From 22e580d07f6529a395c129575127ea6d860aed3a Mon Sep 17 00:00:00 2001 From: Bockholdt Arne Date: Tue, 26 Nov 2013 07:13:57 +0000 Subject: intel_idle: Fixed C6 state on Avoton/Rangeley processors Corrected the MWAIT flag for C-State C6 on Intel Avoton/Rangeley processors. Signed-off-by: Arne Bockholdt Acked-by: Len Brown Signed-off-by: Rafael J. Wysocki --- drivers/idle/intel_idle.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/idle/intel_idle.c') diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index cbd4e9abc47..92d1206482a 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -329,7 +329,7 @@ static struct cpuidle_state atom_cstates[] __initdata = { { .enter = NULL } }; -static struct cpuidle_state avn_cstates[CPUIDLE_STATE_MAX] = { +static struct cpuidle_state avn_cstates[] __initdata = { { .name = "C1-AVN", .desc = "MWAIT 0x00", @@ -340,7 +340,7 @@ static struct cpuidle_state avn_cstates[CPUIDLE_STATE_MAX] = { { .name = "C6-AVN", .desc = "MWAIT 0x51", - .flags = MWAIT2flg(0x58) | CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TLB_FLUSHED, + .flags = MWAIT2flg(0x51) | CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TLB_FLUSHED, .exit_latency = 15, .target_residency = 45, .enter = &intel_idle }, -- cgit v1.2.3-70-g09d2 From 40e2d7f9b5dae048789c64672bf3027fbb663ffa Mon Sep 17 00:00:00 2001 From: Len Brown Date: Wed, 18 Dec 2013 16:44:57 -0500 Subject: x86 idle: Repair large-server 50-watt idle-power regression Linux 3.10 changed the timing of how thread_info->flags is touched: x86: Use generic idle loop (7d1a941731fabf27e5fb6edbebb79fe856edb4e5) This caused Intel NHM-EX and WSM-EX servers to experience a large number of immediate MONITOR/MWAIT break wakeups, which caused cpuidle to demote from deep C-states to shallow C-states, which caused these platforms to experience a significant increase in idle power. Note that this issue was already present before the commit above, however, it wasn't seen often enough to be noticed in power measurements. Here we extend an errata workaround from the Core2 EX "Dunnington" to extend to NHM-EX and WSM-EX, to prevent these immediate returns from MWAIT, reducing idle power on these platforms. While only acpi_idle ran on Dunnington, intel_idle may also run on these two newer systems. As of today, there are no other models that are known to need this tweak. Link: http://lkml.kernel.org/r/CAJvTdK=%2BaNN66mYpCGgbHGCHhYQAKx-vB0kJSWjVpsNb_hOAtQ@mail.gmail.com Signed-off-by: Len Brown Link: http://lkml.kernel.org/r/baff264285f6e585df757d58b17788feabc68918.1387403066.git.len.brown@intel.com Cc: # 3.12.x, 3.11.x, 3.10.x Signed-off-by: H. Peter Anvin --- arch/x86/kernel/cpu/intel.c | 3 ++- drivers/idle/intel_idle.c | 3 +++ 2 files changed, 5 insertions(+), 1 deletion(-) (limited to 'drivers/idle/intel_idle.c') diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c index dc1ec0dff93..ea04b342c02 100644 --- a/arch/x86/kernel/cpu/intel.c +++ b/arch/x86/kernel/cpu/intel.c @@ -387,7 +387,8 @@ static void init_intel(struct cpuinfo_x86 *c) set_cpu_cap(c, X86_FEATURE_PEBS); } - if (c->x86 == 6 && c->x86_model == 29 && cpu_has_clflush) + if (c->x86 == 6 && cpu_has_clflush && + (c->x86_model == 29 || c->x86_model == 46 || c->x86_model == 47)) set_cpu_cap(c, X86_FEATURE_CLFLUSH_MONITOR); #ifdef CONFIG_X86_64 diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index 92d1206482a..f80b700f821 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -377,6 +377,9 @@ static int intel_idle(struct cpuidle_device *dev, if (!current_set_polling_and_test()) { + if (this_cpu_has(X86_FEATURE_CLFLUSH_MONITOR)) + clflush((void *)¤t_thread_info()->flags); + __monitor((void *)¤t_thread_info()->flags, 0, 0); smp_mb(); if (!need_resched()) -- cgit v1.2.3-70-g09d2