IABSD.fr/src/sys/dev/ofw

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• Author : patrick
  Date : 2021-06-25 17:41:22
  Hash : 415019ce
  Message : While it seems like we can choose any I/O virtual address for peripheral devices, this isn't really the case. It depends on the bus topology of how devices are connected. In the case of PCIe, devices are assigned addresses (in PCI BARs) from the PCI address spaces. Now if we take an address from one of these address spaces for our IOVA, transfers from from a PCI device to that address will terminate inside of the PCI bus. This is because from the PCI buses' point-of-view, the address we chose is part of its address space. To make sure we don't allocate addresses from there, reserve the PCI addresses in the IOVA. Note that smmu(4) currently gives each device its own IOVA. So the PCI addresses will be reserved only in IOVA from PCI devices, and only the addresses concerning the PCI bus it is connected to will be reserved. All other devices behind an smmu(4) will not have any changes to their IOVA. ok kettenis@

• Files
• fdt.c
• fdt.h
• files.ofw
• ofw_clock.c
• ofw_clock.h
• ofw_gpio.c
• ofw_gpio.h
• ofw_misc.c
• ofw_misc.h
• ofw_pci.h
• ofw_pinctrl.c
• ofw_pinctrl.h
• ofw_power.c
• ofw_power.h
• ofw_regulator.c
• ofw_regulator.h
• ofw_thermal.c
• ofw_thermal.h
• openfirm.h