linux-kernel - Re: [PATCH v1 1/9] drivers: hv: dxgkrnl: Driver initialization and creation of dxgadapter

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Message-ID: <Yd/YIZQqn7Uvi8dB@kroah.com>
Date:   Thu, 13 Jan 2022 08:43:29 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Iouri Tarassov <iourit@...ux.microsoft.com>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org, spronovo@...rosoft.com
Subject: Re: [PATCH v1 1/9] drivers: hv: dxgkrnl: Driver initialization and
 creation of dxgadapter

On Wed, Jan 12, 2022 at 11:55:06AM -0800, Iouri Tarassov wrote:
> - Add support for a Hyper-V based vGPU implementation that exposes the
>   DirectX API to Linux userspace.
> - Handle driver loading, registration for the PCI and VM bus device
>   notifications
> - Add headers for user mode interfaces, internal driver objects and VM bus
>   communication interface
> - Handle initialization of VM bus channels and creation of the dxgadapter
>   object
> - Removed dxg_copy_from_user and dxg_copy_to_user
> - Connect the dxgkrnl module to the drivers/hv/ makefile and Kconfig.
> - Create a MAINTAINERS entry

This looks like a history list?

What exactly is this?

> 
> PCI driver registration
> 
> A PCI device is created for each virtual GPU (vGPU) device, projected by
> the host. The device vendor is PCI_VENDOR_ID_MICROSOFT and device id is
> PCI_DEVICE_ID_VIRTUAL_RENDER. dxg_pci_probe_device handles arrival of such
> devices and it creates dxgadapter objects. The PCI config space of the
> vGPU device has luid of the corresponding per GPU VM bus channel. This is
> how the adapters are linked to VM bus channels.
> 
> dxgadapter initialization
> 
> A dxgadapter object represents a virtual GPU, projected to the VM by the
> host. This object can start functioning only when the global VM bus
> channel and the corresponding per vGPU VM bus channel are initialized in
> the guest. Notifications about arrival of vGPU PCI device and VM bus
> channels can happen in any order. Therefore, the initial dxgadapter object
> state is DXGADAPTER_STATE_WAITING_VMBUS. A list of VM bus channels and a
> list of dxgadapter objects are created. When dxgkrnl is notified about a
> VM bus channel arrival, if tries to start all adapters, which are not
> started yet.
> 
> VM bus interface version is exchanged by reading/writing the PCI config
> space of the vGPU device.
> 
> Signed-off-by: Iouri Tarassov <iourit@...ux.microsoft.com>
> ---
>  MAINTAINERS                     |    7 +
>  drivers/hv/Kconfig              |    2 +
>  drivers/hv/Makefile             |    1 +
>  drivers/hv/dxgkrnl/Kconfig      |   26 +
>  drivers/hv/dxgkrnl/Makefile     |    5 +
>  drivers/hv/dxgkrnl/dxgadapter.c |  189 +++
>  drivers/hv/dxgkrnl/dxgkrnl.h    |  953 +++++++++++++++
>  drivers/hv/dxgkrnl/dxgmodule.c  |  882 ++++++++++++++
>  drivers/hv/dxgkrnl/dxgprocess.c |   37 +
>  drivers/hv/dxgkrnl/dxgvmbus.c   |  543 +++++++++
>  drivers/hv/dxgkrnl/dxgvmbus.h   |  901 ++++++++++++++
>  drivers/hv/dxgkrnl/hmgr.c       |   88 ++
>  drivers/hv/dxgkrnl/hmgr.h       |  112 ++
>  drivers/hv/dxgkrnl/ioctl.c      |   37 +
>  drivers/hv/dxgkrnl/misc.c       |   37 +
>  drivers/hv/dxgkrnl/misc.h       |   96 ++
>  include/linux/hyperv.h          |   16 +
>  include/uapi/misc/d3dkmthk.h    | 1954 +++++++++++++++++++++++++++++++

Why are you adding apis and structures that you are not actually using
in this commit?  Please only add the ones that you use, when you use
them.

This commit should be much smaller, and in more different parts.

thanks,

greg k-h