From nobody Sun Dec 14 21:49:40 2025 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D47FD2D29D1; Wed, 30 Apr 2025 21:21:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.8 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746048088; cv=none; b=pi2rMfzsHa8oTgjRShGnqO9xRXfEUWFMRpBtJTA7v5qdkmZSSZxxP4vQjxwoWYhIIpIUa+dF25QP7v2nx8vLOvMKAaJTYSzZPzlJoYCWSPDanfnFkYVsXrBgsHjjp8PLGtefI0bliH7QTA0z/+A5u4+PEx52birTzgIxiZpE0NQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746048088; c=relaxed/simple; bh=S7X9Lo3bhqlfGZaVzZxaMlrW5Z1rfRp6vKl8cRpde1M=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=EEgooUM8KbrsjuO27unHp2xZQAEYEHEsNcm47wlhqV/ws7xxp5jZelwxQZOoep7fo07CTg3yNK2u4z8BJmrIp28MOFXsfIPcfbRzw7umCfBvNLXStMQsjGyfebMsJqGC+2EyR8vsX6Og2e/qT04CylCj9ye3YcY37DmX83jNZQc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=E7577Lwv; arc=none smtp.client-ip=192.198.163.8 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="E7577Lwv" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1746048087; x=1777584087; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=S7X9Lo3bhqlfGZaVzZxaMlrW5Z1rfRp6vKl8cRpde1M=; b=E7577LwvtiK5u7SXt8CaNEvUdJIHwCF9kRN8JgERpGaUytVAxR2Y6DB6 IVecKIdAbe8ZOmH0kaC6rY73AwGlGWZCb1iT0AISeZcI8vHlIuyKsZmP1 pINtkMwa8cO1ZdqekuAyyNssqV+Qv67H2UHewPUlmLoRsHruaVTLHAXZo QJmeaEAznA7d+Ie5XllTo+As2tTPpvqAmTRQ1FejEuovFk6usNWGp0KMS 0cxv9ZgeTMCHqFq/Q5WCvhTMIZymV+c/WDCeTbRtlMVxZBuQEdJLfGw5e 0twMCgahwD/lwwkZIPPJAyFoVIpG4Y3o7TJdvnXfmGkGgXtDYJ5IdgQBu g==; X-CSE-ConnectionGUID: Cp0I3vPVRgqVJZU4dSbCfg== X-CSE-MsgGUID: i1lwGtHFTy20BTORVbFUxw== X-IronPort-AV: E=McAfee;i="6700,10204,11419"; a="65257558" X-IronPort-AV: E=Sophos;i="6.15,252,1739865600"; d="scan'208";a="65257558" Received: from orviesa009.jf.intel.com ([10.64.159.149]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Apr 2025 14:21:18 -0700 X-CSE-ConnectionGUID: XG/RkU3qR+G5up4fyTFQAQ== X-CSE-MsgGUID: rutZkDxrTG+Md5jx7DReKA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.15,252,1739865600"; d="scan'208";a="133972313" Received: from agladkov-desk.ger.corp.intel.com (HELO debox1-desk4.lan) ([10.125.110.57]) by orviesa009-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Apr 2025 14:21:18 -0700 From: "David E. Box" To: linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org, david.e.box@linux.intel.com, srinivas.pandruvada@linux.intel.com, andriy.shevchenko@linux.intel.com, ilpo.jarvinen@linux.intel.com, tony.luck@intel.com, xi.pardee@linux.intel.com Cc: hdegoede@redhat.com Subject: [PATCH 14/15] platform/x86/intel/pmt/telemetry: Add API to retrieve telemetry regions by feature Date: Wed, 30 Apr 2025 14:21:03 -0700 Message-ID: <20250430212106.369208-15-david.e.box@linux.intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250430212106.369208-1-david.e.box@linux.intel.com> References: <20250430212106.369208-1-david.e.box@linux.intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 --- 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 @@ */ =20 #include +#include +#include #include #include #include #include #include +#include +#include #include #include #include #include -#include +#include =20 #include "class.h" =20 @@ -209,6 +213,88 @@ int pmt_telem_get_endpoint_info(int devid, struct tele= m_endpoint_info *info) } EXPORT_SYMBOL_NS_GPL(pmt_telem_get_endpoint_info, "INTEL_PMT_TELEMETRY"); =20 +static int pmt_copy_region(struct telemetry_region *region, + struct intel_pmt_entry *entry) +{ + + struct oobmsm_plat_info *plat_info; + + plat_info =3D intel_vsec_get_mapping(entry->ep->pcidev); + if (IS_ERR(plat_info)) + return PTR_ERR(plat_info); + + region->plat_info =3D *plat_info; + region->guid =3D entry->guid; + region->addr =3D entry->ep->base; + region->size =3D entry->size; + region->num_rmids =3D entry->num_rmids; + + return 0; +} + +static void pmt_feature_group_release(struct kref *kref) +{ + struct pmt_feature_group *feature_group; + + feature_group =3D container_of(kref, struct pmt_feature_group, kref); + kfree(feature_group); +} + +struct pmt_feature_group *intel_pmt_get_regions_by_feature(enum pmt_featur= e_id id) +{ + struct pmt_feature_group *feature_group; + struct telemetry_region *region; + struct intel_pmt_entry *entry; + unsigned long idx; + int count =3D 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 =3D struct_size(feature_group, regions, count); + feature_group =3D kzalloc(size, GFP_KERNEL); + if (!feature_group) + return ERR_PTR(-ENOMEM); + + feature_group->count =3D count; + + region =3D feature_group->regions; + xa_for_each(&telem_array, idx, entry) { + int ret; + + if (!(entry->feature_flags & BIT(id))) + continue; + + ret =3D 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 "); 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 --=20 2.43.0