Merge branch 'usb-target-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
Merge commit. Changes below are compared with the first parent: c9bfa7d7.
Changes
4 files changed · +2638 −0
| File | Status | Add | Del | Content |
|---|---|---|---|---|
| drivers/usb/gadget/Kconfig | modified | +10 | −0 | View file |
| drivers/usb/gadget/Makefile | modified | +2 | −0 | View file |
| drivers/usb/gadget/tcm_usb_gadget.c | added | +2480 | −0 | View file |
| drivers/usb/gadget/tcm_usb_gadget.h | added | +146 | −0 | View file |
Only the first 600 diff lines are shown. Download the complete patch.
drivers/usb/gadget/Kconfig
View filediff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 2633f75..569b33e 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -798,6 +798,16 @@ config USB_MASS_STORAGE
Say "y" to link the driver statically, or "m" to build
a dynamically linked module called "g_mass_storage".
+config USB_GADGET_TARGET
+ tristate "USB Gadget Target Fabric Module"
+ depends on TARGET_CORE
+ help
+ This fabric is an USB gadget. Two USB protocols are supported that is
+ BBB or BOT (Bulk Only Transport) and UAS (USB Attached SCSI). BOT is
+ advertised on alternative interface 0 (primary) and UAS is on
+ alternative interface 1. Both protocols can work on USB2.0 and USB3.0.
+ UAS utilizes the USB 3.0 feature called streams support.
+
config USB_G_SERIAL
tristate "Serial Gadget (with CDC ACM and CDC OBEX support)"
help
drivers/usb/gadget/Makefile
View filediff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index b7f6eef..fc5b836 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -52,6 +52,7 @@ g_nokia-y := nokia.o
g_webcam-y := webcam.o
g_ncm-y := ncm.o
g_acm_ms-y := acm_ms.o
+g_tcm_usb_gadget-y := tcm_usb_gadget.o
obj-$(CONFIG_USB_ZERO) += g_zero.o
obj-$(CONFIG_USB_AUDIO) += g_audio.o
@@ -71,3 +72,4 @@ obj-$(CONFIG_USB_G_NOKIA) += g_nokia.o
obj-$(CONFIG_USB_G_WEBCAM) += g_webcam.o
obj-$(CONFIG_USB_G_NCM) += g_ncm.o
obj-$(CONFIG_USB_G_ACM_MS) += g_acm_ms.o
+obj-$(CONFIG_USB_GADGET_TARGET) += tcm_usb_gadget.o
drivers/usb/gadget/tcm_usb_gadget.c
View filediff --git a/drivers/usb/gadget/tcm_usb_gadget.c b/drivers/usb/gadget/tcm_usb_gadget.c
new file mode 100644
index 0000000..c46439c
--- /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;
+}
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drivers/usb/gadget/tcm_usb_gadget.h
View fileThis diff is incomplete. Download the complete patch.