lkml.org 
[lkml]   [2020]   [Sep]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v4 08/11] Input: hyperv-keyboard: Use VMBUS_RING_SIZE() for ringbuffer sizes
On Wed, Sep 16, 2020 at 11:48:14AM +0800, Boqun Feng wrote:
> For a Hyper-V vmbus, the size of the ringbuffer has two requirements:
>
> 1) it has to take one PAGE_SIZE for the header
>
> 2) it has to be PAGE_SIZE aligned so that double-mapping can work
>
> VMBUS_RING_SIZE() could calculate a correct ringbuffer size which
> fulfills both requirements, therefore use it to make sure vmbus work
> when PAGE_SIZE != HV_HYP_PAGE_SIZE (4K).
>
> Note that since the argument for VMBUS_RING_SIZE() is the size of
> payload (data part), so it will be minus 4k (the size of header when
> PAGE_SIZE = 4k) than the original value to keep the ringbuffer total
> size unchanged when PAGE_SIZE = 4k.
>
> Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
> Cc: Michael Kelley <mikelley@microsoft.com>
> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Please feel free to merge through whatever tree the rest of the patches
will go.

Thanks.

--
Dmitry

\
 
 \ /
  Last update: 2020-09-16 06:06    [W:0.106 / U:0.936 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site