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Date: Fri, 31 May 2024 18:04:06 +0800 From: Qingfang Deng <dqfext@...il.com> To: Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, Samuel Holland <samuel.holland@...ive.com>, Qingfang Deng <qingfang.deng@...lower.com.cn>, Eric Chan <ericchancf@...gle.com>, Andrea Parri <parri.andrea@...il.com>, linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org Subject: [PATCH] RISC-V: Implement ioremap_wc/wt From: Qingfang Deng <qingfang.deng@...lower.com.cn> Currently on RISC-V, ioremap_wc/wt uses the default ioremap implementation, which maps the memory as strongly-ordered non-cacheable IO memory on systems with Svpbmt. To improve performance, map the memory as weakly-ordered non-cacheable normal memory. Signed-off-by: Qingfang Deng <qingfang.deng@...lower.com.cn> --- arch/riscv/include/asm/io.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/riscv/include/asm/io.h b/arch/riscv/include/asm/io.h index 1c5c641075d2..582503e0f508 100644 --- a/arch/riscv/include/asm/io.h +++ b/arch/riscv/include/asm/io.h @@ -133,6 +133,14 @@ __io_writes_outs(outs, u64, q, __io_pbr(), __io_paw()) #define outsq(addr, buffer, count) __outsq(PCI_IOBASE + (addr), buffer, count) #endif +#ifdef CONFIG_MMU +#define ioremap_wc(addr, size) \ + ioremap_prot((addr), (size), \ + (_PAGE_KERNEL & ~_PAGE_MTMASK) | _PAGE_NOCACHE) + +#define ioremap_wt ioremap_wc +#endif + #include <asm-generic/io.h> #ifdef CONFIG_MMU -- 2.34.1
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