From patchwork Thu Mar 3 16:55:11 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bjorn Helgaas X-Patchwork-Id: 8494441 Return-Path: X-Original-To: patchwork-dri-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 7C3FE9F2F0 for ; Thu, 3 Mar 2016 16:55:21 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id AC8CC20351 for ; Thu, 3 Mar 2016 16:55:20 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 25A882038A for ; Thu, 3 Mar 2016 16:55:18 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 80C2C6EAD0; Thu, 3 Mar 2016 16:55:16 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by gabe.freedesktop.org (Postfix) with ESMTPS id 287C76EACE; Thu, 3 Mar 2016 16:55:14 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 3221020364; Thu, 3 Mar 2016 16:55:13 +0000 (UTC) Received: from localhost (173-27-161-33.client.mchsi.com [173.27.161.33]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5B1BE2038F; Thu, 3 Mar 2016 16:55:12 +0000 (UTC) Subject: [PATCH v1 10/12] MIPS: Loongson 3: Keep CPU physical (not virtual) addresses in shadow ROM resource To: linux-pci@vger.kernel.org From: Bjorn Helgaas Date: Thu, 03 Mar 2016 10:55:11 -0600 Message-ID: <20160303165511.3025.17928.stgit@bhelgaas-glaptop2.roam.corp.google.com> In-Reply-To: <20160303164533.3025.82439.stgit@bhelgaas-glaptop2.roam.corp.google.com> References: <20160303164533.3025.82439.stgit@bhelgaas-glaptop2.roam.corp.google.com> User-Agent: StGit/0.16 MIME-Version: 1.0 X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Cc: Matthew Garrett , Tony Luck , Fenghua Yu , Intel Graphics Development , linux-kernel@vger.kernel.org, DRI , Andy Lutomirski , Bruno =?utf-8?q?Pr=C3=A9mont?= , Ralf Baechle , Linus Torvalds X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP Loongson 3 used the IORESOURCE_ROM_COPY flag for its ROM resource. There are two problems with this: - When IORESOURCE_ROM_COPY is set, pci_map_rom() assumes the resource contains virtual addresses, so it doesn't ioremap the resource. This implies loongson_sysconf.vgabios_addr is a virtual address. That's a problem because resources should contain CPU *physical* addresses not virtual addresses. - When IORESOURCE_ROM_COPY is set, pci_cleanup_rom() calls kfree() on the resource. We did not kmalloc() the loongson_sysconf.vgabios_addr area, so it is incorrect to kfree() it. If we're using a shadow copy in RAM for the Loongson 3 VGA BIOS area, disable the ROM BAR and release the address space it was consuming. Use IORESOURCE_ROM_SHADOW instead of IORESOURCE_ROM_COPY. This means the struct resource contains CPU physical addresses, and pci_map_rom() will ioremap() it as needed. Signed-off-by: Bjorn Helgaas --- arch/mips/pci/fixup-loongson3.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/mips/pci/fixup-loongson3.c b/arch/mips/pci/fixup-loongson3.c index b66b1eb..c015ca1 100644 --- a/arch/mips/pci/fixup-loongson3.c +++ b/arch/mips/pci/fixup-loongson3.c @@ -48,9 +48,14 @@ static void pci_fixup_radeon(struct pci_dev *pdev) if (!loongson_sysconf.vgabios_addr) return; - res->start = loongson_sysconf.vgabios_addr; + pci_disable_rom(pdev); + if (res->parent) + release_resource(res); + + res->start = virt_to_phys(loongson_sysconf.vgabios_addr); res->end = res->start + 256*1024 - 1; - res->flags |= IORESOURCE_ROM_COPY; + res->flags = IORESOURCE_MEM | IORESOURCE_ROM_SHADOW | + IORESOURCE_PCI_FIXED; dev_info(&pdev->dev, "BAR %d: assigned %pR for Radeon ROM\n", PCI_ROM_RESOURCE, res);