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drivers: virtio_fastrpc: Add PM notifier to unblock user process

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Add SUSPEND_PREPARE pm notifier to unblock the userspace process.

Change-Id: I784e060bac3a44286e40733f5b9800bfd659ebbc
Signed-off-by: Anuj Garg <anujgarg@codeaurora.org>
This commit is contained in:
Anuj Garg 2021-03-10 15:58:44 +05:30
commit 7deefbd0d6
1 changed files with 60 additions and 0 deletions
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60
drivers/char/virtio_fastrpc.c
View file

@ -22,6 +22,7 @@
#include <linux/virtio.h>
#include <linux/virtio_config.h>
#include <linux/uaccess.h>
#include <linux/suspend.h>
#include <soc/qcom/subsystem_notif.h>
#include <soc/qcom/subsystem_restart.h>
#include "adsprpc_compat.h"
@ -787,6 +788,9 @@ static int virt_fastrpc_invoke(struct fastrpc_file *fl, uint32_t kernel,
wait_for_completion(&msg->work);
rsp = msg->rxbuf;
if (!rsp)
goto bail;
err = rsp->hdr.result;
if (err)
goto bail;
@ -1343,6 +1347,9 @@ static int virt_fastrpc_munmap(struct fastrpc_file *fl, uintptr_t raddr,
wait_for_completion(&msg->work);
rsp = msg->rxbuf;
if (!rsp)
goto bail;
err = rsp->hdr.result;
bail:
if (rsp) {
@ -1516,6 +1523,9 @@ static int virt_fastrpc_mmap(struct fastrpc_file *fl, uint32_t flags,
wait_for_completion(&msg->work);
rsp = msg->rxbuf;
if (!rsp)
goto bail;
err = rsp->hdr.result;
if (err)
goto bail;
@ -1646,6 +1656,9 @@ static int virt_fastrpc_control(struct fastrpc_file *fl,
wait_for_completion(&msg->work);
rsp = msg->rxbuf;
if (!rsp)
goto bail;
err = rsp->hdr.result;
bail:
if (rsp) {
@ -1760,6 +1773,9 @@ static int virt_fastrpc_open(struct fastrpc_file *fl)
wait_for_completion(&msg->work);
rsp = msg->rxbuf;
if (!rsp)
goto bail;
err = rsp->hdr.result;
if (err)
goto bail;
@ -1831,6 +1847,9 @@ static int virt_fastrpc_close(struct fastrpc_file *fl)
wait_for_completion(&msg->work);
rsp = msg->rxbuf;
if (!rsp)
goto bail;
err = rsp->result;
bail:
if (rsp) {
@ -2221,6 +2240,40 @@ vqs_del:
return err;
}
/**
** virtio_fastrpc_pm_notifier() - PM notifier callback function.
** @nb: Pointer to the notifier block.
** @event: Suspend state event from PM module.
** @unused: Null pointer from PM module.
**
** This function is register as callback function to get notifications
** from the PM module on the system suspend state.
**/
static int virtio_fastrpc_pm_notifier(struct notifier_block *nb,
unsigned long event, void *unused)
{
struct fastrpc_apps *me = &gfa;
unsigned long flags;
int i = 0;
struct virt_fastrpc_msg *msg;
if (event == PM_SUSPEND_PREPARE) {
spin_lock_irqsave(&me->msglock, flags);
for (i = 0; i < FASTRPC_MSG_MAX; i++) {
if (me->msgtable[i]) {
msg = me->msgtable[i];
complete(&msg->work);
}
}
spin_unlock_irqrestore(&me->msglock, flags);
}
return NOTIFY_DONE;
}
static struct notifier_block virtio_fastrpc_pm_nb = {
.notifier_call = virtio_fastrpc_pm_notifier,
};
static int virt_fastrpc_probe(struct virtio_device *vdev)
{
struct fastrpc_apps *me = &gfa;
@ -2368,11 +2421,18 @@ static struct virtio_driver virtio_fastrpc_driver = {
static int __init virtio_fastrpc_init(void)
{
int ret;
ret = register_pm_notifier(&virtio_fastrpc_pm_nb);
if (ret)
pr_err("virtio_fastrpc: power state notif error\n");
return register_virtio_driver(&virtio_fastrpc_driver);
}
static void __exit virtio_fastrpc_exit(void)
{
unregister_pm_notifier(&virtio_fastrpc_pm_nb);
unregister_virtio_driver(&virtio_fastrpc_driver);
}
module_init(virtio_fastrpc_init);