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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


WARNING: multiple messages have this Message-ID (diff)
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


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  reply	other threads:[~2021-05-30 16:50 UTC|newest]

Thread overview: 14+ 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
2021-05-30 16:49 ` guoren [this message]
2021-05-30 16:49   ` [PATCH V5 1/3] riscv: Use global mappings for kernel pages guoren
2021-05-30 16:49 ` [PATCH V5 2/3] riscv: Add ASID-based tlbflushing methods guoren
2021-05-30 16:49   ` guoren
2021-05-31  6:17   ` Christoph Hellwig
2021-05-31  6:17     ` Christoph Hellwig
2021-05-31 12:20     ` Guo Ren
2021-05-31 12:20       ` Guo Ren
2021-05-30 16:49 ` [PATCH V5 3/3] riscv: tlbflush: Optimize coding convention guoren
2021-05-30 16:49   ` 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
2021-06-06  9:03   ` guoren

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