Some questions about xf86-video-intel driver

[Eric Anholt]

On Tue, 2007-10-23 at 09:47 +0200, Simon Pasch wrote:
> Eric Anholt wrote:
> > If you want to decrease the amount of memory allocated in AGP, you'll
> > need to reduce the size of the allocations the X Server does.  We try to
> > choose reasonable allocations by default, and you can see what exactly
> > we do in the "Memory Allocation Layout" printout in Xorg.0.log.
> > 
> 
> Alright. So I hard-coded the pI830->FbMapSize-Value to 32MB.
> Is this solution acceptable? Or could I get into problems with that?

So, by limiting your aperture size, you've killed your ability to do 3d,
and I think XV as well from the snippet of log.  If you're set on
reducing the memory allocations, you should actually look into the
allocations and see where you can trim space while keeping the driver
usable (yes, this will require understanding what each allocation is
used for and whether reducing it will have acceptable negative effects
for your), instead of just reducing the aperture size to make feature
setup fail entirely.

> --- i830_driver.c.old	2007-10-23 09:29:17.000000000 +0200
> +++ i830_driver.c	2007-10-23 09:29:34.000000000 +0200
> @@ -1218,8 +1218,7 @@
>         }
>      } else {
>         if (IS_I9XX(pI830)) {
> -	 pI830->FbMapSize = 1UL << pciGetBaseSize(pI830->PciTag, 2,TRUE,
> -						  NULL);
> +	 pI830->FbMapSize = 0x2000000;
>         } else {
>   	 /* 128MB aperture for later i8xx series. */
>   	 pI830->FbMapSize = 0x8000000;
> 
> 
> 
> The memory allocation layout looks like that now:
> (II) intel(0): Memory allocation layout:
> (II) intel(0): 0x00000000-0x0001ffff: ring buffer (128 kB)
> (II) intel(0): 0x00020000-0x00029fff: HW cursors (40 kB, 0x 
> 1f820000 physical)
> (II) intel(0): 0x0002a000-0x00031fff: logical 3D context (32 kB)
> (II) intel(0): 0x00032000-0x00032fff: overlay registers (4 kB, 0x 
>   1f832000 physical)
> (II) intel(0): 0x00040000-0x01258fff: front buffer (18532 kB)
> (II) intel(0): 0x007f7000:            end of stolen memory
> (II) intel(0): 0x01259000-0x01268fff: xaa scratch (64 kB)
> (II) intel(0): 0x02000000:            end of aperture
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-- 
Eric Anholt                             anholt at FreeBSD.org
eric at anholt.net                         eric.anholt at intel.com

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