max_segment = rounddown(val, PAGE_SIZE);
}
-/* default to 64MB */
-#define IO_TLB_DEFAULT_SIZE (64UL<<20)
unsigned long swiotlb_size_or_default(void)
{
unsigned long size;
return size ? size : (IO_TLB_DEFAULT_SIZE);
}
+void __init swiotlb_adjust_size(unsigned long new_size)
+{
+ unsigned long size;
+
+ /*
+ * If swiotlb parameter has not been specified, give a chance to
+ * architectures such as those supporting memory encryption to
+ * adjust/expand SWIOTLB size for their use.
+ */
+ if (!io_tlb_nslabs) {
+ size = ALIGN(new_size, 1 << IO_TLB_SHIFT);
+ io_tlb_nslabs = size >> IO_TLB_SHIFT;
+ io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
+
+ pr_info("SWIOTLB bounce buffer size adjusted to %luMB", size >> 20);
+ }
+}
+
void swiotlb_print_info(void)
{
unsigned long bytes = io_tlb_nslabs << IO_TLB_SHIFT;