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iopoll: Add read_poll_timeout common API

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Add read_poll_timeout common API similar to Linux iopoll.

readx_poll_timeout will trigger read_poll_timeout with
proper op. This will help to extend the functionalities
like sleep_us to poll timeout in future.

This change is referenced from Linux from below commit:
commit <5f5323a14cad19323060a8cbf9d96f2280a462dd> ("iopoll:
introduce read_poll_timeout macro")

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
This commit is contained in:
Jagan Teki 2020-05-02 12:45:01 +05:30
parent d7c56616dc
commit 54232474d6
1 changed files with 4 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

6
include/linux/iopoll.h
View file

@ -11,7 +11,7 @@
#include <time.h>
/**
* readx_poll_timeout - Periodically poll an address until a condition is met or a timeout occurs
* read_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
@ -24,7 +24,7 @@
* 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_us) \
#define read_poll_timeout(op, addr, val, cond, timeout_us) \
({ \
unsigned long timeout = timer_get_us() + timeout_us; \
for (;;) { \
@ -39,6 +39,8 @@
(cond) ? 0 : -ETIMEDOUT; \
})
#define readx_poll_timeout(op, addr, val, cond, timeout_us) \
read_poll_timeout(op, addr, val, cond, timeout_us)
#define readb_poll_timeout(addr, val, cond, timeout_us) \
readx_poll_timeout(readb, addr, val, cond, timeout_us)