[PATCH v6 10/17] scsi: ufs: add retry for query descriptors

[Yaniv Gardi]

Query commands have 100ms timeout and it may timeout if they are
issued in parallel to ongoing read/write SCSI commands, this change
adds the retry (max: 10) in case command timeouts.

Signed-off-by: Subhash Jadavani 
Signed-off-by: Yaniv Gardi 

---
 drivers/scsi/ufs/ufshcd.c | 55 +++
 1 file changed, 37 insertions(+), 18 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index e9c7c91..394054e 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -1875,21 +1875,7 @@ static int ufshcd_query_attr_retry(struct ufs_hba *hba,
return ret;
 }
 
-/**
- * ufshcd_query_descriptor - API function for sending descriptor requests
- * hba: per-adapter instance
- * opcode: attribute opcode
- * idn: attribute idn to access
- * index: index field
- * selector: selector field
- * desc_buf: the buffer that contains the descriptor
- * buf_len: length parameter passed to the device
- *
- * Returns 0 for success, non-zero in case of failure.
- * The buf_len parameter will contain, on return, the length parameter
- * received on the response.
- */
-static int ufshcd_query_descriptor(struct ufs_hba *hba,
+static int __ufshcd_query_descriptor(struct ufs_hba *hba,
enum query_opcode opcode, enum desc_idn idn, u8 index,
u8 selector, u8 *desc_buf, int *buf_len)
 {
@@ -1954,6 +1940,39 @@ out:
 }
 
 /**
+ * ufshcd_query_descriptor_retry - API function for sending descriptor
+ * requests
+ * hba: per-adapter instance
+ * opcode: attribute opcode
+ * idn: attribute idn to access
+ * index: index field
+ * selector: selector field
+ * desc_buf: the buffer that contains the descriptor
+ * buf_len: length parameter passed to the device
+ *
+ * Returns 0 for success, non-zero in case of failure.
+ * The buf_len parameter will contain, on return, the length parameter
+ * received on the response.
+ */
+int ufshcd_query_descriptor_retry(struct ufs_hba *hba,
+   enum query_opcode opcode, enum desc_idn idn, u8 index,
+   u8 selector, u8 *desc_buf, int *buf_len)
+{
+   int err;
+   int retries;
+
+   for (retries = QUERY_REQ_RETRIES; retries > 0; retries--) {
+   err = __ufshcd_query_descriptor(hba, opcode, idn, index,
+   selector, desc_buf, buf_len);
+   if (!err || err == -EINVAL)
+   break;
+   }
+
+   return err;
+}
+EXPORT_SYMBOL(ufshcd_query_descriptor_retry);
+
+/**
  * ufshcd_read_desc_param - read the specified descriptor parameter
  * @hba: Pointer to adapter instance
  * @desc_id: descriptor idn value
@@ -1995,9 +2014,9 @@ static int ufshcd_read_desc_param(struct ufs_hba *hba,
return -ENOMEM;
}
 
-   ret = ufshcd_query_descriptor(hba, UPIU_QUERY_OPCODE_READ_DESC,
- desc_id, desc_index, 0, desc_buf,
- _len);
+   ret = ufshcd_query_descriptor_retry(hba, UPIU_QUERY_OPCODE_READ_DESC,
+   desc_id, desc_index, 0, desc_buf,
+   _len);
 
if (ret || (buff_len < ufs_query_desc_max_size[desc_id]) ||
(desc_buf[QUERY_DESC_LENGTH_OFFSET] !=
-- 
1.8.5.2

-- 
QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member of 
Code Aurora Forum, hosted by The Linux Foundation

[PATCH v6 10/17] scsi: ufs: add retry for query descriptors

[Yaniv Gardi]

Query commands have 100ms timeout and it may timeout if they are
issued in parallel to ongoing read/write SCSI commands, this change
adds the retry (max: 10) in case command timeouts.

Signed-off-by: Subhash Jadavani 
Signed-off-by: Yaniv Gardi 

---
 drivers/scsi/ufs/ufshcd.c | 55 +++
 1 file changed, 37 insertions(+), 18 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index e9c7c91..394054e 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -1875,21 +1875,7 @@ static int ufshcd_query_attr_retry(struct ufs_hba *hba,
return ret;
 }
 
-/**
- * ufshcd_query_descriptor - API function for sending descriptor requests
- * hba: per-adapter instance
- * opcode: attribute opcode
- * idn: attribute idn to access
- * index: index field
- * selector: selector field
- * desc_buf: the buffer that contains the descriptor
- * buf_len: length parameter passed to the device
- *
- * Returns 0 for success, non-zero in case of failure.
- * The buf_len parameter will contain, on return, the length parameter
- * received on the response.
- */
-static int ufshcd_query_descriptor(struct ufs_hba *hba,
+static int __ufshcd_query_descriptor(struct ufs_hba *hba,
enum query_opcode opcode, enum desc_idn idn, u8 index,
u8 selector, u8 *desc_buf, int *buf_len)
 {
@@ -1954,6 +1940,39 @@ out:
 }
 
 /**
+ * ufshcd_query_descriptor_retry - API function for sending descriptor
+ * requests
+ * hba: per-adapter instance
+ * opcode: attribute opcode
+ * idn: attribute idn to access
+ * index: index field
+ * selector: selector field
+ * desc_buf: the buffer that contains the descriptor
+ * buf_len: length parameter passed to the device
+ *
+ * Returns 0 for success, non-zero in case of failure.
+ * The buf_len parameter will contain, on return, the length parameter
+ * received on the response.
+ */
+int ufshcd_query_descriptor_retry(struct ufs_hba *hba,
+   enum query_opcode opcode, enum desc_idn idn, u8 index,
+   u8 selector, u8 *desc_buf, int *buf_len)
+{
+   int err;
+   int retries;
+
+   for (retries = QUERY_REQ_RETRIES; retries > 0; retries--) {
+   err = __ufshcd_query_descriptor(hba, opcode, idn, index,
+   selector, desc_buf, buf_len);
+   if (!err || err == -EINVAL)
+   break;
+   }
+
+   return err;
+}
+EXPORT_SYMBOL(ufshcd_query_descriptor_retry);
+
+/**
  * ufshcd_read_desc_param - read the specified descriptor parameter
  * @hba: Pointer to adapter instance
  * @desc_id: descriptor idn value
@@ -1995,9 +2014,9 @@ static int ufshcd_read_desc_param(struct ufs_hba *hba,
return -ENOMEM;
}
 
-   ret = ufshcd_query_descriptor(hba, UPIU_QUERY_OPCODE_READ_DESC,
- desc_id, desc_index, 0, desc_buf,
- _len);
+   ret = ufshcd_query_descriptor_retry(hba, UPIU_QUERY_OPCODE_READ_DESC,
+   desc_id, desc_index, 0, desc_buf,
+   _len);
 
if (ret || (buff_len < ufs_query_desc_max_size[desc_id]) ||
(desc_buf[QUERY_DESC_LENGTH_OFFSET] !=
-- 
1.8.5.2

-- 
QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member of 
Code Aurora Forum, hosted by The Linux Foundation