From: guoren@kernel.org
To: guoren@kernel.org, anup.patel@wdc.com, palmerdabbelt@google.com,
arnd@arndb.de, hch@lst.de
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
linux-arch@vger.kernel.org, Guo Ren <guoren@linux.alibaba.com>
Subject: [PATCH V5 1/3] riscv: Use global mappings for kernel pages
Date: Sun, 30 May 2021 16:49:24 +0000 [thread overview]
Message-ID: <1622393366-46079-2-git-send-email-guoren@kernel.org> (raw)
In-Reply-To: <1622393366-46079-1-git-send-email-guoren@kernel.org>
From: Guo Ren <guoren@linux.alibaba.com>
We map kernel pages into all addresses space, so they can be marked as
global. This allows hardware to avoid flushing the kernel mappings when
moving between address spaces.
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Palmer Dabbelt <palmerdabbelt@google.com>
---
arch/riscv/include/asm/pgtable.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 9469f46..346a3c6 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -134,7 +134,8 @@
| _PAGE_WRITE \
| _PAGE_PRESENT \
| _PAGE_ACCESSED \
- | _PAGE_DIRTY)
+ | _PAGE_DIRTY \
+ | _PAGE_GLOBAL)
#define PAGE_KERNEL __pgprot(_PAGE_KERNEL)
#define PAGE_KERNEL_READ __pgprot(_PAGE_KERNEL & ~_PAGE_WRITE)
--
2.7.4
next prev parent reply other threads:[~2021-05-30 16:50 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-30 16:49 [PATCH V5 0/3] riscv: Fixup asid_allocator remaining issues guoren
2021-05-30 16:49 ` guoren [this message]
2021-05-30 16:49 ` [PATCH V5 2/3] riscv: Add ASID-based tlbflushing methods guoren
2021-05-31 6:17 ` Christoph Hellwig
2021-05-31 12:20 ` Guo Ren
2021-05-30 16:49 ` [PATCH V5 3/3] riscv: tlbflush: Optimize coding convention guoren
2021-06-06 9:03 [RFC PATCH v2 00/11] riscv: Add DMA_COHERENT support for Allwinner D1 guoren
2021-06-06 9:03 ` [PATCH V5 1/3] riscv: Use global mappings for kernel pages guoren
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