From 86fc85c75bcd9b0f28afadd60c9f890669b42ba4 Mon Sep 17 00:00:00 2001 From: "David E. Box" Date: Wed, 2 Jul 2025 19:28:28 -0700 Subject: platform/x86/intel/pmt/discovery: Get telemetry attributes MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add intel_pmt_get_features() in PMT Discovery to enable the PMT Telemetry driver to obtain attributes of the aggregated telemetry spaces it enumerates. The function gathers feature flags and associated data (like the number of RMIDs) from each PMT entry, laying the groundwork for a future kernel interface that will allow direct access to telemetry regions based on their capabilities. Signed-off-by: David E. Box Link: https://lore.kernel.org/r/20250703022832.1302928-14-david.e.box@linux.intel.com Reviewed-by: Ilpo Järvinen Signed-off-by: Ilpo Järvinen --- drivers/platform/x86/intel/pmt/discovery.c | 33 ++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) (limited to 'drivers/platform/x86/intel/pmt/discovery.c') diff --git a/drivers/platform/x86/intel/pmt/discovery.c b/drivers/platform/x86/intel/pmt/discovery.c index 4b4fa3137ad2..e72d43b675b4 100644 --- a/drivers/platform/x86/intel/pmt/discovery.c +++ b/drivers/platform/x86/intel/pmt/discovery.c @@ -583,6 +583,39 @@ abort_probe: return ret; } +static void pmt_get_features(struct intel_pmt_entry *entry, struct feature *f) +{ + int num_guids = f->table.header.num_guids; + int i; + + for (i = 0; i < num_guids; i++) { + if (f->table.guids[i] != entry->guid) + continue; + + entry->feature_flags |= BIT(f->id); + + if (feature_layout[f->id] == LAYOUT_RMID) + entry->num_rmids = f->table.rmid.num_rmids; + else + entry->num_rmids = 0; /* entry is kzalloc but set anyway */ + } +} + +void intel_pmt_get_features(struct intel_pmt_entry *entry) +{ + struct feature *feature; + + mutex_lock(&feature_list_lock); + list_for_each_entry(feature, &pmt_feature_list, list) { + if (feature->priv->parent != &entry->ep->pcidev->dev) + continue; + + pmt_get_features(entry, feature); + } + mutex_unlock(&feature_list_lock); +} +EXPORT_SYMBOL_NS_GPL(intel_pmt_get_features, "INTEL_PMT"); + static const struct auxiliary_device_id pmt_features_id_table[] = { { .name = "intel_vsec.discovery" }, {} -- cgit v1.2.3