Adding documentation

Adding documentation, component- and sequence diagrams how the driver library and kernel driver work. Change-Id: I4e71b5e1f5d926386efe8f103a0f4fbc8636a494
author: Kristofer Jonsson <kristofer.jonsson@arm.com> 2021-06-02 17:15:57 +0200
committer: Kristofer Jonsson <kristofer.jonsson@arm.com> 2021-06-10 11:35:45 +0200
commit: 0c79f896caf1a0ac16dd92810c4b15bfff00bdb3 (patch)
tree: d831c0a297894065865ecd680a4ccaeb67859d39
parent: 2c01713dbeba8446b135ef19fc443b6abe098210 (diff)
download: ethos-u-linux-driver-stack-0c79f896caf1a0ac16dd92810c4b15bfff00bdb3.tar.gz
11 files changed, 712 insertions, 1 deletions
diff --git a/README.md b/README.md
index da279b3..c46e1fe 100644
--- a/README.md
+++ b/README.md
@@ -66,6 +66,114 @@ The kernel driver uses the mailbox APIs as a doorbell mechanism.
 };
 ```
 
+# Documentation
+
+## Driver library
+
+The purpose of the driver library is to provide user friendly C++ APIs for
+dispatching inferences to the Ethos-U kernel driver.
+
+As the component diagram below illustrates the network is separated from the
+inference, allowing multiple inferences to share the same network. The buffer
+class is used to store any data.
+
+![Driver library](docs/driver_library_component.svg "Driver library component diagram")
+
+The [inference runner](utils/inference_runner/inference_runner.cpp) demonstrates
+how to dispatch inferences to the Ethos-U kernel driver. All the steps described
+in the sequence diagram below are executed by the `inference_runner`
+application.
+
+The `Device` class opens a file descriptor to the device node `/dev/ethosu<nr>`.
+This file descriptor is used to issue IOCTL request to kernel space to create
+buffers and networks.
+
+The `Network` class uses the `Device` object to create a new network object. The
+network model is stored in a `Buffer` that the network parses to discover the
+dimensions of the network model.
+
+The `Inference` class uses the `Network` object to create an inference. The
+array of IFM `Buffers` need to be populated with data before the inference
+object is created.
+
+The inference object must poll the file descriptor waiting for the inference to
+complete.
+
+![Driver library](docs/driver_library_sequence.svg "Driver library sequence diagram")
+
+## Ethos-U core interface
+
+The task of the Ethos-U kernel driver is to present a Userspace API (UAPI) to
+user space, and to communicate with the Cortex-M in the Ethos-U subsystem.
+
+The communication with the Ethos-U subsystem is based on message passing in
+shared memory, and the Linux kernel mailbox APIs for triggering IRQs on the
+remote CPU.
+
+The address of the message queues is hard coded in the Cortex-M application, and
+configured in the DTB for the kernel driver.
+
+When the kernel driver allocates dynamic memory for the Ethos-U subsystem it
+must be able to map a physical address to a bus address. The DTB contains a
+`dma-ranges` which define how to remap physical addresses to the Cortex-M
+address space.
+
+Triggering IRQs on a remote CPU requires external hardware support, for example
+the Arm MHU.
+
+### Device and buffer
+
+The device driver creates a device node at `/dev/ethosu<nr>` that a user space
+application can open and issues IOCTL requests to. This is how buffers and
+networks are created.
+
+Creating a new buffer returns another file descriptor that can be memory mapped
+for reading and/or writing.
+
+![Create buffer](docs/kernel_buffer.svg "Create buffer")
+
+### Network
+
+Creating a network assumes that the device node has already been opened, and
+that a buffer has been allocated and populated with the network model.
+
+A new network is created by issuing an IOCTL command on the device node file
+descriptor. A file descriptor to a buffer - containing the network model - is
+passed in the IOCTL data. The network class increases the reference count on the
+buffer, preventing the buffer from being freed before the network object has
+been destructed.
+
+![Create network](docs/kernel_network.svg "Create network")
+
+### Inference
+
+Creating an inference assumes that a network has already been created, IFM
+buffers have been allocated and populated with data, and OFM buffers have been
+allocated.
+
+A new inference is created by issuing an IOCTL command to the network file
+descriptor. An array of IFM and OFM buffers are passed in the IOCTL data, which
+reference counts will be increased.
+
+Immediately after the inference object has been created an *inference request*
+message is sent to the Cortex-M application. The inference request message is
+written to a ring buffer in shared memory, cache maintenance is executed if
+necessary, and an IRQ is raised using the Linux mailbox APIs.
+
+On success, a valid file handle is returned to user space. The file handle is
+used to wait for the inference to complete.
+
+Once the inference has been calculated on the Ethos-U subsystem, the message
+process writes an *inference response* message into the response queue in shared
+memory, executes cache maintenance if needed, and raises an IRQ.
+
+On the Linux side the IRQ is handled and cleared. The IRQ bottom handler is a
+separate kernel thread responsible for reading the message queue. When the
+inference response message is received it updates the status of the inference
+and unblocks any waiting user space processes.
+
+![Run inference](docs/kernel_inference.svg "Run inference")
+
 # Licenses
 
 The kernel drivers are provided under a GPL v2 license. All other software
@@ -95,7 +203,7 @@ Date:   Mon Feb 29 12:12:12 2016 +0000
 Title of the commit
 
 Short description of the change.
-   
+
 Signed-off-by: John Doe john.doe@example.org
 Signed-off-by: Foo Bar foo.bar@example.org
 ```
diff --git a/docs/driver_library_component.puml b/docs/driver_library_component.puml
new file mode 100644
index 0000000..1b640e2
--- /dev/null
+++ b/docs/driver_library_component.puml
@@ -0,0 +1,18 @@
+@startuml
+
+skinparam backgroundColor #FEFEFE
+
+[Inference] as inf
+[Network] as net
+[Buffer] as buf
+[Device] as dev
+
+inf -> net
+inf -> buf: IFM and OFM
+
+net --> dev
+net --> buf: Network model
+
+buf -> dev
+
+@enduml
+\ No newline at end of file
diff --git a/docs/driver_library_component.svg b/docs/driver_library_component.svg
new file mode 100644
index 0000000..bcb43f9
--- /dev/null
+++ b/docs/driver_library_component.svg
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" contentScriptType="application/ecmascript" contentStyleType="text/css" height="168px" preserveAspectRatio="none" style="width:322px;height:168px;background:#FEFEFE;" version="1.1" viewBox="0 0 322 168" width="322px" zoomAndPan="magnify"><defs><filter height="300%" id="f1cgoct9zpmo59" width="300%" x="-1" y="-1"><feGaussianBlur result="blurOut" stdDeviation="2.0"/><feColorMatrix in="blurOut" result="blurOut2" type="matrix" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .4 0"/><feOffset dx="4.0" dy="4.0" in="blurOut2" result="blurOut3"/><feBlend in="SourceGraphic" in2="blurOut3" mode="normal"/></filter></defs><g><!--entity inf--><rect fill="#FEFECE" filter="url(#f1cgoct9zpmo59)" height="36.2969" style="stroke: #A80036; stroke-width: 1.5;" width="85" x="6" y="8"/><rect fill="#FEFECE" height="5" style="stroke: #A80036; stroke-width: 1.5;" width="10" x="1" y="13"/><rect fill="#FEFECE" height="5" style="stroke: #A80036; stroke-width: 1.5;" width="10" x="1" y="34.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="65" x="16" y="30.9951">Inference</text><!--entity net--><rect fill="#FEFECE" filter="url(#f1cgoct9zpmo59)" height="36.2969" style="stroke: #A80036; stroke-width: 1.5;" width="77" x="129" y="8"/><rect fill="#FEFECE" height="5" style="stroke: #A80036; stroke-width: 1.5;" width="10" x="124" y="13"/><rect fill="#FEFECE" height="5" style="stroke: #A80036; stroke-width: 1.5;" width="10" x="124" y="34.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="57" x="139" y="30.9951">Network</text><!--entity buf--><rect fill="#FEFECE" filter="url(#f1cgoct9zpmo59)" height="36.2969" style="stroke: #A80036; stroke-width: 1.5;" width="61" x="137" y="121"/><rect fill="#FEFECE" height="5" style="stroke: #A80036; stroke-width: 1.5;" width="10" x="132" y="126"/><rect fill="#FEFECE" height="5" style="stroke: #A80036; stroke-width: 1.5;" width="10" x="132" y="147.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="41" x="147" y="143.9951">Buffer</text><!--entity dev--><rect fill="#FEFECE" filter="url(#f1cgoct9zpmo59)" height="36.2969" style="stroke: #A80036; stroke-width: 1.5;" width="67" x="244" y="121"/><rect fill="#FEFECE" height="5" style="stroke: #A80036; stroke-width: 1.5;" width="10" x="239" y="126"/><rect fill="#FEFECE" height="5" style="stroke: #A80036; stroke-width: 1.5;" width="10" x="239" y="147.2969"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="47" x="254" y="143.9951">Device</text><!--link inf to net--><path d="M91.2656,26 C102.014,26 112.7624,26 123.5108,26 " fill="none" id="inf-net" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="128.7872,26,119.7872,22,123.7872,26,119.7872,30,128.7872,26" style="stroke: #A80036; stroke-width: 1.0;"/><!--link inf to buf--><path d="M51.77,44.1326 C55.1308,58.3191 61.6089,77.7906 73.5,91 C89.0965,108.3256 112.4057,120.2854 131.9103,127.9336 " fill="none" id="inf-buf" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="136.7801,129.7858,129.7901,122.8475,132.1067,128.0083,126.946,130.3249,136.7801,129.7858" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="81" x="74.5" y="87.0669">IFM and OFM</text><!--link net to dev--><path d="M206.4926,35.4978 C227.4666,42.6282 251.9451,54.5931 266.5,74 C275.351,85.8015 278.0778,102.1963 278.6036,115.5676 " fill="none" id="net-dev" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="278.7058,120.7148,282.5263,111.6371,278.6065,115.7158,274.5279,111.796,278.7058,120.7148" style="stroke: #A80036; stroke-width: 1.0;"/><!--link net to buf--><path d="M166.0926,44.2219 C165.4689,53.1847 164.8074,64.1523 164.5,74 C164.0682,87.8318 164.7366,103.3096 165.5511,115.691 " fill="none" id="net-buf" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="165.9063,120.794,169.2715,111.5379,165.559,115.8061,161.2909,112.0936,165.9063,120.794" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="96" x="165.5" y="87.0669">Network model</text><!--link buf to dev--><path d="M198.0078,139 C211.6511,139 225.2944,139 238.9377,139 " fill="none" id="buf-dev" style="stroke: #A80036; stroke-width: 1.0;"/><polygon fill="#A80036" points="243.9642,139,234.9642,135,238.9642,139,234.9642,143,243.9642,139" style="stroke: #A80036; stroke-width: 1.0;"/><!--
+@startuml
+
+skinparam backgroundColor #FEFEFE
+
+[Inference] as inf
+[Network] as net
+[Buffer] as buf
+[Device] as dev
+
+inf -> net
+inf -> buf: IFM and OFM
+
+net - -> dev
+net - -> buf: Network model
+
+buf -> dev
+
+@enduml
+
+PlantUML version 1.2017.15(Mon Jul 03 18:45:34 CEST 2017)
+(GPL source distribution)
+Java Runtime: OpenJDK Runtime Environment
+JVM: OpenJDK 64-Bit Server VM
+Java Version: 11.0.11+9-Ubuntu-0ubuntu2.18.04
+Operating System: Linux
+OS Version: 5.4.0-73-generic
+Default Encoding: UTF-8
+Language: en
+Country: US
+--></g></svg>
+\ No newline at end of file
diff --git a/docs/driver_library_sequence.puml b/docs/driver_library_sequence.puml
new file mode 100644
index 0000000..adac2f9
--- /dev/null
+++ b/docs/driver_library_sequence.puml
@@ -0,0 +1,79 @@
+@startuml
+
+skinparam backgroundColor #FEFEFE
+
+box "Application" #0091BD
+participant "main()" as main
+end box
+
+box "Driver library" #00C1DE
+participant "Device" as ddev
+participant "Buffer" as dbuf
+participant "Network" as dnet
+participant "Inference" as dinf
+end box
+
+box "Kernel driver" #7D868C
+participant "Device" as kdev
+participant "Buffer" as kbuf
+participant "Network" as knet
+participant "Inference" as kinf
+end box
+
+note over ddev
+    Create device
+end note
+activate main
+main -> ddev++: Device()
+    ddev -> kdev++: open(<device node>)
+    return file descriptor
+return
+
+note over dnet
+    Allocate and fill network buffer
+end note
+
+main -> dbuf++: Buffer(device)
+    dbuf -> kbuf++: ioctl(BUFFER_CREATE)
+    return file descriptor
+return
+
+note over dnet
+    Create network, parse network model
+end note
+
+main -> dnet++: Network(device, buffer)
+    dnet -> knet++: ioctl(NETWORK_CREATE)
+    return file descriptor
+
+    dnet -> dnet: Parse network model
+return
+
+loop Allocate and fill IFM buffers
+    main -> dbuf++: Buffer(device)
+        dbuf -> kbuf++: ioctl(BUFFER_CREATE)
+        return file descriptor
+    return
+end loop
+
+loop Allocate OFM buffers
+    main -> dbuf++: Buffer(device)
+        dbuf -> kbuf++: ioctl(BUFFER_CREATE)
+        return file descriptor
+    return
+end loop
+
+note over dinf
+    Create and run inference
+end note
+main -> dinf++: Inference(network, ifm, ofm)
+    dinf -> kinf++: ioctl(INFERENCE_CREATE)
+    return file descriptor
+return
+
+main -> dinf++: wait(file descriptor)
+    dinf -> kinf++: poll(file descriptor)
+    return
+return
+
+@enduml
diff --git a/docs/driver_library_sequence.svg b/docs/driver_library_sequence.svg
new file mode 100644
index 0000000..1103a05
--- /dev/null
+++ b/docs/driver_library_sequence.svg
@@ -0,0 +1,92 @@
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+@startuml
+
+skinparam backgroundColor #FEFEFE
+
+box "Application" #0091BD
+participant "main()" as main
+end box
+
+box "Driver library" #00C1DE
+participant "Device" as ddev
+participant "Buffer" as dbuf
+participant "Network" as dnet
+participant "Inference" as dinf
+end box
+
+box "Kernel driver" #7D868C
+participant "Device" as kdev
+participant "Buffer" as kbuf
+participant "Network" as knet
+participant "Inference" as kinf
+end box
+
+note over ddev
+    Create device
+end note
+activate main
+main -> ddev++: Device()
+    ddev -> kdev++: open(<device node>)
+    return file descriptor
+return
+
+note over dnet
+    Allocate and fill network buffer
+end note
+
+main -> dbuf++: Buffer(device)
+    dbuf -> kbuf++: ioctl(BUFFER_CREATE)
+    return file descriptor
+return
+
+note over dnet
+    Create network, parse network model
+end note
+
+main -> dnet++: Network(device, buffer)
+    dnet -> knet++: ioctl(NETWORK_CREATE)
+    return file descriptor
+
+    dnet -> dnet: Parse network model
+return
+
+loop Allocate and fill IFM buffers
+    main -> dbuf++: Buffer(device)
+        dbuf -> kbuf++: ioctl(BUFFER_CREATE)
+        return file descriptor
+    return
+end loop
+
+loop Allocate OFM buffers
+    main -> dbuf++: Buffer(device)
+        dbuf -> kbuf++: ioctl(BUFFER_CREATE)
+        return file descriptor
+    return
+end loop
+
+note over dinf
+    Create and run inference
+end note
+main -> dinf++: Inference(network, ifm, ofm)
+    dinf -> kinf++: ioctl(INFERENCE_CREATE)
+    return file descriptor
+return
+
+main -> dinf++: wait(file descriptor)
+    dinf -> kinf++: poll(file descriptor)
+    return
+return
+
+@enduml
+
+PlantUML version 1.2017.15(Mon Jul 03 18:45:34 CEST 2017)
+(GPL source distribution)
+Java Runtime: OpenJDK Runtime Environment
+JVM: OpenJDK 64-Bit Server VM
+Java Version: 11.0.11+9-Ubuntu-0ubuntu2.18.04
+Operating System: Linux
+OS Version: 5.4.0-73-generic
+Default Encoding: UTF-8
+Language: en
+Country: US
+--></g></svg>
+\ No newline at end of file
diff --git a/docs/kernel_buffer.puml b/docs/kernel_buffer.puml
new file mode 100644
index 0000000..dc2c744
--- /dev/null
+++ b/docs/kernel_buffer.puml
@@ -0,0 +1,52 @@
+@startuml
+
+skinparam backgroundColor #FEFEFE
+
+box "Application" #0091BD
+participant "main()" as main
+end box
+
+box "Driver library" #00C1DE
+participant "Device" as ddev
+participant "Buffer" as dbuf
+participant "Network" as dnet
+participant "Inference" as dinf
+end box
+
+box "Kernel driver" #7D868C
+participant "Device" as kdev
+participant "Buffer" as kbuf
+participant "Network" as knet
+participant "Inference" as kinf
+end box
+
+activate main
+
+main -> ddev++: Device()
+    note over kdev
+        Open device node
+    end note
+
+    ddev -> kdev++: open(<device node>)
+    return file descriptor
+return
+
+main -> dbuf++: Buffer(device)
+    dbuf -> kdev++: ioctl(BUFFER_CREATE)
+        note over kbuf
+            Create buffer and return file descriptor
+        end note
+
+        kdev -> kbuf++: create()
+        return file descriptor
+    return file descriptor
+
+    note over kbuf
+        Memory map buffer
+    end note
+
+    dbuf -> kbuf++: mmap(file descriptor)
+    return
+return
+
+@enduml
diff --git a/docs/kernel_buffer.svg b/docs/kernel_buffer.svg
new file mode 100644
index 0000000..a3b2a48
--- /dev/null
+++ b/docs/kernel_buffer.svg
@@ -0,0 +1,65 @@
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+@startuml
+
+skinparam backgroundColor #FEFEFE
+
+box "Application" #0091BD
+participant "main()" as main
+end box
+
+box "Driver library" #00C1DE
+participant "Device" as ddev
+participant "Buffer" as dbuf
+participant "Network" as dnet
+participant "Inference" as dinf
+end box
+
+box "Kernel driver" #7D868C
+participant "Device" as kdev
+participant "Buffer" as kbuf
+participant "Network" as knet
+participant "Inference" as kinf
+end box
+
+activate main
+
+main -> ddev++: Device()
+    note over kdev
+        Open device node
+    end note
+
+    ddev -> kdev++: open(<device node>)
+    return file descriptor
+return
+
+main -> dbuf++: Buffer(device)
+    dbuf -> kdev++: ioctl(BUFFER_CREATE)
+        note over kbuf
+            Create buffer and return file descriptor
+        end note
+
+        kdev -> kbuf++: create()
+        return file descriptor
+    return file descriptor
+
+    note over kbuf
+        Memory map buffer
+    end note
+
+    dbuf -> kbuf++: mmap(file descriptor)
+    return
+return
+
+@enduml
+
+PlantUML version 1.2017.15(Mon Jul 03 18:45:34 CEST 2017)
+(GPL source distribution)
+Java Runtime: OpenJDK Runtime Environment
+JVM: OpenJDK 64-Bit Server VM
+Java Version: 11.0.11+9-Ubuntu-0ubuntu2.18.04
+Operating System: Linux
+OS Version: 5.4.0-73-generic
+Default Encoding: UTF-8
+Language: en
+Country: US
+--></g></svg>
+\ No newline at end of file
diff --git a/docs/kernel_inference.puml b/docs/kernel_inference.puml
new file mode 100644
index 0000000..b521bdc
--- /dev/null
+++ b/docs/kernel_inference.puml
@@ -0,0 +1,79 @@
+@startuml
+
+skinparam backgroundColor #FEFEFE
+
+box "Application" #0091BD
+participant "main()" as main
+end box
+
+box "Driver library" #00C1DE
+participant "Device" as ddev
+participant "Buffer" as dbuf
+participant "Network" as dnet
+participant "Inference" as dinf
+end box
+
+box "Kernel driver" #7D868C
+participant "Device" as kdev
+participant "Buffer" as kbuf
+participant "Network" as knet
+participant "Inference" as kinf
+participant "Mailbox" as kmbox
+end box
+
+box "Cortex-M application" #E5ECEB
+participant "Message process" as cmsg
+end box
+
+activate main
+
+note over main
+    Create device
+    Create network
+    Allocate and fill IFM buffers
+    Allocate OFM buffers
+end note
+
+main -> dinf++: Inference(network, ifm, ofm)
+    dinf -> knet++: ioctl(INFERENCE_CREATE, network, ifm, ofm)
+        note over kinf
+            Create inference
+        end note
+
+        knet -> kinf++: create(network, ifm, ofm)
+            kinf -> kmbox++: inference()
+                note over kmbox
+                    Write inference request to queue in shared memory
+                    Send IRQ
+                end note
+
+                kmbox -> cmsg: INFERENCE_REQUEST
+            return
+        return file descriptor
+    return file descriptor
+return
+
+main -> dinf++: wait()
+    dinf -> kinf++: poll()
+
+    cmsg -> kdev++: INFERENCE_RESPONSE
+        note over kdev
+            Inference response is handled by the IRQ bottom handler thread
+            Message is read from queue in shared memory
+        end note
+
+        kdev -> kmbox++: read()
+        return
+
+        note over kinf
+            Inference response handler unlocks the polling thread
+        end note
+
+        kdev -> kinf++: inference_response()
+        return
+    deactivate cmsg
+
+    return
+return
+
+@enduml
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new file mode 100644
index 0000000..53ed8b0
--- /dev/null
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stroke-width: 1.0;" width="10" x="99.5" y="68.4297"/><rect fill="#FFFFFF" filter="url(#fhqhey4ocrvwe)" height="296.3281" style="stroke: #A80036; stroke-width: 1.0;" width="10" x="420.5" y="173.9609"/><rect fill="#FFFFFF" filter="url(#fhqhey4ocrvwe)" height="266.0625" style="stroke: #A80036; stroke-width: 1.0;" width="10" x="420.5" y="499.2891"/><rect fill="#FFFFFF" filter="url(#fhqhey4ocrvwe)" height="216.7969" style="stroke: #A80036; stroke-width: 1.0;" width="10" x="504.5" y="557.5547"/><rect fill="#FFFFFF" filter="url(#fhqhey4ocrvwe)" height="253.0625" style="stroke: #A80036; stroke-width: 1.0;" width="10" x="731.5" y="203.0938"/><rect fill="#FFFFFF" filter="url(#fhqhey4ocrvwe)" height="155.6641" style="stroke: #A80036; stroke-width: 1.0;" width="10" x="922.5" y="271.3594"/><rect fill="#FFFFFF" filter="url(#fhqhey4ocrvwe)" height="222.9297" style="stroke: #A80036; stroke-width: 1.0;" width="10" x="922.5" y="528.4219"/><rect fill="#FFFFFF" filter="url(#fhqhey4ocrvwe)" height="14.1328" style="stroke: #A80036; stroke-width: 1.0;" width="10" x="927.5" y="723.2188"/><rect fill="#FFFFFF" filter="url(#fhqhey4ocrvwe)" height="97.5313" style="stroke: #A80036; stroke-width: 1.0;" width="10" x="1020.5" y="300.4922"/><rect fill="#FFFFFF" filter="url(#fhqhey4ocrvwe)" height="14.1328" style="stroke: #A80036; stroke-width: 1.0;" width="10" x="1020.5" y="640.9531"/><polygon fill="#FBFB77" filter="url(#fhqhey4ocrvwe)" points="8,73.4297,8,143.4297,198,143.4297,198,83.4297,188,73.4297,8,73.4297" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="188" x2="188" y1="73.4297" y2="83.4297"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="198" x2="188" y1="83.4297" y2="83.4297"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="88" x="14" y="90.4966">Create device</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="97" x="14" y="105.6294">Create network</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="169" x="14" y="120.7622">Allocate and fill IFM buffers</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="131" x="14" y="135.895">Allocate OFM buffers</text><polygon fill="#A80036" points="408.5,169.9609,418.5,173.9609,408.5,177.9609,412.5,173.9609" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="109.5" x2="414.5" y1="173.9609" y2="173.9609"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="180" x="116.5" y="169.0278">Inference(network, ifm, ofm)</text><polygon fill="#A80036" points="719.5,199.0938,729.5,203.0938,719.5,207.0938,723.5,203.0938" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="430.5" x2="725.5" y1="203.0938" y2="203.0938"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="282" x="437.5" y="198.1606">ioctl(INFERENCE_CREATE, network, ifm, ofm)</text><polygon fill="#FBFB77" filter="url(#fhqhey4ocrvwe)" points="862,216.2266,862,241.2266,989,241.2266,989,226.2266,979,216.2266,862,216.2266" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="979" x2="979" y1="216.2266" y2="226.2266"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="989" x2="979" y1="226.2266" y2="226.2266"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="106" x="868" y="233.2935">Create inference</text><polygon fill="#A80036" points="910.5,267.3594,920.5,271.3594,910.5,275.3594,914.5,271.3594" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="741.5" x2="916.5" y1="271.3594" y2="271.3594"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="162" x="748.5" y="266.4263">create(network, ifm, ofm)</text><polygon fill="#A80036" points="1008.5,296.4922,1018.5,300.4922,1008.5,304.4922,1012.5,300.4922" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="932.5" x2="1014.5" y1="300.4922" y2="300.4922"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="69" x="939.5" y="295.5591">inference()</text><polygon fill="#FBFB77" filter="url(#fhqhey4ocrvwe)" points="848,313.625,848,353.625,1199,353.625,1199,323.625,1189,313.625,848,313.625" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="1189" x2="1189" y1="313.625" y2="323.625"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="1199" x2="1189" y1="323.625" y2="323.625"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="330" x="854" y="330.6919">Write inference request to queue in shared memory</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="58" x="854" y="345.8247">Send IRQ</text><polygon fill="#A80036" points="1185.5,379.8906,1195.5,383.8906,1185.5,387.8906,1189.5,383.8906" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="1030.5" x2="1191.5" y1="383.8906" y2="383.8906"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="138" x="1037.5" y="378.9575">INFERENCE_REQUEST</text><polygon fill="#A80036" points="943.5,394.0234,933.5,398.0234,943.5,402.0234,939.5,398.0234" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0; stroke-dasharray: 2.0,2.0;" x1="937.5" x2="1024.5" y1="398.0234" y2="398.0234"/><polygon fill="#A80036" points="752.5,423.0234,742.5,427.0234,752.5,431.0234,748.5,427.0234" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0; stroke-dasharray: 2.0,2.0;" x1="746.5" x2="926.5" y1="427.0234" y2="427.0234"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="86" x="758.5" y="422.0903">file descriptor</text><polygon fill="#A80036" points="441.5,452.1563,431.5,456.1563,441.5,460.1563,437.5,456.1563" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0; stroke-dasharray: 2.0,2.0;" x1="435.5" x2="735.5" y1="456.1563" y2="456.1563"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="86" x="447.5" y="451.2231">file descriptor</text><polygon fill="#A80036" points="120.5,466.2891,110.5,470.2891,120.5,474.2891,116.5,470.2891" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0; stroke-dasharray: 2.0,2.0;" x1="114.5" x2="424.5" y1="470.2891" y2="470.2891"/><polygon fill="#A80036" points="408.5,495.2891,418.5,499.2891,408.5,503.2891,412.5,499.2891" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="109.5" x2="414.5" y1="499.2891" y2="499.2891"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="35" x="116.5" y="494.356">wait()</text><polygon fill="#A80036" points="910.5,524.4219,920.5,528.4219,910.5,532.4219,914.5,528.4219" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="430.5" x2="916.5" y1="528.4219" y2="528.4219"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="32" x="437.5" y="523.4888">poll()</text><polygon fill="#A80036" points="525.5,553.5547,515.5,557.5547,525.5,561.5547,521.5,557.5547" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="519.5" x2="1196.5" y1="557.5547" y2="557.5547"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="148" x="531.5" y="552.6216">INFERENCE_RESPONSE</text><polygon fill="#FBFB77" filter="url(#fhqhey4ocrvwe)" points="292,570.6875,292,610.6875,722,610.6875,722,580.6875,712,570.6875,292,570.6875" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="712" x2="712" y1="570.6875" y2="580.6875"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="722" x2="712" y1="580.6875" y2="580.6875"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="409" x="298" y="587.7544">Inference response is handled by the IRQ bottom handler thread</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="303" x="298" y="602.8872">Message is read from queue in shared memory</text><polygon fill="#A80036" points="1008.5,636.9531,1018.5,640.9531,1008.5,644.9531,1012.5,640.9531" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="514.5" x2="1014.5" y1="640.9531" y2="640.9531"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="39" x="521.5" y="636.02">read()</text><polygon fill="#A80036" points="525.5,651.0859,515.5,655.0859,525.5,659.0859,521.5,655.0859" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0; stroke-dasharray: 2.0,2.0;" x1="519.5" x2="1024.5" y1="655.0859" y2="655.0859"/><polygon fill="#FBFB77" filter="url(#fhqhey4ocrvwe)" points="744,668.0859,744,693.0859,1107,693.0859,1107,678.0859,1097,668.0859,744,668.0859" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="1097" x2="1097" y1="668.0859" y2="678.0859"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="1107" x2="1097" y1="678.0859" y2="678.0859"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="342" x="750" y="685.1528">Inference response handler unlocks the polling thread</text><polygon fill="#A80036" points="915.5,719.2188,925.5,723.2188,915.5,727.2188,919.5,723.2188" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="514.5" x2="921.5" y1="723.2188" y2="723.2188"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="135" x="521.5" y="718.2856">inference_response()</text><polygon fill="#A80036" points="525.5,733.3516,515.5,737.3516,525.5,741.3516,521.5,737.3516" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0; stroke-dasharray: 2.0,2.0;" x1="519.5" x2="921.5" y1="737.3516" y2="737.3516"/><polygon fill="#A80036" points="441.5,747.3516,431.5,751.3516,441.5,755.3516,437.5,751.3516" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0; stroke-dasharray: 2.0,2.0;" x1="435.5" x2="926.5" y1="751.3516" y2="751.3516"/><polygon fill="#A80036" points="120.5,761.3516,110.5,765.3516,120.5,769.3516,116.5,765.3516" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0; stroke-dasharray: 2.0,2.0;" x1="114.5" x2="424.5" y1="765.3516" y2="765.3516"/><!--
+@startuml
+
+skinparam backgroundColor #FEFEFE
+
+box "Application" #0091BD
+participant "main()" as main
+end box
+
+box "Driver library" #00C1DE
+participant "Device" as ddev
+participant "Buffer" as dbuf
+participant "Network" as dnet
+participant "Inference" as dinf
+end box
+
+box "Kernel driver" #7D868C
+participant "Device" as kdev
+participant "Buffer" as kbuf
+participant "Network" as knet
+participant "Inference" as kinf
+participant "Mailbox" as kmbox
+end box
+
+box "Cortex-M application" #E5ECEB
+participant "Message process" as cmsg
+end box
+
+activate main
+
+note over main
+    Create device
+    Create network
+    Allocate and fill IFM buffers
+    Allocate OFM buffers
+end note
+
+main -> dinf++: Inference(network, ifm, ofm)
+    dinf -> knet++: ioctl(INFERENCE_CREATE, network, ifm, ofm)
+        note over kinf
+            Create inference
+        end note
+
+        knet -> kinf++: create(network, ifm, ofm)
+            kinf -> kmbox++: inference()
+                note over kmbox
+                    Write inference request to queue in shared memory
+                    Send IRQ
+                end note
+
+                kmbox -> cmsg: INFERENCE_REQUEST
+            return
+        return file descriptor
+    return file descriptor
+return
+
+main -> dinf++: wait()
+    dinf -> kinf++: poll()
+
+    cmsg -> kdev++: INFERENCE_RESPONSE
+        note over kdev
+            Inference response is handled by the IRQ bottom handler thread
+            Message is read from queue in shared memory
+        end note
+
+        kdev -> kmbox++: read()
+        return
+
+        note over kinf
+            Inference response handler unlocks the polling thread
+        end note
+
+        kdev -> kinf++: inference_response()
+        return
+    deactivate cmsg
+
+    return
+return
+
+@enduml
+
+PlantUML version 1.2017.15(Mon Jul 03 18:45:34 CEST 2017)
+(GPL source distribution)
+Java Runtime: OpenJDK Runtime Environment
+JVM: OpenJDK 64-Bit Server VM
+Java Version: 11.0.11+9-Ubuntu-0ubuntu2.18.04
+Operating System: Linux
+OS Version: 5.4.0-73-generic
+Default Encoding: UTF-8
+Language: en
+Country: US
+--></g></svg>
+\ No newline at end of file
diff --git a/docs/kernel_network.puml b/docs/kernel_network.puml
new file mode 100644
index 0000000..39c7f55
--- /dev/null
+++ b/docs/kernel_network.puml
@@ -0,0 +1,41 @@
+@startuml
+
+skinparam backgroundColor #FEFEFE
+
+box "Application" #0091BD
+participant "main()" as main
+end box
+
+box "Driver library" #00C1DE
+participant "Device" as ddev
+participant "Buffer" as dbuf
+participant "Network" as dnet
+participant "Inference" as dinf
+end box
+
+box "Kernel driver" #7D868C
+participant "Device" as kdev
+participant "Buffer" as kbuf
+participant "Network" as knet
+participant "Inference" as kinf
+end box
+
+activate main
+
+note over main
+    Create device
+    Allocate and fill network buffer
+end note
+
+main -> dnet++: Network(device, buffer)
+    dnet -> kdev++: ioctl(NETWORK_CREATE, buffer)
+        note over knet
+            Create network and return file descriptor
+        end note
+
+        kdev -> knet++: create(buffer)
+        return file descriptor
+    return file descriptor
+return
+
+@enduml
diff --git a/docs/kernel_network.svg b/docs/kernel_network.svg
new file mode 100644
index 0000000..8b3b4a3
--- /dev/null
+++ b/docs/kernel_network.svg
@@ -0,0 +1,54 @@
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+@startuml
+
+skinparam backgroundColor #FEFEFE
+
+box "Application" #0091BD
+participant "main()" as main
+end box
+
+box "Driver library" #00C1DE
+participant "Device" as ddev
+participant "Buffer" as dbuf
+participant "Network" as dnet
+participant "Inference" as dinf
+end box
+
+box "Kernel driver" #7D868C
+participant "Device" as kdev
+participant "Buffer" as kbuf
+participant "Network" as knet
+participant "Inference" as kinf
+end box
+
+activate main
+
+note over main
+    Create device
+    Allocate and fill network buffer
+end note
+
+main -> dnet++: Network(device, buffer)
+    dnet -> kdev++: ioctl(NETWORK_CREATE, buffer)
+        note over knet
+            Create network and return file descriptor
+        end note
+
+        kdev -> knet++: create(buffer)
+        return file descriptor
+    return file descriptor
+return
+
+@enduml
+
+PlantUML version 1.2017.15(Mon Jul 03 18:45:34 CEST 2017)
+(GPL source distribution)
+Java Runtime: OpenJDK Runtime Environment
+JVM: OpenJDK 64-Bit Server VM
+Java Version: 11.0.11+9-Ubuntu-0ubuntu2.18.04
+Operating System: Linux
+OS Version: 5.4.0-73-generic
+Default Encoding: UTF-8
+Language: en
+Country: US
+--></g></svg>
+\ No newline at end of file
author	Kristofer Jonsson <kristofer.jonsson@arm.com>	2021-06-02 17:15:57 +0200
committer	Kristofer Jonsson <kristofer.jonsson@arm.com>	2021-06-10 11:35:45 +0200
commit	0c79f896caf1a0ac16dd92810c4b15bfff00bdb3 (patch)
tree	d831c0a297894065865ecd680a4ccaeb67859d39
parent	2c01713dbeba8446b135ef19fc443b6abe098210 (diff)
download	ethos-u-linux-driver-stack-0c79f896caf1a0ac16dd92810c4b15bfff00bdb3.tar.gz