From 684d263e75a6a7ede638afa60e35a238e24c12ba Mon Sep 17 00:00:00 2001 From: Richard Purdie Date: Tue, 26 Jan 2010 15:59:18 +0000 Subject: linux-moblin: Add 2.6.31.5 Signed-off-by: Richard Purdie --- .../linux-2.6.32-acpi-cstate-fixup.patch | 173 +++++++++++++++++++++ 1 file changed, 173 insertions(+) create mode 100644 meta-moblin/packages/linux/linux-moblin-2.6.31.5/linux-2.6.32-acpi-cstate-fixup.patch (limited to 'meta-moblin/packages/linux/linux-moblin-2.6.31.5/linux-2.6.32-acpi-cstate-fixup.patch') diff --git a/meta-moblin/packages/linux/linux-moblin-2.6.31.5/linux-2.6.32-acpi-cstate-fixup.patch b/meta-moblin/packages/linux/linux-moblin-2.6.31.5/linux-2.6.32-acpi-cstate-fixup.patch new file mode 100644 index 000000000..6a1204d4c --- /dev/null +++ b/meta-moblin/packages/linux/linux-moblin-2.6.31.5/linux-2.6.32-acpi-cstate-fixup.patch @@ -0,0 +1,173 @@ +From edeae90d635501a632efa0c7fe0667aa2cbe29be Mon Sep 17 00:00:00 2001 +From: Arjan van de Ven +Date: Mon, 28 Sep 2009 15:14:04 +0200 +Subject: [PATCH] acpi: Provide a set of tables to check the BIOS tables for correctness + +Today, the BIOS provides us with latency information for each C state. +Unfortunately this information is sometimes put into the BIOS by +apprentice BIOS programmers in a hurry, and as a result, it occasionally +contains utter garbage. + +This patch adds a table based verification; if the CPU is known in the table, +the values the BIOS provides to us are corrected for the apprentice-factor +so that the CPUIDLE code can rely on the latency and break-even values +to be reasonably sane. + +Signed-off-by: Arjan van de Ven +--- + drivers/acpi/Makefile | 2 +- + drivers/acpi/processor_idle.c | 3 + + drivers/acpi/processor_mwait_table.c | 110 ++++++++++++++++++++++++++++++++++ + include/acpi/processor.h | 3 + + 4 files changed, 117 insertions(+), 1 deletions(-) + create mode 100644 drivers/acpi/processor_mwait_table.c + +diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile +index 82cd49d..ab56b28 100644 +--- a/drivers/acpi/Makefile ++++ b/drivers/acpi/Makefile +@@ -60,5 +60,5 @@ obj-$(CONFIG_ACPI_POWER_METER) += power_meter.o + + # processor has its own "processor." module_param namespace + processor-y := processor_core.o processor_throttling.o +-processor-y += processor_idle.o processor_thermal.o ++processor-y += processor_idle.o processor_thermal.o processor_mwait_table.o + processor-$(CONFIG_CPU_FREQ) += processor_perflib.o +diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c +index cc61a62..db444a0 100644 +--- a/drivers/acpi/processor_idle.c ++++ b/drivers/acpi/processor_idle.c +@@ -1088,6 +1088,9 @@ static int acpi_processor_setup_cpuidle(struct acpi_processor *pr) + state->target_residency = cx->latency * latency_factor; + state->power_usage = cx->power; + ++ if (cx->entry_method == ACPI_CSTATE_FFH) ++ acpi_verify_mwait_data(state, cx); ++ + state->flags = 0; + switch (cx->type) { + case ACPI_STATE_C1: +diff --git a/drivers/acpi/processor_mwait_table.c b/drivers/acpi/processor_mwait_table.c +new file mode 100644 +index 0000000..f29c28c +--- /dev/null ++++ b/drivers/acpi/processor_mwait_table.c +@@ -0,0 +1,102 @@ ++/* ++ * processor_mwait_table.c: BIOS table verification/correction ++ * ++ * (C) Copyright 2009 Intel Corporation ++ * Authors: ++ * Arjan van de Ven ++ * ++ * 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; version 2 ++ * of the License. ++ */ ++ ++#include ++#include ++#include ++#include ++ ++ ++#define ATLEAST 1 ++#define ATMOST 2 ++#define EXACTLY 3 ++ ++#define MAX_ENTRIES 12 ++ ++struct mwait_entry { ++ unsigned int mwait_value; ++ unsigned long exit_latency; ++ unsigned long break_even_point; ++ int compare_method; ++}; ++ ++struct cpu_entry { ++ int vendor; ++ int family; ++ int model; ++ ++ struct mwait_entry entries[MAX_ENTRIES]; ++}; ++ ++static struct cpu_entry mwait_entries[] = ++{ ++ /* Intel "Atom" CPUs */ ++ {.vendor = X86_VENDOR_INTEL, .family = 6, . model = 28, ++ .entries = { ++ {0x00, 1, 1, ATLEAST}, ++ {0x10, 2, 20, ATLEAST}, ++ {0x30, 57, 300, ATLEAST}, ++ {0x50, 64, 4000, ATLEAST}, ++ } ++ }, ++ ++ ++}; ++ ++ ++static unsigned long ++compare_and_set(unsigned long original, unsigned long new, int compare) ++{ ++ if (compare == EXACTLY) ++ return new; ++ if (compare == ATLEAST && new > original) ++ return new; ++ if (compare == ATMOST && new < original) ++ return new; ++ return original; ++} ++ ++ ++void acpi_verify_mwait_data(struct cpuidle_state *state, ++ struct acpi_processor_cx *cx) ++{ ++#if defined(__i386__) || defined(__x86_64__) ++ int i; ++ ++ struct cpuinfo_x86 *cpudata = &boot_cpu_data; ++ ++ ++ for (i = 0; i < ARRAY_SIZE(mwait_entries); i++) { ++ int j; ++ if (mwait_entries[i].vendor != cpudata->x86_vendor) ++ continue; ++ if (mwait_entries[i].family != cpudata->x86) ++ continue; ++ if (mwait_entries[i].model != cpudata->x86_model) ++ continue; ++ for (j = 0; j < ARRAY_SIZE(mwait_entries[i].entries); j++) { ++ if (!mwait_entries[i].entries[j].compare_method) ++ continue; ++ if (mwait_entries[i].entries[j].mwait_value != cx->address) ++ continue; ++ state->exit_latency = compare_and_set(state->exit_latency, ++ mwait_entries[i].entries[j].exit_latency, ++ mwait_entries[i].entries[j].compare_method); ++ state->target_residency = compare_and_set(state->target_residency, ++ mwait_entries[i].entries[j].break_even_point, ++ mwait_entries[i].entries[j].compare_method); ++ break; ++ } ++ } ++#endif ++} +diff --git a/include/acpi/processor.h b/include/acpi/processor.h +index 740ac3a..175e4d1 100644 +--- a/include/acpi/processor.h ++++ b/include/acpi/processor.h +@@ -352,5 +352,8 @@ static inline void acpi_thermal_cpufreq_exit(void) + return; + } + #endif ++extern void acpi_verify_mwait_data(struct cpuidle_state *state, ++ struct acpi_processor_cx *cx); ++ + + #endif +-- +1.6.2.5 + -- cgit v1.2.3