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| author | Bjorn Helgaas <bhelgaas@google.com> | 2024-07-19 10:10:21 -0500 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2024-07-19 10:10:21 -0500 |
| commit | cb43487e5dc3efddc14c66938138b5908789be59 (patch) | |
| tree | 82530553e162f085363a8f0b668dcf345a1baa41 /Documentation | |
| parent | 1613e604df0cd359cf2a7fbd9be7a0bcfacfabd0 (diff) | |
| parent | 47c8846a49baa8c0b7a6a3e7e7eacd6e8d119d25 (diff) | |
| download | linux-cb43487e5dc3efddc14c66938138b5908789be59.tar.gz linux-cb43487e5dc3efddc14c66938138b5908789be59.tar.bz2 linux-cb43487e5dc3efddc14c66938138b5908789be59.zip | |
Merge branch 'pci/acs'
- Add ACS quirk for Broadcom BCM5760X NIC, which doesn't allow peer-to-peer
transactions between functions, but doesn't advertise ACS support (Ajit
Khaparde)
- Add "pci=config_acs=" kernel command-line parameter to relax default ACS
settings to enable peer-to-peer configurations. Requires expert
knowledge of topology and ACS operation (Vidya Sagar)
* pci/acs:
PCI: Extend ACS configurability
PCI: Add ACS quirk for Broadcom BCM5760X NIC
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 500cfa776225..b2057241ea6c 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -4619,6 +4619,38 @@ bridges without forcing it upstream. Note: this removes isolation between devices and may put more devices in an IOMMU group. + config_acs= + Format: + <ACS flags>@<pci_dev>[; ...] + Specify one or more PCI devices (in the format + specified above) optionally prepended with flags + and separated by semicolons. The respective + capabilities will be enabled, disabled or + unchanged based on what is specified in + flags. + + ACS Flags is defined as follows: + bit-0 : ACS Source Validation + bit-1 : ACS Translation Blocking + bit-2 : ACS P2P Request Redirect + bit-3 : ACS P2P Completion Redirect + bit-4 : ACS Upstream Forwarding + bit-5 : ACS P2P Egress Control + bit-6 : ACS Direct Translated P2P + Each bit can be marked as: + '0' – force disabled + '1' – force enabled + 'x' – unchanged + For example, + pci=config_acs=10x + would configure all devices that support + ACS to enable P2P Request Redirect, disable + Translation Blocking, and leave Source + Validation unchanged from whatever power-up + or firmware set it to. + + Note: this may remove isolation between devices + and may put more devices in an IOMMU group. force_floating [S390] Force usage of floating interrupts. nomio [S390] Do not use MIO instructions. norid [S390] ignore the RID field and force use of |