[PATCH v7 6/7] ufs: mcq: Use ufshcd_mcq_poll_cqe_lock() in mcq mode

Bao D. Nguyen
2023-05-29T22:14:13Z

In preparation for adding mcq error handler support, update the mcq
code to use the ufshcd_mcq_poll_cqe_lock() in interrupt context
instead of using ufshcd_mcq_poll_cqe_nolock(). This is to keep
synchronization between mcq interrupt and error handler contexts
because both need to access the mcq hardware in separate contexts.

Signed-off-by: Bao D. Nguyen <quic_nguyenb@quicinc.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
---
drivers/ufs/core/ufs-mcq.c | 6 +++---
drivers/ufs/core/ufshcd-priv.h | 2 --
drivers/ufs/core/ufshcd.c | 2 +-
drivers/ufs/host/ufs-qcom.c | 2 +-
include/ufs/ufshcd.h | 2 +-
5 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index 63db20b..2efa012 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -284,8 +284,8 @@ static void ufshcd_mcq_process_cqe(struct ufs_hba *hba,
ufshcd_compl_one_cqe(hba, tag, cqe);
}

-unsigned long ufshcd_mcq_poll_cqe_nolock(struct ufs_hba *hba,
- struct ufs_hw_queue *hwq)
+static unsigned long ufshcd_mcq_poll_cqe_nolock(struct ufs_hba *hba,
+ struct ufs_hw_queue *hwq)
{
unsigned long completed_reqs = 0;

@@ -301,7 +301,6 @@ unsigned long ufshcd_mcq_poll_cqe_nolock(struct ufs_hba *hba,

return completed_reqs;
}
-EXPORT_SYMBOL_GPL(ufshcd_mcq_poll_cqe_nolock);

unsigned long ufshcd_mcq_poll_cqe_lock(struct ufs_hba *hba,
struct ufs_hw_queue *hwq)
@@ -314,6 +313,7 @@ unsigned long ufshcd_mcq_poll_cqe_lock(struct ufs_hba *hba,

return completed_reqs;
}
+EXPORT_SYMBOL_GPL(ufshcd_mcq_poll_cqe_lock);

void ufshcd_mcq_make_queues_operational(struct ufs_hba *hba)
{
diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
index 80293fd..339ab51 100644
--- a/drivers/ufs/core/ufshcd-priv.h
+++ b/drivers/ufs/core/ufshcd-priv.h
@@ -71,8 +71,6 @@ void ufshcd_mcq_config_mac(struct ufs_hba *hba, u32 max_active_cmds);
void ufshcd_mcq_select_mcq_mode(struct ufs_hba *hba);
u32 ufshcd_mcq_read_cqis(struct ufs_hba *hba, int i);
void ufshcd_mcq_write_cqis(struct ufs_hba *hba, u32 val, int i);
-unsigned long ufshcd_mcq_poll_cqe_nolock(struct ufs_hba *hba,
- struct ufs_hw_queue *hwq);
struct ufs_hw_queue *ufshcd_mcq_req_to_hwq(struct ufs_hba *hba,
struct request *req);
unsigned long ufshcd_mcq_poll_cqe_lock(struct ufs_hba *hba,
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index dfb6cd4..69562c4 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -6811,7 +6811,7 @@ static irqreturn_t ufshcd_handle_mcq_cq_events(struct ufs_hba *hba)
ufshcd_mcq_write_cqis(hba, events, i);

if (events & UFSHCD_MCQ_CQIS_TAIL_ENT_PUSH_STS)
- ufshcd_mcq_poll_cqe_nolock(hba, hwq);
+ ufshcd_mcq_poll_cqe_lock(hba, hwq);
}

return IRQ_HANDLED;
diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 82d02e7..57f5674 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -1556,7 +1556,7 @@ static irqreturn_t ufs_qcom_mcq_esi_handler(int irq, void *__hba)
struct ufs_hw_queue *hwq = &hba->uhq[id];

ufshcd_mcq_write_cqis(hba, 0x1, id);
- ufshcd_mcq_poll_cqe_nolock(hba, hwq);
+ ufshcd_mcq_poll_cqe_lock(hba, hwq);

return IRQ_HANDLED;
}
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index 3c9ecda..dd74896 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -1244,7 +1244,7 @@ void ufshcd_update_evt_hist(struct ufs_hba *hba, u32 id, u32 val);
void ufshcd_hba_stop(struct ufs_hba *hba);
void ufshcd_schedule_eh_work(struct ufs_hba *hba);
void ufshcd_mcq_write_cqis(struct ufs_hba *hba, u32 val, int i);
-unsigned long ufshcd_mcq_poll_cqe_nolock(struct ufs_hba *hba,
+unsigned long ufshcd_mcq_poll_cqe_lock(struct ufs_hba *hba,
struct ufs_hw_queue *hwq);
void ufshcd_mcq_enable_esi(struct ufs_hba *hba);
void ufshcd_mcq_config_esi(struct ufs_hba *hba, struct msi_msg *msg);
--
2.7.4