From: Joerg Roedel <jroedel@xxxxxxx>
This function will be used from dma_direct code to determine
the maximum segment size of a dma mapping.
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
---
include/linux/swiotlb.h | 6 ++++++
kernel/dma/swiotlb.c | 5 +++++
2 files changed, 11 insertions(+)
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index ceb623321f38..5c087d330b4b 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -63,6 +63,7 @@ extern void swiotlb_tbl_sync_single(struct device *hwdev,
extern int
swiotlb_dma_supported(struct device *hwdev, u64 mask);
extern size_t swiotlb_max_mapping_size(struct device *dev);
+bool is_swiotlb_active(void);
#ifdef CONFIG_SWIOTLB
extern enum swiotlb_force swiotlb_force;
@@ -100,6 +101,11 @@ static inline size_t swiotlb_max_mapping_size(struct device *dev)
{
return SIZE_MAX;
}
+
+static inline bool is_swiotlb_active(void)
+{
+ return false;
+}
#endif /* CONFIG_SWIOTLB */
extern void swiotlb_print_info(void);
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 9cb21259cb0b..9fbd075081d9 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -667,3 +667,8 @@ size_t swiotlb_max_mapping_size(struct device *dev)
{
return ((size_t)1 << IO_TLB_SHIFT) * IO_TLB_SEGSIZE;
}
+
+bool is_swiotlb_active(void)
+{
+ return !no_iotlb_memory;
+}
--
2.17.1
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