drivers/char/adsprpc_shared.h

/*
 * Copyright (c) 2012-2013, The Linux Foundation. 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 version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * 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.
 *
 */
#ifndef ADSPRPC_SHARED_H
#define ADSPRPC_SHARED_H

#include <linux/types.h>

#define FASTRPC_IOCTL_INVOKE _IOWR('R', 1, struct fastrpc_ioctl_invoke)
#define FASTRPC_SMD_GUID "fastrpcsmd-apps-dsp"
#define DEVICE_NAME      "adsprpc-smd"

/* Retrives number of input buffers from the scalars parameter */
#define REMOTE_SCALARS_INBUFS(sc)        (((sc) >> 16) & 0x0ff)

/* Retrives number of output buffers from the scalars parameter */
#define REMOTE_SCALARS_OUTBUFS(sc)       (((sc) >> 8) & 0x0ff)

/* Retrives number of input handles from the scalars parameter */
#define REMOTE_SCALARS_INHANDLES(sc)     (((sc) >> 4) & 0x0f)

/* Retrives number of output handles from the scalars parameter */
#define REMOTE_SCALARS_OUTHANDLES(sc)    ((sc) & 0x0f)

#define REMOTE_SCALARS_LENGTH(sc)	(REMOTE_SCALARS_INBUFS(sc) +\
					REMOTE_SCALARS_OUTBUFS(sc) +\
					REMOTE_SCALARS_INHANDLES(sc) +\
					REMOTE_SCALARS_OUTHANDLES(sc))

#define REMOTE_SCALARS_MAKEX(attr, method, in, out, oin, oout) \
		((((uint32_t)   (attr) & 0x7) << 29) | \
		(((uint32_t) (method) & 0x1f) << 24) | \
		(((uint32_t)     (in) & 0xff) << 16) | \
		(((uint32_t)    (out) & 0xff) <<  8) | \
		(((uint32_t)    (oin) & 0x0f) <<  4) | \
		((uint32_t)   (oout) & 0x0f))

#define REMOTE_SCALARS_MAKE(method, in, out) \
		REMOTE_SCALARS_MAKEX(0, method, in, out, 0, 0)


#ifndef VERIFY_PRINT_ERROR
#define VERIFY_EPRINTF(format, args) (void)0
#endif

#ifndef VERIFY_PRINT_INFO
#define VERIFY_IPRINTF(args) (void)0
#endif

#ifndef VERIFY
#define __STR__(x) #x ":"
#define __TOSTR__(x) __STR__(x)
#define __FILE_LINE__ __FILE__ ":" __TOSTR__(__LINE__)

#define VERIFY(err, val) \
do {\
	VERIFY_IPRINTF(__FILE_LINE__"info: calling: " #val "\n");\
	if (0 == (val)) {\
		(err) = (err) == 0 ? -1 : (err);\
		VERIFY_EPRINTF(__FILE_LINE__"error: %d: " #val "\n", (err));\
	} else {\
		VERIFY_IPRINTF(__FILE_LINE__"info: passed: " #val "\n");\
	} \
} while (0)
#endif

#define remote_arg_t    union remote_arg

struct remote_buf {
	void *pv;		/* buffer pointer */
	int len;		/* length of buffer */
};

union remote_arg {
	struct remote_buf buf;	/* buffer info */
	uint32_t h;		/* remote handle */
};

struct fastrpc_ioctl_invoke {
	uint32_t handle;	/* remote handle */
	uint32_t sc;		/* scalars describing the data */
	remote_arg_t *pra;	/* remote arguments list */
};

struct smq_null_invoke {
	struct smq_invoke_ctx *ctx; /* invoke caller context */
	uint32_t handle;	    /* handle to invoke */
	uint32_t sc;		    /* scalars structure describing the data */
};

struct smq_phy_page {
	uint32_t addr;		/* physical address */
	uint32_t size;		/* size of contiguous region */
};

struct smq_invoke_buf {
	int num;		/* number of contiguous regions */
	int pgidx;		/* index to start of contiguous region */
};

struct smq_invoke {
	struct smq_null_invoke header;
	struct smq_phy_page page;   /* remote arg and list of pages address */
};

struct smq_msg {
	uint32_t pid;           /* process group id */
	uint32_t tid;           /* thread id */
	struct smq_invoke invoke;
};

struct smq_invoke_rsp {
	struct smq_invoke_ctx *ctx;  /* invoke caller context */
	int retval;	             /* invoke return value */
};

static inline struct smq_invoke_buf *smq_invoke_buf_start(remote_arg_t *pra,
							uint32_t sc)
{
	int len = REMOTE_SCALARS_LENGTH(sc);
	return (struct smq_invoke_buf *)(&pra[len]);
}

static inline struct smq_phy_page *smq_phy_page_start(uint32_t sc,
						struct smq_invoke_buf *buf)
{
	int nTotal = REMOTE_SCALARS_INBUFS(sc) + REMOTE_SCALARS_OUTBUFS(sc);
	return (struct smq_phy_page *)(&buf[nTotal]);
}

static inline int smq_invoke_buf_size(uint32_t sc, int nPages)
{
	struct smq_phy_page *start = smq_phy_page_start(sc, 0);
	return (int)(&(start[nPages]));
}

#endif