Re: [PATCH V2 03/17] platform/x86/intel/pmt/telemetry: Move overlap check to post-decode hook

[Ilpo Järvinen]

On Tue, 24 Mar 2026, David E. Box wrote:

> Update the telemetry namespace to use the new PMT class pre/post decode
> interface. The overlap check, which previously occurred during header
> decode, is now performed in the post-decode hook once header fields are
> populated. This preserves existing behavior while reusing the same header
> decode logic across PMT drivers.
> 
> Signed-off-by: David E. Box <david.e.box@xxxxxxxxxxxxxxx>

For patches #1-#3,

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>

--
 i.

> ---
> 
> V2 - No changes
> 
>  drivers/platform/x86/intel/pmt/class.h     |  1 +
>  drivers/platform/x86/intel/pmt/telemetry.c | 24 ++++++++++++++--------
>  2 files changed, 16 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/platform/x86/intel/pmt/class.h b/drivers/platform/x86/intel/pmt/class.h
> index ff39014b208c..8a0db0ef58c1 100644
> --- a/drivers/platform/x86/intel/pmt/class.h
> +++ b/drivers/platform/x86/intel/pmt/class.h
> @@ -37,6 +37,7 @@ struct intel_pmt_header {
>  	u32	size;
>  	u32	guid;
>  	u8	access_type;
> +	u8	telem_type;
>  };
>  
>  struct intel_pmt_entry {
> diff --git a/drivers/platform/x86/intel/pmt/telemetry.c b/drivers/platform/x86/intel/pmt/telemetry.c
> index bdc7c24a3678..d22f633638be 100644
> --- a/drivers/platform/x86/intel/pmt/telemetry.c
> +++ b/drivers/platform/x86/intel/pmt/telemetry.c
> @@ -58,14 +58,9 @@ struct pmt_telem_priv {
>  	struct intel_pmt_entry		entry[];
>  };
>  
> -static bool pmt_telem_region_overlaps(struct intel_pmt_entry *entry,
> -				      struct device *dev)
> +static bool pmt_telem_region_overlaps(struct device *dev, u32 guid, u32 type)
>  {
> -	u32 guid = readl(entry->disc_table + TELEM_GUID_OFFSET);
> -
>  	if (intel_pmt_is_early_client_hw(dev)) {
> -		u32 type = TELEM_TYPE(readl(entry->disc_table));
> -
>  		if ((type == TELEM_TYPE_PUNIT_FIXED) ||
>  		    (guid == TELEM_CLIENT_FIXED_BLOCK_GUID))
>  			return true;
> @@ -80,15 +75,25 @@ static int pmt_telem_header_decode(struct intel_pmt_entry *entry,
>  	void __iomem *disc_table = entry->disc_table;
>  	struct intel_pmt_header *header = &entry->header;
>  
> -	if (pmt_telem_region_overlaps(entry, dev))
> -		return 1;
> -
>  	header->access_type = TELEM_ACCESS(readl(disc_table));
>  	header->guid = readl(disc_table + TELEM_GUID_OFFSET);
>  	header->base_offset = readl(disc_table + TELEM_BASE_OFFSET);
>  
>  	/* Size is measured in DWORDS, but accessor returns bytes */
>  	header->size = TELEM_SIZE(readl(disc_table));
> +	header->telem_type = TELEM_TYPE(readl(entry->disc_table));
> +
> +	return 0;
> +}
> +
> +static int pmt_telem_post_decode(struct intel_vsec_device *ivdev,
> +				 struct intel_pmt_entry *entry)
> +{
> +	struct intel_pmt_header *header = &entry->header;
> +	struct device *dev = &ivdev->auxdev.dev;
> +
> +	if (pmt_telem_region_overlaps(dev, header->guid, header->telem_type))
> +		return 1;
>  
>  	/*
>  	 * Some devices may expose non-functioning entries that are
> @@ -131,6 +136,7 @@ static struct intel_pmt_namespace pmt_telem_ns = {
>  	.name = "telem",
>  	.xa = &telem_array,
>  	.pmt_header_decode = pmt_telem_header_decode,
> +	.pmt_post_decode = pmt_telem_post_decode,
>  	.pmt_add_endpoint = pmt_telem_add_endpoint,
>  };
>  
>