linux-kernel - Re: [PATCH 03/11] intel-gtt: Read 64bit for gmar_bus

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Message-ID: <CAPM=9tyZLm+F1Sq3-ycOS7GmedjiU7DR-GQ=4Hj0BzaAxHHYxQ@mail.gmail.com>
Date:	Wed, 23 May 2012 08:21:51 +0100
From:	Dave Airlie <airlied@...il.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	David Airlie <airlied@...ux.ie>,
	Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH 03/11] intel-gtt: Read 64bit for gmar_bus_addr

On Wed, May 23, 2012 at 7:34 AM, Yinghai Lu <yinghai@...nel.org> wrote:
> That bar could be 64bit pref mem.
>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> Cc: David Airlie <airlied@...ux.ie>

Adding Daniel Vetter.

Dave.
> ---
>  drivers/char/agp/intel-gtt.c |   14 ++++++++++----
>  1 files changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
> index 7f025fb..77e150e 100644
> --- a/drivers/char/agp/intel-gtt.c
> +++ b/drivers/char/agp/intel-gtt.c
> @@ -770,16 +770,22 @@ static void i830_write_entry(dma_addr_t addr, unsigned int entry,
>  static bool intel_enable_gtt(void)
>  {
>        u32 gma_addr;
> +       u32 addr_hi = 0;
>        u8 __iomem *reg;
> +       int pos;
>
>        if (INTEL_GTT_GEN <= 2)
> -               pci_read_config_dword(intel_private.pcidev, I810_GMADDR,
> -                                     &gma_addr);
> +               pos = I810_GMADDR;
>        else
> -               pci_read_config_dword(intel_private.pcidev, I915_GMADDR,
> -                                     &gma_addr);
> +               pos = I915_GMADDR;
> +
> +       pci_read_config_dword(intel_private.pcidev, pos, &gma_addr);
> +
> +       if (gma_addr & PCI_BASE_ADDRESS_MEM_TYPE_64)
> +               pci_read_config_dword(intel_private.pcidev, pos + 4, &addr_hi);
>
>        intel_private.gma_bus_addr = (gma_addr & PCI_BASE_ADDRESS_MEM_MASK);
> +       intel_private.gma_bus_addr |= (u64)addr_hi << 32;
>
>        if (INTEL_GTT_GEN >= 6)
>            return true;
> --
> 1.7.7
>
> --
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