Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964883Ab3CSV1b (ORCPT ); Tue, 19 Mar 2013 17:27:31 -0400 Received: from cavan.codon.org.uk ([93.93.128.6]:54457 "EHLO cavan.codon.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932226Ab3CSV13 (ORCPT ); Tue, 19 Mar 2013 17:27:29 -0400 From: Matthew Garrett To: grawity@gmail.com Cc: torvalds@linux-foundation.org, bhelgaas@google.com, seth.forshee@canonical.com, airlied@gmail.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Matthew Garrett Subject: [PATCH] PCI: Use ROM images from firmware only if no other ROM source available Date: Tue, 19 Mar 2013 17:26:57 -0400 Message-Id: <1363728417-32450-1-git-send-email-matthew.garrett@nebula.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <5148D5C8.2000701@gmail.com> References: <5148D5C8.2000701@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-SA-Do-Not-Run: Yes X-SA-Exim-Connect-IP: 2001:470:1f07:1371:618d:193b:f11b:6df9 X-SA-Exim-Mail-From: matthew.garrett@nebula.com X-SA-Exim-Scanned: No (on cavan.codon.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3717 Lines: 112 Mantas Mikulėnas reported that his graphics hardware failed to initialise after commit f9a37be0f02a. The aim of this commit was to ensure that ROM images were available on some Apple systems that don't expose the GPU ROM via any other source. In this case, UEFI appears to have provided a broken ROM image that we were using even though there was a perfectly valid ROM available via other sources. The simplest way to handle this seems to be to just re-order pci_map_rom() and leave any firmare-supplied ROM to last. Signed-off-by: Matthew Garrett Tested-by: Mantas Mikulėnas --- drivers/pci/rom.c | 55 +++++++++++++++++++++++++++++++++++-------------------- 1 file changed, 35 insertions(+), 20 deletions(-) diff --git a/drivers/pci/rom.c b/drivers/pci/rom.c index ab886b7..b41ac77 100644 --- a/drivers/pci/rom.c +++ b/drivers/pci/rom.c @@ -100,6 +100,27 @@ size_t pci_get_rom_size(struct pci_dev *pdev, void __iomem *rom, size_t size) return min((size_t)(image - rom), size); } +static loff_t pci_find_rom(struct pci_dev *pdev, size_t *size) +{ + struct resource *res = &pdev->resource[PCI_ROM_RESOURCE]; + loff_t start; + + /* assign the ROM an address if it doesn't have one */ + if (res->parent == NULL && pci_assign_resource(pdev, PCI_ROM_RESOURCE)) + return 0; + start = pci_resource_start(pdev, PCI_ROM_RESOURCE); + *size = pci_resource_len(pdev, PCI_ROM_RESOURCE); + + if (*size == 0) + return 0; + + /* Enable ROM space decodes */ + if (pci_enable_rom(pdev)) + return 0; + + return start; +} + /** * pci_map_rom - map a PCI ROM to kernel space * @pdev: pointer to pci device struct @@ -114,21 +135,15 @@ size_t pci_get_rom_size(struct pci_dev *pdev, void __iomem *rom, size_t size) void __iomem *pci_map_rom(struct pci_dev *pdev, size_t *size) { struct resource *res = &pdev->resource[PCI_ROM_RESOURCE]; - loff_t start; + loff_t start = 0; void __iomem *rom; /* - * Some devices may provide ROMs via a source other than the BAR - */ - if (pdev->rom && pdev->romlen) { - *size = pdev->romlen; - return phys_to_virt(pdev->rom); - /* * IORESOURCE_ROM_SHADOW set on x86, x86_64 and IA64 supports legacy * memory map if the VGA enable bit of the Bridge Control register is * set for embedded VGA. */ - } else if (res->flags & IORESOURCE_ROM_SHADOW) { + if (res->flags & IORESOURCE_ROM_SHADOW) { /* primary video rom always starts here */ start = (loff_t)0xC0000; *size = 0x20000; /* cover C000:0 through E000:0 */ @@ -139,21 +154,21 @@ void __iomem *pci_map_rom(struct pci_dev *pdev, size_t *size) return (void __iomem *)(unsigned long) pci_resource_start(pdev, PCI_ROM_RESOURCE); } else { - /* assign the ROM an address if it doesn't have one */ - if (res->parent == NULL && - pci_assign_resource(pdev,PCI_ROM_RESOURCE)) - return NULL; - start = pci_resource_start(pdev, PCI_ROM_RESOURCE); - *size = pci_resource_len(pdev, PCI_ROM_RESOURCE); - if (*size == 0) - return NULL; - - /* Enable ROM space decodes */ - if (pci_enable_rom(pdev)) - return NULL; + start = pci_find_rom(pdev, size); } } + /* + * Some devices may provide ROMs via a source other than the BAR + */ + if (!start && pdev->rom && pdev->romlen) { + *size = pdev->romlen; + return phys_to_virt(pdev->rom); + } + + if (!start) + return NULL; + rom = ioremap(start, *size); if (!rom) { /* restore enable if ioremap fails */ -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/