Re: [PATCH RFC 3/4] io-128-nonatomic: introduce io{read|write}128_{lo_hi|hi_lo}
From: Ben Dooks <hidden>
Date: 2025-11-12 14:48:58
Also in:
linux-arch, linux-arm-kernel, linux-crypto, lkml
On 12/11/2025 01:58, Chenghai Huang wrote:
quoted hunk ↗ jump to hunk
From: Weili Qian <qianweili@huawei.com> In order to provide non-atomic functions for io{read|write}128. We define a number of variants of these functions in the generic iomap that will do non-atomic operations. These functions are only defined if io{read|write}128 are defined. If they are not, then the wrappers that always use non-atomic operations from include/linux/io-128-nonatomic*.h will be used. Signed-off-by: Weili Qian <qianweili@huawei.com> Signed-off-by: Chenghai Huang <redacted> --- include/linux/io-128-nonatomic-hi-lo.h | 35 ++++++++++++++++++++++++++ include/linux/io-128-nonatomic-lo-hi.h | 34 +++++++++++++++++++++++++ 2 files changed, 69 insertions(+) create mode 100644 include/linux/io-128-nonatomic-hi-lo.h create mode 100644 include/linux/io-128-nonatomic-lo-hi.hdiff --git a/include/linux/io-128-nonatomic-hi-lo.h b/include/linux/io-128-nonatomic-hi-lo.h new file mode 100644 index 000000000000..b5b083a9e81b --- /dev/null +++ b/include/linux/io-128-nonatomic-hi-lo.h@@ -0,0 +1,35 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_IO_128_NONATOMIC_HI_LO_H_ +#define _LINUX_IO_128_NONATOMIC_HI_LO_H_ + +#include <linux/io.h> +#include <asm-generic/int-ll64.h> + +static inline u128 ioread128_hi_lo(const void __iomem *addr) +{ + u32 low, high;
did you mean u64 here?
+ high = ioread64(addr + sizeof(u64));
+ low = ioread64(addr);
+
+ return low + ((u128)high << 64);
+}
+
+static inline void iowrite128_hi_lo(u128 val, void __iomem *addr)
+{
+ iowrite64(val >> 64, addr + sizeof(u64));
+ iowrite64(val, addr);
+}
+-- Ben Dooks http://www.codethink.co.uk/ Senior Engineer Codethink - Providing Genius https://www.codethink.co.uk/privacy.html