linux-kernel - [PATCH] riscv: Implement ioremap

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Date:   Wed, 16 Nov 2022 10:57:09 +0800
From:   Jianwen Jiang <jiangjianwen@...ontech.com>
To:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, alexandre.ghiti@...onical.comp,
        geert@...ux-m68k.org, panqinglin2020@...as.ac.cn, arnd@...db.de
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Jianwen Jiang <jiangjianwen@...ontech.com>
Subject: [PATCH] riscv: Implement ioremap_prot support

Feature ioremap_prot only needs an implementation of pte_pgprot on riscv.
That macro is similar on platform loongarch, mips and sh.
We just need to replace _PFN_MASK with _PAGE_PFN_MASK, and select
HAVE_IOREMAP_PROT in arch/riscv/Kconfig.

Signed-off-by: Jianwen Jiang <jiangjianwen@...ontech.com>
---
 arch/riscv/Kconfig            | 1 +
 arch/riscv/include/asm/page.h | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index fa78595a6089..5ed2c7361040 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -95,6 +95,7 @@ config RISCV
 	select HAVE_FUNCTION_ERROR_INJECTION
 	select HAVE_GCC_PLUGINS
 	select HAVE_GENERIC_VDSO if MMU && 64BIT
+	select HAVE_IOREMAP_PROT
 	select HAVE_IRQ_TIME_ACCOUNTING
 	select HAVE_KPROBES if !XIP_KERNEL
 	select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL
diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
index ac70b0fd9a9a..d379b4702849 100644
--- a/arch/riscv/include/asm/page.h
+++ b/arch/riscv/include/asm/page.h
@@ -84,6 +84,8 @@ typedef struct page *pgtable_t;
 #define __pgd(x)	((pgd_t) { (x) })
 #define __pgprot(x)	((pgprot_t) { (x) })
 
+#define pte_pgprot(x)	__pgprot(pte_val(x) & ~_PAGE_PFN_MASK)
+
 #ifdef CONFIG_64BIT
 #define PTE_FMT "%016lx"
 #else
-- 
2.37.3.446.gd42b38dfb5