netdev - [PATCH V7 0/9] PCI: Enable 10-Bit tag support for PCIe devices

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Date:   Wed, 4 Aug 2021 21:46:59 +0800
From:   Dongdong Liu <liudongdong3@...wei.com>
To:     <helgaas@...nel.org>, <hch@...radead.org>, <kw@...ux.com>,
        <logang@...tatee.com>, <leon@...nel.org>,
        <linux-pci@...r.kernel.org>, <rajur@...lsio.com>,
        <hverkuil-cisco@...all.nl>
CC:     <linux-media@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: [PATCH V7 0/9] PCI: Enable 10-Bit tag support for PCIe devices

10-Bit Tag capability, introduced in PCIe-4.0 increases the total Tag
field size from 8 bits to 10 bits.

This patchset is to enable 10-Bit tag for PCIe EP devices (include VF) and
RP device.

V6->V7:
- Rebased on v5.14-rc3.
- Change the "pci=disable_10bit_tag=" parameter to sysfs file to disable
  10-Bit Tag Requester when need for p2pdma suggested by Leon.
- Fix comment for p2pdma 10-bit tag check.

V5->V6:
- Rebased on v5.14-rc2.
- Add Reviewed-by: Christoph Hellwig <hch@....de> in [PATCH V6 2/8].
- PCI: Add "pci=disable_10bit_tag=" parameter for peer-to-peer support.
- Add a 10-bit tag check in P2PDMA.
- Simplified implementation in [PATCH V6 6/8].
- Fix some comments in [PATCH V6 4/8].

V4->V5:
- Fix warning variable 'capa' is uninitialized.
- Fix warning unused variable 'pchild'.

V3->V4:
- Get the value of pcie_devcap2 in set_pcie_port_type().
- Add Reviewed-by: Christoph Hellwig <hch@....de> in [PATCH V4 1/6],
  [PATCH V4 3/6], [PATCH V4 4/6], [PATCH V4 5/6].
- Fix some code style.
- Rebased on v5.13-rc6.

V2->V3:
- Use cached Device Capabilities Register suggested by Christoph.
- Fix code style to avoid > 80 char lines.
- Rename devcap2 to pcie_devcap2.

V1->V2: Fix some comments by Christoph.
- Store the devcap2 value in the pci_dev instead of reading it multiple
  times.
- Change pci_info to pci_dbg to avoid the noisy log.
- Rename ext_10bit_tag_comp_path to ext_10bit_tag.
- Fix the compile error.
- Rebased on v5.13-rc1.

Dongdong Liu (9):
  PCI: Use cached Device Capabilities Register
  PCI: Use cached Device Capabilities 2 Register
  PCI: Add 10-Bit Tag register definitions
  PCI: Enable 10-Bit Tag support for PCIe Endpoint devices
  PCI/IOV: Enable 10-Bit tag support for PCIe VF devices
  PCI: Enable 10-Bit Tag support for PCIe RP devices
  PCI/sysfs: Add a 10-Bit Tag sysfs file
  PCI/IOV: Add 10-Bit Tag sysfs files for VF devices
  PCI/P2PDMA: Add a 10-Bit Tag check in P2PDMA

 Documentation/ABI/testing/sysfs-bus-pci         | 36 ++++++++++++-
 drivers/media/pci/cobalt/cobalt-driver.c        |  5 +-
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c |  4 +-
 drivers/pci/iov.c                               | 58 +++++++++++++++++++++
 drivers/pci/p2pdma.c                            | 40 ++++++++++++++
 drivers/pci/pci-sysfs.c                         | 69 +++++++++++++++++++++++++
 drivers/pci/pci.c                               | 14 ++---
 drivers/pci/pcie/aspm.c                         | 11 ++--
 drivers/pci/pcie/portdrv_pci.c                  | 69 +++++++++++++++++++++++++
 drivers/pci/probe.c                             | 66 ++++++++++++++++++-----
 drivers/pci/quirks.c                            |  3 +-
 include/linux/pci.h                             |  5 ++
 include/uapi/linux/pci_regs.h                   |  5 ++
 13 files changed, 347 insertions(+), 38 deletions(-)

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2.7.4