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 X-Spam-Level: X-Spam-Status: No, score=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 01627C43603 for ; Wed, 5 May 2021 17:01:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D7059613C4 for ; Wed, 5 May 2021 17:01:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237884AbhEERBh (ORCPT ); Wed, 5 May 2021 13:01:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:60418 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235898AbhEEQw2 (ORCPT ); Wed, 5 May 2021 12:52:28 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 80CA36198D; Wed, 5 May 2021 16:38:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1620232683; bh=gRzggthx6JTCIwcnzZWAnSscO2Y3rFIiR8bM5a/1Ofg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TM8wcqL7HwdsdQQaIVlCsHdg1eKko95h4iE+LjbFGqt4jRLCKHmwqXLxxzKa4sm+P 8ABeMR8w81v/oT0k6guYqmPhfX32VijR/DxQT51HuFw4GgsMuNEWJ9yG0lNQO2Gawx O79fO2gl1u6ueo7X3ivqEKYvuy7mVUfJprxFMb5yqr6yHLx5JS+H4OINyIHhA5jmmC W45EKzg1DC9BrqPb9aqtISSwOKGoCG5L7Q9Ik3UPFOQbcK3dhHaOivDhDlabXLnyQE bA1Flvno6X3AY/RxmM1meTbDJ4GiTiQbEndiy2I91ORCeh1bt4TdqFOyG0/DelmYx5 kvQOxhldyo8Og== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Suravee Suthikulpanit , Tj , Shuah Khan , Alexander Monakov , David Coe , Paul Menzel , Joerg Roedel , Sasha Levin , iommu@lists.linux-foundation.org Subject: [PATCH AUTOSEL 5.10 51/85] iommu/amd: Remove performance counter pre-initialization test Date: Wed, 5 May 2021 12:36:14 -0400 Message-Id: <20210505163648.3462507-51-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210505163648.3462507-1-sashal@kernel.org> References: <20210505163648.3462507-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Suravee Suthikulpanit [ Upstream commit 994d6608efe4a4c8834bdc5014c86f4bc6aceea6 ] In early AMD desktop/mobile platforms (during 2013), when the IOMMU Performance Counter (PMC) support was first introduced in commit 30861ddc9cca ("perf/x86/amd: Add IOMMU Performance Counter resource management"), there was a HW bug where the counters could not be accessed. The result was reading of the counter always return zero. At the time, the suggested workaround was to add a test logic prior to initializing the PMC feature to check if the counters can be programmed and read back the same value. This has been working fine until the more recent desktop/mobile platforms start enabling power gating for the PMC, which prevents access to the counters. This results in the PMC support being disabled unnecesarily. Unfortunatly, there is no documentation of since which generation of hardware the original PMC HW bug was fixed. Although, it was fixed soon after the first introduction of the PMC. Base on this, we assume that the buggy platforms are less likely to be in used, and it should be relatively safe to remove this legacy logic. Link: https://lore.kernel.org/linux-iommu/alpine.LNX.3.20.13.2006030935570.3181@monopod.intra.ispras.ru/ Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=201753 Cc: Tj (Elloe Linux) Cc: Shuah Khan Cc: Alexander Monakov Cc: David Coe Cc: Paul Menzel Signed-off-by: Suravee Suthikulpanit Tested-by: Shuah Khan Link: https://lore.kernel.org/r/20210409085848.3908-3-suravee.suthikulpanit@amd.com Signed-off-by: Joerg Roedel Signed-off-by: Sasha Levin --- drivers/iommu/amd/init.c | 24 +----------------------- 1 file changed, 1 insertion(+), 23 deletions(-) diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c index c842545368fd..50307c2d42c0 100644 --- a/drivers/iommu/amd/init.c +++ b/drivers/iommu/amd/init.c @@ -1717,33 +1717,16 @@ static int __init init_iommu_all(struct acpi_table_header *table) return 0; } -static int iommu_pc_get_set_reg(struct amd_iommu *iommu, u8 bank, u8 cntr, - u8 fxn, u64 *value, bool is_write); - static void init_iommu_perf_ctr(struct amd_iommu *iommu) { + u64 val; struct pci_dev *pdev = iommu->dev; - u64 val = 0xabcd, val2 = 0, save_reg = 0; if (!iommu_feature(iommu, FEATURE_PC)) return; amd_iommu_pc_present = true; - /* save the value to restore, if writable */ - if (iommu_pc_get_set_reg(iommu, 0, 0, 0, &save_reg, false)) - goto pc_false; - - /* Check if the performance counters can be written to */ - if ((iommu_pc_get_set_reg(iommu, 0, 0, 0, &val, true)) || - (iommu_pc_get_set_reg(iommu, 0, 0, 0, &val2, false)) || - (val != val2)) - goto pc_false; - - /* restore */ - if (iommu_pc_get_set_reg(iommu, 0, 0, 0, &save_reg, true)) - goto pc_false; - pci_info(pdev, "IOMMU performance counters supported\n"); val = readl(iommu->mmio_base + MMIO_CNTR_CONF_OFFSET); @@ -1751,11 +1734,6 @@ static void init_iommu_perf_ctr(struct amd_iommu *iommu) iommu->max_counters = (u8) ((val >> 7) & 0xf); return; - -pc_false: - pci_err(pdev, "Unable to read/write to IOMMU perf counter.\n"); - amd_iommu_pc_present = false; - return; } static ssize_t amd_iommu_show_cap(struct device *dev, -- 2.30.2