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From: Daniel Vetter <>
To: Gabriela Bittencourt <>
Subject: Re: [PATCH] drm/doc: Adding VKMS module description and use to "Testing and Validation"
Date: Mon, 4 Nov 2019 19:19:33 +0100	[thread overview]
Message-ID: <20191104181933.GR10326@phenom.ffwll.local> (raw)
Message-ID: <20191104181933.HDdxZc-U5KEx02PYQocF2l_OE4BdrqANoIpa657d57k@z> (raw)
In-Reply-To: <>

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 <>
> ---
> 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.

> ---
>  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 @@ 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/ -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
dri-devel mailing list

  parent reply	other threads:[~2019-11-04 18:19 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-01  4:27 [PATCH] drm/doc: Adding VKMS module description and use to "Testing and Validation" Gabriela Bittencourt
2019-11-01  4:27 ` Gabriela Bittencourt
2019-11-01 13:14 ` [Lkcamp] " André Almeida
2019-11-01 13:14   ` André Almeida
2019-11-04 18:19 ` Daniel Vetter [this message]
2019-11-04 18:19   ` Daniel Vetter

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