CXL_MMIO_MAP(3)

NAME
cxl_mmio_map - map the per-process Problem State Area of an AFU to memory

SYNOPSIS
#include <libcxl.h>

int cxl_mmio_map(struct cxl_afu_h *afu, __u32 flags);

DESCRIPTION
cxl_mmio_map() maps the per-process Problem State Area of afu to the current process memory, and sets endianness according to flags: CXL_MMIO_BIG_ENDIAN, CXL_MMIO_HOST_ENDIAN or CXL_MMIO_LITTLE_ENDIAN.

The size and contents of this area are specific each AFU. The size can be discovered with cxl_get_mmio_size().

In AFU directed mode, master contexts are allowed to map all of the MMIO space and slave contexts are allowed to only map the per process MMIO space associated with the context. In dedicated process mode the entire MMIO space can always be mapped.

Only 32 and 64-bit accesses are supported by POWER8.

RETURN VALUE
On success, 0 is returned. On error, -1 is returned and errno is set appropriately.

ERRORS

EINVAL
    Invalid argument value, or AFU does not support MMIO space.

EIO AFU context is not attached.

ENODEV
    AFU not opened, or missing flags.

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_attach(3), cxl_afu_attach_full(3), cxl_afu_attach_work(3), cxl_get_mmio_size(3), cxl_mmio_ptr(3), cxl_mmio_read32(3), cxl_mmio_read64(3), cxl_mmio_unmap(3), cxl_mmio_write32(3), cxl_mmio_write64(3), mmap(3)