On Thursday 08 April 2010 02:10:28 David Young wrote: > I would like for MI drivers to be able to override pci(9), bus_space(9), > and bus_dma(9) behavior for the purpose of handling exceptions, managing > bus resources, creating test harnesses, and counting events. > > Matt Thomas nudged me in some private discussions to leave MD the > bus_space_tag_t and pci_chipset_tag_t, instead of embedding an MI tag, > and to let each architecture provide its own implementation of an > MI override functions for bus_space(9) and pci(9). Matt powerfully > influenced the look of the override API. >
Hi, If for example a PCI device is behind an USB interface, should the bus space methods take a mutex argument to allow sleeping which is due to the fact that USB cannot complete the I/O operation immediately? --HPS
