linux/arch/x86/pci
Jon Mason b03e7495a8 PCI: Set PCI-E Max Payload Size on fabric
On a given PCI-E fabric, each device, bridge, and root port can have a
different PCI-E maximum payload size.  There is a sizable performance
boost for having the largest possible maximum payload size on each PCI-E
device.  However, if improperly configured, fatal bus errors can occur.
Thus, it is important to ensure that PCI-E payloads sends by a device
are never larger than the MPS setting of all devices on the way to the
destination.

This can be achieved two ways:

- A conservative approach is to use the smallest common denominator of
  the entire tree below a root complex for every device on that fabric.

This means for example that having a 128 bytes MPS USB controller on one
leg of a switch will dramatically reduce performances of a video card or
10GE adapter on another leg of that same switch.

It also means that any hierarchy supporting hotplug slots (including
expresscard or thunderbolt I suppose, dbl check that) will have to be
entirely clamped to 128 bytes since we cannot predict what will be
plugged into those slots, and we cannot change the MPS on a "live"
system.

- A more optimal way is possible, if it falls within a couple of
  constraints:
* The top-level host bridge will never generate packets larger than the
  smallest TLP (or if it can be controlled independently from its MPS at
  least)
* The device will never generate packets larger than MPS (which can be
  configured via MRRS)
* No support of direct PCI-E <-> PCI-E transfers between devices without
  some additional code to specifically deal with that case

Then we can use an approach that basically ignores downstream requests
and focuses exclusively on upstream requests. In that case, all we need
to care about is that a device MPS is no larger than its parent MPS,
which allows us to keep all switches/bridges to the max MPS supported by
their parent and eventually the PHB.

In this case, your USB controller would no longer "starve" your 10GE
Ethernet and your hotplug slots won't affect your global MPS.
Additionally, the hotplugged devices themselves can be configured to a
larger MPS up to the value configured in the hotplug bridge.

To choose between the two available options, two PCI kernel boot args
have been added to the PCI calls.  "pcie_bus_safe" will provide the
former behavior, while "pcie_bus_perf" will perform the latter behavior.
By default, the latter behavior is used.

NOTE: due to the location of the enablement, each arch will need to add
calls to this function.  This patch only enables x86.

This patch includes a number of changes recommended by Benjamin
Herrenschmidt.

Tested-by: Jordan_Hargrave@dell.com
Signed-off-by: Jon Mason <mason@myri.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2011-08-01 11:49:16 -07:00
..
acpi.c PCI: Set PCI-E Max Payload Size on fabric 2011-08-01 11:49:16 -07:00
amd_bus.c x86: Adjust section placement in AMD northbridge related code 2011-02-10 13:32:52 +01:00
broadcom_bus.c x86/PCI: don't use native Broadcom CNB20LE driver when ACPI is available 2011-01-14 08:55:41 -08:00
bus_numa.c Merge branch 'x86-bootmem-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-03-03 08:15:05 -08:00
bus_numa.h Merge branch 'x86-bootmem-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-03-03 08:15:05 -08:00
ce4100.c x86/PCI: config space accessor functions should not ignore the segment argument 2011-07-22 08:25:41 -07:00
common.c x86/PCI: Preserve existing pci=bfsort whitelist for Dell systems 2011-07-22 08:44:28 -07:00
direct.c x86/PCI: config space accessor functions should not ignore the segment argument 2011-07-22 08:25:41 -07:00
early.c x86/PCI: remove early PCI pr_debug statements 2009-11-24 15:25:19 -08:00
fixup.c Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2009-04-01 09:47:12 -07:00
i386.c x86: Fix common misspellings 2011-03-18 10:39:30 +01:00
init.c x86, olpc: Use pci subarch init for OLPC 2010-02-25 19:26:23 -08:00
irq.c x86/PCI: irq and pci_ids patch for Intel Panther Point DeviceIDs 2011-05-10 15:43:36 -07:00
legacy.c x86/PCI: pci, fix section mismatch 2010-07-30 09:29:09 -07:00
Makefile ce4100: Add PCI register emulation for CE4100 2010-11-12 00:45:41 +01:00
mmconfig_32.c x86/PCI: Convert pci_config_lock to raw_spinlock 2010-05-11 12:01:09 -07:00
mmconfig_64.c x86/PCI: MMCONFIG: add lookup function 2009-11-24 15:30:36 -08:00
mmconfig-shared.c x66, UV: Enable 64-bit ACPI MFCG support for SGI UV2 platform 2011-06-03 16:00:03 +02:00
mrst.c x86, pci, mrst: Add extra sanity check in walking the PCI extended cap chain 2010-07-16 16:52:15 -07:00
numaq_32.c x86/PCI: config space accessor functions should not ignore the segment argument 2011-07-22 08:25:41 -07:00
olpc.c x86/PCI: config space accessor functions should not ignore the segment argument 2011-07-22 08:25:41 -07:00
pcbios.c x86/PCI: config space accessor functions should not ignore the segment argument 2011-07-22 08:25:41 -07:00
visws.c PCI: Make the struct pci_dev * argument of pci_fixup_irqs const. 2011-07-22 08:26:06 -07:00
xen.c xen/pci: Use 'acpi_gsi_to_irq' value unconditionally. 2011-07-11 13:19:34 -04:00