riscv: Support allocating gigantic hugepages using CMA

This patch adds support to allocate gigantic hugepages using CMA by
specifying the hugetlb_cma= kernel parameter.  This is only supported on
RV64.

Reviewed-by: Alexandre Ghiti <alex@ghiti.fr>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 888dff9..248f9ec 100644 (file)
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -19,6 +19,7 @@
 #include <linux/set_memory.h>
 #include <linux/dma-map-ops.h>
 #include <linux/crash_dump.h>
+#include <linux/hugetlb.h>
 
 #include <asm/fixmap.h>
 #include <asm/tlbflush.h>
@@ -202,6 +203,8 @@ static void __init setup_bootmem(void)
 
        early_init_fdt_scan_reserved_mem();
        dma_contiguous_reserve(dma32_phys_limit);
+       if (IS_ENABLED(CONFIG_64BIT))
+               hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
        memblock_allow_resize();
 }