On Fri, Nov 01, 2019 at 01:27:06AM -0300, Gabriela Bittencourt wrote: > Add a description on VKMS module and the cases in which it should be used. > There's a brief explanation on how to set it and use it in a VM, along with > an example of running an igt-test. > > Signed-off-by: Gabriela Bittencourt <gabrielabittencourt00@xxxxxxxxx> > > --- > > Hi DRM-community, > this is my first (of many, I hope) patch in this subsystem. I hope to have > a lot of learning (and fun :)) working with you guys. > I'm starting by documenting the VKMS driver in "Userland interfaces", if I > have been inaccurate in my description or if I misunderstood some concept, > please let me know. Oh awesome, this sounds great, really looking for more people hacking on vkms. Docs lgtm, but I'll let Siqueira have a look and merge it. Pls ping in case this patch gets lost. -Daniel > --- > Documentation/gpu/drm-uapi.rst | 38 ++++++++++++++++++++++++++++++++++ > 1 file changed, 38 insertions(+) > > diff --git a/Documentation/gpu/drm-uapi.rst b/Documentation/gpu/drm-uapi.rst > index 94f90521f58c..7d6c86b7af76 100644 > --- a/Documentation/gpu/drm-uapi.rst > +++ b/Documentation/gpu/drm-uapi.rst > @@ -285,6 +285,44 @@ run-tests.sh is a wrapper around piglit that will execute the tests matching > the -t options. A report in HTML format will be available in > ./results/html/index.html. Results can be compared with piglit. > > +Using VKMS to test DRM API > +-------------------------- > + > +VKMS is a software-only model of a KMS driver that is useful for testing > +and for running compositors. VKMS aims to enable a virtual display without > +the need for a hardware display capability. These characteristics made VKMS > +a perfect tool for validating the DRM core behavior and also support the > +compositor developer. VKMS helps us to test DRM core function in a virtual > +machine, which makes it easy to test some of the core changes. > + > +To Validate changes in DRM API with VKMS, start setting the kernel. The > +VKMS module is not enabled by defaut, so enable it in the menuconfig:: > + > + $ make menuconfig > + > +Compile the kernel with the VKMS enabled and install it in the target > +machine. VKMS can be run in a Virtual Machine (QEMU, virtme or similar). > +It's recommended the use of KVM with the minimum of 1GB of RAM and four > +cores. > + > +It's possible to run the IGT-tests in a VM in two ways: > +1. Use IGT inside a VM > +2. Use IGT from the host machine and write the results in a shared directory. > + > +As follow, there is an example of using a VM with a shared directory with > +the host machine to run igt-tests. As example it's used virtme:: > + > + $ virtme-run --rwdir /path/for/shared_dir --kdir=path/for/kernel/directory --mods=auto > + > +Run the igt-tests, as example it's ran the 'kms_flip' tests:: > + > + $ /path/for/igt-gpu-tools/scripts/run-tests.sh -p -s -t "kms_flip.*" -v > + > +In this example instead of build the igt_runner it's used Piglit > +(-p option); it's created html summary of the tests results and it's saved > +in the folder "igt-gpu-tools/results"; it's executed only the igt-tests > +matching the -t option. > + > Display CRC Support > ------------------- > > -- > 2.20.1 > -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch
