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Groups > linux.kernel > #1212444

[PATCH v4 04/11] drivers/video/fbdev/gxt4500: Use pci_ioremap_wc_bar() to map framebuffer

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From: "Luis R. Rodriguez" <mcgrof@suse.com>

The driver doesn't use mtrr_add() or arch_phys_wc_add() but since we
know the framebuffer is isolated already on an ioremap() we can take
advantage of write combining for performance where possible.

In this case there are a few motivations for this:

a) Take advantage of PAT when available.

b) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (see commit
   de33c442e titled "x86 PAT: fix performance drop for glx,
   use UC minus for ioremap(), ioremap_nocache() and
   pci_mmap_page_range()").

Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com>
Acked-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: benh@kernel.crashing.org
Cc: bhelgaas@google.com
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-pci@vger.kernel.org
Cc: mst@redhat.com
Cc: Rob Clark <robdclark@gmail.com>
Cc: Suresh Siddha <sbsiddha@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: toshi.kani@hp.com
Link: http://lkml.kernel.org/r/1435195342-26879-5-git-send-email-mcgrof@do-not-panic.com
Signed-off-by: Borislav Petkov <bp@suse.de>
---
 drivers/video/fbdev/gxt4500.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/gxt4500.c b/drivers/video/fbdev/gxt4500.c
index 135d78a02588..f19133a80e8c 100644
--- a/drivers/video/fbdev/gxt4500.c
+++ b/drivers/video/fbdev/gxt4500.c
@@ -662,7 +662,7 @@ static int gxt4500_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	info->fix.smem_start = fb_phys;
 	info->fix.smem_len = pci_resource_len(pdev, 1);
-	info->screen_base = pci_ioremap_bar(pdev, 1);
+	info->screen_base = pci_ioremap_wc_bar(pdev, 1);
 	if (!info->screen_base) {
 		dev_err(&pdev->dev, "gxt4500: cannot map framebuffer\n");
 		goto err_unmap_regs;
-- 
2.4.3

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[PATCH v4 00/11] x86/dma: RIP MTRR and dma write-combine API rename "Luis R. Rodriguez" <mcgrof@do-not-panic.com> - 2015-08-24 21:20 +0200
  [PATCH v4 01/11] PCI: Add pci_ioremap_wc_bar() "Luis R. Rodriguez" <mcgrof@do-not-panic.com> - 2015-08-24 21:20 +0200
    [tip:x86/mm] PCI: Add pci_ioremap_wc_bar() "tip-bot for Luis R. Rodriguez" <tipbot@zytor.com> - 2015-08-25 10:30 +0200
  [PATCH v4 02/11] drivers/video/fbdev/i740fb: Use arch_phys_wc_add() and pci_ioremap_wc_bar() "Luis R. Rodriguez" <mcgrof@do-not-panic.com> - 2015-08-24 21:20 +0200
    [tip:x86/mm] drivers/video/fbdev/i740fb: Use arch_phys_wc_add()   and pci_ioremap_wc_bar() "tip-bot for Luis R. Rodriguez" <tipbot@zytor.com> - 2015-08-25 10:30 +0200
  [PATCH v4 03/11] drivers/video/fbdev/kyrofb: Use arch_phys_wc_add() and pci_ioremap_wc_bar() "Luis R. Rodriguez" <mcgrof@do-not-panic.com> - 2015-08-24 21:30 +0200
    [tip:x86/mm] drivers/video/fbdev/kyrofb: Use arch_phys_wc_add()   and pci_ioremap_wc_bar() "tip-bot for Luis R. Rodriguez" <tipbot@zytor.com> - 2015-08-25 10:30 +0200
  [PATCH v4 05/11] PCI: Add pci_iomap_wc() variants "Luis R. Rodriguez" <mcgrof@do-not-panic.com> - 2015-08-24 21:30 +0200
    [tip:x86/mm] PCI: Add pci_iomap_wc() variants "tip-bot for Luis R. Rodriguez" <tipbot@zytor.com> - 2015-08-25 10:30 +0200
  [PATCH v4 08/11] drivers/video/fbdev/vt8623fb: Use arch_phys_wc_add() and pci_iomap_wc() "Luis R. Rodriguez" <mcgrof@do-not-panic.com> - 2015-08-24 21:30 +0200
    [tip:x86/mm] drivers/video/fbdev/vt8623fb: Use arch_phys_wc_add()   and pci_iomap_wc() "tip-bot for Luis R. Rodriguez" <tipbot@zytor.com> - 2015-08-25 10:30 +0200
  [PATCH v4 11/11] mtrr: bury MTRR - unexport mtrr_add() and mtrr_del() "Luis R. Rodriguez" <mcgrof@do-not-panic.com> - 2015-08-24 21:30 +0200
    [tip:x86/mm] x86/mm/mtrr: Remove kernel internal MTRR interfaces:   unexport mtrr_add() and mtrr_del() "tip-bot for Luis R. Rodriguez" <tipbot@zytor.com> - 2015-08-28 10:20 +0200
  [PATCH v4 09/11] drivers/dma/iop-adma: Use dma_alloc_writecombine() kernel-style "Luis R. Rodriguez" <mcgrof@do-not-panic.com> - 2015-08-24 21:30 +0200
    [tip:x86/mm] drivers/dma/iop-adma: Use dma_alloc_writecombine()   kernel-style "tip-bot for Luis R. Rodriguez" <tipbot@zytor.com> - 2015-08-25 10:30 +0200
  [PATCH v4 04/11] drivers/video/fbdev/gxt4500: Use pci_ioremap_wc_bar() to map framebuffer "Luis R. Rodriguez" <mcgrof@do-not-panic.com> - 2015-08-24 21:30 +0200
    [tip:x86/mm] drivers/video/fbdev/gxt4500: Use pci_ioremap_wc_bar(  ) to map framebuffer "tip-bot for Luis R. Rodriguez" <tipbot@zytor.com> - 2015-08-25 10:30 +0200
  [PATCH v4 07/11] drivers/video/fbdev/s3fb: Use arch_phys_wc_add() and pci_iomap_wc() "Luis R. Rodriguez" <mcgrof@do-not-panic.com> - 2015-08-24 21:30 +0200
    [tip:x86/mm] drivers/video/fbdev/s3fb: Use arch_phys_wc_add()   and pci_iomap_wc() "tip-bot for Luis R. Rodriguez" <tipbot@zytor.com> - 2015-08-25 10:30 +0200
  [PATCH v4 06/11] drivers/video/fbdev/arkfb.c: Use arch_phys_wc_add() and pci_iomap_wc() "Luis R. Rodriguez" <mcgrof@do-not-panic.com> - 2015-08-24 21:30 +0200
    [tip:x86/mm] drivers/video/fbdev/arkfb.c: Use arch_phys_wc_add()   and pci_iomap_wc() "tip-bot for Luis R. Rodriguez" <tipbot@zytor.com> - 2015-08-25 10:30 +0200
  Re: [PATCH v4 10/11] dma: rename dma_*_writecombine() to dma_*_wc() Ingo Molnar <mingo@kernel.org> - 2015-08-25 10:20 +0200
    Re: [PATCH v4 10/11] dma: rename dma_*_writecombine() to dma_*_wc() "Luis R. Rodriguez" <mcgrof@suse.com> - 2015-08-25 17:50 +0200
      Re: [PATCH v4 10/11] dma: rename dma_*_writecombine() to dma_*_wc() Andrew Morton <akpm@linux-foundation.org> - 2015-08-25 22:50 +0200
        Re: [PATCH v4 10/11] dma: rename dma_*_writecombine() to dma_*_wc() "Luis R. Rodriguez" <mcgrof@suse.com> - 2015-08-26 01:20 +0200
          Re: [PATCH v4 10/11] dma: rename dma_*_writecombine() to dma_*_wc() Andrew Morton <akpm@linux-foundation.org> - 2015-08-26 01:30 +0200
            Re: [PATCH v4 10/11] dma: rename dma_*_writecombine() to dma_*_wc() Ingo Molnar <mingo@kernel.org> - 2015-08-26 06:30 +0200

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