[PATCH 7/9] x86/mwait-idle: add Granite Rapids Xeon support

[Jan Beulich <jbeulich@xxxxxxxx>]

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>

--- a/xen/arch/x86/cpu/mwait-idle.c
+++ b/xen/arch/x86/cpu/mwait-idle.c
@@ -756,6 +756,34 @@ static struct cpuidle_state __ro_after_i
        {}
 };
 
+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",
@@ -1202,6 +1230,11 @@ static const struct idle_cpu idle_cpu_sp
        .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,
@@ -1276,6 +1309,7 @@ static const struct x86_cpu_id intel_idl
        ICPU(ATOM_GRACEMONT,            gmt),
        ICPU(SAPPHIRERAPIDS_X,          spr),
        ICPU(EMERALDRAPIDS_X,           spr),
+       ICPU(GRANITERAPIDS_X,           gnr),
        ICPU(ATOM_GOLDMONT,             bxt),
        ICPU(ATOM_GOLDMONT_PLUS,        bxt),
        ICPU(ATOM_GOLDMONT_D,           dnv),