diff options
Diffstat (limited to 'drivers/hv')
| -rw-r--r-- | drivers/hv/hv_utils_transport.c | 2 | ||||
| -rw-r--r-- | drivers/hv/ring_buffer.c | 23 |
2 files changed, 24 insertions, 1 deletions
diff --git a/drivers/hv/hv_utils_transport.c b/drivers/hv/hv_utils_transport.c index 4402a71e23f7..047959e74bb1 100644 --- a/drivers/hv/hv_utils_transport.c +++ b/drivers/hv/hv_utils_transport.c @@ -104,7 +104,7 @@ static ssize_t hvt_op_write(struct file *file, const char __user *buf, return ret ? ret : count; } -static unsigned int hvt_op_poll(struct file *file, poll_table *wait) +static __poll_t hvt_op_poll(struct file *file, poll_table *wait) { struct hvutil_transport *hvt; diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c index 12eb8caa4263..50e071444a5c 100644 --- a/drivers/hv/ring_buffer.c +++ b/drivers/hv/ring_buffer.c @@ -140,6 +140,29 @@ static u32 hv_copyto_ringbuffer( return start_write_offset; } +/* + * + * hv_get_ringbuffer_availbytes() + * + * Get number of bytes available to read and to write to + * for the specified ring buffer + */ +static void +hv_get_ringbuffer_availbytes(const struct hv_ring_buffer_info *rbi, + u32 *read, u32 *write) +{ + u32 read_loc, write_loc, dsize; + + /* Capture the read/write indices before they changed */ + read_loc = READ_ONCE(rbi->ring_buffer->read_index); + write_loc = READ_ONCE(rbi->ring_buffer->write_index); + dsize = rbi->ring_datasize; + + *write = write_loc >= read_loc ? dsize - (write_loc - read_loc) : + read_loc - write_loc; + *read = dsize - *write; +} + /* Get various debug metrics for the specified ring buffer. */ void hv_ringbuffer_get_debuginfo(const struct hv_ring_buffer_info *ring_info, struct hv_ring_buffer_debug_info *debug_info) |