forked from Minki/linux
c94b731da2
The gnttab_end_foreign_access() family of functions is taking a "readonly" parameter, which isn't used. Remove it from the function parameters. Signed-off-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/20220311103429.12845-3-jgross@suse.com Reviewed-by: Jan Beulich <jbeulich@suse.com> Acked-by: Christian Schoenebeck <qemu_oss@crudebyte.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
491 lines
12 KiB
C
491 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR MIT
|
|
|
|
/*
|
|
* Xen para-virtual sound device
|
|
*
|
|
* Copyright (C) 2016-2018 EPAM Systems Inc.
|
|
*
|
|
* Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
|
|
*/
|
|
|
|
#include <xen/events.h>
|
|
#include <xen/grant_table.h>
|
|
#include <xen/xen.h>
|
|
#include <xen/xenbus.h>
|
|
|
|
#include "xen_snd_front.h"
|
|
#include "xen_snd_front_alsa.h"
|
|
#include "xen_snd_front_cfg.h"
|
|
#include "xen_snd_front_evtchnl.h"
|
|
|
|
static irqreturn_t evtchnl_interrupt_req(int irq, void *dev_id)
|
|
{
|
|
struct xen_snd_front_evtchnl *channel = dev_id;
|
|
struct xen_snd_front_info *front_info = channel->front_info;
|
|
struct xensnd_resp *resp;
|
|
RING_IDX i, rp;
|
|
|
|
if (unlikely(channel->state != EVTCHNL_STATE_CONNECTED))
|
|
return IRQ_HANDLED;
|
|
|
|
mutex_lock(&channel->ring_io_lock);
|
|
|
|
again:
|
|
rp = channel->u.req.ring.sring->rsp_prod;
|
|
/* Ensure we see queued responses up to rp. */
|
|
rmb();
|
|
|
|
/*
|
|
* Assume that the backend is trusted to always write sane values
|
|
* to the ring counters, so no overflow checks on frontend side
|
|
* are required.
|
|
*/
|
|
for (i = channel->u.req.ring.rsp_cons; i != rp; i++) {
|
|
resp = RING_GET_RESPONSE(&channel->u.req.ring, i);
|
|
if (resp->id != channel->evt_id)
|
|
continue;
|
|
switch (resp->operation) {
|
|
case XENSND_OP_OPEN:
|
|
case XENSND_OP_CLOSE:
|
|
case XENSND_OP_READ:
|
|
case XENSND_OP_WRITE:
|
|
case XENSND_OP_TRIGGER:
|
|
channel->u.req.resp_status = resp->status;
|
|
complete(&channel->u.req.completion);
|
|
break;
|
|
case XENSND_OP_HW_PARAM_QUERY:
|
|
channel->u.req.resp_status = resp->status;
|
|
channel->u.req.resp.hw_param =
|
|
resp->resp.hw_param;
|
|
complete(&channel->u.req.completion);
|
|
break;
|
|
|
|
default:
|
|
dev_err(&front_info->xb_dev->dev,
|
|
"Operation %d is not supported\n",
|
|
resp->operation);
|
|
break;
|
|
}
|
|
}
|
|
|
|
channel->u.req.ring.rsp_cons = i;
|
|
if (i != channel->u.req.ring.req_prod_pvt) {
|
|
int more_to_do;
|
|
|
|
RING_FINAL_CHECK_FOR_RESPONSES(&channel->u.req.ring,
|
|
more_to_do);
|
|
if (more_to_do)
|
|
goto again;
|
|
} else {
|
|
channel->u.req.ring.sring->rsp_event = i + 1;
|
|
}
|
|
|
|
mutex_unlock(&channel->ring_io_lock);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t evtchnl_interrupt_evt(int irq, void *dev_id)
|
|
{
|
|
struct xen_snd_front_evtchnl *channel = dev_id;
|
|
struct xensnd_event_page *page = channel->u.evt.page;
|
|
u32 cons, prod;
|
|
|
|
if (unlikely(channel->state != EVTCHNL_STATE_CONNECTED))
|
|
return IRQ_HANDLED;
|
|
|
|
mutex_lock(&channel->ring_io_lock);
|
|
|
|
prod = page->in_prod;
|
|
/* Ensure we see ring contents up to prod. */
|
|
virt_rmb();
|
|
if (prod == page->in_cons)
|
|
goto out;
|
|
|
|
/*
|
|
* Assume that the backend is trusted to always write sane values
|
|
* to the ring counters, so no overflow checks on frontend side
|
|
* are required.
|
|
*/
|
|
for (cons = page->in_cons; cons != prod; cons++) {
|
|
struct xensnd_evt *event;
|
|
|
|
event = &XENSND_IN_RING_REF(page, cons);
|
|
if (unlikely(event->id != channel->evt_id++))
|
|
continue;
|
|
|
|
switch (event->type) {
|
|
case XENSND_EVT_CUR_POS:
|
|
xen_snd_front_alsa_handle_cur_pos(channel,
|
|
event->op.cur_pos.position);
|
|
break;
|
|
}
|
|
}
|
|
|
|
page->in_cons = cons;
|
|
/* Ensure ring contents. */
|
|
virt_wmb();
|
|
|
|
out:
|
|
mutex_unlock(&channel->ring_io_lock);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
void xen_snd_front_evtchnl_flush(struct xen_snd_front_evtchnl *channel)
|
|
{
|
|
int notify;
|
|
|
|
channel->u.req.ring.req_prod_pvt++;
|
|
RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&channel->u.req.ring, notify);
|
|
if (notify)
|
|
notify_remote_via_irq(channel->irq);
|
|
}
|
|
|
|
static void evtchnl_free(struct xen_snd_front_info *front_info,
|
|
struct xen_snd_front_evtchnl *channel)
|
|
{
|
|
unsigned long page = 0;
|
|
|
|
if (channel->type == EVTCHNL_TYPE_REQ)
|
|
page = (unsigned long)channel->u.req.ring.sring;
|
|
else if (channel->type == EVTCHNL_TYPE_EVT)
|
|
page = (unsigned long)channel->u.evt.page;
|
|
|
|
if (!page)
|
|
return;
|
|
|
|
channel->state = EVTCHNL_STATE_DISCONNECTED;
|
|
if (channel->type == EVTCHNL_TYPE_REQ) {
|
|
/* Release all who still waits for response if any. */
|
|
channel->u.req.resp_status = -EIO;
|
|
complete_all(&channel->u.req.completion);
|
|
}
|
|
|
|
if (channel->irq)
|
|
unbind_from_irqhandler(channel->irq, channel);
|
|
|
|
if (channel->port)
|
|
xenbus_free_evtchn(front_info->xb_dev, channel->port);
|
|
|
|
/* End access and free the page. */
|
|
if (channel->gref != GRANT_INVALID_REF)
|
|
gnttab_end_foreign_access(channel->gref, page);
|
|
else
|
|
free_page(page);
|
|
|
|
memset(channel, 0, sizeof(*channel));
|
|
}
|
|
|
|
void xen_snd_front_evtchnl_free_all(struct xen_snd_front_info *front_info)
|
|
{
|
|
int i;
|
|
|
|
if (!front_info->evt_pairs)
|
|
return;
|
|
|
|
for (i = 0; i < front_info->num_evt_pairs; i++) {
|
|
evtchnl_free(front_info, &front_info->evt_pairs[i].req);
|
|
evtchnl_free(front_info, &front_info->evt_pairs[i].evt);
|
|
}
|
|
|
|
kfree(front_info->evt_pairs);
|
|
front_info->evt_pairs = NULL;
|
|
}
|
|
|
|
static int evtchnl_alloc(struct xen_snd_front_info *front_info, int index,
|
|
struct xen_snd_front_evtchnl *channel,
|
|
enum xen_snd_front_evtchnl_type type)
|
|
{
|
|
struct xenbus_device *xb_dev = front_info->xb_dev;
|
|
unsigned long page;
|
|
grant_ref_t gref;
|
|
irq_handler_t handler;
|
|
char *handler_name = NULL;
|
|
int ret;
|
|
|
|
memset(channel, 0, sizeof(*channel));
|
|
channel->type = type;
|
|
channel->index = index;
|
|
channel->front_info = front_info;
|
|
channel->state = EVTCHNL_STATE_DISCONNECTED;
|
|
channel->gref = GRANT_INVALID_REF;
|
|
page = get_zeroed_page(GFP_KERNEL);
|
|
if (!page) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
handler_name = kasprintf(GFP_KERNEL, "%s-%s", XENSND_DRIVER_NAME,
|
|
type == EVTCHNL_TYPE_REQ ?
|
|
XENSND_FIELD_RING_REF :
|
|
XENSND_FIELD_EVT_RING_REF);
|
|
if (!handler_name) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
mutex_init(&channel->ring_io_lock);
|
|
|
|
if (type == EVTCHNL_TYPE_REQ) {
|
|
struct xen_sndif_sring *sring = (struct xen_sndif_sring *)page;
|
|
|
|
init_completion(&channel->u.req.completion);
|
|
mutex_init(&channel->u.req.req_io_lock);
|
|
SHARED_RING_INIT(sring);
|
|
FRONT_RING_INIT(&channel->u.req.ring, sring, XEN_PAGE_SIZE);
|
|
|
|
ret = xenbus_grant_ring(xb_dev, sring, 1, &gref);
|
|
if (ret < 0) {
|
|
channel->u.req.ring.sring = NULL;
|
|
goto fail;
|
|
}
|
|
|
|
handler = evtchnl_interrupt_req;
|
|
} else {
|
|
ret = gnttab_grant_foreign_access(xb_dev->otherend_id,
|
|
virt_to_gfn((void *)page), 0);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
channel->u.evt.page = (struct xensnd_event_page *)page;
|
|
gref = ret;
|
|
handler = evtchnl_interrupt_evt;
|
|
}
|
|
|
|
channel->gref = gref;
|
|
|
|
ret = xenbus_alloc_evtchn(xb_dev, &channel->port);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret = bind_evtchn_to_irq(channel->port);
|
|
if (ret < 0) {
|
|
dev_err(&xb_dev->dev,
|
|
"Failed to bind IRQ for domid %d port %d: %d\n",
|
|
front_info->xb_dev->otherend_id, channel->port, ret);
|
|
goto fail;
|
|
}
|
|
|
|
channel->irq = ret;
|
|
|
|
ret = request_threaded_irq(channel->irq, NULL, handler,
|
|
IRQF_ONESHOT, handler_name, channel);
|
|
if (ret < 0) {
|
|
dev_err(&xb_dev->dev, "Failed to request IRQ %d: %d\n",
|
|
channel->irq, ret);
|
|
goto fail;
|
|
}
|
|
|
|
kfree(handler_name);
|
|
return 0;
|
|
|
|
fail:
|
|
if (page)
|
|
free_page(page);
|
|
kfree(handler_name);
|
|
dev_err(&xb_dev->dev, "Failed to allocate ring: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
int xen_snd_front_evtchnl_create_all(struct xen_snd_front_info *front_info,
|
|
int num_streams)
|
|
{
|
|
struct xen_front_cfg_card *cfg = &front_info->cfg;
|
|
struct device *dev = &front_info->xb_dev->dev;
|
|
int d, ret = 0;
|
|
|
|
front_info->evt_pairs =
|
|
kcalloc(num_streams,
|
|
sizeof(struct xen_snd_front_evtchnl_pair),
|
|
GFP_KERNEL);
|
|
if (!front_info->evt_pairs)
|
|
return -ENOMEM;
|
|
|
|
/* Iterate over devices and their streams and create event channels. */
|
|
for (d = 0; d < cfg->num_pcm_instances; d++) {
|
|
struct xen_front_cfg_pcm_instance *pcm_instance;
|
|
int s, index;
|
|
|
|
pcm_instance = &cfg->pcm_instances[d];
|
|
|
|
for (s = 0; s < pcm_instance->num_streams_pb; s++) {
|
|
index = pcm_instance->streams_pb[s].index;
|
|
|
|
ret = evtchnl_alloc(front_info, index,
|
|
&front_info->evt_pairs[index].req,
|
|
EVTCHNL_TYPE_REQ);
|
|
if (ret < 0) {
|
|
dev_err(dev, "Error allocating control channel\n");
|
|
goto fail;
|
|
}
|
|
|
|
ret = evtchnl_alloc(front_info, index,
|
|
&front_info->evt_pairs[index].evt,
|
|
EVTCHNL_TYPE_EVT);
|
|
if (ret < 0) {
|
|
dev_err(dev, "Error allocating in-event channel\n");
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
for (s = 0; s < pcm_instance->num_streams_cap; s++) {
|
|
index = pcm_instance->streams_cap[s].index;
|
|
|
|
ret = evtchnl_alloc(front_info, index,
|
|
&front_info->evt_pairs[index].req,
|
|
EVTCHNL_TYPE_REQ);
|
|
if (ret < 0) {
|
|
dev_err(dev, "Error allocating control channel\n");
|
|
goto fail;
|
|
}
|
|
|
|
ret = evtchnl_alloc(front_info, index,
|
|
&front_info->evt_pairs[index].evt,
|
|
EVTCHNL_TYPE_EVT);
|
|
if (ret < 0) {
|
|
dev_err(dev, "Error allocating in-event channel\n");
|
|
goto fail;
|
|
}
|
|
}
|
|
}
|
|
|
|
front_info->num_evt_pairs = num_streams;
|
|
return 0;
|
|
|
|
fail:
|
|
xen_snd_front_evtchnl_free_all(front_info);
|
|
return ret;
|
|
}
|
|
|
|
static int evtchnl_publish(struct xenbus_transaction xbt,
|
|
struct xen_snd_front_evtchnl *channel,
|
|
const char *path, const char *node_ring,
|
|
const char *node_chnl)
|
|
{
|
|
struct xenbus_device *xb_dev = channel->front_info->xb_dev;
|
|
int ret;
|
|
|
|
/* Write control channel ring reference. */
|
|
ret = xenbus_printf(xbt, path, node_ring, "%u", channel->gref);
|
|
if (ret < 0) {
|
|
dev_err(&xb_dev->dev, "Error writing ring-ref: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* Write event channel ring reference. */
|
|
ret = xenbus_printf(xbt, path, node_chnl, "%u", channel->port);
|
|
if (ret < 0) {
|
|
dev_err(&xb_dev->dev, "Error writing event channel: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int xen_snd_front_evtchnl_publish_all(struct xen_snd_front_info *front_info)
|
|
{
|
|
struct xen_front_cfg_card *cfg = &front_info->cfg;
|
|
struct xenbus_transaction xbt;
|
|
int ret, d;
|
|
|
|
again:
|
|
ret = xenbus_transaction_start(&xbt);
|
|
if (ret < 0) {
|
|
xenbus_dev_fatal(front_info->xb_dev, ret,
|
|
"starting transaction");
|
|
return ret;
|
|
}
|
|
|
|
for (d = 0; d < cfg->num_pcm_instances; d++) {
|
|
struct xen_front_cfg_pcm_instance *pcm_instance;
|
|
int s, index;
|
|
|
|
pcm_instance = &cfg->pcm_instances[d];
|
|
|
|
for (s = 0; s < pcm_instance->num_streams_pb; s++) {
|
|
index = pcm_instance->streams_pb[s].index;
|
|
|
|
ret = evtchnl_publish(xbt,
|
|
&front_info->evt_pairs[index].req,
|
|
pcm_instance->streams_pb[s].xenstore_path,
|
|
XENSND_FIELD_RING_REF,
|
|
XENSND_FIELD_EVT_CHNL);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret = evtchnl_publish(xbt,
|
|
&front_info->evt_pairs[index].evt,
|
|
pcm_instance->streams_pb[s].xenstore_path,
|
|
XENSND_FIELD_EVT_RING_REF,
|
|
XENSND_FIELD_EVT_EVT_CHNL);
|
|
if (ret < 0)
|
|
goto fail;
|
|
}
|
|
|
|
for (s = 0; s < pcm_instance->num_streams_cap; s++) {
|
|
index = pcm_instance->streams_cap[s].index;
|
|
|
|
ret = evtchnl_publish(xbt,
|
|
&front_info->evt_pairs[index].req,
|
|
pcm_instance->streams_cap[s].xenstore_path,
|
|
XENSND_FIELD_RING_REF,
|
|
XENSND_FIELD_EVT_CHNL);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
ret = evtchnl_publish(xbt,
|
|
&front_info->evt_pairs[index].evt,
|
|
pcm_instance->streams_cap[s].xenstore_path,
|
|
XENSND_FIELD_EVT_RING_REF,
|
|
XENSND_FIELD_EVT_EVT_CHNL);
|
|
if (ret < 0)
|
|
goto fail;
|
|
}
|
|
}
|
|
ret = xenbus_transaction_end(xbt, 0);
|
|
if (ret < 0) {
|
|
if (ret == -EAGAIN)
|
|
goto again;
|
|
|
|
xenbus_dev_fatal(front_info->xb_dev, ret,
|
|
"completing transaction");
|
|
goto fail_to_end;
|
|
}
|
|
return 0;
|
|
fail:
|
|
xenbus_transaction_end(xbt, 1);
|
|
fail_to_end:
|
|
xenbus_dev_fatal(front_info->xb_dev, ret, "writing XenStore");
|
|
return ret;
|
|
}
|
|
|
|
void xen_snd_front_evtchnl_pair_set_connected(struct xen_snd_front_evtchnl_pair *evt_pair,
|
|
bool is_connected)
|
|
{
|
|
enum xen_snd_front_evtchnl_state state;
|
|
|
|
if (is_connected)
|
|
state = EVTCHNL_STATE_CONNECTED;
|
|
else
|
|
state = EVTCHNL_STATE_DISCONNECTED;
|
|
|
|
mutex_lock(&evt_pair->req.ring_io_lock);
|
|
evt_pair->req.state = state;
|
|
mutex_unlock(&evt_pair->req.ring_io_lock);
|
|
|
|
mutex_lock(&evt_pair->evt.ring_io_lock);
|
|
evt_pair->evt.state = state;
|
|
mutex_unlock(&evt_pair->evt.ring_io_lock);
|
|
}
|
|
|
|
void xen_snd_front_evtchnl_pair_clear(struct xen_snd_front_evtchnl_pair *evt_pair)
|
|
{
|
|
mutex_lock(&evt_pair->req.ring_io_lock);
|
|
evt_pair->req.evt_next_id = 0;
|
|
mutex_unlock(&evt_pair->req.ring_io_lock);
|
|
|
|
mutex_lock(&evt_pair->evt.ring_io_lock);
|
|
evt_pair->evt.evt_next_id = 0;
|
|
mutex_unlock(&evt_pair->evt.ring_io_lock);
|
|
}
|
|
|