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Date:   Thu, 21 Mar 2019 18:06:45 -0600
From:   Logan Gunthorpe <>
To:,,,,, Jon Mason <>,
        Joerg Roedel <>
Cc:     Bjorn Helgaas <>,
        Allen Hubbe <>,
        Dave Jiang <>,
        Serge Semin <>,
        Eric Pilmore <>,
        Logan Gunthorpe <>
Subject: [PATCH v3 10/10] NTB: Describe the ntb_msi_test client in the documentation.

Add a blurb in Documentation/ntb.txt to describe the ntb_msi_test tool's
debugfs interface. Similar to the (out of date) ntb_tool description.

Signed-off-by: Logan Gunthorpe <>
 Documentation/ntb.txt | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/Documentation/ntb.txt b/Documentation/ntb.txt
index a043854d28df..802a539f1592 100644
--- a/Documentation/ntb.txt
+++ b/Documentation/ntb.txt
@@ -194,6 +194,33 @@ Debugfs Files:
 	This file is used to read and write peer scratchpads.  See
 	*spad* for details.
+NTB MSI Test Client (ntb\_msi\_test)
+The MSI test client serves to test and debug the MSI library which
+allows for passing MSI interrupts across NTB memory windows. The
+test client is interacted with through the debugfs filesystem:
+* *debugfs*/ntb\_tool/*hw*/
+	A directory in debugfs will be created for each
+	NTB device probed by the tool.  This directory is shortened to *hw*
+	below.
+* *hw*/port
+	This file describes the local port number
+* *hw*/irq*_occurrences
+	One occurrences file exists for each interrupt and, when read,
+	returns the number of times the interrupt has been triggered.
+* *hw*/peer*/port
+	This file describes the port number for each peer
+* *hw*/peer*/count
+	This file describes the number of interrupts that can be
+	triggered on each peer
+* *hw*/peer*/trigger
+	Writing an interrupt number (any number less than the value
+	specified in count) will trigger the interrupt on the
+	specified peer. That peer's interrupt's occurrence file
+	should be incremented.
 NTB Hardware Drivers

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