[PATCH v2 1/2] scsi: ufs: Add the aggregated read query opcode and its reply format

[Hyeoncheol Jeong <hyenc.jeong@samsung.com>]

UFS 5.0 adds the AGGREGATED READ query opcode (0x9): a single QUERY
RESPONSE UPIU returns many descriptors, attributes and flags as a chain
of typed groups (JESD220H 10.7.9.14).

Add the AGGREGATION TYPE mask, the group types and the group header, and
let ufshcd_copy_query_response() copy the reply's data segment like a
descriptor read, recording its length in struct ufs_query_res.

Signed-off-by: Hyeoncheol Jeong <hyenc.jeong@samsung.com>
---
 drivers/ufs/core/ufshcd.c |  7 +++++--
 include/ufs/ufs.h         | 44 +++++++++++++++++++++++++++++++++++++++
 include/ufs/ufshcd.h      |  2 ++
 3 files changed, 51 insertions(+), 2 deletions(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 54f4e7d7de02..d07834fc4646 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -2473,10 +2473,13 @@ int ufshcd_copy_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
 	struct ufs_query_res *query_res = &hba->dev_cmd.query.response;
 
 	memcpy(&query_res->upiu_res, &lrbp->ucd_rsp_ptr->qr, QUERY_OSF_SIZE);
+	query_res->data_segment_length =
+		be16_to_cpu(lrbp->ucd_rsp_ptr->header.data_segment_length);
 
-	/* Get the descriptor */
+	/* Get the descriptor or aggregated data packet */
 	if (hba->dev_cmd.query.descriptor &&
-	    lrbp->ucd_rsp_ptr->qr.opcode == UPIU_QUERY_OPCODE_READ_DESC) {
+	    (lrbp->ucd_rsp_ptr->qr.opcode == UPIU_QUERY_OPCODE_READ_DESC ||
+	     lrbp->ucd_rsp_ptr->qr.opcode == UPIU_QUERY_OPCODE_AGGREGATED_READ)) {
 		u8 *descp = (u8 *)lrbp->ucd_rsp_ptr +
 				GENERAL_UPIU_REQUEST_SIZE;
 		u16 resp_len;
diff --git a/include/ufs/ufs.h b/include/ufs/ufs.h
index afbb32654fab..1e6ea87a5dc7 100644
--- a/include/ufs/ufs.h
+++ b/include/ufs/ufs.h
@@ -30,6 +30,7 @@ static_assert(sizeof(struct utp_upiu_query) == 20);
  * (ALIGNED_DEVMAN_RSP_SIZE) minus the fixed UPIU header it follows.
  */
 #define QUERY_AGGREGATED_MAX_SIZE (4096 - GENERAL_UPIU_REQUEST_SIZE)
+#define QUERY_AGG_GROUP_HDR_SIZE  4
 #define QUERY_DESC_MIN_SIZE       2
 #define QUERY_DESC_HDR_SIZE       2
 #define QUERY_OSF_SIZE            (GENERAL_UPIU_REQUEST_SIZE - \
@@ -569,6 +570,49 @@ enum ufs_dev_pwr_mode {
 
 #define UFS_WB_BUF_REMAIN_PERCENT(val) ((val) / 10)
 
+/* AGGREGATION TYPE field of an AGGREGATED READ query request */
+enum ufs_agg_type {
+	UFS_AGG_TYPE_ALL_FLAGS			= BIT(0),
+	UFS_AGG_TYPE_ALL_ATTRS			= BIT(1),
+	UFS_AGG_TYPE_DEVICE_DESC		= BIT(2),
+	/* Unit descriptors and the RPMB unit descriptor */
+	UFS_AGG_TYPE_UNIT_RPMB_DESC		= BIT(3),
+	UFS_AGG_TYPE_INTERCONNECT_DESC	= BIT(4),
+	UFS_AGG_TYPE_STRING_DESC		= BIT(5),
+	/* Geometry descriptor and power descriptor */
+	UFS_AGG_TYPE_GEOMETRY_POWER_DESC	= BIT(6),
+	UFS_AGG_TYPE_HEALTH_DESC		= BIT(7),
+};
+
+/* Group Type field of an aggregated data packet group header. */
+enum ufs_agg_group_type {
+	UFS_AGG_GROUP_RESERVED		= 0x00,
+	UFS_AGG_GROUP_FLAGS		= 0x01,
+	UFS_AGG_GROUP_ATTRS		= 0x02,
+	/* Any descriptor with a unique IDN, i.e. all but the string ones */
+	UFS_AGG_GROUP_DESCS		= 0x03,
+	UFS_AGG_GROUP_MANUFACTURER_STR	= 0x04,
+	UFS_AGG_GROUP_PRODUCT_NAME_STR	= 0x05,
+	UFS_AGG_GROUP_OEM_ID_STR	= 0x06,
+	UFS_AGG_GROUP_SERIAL_NUMBER_STR	= 0x07,
+	UFS_AGG_GROUP_PRODUCT_REV_STR	= 0x08,
+};
+
+/**
+ * struct utp_agg_group_header - aggregated data packet group header
+ * @group_type: type of the data carried by this group, see ufs_agg_group_type
+ * @reserved: reserved
+ * @next_group_offset: byte offset from the start of the packet to the next
+ *	group; zero ends the chain
+ */
+struct utp_agg_group_header {
+	u8 group_type;
+	u8 reserved;
+	__be16 next_group_offset;
+};
+
+static_assert(sizeof(struct utp_agg_group_header) == QUERY_AGG_GROUP_HDR_SIZE);
+
 /**
  * struct utp_cmd_rsp - RESPONSE UPIU structure
  * @residual_transfer_count: Residual transfer count DW-3
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index dfd302f2dc7c..1a5e181ff9e3 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -213,9 +213,11 @@ struct ufs_query_req {
 /**
  * struct ufs_query_res - UPIU QUERY
  * @upiu_res: query response data
+ * @data_segment_length: response data segment length
  */
 struct ufs_query_res {
 	struct utp_upiu_query upiu_res;
+	u16 data_segment_length;
 };
 
 /**
-- 
2.25.1