/* Drop an endpoint from a new bandwidth configuration for this device.
* Only one call to this function is allowed per endpoint before
* check_bandwidth() or reset_bandwidth() must be called.
* A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
* add the endpoint to the schedule with possibly new parameters denoted by a
* different endpoint descriptor in usb_host_endpoint.
* A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
* not allowed.
*
* The USB core will not allow URBs to be queued to an endpoint that is being
* disabled, so there's no need for mutual exclusion to protect
* the xhci->devs[slot_id] structure.
*/
int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
struct usb_host_endpoint *ep)
{
struct xhci_hcd *xhci;
struct xhci_container_ctx *in_ctx, *out_ctx;
struct xhci_input_control_ctx *ctrl_ctx;
unsigned int ep_index;
struct xhci_ep_ctx *ep_ctx;
u32 drop_flag;
u32 new_add_flags, new_drop_flags;
int ret;
ret = xhci_check_args(hcd, udev, ep, 1, true, __func__);
if (ret <= 0)
return ret;
xhci = hcd_to_xhci(hcd);
if (xhci->xhc_state & XHCI_STATE_DYING)
return -ENODEV;
xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
drop_flag = xhci_get_endpoint_flag(&ep->desc);
if (drop_flag == SLOT_FLAG || drop_flag == EP0_FLAG) {
xhci_dbg(xhci, "xHCI %s - can't drop slot or ep 0 %#x\n",
__func__, drop_flag);
return 0;
}
in_ctx = xhci->devs[udev->slot_id]->in_ctx;
out_ctx = xhci->devs[udev->slot_id]->out_ctx;
ctrl_ctx = xhci_get_input_control_ctx(in_ctx);
if (!ctrl_ctx) {
xhci_warn(xhci, "%s: Could not get input context, bad type.\n",
__func__);
return 0;
}
ep_index = xhci_get_endpoint_index(&ep->desc);
ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
/* If the HC already knows the endpoint is disabled,
* or the HCD has noted it is disabled, ignore this request
*/
if (((ep_ctx->ep_info & cpu_to_le32(EP_STATE_MASK)) ==
cpu_to_le32(EP_STATE_DISABLED)) ||
le32_to_cpu(ctrl_ctx->drop_flags) &
xhci_get_endpoint_flag(&ep->desc)) {
/* Do not warn when called after a usb_device_reset */
if (xhci->devs[udev->slot_id]->eps[ep_index].ring != NULL)
xhci_warn(xhci, "xHCI %s called with disabled ep %p\n",
__func__, ep);
return 0;
}
ctrl_ctx->drop_flags |= cpu_to_le32(drop_flag);
new_drop_flags = le32_t
int xhci_add_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
struct usb_host_endpoint *ep)
{
struct xhci_hcd *xhci;
struct xhci_container_ctx *in_ctx, *out_ctx;
unsigned int ep_index;
struct xhci_ep_ctx *ep_ctx;
struct xhci_slot_ctx *slot_ctx;
struct xhci_input_control_ctx *ctrl_ctx;
u32 added_ctxs;
unsigned int last_ctx;
u32 new_add_flags, new_drop_flags, new_slot_info;
int ret = 0;
ret = xhci_check_args(hcd, udev, ep, 1, __func__);
if (ret <= 0) {
ep->hcpriv = NULL;
return ret;
}
xhci = hcd_to_xhci(hcd);
added_ctxs = xhci_get_endpoint_flag(&ep->desc);
last_ctx = xhci_last_valid_endpoint(added_ctxs);
if (added_ctxs == SLOT_FLAG || added_ctxs == EP0_FLAG) {
xhci_dbg(xhci, "xHCI %s - can't add slot or ep 0 %#x\n",
__func__, added_ctxs);
return 0;
}
if (!xhci->devs || !xhci->devs[udev->slot_id]) {
xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
__func__);
return -EINVAL;
}
in_ctx = xhci->devs[udev->slot_id]->in_ctx;
out_ctx = xhci->devs[udev->slot_id]->out_ctx;
ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
ep_index = xhci_get_endpoint_index(&ep->desc);
ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
if (ctrl_ctx->add_flags & xhci_get_endpoint_flag(&ep->desc)) {
xhci_warn(xhci, "xHCI %s called with enabled ep %p\n",
__func__, ep);
return 0;
}
if (xhci_endpoint_init(xhci, xhci->devs[udev->slot_id],
udev, ep, GFP_KERNEL) < 0) {
dev_dbg(&udev->dev, "%s - could not initialize ep %#x\n",
__func__, ep->desc.bEndpointAddress);
return -ENOMEM;
}
ctrl_ctx->add_flags |= added_ctxs;
new_add_flags = ctrl_ctx->add_flags;
new_drop_flags = ctrl_ctx->drop_flags;
slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
if ((slot_ctx->dev_info & LAST_CTX_MASK) < LAST_CTX(last_ctx)) {
slot_ctx->dev_info &= ~LAST_CTX_MASK;
slot_ctx->dev_info |= LAST_CTX(last_ctx);
}
new_slot_info = slot_ctx->dev_info;
ep->hcpriv = udev;
xhci_dbg(xhci, "add ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
(unsigned int) ep->desc.bEndpointAddress,
udev->slot_id,
(unsigned int) new_drop_flags,
(unsigned int) new_add_flags,
(unsigned int) new_slot_info);
return 0;
}
int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
struct usb_host_endpoint *ep)
{
struct xhci_hcd *xhci;
struct xhci_container_ctx *in_ctx, *out_ctx;
struct xhci_input_control_ctx *ctrl_ctx;
struct xhci_slot_ctx *slot_ctx;
unsigned int last_ctx;
unsigned int ep_index;
struct xhci_ep_ctx *ep_ctx;
u32 drop_flag;
u32 new_add_flags, new_drop_flags, new_slot_info;
int ret;
ret = xhci_check_args(hcd, udev, ep, 1, __func__);
if (ret <= 0)
return ret;
xhci = hcd_to_xhci(hcd);
xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
drop_flag = xhci_get_endpoint_flag(&ep->desc);
if (drop_flag == SLOT_FLAG || drop_flag == EP0_FLAG) {
xhci_dbg(xhci, "xHCI %s - can't drop slot or ep 0 %#x\n",
__func__, drop_flag);
return 0;
}
if (!xhci->devs || !xhci->devs[udev->slot_id]) {
xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
__func__);
return -EINVAL;
}
in_ctx = xhci->devs[udev->slot_id]->in_ctx;
out_ctx = xhci->devs[udev->slot_id]->out_ctx;
ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
ep_index = xhci_get_endpoint_index(&ep->desc);
ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
if ((ep_ctx->ep_info & EP_STATE_MASK) == EP_STATE_DISABLED ||
ctrl_ctx->drop_flags & xhci_get_endpoint_flag(&ep->desc)) {
xhci_warn(xhci, "xHCI %s called with disabled ep %p\n",
__func__, ep);
return 0;
}
ctrl_ctx->drop_flags |= drop_flag;
new_drop_flags = ctrl_ctx->drop_flags;
ctrl_ctx->add_flags &= ~drop_flag;
new_add_flags = ctrl_ctx->add_flags;
last_ctx = xhci_last_valid_endpoint(ctrl_ctx->add_flags);
slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
if ((slot_ctx->dev_info & LAST_CTX_MASK) > LAST_CTX(last_ctx)) {
slot_ctx->dev_info &= ~LAST_CTX_MASK;
slot_ctx->dev_info |= LAST_CTX(last_ctx);
}
new_slot_info = slot_ctx->dev_info;
xhci_endpoint_zero(xhci, xhci->devs[udev->slot_id], ep);
xhci_dbg(xhci, "drop ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
(unsigned int) ep->desc.bEndpointAddress,
udev->slot_id,
(unsigned int) new_drop_flags,
(unsigned int) new_add_flags,
(unsigned int) new_slot_info);
return 0;
}
