Remove buffer capacity, offset and resize in UAPI

The UAPI no longer supports the buffer capacity, offset and resize
functionality. Instead, the UAPI now only accepts a fixed size given at
the creation of the buffer. This change was made because the features
were not used and made the buffer handling more complicated. The user
knows how big buffers they need for their networks so they don't need
resize support or partial buffer usage support by having separate size
and capacity with an offset.

Without these features, the buffer instance no longer needs any IOCTL
call support so it has been removed. However, to still be able to check
the size of a buffer from its file descriptor, seek support has been
implemented so lseek and similar functions can be used to get the size.

The driver library's clear function that previously only reset the size
and offset values of the buffer will now clear the buffer content
instead.

These are breaking changes so the Linux kernel NPU driver version and
the driver library version have been given major version bumps. All the
tests and other applications affected by these changes have been updated
accordingly.

Change-Id: Ifc34cf04724a95853ad23fd7398dd286f73bcdab
Signed-off-by: Mikael Olsson <mikael.olsson@arm.com>

1 files changed, 5 insertions, 9 deletions

diff --git a/driver_library/include/ethosu.hpp b/driver_library/include/ethosu.hpp
index 491dc28..47c1868 100644
--- a/driver_library/include/ethosu.hpp
+++ b/driver_library/include/ethosu.hpp
@@ -1,6 +1,5 @@
 /*
  * SPDX-FileCopyrightText: Copyright 2020-2023 Arm Limited and/or its affiliates <open-source-office@arm.com>
- *
  * SPDX-License-Identifier: Apache-2.0
  *
  * Licensed under the Apache License, Version 2.0 (the License); you may
@@ -40,12 +39,12 @@
 
 namespace EthosU {
 
-constexpr uint32_t DRIVER_LIBRARY_VERSION_MAJOR = 1;
+constexpr uint32_t DRIVER_LIBRARY_VERSION_MAJOR = 2;
 constexpr uint32_t DRIVER_LIBRARY_VERSION_MINOR = 0;
 constexpr uint32_t DRIVER_LIBRARY_VERSION_PATCH = 0;
 
-constexpr uint32_t MAX_SUPPORTED_KERNEL_DRIVER_MAJOR_VERSION = 1;
-constexpr uint32_t MIN_SUPPORTED_KERNEL_DRIVER_MAJOR_VERSION = 1;
+constexpr uint32_t MAX_SUPPORTED_KERNEL_DRIVER_MAJOR_VERSION = 2;
+constexpr uint32_t MIN_SUPPORTED_KERNEL_DRIVER_MAJOR_VERSION = 2;
 
 class Exception : public std::exception {
 public:
@@ -152,14 +151,11 @@ private:
 
 class Buffer {
 public:
-    Buffer(const Device &device, const size_t capacity);
+    Buffer(const Device &device, const size_t size);
     virtual ~Buffer() noexcept(false);
 
-    size_t capacity() const;
     void clear() const;
     char *data() const;
-    void resize(size_t size, size_t offset = 0) const;
-    size_t offset() const;
     size_t size() const;
 
     int getFd() const;
@@ -167,7 +163,7 @@ public:
 private:
     int fd;
     char *dataPtr;
-    const size_t dataCapacity;
+    const size_t dataSize;
 };
 
 class Network {