From patchwork Tue Aug 30 10:49:13 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "rajvi.jingar" X-Patchwork-Id: 12959093 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 48B36C0502A for ; Tue, 30 Aug 2022 10:49:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229811AbiH3KtT (ORCPT ); Tue, 30 Aug 2022 06:49:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50262 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229775AbiH3KtS (ORCPT ); Tue, 30 Aug 2022 06:49:18 -0400 Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BEDB4DF4C2; Tue, 30 Aug 2022 03:49:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1661856556; x=1693392556; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=TUQ7avMuLxhf37gvjWMg7acpWzikzJL0j5/UqprSQsU=; b=asj4GmMeODMHhG6VJQAf4xzI3RmH/Temr/drCTi9YVraDXsfpENwcKCq JTKkvi+XpqXTJH80gVCtLU11WWCGb3I9tWzX4UhKkmZHpR9R98APbqmJo 3wM0bvAfbbgierXJPl+tb4FXQUHKJJV7hn4ccQB/TCj28IKzN1B1D8XMf KqfxHcXIkikK8hSdA+09prU7HUGpRYMKDKVIvwAFXsfP2behE+jSBAtwC j3sJjnBPHtHd2AWvLdxarfIrNbT8EgV4AFlbfbdCFYas6cUcywo69ACDL DBRcVLdemPKOKnvlYfsX9uLv/QPlLnZYMB199hWQmNGQcKMJaR3UU9R6V A==; X-IronPort-AV: E=McAfee;i="6500,9779,10454"; a="278160876" X-IronPort-AV: E=Sophos;i="5.93,274,1654585200"; d="scan'208";a="278160876" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Aug 2022 03:49:16 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.93,274,1654585200"; d="scan'208";a="607795711" Received: from linux.intel.com ([10.54.29.200]) by orsmga007.jf.intel.com with ESMTP; 30 Aug 2022 03:49:16 -0700 Received: from rjingar-desk5.amr.corp.intel.com (bdsebast-mobl2.amr.corp.intel.com [10.209.149.131]) by linux.intel.com (Postfix) with ESMTP id 0BBCF5808F0; Tue, 30 Aug 2022 03:49:16 -0700 (PDT) From: Rajvi Jingar To: rafael.j.wysocki@intel.com, bhelgaas@google.com Cc: rajvi.jingar@linux.intel.com, david.e.box@linux.intel.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Subject: [RESEND PATCH v3 2/2] PCI/PTM: fix to maintain pci_dev->ptm_enabled Date: Tue, 30 Aug 2022 03:49:13 -0700 Message-Id: <20220830104913.1620539-2-rajvi.jingar@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220830104913.1620539-1-rajvi.jingar@linux.intel.com> References: <20220830104913.1620539-1-rajvi.jingar@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org pci_dev->ptm_enabled needs to be maintained to reflect the current PTM state of the device. In pci_ptm_disable(), clear ptm_enabled from 'struct pci_dev' on disabling PTM state for the device. In pci_restore_ptm_state(), set dev->ptm_enabled based on the restored PTM state of the device. In pci_ptm_disable(), perform ptm_enabled check to avoid config space access in case if PTM is already disabled for the device. ptm_enabled won't be set for non-PCIe devices so pci_is_pcie(dev) check is not needed anymore. Signed-off-by: Rajvi Jingar Reviewed-by: Rafael J. Wysocki --- v1->v2: - add ptm_enabled check in pci_ptm_disable(). - set the dev->ptm_enabled value in pci_restore_ptm_state(). v2->v3: - remove pci_is_pcie(dev) check in pci_ptm_disable(). - add Reviewed-by tag in commit message --- drivers/pci/pcie/ptm.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/pci/pcie/ptm.c b/drivers/pci/pcie/ptm.c index 368a254e3124..1ce241d4538f 100644 --- a/drivers/pci/pcie/ptm.c +++ b/drivers/pci/pcie/ptm.c @@ -34,7 +34,7 @@ void pci_disable_ptm(struct pci_dev *dev) int ptm; u16 ctrl; - if (!pci_is_pcie(dev)) + if (!dev->ptm_enabled) return; ptm = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_PTM); @@ -44,6 +44,7 @@ void pci_disable_ptm(struct pci_dev *dev) pci_read_config_word(dev, ptm + PCI_PTM_CTRL, &ctrl); ctrl &= ~(PCI_PTM_CTRL_ENABLE | PCI_PTM_CTRL_ROOT); pci_write_config_word(dev, ptm + PCI_PTM_CTRL, ctrl); + dev->ptm_enabled = 0; } void pci_save_ptm_state(struct pci_dev *dev) @@ -83,6 +84,7 @@ void pci_restore_ptm_state(struct pci_dev *dev) cap = (u16 *)&save_state->cap.data[0]; pci_write_config_word(dev, ptm + PCI_PTM_CTRL, *cap); + dev->ptm_enabled = !!(*cap & PCI_PTM_CTRL_ENABLE); } void pci_ptm_init(struct pci_dev *dev)