[PATCH VKMS v3] drm/doc: Add VKMS module description and use to "Testing and Validation"

[Rodrigo Siqueira]

lgtm, I'll apply it tomorrow.

Thanks

Reviewed-by: Rodrigo Siqueira <rodrigosiqueiramelo at gmail.com>

On 11/04, 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.
> 
> Changes since V3:
>  Rodrigo:
>  - Change the log message to imperative
>  - Fix some bad spelling/writing
>  - Add a blank line before enumeration
> 
> Changes since V2:
>  Andre:
>  - Avoid repetition of words in the same sentence;
>  - Make the explanation on 'setting the kernel' shorter, eliminate the
>    'make menuconfig' command;
>  - Add tab on enumeration to have one line per item;
>  - Clarify from each machine igt-tests commands should be ran on.
> 
> Signed-off-by: Gabriela Bittencourt <gabrielabittencourt00 at gmail.com>
> ---
> 
> Tested the patch using 'make htmldocs' to make sure the output .html is
> correct.
> 
> 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.
> ---
>  Documentation/gpu/drm-uapi.rst | 37 ++++++++++++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 
> diff --git a/Documentation/gpu/drm-uapi.rst b/Documentation/gpu/drm-uapi.rst
> index 94f90521f58c..8271c1e240b7 100644
> --- a/Documentation/gpu/drm-uapi.rst
> +++ b/Documentation/gpu/drm-uapi.rst
> @@ -285,6 +285,43 @@ 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 makes it possible to test DRM functions in a
> +virtual machine without display, simplifying the validation of some of the
> +core changes.
> +
> +To Validate changes in DRM API with VKMS, start setting the kernel: make
> +sure to enable VKMS module; 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 an example it's used virtme::
> +
> +	$ virtme-run --rwdir /path/for/shared_dir --kdir=path/for/kernel/directory --mods=auto
> +
> +Run the igt-tests in the guest machine, 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, Piglit is used
> +(-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
> 

-- 
Rodrigo Siqueira
Software Engineer, Advanced Micro Devices (AMD)
https://siqueira.tech
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