swiotlb: Export swiotlb_max_segment to users

[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / lib / swiotlb.c

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 9def738af4f4e56861e1096b27a29ad4acd2b3d2..975b8fc4f1e1143dcdd295731cf1fc18cf0561fe 100644 (file)
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -82,6 +82,12 @@ static phys_addr_t io_tlb_overflow_buffer;
 static unsigned int *io_tlb_list;
 static unsigned int io_tlb_index;
 
+/*
+ * Max segment that we can provide which (if pages are contingous) will
+ * not be bounced (unless SWIOTLB_FORCE is set).
+ */
+unsigned int max_segment;
+
 /*
  * We need to save away the original address corresponding to a mapped entry
  * for the sync operations.
@@ -124,6 +130,20 @@ unsigned long swiotlb_nr_tbl(void)
 }
 EXPORT_SYMBOL_GPL(swiotlb_nr_tbl);
 
+unsigned int swiotlb_max_segment(void)
+{
+       return max_segment;
+}
+EXPORT_SYMBOL_GPL(swiotlb_max_segment);
+
+void swiotlb_set_max_segment(unsigned int val)
+{
+       if (swiotlb_force == SWIOTLB_FORCE)
+               max_segment = 1;
+       else
+               max_segment = rounddown(val, PAGE_SIZE);
+}
+
 /* default to 64MB */
 #define IO_TLB_DEFAULT_SIZE (64UL<<20)
 unsigned long swiotlb_size_or_default(void)
@@ -205,6 +225,7 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
        if (verbose)
                swiotlb_print_info();
 
+       swiotlb_set_max_segment(io_tlb_nslabs << IO_TLB_SHIFT);
        return 0;
 }
 
@@ -283,6 +304,7 @@ swiotlb_late_init_with_default_size(size_t default_size)
        rc = swiotlb_late_init_with_tbl(vstart, io_tlb_nslabs);
        if (rc)
                free_pages((unsigned long)vstart, order);
+
        return rc;
 }
 
@@ -337,6 +359,8 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
 
        late_alloc = 1;
 
+       swiotlb_set_max_segment(io_tlb_nslabs << IO_TLB_SHIFT);
+
        return 0;
 
 cleanup4:
@@ -351,6 +375,7 @@ cleanup2:
        io_tlb_end = 0;
        io_tlb_start = 0;
        io_tlb_nslabs = 0;
+       max_segment = 0;
        return -ENOMEM;
 }
 
@@ -379,6 +404,7 @@ void __init swiotlb_free(void)
                                   PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
        }
        io_tlb_nslabs = 0;
+       max_segment = 0;
 }
 
 int is_swiotlb_buffer(phys_addr_t paddr)