From: Boqun Feng Date: Wed, 16 Sep 2020 03:48:14 +0000 (+0800) Subject: Input: hyperv-keyboard: Use VMBUS_RING_SIZE() for ringbuffer sizes X-Git-Tag: v5.10.7~1404^2~7 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=50597970aa84cc087424ef8d3bc430665aebcece;p=platform%2Fkernel%2Flinux-rpi.git 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 Cc: Michael Kelley Cc: Dmitry Torokhov Acked-by: Dmitry Torokhov Reviewed-by: Michael Kelley Link: https://lore.kernel.org/r/20200916034817.30282-9-boqun.feng@gmail.com Signed-off-by: Wei Liu --- diff --git a/drivers/input/serio/hyperv-keyboard.c b/drivers/input/serio/hyperv-keyboard.c index df4e9f6..1a7b72a 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