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authorBoqun Feng <boqun.feng@gmail.com>2020-09-16 11:48:14 +0800
committerWei Liu <wei.liu@kernel.org>2020-09-28 08:57:20 +0000
commit50597970aa84cc087424ef8d3bc430665aebcece (patch)
treedbff3798f3726c1af864ffea198c2e045bd7b434 /drivers/input
parent11d8620e0867cb21313aa66ff6ce0172e28f68ff (diff)
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.c4
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