[Xen-devel] [PATCH 1/2] x86/mwait-idle: add CPU model 0x4a (Atom Z34xx series)

["Jan Beulich" <JBeulich@xxxxxxxx>]

Add CPU ID for Atom Z34xx processors. Datasheets indicate support for this,
detailed information about potential quirks or limitations are missing, though.
So we just reuse the definition from official BSP code.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
[Linux commit: 5e7ec268fd48d63cfd0e3a9be6c6443f01673bd4]
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/cpu/mwait-idle.c
+++ b/xen/arch/x86/cpu/mwait-idle.c
@@ -580,6 +580,40 @@ static const struct cpuidle_state atom_c
        {}
 };
 
+static const struct cpuidle_state tangier_cstates[] = {
+       {
+               .name = "C1-TNG",
+               .flags = MWAIT2flg(0x00),
+               .exit_latency = 1,
+               .target_residency = 4,
+       },
+       {
+               .name = "C4-TNG",
+               .flags = MWAIT2flg(0x30) | CPUIDLE_FLAG_TLB_FLUSHED,
+               .exit_latency = 100,
+               .target_residency = 400,
+       },
+       {
+               .name = "C6-TNG",
+               .flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TLB_FLUSHED,
+               .exit_latency = 140,
+               .target_residency = 560,
+       },
+       {
+               .name = "C7-TNG",
+               .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED,
+               .exit_latency = 1200,
+               .target_residency = 4000,
+       },
+       {
+               .name = "C9-TNG",
+               .flags = MWAIT2flg(0x64) | CPUIDLE_FLAG_TLB_FLUSHED,
+               .exit_latency = 10000,
+               .target_residency = 20000,
+       },
+       {}
+};
+
 static const struct cpuidle_state avn_cstates[] = {
        {
                .name = "C1-AVN",
@@ -800,6 +834,10 @@ static const struct idle_cpu idle_cpu_at
        .state_table = atom_cstates,
 };
 
+static const struct idle_cpu idle_cpu_tangier = {
+       .state_table = tangier_cstates,
+};
+
 static const struct idle_cpu idle_cpu_lincroft = {
        .state_table = atom_cstates,
        .auto_demotion_disable_flags = ATM_LNC_C6_AUTO_DEMOTE,
@@ -889,6 +927,7 @@ static const struct x86_cpu_id intel_idl
        ICPU(0x2d, snb),
        ICPU(0x36, atom),
        ICPU(0x37, byt),
+       ICPU(0x4a, tangier),
        ICPU(0x4c, cht),
        ICPU(0x3a, ivb),
        ICPU(0x3e, ivt),

Attachment: x86-mwait-idle-Z34xx.patch
Description: Text document

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel