From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: "Luis R. Rodriguez" To: arnd@arndb.de Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, xen-devel@lists.xensource.com, linux-fbdev@vger.kernel.org, "Luis R. Rodriguez" , Toshi Kani , Bjorn Helgaas , Suresh Siddha , Ingo Molnar , Thomas Gleixner , Juergen Gross , Daniel Vetter , Andy Lutomirski , Dave Airlie , Antonino Daplas , Jean-Christophe Plagniol-Villard , Tomi Valkeinen , =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= , Mel Gorman , Vlastimil Babka , Borislav Petkov , Davidlohr Bueso Subject: [PATCH v7 1/9] pci: add pci_ioremap_wc_bar() Date: Fri, 19 Jun 2015 15:08:24 -0700 Message-Id: <1434751712-24333-2-git-send-email-mcgrof@do-not-panic.com> In-Reply-To: <1434751712-24333-1-git-send-email-mcgrof@do-not-panic.com> References: <1434751712-24333-1-git-send-email-mcgrof@do-not-panic.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: From: "Luis R. Rodriguez" This lets drivers take advantage of PAT when available. This should help with the transition of converting video drivers over to ioremap_wc() to help with the goal of eventually using _PAGE_CACHE_UC over _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e titled "x86 PAT: fix performance drop for glx, use UC minus for ioremap(), ioremap_nocache() and pci_mmap_page_range()") Cc: Toshi Kani Cc: Bjorn Helgaas Cc: Suresh Siddha Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Juergen Gross Cc: Daniel Vetter Cc: Andy Lutomirski Cc: Dave Airlie Cc: Antonino Daplas Cc: Jean-Christophe Plagniol-Villard Cc: Tomi Valkeinen Cc: Ville Syrjälä Cc: Mel Gorman Cc: Vlastimil Babka Cc: Borislav Petkov Cc: Davidlohr Bueso Cc: linux-fbdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Luis R. Rodriguez --- drivers/pci/pci.c | 14 ++++++++++++++ include/linux/pci.h | 1 + 2 files changed, 15 insertions(+) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 0008c95..fdae37b 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -138,6 +138,20 @@ void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar) return ioremap_nocache(res->start, resource_size(res)); } EXPORT_SYMBOL_GPL(pci_ioremap_bar); + +void __iomem *pci_ioremap_wc_bar(struct pci_dev *pdev, int bar) +{ + /* + * Make sure the BAR is actually a memory resource, not an IO resource + */ + if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) { + WARN_ON(1); + return NULL; + } + return ioremap_wc(pci_resource_start(pdev, bar), + pci_resource_len(pdev, bar)); +} +EXPORT_SYMBOL_GPL(pci_ioremap_wc_bar); #endif #define PCI_FIND_CAP_TTL 48 diff --git a/include/linux/pci.h b/include/linux/pci.h index c0dd4ab..1193975 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1657,6 +1657,7 @@ static inline void pci_mmcfg_late_init(void) { } int pci_ext_cfg_avail(void); void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar); +void __iomem *pci_ioremap_wc_bar(struct pci_dev *pdev, int bar); #ifdef CONFIG_PCI_IOV int pci_iov_virtfn_bus(struct pci_dev *dev, int id); -- 2.3.2.209.gd67f9d5.dirty -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in Please read the FAQ at http://www.tux.org/lkml/