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      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