linux-kernel - [PATCH V4 0/1] Intel Sky Lake-E host root ports check.

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Date:   Wed, 30 Mar 2022 17:08:22 +0300
From:   Shlomo Pongratz <shlomopongratz@...il.com>
To:     linux-pci@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, andrew.maier@...eticom.com,
        logang@...tatee.com, bhelgaas@...gle.com, jgg@...dia.com,
        helgaas@...nel.org, Shlomo Pongratz <shlomop@...ops.com>
Subject: [PATCH V4 0/1] Intel Sky Lake-E host root ports check. 

Changes in v4: 

Address Bjorn Helgaas and Jason Gunthorpe comments.
Replace the implementation of pci_is_root_port with a simple check
pci_pcie_type(root) != PCI_EXP_TYPE_ROOT_PORT and remove the added
IS_ROOT_PORT flag.
Update patch text.

Changes in v3: 

Use Jason Gunthorpe suggestion, that is add a flag 'IS_ROOT_PORT'
instead of 'port' and then just ignore the slot number entirely for root ports. 

Changes in v2: 

Change comment and description based on Logan Gunthorpe comments.

v1:

In commit 7b94b53db34f ("PCI/P2PDMA: Add Intel Sky Lake-E Root Ports B, C, D to
the whitelist")
Andrew Maier added the Sky Lake-E additional devices
2031, 2032 and 2033 root ports to the already existing 2030 device.

The Intel devices 2030, 2031, 2032 and 2033 which are root ports A, B, C and D,
respectively and if all exist they will occupy slots 0 till 3 in that order.

The original code handled only the case where the devices in the whiltlist are 
host bridges and assumed that they will be found on slot 0.

This assumption doesn't hold for root ports so an explicit test was added to
cover this case.

Shlomo Pongratz (1):
  Intel Sky Lake-E host root ports check.

 drivers/pci/p2pdma.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

-- 
2.17.1