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| author |   Boqun Feng <boqun.feng@gmail.com> | 2020-09-16 11:48:15 +0800 |
|---|---|---|
| committer |   Wei Liu <wei.liu@kernel.org> | 2020-09-28 08:57:28 +0000 |
| commit | d02a26991ecee772f8e510ce46ccac87ce480554 (patch) | |
| tree | 83ea445457395ba0490d89e8caf8812b58e56367 | |
| parent | Input: hyperv-keyboard: Use VMBUS_RING_SIZE() for ringbuffer sizes (diff) | |
| download | linux-dev-d02a26991ecee772f8e510ce46ccac87ce480554.tar.xz linux-dev-d02a26991ecee772f8e510ce46ccac87ce480554.zip | |
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>
| -rw-r--r-- | drivers/hid/hid-hyperv.c | 4 |
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 { |