1/**
2 * Copyright (c) 2010-2012 Broadcom. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions, and the following disclaimer,
9 *    without modification.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. The names of the above-listed copyright holders may not be used
14 *    to endorse or promote products derived from this software without
15 *    specific prior written permission.
16 *
17 * ALTERNATIVELY, this software may be distributed under the terms of the
18 * GNU General Public License ("GPL") version 2, as published by the Free
19 * Software Foundation.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
22 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
25 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
28 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#ifndef VCHI_CFG_INTERNAL_H_
35#define VCHI_CFG_INTERNAL_H_
36
37/****************************************************************************************
38 * Control optimisation attempts.
39 ***************************************************************************************/
40
41// Don't use lots of short-term locks - use great long ones, reducing the overall locks-per-second
42#define VCHI_COARSE_LOCKING
43
44// Avoid lock then unlock on exit from blocking queue operations (msg tx, bulk rx/tx)
45// (only relevant if VCHI_COARSE_LOCKING)
46#define VCHI_ELIDE_BLOCK_EXIT_LOCK
47
48// Avoid lock on non-blocking peek
49// (only relevant if VCHI_COARSE_LOCKING)
50#define VCHI_AVOID_PEEK_LOCK
51
52// Use one slot-handler thread per connection, rather than 1 thread dealing with all connections in rotation.
53#define VCHI_MULTIPLE_HANDLER_THREADS
54
55// Put free descriptors onto the head of the free queue, rather than the tail, so that we don't thrash
56// our way through the pool of descriptors.
57#define VCHI_PUSH_FREE_DESCRIPTORS_ONTO_HEAD
58
59// Don't issue a MSG_AVAILABLE callback for every single message. Possibly only safe if VCHI_COARSE_LOCKING.
60#define VCHI_FEWER_MSG_AVAILABLE_CALLBACKS
61
62// Don't use message descriptors for TX messages that don't need them
63#define VCHI_MINIMISE_TX_MSG_DESCRIPTORS
64
65// Nano-locks for multiqueue
66//#define VCHI_MQUEUE_NANOLOCKS
67
68// Lock-free(er) dequeuing
69//#define VCHI_RX_NANOLOCKS
70
71#endif /*VCHI_CFG_INTERNAL_H_*/
72