bte.h
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:3k
- /*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (c) 2001-2002 Silicon Graphics, Inc. All rights reserved.
- */
- #ifndef _ASM_IA64_SN_BTE_H
- #define _ASM_IA64_SN_BTE_H
- #ident "$Revision: 1.1 $"
- #include <linux/spinlock.h>
- #include <linux/cache.h>
- #include <asm/sn/io.h>
- #define L1_CACHE_MASK (L1_CACHE_BYTES - 1) /* Mask to retrieve
- * the offset into this
- * cache line.*/
- /* BTE status register only supports 16 bits for length field */
- #define BTE_LEN_BITS (16)
- #define BTE_LEN_MASK ((1 << BTE_LEN_BITS) - 1)
- #define BTE_MAX_XFER ((1 << BTE_LEN_BITS) * L1_CACHE_BYTES)
- /*
- * Constants used in determining the best and worst case transfer
- * times. To help explain the two, the following graph of transfer
- * status vs time may help.
- *
- * active +------------------:-+ :
- * status | : | :
- * idle +__________________:_+=======
- * 0 Time MaxT MinT
- *
- * Therefore, MaxT is the maximum thoeretical rate for transfering
- * the request block (assuming ideal circumstances)
- *
- * MinT is the minimum theoretical rate for transferring the
- * requested block (assuming maximum link distance and contention)
- *
- * The following defines are the inverse of the above. They are
- * used for calculating the MaxT time and MinT time given the
- * number of lines in the transfer.
- */
- #define BTE_MAXT_LINES_PER_SECOND 800
- #define BTE_MINT_LINES_PER_SECOND 600
- /* Define hardware */
- #define BTES_PER_NODE 2
- /* Define hardware modes */
- #define BTE_NOTIFY (IBCT_NOTIFY)
- #define BTE_NORMAL BTE_NOTIFY
- #define BTE_ZERO_FILL (BTE_NOTIFY | IBCT_ZFIL_MODE)
- /* Use a reserved bit to let the caller specify a wait for any BTE */
- #define BTE_WACQUIRE (0x4000)
- /*
- * Structure defining a bte. An instance of this
- * structure is created in the nodepda for each
- * bte on that node (as defined by BTES_PER_NODE)
- * This structure contains everything necessary
- * to work with a BTE.
- */
- typedef struct bteinfo_s {
- u64 volatile notify ____cacheline_aligned;
- char *bte_base_addr ____cacheline_aligned;
- spinlock_t spinlock;
- u64 idealTransferTimeout;
- u64 idealTransferTimeoutReached;
- u64 mostRecentSrc;
- u64 mostRecentDest;
- u64 mostRecentLen;
- u64 mostRecentMode;
- u64 volatile *mostRecentNotification;
- void *bteTestBuf;
- } bteinfo_t;
- /* Possible results from bte_copy and bte_unaligned_copy */
- typedef enum {
- BTE_SUCCESS, /* 0 is success */
- BTEFAIL_NOTAVAIL, /* BTE not available */
- BTEFAIL_ERROR, /* Generic error */
- BTEFAIL_DIR /* Diretory error */
- } bte_result_t;
- #endif /* _ASM_IA64_SN_BTE_H */