diff options
Diffstat (limited to 'drivers/usb/gadget/tcm_usb_gadget.c')
| -rw-r--r-- | drivers/usb/gadget/tcm_usb_gadget.c | 2480 |
1 files changed, 2480 insertions, 0 deletions
diff --git a/drivers/usb/gadget/tcm_usb_gadget.c b/drivers/usb/gadget/tcm_usb_gadget.c new file mode 100644 index 000000000000..c46439c8dd74 --- /dev/null +++ b/drivers/usb/gadget/tcm_usb_gadget.c @@ -0,0 +1,2480 @@ +/* Target based USB-Gadget + * + * UAS protocol handling, target callbacks, configfs handling, + * BBB (USB Mass Storage Class Bulk-Only (BBB) and Transport protocol handling. + * + * Author: Sebastian Andrzej Siewior <bigeasy at linutronix dot de> + * License: GPLv2 as published by FSF. + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/string.h> +#include <linux/configfs.h> +#include <linux/ctype.h> +#include <linux/usb/ch9.h> +#include <linux/usb/composite.h> +#include <linux/usb/gadget.h> +#include <linux/usb/storage.h> +#include <scsi/scsi.h> +#include <scsi/scsi_tcq.h> +#include <target/target_core_base.h> +#include <target/target_core_fabric.h> +#include <target/target_core_fabric_configfs.h> +#include <target/target_core_configfs.h> +#include <target/configfs_macros.h> +#include <asm/unaligned.h> + +#include "usbstring.c" +#include "epautoconf.c" +#include "config.c" +#include "composite.c" + +#include "tcm_usb_gadget.h" + +static struct target_fabric_configfs *usbg_fabric_configfs; + +static inline struct f_uas *to_f_uas(struct usb_function *f) +{ + return container_of(f, struct f_uas, function); +} + +static void usbg_cmd_release(struct kref *); + +static inline void usbg_cleanup_cmd(struct usbg_cmd *cmd) +{ + kref_put(&cmd->ref, usbg_cmd_release); +} + +/* Start bot.c code */ + +static int bot_enqueue_cmd_cbw(struct f_uas *fu) +{ + int ret; + + if (fu->flags & USBG_BOT_CMD_PEND) + return 0; + + ret = usb_ep_queue(fu->ep_out, fu->cmd.req, GFP_ATOMIC); + if (!ret) + fu->flags |= USBG_BOT_CMD_PEND; + return ret; +} + +static void bot_status_complete(struct usb_ep *ep, struct usb_request *req) +{ + struct usbg_cmd *cmd = req->context; + struct f_uas *fu = cmd->fu; + + usbg_cleanup_cmd(cmd); + if (req->status < 0) { + pr_err("ERR %s(%d)\n", __func__, __LINE__); + return; + } + + /* CSW completed, wait for next CBW */ + bot_enqueue_cmd_cbw(fu); +} + +static void bot_enqueue_sense_code(struct f_uas *fu, struct usbg_cmd *cmd) +{ + struct bulk_cs_wrap *csw = &fu->bot_status.csw; + int ret; + u8 *sense; + unsigned int csw_stat; + + csw_stat = cmd->csw_code; + + /* + * We can't send SENSE as a response. So we take ASC & ASCQ from our + * sense buffer and queue it and hope the host sends a REQUEST_SENSE + * command where it learns why we failed. + */ + sense = cmd->sense_iu.sense; + + csw->Tag = cmd->bot_tag; + csw->Status = csw_stat; + fu->bot_status.req->context = cmd; + ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_ATOMIC); + if (ret) + pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret); +} + +static void bot_err_compl(struct usb_ep *ep, struct usb_request *req) +{ + struct usbg_cmd *cmd = req->context; + struct f_uas *fu = cmd->fu; + + if (req->status < 0) + pr_err("ERR %s(%d)\n", __func__, __LINE__); + + if (cmd->data_len) { + if (cmd->data_len > ep->maxpacket) { + req->length = ep->maxpacket; + cmd->data_len -= ep->maxpacket; + } else { + req->length = cmd->data_len; + cmd->data_len = 0; + } + + usb_ep_queue(ep, req, GFP_ATOMIC); + return ; + } + bot_enqueue_sense_code(fu, cmd); +} + +static void bot_send_bad_status(struct usbg_cmd *cmd) +{ + struct f_uas *fu = cmd->fu; + struct bulk_cs_wrap *csw = &fu->bot_status.csw; + struct usb_request *req; + struct usb_ep *ep; + + csw->Residue = cpu_to_le32(cmd->data_len); + + if (cmd->data_len) { + if (cmd->is_read) { + ep = fu->ep_in; + req = fu->bot_req_in; + } else { + ep = fu->ep_out; + req = fu->bot_req_out; + } + + if (cmd->data_len > fu->ep_in->maxpacket) { + req->length = ep->maxpacket; + cmd->data_len -= ep->maxpacket; + } else { + req->length = cmd->data_len; + cmd->data_len = 0; + } + req->complete = bot_err_compl; + req->context = cmd; + req->buf = fu->cmd.buf; + usb_ep_queue(ep, req, GFP_KERNEL); + } else { + bot_enqueue_sense_code(fu, cmd); + } +} + +static int bot_send_status(struct usbg_cmd *cmd, bool moved_data) +{ + struct f_uas *fu = cmd->fu; + struct bulk_cs_wrap *csw = &fu->bot_status.csw; + int ret; + + if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) { + if (!moved_data && cmd->data_len) { + /* + * the host wants to move data, we don't. Fill / empty + * the pipe and then send the csw with reside set. + */ + cmd->csw_code = US_BULK_STAT_OK; + bot_send_bad_status(cmd); + return 0; + } + + csw->Tag = cmd->bot_tag; + csw->Residue = cpu_to_le32(0); + csw->Status = US_BULK_STAT_OK; + fu->bot_status.req->context = cmd; + + ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL); + if (ret) + pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret); + } else { + cmd->csw_code = US_BULK_STAT_FAIL; + bot_send_bad_status(cmd); + } + return 0; +} + +/* + * Called after command (no data transfer) or after the write (to device) + * operation is completed + */ +static int bot_send_status_response(struct usbg_cmd *cmd) +{ + bool moved_data = false; + + if (!cmd->is_read) + moved_data = true; + return bot_send_status(cmd, moved_data); +} + +/* Read request completed, now we have to send the CSW */ +static void bot_read_compl(struct usb_ep *ep, struct usb_request *req) +{ + struct usbg_cmd *cmd = req->context; + + if (req->status < 0) + pr_err("ERR %s(%d)\n", __func__, __LINE__); + + bot_send_status(cmd, true); +} + +static int bot_send_read_response(struct usbg_cmd *cmd) +{ + struct f_uas *fu = cmd->fu; + struct se_cmd *se_cmd = &cmd->se_cmd; + struct usb_gadget *gadget = fuas_to_gadget(fu); + int ret; + + if (!cmd->data_len) { + cmd->csw_code = US_BULK_STAT_PHASE; + bot_send_bad_status(cmd); + return 0; + } + + if (!gadget->sg_supported) { + cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC); + if (!cmd->data_buf) + return -ENOMEM; + + sg_copy_to_buffer(se_cmd->t_data_sg, + se_cmd->t_data_nents, + cmd->data_buf, + se_cmd->data_length); + + fu->bot_req_in->buf = cmd->data_buf; + } else { + fu->bot_req_in->buf = NULL; + fu->bot_req_in->num_sgs = se_cmd->t_data_nents; + fu->bot_req_in->sg = se_cmd->t_data_sg; + } + + fu->bot_req_in->complete = bot_read_compl; + fu->bot_req_in->length = se_cmd->data_length; + fu->bot_req_in->context = cmd; + ret = usb_ep_queue(fu->ep_in, fu->bot_req_in, GFP_ATOMIC); + if (ret) + pr_err("%s(%d)\n", __func__, __LINE__); + return 0; +} + +static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *); +static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *); + +static int bot_send_write_request(struct usbg_cmd *cmd) +{ + struct f_uas *fu = cmd->fu; + struct se_cmd *se_cmd = &cmd->se_cmd; + struct usb_gadget *gadget = fuas_to_gadget(fu); + int ret; + + init_completion(&cmd->write_complete); + cmd->fu = fu; + + if (!cmd->data_len) { + cmd->csw_code = US_BULK_STAT_PHASE; + return -EINVAL; + } + + if (!gadget->sg_supported) { + cmd->data_buf = kmalloc(se_cmd->data_length, GFP_KERNEL); + if (!cmd->data_buf) + return -ENOMEM; + + fu->bot_req_out->buf = cmd->data_buf; + } else { + fu->bot_req_out->buf = NULL; + fu->bot_req_out->num_sgs = se_cmd->t_data_nents; + fu->bot_req_out->sg = se_cmd->t_data_sg; + } + + fu->bot_req_out->complete = usbg_data_write_cmpl; + fu->bot_req_out->length = se_cmd->data_length; + fu->bot_req_out->context = cmd; + + ret = usbg_prepare_w_request(cmd, fu->bot_req_out); + if (ret) + goto cleanup; + ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL); + if (ret) + pr_err("%s(%d)\n", __func__, __LINE__); + + wait_for_completion(&cmd->write_complete); + transport_generic_process_write(se_cmd); +cleanup: + return ret; +} + +static int bot_submit_command(struct f_uas *, void *, unsigned int); + +static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req) +{ + struct f_uas *fu = req->context; + int ret; + + fu->flags &= ~USBG_BOT_CMD_PEND; + + if (req->status < 0) + return; + + ret = bot_submit_command(fu, req->buf, req->actual); + if (ret) + pr_err("%s(%d): %d\n", __func__, __LINE__, ret); +} + +static int bot_prepare_reqs(struct f_uas *fu) +{ + int ret; + + fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL); + if (!fu->bot_req_in) + goto err; + + fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL); + if (!fu->bot_req_out) + goto err_out; + + fu->cmd.req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL); + if (!fu->cmd.req) + goto err_cmd; + + fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL); + if (!fu->bot_status.req) + goto err_sts; + + fu->bot_status.req->buf = &fu->bot_status.csw; + fu->bot_status.req->length = US_BULK_CS_WRAP_LEN; + fu->bot_status.req->complete = bot_status_complete; + fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN); + + fu->cmd.buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL); + if (!fu->cmd.buf) + goto err_buf; + + fu->cmd.req->complete = bot_cmd_complete; + fu->cmd.req->buf = fu->cmd.buf; + fu->cmd.req->length = fu->ep_out->maxpacket; + fu->cmd.req->context = fu; + + ret = bot_enqueue_cmd_cbw(fu); + if (ret) + goto err_queue; + return 0; +err_queue: + kfree(fu->cmd.buf); + fu->cmd.buf = NULL; +err_buf: + usb_ep_free_request(fu->ep_in, fu->bot_status.req); +err_sts: + usb_ep_free_request(fu->ep_out, fu->cmd.req); + fu->cmd.req = NULL; +err_cmd: + usb_ep_free_request(fu->ep_out, fu->bot_req_out); + fu->bot_req_out = NULL; +err_out: + usb_ep_free_request(fu->ep_in, fu->bot_req_in); + fu->bot_req_in = NULL; +err: + pr_err("BOT: endpoint setup failed\n"); + return -ENOMEM; +} + +void bot_cleanup_old_alt(struct f_uas *fu) +{ + if (!(fu->flags & USBG_ENABLED)) + return; + + usb_ep_disable(fu->ep_in); + usb_ep_disable(fu->ep_out); + + if (!fu->bot_req_in) + return; + + usb_ep_free_request(fu->ep_in, fu->bot_req_in); + usb_ep_free_request(fu->ep_out, fu->bot_req_out); + usb_ep_free_request(fu->ep_out, fu->cmd.req); + usb_ep_free_request(fu->ep_out, fu->bot_status.req); + + kfree(fu->cmd.buf); + + fu->bot_req_in = NULL; + fu->bot_req_out = NULL; + fu->cmd.req = NULL; + fu->bot_status.req = NULL; + fu->cmd.buf = NULL; +} + +static void bot_set_alt(struct f_uas *fu) +{ + struct usb_function *f = &fu->function; + struct usb_gadget *gadget = f->config->cdev->gadget; + int ret; + + fu->flags = USBG_IS_BOT; + + config_ep_by_speed(gadget, f, fu->ep_in); + ret = usb_ep_enable(fu->ep_in); + if (ret) + goto err_b_in; + + config_ep_by_speed(gadget, f, fu->ep_out); + ret = usb_ep_enable(fu->ep_out); + if (ret) + goto err_b_out; + + ret = bot_prepare_reqs(fu); + if (ret) + goto err_wq; + fu->flags |= USBG_ENABLED; + pr_info("Using the BOT protocol\n"); + return; +err_wq: + usb_ep_disable(fu->ep_out); +err_b_out: + usb_ep_disable(fu->ep_in); +err_b_in: + fu->flags = USBG_IS_BOT; +} + +static int usbg_bot_setup(struct usb_function *f, + const struct usb_ctrlrequest *ctrl) +{ + struct f_uas *fu = to_f_uas(f); + struct usb_composite_dev *cdev = f->config->cdev; + u16 w_value = le16_to_cpu(ctrl->wValue); + u16 w_length = le16_to_cpu(ctrl->wLength); + int luns; + u8 *ret_lun; + + switch (ctrl->bRequest) { + case US_BULK_GET_MAX_LUN: + if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS | + USB_RECIP_INTERFACE)) + return -ENOTSUPP; + + if (w_length < 1) + return -EINVAL; + if (w_value != 0) + return -EINVAL; + luns = atomic_read(&fu->tpg->tpg_port_count); + if (!luns) { + pr_err("No LUNs configured?\n"); + return -EINVAL; + } + /* + * If 4 LUNs are present we return 3 i.e. LUN 0..3 can be + * accessed. The upper limit is 0xf + */ + luns--; + if (luns > 0xf) { + pr_info_once("Limiting the number of luns to 16\n"); + luns = 0xf; + } + ret_lun = cdev->req->buf; + *ret_lun = luns; + cdev->req->length = 1; + return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC); + break; + + case US_BULK_RESET_REQUEST: + /* XXX maybe we should remove previous requests for IN + OUT */ + bot_enqueue_cmd_cbw(fu); + return 0; + break; + }; + return -ENOTSUPP; +} + +/* Start uas.c code */ + +static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream) +{ + /* We have either all three allocated or none */ + if (!stream->req_in) + return; + + usb_ep_free_request(fu->ep_in, stream->req_in); + usb_ep_free_request(fu->ep_out, stream->req_out); + usb_ep_free_request(fu->ep_status, stream->req_status); + + stream->req_in = NULL; + stream->req_out = NULL; + stream->req_status = NULL; +} + +static void uasp_free_cmdreq(struct f_uas *fu) +{ + usb_ep_free_request(fu->ep_cmd, fu->cmd.req); + kfree(fu->cmd.buf); + fu->cmd.req = NULL; + fu->cmd.buf = NULL; +} + +static void uasp_cleanup_old_alt(struct f_uas *fu) +{ + int i; + + if (!(fu->flags & USBG_ENABLED)) + return; + + usb_ep_disable(fu->ep_in); + usb_ep_disable(fu->ep_out); + usb_ep_disable(fu->ep_status); + usb_ep_disable(fu->ep_cmd); + + for (i = 0; i < UASP_SS_EP_COMP_NUM_STREAMS; i++) + uasp_cleanup_one_stream(fu, &fu->stream[i]); + uasp_free_cmdreq(fu); +} + +static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req); + +static int uasp_prepare_r_request(struct usbg_cmd *cmd) +{ + struct se_cmd *se_cmd = &cmd->se_cmd; + struct f_uas *fu = cmd->fu; + struct usb_gadget *gadget = fuas_to_gadget(fu); + struct uas_stream *stream = cmd->stream; + + if (!gadget->sg_supported) { + cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC); + if (!cmd->data_buf) + return -ENOMEM; + + sg_copy_to_buffer(se_cmd->t_data_sg, + se_cmd->t_data_nents, + cmd->data_buf, + se_cmd->data_length); + + stream->req_in->buf = cmd->data_buf; + } else { + stream->req_in->buf = NULL; + stream->req_in->num_sgs = se_cmd->t_data_nents; + stream->req_in->sg = se_cmd->t_data_sg; + } + + stream->req_in->complete = uasp_status_data_cmpl; + stream->req_in->length = se_cmd->data_length; + stream->req_in->context = cmd; + + cmd->state = UASP_SEND_STATUS; + return 0; +} + +static void uasp_prepare_status(struct usbg_cmd *cmd) +{ + struct se_cmd *se_cmd = &cmd->se_cmd; + struct sense_iu *iu = &cmd->sense_iu; + struct uas_stream *stream = cmd->stream; + + cmd->state = UASP_QUEUE_COMMAND; + iu->iu_id = IU_ID_STATUS; + iu->tag = cpu_to_be16(cmd->tag); + + /* + * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?); + */ + iu->len = cpu_to_be16(se_cmd->scsi_sense_length); + iu->status = se_cmd->scsi_status; + stream->req_status->context = cmd; + stream->req_status->length = se_cmd->scsi_sense_length + 16; + stream->req_status->buf = iu; + stream->req_status->complete = uasp_status_data_cmpl; +} + +static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req) +{ + struct usbg_cmd *cmd = req->context; + struct uas_stream *stream = cmd->stream; + struct f_uas *fu = cmd->fu; + int ret; + + if (req->status < 0) + goto cleanup; + + switch (cmd->state) { + case UASP_SEND_DATA: + ret = uasp_prepare_r_request(cmd); + if (ret) + goto cleanup; + ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC); + if (ret) + pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); + break; + + case UASP_RECEIVE_DATA: + ret = usbg_prepare_w_request(cmd, stream->req_out); + if (ret) + goto cleanup; + ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC); + if (ret) + pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); + break; + + case UASP_SEND_STATUS: + uasp_prepare_status(cmd); + ret = usb_ep_queue(fu->ep_status, stream->req_status, + GFP_ATOMIC); + if (ret) + pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); + break; + + case UASP_QUEUE_COMMAND: + usbg_cleanup_cmd(cmd); + usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC); + break; + + default: + BUG(); + }; + return; + +cleanup: + usbg_cleanup_cmd(cmd); +} + +static int uasp_send_status_response(struct usbg_cmd *cmd) +{ + struct f_uas *fu = cmd->fu; + struct uas_stream *stream = cmd->stream; + struct sense_iu *iu = &cmd->sense_iu; + + iu->tag = cpu_to_be16(cmd->tag); + stream->req_status->complete = uasp_status_data_cmpl; + stream->req_status->context = cmd; + cmd->fu = fu; + uasp_prepare_status(cmd); + return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC); +} + +static int uasp_send_read_response(struct usbg_cmd *cmd) +{ + struct f_uas *fu = cmd->fu; + struct uas_stream *stream = cmd->stream; + struct sense_iu *iu = &cmd->sense_iu; + int ret; + + cmd->fu = fu; + + iu->tag = cpu_to_be16(cmd->tag); + if (fu->flags & USBG_USE_STREAMS) { + + ret = uasp_prepare_r_request(cmd); + if (ret) + goto out; + ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC); + if (ret) { + pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); + kfree(cmd->data_buf); + cmd->data_buf = NULL; + } + + } else { + + iu->iu_id = IU_ID_READ_READY; + iu->tag = cpu_to_be16(cmd->tag); + + stream->req_status->complete = uasp_status_data_cmpl; + stream->req_status->context = cmd; + + cmd->state = UASP_SEND_DATA; + stream->req_status->buf = iu; + stream->req_status->length = sizeof(struct iu); + + ret = usb_ep_queue(fu->ep_status, stream->req_status, + GFP_ATOMIC); + if (ret) + pr_err("%s(%d) => %d\n", __func__, __LINE__, ret); + } +out: + return ret; +} + +static int uasp_send_write_request(struct usbg_cmd *cmd) +{ + struct f_uas *fu = cmd->fu; + struct se_cmd *se_cmd = &cmd->se_cmd; + struct uas_stream *stream = cmd->stream; + struct sense_iu *iu = &cmd->sense_iu; + int ret; + + init_completion(&cmd->write_complete); + cmd->fu = fu; + + iu->tag = cpu_to_be16(cmd->tag); + + if (fu->flags & USBG_USE_STREAMS) { + + ret = usbg_prepare_w_request(cmd, stream->req_out); + if (ret) + goto cleanup; + ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC); + if (ret) + pr_err("%s(%d)\n", __func__, __LINE__); + + } else { + + iu->iu_id = IU_ID_WRITE_READY; + iu->tag = cpu_to_be16(cmd->tag); + + stream->req_status->complete = uasp_status_data_cmpl; + stream->req_status->context = cmd; + + cmd->state = UASP_RECEIVE_DATA; + stream->req_status->buf = iu; + stream->req_status->length = sizeof(struct iu); + + ret = usb_ep_queue(fu->ep_status, stream->req_status, + GFP_ATOMIC); + if (ret) + pr_err("%s(%d)\n", __func__, __LINE__); + } + + wait_for_completion(&cmd->write_complete); + transport_generic_process_write(se_cmd); +cleanup: + return ret; +} + +static int usbg_submit_command(struct f_uas *, void *, unsigned int); + +static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req) +{ + struct f_uas *fu = req->context; + int ret; + + if (req->status < 0) + return; + + ret = usbg_submit_command(fu, req->buf, req->actual); + /* + * Once we tune for performance enqueue the command req here again so + * we can receive a second command while we processing this one. Pay + * attention to properly sync STAUS endpoint with DATA IN + OUT so you + * don't break HS. + */ + if (!ret) + return; + usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC); +} + +static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream) +{ + stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL); + if (!stream->req_in) + goto out; + + stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL); + if (!stream->req_out) + goto err_out; + + stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL); + if (!stream->req_status) + goto err_sts; + + return 0; +err_sts: + usb_ep_free_request(fu->ep_status, stream->req_status); + stream->req_status = NULL; +err_out: + usb_ep_free_request(fu->ep_out, stream->req_out); + stream->req_out = NULL; +out: + return -ENOMEM; +} + +static int uasp_alloc_cmd(struct f_uas *fu) +{ + fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL); + if (!fu->cmd.req) + goto err; + + fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL); + if (!fu->cmd.buf) + goto err_buf; + + fu->cmd.req->complete = uasp_cmd_complete; + fu->cmd.req->buf = fu->cmd.buf; + fu->cmd.req->length = fu->ep_cmd->maxpacket; + fu->cmd.req->context = fu; + return 0; + +err_buf: + usb_ep_free_request(fu->ep_cmd, fu->cmd.req); +err: + return -ENOMEM; +} + +static void uasp_setup_stream_res(struct f_uas *fu, int max_streams) +{ + int i; + + for (i = 0; i < max_streams; i++) { + struct uas_stream *s = &fu->stream[i]; + + s->req_in->stream_id = i + 1; + s->req_out->stream_id = i + 1; + s->req_status->stream_id = i + 1; + } +} + +static int uasp_prepare_reqs(struct f_uas *fu) +{ + int ret; + int i; + int max_streams; + + if (fu->flags & USBG_USE_STREAMS) + max_streams = UASP_SS_EP_COMP_NUM_STREAMS; + else + max_streams = 1; + + for (i = 0; i < max_streams; i++) { + ret = uasp_alloc_stream_res(fu, &fu->stream[i]); + if (ret) + goto err_cleanup; + } + + ret = uasp_alloc_cmd(fu); + if (ret) + goto err_free_stream; + uasp_setup_stream_res(fu, max_streams); + + ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC); + if (ret) + goto err_free_stream; + + return 0; + +err_free_stream: + uasp_free_cmdreq(fu); + +err_cleanup: + if (i) { + do { + uasp_cleanup_one_stream(fu, &fu->stream[i - 1]); + i--; + } while (i); + } + pr_err("UASP: endpoint setup failed\n"); + return ret; +} + +static void uasp_set_alt(struct f_uas *fu) +{ + struct usb_function *f = &fu->function; + struct usb_gadget *gadget = f->config->cdev->gadget; + int ret; + + fu->flags = USBG_IS_UAS; + + if (gadget->speed == USB_SPEED_SUPER) + fu->flags |= USBG_USE_STREAMS; + + config_ep_by_speed(gadget, f, fu->ep_in); + ret = usb_ep_enable(fu->ep_in); + if (ret) + goto err_b_in; + + config_ep_by_speed(gadget, f, fu->ep_out); + ret = usb_ep_enable(fu->ep_out); + if (ret) + goto err_b_out; + + config_ep_by_speed(gadget, f, fu->ep_cmd); + ret = usb_ep_enable(fu->ep_cmd); + if (ret) + goto err_cmd; + config_ep_by_speed(gadget, f, fu->ep_status); + ret = usb_ep_enable(fu->ep_status); + if (ret) + goto err_status; + + ret = uasp_prepare_reqs(fu); + if (ret) + goto err_wq; + fu->flags |= USBG_ENABLED; + + pr_info("Using the UAS protocol\n"); + return; +err_wq: + usb_ep_disable(fu->ep_status); +err_status: + usb_ep_disable(fu->ep_cmd); +err_cmd: + usb_ep_disable(fu->ep_out); +err_b_out: + usb_ep_disable(fu->ep_in); +err_b_in: + fu->flags = 0; +} + +static int get_cmd_dir(const unsigned char *cdb) +{ + int ret; + + switch (cdb[0]) { + case READ_6: + case READ_10: + case READ_12: + case READ_16: + case INQUIRY: + case MODE_SENSE: + case MODE_SENSE_10: + case SERVICE_ACTION_IN: + case MAINTENANCE_IN: + case PERSISTENT_RESERVE_IN: + case SECURITY_PROTOCOL_IN: + case ACCESS_CONTROL_IN: + case REPORT_LUNS: + case READ_BLOCK_LIMITS: + case READ_POSITION: + case READ_CAPACITY: + case READ_TOC: + case READ_FORMAT_CAPACITIES: + case REQUEST_SENSE: + ret = DMA_FROM_DEVICE; + break; + + case WRITE_6: + case WRITE_10: + case WRITE_12: + case WRITE_16: + case MODE_SELECT: + case MODE_SELECT_10: + case WRITE_VERIFY: + case WRITE_VERIFY_12: + case PERSISTENT_RESERVE_OUT: + case MAINTENANCE_OUT: + case SECURITY_PROTOCOL_OUT: + case ACCESS_CONTROL_OUT: + ret = DMA_TO_DEVICE; + break; + case ALLOW_MEDIUM_REMOVAL: + case TEST_UNIT_READY: + case SYNCHRONIZE_CACHE: + case START_STOP: + case ERASE: + case REZERO_UNIT: + case SEEK_10: + case SPACE: + case VERIFY: + case WRITE_FILEMARKS: + ret = DMA_NONE; + break; + default: + pr_warn("target: Unknown data direction for SCSI Opcode " + "0x%02x\n", cdb[0]); + ret = -EINVAL; + } + return ret; +} + +static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req) +{ + struct usbg_cmd *cmd = req->context; + struct se_cmd *se_cmd = &cmd->se_cmd; + + if (req->status < 0) { + pr_err("%s() state %d transfer failed\n", __func__, cmd->state); + goto cleanup; + } + + if (req->num_sgs == 0) { + sg_copy_from_buffer(se_cmd->t_data_sg, + se_cmd->t_data_nents, + cmd->data_buf, + se_cmd->data_length); + } + + complete(&cmd->write_complete); + return; + +cleanup: + usbg_cleanup_cmd(cmd); +} + +static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req) +{ + struct se_cmd *se_cmd = &cmd->se_cmd; + struct f_uas *fu = cmd->fu; + struct usb_gadget *gadget = fuas_to_gadget(fu); + + if (!gadget->sg_supported) { + cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC); + if (!cmd->data_buf) + return -ENOMEM; + + req->buf = cmd->data_buf; + } else { + req->buf = NULL; + req->num_sgs = se_cmd->t_data_nents; + req->sg = se_cmd->t_data_sg; + } + + req->complete = usbg_data_write_cmpl; + req->length = se_cmd->data_length; + req->context = cmd; + return 0; +} + +static int usbg_send_status_response(struct se_cmd *se_cmd) +{ + struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, + se_cmd); + struct f_uas *fu = cmd->fu; + + if (fu->flags & USBG_IS_BOT) + return bot_send_status_response(cmd); + else + return uasp_send_status_response(cmd); +} + +static int usbg_send_write_request(struct se_cmd *se_cmd) +{ + struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, + se_cmd); + struct f_uas *fu = cmd->fu; + + if (fu->flags & USBG_IS_BOT) + return bot_send_write_request(cmd); + else + return uasp_send_write_request(cmd); +} + +static int usbg_send_read_response(struct se_cmd *se_cmd) +{ + struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, + se_cmd); + struct f_uas *fu = cmd->fu; + + if (fu->flags & USBG_IS_BOT) + return bot_send_read_response(cmd); + else + return uasp_send_read_response(cmd); +} + +static void usbg_cmd_work(struct work_struct *work) +{ + struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work); + struct se_cmd *se_cmd; + struct tcm_usbg_nexus *tv_nexus; + struct usbg_tpg *tpg; + int dir; + + se_cmd = &cmd->se_cmd; + tpg = cmd->fu->tpg; + tv_nexus = tpg->tpg_nexus; + dir = get_cmd_dir(cmd->cmd_buf); + if (dir < 0) { + transport_init_se_cmd(se_cmd, + tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo, + tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE, + cmd->prio_attr, cmd->sense_iu.sense); + + transport_send_check_condition_and_sense(se_cmd, + TCM_UNSUPPORTED_SCSI_OPCODE, 1); + usbg_cleanup_cmd(cmd); + return; + } + + target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, + cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun, + 0, cmd->prio_attr, dir, TARGET_SCF_UNKNOWN_SIZE); +} + +static int usbg_submit_command(struct f_uas *fu, + void *cmdbuf, unsigned int len) +{ + struct command_iu *cmd_iu = cmdbuf; + struct usbg_cmd *cmd; + struct usbg_tpg *tpg; + struct se_cmd *se_cmd; + struct tcm_usbg_nexus *tv_nexus; + u32 cmd_len; + int ret; + + if (cmd_iu->iu_id != IU_ID_COMMAND) { + pr_err("Unsupported type %d\n", cmd_iu->iu_id); + return -EINVAL; + } + + cmd = kzalloc(sizeof *cmd, GFP_ATOMIC); + if (!cmd) + return -ENOMEM; + + cmd->fu = fu; + + /* XXX until I figure out why I can't free in on complete */ + kref_init(&cmd->ref); + kref_get(&cmd->ref); + + tpg = fu->tpg; + cmd_len = (cmd_iu->len & ~0x3) + 16; + if (cmd_len > USBG_MAX_CMD) + goto err; + + memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len); + + cmd->tag = be16_to_cpup(&cmd_iu->tag); + if (fu->flags & USBG_USE_STREAMS) { + if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS) + goto err; + if (!cmd->tag) + cmd->stream = &fu->stream[0]; + else + cmd->stream = &fu->stream[cmd->tag - 1]; + } else { + cmd->stream = &fu->stream[0]; + } + + tv_nexus = tpg->tpg_nexus; + if (!tv_nexus) { + pr_err("Missing nexus, ignoring command\n"); + goto err; + } + + switch (cmd_iu->prio_attr & 0x7) { + case UAS_HEAD_TAG: + cmd->prio_attr = MSG_HEAD_TAG; + break; + case UAS_ORDERED_TAG: + cmd->prio_attr = MSG_ORDERED_TAG; + break; + case UAS_ACA: + cmd->prio_attr = MSG_ACA_TAG; + break; + default: + pr_debug_once("Unsupported prio_attr: %02x.\n", + cmd_iu->prio_attr); + case UAS_SIMPLE_TAG: + cmd->prio_attr = MSG_SIMPLE_TAG; + break; + } + + se_cmd = &cmd->se_cmd; + cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun); + + INIT_WORK(&cmd->work, usbg_cmd_work); + ret = queue_work(tpg->workqueue, &cmd->work); + if (ret < 0) + goto err; + + return 0; +err: + kfree(cmd); + return -EINVAL; +} + +static void bot_cmd_work(struct work_struct *work) +{ + struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work); + struct se_cmd *se_cmd; + struct tcm_usbg_nexus *tv_nexus; + struct usbg_tpg *tpg; + int dir; + + se_cmd = &cmd->se_cmd; + tpg = cmd->fu->tpg; + tv_nexus = tpg->tpg_nexus; + dir = get_cmd_dir(cmd->cmd_buf); + if (dir < 0) { + transport_init_se_cmd(se_cmd, + tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo, + tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE, + cmd->prio_attr, cmd->sense_iu.sense); + + transport_send_check_condition_and_sense(se_cmd, + TCM_UNSUPPORTED_SCSI_OPCODE, 1); + usbg_cleanup_cmd(cmd); + return; + } + + target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess, + cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun, + cmd->data_len, cmd->prio_attr, dir, 0); +} + +static int bot_submit_command(struct f_uas *fu, + void *cmdbuf, unsigned int len) +{ + struct bulk_cb_wrap *cbw = cmdbuf; + struct usbg_cmd *cmd; + struct usbg_tpg *tpg; + struct se_cmd *se_cmd; + struct tcm_usbg_nexus *tv_nexus; + u32 cmd_len; + int ret; + + if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) { + pr_err("Wrong signature on CBW\n"); + return -EINVAL; + } + if (len != 31) { + pr_err("Wrong length for CBW\n"); + return -EINVAL; + } + + cmd_len = cbw->Length; + if (cmd_len < 1 || cmd_len > 16) + return -EINVAL; + + cmd = kzalloc(sizeof *cmd, GFP_ATOMIC); + if (!cmd) + return -ENOMEM; + + cmd->fu = fu; + + /* XXX until I figure out why I can't free in on complete */ + kref_init(&cmd->ref); + kref_get(&cmd->ref); + + tpg = fu->tpg; + + memcpy(cmd->cmd_buf, cbw->CDB, cmd_len); + + cmd->bot_tag = cbw->Tag; + + tv_nexus = tpg->tpg_nexus; + if (!tv_nexus) { + pr_err("Missing nexus, ignoring command\n"); + goto err; + } + + cmd->prio_attr = MSG_SIMPLE_TAG; + se_cmd = &cmd->se_cmd; + cmd->unpacked_lun = cbw->Lun; + cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0; + cmd->data_len = le32_to_cpu(cbw->DataTransferLength); + + INIT_WORK(&cmd->work, bot_cmd_work); + ret = queue_work(tpg->workqueue, &cmd->work); + if (ret < 0) + goto err; + + return 0; +err: + kfree(cmd); + return -EINVAL; +} + +/* Start fabric.c code */ + +static int usbg_check_true(struct se_portal_group *se_tpg) +{ + return 1; +} + +static int usbg_check_false(struct se_portal_group *se_tpg) +{ + return 0; +} + +static char *usbg_get_fabric_name(void) +{ + return "usb_gadget"; +} + +static u8 usbg_get_fabric_proto_ident(struct se_portal_group *se_tpg) +{ + struct usbg_tpg *tpg = container_of(se_tpg, + struct usbg_tpg, se_tpg); + struct usbg_tport *tport = tpg->tport; + u8 proto_id; + + switch (tport->tport_proto_id) { + case SCSI_PROTOCOL_SAS: + default: + proto_id = sas_get_fabric_proto_ident(se_tpg); + break; + } + + return proto_id; +} + +static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg) +{ + struct usbg_tpg *tpg = container_of(se_tpg, + struct usbg_tpg, se_tpg); + struct usbg_tport *tport = tpg->tport; + + return &tport->tport_name[0]; +} + +static u16 usbg_get_tag(struct se_portal_group *se_tpg) +{ + struct usbg_tpg *tpg = container_of(se_tpg, + struct usbg_tpg, se_tpg); + return tpg->tport_tpgt; +} + +static u32 usbg_get_default_depth(struct se_portal_group *se_tpg) +{ + return 1; +} + +static u32 usbg_get_pr_transport_id( + struct se_portal_group *se_tpg, + struct se_node_acl *se_nacl, + struct t10_pr_registration *pr_reg, + int *format_code, + unsigned char *buf) +{ + struct usbg_tpg *tpg = container_of(se_tpg, + struct usbg_tpg, se_tpg); + struct usbg_tport *tport = tpg->tport; + int ret = 0; + + switch (tport->tport_proto_id) { + case SCSI_PROTOCOL_SAS: + default: + ret = sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, + format_code, buf); + break; + } + + return ret; +} + +static u32 usbg_get_pr_transport_id_len( + struct se_portal_group *se_tpg, + struct se_node_acl *se_nacl, + struct t10_pr_registration *pr_reg, + int *format_code) +{ + struct usbg_tpg *tpg = container_of(se_tpg, + struct usbg_tpg, se_tpg); + struct usbg_tport *tport = tpg->tport; + int ret = 0; + + switch (tport->tport_proto_id) { + case SCSI_PROTOCOL_SAS: + default: + ret = sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, + format_code); + break; + } + + return ret; +} + +static char *usbg_parse_pr_out_transport_id( + struct se_portal_group *se_tpg, + const char *buf, + u32 *out_tid_len, + char **port_nexus_ptr) +{ + struct usbg_tpg *tpg = container_of(se_tpg, + struct usbg_tpg, se_tpg); + struct usbg_tport *tport = tpg->tport; + char *tid = NULL; + + switch (tport->tport_proto_id) { + case SCSI_PROTOCOL_SAS: + default: + tid = sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, + port_nexus_ptr); + } + + return tid; +} + +static struct se_node_acl *usbg_alloc_fabric_acl(struct se_portal_group *se_tpg) +{ + struct usbg_nacl *nacl; + + nacl = kzalloc(sizeof(struct usbg_nacl), GFP_KERNEL); + if (!nacl) { + printk(KERN_ERR "Unable to alocate struct usbg_nacl\n"); + return NULL; + } + + return &nacl->se_node_acl; +} + +static void usbg_release_fabric_acl( + struct se_portal_group *se_tpg, + struct se_node_acl *se_nacl) +{ + struct usbg_nacl *nacl = container_of(se_nacl, + struct usbg_nacl, se_node_acl); + kfree(nacl); +} + +static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg) +{ + return 1; +} + +static int usbg_new_cmd(struct se_cmd *se_cmd) +{ + struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, + se_cmd); + int ret; + + ret = target_setup_cmd_from_cdb(se_cmd, cmd->cmd_buf); + if (ret) + return ret; + + return transport_generic_map_mem_to_cmd(se_cmd, NULL, 0, NULL, 0); +} + +static void usbg_cmd_release(struct kref *ref) +{ + struct usbg_cmd *cmd = container_of(ref, struct usbg_cmd, + ref); + + transport_generic_free_cmd(&cmd->se_cmd, 0); +} + +static void usbg_release_cmd(struct se_cmd *se_cmd) +{ + struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, + se_cmd); + kfree(cmd->data_buf); + kfree(cmd); + return; +} + +static int usbg_shutdown_session(struct se_session *se_sess) +{ + return 0; +} + +static void usbg_close_session(struct se_session *se_sess) +{ + return; +} + +static u32 usbg_sess_get_index(struct se_session *se_sess) +{ + return 0; +} + +/* + * XXX Error recovery: return != 0 if we expect writes. Dunno when that could be + */ +static int usbg_write_pending_status(struct se_cmd *se_cmd) +{ + return 0; +} + +static void usbg_set_default_node_attrs(struct se_node_acl *nacl) +{ + return; +} + +static u32 usbg_get_task_tag(struct se_cmd *se_cmd) +{ + struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, + se_cmd); + struct f_uas *fu = cmd->fu; + + if (fu->flags & USBG_IS_BOT) + return le32_to_cpu(cmd->bot_tag); + else + return cmd->tag; +} + +static int usbg_get_cmd_state(struct se_cmd *se_cmd) +{ + return 0; +} + +static int usbg_queue_tm_rsp(struct se_cmd *se_cmd) +{ + return 0; +} + +static u16 usbg_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length) +{ + return 0; +} + +static u16 usbg_get_fabric_sense_len(void) +{ + return 0; +} + +static const char *usbg_check_wwn(const char *name) +{ + const char *n; + unsigned int len; + + n = strstr(name, "naa."); + if (!n) + return NULL; + n += 4; + len = strlen(n); + if (len == 0 || len > USBG_NAMELEN - 1) + return NULL; + return n; +} + +static struct se_node_acl *usbg_make_nodeacl( + struct se_portal_group *se_tpg, + struct config_group *group, + const char *name) +{ + struct se_node_acl *se_nacl, *se_nacl_new; + struct usbg_nacl *nacl; + u64 wwpn = 0; + u32 nexus_depth; + const char *wnn_name; + + wnn_name = usbg_check_wwn(name); + if (!wnn_name) + return ERR_PTR(-EINVAL); + se_nacl_new = usbg_alloc_fabric_acl(se_tpg); + if (!(se_nacl_new)) + return ERR_PTR(-ENOMEM); + + nexus_depth = 1; + /* + * se_nacl_new may be released by core_tpg_add_initiator_node_acl() + * when converting a NodeACL from demo mode -> explict + */ + se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new, + name, nexus_depth); + if (IS_ERR(se_nacl)) { + usbg_release_fabric_acl(se_tpg, se_nacl_new); + return se_nacl; + } + /* + * Locate our struct usbg_nacl and set the FC Nport WWPN + */ + nacl = container_of(se_nacl, struct usbg_nacl, se_node_acl); + nacl->iport_wwpn = wwpn; + snprintf(nacl->iport_name, sizeof(nacl->iport_name), "%s", name); + return se_nacl; +} + +static void usbg_drop_nodeacl(struct se_node_acl *se_acl) +{ + struct usbg_nacl *nacl = container_of(se_acl, + struct usbg_nacl, se_node_acl); + core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1); + kfree(nacl); +} + +struct usbg_tpg *the_only_tpg_I_currently_have; + +static struct se_portal_group *usbg_make_tpg( + struct se_wwn *wwn, + struct config_group *group, + const char *name) +{ + struct usbg_tport *tport = container_of(wwn, struct usbg_tport, + tport_wwn); + struct usbg_tpg *tpg; + unsigned long tpgt; + int ret; + + if (strstr(name, "tpgt_") != name) + return ERR_PTR(-EINVAL); + if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX) + return ERR_PTR(-EINVAL); + if (the_only_tpg_I_currently_have) { + pr_err("Until the gadget framework can't handle multiple\n"); + pr_err("gadgets, you can't do this here.\n"); + return ERR_PTR(-EBUSY); + } + + tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL); + if (!tpg) { + printk(KERN_ERR "Unable to allocate struct usbg_tpg"); + return ERR_PTR(-ENOMEM); + } + mutex_init(&tpg->tpg_mutex); + atomic_set(&tpg->tpg_port_count, 0); + tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1); + if (!tpg->workqueue) { + kfree(tpg); + return NULL; + } + + tpg->tport = tport; + tpg->tport_tpgt = tpgt; + + ret = core_tpg_register(&usbg_fabric_configfs->tf_ops, wwn, + &tpg->se_tpg, tpg, + TRANSPORT_TPG_TYPE_NORMAL); + if (ret < 0) { + destroy_workqueue(tpg->workqueue); + kfree(tpg); + return NULL; + } + the_only_tpg_I_currently_have = tpg; + return &tpg->se_tpg; +} + +static void usbg_drop_tpg(struct se_portal_group *se_tpg) +{ + struct usbg_tpg *tpg = container_of(se_tpg, + struct usbg_tpg, se_tpg); + + core_tpg_deregister(se_tpg); + destroy_workqueue(tpg->workqueue); + kfree(tpg); + the_only_tpg_I_currently_have = NULL; +} + +static struct se_wwn *usbg_make_tport( + struct target_fabric_configfs *tf, + struct config_group *group, + const char *name) +{ + struct usbg_tport *tport; + const char *wnn_name; + u64 wwpn = 0; + + wnn_name = usbg_check_wwn(name); + if (!wnn_name) + return ERR_PTR(-EINVAL); + + tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL); + if (!(tport)) { + printk(KERN_ERR "Unable to allocate struct usbg_tport"); + return ERR_PTR(-ENOMEM); + } + tport->tport_wwpn = wwpn; + snprintf(tport->tport_name, sizeof(tport->tport_name), wnn_name); + return &tport->tport_wwn; +} + +static void usbg_drop_tport(struct se_wwn *wwn) +{ + struct usbg_tport *tport = container_of(wwn, + struct usbg_tport, tport_wwn); + kfree(tport); +} + +/* + * If somebody feels like dropping the version property, go ahead. + */ +static ssize_t usbg_wwn_show_attr_version( + struct target_fabric_configfs *tf, + char *page) +{ + return sprintf(page, "usb-gadget fabric module\n"); +} +TF_WWN_ATTR_RO(usbg, version); + +static struct configfs_attribute *usbg_wwn_attrs[] = { + &usbg_wwn_version.attr, + NULL, +}; + +static ssize_t tcm_usbg_tpg_show_enable( + struct se_portal_group *se_tpg, + char *page) +{ + struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); + + return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect); +} + +static int usbg_attach(struct usbg_tpg *); +static void usbg_detach(struct usbg_tpg *); + +static ssize_t tcm_usbg_tpg_store_enable( + struct se_portal_group *se_tpg, + const char *page, + size_t count) +{ + struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); + unsigned long op; + ssize_t ret; + + ret = kstrtoul(page, 0, &op); + if (ret < 0) + return -EINVAL; + if (op > 1) + return -EINVAL; + + if (op && tpg->gadget_connect) + goto out; + if (!op && !tpg->gadget_connect) + goto out; + + if (op) { + ret = usbg_attach(tpg); + if (ret) + goto out; + } else { + usbg_detach(tpg); + } + tpg->gadget_connect = op; +out: + return count; +} +TF_TPG_BASE_ATTR(tcm_usbg, enable, S_IRUGO | S_IWUSR); + +static ssize_t tcm_usbg_tpg_show_nexus( + struct se_portal_group *se_tpg, + char *page) +{ + struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); + struct tcm_usbg_nexus *tv_nexus; + ssize_t ret; + + mutex_lock(&tpg->tpg_mutex); + tv_nexus = tpg->tpg_nexus; + if (!tv_nexus) { + ret = -ENODEV; + goto out; + } + ret = snprintf(page, PAGE_SIZE, "%s\n", + tv_nexus->tvn_se_sess->se_node_acl->initiatorname); +out: + mutex_unlock(&tpg->tpg_mutex); + return ret; +} + +static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name) +{ + struct se_portal_group *se_tpg; + struct tcm_usbg_nexus *tv_nexus; + int ret; + + mutex_lock(&tpg->tpg_mutex); + if (tpg->tpg_nexus) { + ret = -EEXIST; + pr_debug("tpg->tpg_nexus already exists\n"); + goto err_unlock; + } + se_tpg = &tpg->se_tpg; + + ret = -ENOMEM; + tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL); + if (!tv_nexus) { + pr_err("Unable to allocate struct tcm_vhost_nexus\n"); + goto err_unlock; + } + tv_nexus->tvn_se_sess = transport_init_session(); + if (IS_ERR(tv_nexus->tvn_se_sess)) + goto err_free; + + /* + * Since we are running in 'demo mode' this call with generate a + * struct se_node_acl for the tcm_vhost struct se_portal_group with + * the SCSI Initiator port name of the passed configfs group 'name'. + */ + tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl( + se_tpg, name); + if (!tv_nexus->tvn_se_sess->se_node_acl) { + pr_debug("core_tpg_check_initiator_node_acl() failed" + " for %s\n", name); + goto err_session; + } + /* + * Now register the TCM vHost virtual I_T Nexus as active with the + * call to __transport_register_session() + */ + __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl, + tv_nexus->tvn_se_sess, tv_nexus); + tpg->tpg_nexus = tv_nexus; + mutex_unlock(&tpg->tpg_mutex); + return 0; + +err_session: + transport_free_session(tv_nexus->tvn_se_sess); +err_free: + kfree(tv_nexus); +err_unlock: + mutex_unlock(&tpg->tpg_mutex); + return ret; +} + +static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg) +{ + struct se_session *se_sess; + struct tcm_usbg_nexus *tv_nexus; + int ret = -ENODEV; + + mutex_lock(&tpg->tpg_mutex); + tv_nexus = tpg->tpg_nexus; + if (!tv_nexus) + goto out; + + se_sess = tv_nexus->tvn_se_sess; + if (!se_sess) + goto out; + + if (atomic_read(&tpg->tpg_port_count)) { + ret = -EPERM; + pr_err("Unable to remove Host I_T Nexus with" + " active TPG port count: %d\n", + atomic_read(&tpg->tpg_port_count)); + goto out; + } + + pr_debug("Removing I_T Nexus to Initiator Port: %s\n", + tv_nexus->tvn_se_sess->se_node_acl->initiatorname); + /* + * Release the SCSI I_T Nexus to the emulated vHost Target Port + */ + transport_deregister_session(tv_nexus->tvn_se_sess); + tpg->tpg_nexus = NULL; + + kfree(tv_nexus); +out: + mutex_unlock(&tpg->tpg_mutex); + return 0; +} + +static ssize_t tcm_usbg_tpg_store_nexus( + struct se_portal_group *se_tpg, + const char *page, + size_t count) +{ + struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); + unsigned char i_port[USBG_NAMELEN], *ptr; + int ret; + + if (!strncmp(page, "NULL", 4)) { + ret = tcm_usbg_drop_nexus(tpg); + return (!ret) ? count : ret; + } + if (strlen(page) > USBG_NAMELEN) { + pr_err("Emulated NAA Sas Address: %s, exceeds" + " max: %d\n", page, USBG_NAMELEN); + return -EINVAL; + } + snprintf(i_port, USBG_NAMELEN, "%s", page); + + ptr = strstr(i_port, "naa."); + if (!ptr) { + pr_err("Missing 'naa.' prefix\n"); + return -EINVAL; + } + + if (i_port[strlen(i_port) - 1] == '\n') + i_port[strlen(i_port) - 1] = '\0'; + + ret = tcm_usbg_make_nexus(tpg, &i_port[4]); + if (ret < 0) + return ret; + return count; +} +TF_TPG_BASE_ATTR(tcm_usbg, nexus, S_IRUGO | S_IWUSR); + +static struct configfs_attribute *usbg_base_attrs[] = { + &tcm_usbg_tpg_enable.attr, + &tcm_usbg_tpg_nexus.attr, + NULL, +}; + +static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun) +{ + struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); + + atomic_inc(&tpg->tpg_port_count); + smp_mb__after_atomic_inc(); + return 0; +} + +static void usbg_port_unlink(struct se_portal_group *se_tpg, + struct se_lun *se_lun) +{ + struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); + + atomic_dec(&tpg->tpg_port_count); + smp_mb__after_atomic_dec(); +} + +static int usbg_check_stop_free(struct se_cmd *se_cmd) +{ + struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd, + se_cmd); + + kref_put(&cmd->ref, usbg_cmd_release); + return 1; +} + +static struct target_core_fabric_ops usbg_ops = { + .get_fabric_name = usbg_get_fabric_name, + .get_fabric_proto_ident = usbg_get_fabric_proto_ident, + .tpg_get_wwn = usbg_get_fabric_wwn, + .tpg_get_tag = usbg_get_tag, + .tpg_get_default_depth = usbg_get_default_depth, + .tpg_get_pr_transport_id = usbg_get_pr_transport_id, + .tpg_get_pr_transport_id_len = usbg_get_pr_transport_id_len, + .tpg_parse_pr_out_transport_id = usbg_parse_pr_out_transport_id, + .tpg_check_demo_mode = usbg_check_true, + .tpg_check_demo_mode_cache = usbg_check_false, + .tpg_check_demo_mode_write_protect = usbg_check_false, + .tpg_check_prod_mode_write_protect = usbg_check_false, + .tpg_alloc_fabric_acl = usbg_alloc_fabric_acl, + .tpg_release_fabric_acl = usbg_release_fabric_acl, + .tpg_get_inst_index = usbg_tpg_get_inst_index, + .new_cmd_map = usbg_new_cmd, + .release_cmd = usbg_release_cmd, + .shutdown_session = usbg_shutdown_session, + .close_session = usbg_close_session, + .sess_get_index = usbg_sess_get_index, + .sess_get_initiator_sid = NULL, + .write_pending = usbg_send_write_request, + .write_pending_status = usbg_write_pending_status, + .set_default_node_attributes = usbg_set_default_node_attrs, + .get_task_tag = usbg_get_task_tag, + .get_cmd_state = usbg_get_cmd_state, + .queue_data_in = usbg_send_read_response, + .queue_status = usbg_send_status_response, + .queue_tm_rsp = usbg_queue_tm_rsp, + .get_fabric_sense_len = usbg_get_fabric_sense_len, + .set_fabric_sense_len = usbg_set_fabric_sense_len, + .check_stop_free = usbg_check_stop_free, + + .fabric_make_wwn = usbg_make_tport, + .fabric_drop_wwn = usbg_drop_tport, + .fabric_make_tpg = usbg_make_tpg, + .fabric_drop_tpg = usbg_drop_tpg, + .fabric_post_link = usbg_port_link, + .fabric_pre_unlink = usbg_port_unlink, + .fabric_make_np = NULL, + .fabric_drop_np = NULL, + .fabric_make_nodeacl = usbg_make_nodeacl, + .fabric_drop_nodeacl = usbg_drop_nodeacl, +}; + +static int usbg_register_configfs(void) +{ + struct target_fabric_configfs *fabric; + int ret; + + fabric = target_fabric_configfs_init(THIS_MODULE, "usb_gadget"); + if (IS_ERR(fabric)) { + printk(KERN_ERR "target_fabric_configfs_init() failed\n"); + return PTR_ERR(fabric); + } + + fabric->tf_ops = usbg_ops; + TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = usbg_wwn_attrs; + TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = usbg_base_attrs; + TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL; + TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL; + TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL; + TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL; + TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL; + TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL; + TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL; + ret = target_fabric_configfs_register(fabric); + if (ret < 0) { + printk(KERN_ERR "target_fabric_configfs_register() failed" + " for usb-gadget\n"); + return ret; + } + usbg_fabric_configfs = fabric; + return 0; +}; + +static void usbg_deregister_configfs(void) +{ + if (!(usbg_fabric_configfs)) + return; + + target_fabric_configfs_deregister(usbg_fabric_configfs); + usbg_fabric_configfs = NULL; +}; + +/* Start gadget.c code */ + +static struct usb_interface_descriptor bot_intf_desc = { + .bLength = sizeof(bot_intf_desc), + .bDescriptorType = USB_DT_INTERFACE, + .bAlternateSetting = 0, + .bNumEndpoints = 2, + .bAlternateSetting = USB_G_ALT_INT_BBB, + .bInterfaceClass = USB_CLASS_MASS_STORAGE, + .bInterfaceSubClass = USB_SC_SCSI, + .bInterfaceProtocol = USB_PR_BULK, + .iInterface = USB_G_STR_INT_UAS, +}; + +static struct usb_interface_descriptor uasp_intf_desc = { + .bLength = sizeof(uasp_intf_desc), + .bDescriptorType = USB_DT_INTERFACE, + .bNumEndpoints = 4, + .bAlternateSetting = USB_G_ALT_INT_UAS, + .bInterfaceClass = USB_CLASS_MASS_STORAGE, + .bInterfaceSubClass = USB_SC_SCSI, + .bInterfaceProtocol = USB_PR_UAS, + .iInterface = USB_G_STR_INT_BBB, +}; + +static struct usb_endpoint_descriptor uasp_bi_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = USB_DIR_IN, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .wMaxPacketSize = cpu_to_le16(512), +}; + +static struct usb_endpoint_descriptor uasp_fs_bi_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = USB_DIR_IN, + .bmAttributes = USB_ENDPOINT_XFER_BULK, +}; + +static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = { + .bLength = sizeof(uasp_bi_pipe_desc), + .bDescriptorType = USB_DT_PIPE_USAGE, + .bPipeID = DATA_IN_PIPE_ID, +}; + +static struct usb_endpoint_descriptor uasp_ss_bi_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = USB_DIR_IN, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .wMaxPacketSize = cpu_to_le16(1024), +}; + +static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = { + .bLength = sizeof(uasp_bi_ep_comp_desc), + .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, + .bMaxBurst = 0, + .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, + .wBytesPerInterval = 0, +}; + +static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = { + .bLength = sizeof(bot_bi_ep_comp_desc), + .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, + .bMaxBurst = 0, +}; + +static struct usb_endpoint_descriptor uasp_bo_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = USB_DIR_OUT, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .wMaxPacketSize = cpu_to_le16(512), +}; + +static struct usb_endpoint_descriptor uasp_fs_bo_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = USB_DIR_OUT, + .bmAttributes = USB_ENDPOINT_XFER_BULK, +}; + +static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = { + .bLength = sizeof(uasp_bo_pipe_desc), + .bDescriptorType = USB_DT_PIPE_USAGE, + .bPipeID = DATA_OUT_PIPE_ID, +}; + +static struct usb_endpoint_descriptor uasp_ss_bo_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = USB_DIR_OUT, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .wMaxPacketSize = cpu_to_le16(0x400), +}; + +static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = { + .bLength = sizeof(uasp_bo_ep_comp_desc), + .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, + .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, +}; + +static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = { + .bLength = sizeof(bot_bo_ep_comp_desc), + .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, +}; + +static struct usb_endpoint_descriptor uasp_status_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = USB_DIR_IN, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .wMaxPacketSize = cpu_to_le16(512), +}; + +static struct usb_endpoint_descriptor uasp_fs_status_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = USB_DIR_IN, + .bmAttributes = USB_ENDPOINT_XFER_BULK, +}; + +static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = { + .bLength = sizeof(uasp_status_pipe_desc), + .bDescriptorType = USB_DT_PIPE_USAGE, + .bPipeID = STATUS_PIPE_ID, +}; + +static struct usb_endpoint_descriptor uasp_ss_status_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = USB_DIR_IN, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .wMaxPacketSize = cpu_to_le16(1024), +}; + +static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = { + .bLength = sizeof(uasp_status_in_ep_comp_desc), + .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, + .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS, +}; + +static struct usb_endpoint_descriptor uasp_cmd_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = USB_DIR_OUT, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .wMaxPacketSize = cpu_to_le16(512), +}; + +static struct usb_endpoint_descriptor uasp_fs_cmd_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = USB_DIR_OUT, + .bmAttributes = USB_ENDPOINT_XFER_BULK, +}; + +static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = { + .bLength = sizeof(uasp_cmd_pipe_desc), + .bDescriptorType = USB_DT_PIPE_USAGE, + .bPipeID = CMD_PIPE_ID, +}; + +static struct usb_endpoint_descriptor uasp_ss_cmd_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = USB_DIR_OUT, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .wMaxPacketSize = cpu_to_le16(1024), +}; + +static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = { + .bLength = sizeof(uasp_cmd_comp_desc), + .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, +}; + +static struct usb_descriptor_header *uasp_fs_function_desc[] = { + (struct usb_descriptor_header *) &bot_intf_desc, + (struct usb_descriptor_header *) &uasp_fs_bi_desc, + (struct usb_descriptor_header *) &uasp_fs_bo_desc, + + (struct usb_descriptor_header *) &uasp_intf_desc, + (struct usb_descriptor_header *) &uasp_fs_bi_desc, + (struct usb_descriptor_header *) &uasp_bi_pipe_desc, + (struct usb_descriptor_header *) &uasp_fs_bo_desc, + (struct usb_descriptor_header *) &uasp_bo_pipe_desc, + (struct usb_descriptor_header *) &uasp_fs_status_desc, + (struct usb_descriptor_header *) &uasp_status_pipe_desc, + (struct usb_descriptor_header *) &uasp_fs_cmd_desc, + (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, +}; + +static struct usb_descriptor_header *uasp_hs_function_desc[] = { + (struct usb_descriptor_header *) &bot_intf_desc, + (struct usb_descriptor_header *) &uasp_bi_desc, + (struct usb_descriptor_header *) &uasp_bo_desc, + + (struct usb_descriptor_header *) &uasp_intf_desc, + (struct usb_descriptor_header *) &uasp_bi_desc, + (struct usb_descriptor_header *) &uasp_bi_pipe_desc, + (struct usb_descriptor_header *) &uasp_bo_desc, + (struct usb_descriptor_header *) &uasp_bo_pipe_desc, + (struct usb_descriptor_header *) &uasp_status_desc, + (struct usb_descriptor_header *) &uasp_status_pipe_desc, + (struct usb_descriptor_header *) &uasp_cmd_desc, + (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, + NULL, +}; + +static struct usb_descriptor_header *uasp_ss_function_desc[] = { + (struct usb_descriptor_header *) &bot_intf_desc, + (struct usb_descriptor_header *) &uasp_ss_bi_desc, + (struct usb_descriptor_header *) &bot_bi_ep_comp_desc, + (struct usb_descriptor_header *) &uasp_ss_bo_desc, + (struct usb_descriptor_header *) &bot_bo_ep_comp_desc, + + (struct usb_descriptor_header *) &uasp_intf_desc, + (struct usb_descriptor_header *) &uasp_ss_bi_desc, + (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc, + (struct usb_descriptor_header *) &uasp_bi_pipe_desc, + (struct usb_descriptor_header *) &uasp_ss_bo_desc, + (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc, + (struct usb_descriptor_header *) &uasp_bo_pipe_desc, + (struct usb_descriptor_header *) &uasp_ss_status_desc, + (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc, + (struct usb_descriptor_header *) &uasp_status_pipe_desc, + (struct usb_descriptor_header *) &uasp_ss_cmd_desc, + (struct usb_descriptor_header *) &uasp_cmd_comp_desc, + (struct usb_descriptor_header *) &uasp_cmd_pipe_desc, + NULL, +}; + +#define UAS_VENDOR_ID 0x0525 /* NetChip */ +#define UAS_PRODUCT_ID 0xa4a5 /* Linux-USB File-backed Storage Gadget */ + +static struct usb_device_descriptor usbg_device_desc = { + .bLength = sizeof(usbg_device_desc), + .bDescriptorType = USB_DT_DEVICE, + .bcdUSB = cpu_to_le16(0x0200), + .bDeviceClass = USB_CLASS_PER_INTERFACE, + .idVendor = cpu_to_le16(UAS_VENDOR_ID), + .idProduct = cpu_to_le16(UAS_PRODUCT_ID), + .iManufacturer = USB_G_STR_MANUFACTOR, + .iProduct = USB_G_STR_PRODUCT, + .iSerialNumber = USB_G_STR_SERIAL, + + .bNumConfigurations = 1, +}; + +static struct usb_string usbg_us_strings[] = { + { USB_G_STR_MANUFACTOR, "Target Manufactor"}, + { USB_G_STR_PRODUCT, "Target Product"}, + { USB_G_STR_SERIAL, "000000000001"}, + { USB_G_STR_CONFIG, "default config"}, + { USB_G_STR_INT_UAS, "USB Attached SCSI"}, + { USB_G_STR_INT_BBB, "Bulk Only Transport"}, + { }, +}; + +static struct usb_gadget_strings usbg_stringtab = { + .language = 0x0409, + .strings = usbg_us_strings, +}; + +static struct usb_gadget_strings *usbg_strings[] = { + &usbg_stringtab, + NULL, +}; + +static int guas_unbind(struct usb_composite_dev *cdev) +{ + return 0; +} + +static struct usb_configuration usbg_config_driver = { + .label = "Linux Target", + .bConfigurationValue = 1, + .iConfiguration = USB_G_STR_CONFIG, + .bmAttributes = USB_CONFIG_ATT_SELFPOWER, +}; + +static void give_back_ep(struct usb_ep **pep) +{ + struct usb_ep *ep = *pep; + if (!ep) + return; + ep->driver_data = NULL; +} + +static int usbg_bind(struct usb_configuration *c, struct usb_function *f) +{ + struct f_uas *fu = to_f_uas(f); + struct usb_gadget *gadget = c->cdev->gadget; + struct usb_ep *ep; + int iface; + + iface = usb_interface_id(c, f); + if (iface < 0) + return iface; + + bot_intf_desc.bInterfaceNumber = iface; + uasp_intf_desc.bInterfaceNumber = iface; + fu->iface = iface; + ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc, + &uasp_bi_ep_comp_desc); + if (!ep) + goto ep_fail; + + ep->driver_data = fu; + fu->ep_in = ep; + + ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc, + &uasp_bo_ep_comp_desc); + if (!ep) + goto ep_fail; + ep->driver_data = fu; + fu->ep_out = ep; + + ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc, + &uasp_status_in_ep_comp_desc); + if (!ep) + goto ep_fail; + ep->driver_data = fu; + fu->ep_status = ep; + + ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc, + &uasp_cmd_comp_desc); + if (!ep) + goto ep_fail; + ep->driver_data = fu; + fu->ep_cmd = ep; + + /* Assume endpoint addresses are the same for both speeds */ + uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress; + uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress; + uasp_status_desc.bEndpointAddress = + uasp_ss_status_desc.bEndpointAddress; + uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress; + + uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress; + uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress; + uasp_fs_status_desc.bEndpointAddress = + uasp_ss_status_desc.bEndpointAddress; + uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress; + + return 0; +ep_fail: + pr_err("Can't claim all required eps\n"); + + give_back_ep(&fu->ep_in); + give_back_ep(&fu->ep_out); + give_back_ep(&fu->ep_status); + give_back_ep(&fu->ep_cmd); + return -ENOTSUPP; +} + +static void usbg_unbind(struct usb_configuration *c, struct usb_function *f) +{ + struct f_uas *fu = to_f_uas(f); + + kfree(fu); +} + +struct guas_setup_wq { + struct work_struct work; + struct f_uas *fu; + unsigned int alt; +}; + +static void usbg_delayed_set_alt(struct work_struct *wq) +{ + struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq, + work); + struct f_uas *fu = work->fu; + int alt = work->alt; + + kfree(work); + + if (fu->flags & USBG_IS_BOT) + bot_cleanup_old_alt(fu); + if (fu->flags & USBG_IS_UAS) + uasp_cleanup_old_alt(fu); + + if (alt == USB_G_ALT_INT_BBB) + bot_set_alt(fu); + else if (alt == USB_G_ALT_INT_UAS) + uasp_set_alt(fu); + usb_composite_setup_continue(fu->function.config->cdev); +} + +static int usbg_set_alt(struct usb_function *f, unsigned intf, unsigned alt) +{ + struct f_uas *fu = to_f_uas(f); + + if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) { + struct guas_setup_wq *work; + + work = kmalloc(sizeof(*work), GFP_ATOMIC); + if (!work) + return -ENOMEM; + INIT_WORK(&work->work, usbg_delayed_set_alt); + work->fu = fu; + work->alt = alt; + schedule_work(&work->work); + return USB_GADGET_DELAYED_STATUS; + } + return -EOPNOTSUPP; +} + +static void usbg_disable(struct usb_function *f) +{ + struct f_uas *fu = to_f_uas(f); + + if (fu->flags & USBG_IS_UAS) + uasp_cleanup_old_alt(fu); + else if (fu->flags & USBG_IS_BOT) + bot_cleanup_old_alt(fu); + fu->flags = 0; +} + +static int usbg_setup(struct usb_function *f, + const struct usb_ctrlrequest *ctrl) +{ + struct f_uas *fu = to_f_uas(f); + + if (!(fu->flags & USBG_IS_BOT)) + return -EOPNOTSUPP; + + return usbg_bot_setup(f, ctrl); +} + +static int usbg_cfg_bind(struct usb_configuration *c) +{ + struct f_uas *fu; + int ret; + + fu = kzalloc(sizeof(*fu), GFP_KERNEL); + if (!fu) + return -ENOMEM; + fu->function.name = "Target Function"; + fu->function.descriptors = uasp_fs_function_desc; + fu->function.hs_descriptors = uasp_hs_function_desc; + fu->function.ss_descriptors = uasp_ss_function_desc; + fu->function.bind = usbg_bind; + fu->function.unbind = usbg_unbind; + fu->function.set_alt = usbg_set_alt; + fu->function.setup = usbg_setup; + fu->function.disable = usbg_disable; + fu->tpg = the_only_tpg_I_currently_have; + + ret = usb_add_function(c, &fu->function); + if (ret) + goto err; + + return 0; +err: + kfree(fu); + return ret; +} + +static int usb_target_bind(struct usb_composite_dev *cdev) +{ + int ret; + + ret = usb_add_config(cdev, &usbg_config_driver, + usbg_cfg_bind); + return 0; +} + +static struct usb_composite_driver usbg_driver = { + .name = "g_target", + .dev = &usbg_device_desc, + .strings = usbg_strings, + .max_speed = USB_SPEED_SUPER, + .unbind = guas_unbind, +}; + +static int usbg_attach(struct usbg_tpg *tpg) +{ + return usb_composite_probe(&usbg_driver, usb_target_bind); +} + +static void usbg_detach(struct usbg_tpg *tpg) +{ + usb_composite_unregister(&usbg_driver); +} + +static int __init usb_target_gadget_init(void) +{ + int ret; + + ret = usbg_register_configfs(); + return ret; +} +module_init(usb_target_gadget_init); + +static void __exit usb_target_gadget_exit(void) +{ + usbg_deregister_configfs(); +} +module_exit(usb_target_gadget_exit); + +MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>"); +MODULE_DESCRIPTION("usb-gadget fabric"); +MODULE_LICENSE("GPL v2"); |