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| author | Keith Busch <keith.busch@intel.com> | 2016-07-21 21:40:28 -0600 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2016-07-25 12:52:47 -0500 |
| commit | e16b46605960bd071a3e26f316e0bb600ae91e37 (patch) | |
| tree | cbddd9ca52a24d2a414c48e375d89f8c36596087 /Documentation/kernel-parameters.txt | |
| parent | af8c34ce6ae32addda3788d54a7e340cad22516b (diff) | |
| download | linux-e16b46605960bd071a3e26f316e0bb600ae91e37.tar.gz linux-e16b46605960bd071a3e26f316e0bb600ae91e37.tar.bz2 linux-e16b46605960bd071a3e26f316e0bb600ae91e37.zip | |
PCI: Allow additional bus numbers for hotplug bridges
A user may hot add a switch requiring more than one bus to enumerate. This
previously required a system reboot if BIOS did not sufficiently pad the
bus resource, which they frequently don't do.
Add a kernel parameter so a user can specify the minimum number of bus
numbers to reserve for a hotplug bridge's subordinate buses so rebooting
won't be necessary.
The default is 1, which is equivalent to previous behavior.
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 82b42c958d1c..487e799b1da2 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -3016,6 +3016,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted. hpmemsize=nn[KMG] The fixed amount of bus space which is reserved for hotplug bridge's memory window. Default size is 2 megabytes. + hpbussize=nn The minimum amount of additional bus numbers + reserved for buses below a hotplug bridge. + Default is 1. realloc= Enable/disable reallocating PCI bridge resources if allocations done by BIOS are too small to accommodate resources required by all child |