sparc64: Oracle DAX driver

DAX is a coprocessor which resides on the SPARC M7 (DAX1) and M8
(DAX2) processor chips, and has direct access to the CPU's L3 caches
as well as physical memory. It can perform several operations on data
streams with various input and output formats.  This driver provides a
transport mechanism and has limited knowledge of the various opcodes
and data formats. A user space library provides high level services
and translates these into low level commands which are then passed
into the driver and subsequently the hypervisor and the coprocessor.
The library is the recommended way for applications to use the
coprocessor, and the driver interface is not intended for general use.
Signed-off-by: Rob Gardner <rob.gardner@oracle.com>
Signed-off-by: Jonathan Helman <jonathan.helman@oracle.com>
Signed-off-by: Sanath Kumar <sanath099@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/include/uapi/asm/oradax.h

+/*
+ * Copyright (c) 2017, Oracle and/or its affiliates. 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * Oracle DAX driver API definitions
+ */
+
+#ifndef _ORADAX_H
+#define	_ORADAX_H
+
+#include <linux/types.h>
+
+#define	CCB_KILL 0
+#define	CCB_INFO 1
+#define	CCB_DEQUEUE 2
+
+struct dax_command {
+	__u16 command;		/* CCB_KILL/INFO/DEQUEUE */
+	__u16 ca_offset;	/* offset into mmapped completion area */
+};
+
+struct ccb_kill_result {
+	__u16 action;		/* action taken to kill ccb */
+};
+
+struct ccb_info_result {
+	__u16 state;		/* state of enqueued ccb */
+	__u16 inst_num;		/* dax instance number of enqueued ccb */
+	__u16 q_num;		/* queue number of enqueued ccb */
+	__u16 q_pos;		/* ccb position in queue */
+};
+
+struct ccb_exec_result {
+	__u64	status_data;	/* additional status data (e.g. bad VA) */
+	__u32	status;		/* one of DAX_SUBMIT_* */
+};
+
+union ccb_result {
+	struct ccb_exec_result exec;
+	struct ccb_info_result info;
+	struct ccb_kill_result kill;
+};
+
+#define	DAX_MMAP_LEN		(16 * 1024)
+#define	DAX_MAX_CCBS		15
+#define	DAX_CCB_BUF_MAXLEN	(DAX_MAX_CCBS * 64)
+#define	DAX_NAME		"oradax"
+
+/* CCB_EXEC status */
+#define	DAX_SUBMIT_OK			0
+#define	DAX_SUBMIT_ERR_RETRY		1
+#define	DAX_SUBMIT_ERR_WOULDBLOCK	2
+#define	DAX_SUBMIT_ERR_BUSY		3
+#define	DAX_SUBMIT_ERR_THR_INIT		4
+#define	DAX_SUBMIT_ERR_ARG_INVAL	5
+#define	DAX_SUBMIT_ERR_CCB_INVAL	6
+#define	DAX_SUBMIT_ERR_NO_CA_AVAIL	7
+#define	DAX_SUBMIT_ERR_CCB_ARR_MMU_MISS	8
+#define	DAX_SUBMIT_ERR_NOMAP		9
+#define	DAX_SUBMIT_ERR_NOACCESS		10
+#define	DAX_SUBMIT_ERR_TOOMANY		11
+#define	DAX_SUBMIT_ERR_UNAVAIL		12
+#define	DAX_SUBMIT_ERR_INTERNAL		13
+
+/* CCB_INFO states - must match HV_CCB_STATE_* definitions */
+#define	DAX_CCB_COMPLETED	0
+#define	DAX_CCB_ENQUEUED	1
+#define	DAX_CCB_INPROGRESS	2
+#define	DAX_CCB_NOTFOUND	3
+
+/* CCB_KILL actions - must match HV_CCB_KILL_* definitions */
+#define	DAX_KILL_COMPLETED	0
+#define	DAX_KILL_DEQUEUED	1
+#define	DAX_KILL_KILLED		2
+#define	DAX_KILL_NOTFOUND	3
+
+#endif /* _ORADAX_H */

drivers/sbus/char/Kconfig

@@ -70,5 +70,13 @@ config DISPLAY7SEG
 	  another UltraSPARC-IIi-cEngine boardset with a 7-segment display,
 	  you should say N to this option.
 
+config ORACLE_DAX
+	tristate "Oracle Data Analytics Accelerator"
+	default m if SPARC64
+	help
+	 Driver for Oracle Data Analytics Accelerator, which is
+	 a coprocessor that performs database operations in hardware.
+	 It is available on M7 and M8 based systems only.
+
 endmenu
 

drivers/sbus/char/Makefile

@@ -17,3 +17,4 @@ obj-$(CONFIG_SUN_OPENPROMIO)		+= openprom.o
 obj-$(CONFIG_TADPOLE_TS102_UCTRL)	+= uctrl.o
 obj-$(CONFIG_SUN_JSFLASH)		+= jsflash.o
 obj-$(CONFIG_BBC_I2C)			+= bbc.o
+obj-$(CONFIG_ORACLE_DAX) 		+= oradax.o