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From: Alexandre Ghiti <alex@ghiti.fr>
To: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>, Zong Li <zong.li@sifive.com>,
	Anup Patel <anup@brainfault.org>, Christoph Hellwig <hch@lst.de>,
	Ard Biesheuvel <ardb@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
	linux-efi@vger.kernel.org, linux-arch@vger.kernel.org,
	linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Cc: Alexandre Ghiti <alex@ghiti.fr>
Subject: [RFC PATCH 05/12] riscv: Simplify MAXPHYSMEM config
Date: Mon,  4 Jan 2021 14:58:33 -0500	[thread overview]
Message-ID: <20210104195840.1593-6-alex@ghiti.fr> (raw)
In-Reply-To: <20210104195840.1593-1-alex@ghiti.fr>

Either the user specifies maximum physical memory size of 2GB or the
user lives with the system constraint which is 1/4th of maximum
addressable memory in Sv39 MMU mode (i.e. 128GB) for now.

Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
Reviewed-by: Anup Patel <anup@brainfault.org>
---
 arch/riscv/Kconfig | 20 ++++++--------------
 1 file changed, 6 insertions(+), 14 deletions(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 2979a44103be..852ab2f7a50d 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -127,7 +127,7 @@ config PAGE_OFFSET
 	default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB
 	default 0x80000000 if 64BIT && !MMU
 	default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB
-	default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB
+	default 0xffffffe000000000 if 64BIT && !MAXPHYSMEM_2GB
 
 config ARCH_FLATMEM_ENABLE
 	def_bool y
@@ -235,19 +235,11 @@ config MODULE_SECTIONS
 	bool
 	select HAVE_MOD_ARCH_SPECIFIC
 
-choice
-	prompt "Maximum Physical Memory"
-	default MAXPHYSMEM_2GB if 32BIT
-	default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW
-	default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY
-
-	config MAXPHYSMEM_2GB
-		bool "2GiB"
-	config MAXPHYSMEM_128GB
-		depends on 64BIT && CMODEL_MEDANY
-		bool "128GiB"
-endchoice
-
+config MAXPHYSMEM_2GB
+	bool "Maximum Physical Memory 2GiB"
+	default y if 32BIT
+	default y if 64BIT && CMODEL_MEDLOW
+	default n
 
 config SMP
 	bool "Symmetric Multi-Processing"
-- 
2.20.1


  parent reply	other threads:[~2021-01-04 20:05 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-04 19:58 [RFC PATCH 00/12] Introduce sv48 support without relocable kernel Alexandre Ghiti
2021-01-04 19:58 ` [RFC PATCH 01/12] riscv: Move kernel mapping outside of linear mapping Alexandre Ghiti
2021-01-05 11:40   ` Anup Patel
2021-01-06  6:36     ` Alex Ghiti
2021-01-06  6:44       ` Anup Patel
2021-01-06  8:16         ` Alex Ghiti
2021-01-04 19:58 ` [RFC PATCH 02/12] riscv: Protect the kernel " Alexandre Ghiti
2021-01-05 11:50   ` Anup Patel
2021-01-04 19:58 ` [RFC PATCH 03/12] riscv: Get rid of compile time logic with MAX_EARLY_MAPPING_SIZE Alexandre Ghiti
2021-01-04 19:58 ` [RFC PATCH 04/12] riscv: Allow to dynamically define VA_BITS Alexandre Ghiti
2021-01-05 12:06   ` Anup Patel
2021-01-06  6:38     ` Alex Ghiti
2021-01-04 19:58 ` Alexandre Ghiti [this message]
2021-01-04 19:58 ` [RFC PATCH 06/12] riscv: Prepare ptdump for vm layout dynamic addresses Alexandre Ghiti
2021-01-04 19:58 ` [RFC PATCH 07/12] asm-generic: Prepare for riscv use of pud_alloc_one and pud_free Alexandre Ghiti
2021-01-04 19:58 ` [RFC PATCH 08/12] riscv: Implement sv48 support Alexandre Ghiti
2021-01-04 19:58 ` [RFC PATCH 09/12] riscv: Allow user to downgrade to sv39 when hw supports sv48 Alexandre Ghiti
2021-01-04 19:58 ` [RFC PATCH 10/12] riscv: Use pgtable_l4_enabled to output mmu type in cpuinfo Alexandre Ghiti
2021-01-04 19:58 ` [RFC PATCH 11/12] riscv: Explicit comment about user virtual address space size Alexandre Ghiti
2021-01-04 19:58 ` [RFC PATCH 12/12] riscv: Improve virtual kernel memory layout dump Alexandre Ghiti
2021-01-30  9:33 ` [RFC PATCH 00/12] Introduce sv48 support without relocable kernel Alex Ghiti
2021-02-03  3:04   ` Palmer Dabbelt

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