lkml.org 
[lkml]   [2015]   [Mar]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH v1 04/47] pci: add pci_ioremap_wc_bar()
    Date
    From: "Luis R. Rodriguez" <mcgrof@suse.com>

    This lets drivers take advanate 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)

    Cc: Suresh Siddha <suresh.b.siddha@intel.com>
    Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Juergen Gross <jgross@suse.com>
    Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
    Cc: Andy Lutomirski <luto@amacapital.net>
    Cc: Dave Airlie <airlied@redhat.com>
    Cc: Antonino Daplas <adaplas@gmail.com>
    Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
    Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
    Cc: linux-fbdev@vger.kernel.org
    Cc: linux-kernel@vger.kernel.org
    Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com>
    ---
    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 81f06e8..6afd507 100644
    --- a/drivers/pci/pci.c
    +++ b/drivers/pci/pci.c
    @@ -137,6 +137,20 @@ void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar)
    pci_resource_len(pdev, bar));
    }
    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 211e9da..c235b09 100644
    --- a/include/linux/pci.h
    +++ b/include/linux/pci.h
    @@ -1667,6 +1667,7 @@ 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_enable_sriov(struct pci_dev *dev, int nr_virtfn);
    --
    2.3.2.209.gd67f9d5.dirty


    \
     
     \ /
      Last update: 2015-03-21 00:41    [W:4.593 / U:0.084 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site