NAME¶

cxl_afu_attach - attach the calling process's memory to an open AFU

SYNOPSIS¶

#include <libcxl.h>

int cxl_afu_attach(struct cxl_afu_h *afu, __u64 wed);

DESCRIPTION¶

cxl_afu_attach() attaches a context of afu to the current process, specifies wed as the initial work element descriptor, and starts the AFU context.

On success, all memory mapped into this process is accessible to the AFU context using the same effective addresses. No additional calls are required to map/unmap memory. The AFU memory context will be updated as userspace allocates and frees memory.

The work element descriptor wed is a 64-bit argument defined by the AFU. Typically this is an effective address pointing to an AFU specific structure describing what work to perform.

The minimum number of userspace interrupts required by the AFU will be allocated. This value is returned by cxl_get_irqs_min().

RETURN VALUE¶

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

ERRORS¶

EINVAL

Invalid argument value, or AFU not opened.

ENOMEM

Not enough memory.

ENOSPC

Not enough interrupts available.

SEE ALSO¶

cxl(3), cxl_afu_attach_full(3), cxl_afu_attach_work(3), cxl_afu_fd_to_h(3), cxl_afu_free(3), cxl_afu_open_dev(3), cxl_afu_opened(3), cxl_get_irqs_max(3), cxl_get_irqs_min(3), cxl_get_prefault_mode(3), cxl_mmio_map(3), cxl_set_mode(3), cxl_set_prefault_mode(3)