The Size Of Different DRM Graphics Drivers In Linux 4.7
This lines-of-code counting was mostly done out of a curiosity factor. In this article I'm just looking at the in-kernel DRM code and not the Mesa drivers, DDX drivers, LLVM back-ends, or anything else in user-space related to the open-source graphics drivers.
All of these cloc measurements were done on the Linux mainline kernel Git code as of this morning. First up was the Intel DRM (i915) driver.
------------------------------------------------------------------------------- Language files blank comment code ------------------------------------------------------------------------------- C 79 18416 15443 80757 C/C++ Header 23 2262 3178 13730
Basically about 94.5k lines of code across 103 files. 18.6k lines of comments if you are wondering how well documented the code is...
Next is a look at Nouveau:
------------------------------------------------------------------------------- Language files blank comment code ------------------------------------------------------------------------------- C 535 12802 16385 88078 C/C++ Header 276 1874 2639 27542
A total of 115.6k lines of code across 811 files... And 19k lines of documentation.
The AMDGPU/Radeon DRM is a bit more difficult to get a firm look at since some code is shared between the two drivers. In the AMDGPU driver directory they also have the AMDKFD driver code and more. So first up is a look at the radeon/ directory.
------------------------------------------------------------------------------- Language files blank comment code ------------------------------------------------------------------------------- C 111 17644 13065 120312 C/C++ Header 83 4042 5648 39420
The Radeon driver is around 159k lines of code across 195 files but even though this driver is larger than the others there is just 18k lines of comments.
And then the AMDGPU directory that also includes AMDKFD and other shared code with it:
------------------------------------------------------------------------------- Language files blank comment code ------------------------------------------------------------------------------- C/C++ Header 248 6412 10419 440630 C 148 20526 14909 102460
Damn! AMDGPU loves the header files at 440k lines of code while the detected C code by cloc comes in at just 102k lines of code. If looking at just amd/amdgpu it amounts to:
------------------------------------------------------------------------------- Language files blank comment code ------------------------------------------------------------------------------- C 86 12279 9856 69476 C/C++ Header 66 1727 3393 9991
The AMDGPU driver gained a lot of weight this year when it came to adding the Polaris hardware support. There's also a lot more code yet to be merged in the form of the DAL display abstraction layer that isn't being merged until at least Linux 4.9.
For those wondering about the size of fully-capable of ARM DRM drivers, VC4 for Raspberry Pi comes in at just under 7k lines of code.
------------------------------------------------------------------------------- Language files blank comment code ------------------------------------------------------------------------------- C 16 1258 1012 5586 C/C++ Header 5 260 361 1304
Or the Freedreno MSM DRM driver is around 35k lines of code:
------------------------------------------------------------------------------- Language files blank comment code ------------------------------------------------------------------------------- C 67 4939 2867 20574 C/C++ Header 37 3405 1114 14723
7 Comments
