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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 134 insertions, 0 deletions

diff --git a/drivers/misc/sgi-gru/grukservices.h b/drivers/misc/sgi-gru/grukservices.h
new file mode 100644
index 000000000000..eb17e0a3ac61
--- /dev/null
+++ b/drivers/misc/sgi-gru/grukservices.h
@@ -0,0 +1,134 @@
+
+/*
+ *  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:
+ *      0       OK
+ *      >0      error
+ */
+extern int gru_create_message_queue(void *p, unsigned int bytes);
+
+/*
+ * Send a message to a message queue.
+ *
+ * Note: The message queue transport mechanism uses the first 32
+ * bits of the message. Users should avoid using these bits.
+ *
+ *
+ *   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(unsigned long mq_gpa, 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_UNEXPECTED_CB_ERR   3       /* unexpected CB error */
+#define MQE_PAGE_OVERFLOW       10      /* BUG - queue overflowed a page */
+#define MQE_BUG_NO_RESOURCES    11      /* BUG - could not alloc GRU cb/dsr */
+
+/*
+ * Advance the receive pointer for the message queue to the next message.
+ * Note: current API requires messages to be gotten & freed in order. Future
+ * API extensions may allow for out-of-order freeing.
+ *
+ *   Input
+ *      mq      message queue
+ *      mesq    message being freed
+ */
+extern void gru_free_message(void *mq, void *mesq);
+
+/*
+ * Get next message from message queue. Returns pointer to
+ * message OR NULL if no message present.
+ * User must call gru_free_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_get_next_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
+ *
+ *    Output:
+ *      0               OK
+ *      >0              error
+ */
+extern int gru_copy_gpa(unsigned long dest_gpa, unsigned long src_gpa,
+                                                        unsigned int bytes);
+
+#endif          /* __GRU_KSERVICES_H_ */