[PATCH v2] riscv: Add support to allocate gigantic hugepages using CMA

From: Kefeng Wang <wangkefeng.wang@huawei.com>
To: Palmer Dabbelt <palmer@dabbelt.com>, <linux-riscv@lists.infradead.org>
Cc: <palmerdabbelt@google.com>, <paul.walmsley@sifive.com>,
	<aou@eecs.berkeley.edu>, Kefeng Wang <wangkefeng.wang@huawei.com>,
	"Alexandre Ghiti" <alex@ghiti.fr>
Subject: [PATCH v2] riscv: Add support to allocate gigantic hugepages using CMA
Date: Fri, 30 Jul 2021 09:30:17 +0800	[thread overview]
Message-ID: <20210730013017.50651-1-wangkefeng.wang@huawei.com> (raw)

commit 9e953cda5cdf ("riscv: Introduce huge page support for32/64bit
kernel") add support gigantic hugepage support for RV64.

This patch add support to allocate gigantic hugepages using CMA by
specifying the hugetlb_cma= kernel parameter on RV64.

Cc: Alexandre Ghiti <alex@ghiti.fr>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
v2: don't disable hugepage support on RV32.

 arch/riscv/mm/init.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index a14bf3910eec..e547e53cddd2 100644
--- 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>
@@ -216,6 +217,8 @@ 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();
 }
 
-- 
2.26.2


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