From mboxrd@z Thu Jan 1 00:00:00 1970 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 48343C77B75 for ; Mon, 8 May 2023 10:31:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234764AbjEHKbj (ORCPT ); Mon, 8 May 2023 06:31:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32810 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234670AbjEHKbQ (ORCPT ); Mon, 8 May 2023 06:31:16 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5A2DE24AB6 for ; Mon, 8 May 2023 03:31:06 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id A27DA626C5 for ; Mon, 8 May 2023 10:31:05 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9609DC433D2; Mon, 8 May 2023 10:31:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1683541865; bh=QQaltyppbFcyatwd/zA0bi8NWu3UkPKo5Ecr4Q+46vU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=d+DcYPJngnU/iuGNUKJ8MLVpxdAaP2tO1Qub2zC0RQPAXVvOuZNyKhZmY8sEIuspF KEz7j+7HsO9dU36Zy95l2odpj3kZ/fRI++XtiilgtlnXPEDBye6C9Pc1TMOmXbc44y zMoFlGlPJroMNVfKFgwiYPE+lkiF6c+wqiQHGmEQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sanket Goswami , Shyam Sundar S K , Hans de Goede , Sasha Levin Subject: [PATCH 6.2 252/663] platform/x86/amd: pmc: Move out of BIOS SMN pair for STB init Date: Mon, 8 May 2023 11:41:18 +0200 Message-Id: <20230508094436.440013198@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230508094428.384831245@linuxfoundation.org> References: <20230508094428.384831245@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Shyam Sundar S K [ Upstream commit 8d99129eef8f42377b41c1bacee9f8ce806e9f44 ] The current SMN index used for the driver probe seems to be meant for the BIOS pair and there are potential concurrency problems that can occur with an inopportune SMI. It is been advised to use SMN_INDEX_0 instead of SMN_INDEX_6, which is what amd_nb.c provides and this function has protections to ensure that only one caller can use it at a time. Fixes: 426c0ff27b83 ("platform/x86: amd-pmc: Add support for AMD Smart Trace Buffer") Co-developed-by: Sanket Goswami Signed-off-by: Sanket Goswami Signed-off-by: Shyam Sundar S K Link: https://lore.kernel.org/r/20230409185348.556161-7-Shyam-sundar.S-k@amd.com Reviewed-by: Hans de Goede Signed-off-by: Hans de Goede Signed-off-by: Sasha Levin --- drivers/platform/x86/amd/pmc.c | 26 ++++---------------------- 1 file changed, 4 insertions(+), 22 deletions(-) diff --git a/drivers/platform/x86/amd/pmc.c b/drivers/platform/x86/amd/pmc.c index f8ef1fa742718..45b0050dfbf7b 100644 --- a/drivers/platform/x86/amd/pmc.c +++ b/drivers/platform/x86/amd/pmc.c @@ -38,8 +38,6 @@ #define AMD_PMC_SCRATCH_REG_YC 0xD14 /* STB Registers */ -#define AMD_PMC_STB_INDEX_ADDRESS 0xF8 -#define AMD_PMC_STB_INDEX_DATA 0xFC #define AMD_PMC_STB_PMI_0 0x03E30600 #define AMD_PMC_STB_S2IDLE_PREPARE 0xC6000001 #define AMD_PMC_STB_S2IDLE_RESTORE 0xC6000002 @@ -901,17 +899,9 @@ static int amd_pmc_write_stb(struct amd_pmc_dev *dev, u32 data) { int err; - err = pci_write_config_dword(dev->rdev, AMD_PMC_STB_INDEX_ADDRESS, AMD_PMC_STB_PMI_0); + err = amd_smn_write(0, AMD_PMC_STB_PMI_0, data); if (err) { - dev_err(dev->dev, "failed to write addr in stb: 0x%X\n", - AMD_PMC_STB_INDEX_ADDRESS); - return pcibios_err_to_errno(err); - } - - err = pci_write_config_dword(dev->rdev, AMD_PMC_STB_INDEX_DATA, data); - if (err) { - dev_err(dev->dev, "failed to write data in stb: 0x%X\n", - AMD_PMC_STB_INDEX_DATA); + dev_err(dev->dev, "failed to write data in stb: 0x%X\n", AMD_PMC_STB_PMI_0); return pcibios_err_to_errno(err); } @@ -923,18 +913,10 @@ static int amd_pmc_read_stb(struct amd_pmc_dev *dev, u32 *buf) { int i, err; - err = pci_write_config_dword(dev->rdev, AMD_PMC_STB_INDEX_ADDRESS, AMD_PMC_STB_PMI_0); - if (err) { - dev_err(dev->dev, "error writing addr to stb: 0x%X\n", - AMD_PMC_STB_INDEX_ADDRESS); - return pcibios_err_to_errno(err); - } - for (i = 0; i < FIFO_SIZE; i++) { - err = pci_read_config_dword(dev->rdev, AMD_PMC_STB_INDEX_DATA, buf++); + err = amd_smn_read(0, AMD_PMC_STB_PMI_0, buf++); if (err) { - dev_err(dev->dev, "error reading data from stb: 0x%X\n", - AMD_PMC_STB_INDEX_DATA); + dev_err(dev->dev, "error reading data from stb: 0x%X\n", AMD_PMC_STB_PMI_0); return pcibios_err_to_errno(err); } } -- 2.39.2