On Tue, Jun 12, 2018 at 01:52:47PM -0700, Andrey Smirnov wrote:
> Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
> ---
> include/linux/iopoll.h | 69 ++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 69 insertions(+)
> create mode 100644 include/linux/iopoll.h
>
> diff --git a/include/linux/iopoll.h b/include/linux/iopoll.h
> new file mode 100644
> index 000000000..6e8a6fd71
> --- /dev/null
> +++ b/include/linux/iopoll.h
> @@ -0,0 +1,69 @@
> +/*
> + * Copyright (c) 2012-2014 The Linux Foundation. All rights reserved.
> + *
> + * SPDX-License-Identifier: GPL-2.0
> + */
> +
> +#ifndef _LINUX_IOPOLL_H
> +#define _LINUX_IOPOLL_H
> +
> +#include <errno.h>
> +#include <io.h>
> +#include <clock.h>
> +
> +/**
> + * readx_poll_timeout - Periodically poll an address until a condition is met or a timeout occurs
> + * @op: accessor function (takes @addr as its only argument)
> + * @addr: Address to poll
> + * @val: Variable to read the value into
> + * @cond: Break condition (usually involving @val)
> + * @timeout_ns: Timeout in ns, 0 means never timeout
nanoseconds here,
> + *
> + * Returns 0 on success and -ETIMEDOUT upon a timeout. In either
> + * case, the last read value at @addr is stored in @val.
> + *
> + * When available, you'll probably want to use one of the specialized
> + * macros defined below rather than this macro directly.
> + */
> +#define readx_poll_timeout(op, addr, val, cond, timeout_ns) \
and here,
> +({ \
> + uint64_t start = get_time_ns(); \
> + for (;;) { \
> + (val) = op(addr); \
> + if (cond) \
> + break; \
> + if (timeout_ns && \
> + is_timeout(start, (timeout_ns))) { \
> + (val) = op(addr); \
> + break; \
> + } \
> + } \
> + (cond) ? 0 : -ETIMEDOUT; \
> +})
> +
> +
> +#define readb_poll_timeout(addr, val, cond, timeout_us) \
> + readx_poll_timeout(readb, addr, val, cond, timeout_us)
but microseconds here?
We should be consistent to the kernel API here, it's too easy to just
copy Linux code without noticing that the units are different.
Sascha
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