[PATCH v4 11/14] swiotlb: Add is_dev_swiotlb_force()

[Claire Chang]

Add is_dev_swiotlb_force() which returns true if the device has
restricted DMA pool (e.g. dev->dev_swiotlb is set).

Signed-off-by: Claire Chang <tien...@chromium.org>
---
 include/linux/swiotlb.h | 9 +++++++++
 kernel/dma/swiotlb.c    | 5 +++++
 2 files changed, 14 insertions(+)

diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 76f86c684524..b9f2a250c8da 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -73,11 +73,16 @@ extern enum swiotlb_force swiotlb_force;
 
 #ifdef CONFIG_DMA_RESTRICTED_POOL
 bool is_swiotlb_force(struct device *dev);
+bool is_dev_swiotlb_force(struct device *dev);
 #else
 static inline bool is_swiotlb_force(struct device *dev)
 {
        return unlikely(swiotlb_force == SWIOTLB_FORCE);
 }
+static inline bool is_dev_swiotlb_force(struct device *dev)
+{
+       return false;
+}
 #endif /* CONFIG_DMA_RESTRICTED_POOL */
 
 bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr);
@@ -93,6 +98,10 @@ static inline bool is_swiotlb_force(struct device *dev)
 {
        return false;
 }
+static inline bool is_dev_swiotlb_force(struct device *dev)
+{
+       return false;
+}
 static inline bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr)
 {
        return false;
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index f64cbe6e84cc..fd9c1bd183ac 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -841,6 +841,11 @@ bool is_swiotlb_force(struct device *dev)
        return unlikely(swiotlb_force == SWIOTLB_FORCE) || dev->dev_swiotlb;
 }
 
+bool is_dev_swiotlb_force(struct device *dev)
+{
+       return dev->dev_swiotlb;
+}
+
 static int rmem_swiotlb_device_init(struct reserved_mem *rmem,
                                    struct device *dev)
 {
-- 
2.30.0.478.g8a0d178c01-goog