On 1/1/2026 6:42 AM, Zide Chen wrote:
> In the Intel uncore self-describing mechanism, the Global Control
> Register freeze_all bit is SoC-wide and propagates to all uncore PMUs.
>
> On Diamond Rapids, this bit is set at power-on, unlike some prior
> platforms. Add a global_init callback to unfreeze all PMON units.
>
> Signed-off-by: Zide Chen <zide.chen@intel.com>
> ---
> V2: New patch
>
> arch/x86/events/intel/uncore.c | 16 ++++++++++++++++
> arch/x86/events/intel/uncore.h | 2 ++
> arch/x86/events/intel/uncore_discovery.c | 3 +++
> 3 files changed, 21 insertions(+)
>
> diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
> index 1565c0418fb1..080b6870a88d 100644
> --- a/arch/x86/events/intel/uncore.c
> +++ b/arch/x86/events/intel/uncore.c
> @@ -1697,6 +1697,21 @@ static int __init uncore_mmio_init(void)
> return ret;
> }
>
> +static int uncore_mmio_global_init(u64 ctl)
> +{
> + void __iomem *io_addr;
> +
> + io_addr = ioremap(ctl, sizeof(ctl));
> + if (!io_addr)
> + return -ENOMEM;
> +
> + /* Clear bit 0, all other bits are reserved */
Better make the comment clearer, like this.
/* Clear freeze bit (bit 0) to enable all counters. */
Others look good to me.
Reviewed-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
> + writel(0, io_addr);
> +
> + iounmap(io_addr);
> + return 0;
> +}
> +
> static const struct uncore_plat_init nhm_uncore_init __initconst = {
> .cpu_init = nhm_uncore_cpu_init,
> };
> @@ -1839,6 +1854,7 @@ static const struct uncore_plat_init dmr_uncore_init __initconst = {
> .domain[0].units_ignore = dmr_uncore_imh_units_ignore,
> .domain[1].discovery_base = CBB_UNCORE_DISCOVERY_MSR,
> .domain[1].units_ignore = dmr_uncore_cbb_units_ignore,
> + .domain[1].global_init = uncore_mmio_global_init,
> };
>
> static const struct uncore_plat_init generic_uncore_init __initconst = {
> diff --git a/arch/x86/events/intel/uncore.h b/arch/x86/events/intel/uncore.h
> index 83d01a9cefc0..55e3aebf4b5e 100644
> --- a/arch/x86/events/intel/uncore.h
> +++ b/arch/x86/events/intel/uncore.h
> @@ -51,6 +51,8 @@ struct uncore_discovery_domain {
> /* MSR address or PCI device used as the discovery base */
> u32 discovery_base;
> bool base_is_pci;
> + int (*global_init)(u64 ctl);
> +
> /* The units in the discovery table should be ignored. */
> int *units_ignore;
> };
> diff --git a/arch/x86/events/intel/uncore_discovery.c b/arch/x86/events/intel/uncore_discovery.c
> index 6f409e0b4722..3a5a3876b74c 100644
> --- a/arch/x86/events/intel/uncore_discovery.c
> +++ b/arch/x86/events/intel/uncore_discovery.c
> @@ -286,6 +286,9 @@ static int __parse_discovery_table(struct uncore_discovery_domain *domain,
> if (!io_addr)
> return -ENOMEM;
>
> + if (domain->global_init && domain->global_init(global.ctl))
> + return -ENODEV;
> +
> /* Parsing Unit Discovery State */
> for (i = 0; i < global.max_units; i++) {
> memcpy_fromio(&unit, io_addr + (i + 1) * (global.stride * 8),