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Message-ID: <20250430212106.369208-15-david.e.box@linux.intel.com>
Date: Wed, 30 Apr 2025 14:21:03 -0700
From: "David E. Box" <david.e.box@...ux.intel.com>
To: linux-kernel@...r.kernel.org,
platform-driver-x86@...r.kernel.org,
david.e.box@...ux.intel.com,
srinivas.pandruvada@...ux.intel.com,
andriy.shevchenko@...ux.intel.com,
ilpo.jarvinen@...ux.intel.com,
tony.luck@...el.com,
xi.pardee@...ux.intel.com
Cc: hdegoede@...hat.com
Subject: [PATCH 14/15] platform/x86/intel/pmt/telemetry: Add API to retrieve telemetry regions by feature
Introduce a new API, intel_pmt_get_regions_by_feature(), that gathers
telemetry regions based on a provided capability flag. This API enables
retrieval of regions with various capabilities (for example, RMID-based
telemetry) and provides a unified interface for accessing them. Resource
management is handled via reference counting using
intel_pmt_put_feature_group().
Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
---
drivers/platform/x86/intel/pmt/telemetry.c | 89 +++++++++++++++++++++-
include/linux/intel_vsec.h | 15 ++++
2 files changed, 103 insertions(+), 1 deletion(-)
diff --git a/drivers/platform/x86/intel/pmt/telemetry.c b/drivers/platform/x86/intel/pmt/telemetry.c
index 58d06749e417..d071dca4a689 100644
--- a/drivers/platform/x86/intel/pmt/telemetry.c
+++ b/drivers/platform/x86/intel/pmt/telemetry.c
@@ -9,16 +9,20 @@
*/
#include <linux/auxiliary_bus.h>
+#include <linux/bitops.h>
+#include <linux/err.h>
#include <linux/intel_pmt_features.h>
#include <linux/intel_vsec.h>
#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/overflow.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/uaccess.h>
-#include <linux/overflow.h>
+#include <linux/xarray.h>
#include "class.h"
@@ -209,6 +213,88 @@ int pmt_telem_get_endpoint_info(int devid, struct telem_endpoint_info *info)
}
EXPORT_SYMBOL_NS_GPL(pmt_telem_get_endpoint_info, "INTEL_PMT_TELEMETRY");
+static int pmt_copy_region(struct telemetry_region *region,
+ struct intel_pmt_entry *entry)
+{
+
+ struct oobmsm_plat_info *plat_info;
+
+ plat_info = intel_vsec_get_mapping(entry->ep->pcidev);
+ if (IS_ERR(plat_info))
+ return PTR_ERR(plat_info);
+
+ region->plat_info = *plat_info;
+ region->guid = entry->guid;
+ region->addr = entry->ep->base;
+ region->size = entry->size;
+ region->num_rmids = entry->num_rmids;
+
+ return 0;
+}
+
+static void pmt_feature_group_release(struct kref *kref)
+{
+ struct pmt_feature_group *feature_group;
+
+ feature_group = container_of(kref, struct pmt_feature_group, kref);
+ kfree(feature_group);
+}
+
+struct pmt_feature_group *intel_pmt_get_regions_by_feature(enum pmt_feature_id id)
+{
+ struct pmt_feature_group *feature_group;
+ struct telemetry_region *region;
+ struct intel_pmt_entry *entry;
+ unsigned long idx;
+ int count = 0;
+ size_t size;
+
+ if (!pmt_feature_id_is_valid(id))
+ return ERR_PTR(-EINVAL);
+
+ guard(mutex)(&ep_lock);
+ xa_for_each(&telem_array, idx, entry) {
+ if (entry->feature_flags & BIT(id))
+ count++;
+ }
+
+ if (!count)
+ return ERR_PTR(-ENOENT);
+
+ size = struct_size(feature_group, regions, count);
+ feature_group = kzalloc(size, GFP_KERNEL);
+ if (!feature_group)
+ return ERR_PTR(-ENOMEM);
+
+ feature_group->count = count;
+
+ region = feature_group->regions;
+ xa_for_each(&telem_array, idx, entry) {
+ int ret;
+
+ if (!(entry->feature_flags & BIT(id)))
+ continue;
+
+ ret = pmt_copy_region(region, entry);
+ if (ret) {
+ kfree(feature_group);
+ return ERR_PTR(ret);
+ }
+ region++;
+ }
+
+ kref_init(&feature_group->kref);
+
+ return feature_group;
+}
+EXPORT_SYMBOL(intel_pmt_get_regions_by_feature);
+
+void intel_pmt_put_feature_group(struct pmt_feature_group *feature_group)
+{
+ kref_put(&feature_group->kref, pmt_feature_group_release);
+}
+EXPORT_SYMBOL(intel_pmt_put_feature_group);
+
int pmt_telem_read(struct telem_endpoint *ep, u32 id, u64 *data, u32 count)
{
u32 offset, size;
@@ -353,3 +439,4 @@ MODULE_AUTHOR("David E. Box <david.e.box@...ux.intel.com>");
MODULE_DESCRIPTION("Intel PMT Telemetry driver");
MODULE_LICENSE("GPL v2");
MODULE_IMPORT_NS("INTEL_PMT");
+MODULE_IMPORT_NS("INTEL_VSEC");
diff --git a/include/linux/intel_vsec.h b/include/linux/intel_vsec.h
index f63e67398a8e..f41d2ec974fd 100644
--- a/include/linux/intel_vsec.h
+++ b/include/linux/intel_vsec.h
@@ -220,4 +220,19 @@ static inline struct oobmsm_plat_info *intel_vsec_get_mapping(struct pci_dev *pd
return ERR_PTR(-ENODEV);
}
#endif
+
+#if IS_ENABLED(CONFIG_INTEL_PMT_TELEMETRY)
+struct pmt_feature_group *
+intel_pmt_get_regions_by_feature(enum pmt_feature_id id);
+
+void intel_pmt_put_feature_group(struct pmt_feature_group *feature_group);
+#else
+static inline struct pmt_feature_group *
+intel_pmt_get_regions_by_feature(enum pmt_feature_id id)
+{ return ERR_PTR(-ENODEV); }
+
+static inline void
+intel_pmt_put_feature_group(struct pmt_feature_group *feature_group) {}
+#endif
+
#endif
--
2.43.0
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