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bus: mhi: core: Remove the system error worker thread

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Remove the system error worker thread and instead have the
execution environment worker handle that transition to serialize
processing and avoid any possible race conditions during
shutdown.

Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20200521170249.21795-10-manivannan.sadhasivam@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hemant Kumar 2020-05-21 22:32:44 +05:30 committed by Greg Kroah-Hartman
parent 0ab9fcd0e7
commit bc7ccce5a5
5 changed files with 20 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/bus/mhi/core/init.c
View File

@ -34,6 +34,7 @@ const char * const dev_state_tran_str[DEV_ST_TRANSITION_MAX] = {
[DEV_ST_TRANSITION_READY] = "READY",
[DEV_ST_TRANSITION_SBL] = "SBL",
[DEV_ST_TRANSITION_MISSION_MODE] = "MISSION_MODE",
[DEV_ST_TRANSITION_SYS_ERR] = "SYS_ERR",
};
const char * const mhi_state_str[MHI_STATE_MAX] = {
@ -834,7 +835,6 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl,
spin_lock_init(&mhi_cntrl->transition_lock);
spin_lock_init(&mhi_cntrl->wlock);
INIT_WORK(&mhi_cntrl->st_worker, mhi_pm_st_worker);
INIT_WORK(&mhi_cntrl->syserr_worker, mhi_pm_sys_err_worker);
init_waitqueue_head(&mhi_cntrl->state_event);
mhi_cmd = mhi_cntrl->mhi_cmd;

3
drivers/bus/mhi/core/internal.h
View File

@ -386,6 +386,7 @@ enum dev_st_transition {
DEV_ST_TRANSITION_READY,
DEV_ST_TRANSITION_SBL,
DEV_ST_TRANSITION_MISSION_MODE,
DEV_ST_TRANSITION_SYS_ERR,
DEV_ST_TRANSITION_MAX,
};
@ -587,7 +588,7 @@ enum mhi_ee_type mhi_get_exec_env(struct mhi_controller *mhi_cntrl);
int mhi_queue_state_transition(struct mhi_controller *mhi_cntrl,
enum dev_st_transition state);
void mhi_pm_st_worker(struct work_struct *work);
void mhi_pm_sys_err_worker(struct work_struct *work);
void mhi_pm_sys_err_handler(struct mhi_controller *mhi_cntrl);
void mhi_fw_load_worker(struct work_struct *work);
int mhi_ready_state_transition(struct mhi_controller *mhi_cntrl);
void mhi_ctrl_ev_task(unsigned long data);

6
drivers/bus/mhi/core/main.c
View File

@ -406,7 +406,7 @@ irqreturn_t mhi_intvec_threaded_handler(int irq_number, void *dev)
if (MHI_IN_PBL(ee))
mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_FATAL_ERROR);
else
schedule_work(&mhi_cntrl->syserr_worker);
mhi_pm_sys_err_handler(mhi_cntrl);
}
exit_intvec:
@ -734,7 +734,7 @@ int mhi_process_ctrl_ev_ring(struct mhi_controller *mhi_cntrl,
MHI_PM_SYS_ERR_DETECT);
write_unlock_irq(&mhi_cntrl->pm_lock);
if (new_state == MHI_PM_SYS_ERR_DETECT)
schedule_work(&mhi_cntrl->syserr_worker);
mhi_pm_sys_err_handler(mhi_cntrl);
break;
}
default:
@ -920,7 +920,7 @@ void mhi_ctrl_ev_task(unsigned long data)
}
write_unlock_irq(&mhi_cntrl->pm_lock);
if (pm_state == MHI_PM_SYS_ERR_DETECT)
schedule_work(&mhi_cntrl->syserr_worker);
mhi_pm_sys_err_handler(mhi_cntrl);
}
}

32
drivers/bus/mhi/core/pm.c
View File

@ -449,19 +449,8 @@ static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl,
to_mhi_pm_state_str(transition_state));
/* We must notify MHI control driver so it can clean up first */
if (transition_state == MHI_PM_SYS_ERR_PROCESS) {
/*
* If controller supports RDDM, we do not process
* SYS error state, instead we will jump directly
* to RDDM state
*/
if (mhi_cntrl->rddm_image) {
dev_dbg(dev,
"Controller supports RDDM, so skip SYS_ERR\n");
return;
}
if (transition_state == MHI_PM_SYS_ERR_PROCESS)
mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_SYS_ERROR);
}
mutex_lock(&mhi_cntrl->pm_mutex);
write_lock_irq(&mhi_cntrl->pm_lock);
@ -527,7 +516,6 @@ static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl,
mutex_unlock(&mhi_cntrl->pm_mutex);
dev_dbg(dev, "Waiting for all pending threads to complete\n");
wake_up_all(&mhi_cntrl->state_event);
flush_work(&mhi_cntrl->st_worker);
dev_dbg(dev, "Reset all active channels and remove MHI devices\n");
device_for_each_child(mhi_cntrl->cntrl_dev, NULL, mhi_destroy_device);
@ -607,13 +595,17 @@ int mhi_queue_state_transition(struct mhi_controller *mhi_cntrl,
}
/* SYS_ERR worker */
void mhi_pm_sys_err_worker(struct work_struct *work)
void mhi_pm_sys_err_handler(struct mhi_controller *mhi_cntrl)
{
struct mhi_controller *mhi_cntrl = container_of(work,
struct mhi_controller,
syserr_worker);
struct device *dev = &mhi_cntrl->mhi_dev->dev;
mhi_pm_disable_transition(mhi_cntrl, MHI_PM_SYS_ERR_PROCESS);
/* skip if controller supports RDDM */
if (mhi_cntrl->rddm_image) {
dev_dbg(dev, "Controller supports RDDM, skip SYS_ERROR\n");
return;
}
mhi_queue_state_transition(mhi_cntrl, DEV_ST_TRANSITION_SYS_ERR);
}
/* Device State Transition worker */
@ -661,6 +653,10 @@ void mhi_pm_st_worker(struct work_struct *work)
case DEV_ST_TRANSITION_READY:
mhi_ready_state_transition(mhi_cntrl);
break;
case DEV_ST_TRANSITION_SYS_ERR:
mhi_pm_disable_transition
(mhi_cntrl, MHI_PM_SYS_ERR_PROCESS);
break;
default:
break;
}

2
include/linux/mhi.h
View File

@ -331,7 +331,6 @@ struct mhi_controller_config {
* @wlock: Lock for protecting device wakeup
* @mhi_link_info: Device bandwidth info
* @st_worker: State transition worker
* @syserr_worker: System error worker
* @state_event: State change event
* @status_cb: CB function to notify power states of the device (required)
* @wake_get: CB function to assert device wake (optional)
@ -411,7 +410,6 @@ struct mhi_controller {
spinlock_t wlock;
struct mhi_link_info mhi_link_info;
struct work_struct st_worker;
struct work_struct syserr_worker;
wait_queue_head_t state_event;
void (*status_cb)(struct mhi_controller *mhi_cntrl,