From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.14]) (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 4212653D0CB for ; Wed, 16 Sep 2026 23:13:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.14 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789600437; cv=none; b=dnGJGvIkgs/Z3l3FbR4u5+SW/ZDVDCvWWmXoU70aTNNGDBhOW6bgNqCuKOoJ7yvd1YaAxzMbC/ySt8gsXVpc29mLmgosEKTUUQd+Nwa3V51vGYbEuRsKWy5kDFJ9xQgiJZGE0deEia40UOnbPkx28dYhpfHe7fVq23XzdjRFbjU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789600437; c=relaxed/simple; bh=eVmXOFlkRN5iaG26DigKaIsj/0UtV30S+C6g+/Kkx1s=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=clWxde0KsbTxg5vVxXSFdMSKV4gYGRGZqfXyLd/UQBV634+AlQH1vcGPCr/Ad7uazKbC7uw8S5MZmvs7umPHzluSzyOPD7l/J6lrgQYsouRi3DZcnZ3A1bxMUzF6ArWcfLKNuoLzcGYPrSppTemXASprLwPYoZL0lmiuG6wCB6I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=YRWykCJ0; arc=none smtp.client-ip=198.175.65.14 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="YRWykCJ0" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1789600435; x=1821136435; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=eVmXOFlkRN5iaG26DigKaIsj/0UtV30S+C6g+/Kkx1s=; b=YRWykCJ0a/s++c8C56QwnAUjC1qZqNMKcCpaEoPqkv5t+EcJ+SOpvaL7 xarwtrGbSqXMsoLECh9AYoHyfZqtVXJL4qvY7XYfF9iiAL4sIw2myiyn0 /MVRB6lpWUgmVzwyMkVZ5K3K2QaF/HNK9j43EkY5YV0AyclQG821oUgP1 rTu7yH19AyLWDUFyZ8nHhrt4kPftzj+5pg437v5thb7nsH+ISmy5MNKsr GCz8Fa0Wu5I0y+tC0bPKABfUR+pDynXpxUwZT0QMa0P0myI23kvNXpfyk y84NQ0+8zriVYSmt4Ls5s9VOiwyTnI7w7eEOmW0NmVzWKF0+hgTGVz6xi Q==; X-CSE-ConnectionGUID: FUk1gA3RRLyo3qxA5G+8ow== X-CSE-MsgGUID: lZAhxQzARjuVjc5svG0fww== X-IronPort-AV: E=McAfee;i="6800,10657,11905"; a="93861519" X-IronPort-AV: E=Sophos;i="6.27,103,1787036400"; d="scan'208";a="93861519" Received: from orviesa004.jf.intel.com ([10.64.159.144]) by orvoesa106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Sep 2026 16:13:40 -0700 X-CSE-ConnectionGUID: gYXTOZHxTEm1wFn0kBsWQg== X-CSE-MsgGUID: YJz8K/Q5QYKeu1GlIvDOGQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,103,1787036400"; d="scan'208";a="277231501" Received: from khuang2-desk.gar.corp.intel.com (HELO agluck-desk3.home.arpa) ([10.124.223.219]) by orviesa004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Sep 2026 16:13:40 -0700 From: Tony Luck To: Fenghua Yu , Reinette Chatre , Maciej Wieczor-Retman , Peter Newman , James Morse , Babu Moger , Drew Fustini , Dave Martin , Chen Yu , David E Box , x86@kernel.org Cc: Christoph Hellwig , linux-kernel@vger.kernel.org, patches@lists.linux.dev, Tony Luck Subject: [PATCH v12 22/25] platform/x86/intel/pmt: Inform resctrl when MMIO maps are being removed Date: Wed, 16 Sep 2026 16:13:17 -0700 Message-ID: <20260916231320.14502-23-tony.luck@intel.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260916231320.14502-1-tony.luck@intel.com> References: <20260916231320.14502-1-tony.luck@intel.com> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Before destroying devices, tell resctrl that the virtual addresses supplied by an earlier call to intel_pmt_get_regions_by_feature() are about to be invalidated and should not be used again. Avoid A-B deadlock between ep_lock and aet_register_lock. Signed-off-by: Tony Luck --- v12: Ilpo: Downgrade "can't happen" dev_warn() to dev_debug() Ilpo's suggestion to use guard(mutex) moot due to refactor. Reinette: Refactor and eliminate "u32 ret" and s/packages/package/ Reinette: Explain ep_lock release/acquire. --- drivers/platform/x86/intel/pmt/telemetry.c | 31 ++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/drivers/platform/x86/intel/pmt/telemetry.c b/drivers/platform/x86/intel/pmt/telemetry.c index bf0c9295feb3..527563043777 100644 --- a/drivers/platform/x86/intel/pmt/telemetry.c +++ b/drivers/platform/x86/intel/pmt/telemetry.c @@ -366,12 +366,43 @@ pmt_telem_find_and_register_endpoint(struct device *dev, u32 guid, u16 pos) } EXPORT_SYMBOL_NS_GPL(pmt_telem_find_and_register_endpoint, "INTEL_PMT_TELEMETRY"); +static int pmt_telem_get_package_id(struct pmt_telem_priv *priv) +{ + int i; + + for (i = 0; i < priv->num_entries; i++) { + struct intel_pmt_entry *entry = &priv->entry[i]; + struct pci_dev *pdev = to_pci_dev(entry->ep->dev); + struct oobmsm_plat_info *plat_info; + + plat_info = intel_vsec_get_mapping(pdev); + if (!IS_ERR(plat_info)) + return plat_info->package_id; + } + + return -ENODEV; +} + static void pmt_telem_remove(struct auxiliary_device *auxdev) { struct pmt_telem_priv *priv = auxiliary_get_drvdata(auxdev); + int package_id; int i; mutex_lock(&ep_lock); + package_id = pmt_telem_get_package_id(priv); + /* + * Tell resctrl/AET that virtual mappings for MMIO space in a CPU + * package are about to be torn down. + */ + if (package_id < 0) { + dev_dbg(&auxdev->dev, "Unable to determine package ID for removed device\n"); + } else { + mutex_unlock(&ep_lock); + intel_aet_invalidate(package_id); + mutex_lock(&ep_lock); + } + for (i = 0; i < priv->num_entries; i++) { struct intel_pmt_entry *entry = &priv->entry[i]; -- 2.55.0