diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index f04a2bde00184eeefedf0c53dce9c0f8bcb5b1ee..54d4a8cc38764817028dc16c556dd36389883783 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -437,5 +437,15 @@ config SMMU_BYPASS_DEV
 
 	  This feature will be replaced by ACPI IORT RMR node, which will be
 	  upstreamed in mainline.
+config IOVA_MAX_GLOBAL_MAGS
+	int "Set the max iova global magzines in iova rcache"
+	range 16 2048
+	default "32"
+	help
+	  Iova rcache global magizine is shared among every cpu. The size of
+	  it can be a bottle neck when lots of cpus are contending to use it.
+	  If you are suffering from the speed of allocing iova with more than
+	  128 cpus, try to tune this config larger.
+
 
 endif # IOMMU_SUPPORT
diff --git a/include/linux/iova.h b/include/linux/iova.h
index dfa51ae496662278c4271aa04e05e10d7a7a802d..3cb469b366d704483e921f4b9c0877b8326842d8 100644
--- a/include/linux/iova.h
+++ b/include/linux/iova.h
@@ -26,7 +26,7 @@ struct iova_magazine;
 struct iova_cpu_rcache;
 
 #define IOVA_RANGE_CACHE_MAX_SIZE 6	/* log of max cached IOVA range size (in pages) */
-#define MAX_GLOBAL_MAGS 32	/* magazines per bin */
+#define MAX_GLOBAL_MAGS CONFIG_IOVA_MAX_GLOBAL_MAGS	/* magazines per bin */
 
 struct iova_rcache {
 	spinlock_t lock;