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ipc: add api to vote for upgrading thread priority

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For some time critical tasks, the thread priority
might need to be upgraded to Real-Time Thread
priority level. Expose an interface from APR layer
so that clients can vote for a priority upgrade
whenever needed.

Change-Id: Ieb4afa914905750eccdf7672020a8751fdcf6462
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>
This commit is contained in:
Banajit Goswami 2017-12-08 10:51:58 -08:00
commit 8832732009
4 changed files with 138 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

4
include/ipc/apr.h
View file

@ -1,4 +1,4 @@
/* Copyright (c) 2010-2016, The Linux Foundation. All rights reserved.
/* Copyright (c) 2010-2017, 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
@ -188,4 +188,6 @@ int apr_set_q6_state(enum apr_subsys_state state);
void apr_set_subsys_state(void);
const char *apr_get_lpass_subsys_name(void);
uint16_t apr_get_reset_domain(uint16_t proc);
int apr_start_rx_rt(void *handle);
int apr_end_rx_rt(void *handle);
#endif

3
include/ipc/apr_tal.h
View file

@ -74,7 +74,8 @@ int apr_tal_close(struct apr_svc_ch_dev *apr_ch);
int apr_tal_rx_intents_config(struct apr_svc_ch_dev *apr_ch,
int num_of_intents, uint32_t size);
int apr_tal_init(void);
int apr_tal_start_rx_rt(struct apr_svc_ch_dev *apr_ch);
int apr_tal_end_rx_rt(struct apr_svc_ch_dev *apr_ch);
struct apr_svc_ch_dev {
void *handle;

101
ipc/apr.c
View file

@ -774,6 +774,107 @@ static void apr_reset_deregister(struct work_struct *work)
kfree(apr_reset);
}
/**
* apr_start_rx_rt - Clients call to vote for thread
* priority upgrade whenever needed.
*
* @handle: APR service handle
*
* Returns 0 on success or error otherwise.
*/
int apr_start_rx_rt(void *handle)
{
int rc = 0;
struct apr_svc *svc = handle;
uint16_t dest_id = 0;
uint16_t client_id = 0;
if (!svc) {
pr_err("%s: Invalid APR handle\n", __func__);
return -EINVAL;
}
mutex_lock(&svc->m_lock);
dest_id = svc->dest_id;
client_id = svc->client_id;
if ((client_id >= APR_CLIENT_MAX) || (dest_id >= APR_DEST_MAX)) {
pr_err("%s: %s invalid. client_id = %u, dest_id = %u\n",
__func__,
client_id >= APR_CLIENT_MAX ? "Client ID" : "Dest ID",
client_id, dest_id);
rc = -EINVAL;
goto exit;
}
if (!client[dest_id][client_id].handle) {
pr_err("%s: Client handle is NULL\n", __func__);
rc = -EINVAL;
goto exit;
}
rc = apr_tal_start_rx_rt(client[dest_id][client_id].handle);
if (rc)
pr_err("%s: failed to set RT thread priority for APR RX. rc = %d\n",
__func__, rc);
exit:
mutex_unlock(&svc->m_lock);
return rc;
}
EXPORT_SYMBOL(apr_start_rx_rt);
/**
* apr_end_rx_rt - Clients call to unvote for thread
* priority upgrade (perviously voted with
* apr_start_rx_rt()).
*
* @handle: APR service handle
*
* Returns 0 on success or error otherwise.
*/
int apr_end_rx_rt(void *handle)
{
int rc = 0;
struct apr_svc *svc = handle;
uint16_t dest_id = 0;
uint16_t client_id = 0;
if (!svc) {
pr_err("%s: Invalid APR handle\n", __func__);
return -EINVAL;
}
mutex_lock(&svc->m_lock);
dest_id = svc->dest_id;
client_id = svc->client_id;
if ((client_id >= APR_CLIENT_MAX) || (dest_id >= APR_DEST_MAX)) {
pr_err("%s: %s invalid. client_id = %u, dest_id = %u\n",
__func__,
client_id >= APR_CLIENT_MAX ? "Client ID" : "Dest ID",
client_id, dest_id);
rc = -EINVAL;
goto exit;
}
if (!client[dest_id][client_id].handle) {
pr_err("%s: Client handle is NULL\n", __func__);
rc = -EINVAL;
goto exit;
}
rc = apr_tal_end_rx_rt(client[dest_id][client_id].handle);
if (rc)
pr_err("%s: failed to reset RT thread priority for APR RX. rc = %d\n",
__func__, rc);
exit:
mutex_unlock(&svc->m_lock);
return rc;
}
EXPORT_SYMBOL(apr_end_rx_rt);
/**
* apr_deregister - Clients call to de-register
* from APR.

32
ipc/apr_tal_glink.c
View file

@ -357,6 +357,38 @@ unlock:
return rc ? NULL : apr_ch;
}
int apr_tal_start_rx_rt(struct apr_svc_ch_dev *apr_ch)
{
int rc = 0;
if (!apr_ch || !apr_ch->handle) {
rc = -EINVAL;
goto exit;
}
mutex_lock(&apr_ch->m_lock);
rc = glink_start_rx_rt(apr_ch->handle);
mutex_unlock(&apr_ch->m_lock);
exit:
return rc;
}
int apr_tal_end_rx_rt(struct apr_svc_ch_dev *apr_ch)
{
int rc = 0;
if (!apr_ch || !apr_ch->handle) {
rc = -EINVAL;
goto exit;
}
mutex_lock(&apr_ch->m_lock);
rc = glink_end_rx_rt(apr_ch->handle);
mutex_unlock(&apr_ch->m_lock);
exit:
return rc;
}
int apr_tal_close(struct apr_svc_ch_dev *apr_ch)
{
int rc;