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linux/drivers/usb/gadget/function/f_tcm.c

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/* 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_tcq.h>
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include <asm/unaligned.h>
#include "tcm.h"
#include "u_tcm.h"
#include "configfs.h"
#define TPG_INSTANCES 1
struct tpg_instance {
struct usb_function_instance *func_inst;
struct usbg_tpg *tpg;
};
static struct tpg_instance tpg_instances[TPG_INSTANCES];
static DEFINE_MUTEX(tpg_instances_lock);
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;
unsigned int csw_stat;
csw_stat = cmd->csw_code;
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);
target_execute_cmd(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;
}
static 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);
case US_BULK_RESET_REQUEST:
/* XXX maybe we should remove previous requests for IN + OUT */
bot_enqueue_cmd_cbw(fu);
return 0;
}
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);
target_execute_cmd(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_16:
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:
#define CMD_DIR_MSG "target: Unknown data direction for SCSI Opcode 0x%02x\n"
pr_warn(CMD_DIR_MSG, cdb[0]);
#undef CMD_DIR_MSG
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);
goto out;
}
if (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) < 0)
goto out;
return;
out:
transport_send_check_condition_and_sense(se_cmd,
TCM_UNSUPPORTED_SCSI_OPCODE, 1);
usbg_cleanup_cmd(cmd);
}
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 tcm_usbg_nexus *tv_nexus;
u32 cmd_len;
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);
cmd->se_cmd.tag = cmd->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 = TCM_HEAD_TAG;
break;
case UAS_ORDERED_TAG:
cmd->prio_attr = TCM_ORDERED_TAG;
break;
case UAS_ACA:
cmd->prio_attr = TCM_ACA_TAG;
break;
default:
pr_debug_once("Unsupported prio_attr: %02x.\n",
cmd_iu->prio_attr);
case UAS_SIMPLE_TAG:
cmd->prio_attr = TCM_SIMPLE_TAG;
break;
}
cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
INIT_WORK(&cmd->work, usbg_cmd_work);
queue_work(tpg->workqueue, &cmd->work);
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);
goto out;
}
if (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) < 0)
goto out;
return;
out:
transport_send_check_condition_and_sense(se_cmd,
TCM_UNSUPPORTED_SCSI_OPCODE, 1);
usbg_cleanup_cmd(cmd);
}
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 tcm_usbg_nexus *tv_nexus;
u32 cmd_len;
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 = TCM_SIMPLE_TAG;
cmd->unpacked_lun = cbw->Lun;
cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag);
INIT_WORK(&cmd->work, bot_cmd_work);
queue_work(tpg->workqueue, &cmd->work);
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 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_tpg_get_inst_index(struct se_portal_group *se_tpg)
{
return 1;
}
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);
}
static int usbg_shutdown_session(struct se_session *se_sess)
{
return 0;
}
static void usbg_close_session(struct se_session *se_sess)
{
}
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)
{
}
static int usbg_get_cmd_state(struct se_cmd *se_cmd)
{
return 0;
}
static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
{
}
static void usbg_aborted_task(struct se_cmd *se_cmd)
{
}
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 int usbg_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
{
if (!usbg_check_wwn(name))
return -EINVAL;
return 0;
}
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;
struct f_tcm_opts *opts;
unsigned i;
if (strstr(name, "tpgt_") != name)
return ERR_PTR(-EINVAL);
if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
return ERR_PTR(-EINVAL);
ret = -ENODEV;
mutex_lock(&tpg_instances_lock);
for (i = 0; i < TPG_INSTANCES; ++i)
if (tpg_instances[i].func_inst && !tpg_instances[i].tpg)
break;
if (i == TPG_INSTANCES)
goto unlock_inst;
opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts,
func_inst);
mutex_lock(&opts->dep_lock);
if (!opts->ready)
goto unlock_dep;
if (opts->has_dep) {
if (!try_module_get(opts->dependent))
goto unlock_dep;
} else {
ret = configfs_depend_item_unlocked(
group->cg_subsys,
&opts->func_inst.group.cg_item);
if (ret)
goto unlock_dep;
}
tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
ret = -ENOMEM;
if (!tpg)
goto unref_dep;
mutex_init(&tpg->tpg_mutex);
atomic_set(&tpg->tpg_port_count, 0);
tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
if (!tpg->workqueue)
goto free_tpg;
tpg->tport = tport;
tpg->tport_tpgt = tpgt;
/*
* SPC doesn't assign a protocol identifier for USB-SCSI, so we
* pretend to be SAS..
*/
ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS);
if (ret < 0)
goto free_workqueue;
tpg_instances[i].tpg = tpg;
tpg->fi = tpg_instances[i].func_inst;
mutex_unlock(&opts->dep_lock);
mutex_unlock(&tpg_instances_lock);
return &tpg->se_tpg;
free_workqueue:
destroy_workqueue(tpg->workqueue);
free_tpg:
kfree(tpg);
unref_dep:
if (opts->has_dep)
module_put(opts->dependent);
else
configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item);
unlock_dep:
mutex_unlock(&opts->dep_lock);
unlock_inst:
mutex_unlock(&tpg_instances_lock);
return ERR_PTR(ret);
}
static int tcm_usbg_drop_nexus(struct usbg_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);
unsigned i;
struct f_tcm_opts *opts;
tcm_usbg_drop_nexus(tpg);
core_tpg_deregister(se_tpg);
destroy_workqueue(tpg->workqueue);
mutex_lock(&tpg_instances_lock);
for (i = 0; i < TPG_INSTANCES; ++i)
if (tpg_instances[i].tpg == tpg)
break;
if (i < TPG_INSTANCES)
tpg_instances[i].tpg = NULL;
opts = container_of(tpg_instances[i].func_inst,
struct f_tcm_opts, func_inst);
mutex_lock(&opts->dep_lock);
if (opts->has_dep)
module_put(opts->dependent);
else
configfs_undepend_item_unlocked(&opts->func_inst.group.cg_item);
mutex_unlock(&opts->dep_lock);
mutex_unlock(&tpg_instances_lock);
kfree(tpg);
}
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))
return ERR_PTR(-ENOMEM);
tport->tport_wwpn = wwpn;
snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", 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_version_show(struct config_item *item, char *page)
{
return sprintf(page, "usb-gadget fabric module\n");
}
CONFIGFS_ATTR_RO(usbg_wwn_, version);
static struct configfs_attribute *usbg_wwn_attrs[] = {
&usbg_wwn_attr_version,
NULL,
};
static ssize_t tcm_usbg_tpg_enable_show(struct config_item *item, char *page)
{
struct se_portal_group *se_tpg = to_tpg(item);
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_enable_store(struct config_item *item,
const char *page, size_t count)
{
struct se_portal_group *se_tpg = to_tpg(item);
struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
bool op;
ssize_t ret;
ret = strtobool(page, &op);
if (ret)
return ret;
if ((op && tpg->gadget_connect) || (!op && !tpg->gadget_connect))
return -EINVAL;
if (op)
ret = usbg_attach(tpg);
else
usbg_detach(tpg);
if (ret)
return ret;
tpg->gadget_connect = op;
return count;
}
static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page)
{
struct se_portal_group *se_tpg = to_tpg(item);
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)
goto err_unlock;
tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL);
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) {
#define MAKE_NEXUS_MSG "core_tpg_check_initiator_node_acl() failed for %s\n"
pr_debug(MAKE_NEXUS_MSG, name);
#undef MAKE_NEXUS_MSG
goto err_session;
}
/*
* Now register the TCM vHost virtual I_T Nexus as active.
*/
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;
#define MSG "Unable to remove Host I_T Nexus with active TPG port count: %d\n"
pr_err(MSG, atomic_read(&tpg->tpg_port_count));
#undef MSG
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);
ret = 0;
out:
mutex_unlock(&tpg->tpg_mutex);
return ret;
}
static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item,
const char *page, size_t count)
{
struct se_portal_group *se_tpg = to_tpg(item);
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) {
#define NEXUS_STORE_MSG "Emulated NAA Sas Address: %s, exceeds max: %d\n"
pr_err(NEXUS_STORE_MSG, page, USBG_NAMELEN);
#undef NEXUS_STORE_MSG
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[0]);
if (ret < 0)
return ret;
return count;
}
CONFIGFS_ATTR(tcm_usbg_tpg_, enable);
CONFIGFS_ATTR(tcm_usbg_tpg_, nexus);
static struct configfs_attribute *usbg_base_attrs[] = {
&tcm_usbg_tpg_attr_enable,
&tcm_usbg_tpg_attr_nexus,
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();
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();
}
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 const struct target_core_fabric_ops usbg_ops = {
.module = THIS_MODULE,
.name = "usb_gadget",
.get_fabric_name = usbg_get_fabric_name,
.tpg_get_wwn = usbg_get_fabric_wwn,
.tpg_get_tag = usbg_get_tag,
.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_get_inst_index = usbg_tpg_get_inst_index,
.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_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,
.aborted_task = usbg_aborted_task,
.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_init_nodeacl = usbg_init_nodeacl,
.tfc_wwn_attrs = usbg_wwn_attrs,
.tfc_tpg_base_attrs = usbg_base_attrs,
};
/* Start gadget.c code */
static struct usb_interface_descriptor bot_intf_desc = {
.bLength = sizeof(bot_intf_desc),
.bDescriptorType = USB_DT_INTERFACE,
.bNumEndpoints = 2,
.bAlternateSetting = USB_G_ALT_INT_BBB,
.bInterfaceClass = USB_CLASS_MASS_STORAGE,
.bInterfaceSubClass = USB_SC_SCSI,
.bInterfaceProtocol = USB_PR_BULK,
};
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,
};
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,
NULL,
};
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,
};
static struct usb_string tcm_us_strings[] = {
[USB_G_STR_INT_UAS].s = "USB Attached SCSI",
[USB_G_STR_INT_BBB].s = "Bulk Only Transport",
{ },
};
static struct usb_gadget_strings tcm_stringtab = {
.language = 0x0409,
.strings = tcm_us_strings,
};
static struct usb_gadget_strings *tcm_strings[] = {
&tcm_stringtab,
NULL,
};
static int tcm_bind(struct usb_configuration *c, struct usb_function *f)
{
struct f_uas *fu = to_f_uas(f);
struct usb_string *us;
struct usb_gadget *gadget = c->cdev->gadget;
struct usb_ep *ep;
struct f_tcm_opts *opts;
int iface;
int ret;
opts = container_of(f->fi, struct f_tcm_opts, func_inst);
mutex_lock(&opts->dep_lock);
if (!opts->can_attach) {
mutex_unlock(&opts->dep_lock);
return -ENODEV;
}
mutex_unlock(&opts->dep_lock);
us = usb_gstrings_attach(c->cdev, tcm_strings,
ARRAY_SIZE(tcm_us_strings));
if (IS_ERR(us))
return PTR_ERR(us);
bot_intf_desc.iInterface = us[USB_G_STR_INT_BBB].id;
uasp_intf_desc.iInterface = us[USB_G_STR_INT_UAS].id;
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;
fu->ep_in = ep;
ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
&uasp_bo_ep_comp_desc);
if (!ep)
goto ep_fail;
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;
fu->ep_status = ep;
ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
&uasp_cmd_comp_desc);
if (!ep)
goto ep_fail;
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;
ret = usb_assign_descriptors(f, uasp_fs_function_desc,
uasp_hs_function_desc, uasp_ss_function_desc);
if (ret)
goto ep_fail;
return 0;
ep_fail:
pr_err("Can't claim all required eps\n");
return -ENOTSUPP;
}
struct guas_setup_wq {
struct work_struct work;
struct f_uas *fu;
unsigned int alt;
};
static void tcm_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 tcm_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, tcm_delayed_set_alt);
work->fu = fu;
work->alt = alt;
schedule_work(&work->work);
return USB_GADGET_DELAYED_STATUS;
}
return -EOPNOTSUPP;
}
static void tcm_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 tcm_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 inline struct f_tcm_opts *to_f_tcm_opts(struct config_item *item)
{
return container_of(to_config_group(item), struct f_tcm_opts,
func_inst.group);
}
static void tcm_attr_release(struct config_item *item)
{
struct f_tcm_opts *opts = to_f_tcm_opts(item);
usb_put_function_instance(&opts->func_inst);
}
static struct configfs_item_operations tcm_item_ops = {
.release = tcm_attr_release,
};
static struct config_item_type tcm_func_type = {
.ct_item_ops = &tcm_item_ops,
.ct_owner = THIS_MODULE,
};
static void tcm_free_inst(struct usb_function_instance *f)
{
struct f_tcm_opts *opts;
unsigned i;
opts = container_of(f, struct f_tcm_opts, func_inst);
mutex_lock(&tpg_instances_lock);
for (i = 0; i < TPG_INSTANCES; ++i)
if (tpg_instances[i].func_inst == f)
break;
if (i < TPG_INSTANCES)
tpg_instances[i].func_inst = NULL;
mutex_unlock(&tpg_instances_lock);
kfree(opts);
}
static int tcm_register_callback(struct usb_function_instance *f)
{
struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
mutex_lock(&opts->dep_lock);
opts->can_attach = true;
mutex_unlock(&opts->dep_lock);
return 0;
}
static void tcm_unregister_callback(struct usb_function_instance *f)
{
struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
mutex_lock(&opts->dep_lock);
unregister_gadget_item(opts->
func_inst.group.cg_item.ci_parent->ci_parent);
opts->can_attach = false;
mutex_unlock(&opts->dep_lock);
}
static int usbg_attach(struct usbg_tpg *tpg)
{
struct usb_function_instance *f = tpg->fi;
struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
if (opts->tcm_register_callback)
return opts->tcm_register_callback(f);
return 0;
}
static void usbg_detach(struct usbg_tpg *tpg)
{
struct usb_function_instance *f = tpg->fi;
struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
if (opts->tcm_unregister_callback)
opts->tcm_unregister_callback(f);
}
static int tcm_set_name(struct usb_function_instance *f, const char *name)
{
struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst);
pr_debug("tcm: Activating %s\n", name);
mutex_lock(&opts->dep_lock);
opts->ready = true;
mutex_unlock(&opts->dep_lock);
return 0;
}
static struct usb_function_instance *tcm_alloc_inst(void)
{
struct f_tcm_opts *opts;
int i;
opts = kzalloc(sizeof(*opts), GFP_KERNEL);
if (!opts)
return ERR_PTR(-ENOMEM);
mutex_lock(&tpg_instances_lock);
for (i = 0; i < TPG_INSTANCES; ++i)
if (!tpg_instances[i].func_inst)
break;
if (i == TPG_INSTANCES) {
mutex_unlock(&tpg_instances_lock);
kfree(opts);
return ERR_PTR(-EBUSY);
}
tpg_instances[i].func_inst = &opts->func_inst;
mutex_unlock(&tpg_instances_lock);
mutex_init(&opts->dep_lock);
opts->func_inst.set_inst_name = tcm_set_name;
opts->func_inst.free_func_inst = tcm_free_inst;
opts->tcm_register_callback = tcm_register_callback;
opts->tcm_unregister_callback = tcm_unregister_callback;
config_group_init_type_name(&opts->func_inst.group, "",
&tcm_func_type);
return &opts->func_inst;
}
static void tcm_free(struct usb_function *f)
{
struct f_uas *tcm = to_f_uas(f);
kfree(tcm);
}
static void tcm_unbind(struct usb_configuration *c, struct usb_function *f)
{
usb_free_all_descriptors(f);
}
static struct usb_function *tcm_alloc(struct usb_function_instance *fi)
{
struct f_uas *fu;
unsigned i;
mutex_lock(&tpg_instances_lock);
for (i = 0; i < TPG_INSTANCES; ++i)
if (tpg_instances[i].func_inst == fi)
break;
if (i == TPG_INSTANCES) {
mutex_unlock(&tpg_instances_lock);
return ERR_PTR(-ENODEV);
}
fu = kzalloc(sizeof(*fu), GFP_KERNEL);
if (!fu) {
mutex_unlock(&tpg_instances_lock);
return ERR_PTR(-ENOMEM);
}
fu->function.name = "Target Function";
fu->function.bind = tcm_bind;
fu->function.unbind = tcm_unbind;
fu->function.set_alt = tcm_set_alt;
fu->function.setup = tcm_setup;
fu->function.disable = tcm_disable;
fu->function.free_func = tcm_free;
fu->tpg = tpg_instances[i].tpg;
mutex_unlock(&tpg_instances_lock);
return &fu->function;
}
DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc);
static int tcm_init(void)
{
int ret;
ret = usb_function_register(&tcmusb_func);
if (ret)
return ret;
ret = target_register_template(&usbg_ops);
if (ret)
usb_function_unregister(&tcmusb_func);
return ret;
}
module_init(tcm_init);
static void tcm_exit(void)
{
target_unregister_template(&usbg_ops);
usb_function_unregister(&tcmusb_func);
}
module_exit(tcm_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Sebastian Andrzej Siewior");
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