scsi: ufs-bsg: Add support for raw upiu in ufs_bsg_request()

Do that for the currently supported UPIUs: query, nop out, and task
management.

We do not support UPIU of type scsi command yet, while we are using the
job's request and reply pointers to hold the payload.  We will look into
it in later patches. We might need to elaborate the raw upiu api for
that.

We also still not supporting uic commands: For first phase, we plan to
use the existing api, and send only uic commands that are already
supported. Anyway, all that will come in the next patch.
Signed-off-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <Bart.VanAssche@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ufs/ufs_bsg.c

@@ -6,19 +6,125 @@
  */
 #include "ufs_bsg.h"
 
+static int ufs_bsg_get_query_desc_size(struct ufs_hba *hba, int *desc_len,
+				       struct utp_upiu_query *qr)
+{
+	int desc_size = be16_to_cpu(qr->length);
+	int desc_id = qr->idn;
+	int ret;
+
+	if (desc_size <= 0)
+		return -EINVAL;
+
+	ret = ufshcd_map_desc_id_to_length(hba, desc_id, desc_len);
+	if (ret || !*desc_len)
+		return -EINVAL;
+
+	*desc_len = min_t(int, *desc_len, desc_size);
+
+	return 0;
+}
+
+static int ufs_bsg_verify_query_size(struct ufs_hba *hba,
+				     unsigned int request_len,
+				     unsigned int reply_len,
+				     int desc_len, enum query_opcode desc_op)
+{
+	int min_req_len = sizeof(struct ufs_bsg_request);
+	int min_rsp_len = sizeof(struct ufs_bsg_reply);
+
+	if (desc_op == UPIU_QUERY_OPCODE_WRITE_DESC)
+		min_req_len += desc_len;
+
+	if (min_req_len > request_len || min_rsp_len > reply_len) {
+		dev_err(hba->dev, "not enough space assigned\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int ufs_bsg_verify_query_params(struct ufs_hba *hba,
+				       struct ufs_bsg_request *bsg_request,
+				       unsigned int request_len,
+				       unsigned int reply_len,
+				       uint8_t *desc_buff, int *desc_len,
+				       enum query_opcode desc_op)
+{
+	struct utp_upiu_query *qr;
+
+	if (desc_op == UPIU_QUERY_OPCODE_READ_DESC) {
+		dev_err(hba->dev, "unsupported opcode %d\n", desc_op);
+		return -ENOTSUPP;
+	}
+
+	if (desc_op != UPIU_QUERY_OPCODE_WRITE_DESC)
+		goto out;
+
+	qr = &bsg_request->upiu_req.qr;
+	if (ufs_bsg_get_query_desc_size(hba, desc_len, qr)) {
+		dev_err(hba->dev, "Illegal desc size\n");
+		return -EINVAL;
+	}
+
+	if (ufs_bsg_verify_query_size(hba, request_len, reply_len, *desc_len,
+				      desc_op))
+		return -EINVAL;
+
+	desc_buff = (uint8_t *)(bsg_request + 1);
+
+out:
+	return 0;
+}
 
 static int ufs_bsg_request(struct bsg_job *job)
 {
 	struct ufs_bsg_request *bsg_request = job->request;
 	struct ufs_bsg_reply *bsg_reply = job->reply;
-	int ret = -ENOTSUPP;
+	struct ufs_hba *hba = shost_priv(dev_to_shost(job->dev->parent));
+	unsigned int req_len = job->request_len;
+	unsigned int reply_len = job->reply_len;
+	int msgcode;
+	uint8_t *desc_buff = NULL;
+	int desc_len = 0;
+	enum query_opcode desc_op = UPIU_QUERY_OPCODE_NOP;
+	int ret;
+
+	ret = ufs_bsg_verify_query_size(hba, req_len, reply_len, 0, desc_op);
+	if (ret)
+		goto out;
 
 	bsg_reply->reply_payload_rcv_len = 0;
 
-	/* Do Nothing for now */
-	dev_err(job->dev, "unsupported message_code 0x%x\n",
-		bsg_request->msgcode);
+	msgcode = bsg_request->msgcode;
+	switch (msgcode) {
+	case UPIU_TRANSACTION_QUERY_REQ:
+		desc_op = bsg_request->upiu_req.qr.opcode;
+		ret = ufs_bsg_verify_query_params(hba, bsg_request, req_len,
+						  reply_len, desc_buff,
+						  &desc_len, desc_op);
+		if (ret)
+			goto out;
+
+		/* fall through */
+	case UPIU_TRANSACTION_NOP_OUT:
+	case UPIU_TRANSACTION_TASK_REQ:
+		ret = ufshcd_exec_raw_upiu_cmd(hba, &bsg_request->upiu_req,
+					       &bsg_reply->upiu_rsp, msgcode,
+					       desc_buff, &desc_len, desc_op);
+		if (ret)
+			dev_err(hba->dev,
+				"exe raw upiu: error code %d\n", ret);
+
+		break;
+	default:
+		ret = -ENOTSUPP;
+		dev_err(hba->dev, "unsupported msgcode 0x%x\n", msgcode);
 
+		break;
+	}
+
+out:
 	bsg_reply->result = ret;
 	job->reply_len = sizeof(struct ufs_bsg_reply) +
 			 bsg_reply->reply_payload_rcv_len;