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Commit 736501ee authored by Joerg Roedel's avatar Joerg Roedel
Browse files

amd-iommu: implement suspend/resume 



This patch puts everything together and enables suspend/resume support
in the AMD IOMMU driver.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 05f92db9

arch/x86/kernel/amd_iommu_init.c

+20 −1
Original line number Diff line number Diff line
@@ -965,12 +965,31 @@ static void disable_iommus(void) 


static int amd_iommu_resume(struct sys_device *dev)

{

	/*

	 * Disable IOMMUs before reprogramming the hardware registers.

	 * IOMMU is still enabled from the resume kernel.

	 */

	disable_iommus();



	/* re-load the hardware */

	enable_iommus();



	/*

	 * we have to flush after the IOMMUs are enabled because a

	 * disabled IOMMU will never execute the commands we send

	 */

	amd_iommu_flush_all_domains();

	amd_iommu_flush_all_devices();



	return 0;

}



static int amd_iommu_suspend(struct sys_device *dev, pm_message_t state)

{

	return -EINVAL;

	/* disable IOMMUs to go out of the way for BIOS */

	disable_iommus();



	return 0;

}



static struct sysdev_class amd_iommu_sysdev_class = {