linux-kernel - [PATCH 0/5] PCI: ACS enable quirk for link balancing switches

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Date:   Wed, 26 Oct 2016 12:01:11 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     linux-pci@...r.kernel.org
Cc:     bhelgaas@...gle.com, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/5] PCI: ACS enable quirk for link balancing switches

A series exposing and extracting bits of things that the kernel
already does, culminating in an ACS enabling quirk to work around an
errata where data through a Pericom PCIe switch gets stuck when the
upstream and downstream ports are running at different link speeds and
P2P Request Redirection is enabled.

If you have a Syba SD-PEX24033 or card making use of this PCIe switch
in a similar way, and find that it doesn't work right when installed
into a 5.0GT/s+ slot and the IOMMU is enabled, you want this series.
Thanks,

Alex

---

Alex Williamson (5):
      PCI: Make pci_std_enable_acs() non-static
      PCI: Extract link speed & width retrieval from pcie_get_minimum_link()
      PCI: Extract link retraining from pcie_aspm_configure_common_clock()
      iommu: Move REQ_ACS_FLAGS out to header and rename
      PCI: Balance ports to avoid ACS errata on Pericom switches

 drivers/iommu/iommu.c   |   18 ++----
 drivers/pci/pci.c       |   57 ++++++++++++++++--
 drivers/pci/pcie/aspm.c |   17 -----
 drivers/pci/quirks.c    |  147 +++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/iommu.h   |   11 ++++
 include/linux/pci.h     |    4 +
 6 files changed, 218 insertions(+), 36 deletions(-)