[xen stable-4.19] x86/mwait-idle: add Granite Rapids Xeon support

[patchbot@xxxxxxx]

commit ff29055ccd8d7039c02b39b96194481b08341a18
Author:     Artem Bityutskiy <artem.bityutskiy@xxxxxxxxxxxxxxx>
AuthorDate: Tue Jul 22 09:58:06 2025 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jul 22 09:58:06 2025 +0200

    x86/mwait-idle: add Granite Rapids Xeon support
    
    Add Granite Rapids Xeon C-states, which are C1, C1E, C6, and C6P.
    
    Comparing to previous Xeon Generations (e.g., Emerald Rapids), C6
    requests end up only in core C6 state, and no package C-state promotion
    takes place even if all cores in the package are in core C6.
    
    C6P requests also end up in core C6, but if all cores have requested
    C6P, the SoC will enter the package C6 state.
    
    Signed-off-by: Artem Bityutskiy <artem.bityutskiy@xxxxxxxxxxxxxxx>
    Link: 
https://patch.msgid.link/20240806160310.3719205-1-artem.bityutskiy@xxxxxxxxxxxxxxx
    [ rjw: Changelog edits ]
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
    Origin: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
370406bf5738
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: 3c7186b2a82b23265650d404d27a41dcfa956191
    master date: 2025-07-09 11:02:08 +0200
---
 xen/arch/x86/cpu/mwait-idle.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/xen/arch/x86/cpu/mwait-idle.c b/xen/arch/x86/cpu/mwait-idle.c
index f0fbd2c3c1..85ca01b7d7 100644
--- a/xen/arch/x86/cpu/mwait-idle.c
+++ b/xen/arch/x86/cpu/mwait-idle.c
@@ -756,6 +756,34 @@ static struct cpuidle_state __read_mostly spr_cstates[] = {
        {}
 };
 
+static const struct cpuidle_state gnr_cstates[] = {
+       {
+               .name = "C1",
+               .flags = MWAIT2flg(0x00),
+               .exit_latency = 1,
+               .target_residency = 1,
+       },
+       {
+               .name = "C1E",
+               .flags = MWAIT2flg(0x01),
+               .exit_latency = 4,
+               .target_residency = 4,
+       },
+       {
+               .name = "C6",
+               .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
+               .exit_latency = 170,
+               .target_residency = 650,
+       },
+       {
+               .name = "C6P",
+               .flags = MWAIT2flg(0x21) | CPUIDLE_FLAG_TLB_FLUSHED,
+               .exit_latency = 210,
+               .target_residency = 1000,
+       },
+       {}
+};
+
 static const struct cpuidle_state atom_cstates[] = {
        {
                .name = "C1E",
@@ -1218,6 +1246,11 @@ static struct idle_cpu __read_mostly idle_cpu_spr = {
        .c1e_promotion = C1E_PROMOTION_DISABLE,
 };
 
+static const struct idle_cpu idle_cpu_gnr = {
+       .state_table = gnr_cstates,
+       .c1e_promotion = C1E_PROMOTION_DISABLE,
+};
+
 static const struct idle_cpu idle_cpu_avn = {
        .state_table = avn_cstates,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
@@ -1296,6 +1329,7 @@ static const struct x86_cpu_id intel_idle_ids[] 
__initconstrel = {
        ICPU(ATOM_GRACEMONT,            gmt),
        ICPU(SAPPHIRERAPIDS_X,          spr),
        ICPU(EMERALDRAPIDS_X,           spr),
+       ICPU(GRANITERAPIDS_X,           gnr),
        ICPU(XEON_PHI_KNL,              knl),
        ICPU(XEON_PHI_KNM,              knl),
        ICPU(ATOM_GOLDMONT,             bxt),
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.19