2005-07-29 17:15:00 -06:00
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/*
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* This file provides the ACPI based P-state support. This
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* module works with generic cpufreq infrastructure. Most of
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* the code is based on i386 version
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* (arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c)
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*
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* Copyright (C) 2005 Intel Corp
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* Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
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*/
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#include <linux/kernel.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 02:04:11 -06:00
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#include <linux/slab.h>
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2005-07-29 17:15:00 -06:00
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/cpufreq.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <asm/pal.h>
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#include <linux/acpi.h>
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#include <acpi/processor.h>
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MODULE_AUTHOR("Venkatesh Pallipadi");
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MODULE_DESCRIPTION("ACPI Processor P-States Driver");
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MODULE_LICENSE("GPL");
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struct cpufreq_acpi_io {
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struct acpi_processor_performance acpi_data;
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struct cpufreq_frequency_table *freq_table;
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unsigned int resume;
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};
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static struct cpufreq_acpi_io *acpi_io_data[NR_CPUS];
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static struct cpufreq_driver acpi_cpufreq_driver;
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static int
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processor_set_pstate (
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|
u32 value)
|
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{
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|
s64 retval;
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2011-03-27 07:04:46 -06:00
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pr_debug("processor_set_pstate\n");
|
2005-07-29 17:15:00 -06:00
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retval = ia64_pal_set_pstate((u64)value);
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if (retval) {
|
2011-03-27 07:04:46 -06:00
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pr_debug("Failed to set freq to 0x%x, with error 0x%lx\n",
|
2005-07-29 17:15:00 -06:00
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|
value, retval);
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return -ENODEV;
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}
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return (int)retval;
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}
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static int
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processor_get_pstate (
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u32 *value)
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|
|
{
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u64 pstate_index = 0;
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|
s64 retval;
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2011-03-27 07:04:46 -06:00
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pr_debug("processor_get_pstate\n");
|
2005-07-29 17:15:00 -06:00
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2006-12-01 16:28:14 -07:00
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retval = ia64_pal_get_pstate(&pstate_index,
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PAL_GET_PSTATE_TYPE_INSTANT);
|
2005-07-29 17:15:00 -06:00
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*value = (u32) pstate_index;
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if (retval)
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2011-03-27 07:04:46 -06:00
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pr_debug("Failed to get current freq with "
|
2008-07-17 12:11:17 -06:00
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"error 0x%lx, idx 0x%x\n", retval, *value);
|
2005-07-29 17:15:00 -06:00
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return (int)retval;
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}
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/* To be used only after data->acpi_data is initialized */
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static unsigned
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extract_clock (
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struct cpufreq_acpi_io *data,
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unsigned value,
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unsigned int cpu)
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{
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unsigned long i;
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2011-03-27 07:04:46 -06:00
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pr_debug("extract_clock\n");
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2005-07-29 17:15:00 -06:00
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for (i = 0; i < data->acpi_data.state_count; i++) {
|
2006-12-01 16:28:14 -07:00
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if (value == data->acpi_data.states[i].status)
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2005-07-29 17:15:00 -06:00
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return data->acpi_data.states[i].core_frequency;
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}
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return data->acpi_data.states[i-1].core_frequency;
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}
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static unsigned int
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processor_get_freq (
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struct cpufreq_acpi_io *data,
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unsigned int cpu)
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{
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int ret = 0;
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u32 value = 0;
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cpumask_t saved_mask;
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unsigned long clock_freq;
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2011-03-27 07:04:46 -06:00
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pr_debug("processor_get_freq\n");
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2005-07-29 17:15:00 -06:00
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saved_mask = current->cpus_allowed;
|
2010-03-26 16:02:23 -06:00
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set_cpus_allowed_ptr(current, cpumask_of(cpu));
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2007-08-13 15:49:46 -06:00
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if (smp_processor_id() != cpu)
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2005-07-29 17:15:00 -06:00
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goto migrate_end;
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2006-12-01 16:28:14 -07:00
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/* processor_get_pstate gets the instantaneous frequency */
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2005-07-29 17:15:00 -06:00
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ret = processor_get_pstate(&value);
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if (ret) {
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2010-03-26 16:02:23 -06:00
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set_cpus_allowed_ptr(current, &saved_mask);
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2005-07-29 17:15:00 -06:00
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printk(KERN_WARNING "get performance failed with error %d\n",
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ret);
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2007-08-13 15:49:46 -06:00
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ret = 0;
|
2005-07-29 17:15:00 -06:00
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goto migrate_end;
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}
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clock_freq = extract_clock(data, value, cpu);
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ret = (clock_freq*1000);
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migrate_end:
|
2010-03-26 16:02:23 -06:00
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set_cpus_allowed_ptr(current, &saved_mask);
|
2005-07-29 17:15:00 -06:00
|
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|
return ret;
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}
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static int
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processor_set_freq (
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struct cpufreq_acpi_io *data,
|
2013-03-24 00:26:43 -06:00
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struct cpufreq_policy *policy,
|
2005-07-29 17:15:00 -06:00
|
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int state)
|
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{
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int ret = 0;
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u32 value = 0;
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|
cpumask_t saved_mask;
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int retval;
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|
2011-03-27 07:04:46 -06:00
|
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pr_debug("processor_set_freq\n");
|
2005-07-29 17:15:00 -06:00
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saved_mask = current->cpus_allowed;
|
2013-03-24 00:26:43 -06:00
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|
set_cpus_allowed_ptr(current, cpumask_of(policy->cpu));
|
|
|
|
if (smp_processor_id() != policy->cpu) {
|
2005-07-29 17:15:00 -06:00
|
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|
retval = -EAGAIN;
|
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|
goto migrate_end;
|
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|
|
}
|
|
|
|
|
|
|
|
if (state == data->acpi_data.state) {
|
|
|
|
if (unlikely(data->resume)) {
|
2011-03-27 07:04:46 -06:00
|
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|
pr_debug("Called after resume, resetting to P%d\n", state);
|
2005-07-29 17:15:00 -06:00
|
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|
data->resume = 0;
|
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|
} else {
|
2011-03-27 07:04:46 -06:00
|
|
|
pr_debug("Already at target state (P%d)\n", state);
|
2005-07-29 17:15:00 -06:00
|
|
|
retval = 0;
|
|
|
|
goto migrate_end;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2011-03-27 07:04:46 -06:00
|
|
|
pr_debug("Transitioning from P%d to P%d\n",
|
2005-07-29 17:15:00 -06:00
|
|
|
data->acpi_data.state, state);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* First we write the target state's 'control' value to the
|
|
|
|
* control_register.
|
|
|
|
*/
|
|
|
|
|
|
|
|
value = (u32) data->acpi_data.states[state].control;
|
|
|
|
|
2011-03-27 07:04:46 -06:00
|
|
|
pr_debug("Transitioning to state: 0x%08x\n", value);
|
2005-07-29 17:15:00 -06:00
|
|
|
|
|
|
|
ret = processor_set_pstate(value);
|
|
|
|
if (ret) {
|
|
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|
printk(KERN_WARNING "Transition failed with error %d\n", ret);
|
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|
|
retval = -ENODEV;
|
|
|
|
goto migrate_end;
|
|
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|
}
|
|
|
|
|
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|
|
data->acpi_data.state = state;
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|
|
|
|
|
|
retval = 0;
|
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|
|
|
|
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|
migrate_end:
|
2010-03-26 16:02:23 -06:00
|
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|
set_cpus_allowed_ptr(current, &saved_mask);
|
2005-07-29 17:15:00 -06:00
|
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|
return (retval);
|
|
|
|
}
|
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|
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|
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|
|
|
|
|
|
static unsigned int
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|
|
|
acpi_cpufreq_get (
|
|
|
|
unsigned int cpu)
|
|
|
|
{
|
|
|
|
struct cpufreq_acpi_io *data = acpi_io_data[cpu];
|
|
|
|
|
2011-03-27 07:04:46 -06:00
|
|
|
pr_debug("acpi_cpufreq_get\n");
|
2005-07-29 17:15:00 -06:00
|
|
|
|
|
|
|
return processor_get_freq(data, cpu);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
acpi_cpufreq_target (
|
|
|
|
struct cpufreq_policy *policy,
|
2013-10-25 08:15:48 -06:00
|
|
|
unsigned int index)
|
2005-07-29 17:15:00 -06:00
|
|
|
{
|
2013-10-25 08:15:48 -06:00
|
|
|
return processor_set_freq(acpi_io_data[policy->cpu], policy, index);
|
2005-07-29 17:15:00 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
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;
|
|
|
|
|
2011-03-27 07:04:46 -06:00
|
|
|
pr_debug("acpi_cpufreq_cpu_init\n");
|
2005-07-29 17:15:00 -06:00
|
|
|
|
2013-08-06 11:23:06 -06:00
|
|
|
data = kzalloc(sizeof(*data), GFP_KERNEL);
|
2005-07-29 17:15:00 -06:00
|
|
|
if (!data)
|
|
|
|
return (-ENOMEM);
|
|
|
|
|
|
|
|
acpi_io_data[cpu] = data;
|
|
|
|
|
|
|
|
result = acpi_processor_register_performance(&data->acpi_data, cpu);
|
|
|
|
|
|
|
|
if (result)
|
|
|
|
goto err_free;
|
|
|
|
|
|
|
|
/* capability check */
|
|
|
|
if (data->acpi_data.state_count <= 1) {
|
2011-03-27 07:04:46 -06:00
|
|
|
pr_debug("No P-States\n");
|
2005-07-29 17:15:00 -06:00
|
|
|
result = -ENODEV;
|
|
|
|
goto err_unreg;
|
|
|
|
}
|
|
|
|
|
|
|
|
if ((data->acpi_data.control_register.space_id !=
|
|
|
|
ACPI_ADR_SPACE_FIXED_HARDWARE) ||
|
|
|
|
(data->acpi_data.status_register.space_id !=
|
|
|
|
ACPI_ADR_SPACE_FIXED_HARDWARE)) {
|
2011-03-27 07:04:46 -06:00
|
|
|
pr_debug("Unsupported address space [%d, %d]\n",
|
2005-07-29 17:15:00 -06:00
|
|
|
(u32) (data->acpi_data.control_register.space_id),
|
|
|
|
(u32) (data->acpi_data.status_register.space_id));
|
|
|
|
result = -ENODEV;
|
|
|
|
goto err_unreg;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* alloc freq_table */
|
2013-08-06 11:23:06 -06:00
|
|
|
data->freq_table = kmalloc(sizeof(*data->freq_table) *
|
2005-07-29 17:15:00 -06:00
|
|
|
(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;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* table init */
|
|
|
|
for (i = 0; i <= data->acpi_data.state_count; i++)
|
|
|
|
{
|
2013-03-30 04:55:15 -06:00
|
|
|
data->freq_table[i].driver_data = i;
|
2005-07-29 17:15:00 -06:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2013-09-16 07:26:17 -06:00
|
|
|
result = cpufreq_table_validate_and_show(policy, data->freq_table);
|
2005-07-29 17:15:00 -06:00
|
|
|
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++)
|
2011-03-27 07:04:46 -06:00
|
|
|
pr_debug(" %cP%d: %d MHz, %d mW, %d uS, %d uS, 0x%x 0x%x\n",
|
2005-07-29 17:15:00 -06:00
|
|
|
(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,
|
|
|
|
(u32) data->acpi_data.states[i].bus_master_latency,
|
|
|
|
(u32) data->acpi_data.states[i].status,
|
|
|
|
(u32) data->acpi_data.states[i].control);
|
|
|
|
|
|
|
|
/* the first call to ->target() should result in us actually
|
|
|
|
* writing something to the appropriate registers. */
|
|
|
|
data->resume = 1;
|
|
|
|
|
|
|
|
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];
|
|
|
|
|
2011-03-27 07:04:46 -06:00
|
|
|
pr_debug("acpi_cpufreq_cpu_exit\n");
|
2005-07-29 17:15:00 -06:00
|
|
|
|
|
|
|
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 struct cpufreq_driver acpi_cpufreq_driver = {
|
2013-10-03 08:58:07 -06:00
|
|
|
.verify = cpufreq_generic_frequency_table_verify,
|
2013-10-25 08:15:48 -06:00
|
|
|
.target_index = acpi_cpufreq_target,
|
2005-07-29 17:15:00 -06:00
|
|
|
.get = acpi_cpufreq_get,
|
|
|
|
.init = acpi_cpufreq_cpu_init,
|
|
|
|
.exit = acpi_cpufreq_cpu_exit,
|
|
|
|
.name = "acpi-cpufreq",
|
2013-10-03 08:58:07 -06:00
|
|
|
.attr = cpufreq_generic_attr,
|
2005-07-29 17:15:00 -06:00
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
static int __init
|
|
|
|
acpi_cpufreq_init (void)
|
|
|
|
{
|
2011-03-27 07:04:46 -06:00
|
|
|
pr_debug("acpi_cpufreq_init\n");
|
2005-07-29 17:15:00 -06:00
|
|
|
|
|
|
|
return cpufreq_register_driver(&acpi_cpufreq_driver);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static void __exit
|
|
|
|
acpi_cpufreq_exit (void)
|
|
|
|
{
|
2011-03-27 07:04:46 -06:00
|
|
|
pr_debug("acpi_cpufreq_exit\n");
|
2005-07-29 17:15:00 -06:00
|
|
|
|
|
|
|
cpufreq_unregister_driver(&acpi_cpufreq_driver);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
late_initcall(acpi_cpufreq_init);
|
|
|
|
module_exit(acpi_cpufreq_exit);
|
|
|
|
|