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| author | Wei Huang <wei.huang2@amd.com> | 2024-10-02 11:59:50 -0500 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2024-10-02 16:20:01 -0500 |
| commit | f69767a1ada3ac74be2e1ac0795a05e1d1384eff (patch) | |
| tree | 31ffb9fecd595d98a85f7a1b5c96d45e766e6821 /Documentation/admin-guide/kernel-parameters.txt | |
| parent | 9852d85ec9d492ebef56dc5f229416c925758edc (diff) | |
| download | lwn-f69767a1ada3ac74be2e1ac0795a05e1d1384eff.tar.gz lwn-f69767a1ada3ac74be2e1ac0795a05e1d1384eff.zip | |
PCI: Add TLP Processing Hints (TPH) support
Add support for PCIe TLP Processing Hints (TPH) support (see PCIe r6.2,
sec 6.17).
Add TPH register definitions in pci_regs.h, including the TPH Requester
capability register, TPH Requester control register, TPH Completer
capability, and the ST fields of MSI-X entry.
Introduce pcie_enable_tph() and pcie_disable_tph(), enabling drivers to
toggle TPH support and configure specific ST mode as needed. Also add a new
kernel parameter, "pci=notph", allowing users to disable TPH support across
the entire system.
Link: https://lore.kernel.org/r/20241002165954.128085-2-wei.huang2@amd.com
Co-developed-by: Jing Liu <jing2.liu@intel.com>
Co-developed-by: Paul Luse <paul.e.luse@linux.intel.com>
Co-developed-by: Eric Van Tassell <Eric.VanTassell@amd.com>
Signed-off-by: Jing Liu <jing2.liu@intel.com>
Signed-off-by: Paul Luse <paul.e.luse@linux.intel.com>
Signed-off-by: Eric Van Tassell <Eric.VanTassell@amd.com>
Signed-off-by: Wei Huang <wei.huang2@amd.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Reviewed-by: Andy Gospodarek <andrew.gospodarek@broadcom.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Lukas Wunner <lukas@wunner.de>
Diffstat (limited to 'Documentation/admin-guide/kernel-parameters.txt')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 1518343bbe22..178995b07451 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -4678,6 +4678,10 @@ nomio [S390] Do not use MIO instructions. norid [S390] ignore the RID field and force use of one PCI domain per PCI function + notph [PCIE] If the PCIE_TPH kernel config parameter + is enabled, this kernel boot option can be used + to disable PCIe TLP Processing Hints support + system-wide. pcie_aspm= [PCIE] Forcibly enable or ignore PCIe Active State Power Management. |