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>
Subject: [PATCH] riscv: Add support to allocate gigantic hugepages using CMA
Date: Thu, 29 Jul 2021 14:24:17 +0800 [thread overview]
Message-ID: <20210729062417.157133-1-wangkefeng.wang@huawei.com> (raw)
The RV32 only has at most 1GB memory(MAXPHYSMEM_1GB), so let's
disable HUGETLBFS on RV32. And add support to allocate gigantic
hugepages using CMA by specifying the hugetlb_cma= kernel parameter.
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
arch/riscv/Kconfig | 2 +-
arch/riscv/mm/init.c | 2 ++
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 8fcceb8eda07..20a589605307 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -33,7 +33,7 @@ config RISCV
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
- select ARCH_SUPPORTS_HUGETLBFS if MMU
+ select ARCH_SUPPORTS_HUGETLBFS if MMU && 64BIT
select ARCH_USE_MEMTEST
select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
select ARCH_WANT_FRAME_POINTERS
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index a14bf3910eec..f2268402894b 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 +217,7 @@ static void __init setup_bootmem(void)
early_init_fdt_scan_reserved_mem();
dma_contiguous_reserve(dma32_phys_limit);
+ hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
memblock_allow_resize();
}
--
2.26.2
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next reply other threads:[~2021-07-29 6:18 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-29 6:24 Kefeng Wang [this message]
2021-07-29 14:32 ` [PATCH] riscv: Add support to allocate gigantic hugepages using CMA Alex Ghiti
2021-07-30 0:58 ` Kefeng Wang
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