linux-kernel - Re: [PATCH v3 7/7] habanalabs: create two char devices per ASIC

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Date:   Wed, 31 Jul 2019 15:02:23 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Oded Gabbay <oded.gabbay@...il.com>
Cc:     linux-kernel@...r.kernel.org, oshpigelman@...ana.ai,
        ttayar@...ana.ai
Subject: Re: [PATCH v3 7/7] habanalabs: create two char devices per ASIC

On Wed, Jul 31, 2019 at 03:59:01PM +0300, Oded Gabbay wrote:
> This patch changes the driver to create two char devices for each ASIC
> it discovers. This is done to allow system/monitoring applications to
> query the device for stats, information, idle state and more, while also
> allowing the deep-learning application to send work to the ASIC.
> 
> One char device is the original device, hlX. IOCTL calls through this
> device file can perform any task on the device (compute, memory, queries).
> The open function for this device will fail if it was called before but
> the file-descriptor it created was not completely released yet (the
> release callback function is not called from the kernel until all
> instances of that FD are closed). The driver needs to keep this behavior
> to support backward compatibility with existing userspace, which count
> that the open will fail if the device is "occupied".
> 
> The second char device is called "hl_controlDx", where x is the same index
> of the main device with a minor number of the original char device + 1.
> Applications that open this device can only call the INFO IOCTL. There is
> no limitation on the number of applications opening this device.
> 
> Signed-off-by: Oded Gabbay <oded.gabbay@...il.com>

Looks good, thanks for changing the minor allocation:

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>