diff --git a/arch/arm64/configs/qcom.config b/arch/arm64/configs/qcom.config
index 9466461272165..8d923fd7854d3 100644
--- a/arch/arm64/configs/qcom.config
+++ b/arch/arm64/configs/qcom.config
@@ -57,6 +57,7 @@ CONFIG_STM_PROTO_SYS_T=m
 CONFIG_STM_SOURCE_CONSOLE=m
 CONFIG_STM_SOURCE_FTRACE=m
 CONFIG_STM_SOURCE_HEARTBEAT=m
+CONFIG_SWIOTLB_DEFAULT_SIZE_MB=2
 CONFIG_SENSORS_AMC6821=y
 CONFIG_SENSORS_EMC2305=y
 CONFIG_SENSORS_QCOM_BCL=y
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 3dae0f592063e..aef861f1e2d7e 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -32,8 +32,16 @@ struct scatterlist;
 #define IO_TLB_SHIFT 11
 #define IO_TLB_SIZE (1 << IO_TLB_SHIFT)
 
-/* default to 64MB */
-#define IO_TLB_DEFAULT_SIZE (64UL<<20)
+/*
+ * Default SWIOTLB bounce buffer pool size.
+ * Configurable at compile time via CONFIG_SWIOTLB_DEFAULT_SIZE_MB.
+ * Falls back to 64 MB if not set via Kconfig.
+ */
+#if defined(CONFIG_SWIOTLB) && defined(CONFIG_SWIOTLB_DEFAULT_SIZE_MB)
+#define IO_TLB_DEFAULT_SIZE ((unsigned long)CONFIG_SWIOTLB_DEFAULT_SIZE_MB << 20)
+#else
+#define IO_TLB_DEFAULT_SIZE (64UL << 20)
+#endif
 
 unsigned long swiotlb_size_or_default(void);
 void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
index 31cfdb6b4bc3e..5f225adf9f837 100644
--- a/kernel/dma/Kconfig
+++ b/kernel/dma/Kconfig
@@ -89,6 +89,27 @@ config SWIOTLB
 	bool
 	select NEED_DMA_MAP_STATE
 
+config SWIOTLB_DEFAULT_SIZE_MB
+	int "Default SWIOTLB bounce buffer size in MB"
+	depends on SWIOTLB
+	range 1 64
+	default 64
+	help
+	  Sets the default size of the software IO TLB (SWIOTLB) bounce buffer
+	  pool allocated at boot time. The default is 64 MB.
+
+	  On memory-constrained embedded or mobile platforms (e.g., those with
+	  a hardware IOMMU such as ARM SMMU covering most DMA-capable devices),
+	  a smaller value such as 4 or 8 MB may be sufficient. The SWIOTLB is
+	  then only needed for devices that bypass the IOMMU or have restricted
+	  DMA address ranges.
+
+	  The minimum allowed value is 1 MB. This compile-time default can be
+	  overridden at runtime using the "swiotlb=<nslabs>" kernel command line
+	  parameter, where nslabs = (desired_size_in_bytes / 2048).
+
+	  If unsure, leave at the default value of 64.
+
 config SWIOTLB_DYNAMIC
 	bool "Dynamic allocation of DMA bounce buffers"
 	default n