i2o_pci_alloc(9) centos man page | unix.com

I2O_PCI_ALLOC(9)					       Message-based devices						  I2O_PCI_ALLOC(9)

NAME
       i2o_pci_alloc - Allocate DMA memory, map IO memory for I2O controller

SYNOPSIS
       int i2o_pci_alloc(struct i2o_controller * c);

ARGUMENTS
       c
	   I2O controller

DESCRIPTION
       Allocate DMA memory for a PCI (or in theory AGP) I2O controller. All IO mappings are also done here. If MTRR is enabled, also do add memory
       regions here.

       Returns 0 on success or negative error code on failure.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							  I2O_PCI_ALLOC(9)