From owner-svn-src-stable-11@freebsd.org Wed Oct 19 02:20:49 2016 Return-Path: Delivered-To: svn-src-stable-11@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id E2E48C17D3D; Wed, 19 Oct 2016 02:20:49 +0000 (UTC) (envelope-from sephe@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id B199D114; Wed, 19 Oct 2016 02:20:49 +0000 (UTC) (envelope-from sephe@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id u9J2KmPf001546; Wed, 19 Oct 2016 02:20:48 GMT (envelope-from sephe@FreeBSD.org) Received: (from sephe@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id u9J2KmZ0001545; Wed, 19 Oct 2016 02:20:48 GMT (envelope-from sephe@FreeBSD.org) Message-Id: <201610190220.u9J2KmZ0001545@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: sephe set sender to sephe@FreeBSD.org using -f From: Sepherosa Ziehau Date: Wed, 19 Oct 2016 02:20:48 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r307597 - stable/11/sys/dev/pci X-SVN-Group: stable-11 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable-11@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: SVN commit messages for only the 11-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Oct 2016 02:20:50 -0000 Author: sephe Date: Wed Oct 19 02:20:48 2016 New Revision: 307597 URL: https://svnweb.freebsd.org/changeset/base/307597 Log: MFC 306359 pci: Clear the MEM/PORT_EN bit when updating PCI BAR It's unsafe to update the BAR when the related EN bit is set. Submitted by: Dexuan Cui Reviewed by: jhb Sponsored by: Microsoft Differential Revision: https://reviews.freebsd.org/D7914 Modified: stable/11/sys/dev/pci/pci.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/dev/pci/pci.c ============================================================================== --- stable/11/sys/dev/pci/pci.c Wed Oct 19 02:15:41 2016 (r307596) +++ stable/11/sys/dev/pci/pci.c Wed Oct 19 02:20:48 2016 (r307597) @@ -4999,6 +4999,7 @@ pci_reserve_map(device_t dev, device_t c struct resource_list *rl = &dinfo->resources; struct resource *res; struct pci_map *pm; + uint16_t cmd; pci_addr_t map, testval; int mapsize; @@ -5088,8 +5089,17 @@ pci_reserve_map(device_t dev, device_t c device_printf(child, "Lazy allocation of %#jx bytes rid %#x type %d at %#jx\n", count, *rid, type, rman_get_start(res)); + + /* Disable decoding via the CMD register before updating the BAR */ + cmd = pci_read_config(child, PCIR_COMMAND, 2); + pci_write_config(child, PCIR_COMMAND, + cmd & ~(PCI_BAR_MEM(map) ? PCIM_CMD_MEMEN : PCIM_CMD_PORTEN), 2); + map = rman_get_start(res); pci_write_bar(child, pm, map); + + /* Restore the original value of the CMD register */ + pci_write_config(child, PCIR_COMMAND, cmd, 2); out: return (res); }