patch-2.4.19 linux-2.4.19/include/asm-ia64/sn/bte.h

• Lines: 93
• Date: Fri Aug 2 17:39:45 2002
• Orig file: linux-2.4.18/include/asm-ia64/sn/bte.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/include/asm-ia64/sn/bte.h linux-2.4.19/include/asm-ia64/sn/bte.h
@@ -0,0 +1,92 @@
+/*
+ * 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 */