Re: [PATCH for-next] RDMA/hns: Support mmapping reset state to userspace

[Jason Gunthorpe]

On Mon, Oct 14, 2024 at 09:07:31PM +0800, Junxian Huang wrote:
> From: Chengchang Tang <tangchengchang@xxxxxxxxxx>
> 
> Mmap reset state to notify userspace about HW reset. The mmaped flag
> hw_ready will be initiated to a non-zero value. When HW is reset,
> the mmap page will be zapped and userspace will get a zero value of
> hw_ready.

This needs alot more explanation about *why* does userspace need this
information and why is hns unique here.

Usually when the HW is reset there are enough existing system calls
that will start failing that a driver should not need to do something
like this.

Jason