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Commit 474d567d authored by Joerg Roedel's avatar Joerg Roedel
Browse files

iommu/amd: Don't initialize IOMMUv2 resources when not required 



Add a check to the init-path of the AMD IOMMUv2 driver if
the hardware is available in the system. Only allocate all
the resources if it is really available.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 525b233c

drivers/iommu/amd_iommu_v2.c

+13 −1
Original line number Diff line number Diff line
@@ -921,7 +921,16 @@ static int __init amd_iommu_v2_init(void) 
	size_t state_table_size;

	int ret;



	pr_info("AMD IOMMUv2 driver by Joerg Roedel <joerg.roedel@amd.com>");

	pr_info("AMD IOMMUv2 driver by Joerg Roedel <joerg.roedel@amd.com>\n");



	if (!amd_iommu_v2_supported()) {

		pr_info("AMD IOMMUv2 functionality not available on this sytem\n");

		/*

		 * Load anyway to provide the symbols to other modules

		 * which may use AMD IOMMUv2 optionally.

		 */

		return 0;

	}



	spin_lock_init(&state_lock);
@@ -961,6 +970,9 @@ static void __exit amd_iommu_v2_exit(void) 
	size_t state_table_size;

	int i;



	if (!amd_iommu_v2_supported())

		return;



	profile_event_unregister(PROFILE_TASK_EXIT, &profile_nb);

	amd_iommu_unregister_ppr_notifier(&ppr_nb);