libnvme_read_regs(9)          libnvme API manual          libnvme_read_regs(9)

NAME
       libnvme_read_regs - Read the controller registers of a PCIe controller

SYNOPSIS
       int libnvme_read_regs (struct libnvme_transport_handle *hdl , __u32
       offset , void *buf , __u32 len );

ARGUMENTS
       hdl         Transport handle

       offset      Offset of the first register in bytes

       buf         Buffer to store the register values

       len         Number of bytes to read

DESCRIPTION
       Copies the register range [offset, offset + len) of the controller into
       buf, using 32-bit MMIO reads. The register values are stored in little-
       endian byte order, as they appear in the register map. offset and len
       must be multiples of 4 and the range must be within the first 4 KiB of
       the register map.

       This should only be sent to controller handles, not to namespaces.

RETURN
       0 on success or a negative error code otherwise. -ENOTSUP indicates
       that the transport has no memory-mapped registers.

October 2026                   libnvme_read_regs          libnvme_read_regs(9)