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 000000000000..963e17aa205d
--- /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");