NAME¶

cxl_read_expected_event - read one CXL event from an AFU, and treat it as a failure, if it did not match an expected event

SYNOPSIS¶

#include <libcxl.h>

int cxl_read_expected_event(struct cxl_afu_h *afu, struct cxl_event *event, __u32 type, __u16 irq);

DESCRIPTION¶

cxl_read_expected_event() reads one CXL event from afu, when an event of type is expected, and copies it to the structure pointed to by event. For AFU interrupts, the expected AFU interrupt number irq may also be supplied (0 will accept any AFU interrupt).

RETURN VALUE¶

On success, 0 is returned if the read event was of the expected type and (if applicable) AFU interrupt number. If the event did not match the type and interrupt, -1 is returned.

On error, -2 is returned and errno is set appropriately.

ERRORS¶

EAGAIN

AFU device opened with O_NONBLOCK, and no data immediately available.

EINTR

Interrupted read() system call.

EINVAL

Invalid argument value, or AFU not opened.

EIO

Unrecoverable error.

ENODATA

No data returned by read().

ENOMEM

Insufficient memory.

FILES¶

/dev/cxl/afu<i>.<j>d

AFU device in dedicated process mode.

/dev/cxl/afu<i>.<j>m

AFU device in AFU directed mode, master context.

/dev/cxl/afu<i>.<j>s

AFU device in AFU directed mode, slave context.

SEE ALSO¶

cxl(3), cxl_afu_fd_to_h(3), cxl_afu_open_dev(3), cxl_afu_open_h(3), cxl_afu_opened(3), cxl_fprint_event(3), cxl_fprint_unknown_event(3), cxl_event_pending(3), cxl_read_event(3), open(2), read(2)