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x86, AMD IOMMU: disable suspend/resume with IOMMU enabled (for now)

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This patch disables suspend/resume on machines with AMD IOMMU enabled. Real
suspend/resume support for AMD IOMMU is currently being worked on. Until this
is ready it will be disabled to avoid data corruption when the IOMMU is not
properly re-enabled at resume. The patch is based on a similar patch for the
GART driver written by Pavel Machek.

The overall driver merged into tip/master is tested with parallel disk and
network loads and showed no problems in a test running for 3 days.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Cc: iommu@lists.linux-foundation.org
Cc: bhavna.sarathy@amd.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Joerg Roedel 2008-06-30 20:18:02 +02:00 committed by Ingo Molnar
parent 07c40e8a1a
commit 7441e9cb18
1 changed files with 35 additions and 0 deletions
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35
arch/x86/kernel/amd_iommu_init.c
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@ -21,6 +21,7 @@
#include <linux/acpi.h>
#include <linux/gfp.h>
#include <linux/list.h>
#include <linux/sysdev.h>
#include <asm/pci-direct.h>
#include <asm/amd_iommu_types.h>
#include <asm/amd_iommu.h>
@ -654,6 +655,32 @@ static void __init enable_iommus(void)
}
}
/*
* Suspend/Resume support
* disable suspend until real resume implemented
*/
static int amd_iommu_resume(struct sys_device *dev)
{
return 0;
}
static int amd_iommu_suspend(struct sys_device *dev, pm_message_t state)
{
return -EINVAL;
}
static struct sysdev_class amd_iommu_sysdev_class = {
.name = "amd_iommu",
.suspend = amd_iommu_suspend,
.resume = amd_iommu_resume,
};
static struct sys_device device_amd_iommu = {
.id = 0,
.cls = &amd_iommu_sysdev_class,
};
int __init amd_iommu_init(void)
{
int i, ret = 0;
@ -745,6 +772,14 @@ int __init amd_iommu_init(void)
if (ret)
goto free;
ret = sysdev_class_register(&amd_iommu_sysdev_class);
if (ret)
goto free;
ret = sysdev_register(&device_amd_iommu);
if (ret)
goto free;
enable_iommus();
printk(KERN_INFO "AMD IOMMU: aperture size is %d MB\n",