--- /dev/null
+/*
+ * This file is copied from the linux kernel headers. It defines the standard
+ * interface to the xen/gntdev device.
+ *
+ */
+
+/******************************************************************************
+ * gntdev.h
+ *
+ * Interface to /dev/xen/gntdev.
+ *
+ * Copyright (c) 2007, D G Murray
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef __LINUX_PUBLIC_GNTDEV_H__
+#define __LINUX_PUBLIC_GNTDEV_H__
+
+struct ioctl_gntdev_grant_ref {
+ /* The domain ID of the grant to be mapped. */
+ uint32_t domid;
+ /* The grant reference of the grant to be mapped. */
+ uint32_t ref;
+};
+
+/*
+ * Inserts the grant references into the mapping table of an instance
+ * of gntdev. N.B. This does not perform the mapping, which is deferred
+ * until mmap() is called with @index as the offset.
+ */
+#define IOCTL_GNTDEV_MAP_GRANT_REF \
+_IOC(_IOC_NONE, 'G', 0, sizeof(struct ioctl_gntdev_map_grant_ref))
+struct ioctl_gntdev_map_grant_ref {
+ /* IN parameters */
+ /* The number of grants to be mapped. */
+ uint32_t count;
+ uint32_t pad;
+ /* OUT parameters */
+ /* The offset to be used on a subsequent call to mmap(). */
+ uint64_t index;
+ /* Variable IN parameter. */
+ /* Array of grant references, of size @count. */
+ struct ioctl_gntdev_grant_ref refs[1];
+};
+
+/*
+ * Removes the grant references from the mapping table of an instance of
+ * of gntdev. N.B. munmap() must be called on the relevant virtual address(es)
+ * before this ioctl is called, or an error will result.
+ */
+#define IOCTL_GNTDEV_UNMAP_GRANT_REF \
+_IOC(_IOC_NONE, 'G', 1, sizeof(struct ioctl_gntdev_unmap_grant_ref))
+struct ioctl_gntdev_unmap_grant_ref {
+ /* IN parameters */
+ /* The offset was returned by the corresponding map operation. */
+ uint64_t index;
+ /* The number of pages to be unmapped. */
+ uint32_t count;
+ uint32_t pad;
+};
+
+/*
+ * Returns the offset in the driver's address space that corresponds
+ * to @vaddr. This can be used to perform a munmap(), followed by an
+ * UNMAP_GRANT_REF ioctl, where no state about the offset is retained by
+ * the caller. The number of pages that were allocated at the same time as
+ * @vaddr is returned in @count.
+ *
+ * N.B. Where more than one page has been mapped into a contiguous range, the
+ * supplied @vaddr must correspond to the start of the range; otherwise
+ * an error will result. It is only possible to munmap() the entire
+ * contiguously-allocated range at once, and not any subrange thereof.
+ */
+#define IOCTL_GNTDEV_GET_OFFSET_FOR_VADDR \
+_IOC(_IOC_NONE, 'G', 2, sizeof(struct ioctl_gntdev_get_offset_for_vaddr))
+struct ioctl_gntdev_get_offset_for_vaddr {
+ /* IN parameters */
+ /* The virtual address of the first mapped page in a range. */
+ uint64_t vaddr;
+ /* OUT parameters */
+ /* The offset that was used in the initial mmap() operation. */
+ uint64_t offset;
+ /* The number of pages mapped in the VM area that begins at @vaddr. */
+ uint32_t count;
+ uint32_t pad;
+};
+
+/*
+ * Sets the maximum number of grants that may mapped at once by this gntdev
+ * instance.
+ *
+ * N.B. This must be called before any other ioctl is performed on the device.
+ */
+#define IOCTL_GNTDEV_SET_MAX_GRANTS \
+_IOC(_IOC_NONE, 'G', 3, sizeof(struct ioctl_gntdev_set_max_grants))
+struct ioctl_gntdev_set_max_grants {
+ /* IN parameter */
+ /* The maximum number of grants that may be mapped at once. */
+ uint32_t count;
+};
+
+/*
+ * Sets up an unmap notification within the page, so that the other side can do
+ * cleanup if this side crashes. Required to implement cross-domain robust
+ * mutexes or close notification on communication channels.
+ *
+ * Each mapped page only supports one notification; multiple calls referring to
+ * the same page overwrite the previous notification. You must clear the
+ * notification prior to the IOCTL_GNTALLOC_DEALLOC_GREF if you do not want it
+ * to occur.
+ */
+#define IOCTL_GNTDEV_SET_UNMAP_NOTIFY \
+_IOC(_IOC_NONE, 'G', 7, sizeof(struct ioctl_gntdev_unmap_notify))
+struct ioctl_gntdev_unmap_notify {
+ /* IN parameters */
+ /* Offset in the file descriptor for a byte within the page (same as
+ * used in mmap). If using UNMAP_NOTIFY_CLEAR_BYTE, this is the byte to
+ * be cleared. Otherwise, it can be any byte in the page whose
+ * notification we are adjusting.
+ */
+ uint64_t index;
+ /* Action(s) to take on unmap */
+ uint32_t action;
+ /* Event channel to notify */
+ uint32_t event_channel_port;
+};
+
+/* Clear (set to zero) the byte specified by index */
+#define UNMAP_NOTIFY_CLEAR_BYTE 0x1
+/* Send an interrupt on the indicated event channel */
+#define UNMAP_NOTIFY_SEND_EVENT 0x2
+
+#endif /* __LINUX_PUBLIC_GNTDEV_H__ */
--- /dev/null
+/***
+ This file is part of PulseAudio.
+
+ Copyright 2004-2006 Lennart Poettering
+ Copyright 2011 George Boutsioukis for Xen
+
+ PulseAudio is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation; either version 2.1 of the License,
+ or (at your option) any later version.
+
+ PulseAudio is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with PulseAudio; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ USA.
+***/
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <limits.h>
+#include <sys/ioctl.h>
+#include <poll.h>
+#include <time.h>
+
+#include <pulse/xmalloc.h>
+
+#include <pulsecore/core-error.h>
+#include <pulsecore/sink.h>
+#include <pulsecore/module.h>
+#include <pulsecore/core-util.h>
+#include <pulsecore/modargs.h>
+#include <pulsecore/log.h>
+#include <pulsecore/thread.h>
+#include <pulsecore/thread-mq.h>
+#include <pulsecore/rtpoll.h>
+
+#include <sys/select.h>
+#include <sys/mman.h>
+#include <xenctrl.h>
+#include <xs.h>
+
+#include "module-xenpv-sink-symdef.h"
+#include "gntalloc.h"
+#include "gntdev.h"
+
+PA_MODULE_AUTHOR("Giorgos Boutsioukis");
+PA_MODULE_DESCRIPTION("Xen PV audio sink");
+PA_MODULE_VERSION(PACKAGE_VERSION);
+PA_MODULE_LOAD_ONCE(FALSE);
+PA_MODULE_USAGE(
+ "sink_name=<name for the sink> "
+ "sink_properties=<properties for the sink> "
+ "format=<sample format> "
+ "rate=<sample rate>"
+ "channels=<number of channels> "
+ "channel_map=<channel map>");
+
+#define DEFAULT_SINK_NAME "xenpv_output"
+#define DEFAULT_FILE_NAME "xenpv_output"
+
+#define STATE_UNDEFINED 9999
+
+int device_id = -1;
+enum xenbus_state {
+ XenbusStateUnknown = 0,
+ XenbusStateInitialising = 1,
+ XenbusStateInitWait = 2,
+ XenbusStateInitialised = 3,
+ XenbusStateConnected = 4,
+ XenbusStateClosing = 5,
+ XenbusStateClosed = 6,
+ XenbusStateReconfiguring = 7,
+ XenbusStateReconfigured = 8
+};
+
+static const char* xenbus_names[] = {
+ "XenbusStateUnknown",
+ "XenbusStateInitialising",
+ "XenbusStateInitWait",
+ "XenbusStateInitialised",
+ "XenbusStateConnected",
+ "XenbusStateClosing",
+ "XenbusStateClosed",
+ "XenbusStateReconfiguring",
+ "XenbusStateReconfigured"
+};
+
+struct userdata {
+ pa_core *core;
+ pa_module *module;
+ pa_sink *sink;
+
+ pa_thread *thread;
+ pa_thread_mq thread_mq;
+ pa_rtpoll *rtpoll;
+
+ pa_memchunk memchunk;
+
+ pa_rtpoll_item *rtpoll_item;
+
+ int write_type;
+};
+
+pa_sample_spec ss;
+pa_channel_map map;
+
+/* just to test non- frame-aligned size */
+#define BUFSIZE 2047
+
+struct ring {
+ uint32_t cons_indx, prod_indx;
+ uint32_t usable_buffer_space; /* kept here for convenience */
+ uint8_t buffer[BUFSIZE];
+} *ioring;
+
+static const char* const valid_modargs[] = {
+ "sink_name",
+ "sink_properties",
+ "file",
+ "format",
+ "rate",
+ "channels",
+ "channel_map",
+ NULL
+};
+
+/* Xen globals*/
+xc_interface* xch;
+xc_evtchn* xce;
+evtchn_port_or_error_t xen_evtchn_port;
+static struct xs_handle *xsh;
+struct ioctl_gntalloc_alloc_gref gref;
+
+static int register_backend_state_watch(void);
+static int wait_for_backend_state_change(void);
+static int alloc_gref(struct ioctl_gntalloc_alloc_gref *gref, void **addr);
+static int ring_write(struct ring *r, void *src, int length);
+static int publish_spec(pa_sample_spec *ss);
+static int read_backend_default_spec(pa_sample_spec *ss);
+static int publish_param(const char *paramname, const char *value);
+static int publish_param_int(const char *paramname, const int value);
+static char* read_param(const char *paramname);
+
+static int set_state(int state) {
+ static int current_state = 0;
+ pa_log_debug("State transition %s->%s\n",
+ xenbus_names[current_state], xenbus_names[state]);
+
+ publish_param_int("state", state);
+ current_state = state;
+ return state;
+}
+#define NEGOTIATION_ERROR 2
+#define NEGOTIATION_OK 1
+
+/* negotiation callbacks */
+static int state_unknown_cb() {
+ pa_log_debug("Xen audio sink: Backend state was XenbusStateUnknown\n");
+ set_state(XenbusStateInitialising);
+
+ return 0;
+}
+
+static int state_initialising_cb() {
+ pa_log_debug("Xen audio sink: Backend state was XenbusStateInitialising\n");
+ set_state(XenbusStateInitialised);
+ return 0;
+}
+
+static int state_initwait_cb() {
+ pa_log_debug("Xen audio sink: Backend state was XenbusStateInitWait\n");
+ return 0;
+}
+
+static int state_initialised_cb() {
+ pa_log_debug("Xen audio sink: Backend state was XenbusStateInitialised\n");
+ /*Remind the backend we are ready*/
+ set_state(XenbusStateInitialised);
+ return 0;
+}
+
+static int state_connected_cb() {
+ /* The backend accepted our parameters, sweet! */
+ set_state(XenbusStateConnected);
+ pa_log_debug("Xen audio sink: Backend state was XenbusStateConnected\n");
+ return NEGOTIATION_OK;
+}
+
+static int state_closing_cb() {
+ pa_log_debug("Xen audio sink: Backend state was XenbusStateClosing\n");
+ return 0;
+}
+
+static int state_closed_cb() {
+ pa_log_debug("Xen audio sink: Backend state was XenbusStateClosed\n");
+ return 0;
+}
+
+static int state_reconfiguring_cb() {
+ /* The backend rejected our sample spec */
+ pa_log_debug("Xen audio sink: Backend state was XenbusStateReconfiguring\n");
+ /* fall back to the backend's default parameters*/
+ read_backend_default_spec(&ss);
+ /* backend should accept these now */
+ publish_spec(&ss);
+ set_state(XenbusStateInitialised);
+ return 0;
+}
+
+static int state_reconfigured_cb() {
+ pa_log_debug("Xen audio sink: Backend state was XenbusStateReconfigured\n");
+ return 0;
+}
+
+int (*state_callbacks[9])(void) = {
+ state_unknown_cb,
+ state_initialising_cb,
+ state_initwait_cb,
+ state_initialised_cb,
+ state_connected_cb,
+ state_closing_cb,
+ state_closed_cb,
+ state_reconfiguring_cb,
+ state_reconfigured_cb
+};
+
+static void xen_cleanup() {
+ char keybuf[64];
+ /*XXX hardcoded*/
+ munmap((void*)gref.index, 4096);
+
+ set_state(XenbusStateClosing);
+ /* send one last event to unblock the backend */
+ xc_evtchn_notify(xce, xen_evtchn_port);
+ /* close xen interfaces */
+ xc_evtchn_close(xce);
+ xc_interface_close(xch);
+
+ /* delete xenstore keys */
+ publish_param_int("state", XenbusStateClosed);
+ snprintf(keybuf, sizeof(keybuf), "device/audio/%d", device_id);
+ xs_rm(xsh, 0, keybuf);
+ xs_daemon_close(xsh);
+}
+
+static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
+ struct userdata *u = PA_SINK(o)->userdata;
+
+ switch (code) {
+
+ case PA_SINK_MESSAGE_GET_LATENCY: {
+ size_t n = 0;
+
+ n += u->memchunk.length;
+
+ *((pa_usec_t*) data) = pa_bytes_to_usec(n, &u->sink->sample_spec);
+ return 0;
+ }
+ }
+
+ return pa_sink_process_msg(o, code, data, offset, chunk);
+}
+
+static int process_render(struct userdata *u) {
+ pa_assert(u);
+
+
+ if (u->memchunk.length <= 0)
+ pa_sink_render(u->sink, ioring->usable_buffer_space, &u->memchunk);
+
+
+ pa_assert(u->memchunk.length > 0);
+
+ xc_evtchn_notify(xce, xen_evtchn_port);
+ for (;;) {
+ ssize_t l;
+ void *p;
+
+ p = pa_memblock_acquire(u->memchunk.memblock);
+ /* xen: write data to ring buffer & notify backend */
+ l = ring_write(ioring, (uint8_t*)p + u->memchunk.index, u->memchunk.length);
+
+ pa_memblock_release(u->memchunk.memblock);
+
+ pa_assert(l != 0);
+
+ if (l < 0) {
+ if (errno == EINTR)
+ continue;
+ else if (errno == EAGAIN)
+ return 0;
+ else {
+ pa_log("Failed to write data to FIFO: %s", pa_cstrerror(errno));
+ return -1;
+ }
+
+ } else {
+
+ u->memchunk.index += (size_t) l;
+ u->memchunk.length -= (size_t) l;
+
+ if (u->memchunk.length <= 0) {
+ pa_memblock_unref(u->memchunk.memblock);
+ pa_memchunk_reset(&u->memchunk);
+ }
+ }
+
+ return 0;
+ }
+}
+
+static void thread_func(void *userdata) {
+ struct userdata *u = userdata;
+
+ pa_assert(u);
+
+ pa_log_debug("Thread starting up");
+
+ pa_thread_mq_install(&u->thread_mq);
+
+ for(;;){
+ struct pollfd *pollfd;
+ int ret;
+
+ pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
+
+ /* Render some data and write it to the fifo */
+ if (PA_SINK_IS_OPENED(u->sink->thread_info.state)) {
+
+ if (u->sink->thread_info.rewind_requested)
+ pa_sink_process_rewind(u->sink, 0);
+
+ if (pollfd->revents) {
+ if (process_render(u) < 0)
+ goto fail;
+
+ pollfd->revents = 0;
+ }
+ }
+
+ /* Hmm, nothing to do. Let's sleep */
+
+ pollfd->events = (short) (u->sink->thread_info.state == PA_SINK_RUNNING ? POLLOUT : 0);
+
+ if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
+ goto fail;
+
+ if (ret == 0)
+ goto finish;
+
+ pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
+
+ if (pollfd->revents & ~POLLOUT) {
+ pa_log("FIFO shutdown.");
+ goto fail;
+ }
+ }
+
+fail:
+ /* If this was no regular exit from the loop we have to continue
+ * processing messages until we received PA_MESSAGE_SHUTDOWN */
+ pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
+ pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
+ pa_log_debug("Shutting down Xen...");
+ xen_cleanup();
+finish:
+ pa_log_debug("Thread shutting down");
+}
+
+int pa__init(pa_module*m) {
+
+ struct userdata *u;
+ pa_modargs *ma;
+ pa_sink_new_data data;
+ int backend_state;
+ int ret;
+ char strbuf[100];
+
+ pa_assert(m);
+
+ if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
+ pa_log("Failed to parse module arguments.");
+ goto fail;
+ }
+
+ ss = m->core->default_sample_spec;
+ map = m->core->default_channel_map;
+
+ /* user arguments override these */
+ if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
+ pa_log("Invalid sample format specification or channel map");
+ return 1;
+ }
+
+ /* Xen Basic init */
+ xsh = xs_domain_open();
+ if (xsh==NULL) {
+ pa_log("xs_domain_open failed");
+ goto fail;
+ }
+ set_state(XenbusStateUnknown);
+
+ xch = xc_interface_open(NULL, NULL, 0);
+ if (xch==0) {
+ pa_log("xc_interface_open failed");
+ goto fail;
+ }
+
+ xce = xc_evtchn_open(NULL, 0);
+ if (xce==0) {
+ pa_log("xc_evtchn_open failed");
+ goto fail;
+ }
+
+ /* use only dom0 as the backend for now */
+ xen_evtchn_port = xc_evtchn_bind_unbound_port(xce, 0);
+ if (xen_evtchn_port == 0) {
+ pa_log("xc_evtchn_bind_unbound_port failed");
+ }
+
+ /* get grant reference & map locally */
+ if (alloc_gref(&gref, (void**)&ioring)) {
+ pa_log("alloc_gref failed");
+ };
+ device_id = 0; /* hardcoded for now */
+
+ if (register_backend_state_watch()) {
+ pa_log("Xen sink: register xenstore watch failed");
+ };
+
+ publish_param_int("event-channel", xen_evtchn_port);
+ publish_param_int("ring-ref", gref.gref_ids[0]);
+
+ /* let's ask for something absurd and deal with rejection */
+ ss.rate = 192000;
+
+ publish_spec(&ss);
+
+ ret=0;
+ while (!ret) {
+ backend_state = wait_for_backend_state_change();
+ if (backend_state == STATE_UNDEFINED) {
+ pa_log("Xen Backend is taking long to respond, still waiting...");
+ continue;
+ } else if (backend_state == -1) {
+ pa_log("Error while waiting for backend: %s", strerror(errno));
+ break;
+ goto fail;
+ }
+ ret = state_callbacks[backend_state]();
+ }
+ if (ret!=NEGOTIATION_OK) {
+ pa_log("Negotiation with Xen backend failed!");
+ return 1;
+ }
+
+ pa_sample_spec_snprint(strbuf, 100, &ss);
+ pa_log_debug("Negotiation ended, the result was: %s", strbuf);
+
+ /* End of Phase 2, begin playback cycle */
+
+ u = pa_xnew0(struct userdata, 1);
+ u->core = m->core;
+ u->module = m;
+ m->userdata = u;
+ pa_memchunk_reset(&u->memchunk);
+ u->rtpoll = pa_rtpoll_new();
+ pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
+ u->write_type = 0;
+
+ /* init ring buffer */
+ ioring->prod_indx = ioring->cons_indx = 0;
+ ioring->usable_buffer_space = BUFSIZE - BUFSIZE % pa_frame_size(&ss);
+
+ pa_sink_new_data_init(&data);
+ data.driver = __FILE__;
+ data.module = m;
+ pa_sink_new_data_set_name(&data, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME));
+ pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, "xensink");
+ pa_proplist_setf(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Xen PV audio sink");
+ pa_sink_new_data_set_sample_spec(&data, &ss);
+ pa_sink_new_data_set_channel_map(&data, &map);
+
+ if (pa_modargs_get_proplist(ma, "sink_properties", data.proplist, PA_UPDATE_REPLACE) < 0) {
+ pa_log("Invalid properties");
+ pa_sink_new_data_done(&data);
+ goto fail;
+ }
+
+ u->sink = pa_sink_new(m->core, &data, PA_SINK_LATENCY);
+ pa_sink_new_data_done(&data);
+
+ if (!u->sink) {
+ pa_log("Failed to create sink.");
+ goto fail;
+ }
+
+ u->sink->parent.process_msg = sink_process_msg;
+ u->sink->userdata = u;
+
+ pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
+ pa_sink_set_rtpoll(u->sink, u->rtpoll);
+ pa_sink_set_max_request(u->sink, ioring->usable_buffer_space);
+ pa_sink_set_fixed_latency(u->sink, pa_bytes_to_usec(ioring->usable_buffer_space, &u->sink->sample_spec));
+
+ u->rtpoll_item = pa_rtpoll_item_new(u->rtpoll, PA_RTPOLL_NEVER, 1);
+
+ if (!(u->thread = pa_thread_new("xenpv-sink", thread_func, u))) {
+ pa_log("Failed to create thread.");
+ goto fail;
+ }
+
+ pa_sink_put(u->sink);
+
+ pa_modargs_free(ma);
+
+ return 0;
+
+fail:
+ if (ma)
+ pa_modargs_free(ma);
+
+ pa__done(m);
+
+ return -1;
+}
+
+int pa__get_n_used(pa_module *m) {
+ struct userdata *u;
+
+ pa_assert(m);
+ pa_assert_se(u = m->userdata);
+
+ return pa_sink_linked_by(u->sink);
+}
+
+void pa__done(pa_module*m) {
+ struct userdata *u;
+
+ pa_assert(m);
+
+ if (!(u = m->userdata))
+ return;
+
+ if (u->sink)
+ pa_sink_unlink(u->sink);
+
+ if (u->thread) {
+ pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
+ pa_thread_free(u->thread);
+ }
+
+ pa_thread_mq_done(&u->thread_mq);
+
+ if (u->sink)
+ pa_sink_unref(u->sink);
+
+ if (u->memchunk.memblock)
+ pa_memblock_unref(u->memchunk.memblock);
+
+ if (u->rtpoll_item)
+ pa_rtpoll_item_free(u->rtpoll_item);
+
+ if (u->rtpoll)
+ pa_rtpoll_free(u->rtpoll);
+
+ pa_xfree(u);
+
+ xen_cleanup();
+
+}
+
+
+static int alloc_gref(struct ioctl_gntalloc_alloc_gref *gref_, void **addr) {
+ int alloc_fd, dev_fd, rv;
+
+ alloc_fd = open("/dev/xen/gntalloc", O_RDWR);
+ if (alloc_fd<=0) {
+ perror("Could not open /dev/xen/gntalloc! Have you loaded the xen_gntalloc module?");
+ return 1;
+ }
+
+ dev_fd = open("/dev/xen/gntdev", O_RDWR);
+ if (dev_fd<=0) {
+ perror("Could not open /dev/xen/gntdev! Have you loaded the xen_gntdev module?");
+ return 1;
+ }
+
+ /* use dom0 */
+ gref_->domid = 0;
+ gref_->flags = GNTALLOC_FLAG_WRITABLE;
+ gref_->count = 1;
+
+ rv = ioctl(alloc_fd, IOCTL_GNTALLOC_ALLOC_GREF, gref_);
+ if (rv) {
+ pa_log_debug("Xen audio sink: src-add error: %s (rv=%d)\n", strerror(errno), rv);
+ return rv;
+ }
+
+ /*addr=NULL(default),length, prot, flags, fd, offset*/
+ *addr = mmap(0, 4096, PROT_READ|PROT_WRITE, MAP_SHARED, alloc_fd, gref_->index);
+ if (*addr == MAP_FAILED) {
+ *addr = 0;
+ pa_log_debug("Xen audio sink: mmap'ing shared page failed\n");
+ return rv;
+ }
+
+ pa_log_debug("Xen audio sink: Got grant #%d. Mapped locally at %Ld=%p\n",
+ gref_->gref_ids[0], (long long)gref_->index, *addr);
+
+ /* skip this for now
+ struct ioctl_gntalloc_unmap_notify uarg = {
+ .index = gref->index + offsetof(struct shr_page, notifies[0]),
+ .action = UNMAP_NOTIFY_CLEAR_BYTE
+ };
+
+ rv = ioctl(a_fd, IOCTL_GNTALLOC_SET_UNMAP_NOTIFY, &uarg);
+ if (rv)
+ pa_log_debug("gntalloc unmap notify error: %s (rv=%d)\n", strerror(errno), rv);
+ */
+
+ close(alloc_fd);
+ close(dev_fd);
+
+ return rv;
+}
+
+#define RING_FREE_BYTES ((r->usable_buffer_space - (r->prod_indx-r->cons_indx) -1) % r->usable_buffer_space)
+static int ring_write(struct ring *r, void *src, int length) {
+ int full = 0;
+ for (;;) {
+ /* free space may be split over the end of the buffer */
+ int first_chunk_size = (r->usable_buffer_space-r->prod_indx);
+ int second_chunk_size = (r->cons_indx>=r->prod_indx)? (r->cons_indx) : 0;
+ int l, fl, sl;
+
+ /* full? */
+ if (RING_FREE_BYTES==0) {
+ /*XXX hardcoded*/
+ if (full>=100) {
+ errno = EINTR;
+ return -1;
+ }
+ /*XXX hardcoded */
+ usleep(1000);
+ /* should return in 100ms max; definitely not midstream */
+ full++;
+ continue;
+ }
+
+ /* calculate lengths in case of a split buffer */
+ l = PA_MIN((int)RING_FREE_BYTES, length);
+ fl = PA_MIN(l, first_chunk_size);
+ sl = PA_MIN(l-fl, second_chunk_size);
+
+ memcpy(r->buffer+r->prod_indx, src, fl);
+ if (sl)
+ memcpy(r->buffer, ((char*)src)+fl, sl);
+ r->prod_indx = (r->prod_indx+fl+sl) % r->usable_buffer_space;
+
+ return sl+fl;
+ }
+}
+
+static int publish_param(const char *paramname, const char *value) {
+ char keybuf[128], valbuf[32];
+
+ snprintf(keybuf, sizeof keybuf, "device/audio/%d/%s", device_id, paramname);
+ snprintf(valbuf, sizeof valbuf, "%s", value);
+ return xs_write(xsh, 0, keybuf, valbuf, strlen(valbuf));
+}
+
+static int publish_param_int(const char *paramname, const int value) {
+ char keybuf[128], valbuf[32];
+ snprintf(keybuf, sizeof keybuf, "device/audio/%d/%s", device_id, paramname);
+ snprintf(valbuf, sizeof valbuf, "%d", value);
+ return xs_write(xsh, 0, keybuf, valbuf, strlen(valbuf));
+}
+
+static char* read_param(const char *paramname) {
+ char keybuf[128];
+ unsigned int len;
+ int my_domid;
+
+ my_domid = atoi(xs_read(xsh, 0, "domid", &len));
+ snprintf(keybuf, sizeof(keybuf), "/local/domain/0/backend/audio/%d/%d/%s", my_domid, device_id, paramname);
+ /* remember to free lvalue! */
+ return xs_read(xsh, 0, keybuf, &len);
+}
+
+
+static int publish_spec(pa_sample_spec *sample_spec) {
+ /* Publish spec and set state to XenbusStateInitWait*/
+ int ret;
+
+ ret = publish_param("format", pa_sample_format_to_string(sample_spec->format));
+ ret += publish_param_int("rate", sample_spec->rate);
+ ret += publish_param_int("channels", sample_spec->channels);
+
+ return ret;
+}
+
+
+static int read_backend_default_spec(pa_sample_spec *sample_spec) {
+ /* Read spec from backend */
+ char *out;
+
+ out = read_param("default-format");
+ sample_spec->format = pa_parse_sample_format(out);
+ free(out);
+
+ out = read_param("default-rate");
+ sample_spec->rate = atoi(out);
+ free(out);
+
+ out = read_param("default-channels");
+ sample_spec->channels = atoi(out);
+ free(out);
+
+ return 0;
+}
+
+static int register_backend_state_watch() {
+ char keybuf[128];
+ int my_domid;
+ unsigned int len;
+
+ my_domid = atoi(xs_read(xsh, 0, "domid", &len));
+ snprintf(keybuf, sizeof(keybuf), "/local/domain/0/backend/audio/%d/%d/state", my_domid, device_id);
+ if (!xs_watch(xsh, keybuf, "xenpvaudiofrontendsinktoken")) {
+ perror("xs_watch failed");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int wait_for_backend_state_change() {
+ char keybuf[128];
+ int my_domid;
+ unsigned int len;
+
+ int backend_state;
+ int seconds;
+ char *buf, **vec;
+ int ret;
+
+ int xs_fd;
+ struct timeval tv;
+ fd_set watch_fdset;
+ int start, now;
+
+ backend_state = STATE_UNDEFINED;
+ xs_fd = xs_fileno(xsh);
+ start = now = time(NULL);
+
+ my_domid = atoi(xs_read(xsh, 0, "domid", &len));
+ snprintf(keybuf, sizeof(keybuf), "/local/domain/0/backend/audio/%d/%d/state", my_domid, device_id);
+
+ /*XXX: hardcoded */
+ seconds = 10;
+ do {
+ tv.tv_usec = 0;
+ tv.tv_sec = (start + seconds) - now;
+ FD_ZERO(&watch_fdset);
+ FD_SET(xs_fd, &watch_fdset);
+ ret=select(xs_fd + 1, &watch_fdset, NULL, NULL, &tv);
+
+ if (ret==-1)
+ /* error */
+ return -1;
+ else if (ret) {
+
+ /* Read the watch to drain the buffer */
+ vec = xs_read_watch(xsh, &len);
+
+ buf = xs_read(xsh, XBT_NULL, vec[0], &len);
+ if (buf == 0) {
+ /* usually means that the backend isn't there yet */
+ continue;
+ };
+ backend_state = atoi(buf);
+
+ free(buf);
+ free(vec);
+ }
+ /* else: timeout */
+ } while (backend_state == STATE_UNDEFINED && \
+ (now = time(NULL)) < start + seconds);
+
+ return backend_state;
+}