swiotlb: search the software IO TLB only if the device makes use of it

Skip searching the software IO TLB if a device has never used it, making
sure these devices are not affected by the introduction of multiple IO TLB
memory pools.

Additional memory barrier is required to ensure that the new value of the
flag is visible to other CPUs after mapping a new bounce buffer. For
efficiency, the flag check should be inlined, and then the memory barrier
must be moved to is_swiotlb_buffer(). However, it can replace the existing
barrier in swiotlb_find_pool(), because all callers use is_swiotlb_buffer()
first to verify that the buffer address belongs to the software IO TLB.

Signed-off-by: Petr Tesarik <petr.tesarik.ext@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/device.h b/include/linux/device.h
index 5fd89c9d005c..6fc808d22bfd 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -628,6 +628,7 @@ struct device_physical_location {
  * @dma_io_tlb_mem: Software IO TLB allocator.  Not for driver use.
  * @dma_io_tlb_pools:	List of transient swiotlb memory pools.
  * @dma_io_tlb_lock:	Protects changes to the list of active pools.
+ * @dma_uses_io_tlb: %true if device has used the software IO TLB.
  * @archdata:	For arch-specific additions.
  * @of_node:	Associated device tree node.
  * @fwnode:	Associated device node supplied by platform firmware.
@@ -737,6 +738,7 @@ struct device {
 #ifdef CONFIG_SWIOTLB_DYNAMIC
 	struct list_head dma_io_tlb_pools;
 	spinlock_t dma_io_tlb_lock;
+	bool dma_uses_io_tlb;
 #endif
 	/* arch specific additions */
 	struct dev_archdata	archdata;