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authorBoqun Feng <boqun.feng@gmail.com>2020-09-16 06:48:15 +0300
committerWei Liu <wei.liu@kernel.org>2020-09-28 11:57:28 +0300
commitd02a26991ecee772f8e510ce46ccac87ce480554 (patch)
tree83ea445457395ba0490d89e8caf8812b58e56367 /drivers/hid
parent50597970aa84cc087424ef8d3bc430665aebcece (diff)
downloadlinux-d02a26991ecee772f8e510ce46ccac87ce480554.tar.xz
HID: hyperv: 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: Jiri Kosina <jkosina@suse.cz> Cc: Michael Kelley <mikelley@microsoft.com> Reviewed-by: Michael Kelley <mikelley@microsoft.com> Link: https://lore.kernel.org/r/20200916034817.30282-10-boqun.feng@gmail.com Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'drivers/hid')
-rw-r--r--drivers/hid/hid-hyperv.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/hid/hid-hyperv.c b/drivers/hid/hid-hyperv.c
index 0b6ee1dee625..978ee2aab2d4 100644
--- a/drivers/hid/hid-hyperv.c
+++ b/drivers/hid/hid-hyperv.c
@@ -104,8 +104,8 @@ struct synthhid_input_report {
#pragma pack(pop)
-#define INPUTVSC_SEND_RING_BUFFER_SIZE (40 * 1024)
-#define INPUTVSC_RECV_RING_BUFFER_SIZE (40 * 1024)
+#define INPUTVSC_SEND_RING_BUFFER_SIZE VMBUS_RING_SIZE(36 * 1024)
+#define INPUTVSC_RECV_RING_BUFFER_SIZE VMBUS_RING_SIZE(36 * 1024)
enum pipe_prot_msg_type {