Contributors: 7
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Iñaky Pérez-González |
310 |
81.79% |
1 |
10.00% |
| Thomas Pugliese |
23 |
6.07% |
2 |
20.00% |
| David Vrabel |
20 |
5.28% |
2 |
20.00% |
| Stefano Panella |
18 |
4.75% |
1 |
10.00% |
| Tejun Heo |
5 |
1.32% |
1 |
10.00% |
| Greg Kroah-Hartman |
2 |
0.53% |
2 |
20.00% |
| Lucas De Marchi |
1 |
0.26% |
1 |
10.00% |
| Total |
379 |
|
10 |
|
// SPDX-License-Identifier: GPL-2.0
/*
* WUSB cluster reservation management
*
* Copyright (C) 2007 Cambridge Silicon Radio Ltd.
*/
#include <linux/kernel.h>
#include <linux/uwb.h>
#include "wusbhc.h"
/*
* WUSB cluster reservations are multicast reservations with the
* broadcast cluster ID (BCID) as the target DevAddr.
*
* FIXME: consider adjusting the reservation depending on what devices
* are attached.
*/
static int wusbhc_bwa_set(struct wusbhc *wusbhc, u8 stream,
const struct uwb_mas_bm *mas)
{
if (mas == NULL)
mas = &uwb_mas_bm_zero;
return wusbhc->bwa_set(wusbhc, stream, mas);
}
/**
* wusbhc_rsv_complete_cb - WUSB HC reservation complete callback
* @rsv: the reservation
*
* Either set or clear the HC's view of the reservation.
*
* FIXME: when a reservation is denied the HC should be stopped.
*/
static void wusbhc_rsv_complete_cb(struct uwb_rsv *rsv)
{
struct wusbhc *wusbhc = rsv->pal_priv;
struct device *dev = wusbhc->dev;
struct uwb_mas_bm mas;
dev_dbg(dev, "%s: state = %d\n", __func__, rsv->state);
switch (rsv->state) {
case UWB_RSV_STATE_O_ESTABLISHED:
uwb_rsv_get_usable_mas(rsv, &mas);
dev_dbg(dev, "established reservation: %*pb\n",
UWB_NUM_MAS, mas.bm);
wusbhc_bwa_set(wusbhc, rsv->stream, &mas);
break;
case UWB_RSV_STATE_NONE:
dev_dbg(dev, "removed reservation\n");
wusbhc_bwa_set(wusbhc, 0, NULL);
break;
default:
dev_dbg(dev, "unexpected reservation state: %d\n", rsv->state);
break;
}
}
/**
* wusbhc_rsv_establish - establish a reservation for the cluster
* @wusbhc: the WUSB HC requesting a bandwidth reservation
*/
int wusbhc_rsv_establish(struct wusbhc *wusbhc)
{
struct uwb_rc *rc = wusbhc->uwb_rc;
struct uwb_rsv *rsv;
struct uwb_dev_addr bcid;
int ret;
if (rc == NULL)
return -ENODEV;
rsv = uwb_rsv_create(rc, wusbhc_rsv_complete_cb, wusbhc);
if (rsv == NULL)
return -ENOMEM;
bcid.data[0] = wusbhc->cluster_id;
bcid.data[1] = 0;
rsv->target.type = UWB_RSV_TARGET_DEVADDR;
rsv->target.devaddr = bcid;
rsv->type = UWB_DRP_TYPE_PRIVATE;
rsv->max_mas = 256; /* try to get as much as possible */
rsv->min_mas = 15; /* one MAS per zone */
rsv->max_interval = 1; /* max latency is one zone */
rsv->is_multicast = true;
ret = uwb_rsv_establish(rsv);
if (ret == 0)
wusbhc->rsv = rsv;
else
uwb_rsv_destroy(rsv);
return ret;
}
/**
* wusbhc_rsv_terminate - terminate the cluster reservation
* @wusbhc: the WUSB host whose reservation is to be terminated
*/
void wusbhc_rsv_terminate(struct wusbhc *wusbhc)
{
if (wusbhc->rsv) {
uwb_rsv_terminate(wusbhc->rsv);
uwb_rsv_destroy(wusbhc->rsv);
wusbhc->rsv = NULL;
}
}