[PATCH v4 11/16] ufs: core: Prepare ufshcd_send_command for mcq

Asutosh Das
2022-11-09T19:46:00Z

Add support to send commands using multiple submission
queues in MCQ mode.
Modify the functions that use ufshcd_send_command().

Co-developed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
---
drivers/ufs/core/ufs-mcq.c | 1 +
drivers/ufs/core/ufshcd-priv.h | 10 ++++++++++
drivers/ufs/core/ufshcd.c | 36 ++++++++++++++++++++++++++----------
include/ufs/ufshcd.h | 5 +++++
4 files changed, 42 insertions(+), 10 deletions(-)

diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index c0fd5c0..28f217e 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -393,6 +393,7 @@ int ufshcd_mcq_init(struct ufs_hba *hba)
for (i = 0; i < hba->nr_hw_queues; i++) {
hwq = &hba->uhq[i];
hwq->max_entries = hba->nutrs;
+ spin_lock_init(&hwq->sq_lock);
}

/* The very first HW queue serves device commands */
diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
index 08963e1..5616047 100644
--- a/drivers/ufs/core/ufshcd-priv.h
+++ b/drivers/ufs/core/ufshcd-priv.h
@@ -324,4 +324,14 @@ static inline bool ufs_is_valid_unit_desc_lun(struct ufs_dev_info *dev_info, u8
return lun == UFS_UPIU_RPMB_WLUN || (lun < dev_info->max_lu_supported);
}

+static inline void ufshcd_inc_sq_tail(struct ufs_hw_queue *q)
+{
+ u32 mask = q->max_entries - 1;
+ u32 val;
+
+ q->sq_tail_slot = (q->sq_tail_slot + 1) & mask;
+ val = q->sq_tail_slot * sizeof(struct utp_transfer_req_desc);
+ writel(val, q->mcq_sq_tail);
+}
+
#endif /* _UFSHCD_PRIV_H_ */
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 95f1bb8..12c59fa 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -2182,9 +2182,11 @@ static void ufshcd_update_monitor(struct ufs_hba *hba, const struct ufshcd_lrb *
* ufshcd_send_command - Send SCSI or device management commands
* @hba: per adapter instance
* @task_tag: Task tag of the command
+ * @hwq: pointer to hardware queue instance
*/
static inline
-void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag)
+void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag,
+ struct ufs_hw_queue *hwq)
{
struct ufshcd_lrb *lrbp = &hba->lrb[task_tag];
unsigned long flags;
@@ -2198,12 +2200,24 @@ void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag)
if (unlikely(ufshcd_should_inform_monitor(hba, lrbp)))
ufshcd_start_monitor(hba, lrbp);

- spin_lock_irqsave(&hba->outstanding_lock, flags);
- if (hba->vops && hba->vops->setup_xfer_req)
- hba->vops->setup_xfer_req(hba, task_tag, !!lrbp->cmd);
- __set_bit(task_tag, &hba->outstanding_reqs);
- ufshcd_writel(hba, 1 << task_tag, REG_UTP_TRANSFER_REQ_DOOR_BELL);
- spin_unlock_irqrestore(&hba->outstanding_lock, flags);
+ if (is_mcq_enabled(hba)) {
+ int utrd_size = sizeof(struct utp_transfer_req_desc);
+
+ spin_lock(&hwq->sq_lock);
+ memcpy(hwq->sqe_base_addr + (hwq->sq_tail_slot * utrd_size),
+ lrbp->utr_descriptor_ptr, utrd_size);
+ ufshcd_inc_sq_tail(hwq);
+ spin_unlock(&hwq->sq_lock);
+ } else {
+ spin_lock_irqsave(&hba->outstanding_lock, flags);
+ if (hba->vops && hba->vops->setup_xfer_req)
+ hba->vops->setup_xfer_req(hba, lrbp->task_tag,
+ !!lrbp->cmd);
+ __set_bit(lrbp->task_tag, &hba->outstanding_reqs);
+ ufshcd_writel(hba, 1 << lrbp->task_tag,
+ REG_UTP_TRANSFER_REQ_DOOR_BELL);
+ spin_unlock_irqrestore(&hba->outstanding_lock, flags);
+ }
}

/**
@@ -2822,6 +2836,7 @@ static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
int tag = scsi_cmd_to_rq(cmd)->tag;
struct ufshcd_lrb *lrbp;
int err = 0;
+ struct ufs_hw_queue *hwq = NULL;

WARN_ONCE(tag < 0 || tag >= hba->nutrs, "Invalid tag %d\n", tag);

@@ -2906,7 +2921,7 @@ static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
goto out;
}

- ufshcd_send_command(hba, tag);
+ ufshcd_send_command(hba, tag, hwq);

out:
rcu_read_unlock();
@@ -3101,10 +3116,11 @@ static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
goto out;

hba->dev_cmd.complete = &wait;
+ hba->dev_cmd.cqe = NULL;

ufshcd_add_query_upiu_trace(hba, UFS_QUERY_SEND, lrbp->ucd_req_ptr);

- ufshcd_send_command(hba, tag);
+ ufshcd_send_command(hba, tag, hba->dev_cmd_queue);
err = ufshcd_wait_for_dev_cmd(hba, lrbp, timeout);
ufshcd_add_query_upiu_trace(hba, err ? UFS_QUERY_ERR : UFS_QUERY_COMP,
(struct utp_upiu_req *)lrbp->ucd_rsp_ptr);
@@ -6926,7 +6942,7 @@ static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba,

ufshcd_add_query_upiu_trace(hba, UFS_QUERY_SEND, lrbp->ucd_req_ptr);

- ufshcd_send_command(hba, tag);
+ ufshcd_send_command(hba, tag, hba->dev_cmd_queue);
/*
* ignore the returning value here - ufshcd_check_query_response is
* bound to fail since dev_cmd.query and dev_cmd.type were left empty.
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index 76972fc..853c525 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -222,6 +222,7 @@ struct ufs_dev_cmd {
struct mutex lock;
struct completion *complete;
struct ufs_query query;
+ struct cq_entry *cqe;
};

/**
@@ -1061,6 +1062,8 @@ struct ufs_hba {
* @cqe_dma_addr: completion queue dma address
* @max_entries: max number of slots in this hardware queue
* @id: hardware queue ID
+ * @sq_tp_slot: current slot to which SQ tail pointer is pointing
+ * @sq_lock: serialize submission queue access
*/
struct ufs_hw_queue {
void __iomem *mcq_sq_head;
@@ -1074,6 +1077,8 @@ struct ufs_hw_queue {
dma_addr_t cqe_dma_addr;
u32 max_entries;
u32 id;
+ u32 sq_tail_slot;
+ spinlock_t sq_lock;
};

static inline bool is_mcq_enabled(struct ufs_hba *hba)
--
2.7.4