linux-kernel - [RFC 3/3] docs: Document the expanded hp{io,mem}size interface

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Date:   Tue, 17 Jul 2018 15:39:47 -0600
From:   Jon Derrick <jonathan.derrick@...el.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-doc@...r.kernel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Keith Busch <keith.busch@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Sinan Kaya <okaya@...eaurora.org>,
        Logan Gunthorpe <logang@...tatree.com>,
        Stephen Bates <sbates@...thlin.com>,
        Jon Derrick <jonathan.derrick@...el.com>
Subject: [RFC 3/3] docs: Document the expanded hp{io,mem}size interface

The expanded interface allows specifying sizes on a per-device/per-bus
path granularity.

Signed-off-by: Jon Derrick <jonathan.derrick@...el.com>
---
 Documentation/admin-guide/kernel-parameters.txt | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 533ff5c..8e4c129 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -3142,11 +3142,24 @@
 				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.
+		hpiosize=
+				Format:
+				<nn[KMG]>
+				<nn[KMG]>@][<domain>:]<bus>[:<slot>.<func>][; ...]
+				<nn[KMG]>@]pci:<vendor>:<device>\
+						[:<subvendor>:<subdevice>][; ...]
+				The fixed amount of bus space which is reserved
+				for the matching hotplug bridge(s)'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.
+		hpmemsize=
+				Format:
+				<nn[KMG]>[P]
+				<nn[KMG]>[P]@][<domain>:]<bus>[:<slot>.<func>][; ...]
+				<nn[KMG]>[P]@]pci:<vendor>:<device>\
+						[:<subvendor>:<subdevice>][; ...]
+				The fixed amount of bus space which is reserved
+				for the matching hotplug bridge(s)'s memory window.
+				'P' specifies prefetchable.
 				Default size is 2 megabytes.
 		hpbussize=nn	The minimum amount of additional bus numbers
 				reserved for buses below a hotplug bridge.
-- 
1.8.3.1