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