linux-kernel - Re: [BUG] agpgart-amd64 not initialized in 2.6.33-rc5 if iommu=allowed in kernel command line

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Date:	Tue, 2 Feb 2010 20:23:40 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	mitov@...p.bas.bg
Cc:	fujita.tomonori@....ntt.co.jp, linux-kernel@...r.kernel.org,
	mingo@...e.hu, davej@...hat.com
Subject: Re: [BUG] agpgart-amd64 not initialized in 2.6.33-rc5 if
 iommu=allowed in kernel command line

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@...p.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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