[1/2] intel_idle: add Grand Ridge SoC support

From: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

Add Intel Grand Ridge SoC C-states, which are C1, C1E, and C6S.

The Grand Ridge SoC is built with modules, each module includes 4 cores
(Crestmont microarchitecture). There is one L2 cache per module, shared between
the 4 cores.

There is no core C6 state, but there is C6S state, which has module scope:
when all 4 cores request C6S, the entire module (4 cores + L2 cache) enters the
low power state.

Package C6 is not supported by Grand Ridge SoC.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
---
 drivers/idle/intel_idle.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)


base-commit: ee96d5c15517fbdf136aeff1919646e843fbb6f3

On Thu, Dec 14, 2023 at 5:56 PM Artem Bityutskiy <dedekind1@gmail.com> wrote:
>
> From: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
>
> Add Intel Grand Ridge SoC C-states, which are C1, C1E, and C6S.
>
> The Grand Ridge SoC is built with modules, each module includes 4 cores
> (Crestmont microarchitecture). There is one L2 cache per module, shared between
> the 4 cores.
>
> There is no core C6 state, but there is C6S state, which has module scope:
> when all 4 cores request C6S, the entire module (4 cores + L2 cache) enters the
> low power state.
>
> Package C6 is not supported by Grand Ridge SoC.
>
> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
> ---
>  drivers/idle/intel_idle.c | 36 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 36 insertions(+)
>
> diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
> index cfd0b24fd7f1..3b846d4f8707 100644
> --- a/drivers/idle/intel_idle.c
> +++ b/drivers/idle/intel_idle.c
> @@ -1271,6 +1271,35 @@ static struct cpuidle_state snr_cstates[] __initdata = {
>                 .enter = NULL }
>  };
>
> +static struct cpuidle_state grr_cstates[] __initdata = {
> +       {
> +               .name = "C1",
> +               .desc = "MWAIT 0x00",
> +               .flags = MWAIT2flg(0x00) | CPUIDLE_FLAG_ALWAYS_ENABLE,
> +               .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 = 2,
> +               .target_residency = 10,
> +               .enter = &intel_idle,
> +               .enter_s2idle = intel_idle_s2idle, },
> +       {
> +               .name = "C6S",
> +               .desc = "MWAIT 0x22",
> +               .flags = MWAIT2flg(0x22) | CPUIDLE_FLAG_TLB_FLUSHED,
> +               .exit_latency = 140,
> +               .target_residency = 500,
> +               .enter = &intel_idle,
> +               .enter_s2idle = intel_idle_s2idle, },
> +       {
> +               .enter = NULL }
> +};
> +
>  static const struct idle_cpu idle_cpu_nehalem __initconst = {
>         .state_table = nehalem_cstates,
>         .auto_demotion_disable_flags = NHM_C1_AUTO_DEMOTE | NHM_C3_AUTO_DEMOTE,
> @@ -1420,6 +1449,12 @@ static const struct idle_cpu idle_cpu_snr __initconst = {
>         .use_acpi = true,
>  };
>
> +static const struct idle_cpu idle_cpu_grr __initconst = {
> +       .state_table = grr_cstates,
> +       .disable_promotion_to_c1e = true,
> +       .use_acpi = true,
> +};
> +
>  static const struct x86_cpu_id intel_idle_ids[] __initconst = {
>         X86_MATCH_INTEL_FAM6_MODEL(NEHALEM_EP,          &idle_cpu_nhx),
>         X86_MATCH_INTEL_FAM6_MODEL(NEHALEM,             &idle_cpu_nehalem),
> @@ -1466,6 +1501,7 @@ static const struct x86_cpu_id intel_idle_ids[] __initconst = {
>         X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT_PLUS,  &idle_cpu_bxt),
>         X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT_D,     &idle_cpu_dnv),
>         X86_MATCH_INTEL_FAM6_MODEL(ATOM_TREMONT_D,      &idle_cpu_snr),
> +       X86_MATCH_INTEL_FAM6_MODEL(ATOM_CRESTMONT,      &idle_cpu_grr),
>         {}
>  };
>
>
> base-commit: ee96d5c15517fbdf136aeff1919646e843fbb6f3
> --

Applied as 6.8 material along with the [2/2], thanks!