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Subject[patch 04/11] GRU Driver - kernel services header files
This patch contains the header file used to export GRU services to other
kernel drivers such as XPMEM or XPNET.


Signed-off-by: Jack Steiner <steiner@sgi.com>

---
drivers/misc/gru/grukservices.h | 119 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 119 insertions(+)
Index: linux/drivers/misc/gru/grukservices.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux/drivers/misc/gru/grukservices.h 2008-06-09 13:53:05.884788941 -0500
@@ -0,0 +1,119 @@
+
+/*
+ * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#ifndef __GRU_KSERVICES_H_
+#define __GRU_KSERVICES_H_
+
+
+/*
+ * Message queues using the GRU to send/receive messages.
+ *
+ * These function allow the user to create a message queue for
+ * sending/receiving 1 or 2 cacheline messages using the GRU.
+ *
+ * Processes SENDING messages will use a kernel CBR/DSR to send
+ * the message. This is transparent to the caller.
+ *
+ * The receiver does not use any GRU resources.
+ *
+ * The functions support:
+ * - single receiver
+ * - multiple senders
+ * - cross partition message
+ *
+ * Missing features ZZZ:
+ * - user options for dealing with timeouts, queue full, etc.
+ * - gru_create_message_queue() needs interrupt vector info
+ */
+
+/*
+ * Initialize a user allocated chunk of memory to be used as
+ * a message queue. The caller must ensure that the queue is
+ * in contiguous physical memory and is cacheline aligned.
+ *
+ * Message queue size is the total number of bytes allocated
+ * to the queue including a 2 cacheline header that is used
+ * to manage the queue.
+ *
+ * Input:
+ * p pointer to user allocated memory.
+ * bytes size of message queue in bytes
+ *
+ * Errors:
+ */
+extern int gru_create_message_queue(void *p, unsigned int bytes);
+
+/*
+ * Send a message to a message queue
+ *
+ * Input:
+ * xmq message queue - must be a UV global physical address
+ * mesg pointer to message. Must be 64-bit aligned
+ * bytes size of message in bytes
+ *
+ * Output:
+ * 0 message sent
+ * >0 Send failure - see error codes below
+ *
+ */
+extern int gru_send_message_gpa(void *xmq, void *mesg, unsigned int bytes);
+
+/* Status values for gru_send_message() */
+#define MQE_OK 0 /* message sent successfully */
+#define MQE_CONGESTION 1 /* temporary congestion, try again */
+#define MQE_QUEUE_FULL 2 /* queue is full */
+#define MQE_PAGE_OVERFLOW 3 /* queue overflowed a page */
+#define MQE_UNEXPECTED_CB_ERR 4 /* unexpected CB error */
+#define MQE_BUG_NO_RESOURCES 10 /* BUG - could not alloc GRU cb/dsr */
+
+/*
+ * Advance the receive pointer for the message queue to the next message.
+ *
+ * Input
+ * mq message queue
+ */
+extern void gru_next_message(void *mq);
+
+/*
+ * Get next message from message queue. Returns pointer to
+ * message OR NULL if no message present.
+ * User must call gru_next_message() after message is processed
+ * in order to move the queue pointers to next message.
+ *
+ * Input
+ * mq message queue
+ *
+ * Output:
+ * p pointer to message
+ * NULL no message available
+ */
+extern void *gru_receive_message(void *mq);
+
+
+/*
+ * Copy data using the GRU. Source or destination can be located in a remote
+ * partition.
+ *
+ * Input:
+ * dest_gpa destination global physical address
+ * src_gpa source global physical address
+ * bytes number of bytes to copy
+ */
+extern int gru_copy_gpa(void *dest_gpa, void *src_gpa, unsigned int bytes);
+
+#endif /* __GRU_KSERVICES_H_ */
--
Thanks

Jack Steiner (steiner@sgi.com) 651-683-5302
Sr Principal Engineer SGI - Silicon Graphics, Inc.




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