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authorChen Yu <yu.c.chen@intel.com>2020-07-10 07:12:01 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2020-07-30 18:36:10 +0300
commita472ad2bcea479ba068880125d7273fc95c14b70 (patch)
tree35cdcc5664fb2551b80496ad9b9ec445deb845da /drivers/idle
parentefe9711214e6138a5a2a46ca4068bfce50c03444 (diff)
downloadlinux-a472ad2bcea479ba068880125d7273fc95c14b70.tar.xz
intel_idle: Customize IceLake server support
On ICX platform, the C1E auto-promotion is enabled by default. As a result, the CPU might fall into C1E more offen than previous platforms. Besides, the C1E is not exposed to sysfs on ICX, which is inconsistent with previous server platforms. So disable C1E auto-promotion and expose C1E as a separate idle state, so the C1E and C6 can be disabled via sysfs when necessary. Beside C1 and C1E, the exit latency of C6 was measured by a dedicated tool. However the exit latency(41us) exposed by _CST is much smaller than the one we measured(128us). This is probably due to the _CST uses the exit latency when woken up from PC0+C6, rather than PC6+C6 when C6 was measured. Choose the latter as we need the longest latency in theory. Reported-by: kernel test robot <lkp@intel.com> Tested-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Acked-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Reviewed-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Chen Yu <yu.c.chen@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/idle')
-rw-r--r--drivers/idle/intel_idle.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index 3f86f36dab2b..fd0fa9e7900b 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -752,6 +752,35 @@ static struct cpuidle_state skx_cstates[] __initdata = {
.enter = NULL }
};
+static struct cpuidle_state icx_cstates[] __initdata = {
+ {
+ .name = "C1",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00),
+ .exit_latency = 1,
+ .target_residency = 1,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C1E",
+ .desc = "MWAIT 0x01",
+ .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_ALWAYS_ENABLE,
+ .exit_latency = 4,
+ .target_residency = 4,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .name = "C6",
+ .desc = "MWAIT 0x20",
+ .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 128,
+ .target_residency = 384,
+ .enter = &intel_idle,
+ .enter_s2idle = intel_idle_s2idle, },
+ {
+ .enter = NULL }
+};
+
static struct cpuidle_state atom_cstates[] __initdata = {
{
.name = "C1E",
@@ -1056,6 +1085,12 @@ static const struct idle_cpu idle_cpu_skx __initconst = {
.use_acpi = true,
};
+static const struct idle_cpu idle_cpu_icx __initconst = {
+ .state_table = icx_cstates,
+ .disable_promotion_to_c1e = true,
+ .use_acpi = true,
+};
+
static const struct idle_cpu idle_cpu_avn __initconst = {
.state_table = avn_cstates,
.disable_promotion_to_c1e = true,
@@ -1110,6 +1145,7 @@ static const struct x86_cpu_id intel_idle_ids[] __initconst = {
X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE_L, &idle_cpu_skl),
X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE, &idle_cpu_skl),
X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_X, &idle_cpu_skx),
+ X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_X, &idle_cpu_icx),
X86_MATCH_INTEL_FAM6_MODEL(XEON_PHI_KNL, &idle_cpu_knl),
X86_MATCH_INTEL_FAM6_MODEL(XEON_PHI_KNM, &idle_cpu_knl),
X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT, &idle_cpu_bxt),