Documentation/PCI/pci.rst

46   - Request MMIO/IOP resources
62   - Release MMIO/IOP resources
183   - Request MMIO/IOP resources
236 Request MMIO/IOP resources
238 Memory (MMIO), and I/O port addresses should NOT be read directly
254    determine MMIO and IO Port resource availability _after_ calling
258 (for MMIO ranges) and request_region() (for IO Port ranges).
354    This guarantee allows the driver to omit MMIO reads to flush
372   - Disable device from responding to MMIO/IO Port addresses
373   - Release MMIO/IO Port resource(s)
437 Disable Device from responding to MMIO/IO Port addresses
439 io_unmap() MMIO or IO Port resources and then call pci_disable_device().
444 Release MMIO/IO Port Resource(s)
446 Call pci_release_region() to mark the MMIO or IO Port range as available.
541 MMIO Space and "Write Posting"
544 Converting a driver from using I/O Port space to using MMIO space
548 device before the CPU can continue. Writes to MMIO space allow the CPU
562 The same sequence for MMIO space should be::
577 MMIO reads to master abort (a.k.a. "Soft Fail") and return garbage