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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/ufs/core/ufs_bsg.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/ufs/core/ufs_bsg.c')
-rw-r--r-- | drivers/ufs/core/ufs_bsg.c | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/drivers/ufs/core/ufs_bsg.c b/drivers/ufs/core/ufs_bsg.c new file mode 100644 index 0000000000..374e5aae4e --- /dev/null +++ b/drivers/ufs/core/ufs_bsg.c @@ -0,0 +1,270 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * bsg endpoint that supports UPIUs + * + * Copyright (C) 2018 Western Digital Corporation + */ + +#include <linux/bsg-lib.h> +#include <linux/dma-mapping.h> +#include <scsi/scsi.h> +#include <scsi/scsi_host.h> +#include "ufs_bsg.h" +#include <ufs/ufshcd.h> +#include "ufshcd-priv.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); + + if (desc_size <= 0) + return -EINVAL; + + *desc_len = min_t(int, QUERY_DESC_MAX_SIZE, desc_size); + + return 0; +} + +static int ufs_bsg_alloc_desc_buffer(struct ufs_hba *hba, struct bsg_job *job, + uint8_t **desc_buff, int *desc_len, + enum query_opcode desc_op) +{ + struct ufs_bsg_request *bsg_request = job->request; + struct utp_upiu_query *qr; + u8 *descp; + + if (desc_op != UPIU_QUERY_OPCODE_WRITE_DESC && + desc_op != UPIU_QUERY_OPCODE_READ_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 (*desc_len > job->request_payload.payload_len) { + dev_err(hba->dev, "Illegal desc size\n"); + return -EINVAL; + } + + descp = kzalloc(*desc_len, GFP_KERNEL); + if (!descp) + return -ENOMEM; + + if (desc_op == UPIU_QUERY_OPCODE_WRITE_DESC) + sg_copy_to_buffer(job->request_payload.sg_list, + job->request_payload.sg_cnt, descp, + *desc_len); + + *desc_buff = descp; + +out: + return 0; +} + +static int ufs_bsg_exec_advanced_rpmb_req(struct ufs_hba *hba, struct bsg_job *job) +{ + struct ufs_rpmb_request *rpmb_request = job->request; + struct ufs_rpmb_reply *rpmb_reply = job->reply; + struct bsg_buffer *payload = NULL; + enum dma_data_direction dir; + struct scatterlist *sg_list = NULL; + int rpmb_req_type; + int sg_cnt = 0; + int ret; + int data_len; + + if (hba->ufs_version < ufshci_version(4, 0) || !hba->dev_info.b_advanced_rpmb_en) + return -EINVAL; + + if (rpmb_request->ehs_req.length != 2 || rpmb_request->ehs_req.ehs_type != 1) + return -EINVAL; + + rpmb_req_type = be16_to_cpu(rpmb_request->ehs_req.meta.req_resp_type); + + switch (rpmb_req_type) { + case UFS_RPMB_WRITE_KEY: + case UFS_RPMB_READ_CNT: + case UFS_RPMB_PURGE_ENABLE: + dir = DMA_NONE; + break; + case UFS_RPMB_WRITE: + case UFS_RPMB_SEC_CONF_WRITE: + dir = DMA_TO_DEVICE; + break; + case UFS_RPMB_READ: + case UFS_RPMB_SEC_CONF_READ: + case UFS_RPMB_PURGE_STATUS_READ: + dir = DMA_FROM_DEVICE; + break; + default: + return -EINVAL; + } + + if (dir != DMA_NONE) { + payload = &job->request_payload; + if (!payload || !payload->payload_len || !payload->sg_cnt) + return -EINVAL; + + sg_cnt = dma_map_sg(hba->host->dma_dev, payload->sg_list, payload->sg_cnt, dir); + if (unlikely(!sg_cnt)) + return -ENOMEM; + sg_list = payload->sg_list; + data_len = payload->payload_len; + } + + ret = ufshcd_advanced_rpmb_req_handler(hba, &rpmb_request->bsg_request.upiu_req, + &rpmb_reply->bsg_reply.upiu_rsp, &rpmb_request->ehs_req, + &rpmb_reply->ehs_rsp, sg_cnt, sg_list, dir); + + if (dir != DMA_NONE) { + dma_unmap_sg(hba->host->dma_dev, payload->sg_list, payload->sg_cnt, dir); + + if (!ret) + rpmb_reply->bsg_reply.reply_payload_rcv_len = data_len; + } + + return ret; +} + +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; + struct ufs_hba *hba = shost_priv(dev_to_shost(job->dev->parent)); + struct uic_command uc = {}; + int msgcode; + uint8_t *buff = NULL; + int desc_len = 0; + enum query_opcode desc_op = UPIU_QUERY_OPCODE_NOP; + int ret; + bool rpmb = false; + + bsg_reply->reply_payload_rcv_len = 0; + + ufshcd_rpm_get_sync(hba); + + msgcode = bsg_request->msgcode; + switch (msgcode) { + case UPIU_TRANSACTION_QUERY_REQ: + desc_op = bsg_request->upiu_req.qr.opcode; + ret = ufs_bsg_alloc_desc_buffer(hba, job, &buff, &desc_len, desc_op); + if (ret) + goto out; + fallthrough; + 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, + buff, &desc_len, desc_op); + if (ret) + dev_err(hba->dev, "exe raw upiu: error code %d\n", ret); + else if (desc_op == UPIU_QUERY_OPCODE_READ_DESC && desc_len) { + bsg_reply->reply_payload_rcv_len = + sg_copy_from_buffer(job->request_payload.sg_list, + job->request_payload.sg_cnt, + buff, desc_len); + } + break; + case UPIU_TRANSACTION_UIC_CMD: + memcpy(&uc, &bsg_request->upiu_req.uc, UIC_CMD_SIZE); + ret = ufshcd_send_uic_cmd(hba, &uc); + if (ret) + dev_err(hba->dev, "send uic cmd: error code %d\n", ret); + + memcpy(&bsg_reply->upiu_rsp.uc, &uc, UIC_CMD_SIZE); + + break; + case UPIU_TRANSACTION_ARPMB_CMD: + rpmb = true; + ret = ufs_bsg_exec_advanced_rpmb_req(hba, job); + if (ret) + dev_err(hba->dev, "ARPMB OP failed: error code %d\n", ret); + break; + default: + ret = -ENOTSUPP; + dev_err(hba->dev, "unsupported msgcode 0x%x\n", msgcode); + + break; + } + +out: + ufshcd_rpm_put_sync(hba); + kfree(buff); + bsg_reply->result = ret; + job->reply_len = !rpmb ? sizeof(struct ufs_bsg_reply) : sizeof(struct ufs_rpmb_reply); + /* complete the job here only if no error */ + if (ret == 0) + bsg_job_done(job, ret, bsg_reply->reply_payload_rcv_len); + + return ret; +} + +/** + * ufs_bsg_remove - detach and remove the added ufs-bsg node + * @hba: per adapter object + * + * Should be called when unloading the driver. + */ +void ufs_bsg_remove(struct ufs_hba *hba) +{ + struct device *bsg_dev = &hba->bsg_dev; + + if (!hba->bsg_queue) + return; + + bsg_remove_queue(hba->bsg_queue); + + device_del(bsg_dev); + put_device(bsg_dev); +} + +static inline void ufs_bsg_node_release(struct device *dev) +{ + put_device(dev->parent); +} + +/** + * ufs_bsg_probe - Add ufs bsg device node + * @hba: per adapter object + * + * Called during initial loading of the driver, and before scsi_scan_host. + * + * Returns: 0 (success). + */ +int ufs_bsg_probe(struct ufs_hba *hba) +{ + struct device *bsg_dev = &hba->bsg_dev; + struct Scsi_Host *shost = hba->host; + struct device *parent = &shost->shost_gendev; + struct request_queue *q; + int ret; + + device_initialize(bsg_dev); + + bsg_dev->parent = get_device(parent); + bsg_dev->release = ufs_bsg_node_release; + + dev_set_name(bsg_dev, "ufs-bsg%u", shost->host_no); + + ret = device_add(bsg_dev); + if (ret) + goto out; + + q = bsg_setup_queue(bsg_dev, dev_name(bsg_dev), ufs_bsg_request, NULL, 0); + if (IS_ERR(q)) { + ret = PTR_ERR(q); + goto out; + } + + hba->bsg_queue = q; + + return 0; + +out: + dev_err(bsg_dev, "fail to initialize a bsg dev %d\n", shost->host_no); + put_device(bsg_dev); + return ret; +} |