diff options
author | Jack Steiner <steiner@sgi.com> | 2008-07-29 22:33:56 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-30 09:41:47 -0700 |
commit | b2fb06fcb6d6c9912b43e61394891e3994d4b613 (patch) | |
tree | 43ab4a7baa2b597b1a6417397c548f89bba1b2d3 /drivers | |
parent | 13d19498b0446cad2c394f9fbec8149b44a60c6e (diff) | |
download | linux-b2fb06fcb6d6c9912b43e61394891e3994d4b613.tar.bz2 |
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>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/misc/sgi-gru/grukservices.h | 134 |
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_ */ |