PCI: Document hpiosize= and hpmemsize= resource reservation parameters

Document PCI hotplug resource reservation parameters hpiosize and
hpmemsize.  These parameters override default hotplug I/O size (256 bytes)
and default mem size (2M).

Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 363e348..69f97a8 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2248,6 +2248,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                                the default.
                                off: Turn ECRC off
                                on: Turn ECRC on.
+               hpiosize=nn[KMG]        The fixed amount of bus space which is
+                               reserved for hotplug bridge's IO window.
+                               Default size is 256 bytes.
+               hpmemsize=nn[KMG]       The fixed amount of bus space which is
+                               reserved for hotplug bridge's memory window.
+                               Default size is 2 megabytes.
                realloc=        Enable/disable reallocating PCI bridge resources
                                if allocations done by BIOS are too small to
                                accommodate resources required by all child