From patchwork Wed May 8 02:41:49 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shawn Anastasio X-Patchwork-Id: 10934127 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6FB02112C for ; Wed, 8 May 2019 02:51:12 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 60F03289A2 for ; Wed, 8 May 2019 02:51:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 54F4B289A6; Wed, 8 May 2019 02:51:12 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 00A38289A2 for ; Wed, 8 May 2019 02:51:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726700AbfEHCvB (ORCPT ); Tue, 7 May 2019 22:51:01 -0400 Received: from alpha.anastas.io ([104.248.188.109]:45161 "EHLO alpha.anastas.io" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726406AbfEHCvB (ORCPT ); Tue, 7 May 2019 22:51:01 -0400 Received: from authenticated-user (alpha.anastas.io [104.248.188.109]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alpha.anastas.io (Postfix) with ESMTPSA id B77C17F8E4; Tue, 7 May 2019 21:41:55 -0500 (CDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=anastas.io; s=mail; t=1557283316; bh=nf95epbdL+CZevupMmf9m+9w2BZaXHsLR33tgT+SYxc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OF63QBueAqOwtfAoiXSBbjeG7B5TmhwbsNMnKCj1TKUYXr7GJV23+H9/Yb0/4aGUm pqWHa214o+SHJ9Wc9tp2zvAicAqM3LsBHOxpurwQmpwi5RQO3Zq2Iq28yX+58uf3Oo V4BOLqUQ4+bPfhRZ7MD5M5C0/xmxBCDmdNsF6N6DtmLNDwWhgJW2MNz5tMB3bjwRfJ inJ7Kfn8bsfU2pFx+l7F0Dj6BxG/95XTNed/b2GCD06Lt7ffhFdlb1ZtTiu/OKY7K6 ZGClKHNy0w0krc5h/eu0iHygkCfo1kzyouvMEwSLqocIL3jTz6a25c1hmN+7+35W0t 1RvK3UPtB7GVA== From: Shawn Anastasio To: bhelgaas@google.com Cc: benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au, sbobroff@linux.ibm.com, xyjxie@linux.vnet.ibm.com, rppt@linux.ibm.com, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: [PATCH 1/3] PCI: Introduce pcibios_ignore_alignment_request Date: Tue, 7 May 2019 21:41:49 -0500 Message-Id: <20190508024151.5690-2-shawn@anastas.io> In-Reply-To: <20190508024151.5690-1-shawn@anastas.io> References: <20190508024151.5690-1-shawn@anastas.io> MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Introduce a new pcibios function pcibios_ignore_alignment_request which allows the PCI core to defer to platform-specific code to determine whether or not to ignore alignment requests for PCI resources. The existing behavior is to simply ignore alignment requests when PCI_PROBE_ONLY is set. This is behavior is maintained by the default implementation of pcibios_ignore_alignment_request. Signed-off-by: Shawn Anastasio --- drivers/pci/pci.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 766f5779db92..e7a925f2188e 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -5896,6 +5896,11 @@ resource_size_t __weak pcibios_default_alignment(void) return 0; } +int __weak pcibios_ignore_alignment_request(void) +{ + return pci_has_flag(PCI_PROBE_ONLY); +} + #define RESOURCE_ALIGNMENT_PARAM_SIZE COMMAND_LINE_SIZE static char resource_alignment_param[RESOURCE_ALIGNMENT_PARAM_SIZE] = {0}; static DEFINE_SPINLOCK(resource_alignment_lock); @@ -5920,9 +5925,9 @@ static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev, p = resource_alignment_param; if (!*p && !align) goto out; - if (pci_has_flag(PCI_PROBE_ONLY)) { + if (pcibios_ignore_alignment_request()) { align = 0; - pr_info_once("PCI: Ignoring requested alignments (PCI_PROBE_ONLY)\n"); + pr_info_once("PCI: Ignoring requested alignments\n"); goto out; }