227 lines
5.1 KiB
C
227 lines
5.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* bsg endpoint that supports UPIUs
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*
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* Copyright (C) 2018 Western Digital Corporation
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*/
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#include "ufs_bsg.h"
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static int ufs_bsg_get_query_desc_size(struct ufs_hba *hba, int *desc_len,
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struct utp_upiu_query *qr)
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{
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int desc_size = be16_to_cpu(qr->length);
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int desc_id = qr->idn;
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int ret;
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if (desc_size <= 0)
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return -EINVAL;
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ret = ufshcd_map_desc_id_to_length(hba, desc_id, desc_len);
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if (ret || !*desc_len)
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return -EINVAL;
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*desc_len = min_t(int, *desc_len, desc_size);
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return 0;
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}
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static int ufs_bsg_verify_query_size(struct ufs_hba *hba,
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unsigned int request_len,
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unsigned int reply_len)
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{
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int min_req_len = sizeof(struct ufs_bsg_request);
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int min_rsp_len = sizeof(struct ufs_bsg_reply);
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if (min_req_len > request_len || min_rsp_len > reply_len) {
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dev_err(hba->dev, "not enough space assigned\n");
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return -EINVAL;
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}
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return 0;
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}
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static int ufs_bsg_alloc_desc_buffer(struct ufs_hba *hba, struct bsg_job *job,
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uint8_t **desc_buff, int *desc_len,
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enum query_opcode desc_op)
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{
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struct ufs_bsg_request *bsg_request = job->request;
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struct utp_upiu_query *qr;
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u8 *descp;
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if (desc_op != UPIU_QUERY_OPCODE_WRITE_DESC &&
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desc_op != UPIU_QUERY_OPCODE_READ_DESC)
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goto out;
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qr = &bsg_request->upiu_req.qr;
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if (ufs_bsg_get_query_desc_size(hba, desc_len, qr)) {
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dev_err(hba->dev, "Illegal desc size\n");
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return -EINVAL;
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}
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if (*desc_len > job->request_payload.payload_len) {
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dev_err(hba->dev, "Illegal desc size\n");
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return -EINVAL;
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}
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descp = kzalloc(*desc_len, GFP_KERNEL);
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if (!descp)
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return -ENOMEM;
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if (desc_op == UPIU_QUERY_OPCODE_WRITE_DESC)
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sg_copy_to_buffer(job->request_payload.sg_list,
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job->request_payload.sg_cnt, descp,
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*desc_len);
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*desc_buff = descp;
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out:
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return 0;
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}
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static int ufs_bsg_request(struct bsg_job *job)
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{
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struct ufs_bsg_request *bsg_request = job->request;
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struct ufs_bsg_reply *bsg_reply = job->reply;
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struct ufs_hba *hba = shost_priv(dev_to_shost(job->dev->parent));
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unsigned int req_len = job->request_len;
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unsigned int reply_len = job->reply_len;
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struct uic_command uc = {};
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int msgcode;
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uint8_t *desc_buff = NULL;
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int desc_len = 0;
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enum query_opcode desc_op = UPIU_QUERY_OPCODE_NOP;
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int ret;
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ret = ufs_bsg_verify_query_size(hba, req_len, reply_len);
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if (ret)
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goto out;
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bsg_reply->reply_payload_rcv_len = 0;
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pm_runtime_get_sync(hba->dev);
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msgcode = bsg_request->msgcode;
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switch (msgcode) {
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case UPIU_TRANSACTION_QUERY_REQ:
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desc_op = bsg_request->upiu_req.qr.opcode;
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ret = ufs_bsg_alloc_desc_buffer(hba, job, &desc_buff,
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&desc_len, desc_op);
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if (ret)
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goto out;
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/* fall through */
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case UPIU_TRANSACTION_NOP_OUT:
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case UPIU_TRANSACTION_TASK_REQ:
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ret = ufshcd_exec_raw_upiu_cmd(hba, &bsg_request->upiu_req,
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&bsg_reply->upiu_rsp, msgcode,
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desc_buff, &desc_len, desc_op);
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if (ret)
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dev_err(hba->dev,
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"exe raw upiu: error code %d\n", ret);
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break;
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case UPIU_TRANSACTION_UIC_CMD:
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memcpy(&uc, &bsg_request->upiu_req.uc, UIC_CMD_SIZE);
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ret = ufshcd_send_uic_cmd(hba, &uc);
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if (ret)
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dev_err(hba->dev,
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"send uic cmd: error code %d\n", ret);
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memcpy(&bsg_reply->upiu_rsp.uc, &uc, UIC_CMD_SIZE);
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break;
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default:
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ret = -ENOTSUPP;
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dev_err(hba->dev, "unsupported msgcode 0x%x\n", msgcode);
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break;
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}
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pm_runtime_put_sync(hba->dev);
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if (!desc_buff)
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goto out;
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if (desc_op == UPIU_QUERY_OPCODE_READ_DESC && desc_len)
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bsg_reply->reply_payload_rcv_len =
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sg_copy_from_buffer(job->request_payload.sg_list,
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job->request_payload.sg_cnt,
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desc_buff, desc_len);
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kfree(desc_buff);
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out:
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bsg_reply->result = ret;
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job->reply_len = sizeof(struct ufs_bsg_reply);
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/* complete the job here only if no error */
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if (ret == 0)
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bsg_job_done(job, ret, bsg_reply->reply_payload_rcv_len);
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return ret;
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}
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/**
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* ufs_bsg_remove - detach and remove the added ufs-bsg node
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* @hba: per adapter object
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*
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* Should be called when unloading the driver.
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*/
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void ufs_bsg_remove(struct ufs_hba *hba)
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{
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struct device *bsg_dev = &hba->bsg_dev;
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if (!hba->bsg_queue)
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return;
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bsg_remove_queue(hba->bsg_queue);
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device_del(bsg_dev);
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put_device(bsg_dev);
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}
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static inline void ufs_bsg_node_release(struct device *dev)
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{
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put_device(dev->parent);
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}
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/**
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* ufs_bsg_probe - Add ufs bsg device node
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* @hba: per adapter object
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*
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* Called during initial loading of the driver, and before scsi_scan_host.
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*/
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int ufs_bsg_probe(struct ufs_hba *hba)
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{
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struct device *bsg_dev = &hba->bsg_dev;
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struct Scsi_Host *shost = hba->host;
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struct device *parent = &shost->shost_gendev;
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struct request_queue *q;
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int ret;
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device_initialize(bsg_dev);
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bsg_dev->parent = get_device(parent);
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bsg_dev->release = ufs_bsg_node_release;
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dev_set_name(bsg_dev, "ufs-bsg%u", shost->host_no);
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ret = device_add(bsg_dev);
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if (ret)
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goto out;
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q = bsg_setup_queue(bsg_dev, dev_name(bsg_dev), ufs_bsg_request, NULL, 0);
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if (IS_ERR(q)) {
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ret = PTR_ERR(q);
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goto out;
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}
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hba->bsg_queue = q;
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return 0;
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out:
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dev_err(bsg_dev, "fail to initialize a bsg dev %d\n", shost->host_no);
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put_device(bsg_dev);
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return ret;
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}
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