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path: root/drivers/acpi/processor_thermal.c
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2009-08-26ACPI processor: force throttling state when BIOS returns incorrect valueFrans Pop
If the BIOS reports an invalid throttling state (which seems to be fairly common after system boot), a reset is done to state T0. Because of a check in acpi_processor_get_throttling_ptc(), the reset never actually gets executed, which results in the error reoccurring on every access of for example /proc/acpi/processor/CPU0/throttling. Add a 'force' option to acpi_processor_set_throttling() to ensure the reset really takes effect. Addresses http://bugzilla.kernel.org/show_bug.cgi?id=13389 This patch, together with the next one, fixes a regression introduced in 2.6.30, listed on the regression list. They have been available for 2.5 months now in bugzilla, but have not been picked up, despite various reminders and without any reason given. Google shows that numerous people are hitting this issue. The issue is in itself relatively minor, but the bug in the code is clear. The patches have been in all my kernels and today testing has shown that throttling works correctly with the patches applied when the system overheats (http://bugzilla.kernel.org/show_bug.cgi?id=13918#c14). Signed-off-by: Frans Pop <elendil@planet.nl> Acked-by: Zhang Rui <rui.zhang@intel.com> Cc: Len Brown <lenb@kernel.org> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-04-05Merge branch 'constify' into releaseLen Brown
2009-04-03ACPI: constify VFTs (1/2)Jan Engelhardt
Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Len Brown <len.brown@intel.com>
2009-02-20thermal: use integers rather than strings for thermal valuesMatthew Garrett
The thermal API currently uses strings to pass values to userspace. This makes it difficult to use from within the kernel. Change the interface to use integers and fix up the consumers. Signed-off-by: Matthew Garrett <mjg@redhat.com> Acked-by: Zhang Rui <rui.zhang@intel.com> Acked-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Len Brown <len.brown@intel.com>
2008-11-07ACPI: consolidate ACPI_*_COMPONENT definitions in acpi_drivers.hBjorn Helgaas
Move all the component definitions for drivers to a single shared place, include/acpi/acpi_drivers.h. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Len Brown <len.brown@intel.com>
2008-04-29acpi: use non-racy method for proc entries creationDenis V. Lunev
Use proc_create()/proc_create_data() to make sure that ->proc_fops and ->data be setup before gluing PDE to main tree. Add correct ->owner to proc_fops to fix reading/module unloading race. Signed-off-by: Denis V. Lunev <den@openvz.org> Cc: Len Brown <lenb@kernel.org> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-28[CPUFREQ] change cpu freq tables to per_cpu variablesMike Travis
Change cpufreq tables from arrays to per_cpu variables in drivers/acpi/processor_thermal.c Based on git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git Cc: Len Brown <len.brown@intel.com> Signed-off-by: Mike Travis <travis@sgi.com> Signed-off-by: Dave Jones <davej@codemonkey.org.uk>
2008-02-01ACPI: register ACPI Processor as generic thermal cooling deviceZhang Rui
Register ACPI processor as thermal cooling devices. A combination of processor T-state and P-state are used for thermal throttling. the processor will reduce the frequency first and then set the T-state. we use cpufreq_thermal_reduction_pctg to calculate the cpufreq limit, and call cpufreq_verify_with_limit to set the cpufreq limit. if cpufreq driver is loaded, then we have four cooling state for cpufreq control. cooling state 0: cpufreq limit == max_freq cooling state 1: cpufreq limit == max_freq * 80% cooling state 2: cpufreq limit == max_freq * 60% cooling state 3: cpufreq limit == max_freq * 40% after the cpufreq limit is set to 40 percentage of the max_freq, we use T-state for cooling. eg. a processor has P-state support, and it has 8 T-state (T0-T7), the max_state of the proceesor is 10: state cpufreq-limit T-state 0: max_freq T0 1: max_freq * 80% T0 2: max_freq * 60% T0 3: max_freq * 40% T0 4: max_freq * 40% T1 5: max_freq * 40% T2 6: max_freq * 40% T3 7: max_freq * 40% T4 8: max_freq * 40% T5 9: max_freq * 40% T6 10: max_freq * 40% T7 Signed-off-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Zhao Yakui <yakui.zhao@intel.com> Signed-off-by: Thomas Sujith <sujith.thomas@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
2007-02-12ACPI: delete extra #defines in /drivers/acpi/ driversLen Brown
Cosmetic only. Except in a single case, #define ACPI_*_DRIVER_NAME were invoked 0 or 1 times. Signed-off-by: Len Brown <len.brown@intel.com>
2007-02-12ACPI: clean up ACPI_MODULE_NAME() useLen Brown
cosmetic only Make "module name" actually match the file name. Invoke with ';' as leaving it off confuses Lindent and gcc doesn't care. Fix indentation where Lindent did get confused. Signed-off-by: Len Brown <len.brown@intel.com>
2006-10-14ACPI: Remove unnecessary from/to-void* and to-void casts in drivers/acpiJan Engelhardt
Signed-off-by: Jan Engelhardt <jengelh@gmx.de> Signed-off-by: Len Brown <len.brown@intel.com>
2006-06-27ACPI: delete tracing macros from drivers/acpi/*.cPatrick Mochel
Signed-off-by: Len Brown <len.brown@intel.com>
2006-06-27ACPI: un-export ACPI_ERROR() -- use printk(KERN_ERR...)Len Brown
Signed-off-by: Len Brown <len.brown@intel.com>
2006-06-26ACPI: Enable ACPI error messages w/o CONFIG_ACPI_DEBUGThomas Renninger
Signed-off-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Len Brown <len.brown@intel.com>
2006-01-08[ACPI] make two processor functions staticAdrian Bunk
acpi_processor_write_throttling() acpi_processor_write_limit() Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Len Brown <len.brown@intel.com>
2006-01-07[ACPI] move some run-time structure inits to compile timeArjan van de Ven
acpi_processor_limit_fops.write was written at run time, but can be initiailized at compile-time instead. Similar for acpi_video_bus_POST_fops.write and friends, but keep doing those at runtime to avoid prototype-hell. Signed-off-by: Arjan van de Ven <arjan@infradead.org> Signed-off-by: Len Brown <len.brown@intel.com>
2005-12-22[ACPI] fix passive cooling regressionThomas Renninger
Return logic was inverted. Going for changing the return value to not return zero as it is makes more sense regarding the naming of the function (cpu_has_cpufreq()). http://bugzilla.kernel.org/show_bug.cgi?id=3410 Signed-off-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Len Brown <len.brown@intel.com>
2005-11-30[ACPI] Allow return to active cooling mode once passive mode is enteredThomas Renninger
http://bugzilla.kernel.org/show_bug.cgi?id=3410 https://bugzilla.novell.com/show_bug.cgi?id=131543 Signed-off-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Konstantin Karasyov <konstantin.a.karasyov@intel.com> Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> Signed-off-by: Yu Luming <luming.yu@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org>
2005-08-05[ACPI] Lindent all ACPI filesLen Brown
Signed-off-by: Len Brown <len.brown@intel.com>
2005-04-16Linux-2.6.12-rc2Linus Torvalds
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!