
+}
+
+
+static int
+acpi_cpufreq_cpu_init (
+	struct cpufreq_policy   *policy)
+{
+	unsigned int		i;
+	unsigned int		cpu = policy->cpu;
+	struct cpufreq_acpi_io	*data;
+	unsigned int		result = 0;
+
+	union acpi_object		arg0 = {ACPI_TYPE_BUFFER};
+	u32				arg0_buf[3];
+	struct acpi_object_list 	arg_list = {1, &arg0};
+
+	dprintk("acpi_cpufreq_cpu_init\n");
+	/* setup arg_list for _PDC settings */
+        arg0.buffer.length = 12;
+        arg0.buffer.pointer = (u8 *) arg0_buf;
+
+	data = kmalloc(sizeof(struct cpufreq_acpi_io), GFP_KERNEL);
+	if (!data)
+		return (-ENOMEM);
+	memset(data, 0, sizeof(struct cpufreq_acpi_io));
+
+	acpi_io_data[cpu] = data;
+
+	acpi_processor_cpu_init_pdc(&data->acpi_data, cpu, &arg_list);
+	result = acpi_processor_register_performance(&data->acpi_data, cpu);
+	data->acpi_data.pdc = NULL;
+
+	if (result)
+		goto err_free;
+
+	if (is_const_loops_cpu(cpu)) {
+		acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS;
+	}
+
+	/* capability check */
+	if (data->acpi_data.state_count <= 1) {
+		dprintk("No P-States\n");
+		result = -ENODEV;
+		goto err_unreg;
+	}
+	if ((data->acpi_data.control_register.space_id != ACPI_ADR_SPACE_SYSTEM_IO) ||
+	    (data->acpi_data.status_register.space_id != ACPI_ADR_SPACE_SYSTEM_IO)) {
+		dprintk("Unsupported address space [%d, %d]\n",
+			(u32) (data->acpi_data.control_register.space_id),
+			(u32) (data->acpi_data.status_register.space_id));
+		result = -ENODEV;
+		goto err_unreg;
+	}
+
+	/* alloc freq_table */
+	data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) * (data->acpi_data.state_count + 1), GFP_KERNEL);
+	if (!data->freq_table) {
+		result = -ENOMEM;
+		goto err_unreg;
+	}
+
+	/* detect transition latency */
+	policy->cpuinfo.transition_latency = 0;
+	for (i=0; i<data->acpi_data.state_count; i++) {
+		if ((data->acpi_data.states[i].transition_latency * 1000) > policy->cpuinfo.transition_latency)
+			policy->cpuinfo.transition_latency = data->acpi_data.states[i].transition_latency * 1000;
+	}
+	policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
+
+	/* The current speed is unknown and not detectable by ACPI...  */
+	policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu);
+
+	/* table init */
+	for (i=0; i<=data->acpi_data.state_count; i++)
+	{
+		data->freq_table[i].index = i;
+		if (i<data->acpi_data.state_count)
+			data->freq_table[i].frequency = data->acpi_data.states[i].core_frequency * 1000;
+		else
+			data->freq_table[i].frequency = CPUFREQ_TABLE_END;
+	}
+
+	result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table);
+	if (result) {
+		goto err_freqfree;
+	}
+
+	/* notify BIOS that we exist */
+	acpi_processor_notify_smm(THIS_MODULE);
+
+	printk(KERN_INFO "acpi-cpufreq: CPU%u - ACPI performance management activated.\n",
+	       cpu);
+	for (i = 0; i < data->acpi_data.state_count; i++)
+		dprintk("     %cP%d: %d MHz, %d mW, %d uS\n",
+			(i == data->acpi_data.state?'*':' '), i,
+			(u32) data->acpi_data.states[i].core_frequency,
+			(u32) data->acpi_data.states[i].power,
+			(u32) data->acpi_data.states[i].transition_latency);
+
+	cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu);
+	return (result);
+
+ err_freqfree:
+	kfree(data->freq_table);
+ err_unreg:
+	acpi_processor_unregister_performance(&data->acpi_data, cpu);
+ err_free:
+	kfree(data);
+	acpi_io_data[cpu] = NULL;
+
+	return (result);
+}
+
+
+static int
+acpi_cpufreq_cpu_exit (
+	struct cpufreq_policy   *policy)
+{
+	struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu];
+
+
+	dprintk("acpi_cpufreq_cpu_exit\n");
+
+	if (data) {
+		cpufreq_frequency_table_put_attr(policy->cpu);
+		acpi_io_data[policy->cpu] = NULL;
+		acpi_processor_unregister_performance(&data->acpi_data, policy->cpu);
+		kfree(data);
+	}
+
+	return (0);
+}
+
+static int
+acpi_cpufreq_resume (
+	struct cpufreq_policy   *policy)
+{
+	struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu];
+
+
+	dprintk("acpi_cpufreq_resume\n");
+
+	data->resume = 1;
+
+	return (0);
+}
+
+
+static struct freq_attr* acpi_cpufreq_attr[] = {
+	&cpufreq_freq_attr_scaling_available_freqs,
+	NULL,
+};
+
+static struct cpufreq_driver acpi_cpufreq_driver = {
+	.verify 	= acpi_cpufreq_verify,
+	.target 	= acpi_cpufreq_target,
+	.init		= acpi_cpufreq_cpu_init,
+	.exit		= acpi_cpufreq_cpu_exit,
+	.resume		= acpi_cpufreq_resume,
+	.name		= "acpi-cpufreq",
+	.owner		= THIS_MODULE,
+	.attr           = acpi_cpufreq_attr,
+};
+
+
+static int __init
+acpi_cpufreq_init (void)
+{
+	int                     result = 0;
+
+	dprintk("acpi_cpufreq_init\n");
+
+ 	result = cpufreq_register_driver(&acpi_cpufreq_driver);
+	
+	return (result);
+}
+
+
+static void __exit
+acpi_cpufreq_exit (void)
+{
+	dprintk("acpi_cpufreq_exit\n");
+
+	cpufreq_unregister_driver(&acpi_cpufreq_driver);
+
+	return;
+}
+
+
+late_initcall(acpi_cpufreq_init);
+module_exit(acpi_cpufreq_exit);
+
+MODULE_ALIAS("acpi");