audk/PciHotPlugInitDxe at 837d340e7f3186bedd8a8830d70e4dfc727ff004 - audk

History

Laszlo Ersek 8aba40b792 OvmfPkg: add PciHotPlugInitDxe After IncompatiblePciDeviceSupportDxe, this is another small driver / protocol implementation that tweaks the behavior of the PCI bus driver in edk2. The protocol is specified in the Platform Init Spec v1.4a, Volume 5, Chapter 12.6 "PCI Hot Plug PCI Initialization Protocol". This implementation steers the PCI bus driver to reserve the following resources ("padding") for each PCI bus, in addition to the BARs of the devices on that PCI bus: - 2MB of 64-bit non-prefetchable MMIO aperture, - 512B of IO port space. The goal is to reserve room for devices hot-plugged at runtime even if the bridge receiving the device is empty at boot time. The 2MB MMIO size is inspired by SeaBIOS. The 512B IO port size is actually only 1/8th of the PCI spec mandated reservation, but the specified size of 4096 has proved wasteful (given the limited size of our IO port space -- see commit `bba734ab4c`). Especially on Q35, where every PCIe root port and downstream port qualifies as a separate bridge (capable of accepting a single device). Test results for this patch: - regardless of our request for 64-bit MMIO reservation, it is downgraded to 32-bit, - although we request 512B alignment for the IO port space reservation, the next upstream bridge rounds it up to 4096B. Cc: "Johnson, Brian J." <bjohnson@sgi.com> Cc: Alex Williamson <alex.williamson@redhat.com> Cc: Andrew Fish <afish@apple.com> Cc: Feng Tian <feng.tian@intel.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Marcel Apfelbaum <marcel@redhat.com> Cc: Michael Kinney <michael.d.kinney@intel.com> Cc: Ruiyu Ni <ruiyu.ni@intel.com> Cc: Star Zeng <star.zeng@intel.com> Suggested-by: Andrew Fish <afish@apple.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Acked-by: Jordan Justen <jordan.l.justen@intel.com> Reviewed-by: Ruiyu Ni <Ruiyu.ni@intel.com>	2016-07-13 08:39:50 +02:00
..
PciHotPlugInit.c	OvmfPkg: add PciHotPlugInitDxe	2016-07-13 08:39:50 +02:00
PciHotPlugInit.inf	OvmfPkg: add PciHotPlugInitDxe	2016-07-13 08:39:50 +02:00

Laszlo Ersek 8aba40b792 OvmfPkg: add PciHotPlugInitDxe

After IncompatiblePciDeviceSupportDxe, this is another small driver /
protocol implementation that tweaks the behavior of the PCI bus driver in
edk2.

The protocol is specified in the Platform Init Spec v1.4a, Volume 5,
Chapter 12.6 "PCI Hot Plug PCI Initialization Protocol". This
implementation steers the PCI bus driver to reserve the following
resources ("padding") for each PCI bus, in addition to the BARs of the
devices on that PCI bus:
- 2MB of 64-bit non-prefetchable MMIO aperture,
- 512B of IO port space.

The goal is to reserve room for devices hot-plugged at runtime even if the
bridge receiving the device is empty at boot time.

The 2MB MMIO size is inspired by SeaBIOS. The 512B IO port size is
actually only 1/8th of the PCI spec mandated reservation, but the
specified size of 4096 has proved wasteful (given the limited size of our
IO port space -- see commit bba734ab4c). Especially on Q35, where every
PCIe root port and downstream port qualifies as a separate bridge (capable
of accepting a single device).

Test results for this patch:
- regardless of our request for 64-bit MMIO reservation, it is downgraded
  to 32-bit,
- although we request 512B alignment for the IO port space reservation,
  the next upstream bridge rounds it up to 4096B.

Cc: "Johnson, Brian J." <bjohnson@sgi.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Andrew Fish <afish@apple.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Marcel Apfelbaum <marcel@redhat.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Suggested-by: Andrew Fish <afish@apple.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Acked-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Ruiyu Ni <Ruiyu.ni@intel.com>

2016-07-13 08:39:50 +02:00

PciHotPlugInit.c OvmfPkg: add PciHotPlugInitDxe 2016-07-13 08:39:50 +02:00

PciHotPlugInit.inf OvmfPkg: add PciHotPlugInitDxe 2016-07-13 08:39:50 +02:00