jtop exits with stacktrace from "GPU" tab when 3d_scaling is disabled

[subhachandrachandra]

Describe the bug

When 3d_scaling is disabled by setting GPU governor to 'performance' mode, jtop will exit with a stack trace when switched to the 'GPU' page

To Reproduce

Steps to reproduce the behavior:

1. Set GPU governor to performance mode.
   Ex. echo performance > /sys/devices/17000000.ga10b/devfreq/17000000.ga10b/governor
2. Start jtop
3. Switch to 'GPU' page by pressing '2'
4. jtop will exit with a stacktrace

Screenshots

Traceback (most recent call last):
File "/usr/local/bin/jtop", line 8, in
sys.exit(main())
File "/usr/local/lib/python3.8/dist-packages/jtop/main.py", line 160, in main
curses.wrapper(JTOPGUI, jetson, pages, init_page=args.page,
File "/usr/lib/python3.8/curses/init.py", line 105, in wrapper
return func(stdscr, *args, **kwds)
File "/usr/local/lib/python3.8/dist-packages/jtop/gui/jtopgui.py", line 100, in init
self.run(loop, seconds)
File "/usr/local/lib/python3.8/dist-packages/jtop/gui/jtopgui.py", line 129, in run
self.draw()
File "/usr/local/lib/python3.8/dist-packages/jtop/gui/jtopgui.py", line 143, in draw
page.draw(self.key, self.mouse)
File "/usr/local/lib/python3.8/dist-packages/jtop/gui/pgpu.py", line 164, in draw
scaling_string = "Active" if gpu_status['3d_scaling'] else "Disable"
KeyError: '3d_scaling'

Expected behavior

The dict in python should be accessed using 'get' in a safe manner.
Changing the 2 lines where it crashed to use 'get' like below fixes the problem.

        # 3D scaling
        scaling_string = "Active" if gpu_status.get('3d_scaling') else "Disable"
        scaling_status = NColors.green() if gpu_status.get('3d_scaling') else curses.A_NORMAL

Board

Output from jetson_release -v:
Software part of jetson-stats 4.2.6 - (c) 2024, Raffaello Bonghi
Model: Jetson AGX Orin - Jetpack 5.1 [L4T 35.2.1]
NV Power Mode[0]: MAXN
Serial Number: [XXX Show with: jetson_release -s XXX]
Hardware:

• 699-level Part Number: 699-13701-0005-500 M.0
• P-Number: p3701-0005
• Module: NVIDIA Jetson AGX Orin (64GB ram)
• SoC: tegra23x
• CUDA Arch BIN: 8.7
• Codename: Concord
  Platform:
• Machine: aarch64
• System: Linux
• Distribution: Ubuntu 20.04 focal
• Release: 5.10.104-tegra
• Python: 3.8.10
  jtop:
• Version: 4.2.6
• Service: Active
  Libraries:
• CUDA: 11.4.315
• cuDNN: 8.6.0.166
• TensorRT: 8.5.2.2
• VPI: 2.2.4
• Vulkan: 1.3.204
• OpenCV: 4.5.4 - with CUDA: NO

[subhachandrachandra]

When GPU is in performance mode the path "/sys/devices/17000000.ga10b/enable_3d_scaling" will not exist as that feature is disabled.