From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Luis R. Rodriguez" Subject: [PATCH v9 1/8] PCI: Add pci_ioremap_wc_bar() Date: Wed, 8 Jul 2015 18:54:12 -0700 Message-ID: <1436406859-1280-2-git-send-email-mcgrof@do-not-panic.com> References: <1436406859-1280-1-git-send-email-mcgrof@do-not-panic.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <1436406859-1280-1-git-send-email-mcgrof@do-not-panic.com> Sender: linux-pci-owner@vger.kernel.org To: mingo@kernel.org Cc: bp@suse.de, arnd@arndb.de, bhelgaas@google.com, luto@amacapital.net, akpm@linux-foundation.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, tomi.valkeinen@ti.com, mst@redhat.com, toshi.kani@hp.com, linux-fbdev@vger.kernel.org, xen-devel@lists.xensource.com, benh@kernel.crashing.org, "Luis R. Rodriguez" , Antonino Daplas , Daniel Vetter , Dave Airlie , Davidlohr Bueso , "H. Peter Anvin" , Jean-Christophe Plagniol-Villard , Juergen Gross , Mel Gorman , Suresh Siddha , Thomas Gleixner , =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= , Vlastimil Babka List-Id: xen-devel@lists.xenproject.org =46rom: "Luis R. Rodriguez" This lets drivers take advantage of PAT when available. It 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(), see: de33c442ed2a ("x86 PAT: fix performance drop for glx, use UC minus fo= r ioremap(), ioremap_nocache() and pci_mmap_page_range()") Signed-off-by: Luis R. Rodriguez Acked-by: Arnd Bergmann Cc: Andrew Morton Cc: Andy Lutomirski Cc: Antonino Daplas Cc: benh@kernel.crashing.org Cc: Bjorn Helgaas Cc: Daniel Vetter Cc: Dave Airlie Cc: Davidlohr Bueso Cc: H. Peter Anvin Cc: Ingo Molnar Cc: Jean-Christophe Plagniol-Villard Cc: Juergen Gross Cc: linux-fbdev@vger.kernel.org Cc: linux-pci@vger.kernel.org Cc: Mel Gorman Cc: mst@redhat.com Cc: Suresh Siddha Cc: Thomas Gleixner Cc: Tomi Valkeinen Cc: Toshi Kani Cc: Ville Syrj=C3=A4l=C3=A4 Cc: Vlastimil Babka Link: http://lkml.kernel.org/r/1435195342-26879-2-git-send-email-mcgrof= @do-not-panic.com Signed-off-by: Borislav Petkov --- 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 0008c950452c..fdae37b473f8 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 resourc= e + */ + 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 =20 #define PCI_FIND_CAP_TTL 48 diff --git a/include/linux/pci.h b/include/linux/pci.h index c0dd4ab5c2f5..1193975d20c3 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); =20 void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar); +void __iomem *pci_ioremap_wc_bar(struct pci_dev *pdev, int bar); =20 #ifdef CONFIG_PCI_IOV int pci_iov_virtfn_bus(struct pci_dev *dev, int id); --=20 2.3.2.209.gd67f9d5.dirty