[V8,0/8] PCI: Enable 10-Bit tag support for PCIe devices

Message

Dongdong Liu Aug. 18, 2021, 1:01 p.m. UTC

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).

V7->V8:
- Add a kernel parameter pcie_tag_peer2peer to disable 10-bit tags.
- Provide sysfs file to enable 10-bit tags.
- Remove [PATCH V7 6/9] PCI: Enable 10-Bit Tag support for PCIe RP devices.
- Rebased on v5.14-rc6.
- Fix some other comments. Thanks to Bjorn who gave a lot of review comments.

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 <[e-mail]> 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 <[e-mail]> 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 (8):
  PCI: Use cached Device Capabilities Register
  PCI: Use cached Device Capabilities 2 Register
  PCI: Add 10-Bit Tag register definitions
  PCI/sysfs: Add a 10-Bit Tag sysfs file PCIe Endpoint devices
  PCI/IOV: Add 10-Bit Tag sysfs files for VF devices
  PCI/P2PDMA: Add a 10-Bit Tag check in P2PDMA
  PCI: Enable 10-Bit Tag support for PCIe Endpoint device
  PCI/IOV: Enable 10-Bit Tag support for PCIe VF devices

 Documentation/ABI/testing/sysfs-bus-pci         | 41 ++++++++++++-
 Documentation/admin-guide/kernel-parameters.txt |  5 ++
 drivers/media/pci/cobalt/cobalt-driver.c        |  5 +-
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c |  4 +-
 drivers/pci/iov.c                               | 68 +++++++++++++++++++++
 drivers/pci/p2pdma.c                            | 48 +++++++++++++++
 drivers/pci/pci-sysfs.c                         | 79 +++++++++++++++++++++++++
 drivers/pci/pci.c                               | 18 +++---
 drivers/pci/pci.h                               | 10 ++++
 drivers/pci/pcie/aspm.c                         | 11 ++--
 drivers/pci/probe.c                             | 79 ++++++++++++++++++++-----
 drivers/pci/quirks.c                            |  3 +-
 include/linux/pci.h                             |  3 +
 include/uapi/linux/pci_regs.h                   |  5 ++
 14 files changed, 341 insertions(+), 38 deletions(-)

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