[amdgpu_linux] Add AMD GPU widget for linux

docs/source/widgets.rst

@@ -8,6 +8,16 @@ Widget types consist of worker functions that take two arguments
 passed to :lua:func:`vicious.register`, and return a table of values
 to be formatted by ``format``.
 
+vicious.widgets.amdgpu
+----------------------
+
+Provides GPU and VRAM usage statistics for AMD graphics cards.
+
+Supported platforms: GNU/Linux (require ``sysfs``)
+
+* ``warg`` (from now on will be called *argument*): card ID, e.g. ``"card0"``
+* Returns a table with string keys: ``${gpu_usage}``, ``${mem_usage}``
+
 vicious.widgets.bat
 -------------------
 
@@ -16,7 +26,7 @@ Provides state, charge, and remaining time for a requested battery.
 Supported platforms: GNU/Linux (require ``sysfs``),
 FreeBSD (require ``acpiconf``) and OpenBSD (no extra requirements).
 
-* ``warg`` (from now on will be called *argument*):
+* Argument:
 
   * On GNU/Linux: battery ID, e.g. ``"BAT0"``
   * On FreeBSD (optional): battery ID, e.g. ``"batt"`` or ``"0"``

widgets/amdgpu_linux.lua

@@ -0,0 +1,66 @@
+-- contrib/amdgpu_linux.lua
+-- Copyright (C) 2022  Rémy Clouard <shikamaru shikamaru fr>
+--
+-- This file is part of Vicious.
+--
+-- Vicious is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as
+-- published by the Free Software Foundation, either version 2 of the
+-- License, or (at your option) any later version.
+--
+-- Vicious is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with Vicious.  If not, see <https://www.gnu.org/licenses/>.
+local io = { open = io.open }
+local tonumber = tonumber
+local string = { match = string.match }
+local helpers = require("vicious.helpers")
+
+local _mem = nil
+
+-- {{{ AMDGPU widget type
+return helpers.setcall(function (format, warg)
+    if not warg then return end
+
+    -- see https://www.kernel.org/doc/html/v5.9/gpu/amdgpu.html#busy-percent
+    local amdgpu = "/sys/class/drm/"..warg.."/device"
+    local _data = {}
+
+    local f = io.open(amdgpu .. "/gpu_busy_percent", "r")
+    if f then
+        _data["{gpu_usage}"] = f:read("*line")
+        f:close()
+    else
+        _data["{gpu_usage}"] = "N/A"
+    end
+
+    if _mem == nil then
+        f = io.open(amdgpu .. "/mem_info_vram_total", "r")
+        if f then
+            _mem = tonumber(string.match(f:read("*line"), "([%d]+)"))
+            f:close()
+        end
+    end
+
+    f = io.open(amdgpu .. "/mem_info_vram_used", "r")
+    if f then
+        local _used = tonumber(string.match(f:read("*line"), "([%d]+)"))
+        if type(_used) == 'number' and type(_mem) == 'number'
+           and _mem > 0 then
+            _data["{mem_usage}"] = _used/_mem*100
+        else
+            _data["{mem_usage}"] = "N/A"
+        end
+        f:close()
+    else
+        _data["{mem_usage}"] = "N/A"
+    end
+
+    return _data
+
+end)
+--}}}