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From: guoren@kernel.org
To: guoren@kernel.org, anup.patel@wdc.com, palmerdabbelt@google.com,
	arnd@arndb.de, wens@csie.org, maxime@cerno.tech,
	drew@beagleboard.org, liush@allwinnertech.com,
	lazyparser@gmail.com, wefu@redhat.com
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	linux-arch@vger.kernel.org, linux-sunxi@lists.linux.dev,
	Guo Ren <guoren@linux.alibaba.com>
Subject: [PATCH V5 1/3] riscv: Use global mappings for kernel pages
Date: Sun,  6 Jun 2021 09:03:57 +0000	[thread overview]
Message-ID: <1622970249-50770-3-git-send-email-guoren@kernel.org> (raw)
In-Reply-To: <1622970249-50770-1-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


  parent reply	other threads:[~2021-06-06  9:05 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-06  9:03 [RFC PATCH v2 00/11] riscv: Add DMA_COHERENT support for Allwinner D1 guoren
2021-06-06  9:03 ` [RFC PATCH v2 01/11] riscv: asid: Use global mappings for kernel pages guoren
2021-06-06  9:03 ` guoren [this message]
2021-06-06  9:03 ` [PATCH V5 2/3] riscv: Add ASID-based tlbflushing methods guoren
2021-06-06 14:38   ` Christoph Hellwig
2021-06-06  9:03 ` [RFC PATCH v2 02/11] riscv: asid: " guoren
2021-06-06  9:04 ` [RFC PATCH v2 03/11] riscv: asid: Optimize tlbflush coding convention guoren
2021-06-06  9:04 ` [PATCH V5 3/3] riscv: tlbflush: Optimize " guoren
2021-06-06  9:04 ` [RFC PATCH v2 04/11] riscv: pgtable: Fixup _PAGE_CHG_MASK usage guoren
2021-06-06  9:04 ` [RFC PATCH v2 05/11] riscv: pgtable: Add custom protection_map init guoren
2021-06-06  9:04 ` [RFC PATCH v2 06/11] riscv: pgtable: Add DMA_COHERENT with custom PTE attributes guoren
2021-06-06 14:39   ` Christoph Hellwig
2021-06-06 15:08     ` Guo Ren
2021-06-06 17:22   ` Nick Kossifidis
2021-06-07  6:19     ` Christoph Hellwig
2021-06-06  9:04 ` [RFC PATCH v2 07/11] riscv: cmo: Add dma-noncoherency support guoren
2021-10-17  9:28   ` twd2
2021-10-20  8:11     ` Guo Ren
2021-06-06  9:04 ` [RFC PATCH v2 08/11] riscv: cmo: Add vendor custom icache sync guoren
2021-06-06  9:04 ` [RFC PATCH v2 09/11] riscv: soc: Initial DTS for Allwinner D1 NeZha board guoren
2021-06-06 16:26   ` Jernej Škrabec
2021-06-06 17:05     ` Guo Ren
2021-06-07  3:44     ` Guo Ren
2021-06-07  7:27       ` Maxime Ripard
2021-06-07  7:53         ` Guo Ren
2021-06-07  7:24   ` Maxime Ripard
2021-06-07  8:07     ` Guo Ren
2021-06-14 15:33       ` Maxime Ripard
2021-06-14 16:28         ` Guo Ren
2021-06-14 16:31           ` Jernej Škrabec
2021-06-06  9:04 ` [RFC PATCH v2 10/11] riscv: soc: Add Allwinner SoC kconfig option guoren
2021-06-07  7:19   ` Maxime Ripard
2021-06-07  7:27     ` Arnd Bergmann
2021-06-07  7:45       ` Guo Ren
2021-06-07  7:43     ` Guo Ren
2021-06-07 12:12       ` Maxime Ripard
2021-06-07 12:39         ` Guo Ren
2021-06-06  9:04 ` [RFC PATCH v2 11/11] riscv: soc: Allwinner D1 GMAC driver only for temp use guoren
2021-06-06 10:50   ` Andre Przywara
2021-06-06 15:32     ` Guo Ren
2021-06-06 15:39       ` Jernej Škrabec
2021-06-06 15:41         ` Guo Ren
2021-06-06 16:16   ` Arnd Bergmann
2021-06-06 16:32     ` Jernej Škrabec
2021-06-06 16:53       ` Guo Ren
2021-06-06 16:53     ` Guo Ren
2021-06-06 16:29 ` [RFC PATCH v2 00/11] riscv: Add DMA_COHERENT support for Allwinner D1 Jernej Škrabec
2021-06-06 16:54   ` Guo Ren
2021-06-06 17:14     ` Jernej Škrabec
2021-06-06 23:42       ` Guo Ren
2021-06-07  3:44 ` Anup Patel
2021-06-07  4:36   ` Guo Ren

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