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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 EF232C76188 for ; Fri, 19 Jul 2019 04:14:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C8A2E218B6 for ; Fri, 19 Jul 2019 04:14:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563509663; bh=p0zBARAMRGsB7iLA/OPS80em/wFhjQRa+VklgXTSAXY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=IVFBA3HrLmu1AbA3f8zmDCw6Vf1YhRkQpibArLP9BNID8Tv0kmXSxXf1EoIttDzmm thJalleoJH4sToGsZi5a7ub0qWRO7IVLrDP86WkFojjwkuHkEnntUPc4IfO+MVBkGW E1O3Bo0uai8nzlzz6qGQ+EB483eQE61vY+F4nSss= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388854AbfGSEOW (ORCPT ); Fri, 19 Jul 2019 00:14:22 -0400 Received: from mail.kernel.org ([198.145.29.99]:50314 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389593AbfGSEOO (ORCPT ); Fri, 19 Jul 2019 00:14:14 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 64B1C2189E; Fri, 19 Jul 2019 04:14:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563509653; bh=p0zBARAMRGsB7iLA/OPS80em/wFhjQRa+VklgXTSAXY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=c66W+CH2alX0wSY1LPbpU+brfsdM0BRJ9bw1hebwIbELAGInjWjY8dncjEzeqKozr Y5RXLNpUiOH9BAeOdbxJaBP/SHKAaMC71kFdznpBMVXSiR5yKHr6g9OiZhFq0VXXSX CZNM56TDRXFQJuiySdISY+eZS7I2vdszYJp39Q1o= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Oliver O'Halloran , Sachin Sant , Michael Ellerman , Sasha Levin , linuxppc-dev@lists.ozlabs.org Subject: [PATCH AUTOSEL 4.9 40/45] powerpc/eeh: Handle hugepages in ioremap space Date: Fri, 19 Jul 2019 00:12:59 -0400 Message-Id: <20190719041304.18849-40-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190719041304.18849-1-sashal@kernel.org> References: <20190719041304.18849-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Oliver O'Halloran [ Upstream commit 33439620680be5225c1b8806579a291e0d761ca0 ] In commit 4a7b06c157a2 ("powerpc/eeh: Handle hugepages in ioremap space") support for using hugepages in the vmalloc and ioremap areas was enabled for radix. Unfortunately this broke EEH MMIO error checking. Detection works by inserting a hook which checks the results of the ioreadXX() set of functions. When a read returns a 0xFFs response we need to check for an error which we do by mapping the (virtual) MMIO address back to a physical address, then mapping physical address to a PCI device via an interval tree. When translating virt -> phys we currently assume the ioremap space is only populated by PAGE_SIZE mappings. If a hugepage mapping is found we emit a WARN_ON(), but otherwise handles the check as though a normal page was found. In pathalogical cases such as copying a buffer containing a lot of 0xFFs from BAR memory this can result in the system not booting because it's too busy printing WARN_ON()s. There's no real reason to assume huge pages can't be present and we're prefectly capable of handling them, so do that. Fixes: 4a7b06c157a2 ("powerpc/eeh: Handle hugepages in ioremap space") Reported-by: Sachin Sant Signed-off-by: Oliver O'Halloran Tested-by: Sachin Sant Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20190710150517.27114-1-oohall@gmail.com Signed-off-by: Sasha Levin --- arch/powerpc/kernel/eeh.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c index 8336b9016ca9..a7f229e59892 100644 --- a/arch/powerpc/kernel/eeh.c +++ b/arch/powerpc/kernel/eeh.c @@ -362,10 +362,19 @@ static inline unsigned long eeh_token_to_phys(unsigned long token) NULL, &hugepage_shift); if (!ptep) return token; - WARN_ON(hugepage_shift); - pa = pte_pfn(*ptep) << PAGE_SHIFT; - return pa | (token & (PAGE_SIZE-1)); + pa = pte_pfn(*ptep); + + /* On radix we can do hugepage mappings for io, so handle that */ + if (hugepage_shift) { + pa <<= hugepage_shift; + pa |= token & ((1ul << hugepage_shift) - 1); + } else { + pa <<= PAGE_SHIFT; + pa |= token & (PAGE_SIZE - 1); + } + + return pa; } /* -- 2.20.1