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| author |   Boqun Feng <boqun.feng@gmail.com> | 2020-09-16 11:48:14 +0800 |
|---|---|---|
| committer |   Wei Liu <wei.liu@kernel.org> | 2020-09-28 08:57:20 +0000 |
| commit | 50597970aa84cc087424ef8d3bc430665aebcece (patch) | |
| tree | dbff3798f3726c1af864ffea198c2e045bd7b434 /drivers/input | |
| parent | hv_netvsc: Use HV_HYP_PAGE_SIZE for Hyper-V communication (diff) | |
| download | linux-dev-50597970aa84cc087424ef8d3bc430665aebcece.tar.xz linux-dev-50597970aa84cc087424ef8d3bc430665aebcece.zip | |
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: 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>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20200916034817.30282-9-boqun.feng@gmail.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'drivers/input')
| -rw-r--r-- | drivers/input/serio/hyperv-keyboard.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/input/serio/hyperv-keyboard.c b/drivers/input/serio/hyperv-keyboard.c index df4e9f6f4529..1a7b72a9016d 100644 --- a/drivers/input/serio/hyperv-keyboard.c +++ b/drivers/input/serio/hyperv-keyboard.c @@ -75,8 +75,8 @@ struct synth_kbd_keystroke { #define HK_MAXIMUM_MESSAGE_SIZE 256 -#define KBD_VSC_SEND_RING_BUFFER_SIZE (40 * 1024) -#define KBD_VSC_RECV_RING_BUFFER_SIZE (40 * 1024) +#define KBD_VSC_SEND_RING_BUFFER_SIZE VMBUS_RING_SIZE(36 * 1024) +#define KBD_VSC_RECV_RING_BUFFER_SIZE VMBUS_RING_SIZE(36 * 1024) #define XTKBD_EMUL0 0xe0 #define XTKBD_EMUL1 0xe1 |