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authorJoerg Roedel <joerg.roedel@amd.com>2012-03-15 15:46:40 +0400
committerJoerg Roedel <joerg.roedel@amd.com>2012-03-15 15:46:40 +0400
commit474d567db3d459d08ed0e683f4ace9b00ac2aa4b (patch)
tree113b7f0cde335f43aadfd0f0861d544b14103bf2 /drivers/iommu
parent525b233c7188069a360a898493d9b51ee8adec35 (diff)
downloadlinux-474d567db3d459d08ed0e683f4ace9b00ac2aa4b.tar.xz
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: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/amd_iommu_v2.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c
index 8add9f125d3e..036fe9bf157e 100644
--- a/drivers/iommu/amd_iommu_v2.c
+++ b/drivers/iommu/amd_iommu_v2.c
@@ -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);