From aa3fe5dfe1caee97122a14a44cad85e0885a0087 Mon Sep 17 00:00:00 2001 From: Len Brown Date: Wed, 2 Jul 2014 14:50:17 +0200 Subject: [PATCH] mwait-idle: support Bay Trail Bay Trail (BYT) is a family of Silvermont-core Atom Processor SOCs, including the Intel Atom Processor Z36xxx and Z37xxx Series. Although it shares the Silvermont core with Avoton, BYT is optimized for mobile, and thus it supports different power saving CPU idle states. Note that not all versions of Bay Trail HW support all of the states listed in the driver. Signed-off-by: Len Brown Tested-by: Aubrey Li Signed-off-by: Jan Beulich --- xen/arch/x86/cpu/mwait-idle.c | 46 +++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/xen/arch/x86/cpu/mwait-idle.c b/xen/arch/x86/cpu/mwait-idle.c index 744a3d7f6d..06f4a3301a 100644 --- a/xen/arch/x86/cpu/mwait-idle.c +++ b/xen/arch/x86/cpu/mwait-idle.c @@ -187,6 +187,46 @@ static const struct cpuidle_state snb_cstates[] = { {} }; +static const struct cpuidle_state byt_cstates[] = { + { + .name = "C1-BYT", + .flags = MWAIT2flg(0x00), + .exit_latency = 1, + .target_residency = 1, + }, + { + .name = "C1E-BYT", + .flags = MWAIT2flg(0x01), + .exit_latency = 15, + .target_residency = 30, + }, + { + .name = "C6N-BYT", + .flags = MWAIT2flg(0x58) | CPUIDLE_FLAG_TLB_FLUSHED, + .exit_latency = 40, + .target_residency = 275, + }, + { + .name = "C6S-BYT", + .flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TLB_FLUSHED, + .exit_latency = 140, + .target_residency = 560, + }, + { + .name = "C7-BYT", + .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED, + .exit_latency = 1200, + .target_residency = 1500, + }, + { + .name = "C7S-BYT", + .flags = MWAIT2flg(0x64) | CPUIDLE_FLAG_TLB_FLUSHED, + .exit_latency = 10000, + .target_residency = 20000, + }, + {} +}; + static const struct cpuidle_state ivb_cstates[] = { { .name = "C1-IVB", @@ -442,6 +482,11 @@ static const struct idle_cpu idle_cpu_snb = { .disable_promotion_to_c1e = 1, }; +static const struct idle_cpu idle_cpu_byt = { + .state_table = byt_cstates, + .disable_promotion_to_c1e = 1, +}; + static const struct idle_cpu idle_cpu_ivb = { .state_table = ivb_cstates, .disable_promotion_to_c1e = 1, @@ -474,6 +519,7 @@ static struct intel_idle_id { ICPU(0x26, lincroft), ICPU(0x2a, snb), ICPU(0x2d, snb), + ICPU(0x37, byt), ICPU(0x3a, ivb), ICPU(0x3e, ivb), ICPU(0x3c, hsw), -- 2.39.5