[xen stable-4.20] x86/mwait-idle: Add Meteorlake support

[patchbot@xxxxxxx]

commit 733dd65888186988d03999f34769bc7d389846e2
Author:     Zhang Rui <rui.zhang@xxxxxxxxx>
AuthorDate: Tue Jul 22 09:51:05 2025 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jul 22 09:51:05 2025 +0200

    x86/mwait-idle: Add Meteorlake support
    
    Add intel_idle support for MeteorLake.
    
    C1 and C1E states on Meteorlake are mutually exclusive, like Alderlake
    and Raptorlake, but they have little latency difference with measureable
    power difference, so always enable "C1E promotion" bit and expose C1E
    only.
    
    Expose C6 because it has less power compared with C1E, and smaller
    latency compared with C8/C10.
    
    Ignore C8 and expose C10, because C8 does not show latency advantage
    compared with C10.
    
    Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
    Origin: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
eeae55ed9c0a
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: 433ed7d4f8edb3adbe6a7c717afcb81b812f4236
    master date: 2025-07-09 11:01:03 +0200
---
 xen/arch/x86/cpu/mwait-idle.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/xen/arch/x86/cpu/mwait-idle.c b/xen/arch/x86/cpu/mwait-idle.c
index 386f7f3dc2..0e1d1a0074 100644
--- a/xen/arch/x86/cpu/mwait-idle.c
+++ b/xen/arch/x86/cpu/mwait-idle.c
@@ -678,6 +678,28 @@ static struct cpuidle_state __read_mostly adl_l_cstates[] 
= {
        {}
 };
 
+static const struct cpuidle_state mtl_l_cstates[] = {
+       {
+               .name = "C1E",
+               .flags = MWAIT2flg(0x01),
+               .exit_latency = 1,
+               .target_residency = 1,
+       },
+       {
+               .name = "C6",
+               .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
+               .exit_latency = 140,
+               .target_residency = 420,
+       },
+       {
+               .name = "C10",
+               .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED,
+               .exit_latency = 310,
+               .target_residency = 930,
+       },
+       {}
+};
+
 static const struct cpuidle_state gmt_cstates[] = {
        {
                .name = "C1",
@@ -1117,6 +1139,10 @@ static struct idle_cpu __read_mostly idle_cpu_adl_l = {
        .state_table = adl_l_cstates,
 };
 
+static const struct idle_cpu idle_cpu_mtl_l = {
+       .state_table = mtl_l_cstates,
+};
+
 static const struct idle_cpu idle_cpu_gmt = {
        .state_table = gmt_cstates,
 };
@@ -1186,6 +1212,7 @@ static const struct x86_cpu_id intel_idle_ids[] 
__initconstrel = {
        ICPU(ICELAKE_D,                 icx),
        ICPU(ALDERLAKE,                 adl),
        ICPU(ALDERLAKE_L,               adl_l),
+       ICPU(METEORLAKE_L,              mtl_l),
        ICPU(ATOM_GRACEMONT,            gmt),
        ICPU(SAPPHIRERAPIDS_X,          spr),
        ICPU(EMERALDRAPIDS_X,           spr),
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.20