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SubjectRe: [BUG] agpgart-amd64 not initialized in 2.6.33-rc5 if iommu=allowed in kernel command line
From
Really sorry for taking so long. I had been away from my workplace.

On Mon, 25 Jan 2010 09:37:53 +0200
Marin Mitov <mitov@issp.bas.bg> wrote:

> > Can you test this patch with set CONFIG_AGP_AMD64 to both y and m
> > (also loading/unloading the module twice)?
>
> If CONFIG_AGP_AMD64=y it works (I have agp) both with no kernel command
> line parameters as well as with iommu=allowed in kernel command line.

Good.


> If CONFIG_AGP_AMD64=m it works (I have agp) with no kernel command
> line parameters. If I boot to no graphics (runlevel 3 in slackware),
> lsmod output is:
>
> amd64_agp 7463 1
> agpgart 27765 1 amd64_agp
>
> amd64_agp is in use (not known by who), cannot be unloaded and I cannot
> test load/unload.
>
> If CONFIG_AGP_AMD64=m and iommu=allowed is in kernel command line
> I have no agp.
> dmesg:
> [drm:mga_do_agp_dma_bootstrap] *ERROR* Unable to acquire AGP: -19

This works with 2.6.32, right? The following patch works?

Sorry for inconvenience.

> If I boot to no graphics and try:
> modprobe amd64_agp
> FATAL: Error inserting amd64_agp
> (/lib/modules/2.6.33-rc5/kernel/drivers/char/agp/amd64-agp.ko): No such
> device

diff --git a/drivers/char/agp/amd64-agp.c b/drivers/char/agp/amd64-agp.c
index 34cf04e..8d67923 100644
--- a/drivers/char/agp/amd64-agp.c
+++ b/drivers/char/agp/amd64-agp.c
@@ -768,7 +768,7 @@ int __init agp_amd64_init(void)
static int __init agp_amd64_mod_init(void)
{
if (gart_iommu_aperture)
- return agp_bridges_found ? 0 : -ENODEV;
+ return 0;

return agp_amd64_init();
}

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