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/*
* transportshm_setup.c
*
* Shared Memory Transport setup module
*
* Copyright (C) 2009 Texas Instruments, Inc.
*
* This package is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE.
*/
/* Standard headers */
#include <linux/types.h>
/* Utilities headers */
#include <linux/string.h>
#include <linux/slab.h>
/* Syslink headers */
#include <syslink/atomic_linux.h>
/* Module level headers */
#include <multiproc.h>
#include <sharedregion.h>
#include <nameserver.h>
#include <gatepeterson.h>
#include <notify.h>
#include <messageq.h>
#include <listmp.h>
#include <gatemp.h>
#include <transportshm.h>
#include <transportshm_setup.h>
/* =============================================================================
* Structures & Enums
* =============================================================================
*/
/* structure for transportshm_setup module state */
struct transportshm_setup_module_object {
void *handles[MULTIPROC_MAXPROCESSORS];
/* Store a handle per remote proc */
};
/* =============================================================================
* Globals
* =============================================================================
*/
static struct transportshm_setup_module_object transportshm_setup_state = {
.handles[0] = NULL
};
/* Pointer to the transportshm_setup module state */
static struct transportshm_setup_module_object *transportshm_setup_module =
&transportshm_setup_state;
/* =============================================================================
* Functions
* =============================================================================
*/
/*
* =========== transportshm_setup_attach ===========
* Function that will be called in messageq_attach. Creates a
* transportshm object for a given processor
*/
int transportshm_setup_attach(u16 remote_proc_id, u32 *shared_addr)
{
s32 status = 0;
struct transportshm_params params;
void *handle;
BUG_ON(remote_proc_id >= MULTIPROC_MAXPROCESSORS);
if (WARN_ON(unlikely(shared_addr == NULL))) {
status = -EINVAL;
goto exit;
}
/* Init the transport parameters */
transportshm_params_init(¶ms);
params.gate = gatemp_get_default_remote();
params.shared_addr = shared_addr;
/* Make sure notify driver has been created */
if (unlikely(notify_is_registered(remote_proc_id, 0) == false)) {
status = TRANSPORTSHM_E_FAIL;
goto exit;
}
if (multiproc_self() < remote_proc_id) {
handle = transportshm_create(remote_proc_id, ¶ms);
if (unlikely(handle == NULL)) {
status = TRANSPORTSHM_E_FAIL;
goto exit;
}
transportshm_setup_module->handles[remote_proc_id] = handle;
} else {
status = transportshm_open_by_addr(params.shared_addr, &handle);
if (status < 0)
goto exit;
transportshm_setup_module->handles[remote_proc_id] = handle;
}
exit:
if (status < 0)
pr_err("transportshm_setup_attach failed! status "
"= 0x%x", status);
return status;
}
/*
* =========== transportshm_setup_detach ===========
* Function that will be called in messageq_detach. Deletes a
* transportshm object created by transportshm_setup_attach.
*/
int transportshm_setup_detach(u16 remote_proc_id)
{
int status = 0;
void *handle = NULL;
if (WARN_ON(remote_proc_id >= MULTIPROC_MAXPROCESSORS)) {
status = -EINVAL;
goto exit;
}
handle = transportshm_setup_module->handles[remote_proc_id];
if (WARN_ON(unlikely(handle == NULL))) {
status = -EINVAL;
goto exit;
}
if (multiproc_self() < remote_proc_id) {
/* Delete the transport */
status = transportshm_delete(&handle);
if (unlikely(status < 0)) {
status = TRANSPORTSHM_E_FAIL;
goto exit;
}
transportshm_setup_module->handles[remote_proc_id] = NULL;
} else {
status = transportshm_close(&handle);
if (unlikely(status < 0)) {
status = TRANSPORTSHM_E_FAIL;
goto exit;
}
transportshm_setup_module->handles[remote_proc_id] = NULL;
}
exit:
if (status < 0)
pr_err("transportshm_setup_detach failed! status "
"= 0x%x", status);
return status;
}
/*
* =========== transportshm_setup_shared_mem_req ===========
* Function that returns the amount of shared memory required
*/
u32 transportshm_setup_shared_mem_req(u32 *shared_addr)
{
u32 mem_req = 0x0;
int status = 0;
struct transportshm_params params;
/* Don't do anything if only 1 processor in system */
if (likely(multiproc_get_num_processors() != 1)) {
BUG_ON(shared_addr == NULL);
if (unlikely(shared_addr == NULL)) {
status = -EINVAL;
goto exit;
}
transportshm_params_init(¶ms);
params.shared_addr = shared_addr;
mem_req += transportshm_shared_mem_req(¶ms);
}
exit:
if (status < 0)
pr_err("transportshm_setup_shared_mem_req failed! "
"status = 0x%x", status);
return mem_req;
}
/* Determines if a transport has been registered to a remote processor */
bool transportshm_setup_is_registered(u16 remote_proc_id)
{
bool registered;
registered = (transportshm_setup_module->handles[remote_proc_id] !=
NULL);
return registered;
}
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