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    Subject[PATCH v1 31/47] video: fbdev: s3fb: use arch_phys_wc_add() and pci_iomap_wc()
    Date
    From: "Luis R. Rodriguez" <mcgrof@suse.com>

    This driver uses the same area for MTRR as for the ioremap().
    Convert the driver from using the x86 specific MTRR code to
    the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
    will avoid MTRR if write-combining is available, in order to
    take advantage of that also ensure the ioremap'd area is requested
    as write-combining.

    There are a few motivations for this:

    a) Take advantage of PAT when available

    b) Help bury MTRR code away, MTRR is architecture specific and on
    x86 its replaced by PAT

    c) Help with the goal of eventually using _PAGE_CACHE_UC over
    _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

    The conversion done is expressed by the following Coccinelle
    SmPL patch, it additionally required manual intervention to
    address all the #ifdery and removal of redundant things which
    arch_phys_wc_add() already addresses such as verbose message
    about when MTRR fails and doing nothing when we didn't get
    an MTRR.

    @ mtrr_found @
    expression index, base, size;
    @@

    -index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
    +index = arch_phys_wc_add(base, size);

    @ mtrr_rm depends on mtrr_found @
    expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
    @@

    -mtrr_del(index, base, size);
    +arch_phys_wc_del(index);

    @ mtrr_rm_zero_arg depends on mtrr_found @
    expression mtrr_found.index;
    @@

    -mtrr_del(index, 0, 0);
    +arch_phys_wc_del(index);

    @ mtrr_rm_fb_info depends on mtrr_found @
    struct fb_info *info;
    expression mtrr_found.index;
    @@

    -mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
    +arch_phys_wc_del(index);

    @ ioremap_replace_nocache depends on mtrr_found @
    struct fb_info *info;
    expression base, size;
    @@

    -info->screen_base = ioremap_nocache(base, size);
    +info->screen_base = ioremap_wc(base, size);

    @ ioremap_replace_default depends on mtrr_found @
    struct fb_info *info;
    expression base, size;
    @@

    -info->screen_base = ioremap(base, size);
    +info->screen_base = ioremap_wc(base, size);

    Generated-by: Coccinelle SmPL
    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/video/fbdev/s3fb.c | 35 ++++++-----------------------------
    1 file changed, 6 insertions(+), 29 deletions(-)

    diff --git a/drivers/video/fbdev/s3fb.c b/drivers/video/fbdev/s3fb.c
    index f0ae61a..13b1090 100644
    --- a/drivers/video/fbdev/s3fb.c
    +++ b/drivers/video/fbdev/s3fb.c
    @@ -28,13 +28,9 @@
    #include <linux/i2c.h>
    #include <linux/i2c-algo-bit.h>

    -#ifdef CONFIG_MTRR
    -#include <asm/mtrr.h>
    -#endif
    -
    struct s3fb_info {
    int chip, rev, mclk_freq;
    - int mtrr_reg;
    + int wc_cookie;
    struct vgastate state;
    struct mutex open_lock;
    unsigned int ref_count;
    @@ -154,11 +150,7 @@ static const struct svga_timing_regs s3_timing_regs = {


    static char *mode_option;
    -
    -#ifdef CONFIG_MTRR
    static int mtrr = 1;
    -#endif
    -
    static int fasttext = 1;


    @@ -170,11 +162,8 @@ module_param(mode_option, charp, 0444);
    MODULE_PARM_DESC(mode_option, "Default video mode ('640x480-8@60', etc)");
    module_param_named(mode, mode_option, charp, 0444);
    MODULE_PARM_DESC(mode, "Default video mode ('640x480-8@60', etc) (deprecated)");
    -
    -#ifdef CONFIG_MTRR
    module_param(mtrr, int, 0444);
    MODULE_PARM_DESC(mtrr, "Enable write-combining with MTRR (1=enable, 0=disable, default=1)");
    -#endif

    module_param(fasttext, int, 0644);
    MODULE_PARM_DESC(fasttext, "Enable S3 fast text mode (1=enable, 0=disable, default=1)");
    @@ -1168,7 +1157,7 @@ static int s3_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
    info->fix.smem_len = pci_resource_len(dev, 0);

    /* Map physical IO memory address into kernel space */
    - info->screen_base = pci_iomap(dev, 0, 0);
    + info->screen_base = pci_iomap_wc(dev, 0, 0);
    if (! info->screen_base) {
    rc = -ENOMEM;
    dev_err(info->device, "iomap for framebuffer failed\n");
    @@ -1365,12 +1354,9 @@ static int s3_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
    /* Record a reference to the driver data */
    pci_set_drvdata(dev, info);

    -#ifdef CONFIG_MTRR
    - if (mtrr) {
    - par->mtrr_reg = -1;
    - par->mtrr_reg = mtrr_add(info->fix.smem_start, info->fix.smem_len, MTRR_TYPE_WRCOMB, 1);
    - }
    -#endif
    + if (mtrr)
    + par->wc_cookie = arch_phys_wc_add(info->fix.smem_start,
    + info->fix.smem_len);

    return 0;

    @@ -1405,14 +1391,7 @@ static void s3_pci_remove(struct pci_dev *dev)

    if (info) {
    par = info->par;
    -
    -#ifdef CONFIG_MTRR
    - if (par->mtrr_reg >= 0) {
    - mtrr_del(par->mtrr_reg, 0, 0);
    - par->mtrr_reg = -1;
    - }
    -#endif
    -
    + arch_phys_wc_del(par->wc_cookie);
    unregister_framebuffer(info);
    fb_dealloc_cmap(&info->cmap);

    @@ -1551,10 +1530,8 @@ static int __init s3fb_setup(char *options)

    if (!*opt)
    continue;
    -#ifdef CONFIG_MTRR
    else if (!strncmp(opt, "mtrr:", 5))
    mtrr = simple_strtoul(opt + 5, NULL, 0);
    -#endif
    else if (!strncmp(opt, "fasttext:", 9))
    fasttext = simple_strtoul(opt + 9, NULL, 0);
    else
    --
    2.3.2.209.gd67f9d5.dirty


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