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Diffstat (limited to 'arch/riscv/mm/init.c')
-rw-r--r--arch/riscv/mm/init.c29
1 files changed, 20 insertions, 9 deletions
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index b0793dc0c291..180d6a3e2a05 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -120,13 +120,7 @@ void __init mem_init(void)
BUG_ON(!mem_map);
#endif /* CONFIG_FLATMEM */
-#ifdef CONFIG_SWIOTLB
- if (swiotlb_force == SWIOTLB_FORCE ||
- max_pfn > PFN_DOWN(dma32_phys_limit))
- swiotlb_init(1);
- else
- swiotlb_force = SWIOTLB_NO_FORCE;
-#endif
+ swiotlb_init(max_pfn > PFN_DOWN(dma32_phys_limit), SWIOTLB_VERBOSE);
memblock_free_all();
print_vm_layout();
@@ -208,8 +202,25 @@ static void __init setup_bootmem(void)
* early_init_fdt_reserve_self() since __pa() does
* not work for DTB pointers that are fixmap addresses
*/
- if (!IS_ENABLED(CONFIG_BUILTIN_DTB))
- memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
+ if (!IS_ENABLED(CONFIG_BUILTIN_DTB)) {
+ /*
+ * In case the DTB is not located in a memory region we won't
+ * be able to locate it later on via the linear mapping and
+ * get a segfault when accessing it via __va(dtb_early_pa).
+ * To avoid this situation copy DTB to a memory region.
+ * Note that memblock_phys_alloc will also reserve DTB region.
+ */
+ if (!memblock_is_memory(dtb_early_pa)) {
+ size_t fdt_size = fdt_totalsize(dtb_early_va);
+ phys_addr_t new_dtb_early_pa = memblock_phys_alloc(fdt_size, PAGE_SIZE);
+ void *new_dtb_early_va = early_memremap(new_dtb_early_pa, fdt_size);
+
+ memcpy(new_dtb_early_va, dtb_early_va, fdt_size);
+ early_memunmap(new_dtb_early_va, fdt_size);
+ _dtb_early_pa = new_dtb_early_pa;
+ } else
+ memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
+ }
early_init_fdt_scan_reserved_mem();
dma_contiguous_reserve(dma32_phys_limit);