Commit 50597970 authored by Boqun Feng's avatar Boqun Feng Committed by Wei Liu

Input: hyperv-keyboard: Use VMBUS_RING_SIZE() for ringbuffer sizes

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: default avatarBoqun Feng <boqun.feng@gmail.com>
Cc: Michael Kelley <mikelley@microsoft.com>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: default avatarMichael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20200916034817.30282-9-boqun.feng@gmail.comSigned-off-by: default avatarWei Liu <wei.liu@kernel.org>
parent 11d8620e
...@@ -75,8 +75,8 @@ struct synth_kbd_keystroke { ...@@ -75,8 +75,8 @@ struct synth_kbd_keystroke {
#define HK_MAXIMUM_MESSAGE_SIZE 256 #define HK_MAXIMUM_MESSAGE_SIZE 256
#define KBD_VSC_SEND_RING_BUFFER_SIZE (40 * 1024) #define KBD_VSC_SEND_RING_BUFFER_SIZE VMBUS_RING_SIZE(36 * 1024)
#define KBD_VSC_RECV_RING_BUFFER_SIZE (40 * 1024) #define KBD_VSC_RECV_RING_BUFFER_SIZE VMBUS_RING_SIZE(36 * 1024)
#define XTKBD_EMUL0 0xe0 #define XTKBD_EMUL0 0xe0
#define XTKBD_EMUL1 0xe1 #define XTKBD_EMUL1 0xe1
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment