lkml.org 
[lkml]   [2008]   [Oct]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [git pull] drm patches for 2.6.27-rc1

    * Keith Packard <keithp@keithp.com> wrote:

    > On Sun, 2008-10-19 at 00:32 +0200, Ingo Molnar wrote:
    >
    > > the _real_ remapping in a graphics aperture happens on the GPU level
    > > anyway, you manage an in-RAM GPU pagetable that just works like an
    > > IOMMU, correct?
    >
    > Yes, a one-level linear MMU which uses BIOS-reserved memory.
    >
    > So, at least for a prototype, on 64-bit we can just use ioremap_wc and
    > hold the mapping while the driver is open? Is there any huge benefit
    > to using the kernel mapping?

    correct. There's no benefit to using the kernel mapping - and we can add
    2MB pages support to ioremap just fine and then you'll benefit from it
    automatically.

    Ingo


    \
     
     \ /
      Last update: 2008-10-20 12:05    [W:4.178 / U:0.012 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site