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|
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/* Copyright (c) 2010-2012 Broadcom. All rights reserved. */
#include "vchiq_core.h"
#define VCHIQ_SLOT_HANDLER_STACK 8192
#define HANDLE_STATE_SHIFT 12
#define SLOT_INFO_FROM_INDEX(state, index) (state->slot_info + (index))
#define SLOT_DATA_FROM_INDEX(state, index) (state->slot_data + (index))
#define SLOT_INDEX_FROM_DATA(state, data) \
(((unsigned int)((char *)data - (char *)state->slot_data)) / \
VCHIQ_SLOT_SIZE)
#define SLOT_INDEX_FROM_INFO(state, info) \
((unsigned int)(info - state->slot_info))
#define SLOT_QUEUE_INDEX_FROM_POS(pos) \
((int)((unsigned int)(pos) / VCHIQ_SLOT_SIZE))
#define BULK_INDEX(x) (x & (VCHIQ_NUM_SERVICE_BULKS - 1))
#define SRVTRACE_LEVEL(srv) \
(((srv) && (srv)->trace) ? VCHIQ_LOG_TRACE : vchiq_core_msg_log_level)
#define SRVTRACE_ENABLED(srv, lev) \
(((srv) && (srv)->trace) || (vchiq_core_msg_log_level >= (lev)))
struct vchiq_open_payload {
int fourcc;
int client_id;
short version;
short version_min;
};
struct vchiq_openack_payload {
short version;
};
enum {
QMFLAGS_IS_BLOCKING = (1 << 0),
QMFLAGS_NO_MUTEX_LOCK = (1 << 1),
QMFLAGS_NO_MUTEX_UNLOCK = (1 << 2)
};
/* we require this for consistency between endpoints */
vchiq_static_assert(sizeof(struct vchiq_header) == 8);
vchiq_static_assert(IS_POW2(sizeof(struct vchiq_header)));
vchiq_static_assert(IS_POW2(VCHIQ_NUM_CURRENT_BULKS));
vchiq_static_assert(IS_POW2(VCHIQ_NUM_SERVICE_BULKS));
vchiq_static_assert(IS_POW2(VCHIQ_MAX_SERVICES));
vchiq_static_assert(VCHIQ_VERSION >= VCHIQ_VERSION_MIN);
/* Run time control of log level, based on KERN_XXX level. */
int vchiq_core_log_level = VCHIQ_LOG_DEFAULT;
int vchiq_core_msg_log_level = VCHIQ_LOG_DEFAULT;
int vchiq_sync_log_level = VCHIQ_LOG_DEFAULT;
static DEFINE_SPINLOCK(service_spinlock);
DEFINE_SPINLOCK(bulk_waiter_spinlock);
static DEFINE_SPINLOCK(quota_spinlock);
struct vchiq_state *vchiq_states[VCHIQ_MAX_STATES];
static unsigned int handle_seq;
static const char *const srvstate_names[] = {
"FREE",
"HIDDEN",
"LISTENING",
"OPENING",
"OPEN",
"OPENSYNC",
"CLOSESENT",
"CLOSERECVD",
"CLOSEWAIT",
"CLOSED"
};
static const char *const reason_names[] = {
"SERVICE_OPENED",
"SERVICE_CLOSED",
"MESSAGE_AVAILABLE",
"BULK_TRANSMIT_DONE",
"BULK_RECEIVE_DONE",
"BULK_TRANSMIT_ABORTED",
"BULK_RECEIVE_ABORTED"
};
static const char *const conn_state_names[] = {
"DISCONNECTED",
"CONNECTING",
"CONNECTED",
"PAUSING",
"PAUSE_SENT",
"PAUSED",
"RESUMING",
"PAUSE_TIMEOUT",
"RESUME_TIMEOUT"
};
static void
release_message_sync(struct vchiq_state *state, struct vchiq_header *header);
static const char *msg_type_str(unsigned int msg_type)
{
switch (msg_type) {
case VCHIQ_MSG_PADDING: return "PADDING";
case VCHIQ_MSG_CONNECT: return "CONNECT";
case VCHIQ_MSG_OPEN: return "OPEN";
case VCHIQ_MSG_OPENACK: return "OPENACK";
case VCHIQ_MSG_CLOSE: return "CLOSE";
case VCHIQ_MSG_DATA: return "DATA";
case VCHIQ_MSG_BULK_RX: return "BULK_RX";
case VCHIQ_MSG_BULK_TX: return "BULK_TX";
case VCHIQ_MSG_BULK_RX_DONE: return "BULK_RX_DONE";
case VCHIQ_MSG_BULK_TX_DONE: return "BULK_TX_DONE";
case VCHIQ_MSG_PAUSE: return "PAUSE";
case VCHIQ_MSG_RESUME: return "RESUME";
case VCHIQ_MSG_REMOTE_USE: return "REMOTE_USE";
case VCHIQ_MSG_REMOTE_RELEASE: return "REMOTE_RELEASE";
case VCHIQ_MSG_REMOTE_USE_ACTIVE: return "REMOTE_USE_ACTIVE";
}
return "???";
}
static inline void
vchiq_set_service_state(struct vchiq_service *service, int newstate)
{
vchiq_log_info(vchiq_core_log_level, "%d: srv:%d %s->%s",
service->state->id, service->localport,
srvstate_names[service->srvstate],
srvstate_names[newstate]);
service->srvstate = newstate;
}
struct vchiq_service *
find_service_by_handle(unsigned int handle)
{
struct vchiq_service *service;
spin_lock(&service_spinlock);
service = handle_to_service(handle);
if (service && service->srvstate != VCHIQ_SRVSTATE_FREE &&
service->handle == handle) {
WARN_ON(service->ref_count == 0);
service->ref_count++;
} else
service = NULL;
spin_unlock(&service_spinlock);
if (!service)
vchiq_log_info(vchiq_core_log_level,
"Invalid service handle 0x%x", handle);
return service;
}
struct vchiq_service *
find_service_by_port(struct vchiq_state *state, int localport)
{
struct vchiq_service *service = NULL;
if ((unsigned int)localport <= VCHIQ_PORT_MAX) {
spin_lock(&service_spinlock);
service = state->services[localport];
if (service && service->srvstate != VCHIQ_SRVSTATE_FREE) {
WARN_ON(service->ref_count == 0);
service->ref_count++;
} else
service = NULL;
spin_unlock(&service_spinlock);
}
if (!service)
vchiq_log_info(vchiq_core_log_level,
"Invalid port %d", localport);
return service;
}
struct vchiq_service *
find_service_for_instance(struct vchiq_instance *instance,
unsigned int handle)
{
struct vchiq_service *service;
spin_lock(&service_spinlock);
service = handle_to_service(handle);
if (service && service->srvstate != VCHIQ_SRVSTATE_FREE &&
service->handle == handle &&
service->instance == instance) {
WARN_ON(service->ref_count == 0);
service->ref_count++;
} else
service = NULL;
spin_unlock(&service_spinlock);
if (!service)
vchiq_log_info(vchiq_core_log_level,
"Invalid service handle 0x%x", handle);
return service;
}
struct vchiq_service *
find_closed_service_for_instance(struct vchiq_instance *instance,
unsigned int handle)
{
struct vchiq_service *service;
spin_lock(&service_spinlock);
service = handle_to_service(handle);
if (service &&
(service->srvstate == VCHIQ_SRVSTATE_FREE ||
service->srvstate == VCHIQ_SRVSTATE_CLOSED) &&
service->handle == handle &&
service->instance == instance) {
WARN_ON(service->ref_count == 0);
service->ref_count++;
} else
service = NULL;
spin_unlock(&service_spinlock);
if (!service)
vchiq_log_info(vchiq_core_log_level,
"Invalid service handle 0x%x", handle);
return service;
}
struct vchiq_service *
next_service_by_instance(struct vchiq_state *state, struct vchiq_instance *instance,
int *pidx)
{
struct vchiq_service *service = NULL;
int idx = *pidx;
spin_lock(&service_spinlock);
while (idx < state->unused_service) {
struct vchiq_service *srv = state->services[idx++];
if (srv && srv->srvstate != VCHIQ_SRVSTATE_FREE &&
srv->instance == instance) {
service = srv;
WARN_ON(service->ref_count == 0);
service->ref_count++;
break;
}
}
spin_unlock(&service_spinlock);
*pidx = idx;
return service;
}
void
lock_service(struct vchiq_service *service)
{
spin_lock(&service_spinlock);
WARN_ON(!service);
if (service) {
WARN_ON(service->ref_count == 0);
service->ref_count++;
}
spin_unlock(&service_spinlock);
}
void
unlock_service(struct vchiq_service *service)
{
spin_lock(&service_spinlock);
if (!service) {
WARN(1, "%s: service is NULL\n", __func__);
goto unlock;
}
if (!service->ref_count) {
WARN(1, "%s: ref_count is zero\n", __func__);
goto unlock;
}
service->ref_count--;
if (!service->ref_count) {
struct vchiq_state *state = service->state;
WARN_ON(service->srvstate != VCHIQ_SRVSTATE_FREE);
state->services[service->localport] = NULL;
} else {
service = NULL;
}
unlock:
spin_unlock(&service_spinlock);
if (service && service->userdata_term)
service->userdata_term(service->base.userdata);
kfree(service);
}
int
vchiq_get_client_id(unsigned int handle)
{
struct vchiq_service *service = find_service_by_handle(handle);
int id;
id = service ? service->client_id : 0;
if (service)
unlock_service(service);
return id;
}
void *
vchiq_get_service_userdata(unsigned int handle)
{
struct vchiq_service *service = handle_to_service(handle);
return service ? service->base.userdata : NULL;
}
static void
mark_service_closing_internal(struct vchiq_service *service, int sh_thread)
{
struct vchiq_state *state = service->state;
struct vchiq_service_quota *service_quota;
service->closing = 1;
/* Synchronise with other threads. */
mutex_lock(&state->recycle_mutex);
mutex_unlock(&state->recycle_mutex);
if (!sh_thread || (state->conn_state != VCHIQ_CONNSTATE_PAUSE_SENT)) {
/* If we're pausing then the slot_mutex is held until resume
* by the slot handler. Therefore don't try to acquire this
* mutex if we're the slot handler and in the pause sent state.
* We don't need to in this case anyway. */
mutex_lock(&state->slot_mutex);
mutex_unlock(&state->slot_mutex);
}
/* Unblock any sending thread. */
service_quota = &state->service_quotas[service->localport];
complete(&service_quota->quota_event);
}
static void
mark_service_closing(struct vchiq_service *service)
{
mark_service_closing_internal(service, 0);
}
static inline enum vchiq_status
make_service_callback(struct vchiq_service *service, enum vchiq_reason reason,
struct vchiq_header *header, void *bulk_userdata)
{
enum vchiq_status status;
vchiq_log_trace(vchiq_core_log_level, "%d: callback:%d (%s, %pK, %pK)",
service->state->id, service->localport, reason_names[reason],
header, bulk_userdata);
status = service->base.callback(reason, header, service->handle,
bulk_userdata);
if (status == VCHIQ_ERROR) {
vchiq_log_warning(vchiq_core_log_level,
"%d: ignoring ERROR from callback to service %x",
service->state->id, service->handle);
status = VCHIQ_SUCCESS;
}
return status;
}
inline void
vchiq_set_conn_state(struct vchiq_state *state, enum vchiq_connstate newstate)
{
enum vchiq_connstate oldstate = state->conn_state;
vchiq_log_info(vchiq_core_log_level, "%d: %s->%s", state->id,
conn_state_names[oldstate],
conn_state_names[newstate]);
state->conn_state = newstate;
vchiq_platform_conn_state_changed(state, oldstate, newstate);
}
static inline void
remote_event_create(wait_queue_head_t *wq, struct remote_event *event)
{
event->armed = 0;
/* Don't clear the 'fired' flag because it may already have been set
** by the other side. */
init_waitqueue_head(wq);
}
/*
* All the event waiting routines in VCHIQ used a custom semaphore
* implementation that filtered most signals. This achieved a behaviour similar
* to the "killable" family of functions. While cleaning up this code all the
* routines where switched to the "interruptible" family of functions, as the
* former was deemed unjustified and the use "killable" set all VCHIQ's
* threads in D state.
*/
static inline int
remote_event_wait(wait_queue_head_t *wq, struct remote_event *event)
{
if (!event->fired) {
event->armed = 1;
dsb(sy);
if (wait_event_interruptible(*wq, event->fired)) {
event->armed = 0;
return 0;
}
event->armed = 0;
wmb();
}
event->fired = 0;
return 1;
}
static inline void
remote_event_signal_local(wait_queue_head_t *wq, struct remote_event *event)
{
event->fired = 1;
event->armed = 0;
wake_up_all(wq);
}
static inline void
remote_event_poll(wait_queue_head_t *wq, struct remote_event *event)
{
if (event->fired && event->armed)
remote_event_signal_local(wq, event);
}
void
remote_event_pollall(struct vchiq_state *state)
{
remote_event_poll(&state->sync_trigger_event, &state->local->sync_trigger);
remote_event_poll(&state->sync_release_event, &state->local->sync_release);
remote_event_poll(&state->trigger_event, &state->local->trigger);
remote_event_poll(&state->recycle_event, &state->local->recycle);
}
/* Round up message sizes so that any space at the end of a slot is always big
** enough for a header. This relies on header size being a power of two, which
** has been verified earlier by a static assertion. */
static inline size_t
calc_stride(size_t size)
{
/* Allow room for the header */
size += sizeof(struct vchiq_header);
/* Round up */
return (size + sizeof(struct vchiq_header) - 1) &
~(sizeof(struct vchiq_header) - 1);
}
/* Called by the slot handler thread */
static struct vchiq_service *
get_listening_service(struct vchiq_state *state, int fourcc)
{
int i;
WARN_ON(fourcc == VCHIQ_FOURCC_INVALID);
for (i = 0; i < state->unused_service; i++) {
struct vchiq_service *service = state->services[i];
if (service &&
service->public_fourcc == fourcc &&
(service->srvstate == VCHIQ_SRVSTATE_LISTENING ||
(service->srvstate == VCHIQ_SRVSTATE_OPEN &&
service->remoteport == VCHIQ_PORT_FREE))) {
lock_service(service);
return service;
}
}
return NULL;
}
/* Called by the slot handler thread */
static struct vchiq_service *
get_connected_service(struct vchiq_state *state, unsigned int port)
{
int i;
for (i = 0; i < state->unused_service; i++) {
struct vchiq_service *service = state->services[i];
if (service && service->srvstate == VCHIQ_SRVSTATE_OPEN &&
service->remoteport == port) {
lock_service(service);
return service;
}
}
return NULL;
}
inline void
request_poll(struct vchiq_state *state, struct vchiq_service *service,
int poll_type)
{
u32 value;
if (service) {
do {
value = atomic_read(&service->poll_flags);
} while (atomic_cmpxchg(&service->poll_flags, value,
value | (1 << poll_type)) != value);
do {
value = atomic_read(&state->poll_services[
service->localport>>5]);
} while (atomic_cmpxchg(
&state->poll_services[service->localport>>5],
value, value | (1 << (service->localport & 0x1f)))
!= value);
}
state->poll_needed = 1;
wmb();
/* ... and ensure the slot handler runs. */
remote_event_signal_local(&state->trigger_event, &state->local->trigger);
}
/* Called from queue_message, by the slot handler and application threads,
** with slot_mutex held */
static struct vchiq_header *
reserve_space(struct vchiq_state *state, size_t space, int is_blocking)
{
struct vchiq_shared_state *local = state->local;
int tx_pos = state->local_tx_pos;
int slot_space = VCHIQ_SLOT_SIZE - (tx_pos & VCHIQ_SLOT_MASK);
if (space > slot_space) {
struct vchiq_header *header;
/* Fill the remaining space with padding */
WARN_ON(!state->tx_data);
header = (struct vchiq_header *)
(state->tx_data + (tx_pos & VCHIQ_SLOT_MASK));
header->msgid = VCHIQ_MSGID_PADDING;
header->size = slot_space - sizeof(struct vchiq_header);
tx_pos += slot_space;
}
/* If necessary, get the next slot. */
if ((tx_pos & VCHIQ_SLOT_MASK) == 0) {
int slot_index;
/* If there is no free slot... */
if (!try_wait_for_completion(&state->slot_available_event)) {
/* ...wait for one. */
VCHIQ_STATS_INC(state, slot_stalls);
/* But first, flush through the last slot. */
state->local_tx_pos = tx_pos;
local->tx_pos = tx_pos;
remote_event_signal(&state->remote->trigger);
if (!is_blocking ||
(wait_for_completion_interruptible(
&state->slot_available_event)))
return NULL; /* No space available */
}
if (tx_pos == (state->slot_queue_available * VCHIQ_SLOT_SIZE)) {
complete(&state->slot_available_event);
pr_warn("%s: invalid tx_pos: %d\n", __func__, tx_pos);
return NULL;
}
slot_index = local->slot_queue[
SLOT_QUEUE_INDEX_FROM_POS(tx_pos) &
VCHIQ_SLOT_QUEUE_MASK];
state->tx_data =
(char *)SLOT_DATA_FROM_INDEX(state, slot_index);
}
state->local_tx_pos = tx_pos + space;
return (struct vchiq_header *)(state->tx_data +
(tx_pos & VCHIQ_SLOT_MASK));
}
/* Called by the recycle thread. */
static void
process_free_queue(struct vchiq_state *state, BITSET_T *service_found,
size_t length)
{
struct vchiq_shared_state *local = state->local;
int slot_queue_available;
/* Find slots which have been freed by the other side, and return them
** to the available queue. */
slot_queue_available = state->slot_queue_available;
/*
* Use a memory barrier to ensure that any state that may have been
* modified by another thread is not masked by stale prefetched
* values.
*/
mb();
while (slot_queue_available != local->slot_queue_recycle) {
unsigned int pos;
int slot_index = local->slot_queue[slot_queue_available++ &
VCHIQ_SLOT_QUEUE_MASK];
char *data = (char *)SLOT_DATA_FROM_INDEX(state, slot_index);
int data_found = 0;
/*
* Beware of the address dependency - data is calculated
* using an index written by the other side.
*/
rmb();
vchiq_log_trace(vchiq_core_log_level, "%d: pfq %d=%pK %x %x",
state->id, slot_index, data,
local->slot_queue_recycle, slot_queue_available);
/* Initialise the bitmask for services which have used this
** slot */
memset(service_found, 0, length);
pos = 0;
while (pos < VCHIQ_SLOT_SIZE) {
struct vchiq_header *header =
(struct vchiq_header *)(data + pos);
int msgid = header->msgid;
if (VCHIQ_MSG_TYPE(msgid) == VCHIQ_MSG_DATA) {
int port = VCHIQ_MSG_SRCPORT(msgid);
struct vchiq_service_quota *service_quota =
&state->service_quotas[port];
int count;
spin_lock("a_spinlock);
count = service_quota->message_use_count;
if (count > 0)
service_quota->message_use_count =
count - 1;
spin_unlock("a_spinlock);
if (count == service_quota->message_quota)
/* Signal the service that it
** has dropped below its quota
*/
complete(&service_quota->quota_event);
else if (count == 0) {
vchiq_log_error(vchiq_core_log_level,
"service %d message_use_count=%d (header %pK, msgid %x, header->msgid %x, header->size %x)",
port,
service_quota->message_use_count,
header, msgid, header->msgid,
header->size);
WARN(1, "invalid message use count\n");
}
if (!BITSET_IS_SET(service_found, port)) {
/* Set the found bit for this service */
BITSET_SET(service_found, port);
spin_lock("a_spinlock);
count = service_quota->slot_use_count;
if (count > 0)
service_quota->slot_use_count =
count - 1;
spin_unlock("a_spinlock);
if (count > 0) {
/* Signal the service in case
** it has dropped below its
** quota */
complete(&service_quota->quota_event);
vchiq_log_trace(
vchiq_core_log_level,
"%d: pfq:%d %x@%pK - slot_use->%d",
state->id, port,
header->size, header,
count - 1);
} else {
vchiq_log_error(
vchiq_core_log_level,
"service %d slot_use_count=%d (header %pK, msgid %x, header->msgid %x, header->size %x)",
port, count, header,
msgid, header->msgid,
header->size);
WARN(1, "bad slot use count\n");
}
}
data_found = 1;
}
pos += calc_stride(header->size);
if (pos > VCHIQ_SLOT_SIZE) {
vchiq_log_error(vchiq_core_log_level,
"pfq - pos %x: header %pK, msgid %x, header->msgid %x, header->size %x",
pos, header, msgid, header->msgid,
header->size);
WARN(1, "invalid slot position\n");
}
}
if (data_found) {
int count;
spin_lock("a_spinlock);
count = state->data_use_count;
if (count > 0)
state->data_use_count =
count - 1;
spin_unlock("a_spinlock);
if (count == state->data_quota)
complete(&state->data_quota_event);
}
/*
* Don't allow the slot to be reused until we are no
* longer interested in it.
*/
mb();
state->slot_queue_available = slot_queue_available;
complete(&state->slot_available_event);
}
}
static ssize_t
memcpy_copy_callback(
void *context, void *dest,
size_t offset, size_t maxsize)
{
memcpy(dest + offset, context + offset, maxsize);
return maxsize;
}
static ssize_t
copy_message_data(
ssize_t (*copy_callback)(void *context, void *dest,
size_t offset, size_t maxsize),
void *context,
void *dest,
size_t size)
{
size_t pos = 0;
while (pos < size) {
ssize_t callback_result;
size_t max_bytes = size - pos;
callback_result =
copy_callback(context, dest + pos,
pos, max_bytes);
if (callback_result < 0)
return callback_result;
if (!callback_result)
return -EIO;
if (callback_result > max_bytes)
return -EIO;
pos += callback_result;
}
return size;
}
/* Called by the slot handler and application threads */
static enum vchiq_status
queue_message(struct vchiq_state *state, struct vchiq_service *service,
int msgid,
ssize_t (*copy_callback)(void *context, void *dest,
size_t offset, size_t maxsize),
void *context, size_t size, int flags)
{
struct vchiq_shared_state *local;
struct vchiq_service_quota *service_quota = NULL;
struct vchiq_header *header;
int type = VCHIQ_MSG_TYPE(msgid);
size_t stride;
local = state->local;
stride = calc_stride(size);
WARN_ON(!(stride <= VCHIQ_SLOT_SIZE));
if (!(flags & QMFLAGS_NO_MUTEX_LOCK) &&
mutex_lock_killable(&state->slot_mutex))
return VCHIQ_RETRY;
if (type == VCHIQ_MSG_DATA) {
int tx_end_index;
if (!service) {
WARN(1, "%s: service is NULL\n", __func__);
mutex_unlock(&state->slot_mutex);
return VCHIQ_ERROR;
}
WARN_ON(flags & (QMFLAGS_NO_MUTEX_LOCK |
QMFLAGS_NO_MUTEX_UNLOCK));
if (service->closing) {
/* The service has been closed */
mutex_unlock(&state->slot_mutex);
return VCHIQ_ERROR;
}
service_quota = &state->service_quotas[service->localport];
spin_lock("a_spinlock);
/* Ensure this service doesn't use more than its quota of
** messages or slots */
tx_end_index = SLOT_QUEUE_INDEX_FROM_POS(
state->local_tx_pos + stride - 1);
/* Ensure data messages don't use more than their quota of
** slots */
while ((tx_end_index != state->previous_data_index) &&
(state->data_use_count == state->data_quota)) {
VCHIQ_STATS_INC(state, data_stalls);
spin_unlock("a_spinlock);
mutex_unlock(&state->slot_mutex);
if (wait_for_completion_interruptible(
&state->data_quota_event))
return VCHIQ_RETRY;
mutex_lock(&state->slot_mutex);
spin_lock("a_spinlock);
tx_end_index = SLOT_QUEUE_INDEX_FROM_POS(
state->local_tx_pos + stride - 1);
if ((tx_end_index == state->previous_data_index) ||
(state->data_use_count < state->data_quota)) {
/* Pass the signal on to other waiters */
complete(&state->data_quota_event);
break;
}
}
while ((service_quota->message_use_count ==
service_quota->message_quota) ||
((tx_end_index != service_quota->previous_tx_index) &&
(service_quota->slot_use_count ==
service_quota->slot_quota))) {
spin_unlock("a_spinlock);
vchiq_log_trace(vchiq_core_log_level,
"%d: qm:%d %s,%zx - quota stall "
"(msg %d, slot %d)",
state->id, service->localport,
msg_type_str(type), size,
service_quota->message_use_count,
service_quota->slot_use_count);
VCHIQ_SERVICE_STATS_INC(service, quota_stalls);
mutex_unlock(&state->slot_mutex);
if (wait_for_completion_interruptible(
&service_quota->quota_event))
return VCHIQ_RETRY;
if (service->closing)
return VCHIQ_ERROR;
if (mutex_lock_killable(&state->slot_mutex))
return VCHIQ_RETRY;
if (service->srvstate != VCHIQ_SRVSTATE_OPEN) {
/* The service has been closed */
mutex_unlock(&state->slot_mutex);
return VCHIQ_ERROR;
}
spin_lock("a_spinlock);
tx_end_index = SLOT_QUEUE_INDEX_FROM_POS(
state->local_tx_pos + stride - 1);
}
spin_unlock("a_spinlock);
}
header = reserve_space(state, stride, flags & QMFLAGS_IS_BLOCKING);
if (!header) {
if (service)
VCHIQ_SERVICE_STATS_INC(service, slot_stalls);
/* In the event of a failure, return the mutex to the
state it was in */
if (!(flags & QMFLAGS_NO_MUTEX_LOCK))
mutex_unlock(&state->slot_mutex);
return VCHIQ_RETRY;
}
if (type == VCHIQ_MSG_DATA) {
ssize_t callback_result;
int tx_end_index;
int slot_use_count;
vchiq_log_info(vchiq_core_log_level,
"%d: qm %s@%pK,%zx (%d->%d)",
state->id, msg_type_str(VCHIQ_MSG_TYPE(msgid)),
header, size, VCHIQ_MSG_SRCPORT(msgid),
VCHIQ_MSG_DSTPORT(msgid));
WARN_ON(flags & (QMFLAGS_NO_MUTEX_LOCK |
QMFLAGS_NO_MUTEX_UNLOCK));
callback_result =
copy_message_data(copy_callback, context,
header->data, size);
if (callback_result < 0) {
mutex_unlock(&state->slot_mutex);
VCHIQ_SERVICE_STATS_INC(service,
error_count);
return VCHIQ_ERROR;
}
if (SRVTRACE_ENABLED(service,
VCHIQ_LOG_INFO))
vchiq_log_dump_mem("Sent", 0,
header->data,
min((size_t)16,
(size_t)callback_result));
spin_lock("a_spinlock);
service_quota->message_use_count++;
tx_end_index =
SLOT_QUEUE_INDEX_FROM_POS(state->local_tx_pos - 1);
/* If this transmission can't fit in the last slot used by any
** service, the data_use_count must be increased. */
if (tx_end_index != state->previous_data_index) {
state->previous_data_index = tx_end_index;
state->data_use_count++;
}
/* If this isn't the same slot last used by this service,
** the service's slot_use_count must be increased. */
if (tx_end_index != service_quota->previous_tx_index) {
service_quota->previous_tx_index = tx_end_index;
slot_use_count = ++service_quota->slot_use_count;
} else {
slot_use_count = 0;
}
spin_unlock("a_spinlock);
if (slot_use_count)
vchiq_log_trace(vchiq_core_log_level,
"%d: qm:%d %s,%zx - slot_use->%d (hdr %p)",
state->id, service->localport,
msg_type_str(VCHIQ_MSG_TYPE(msgid)), size,
slot_use_count, header);
VCHIQ_SERVICE_STATS_INC(service, ctrl_tx_count);
VCHIQ_SERVICE_STATS_ADD(service, ctrl_tx_bytes, size);
} else {
vchiq_log_info(vchiq_core_log_level,
"%d: qm %s@%pK,%zx (%d->%d)", state->id,
msg_type_str(VCHIQ_MSG_TYPE(msgid)),
header, size, VCHIQ_MSG_SRCPORT(msgid),
VCHIQ_MSG_DSTPORT(msgid));
if (size != 0) {
/* It is assumed for now that this code path
* only happens from calls inside this file.
*
* External callers are through the vchiq_queue_message
* path which always sets the type to be VCHIQ_MSG_DATA
*
* At first glance this appears to be correct but
* more review is needed.
*/
copy_message_data(copy_callback, context,
header->data, size);
}
VCHIQ_STATS_INC(state, ctrl_tx_count);
}
header->msgid = msgid;
header->size = size;
{
int svc_fourcc;
svc_fourcc = service
? service->base.fourcc
: VCHIQ_MAKE_FOURCC('?', '?', '?', '?');
vchiq_log_info(SRVTRACE_LEVEL(service),
"Sent Msg %s(%u) to %c%c%c%c s:%u d:%d len:%zu",
msg_type_str(VCHIQ_MSG_TYPE(msgid)),
VCHIQ_MSG_TYPE(msgid),
VCHIQ_FOURCC_AS_4CHARS(svc_fourcc),
VCHIQ_MSG_SRCPORT(msgid),
VCHIQ_MSG_DSTPORT(msgid),
size);
}
/* Make sure the new header is visible to the peer. */
wmb();
/* Make the new tx_pos visible to the peer. */
local->tx_pos = state->local_tx_pos;
wmb();
if (service && (type == VCHIQ_MSG_CLOSE))
vchiq_set_service_state(service, VCHIQ_SRVSTATE_CLOSESENT);
if (!(flags & QMFLAGS_NO_MUTEX_UNLOCK))
mutex_unlock(&state->slot_mutex);
remote_event_signal(&state->remote->trigger);
return VCHIQ_SUCCESS;
}
/* Called by the slot handler and application threads */
static enum vchiq_status
queue_message_sync(struct vchiq_state *state, struct vchiq_service *service,
int msgid,
ssize_t (*copy_callback)(void *context, void *dest,
size_t offset, size_t maxsize),
void *context, int size, int is_blocking)
{
struct vchiq_shared_state *local;
struct vchiq_header *header;
ssize_t callback_result;
local = state->local;
if (VCHIQ_MSG_TYPE(msgid) != VCHIQ_MSG_RESUME &&
mutex_lock_killable(&state->sync_mutex))
return VCHIQ_RETRY;
remote_event_wait(&state->sync_release_event, &local->sync_release);
rmb();
header = (struct vchiq_header *)SLOT_DATA_FROM_INDEX(state,
local->slot_sync);
{
int oldmsgid = header->msgid;
if (oldmsgid != VCHIQ_MSGID_PADDING)
vchiq_log_error(vchiq_core_log_level,
"%d: qms - msgid %x, not PADDING",
state->id, oldmsgid);
}
vchiq_log_info(vchiq_sync_log_level,
"%d: qms %s@%pK,%x (%d->%d)", state->id,
msg_type_str(VCHIQ_MSG_TYPE(msgid)),
header, size, VCHIQ_MSG_SRCPORT(msgid),
VCHIQ_MSG_DSTPORT(msgid));
callback_result =
copy_message_data(copy_callback, context,
header->data, size);
if (callback_result < 0) {
mutex_unlock(&state->slot_mutex);
VCHIQ_SERVICE_STATS_INC(service,
error_count);
return VCHIQ_ERROR;
}
if (service) {
if (SRVTRACE_ENABLED(service,
VCHIQ_LOG_INFO))
vchiq_log_dump_mem("Sent", 0,
header->data,
min((size_t)16,
(size_t)callback_result));
VCHIQ_SERVICE_STATS_INC(service, ctrl_tx_count);
VCHIQ_SERVICE_STATS_ADD(service, ctrl_tx_bytes, size);
} else {
VCHIQ_STATS_INC(state, ctrl_tx_count);
}
header->size = size;
header->msgid = msgid;
if (vchiq_sync_log_level >= VCHIQ_LOG_TRACE) {
int svc_fourcc;
svc_fourcc = service
? service->base.fourcc
: VCHIQ_MAKE_FOURCC('?', '?', '?', '?');
vchiq_log_trace(vchiq_sync_log_level,
"Sent Sync Msg %s(%u) to %c%c%c%c s:%u d:%d len:%d",
msg_type_str(VCHIQ_MSG_TYPE(msgid)),
VCHIQ_MSG_TYPE(msgid),
VCHIQ_FOURCC_AS_4CHARS(svc_fourcc),
VCHIQ_MSG_SRCPORT(msgid),
VCHIQ_MSG_DSTPORT(msgid),
size);
}
remote_event_signal(&state->remote->sync_trigger);
if (VCHIQ_MSG_TYPE(msgid) != VCHIQ_MSG_PAUSE)
mutex_unlock(&state->sync_mutex);
return VCHIQ_SUCCESS;
}
static inline void
claim_slot(struct vchiq_slot_info *slot)
{
slot->use_count++;
}
static void
release_slot(struct vchiq_state *state, struct vchiq_slot_info *slot_info,
struct vchiq_header *header, struct vchiq_service *service)
{
int release_count;
mutex_lock(&state->recycle_mutex);
if (header) {
int msgid = header->msgid;
if (((msgid & VCHIQ_MSGID_CLAIMED) == 0) ||
(service && service->closing)) {
mutex_unlock(&state->recycle_mutex);
return;
}
/* Rewrite the message header to prevent a double
** release */
header->msgid = msgid & ~VCHIQ_MSGID_CLAIMED;
}
release_count = slot_info->release_count;
slot_info->release_count = ++release_count;
if (release_count == slot_info->use_count) {
int slot_queue_recycle;
/* Add to the freed queue */
/* A read barrier is necessary here to prevent speculative
** fetches of remote->slot_queue_recycle from overtaking the
** mutex. */
rmb();
slot_queue_recycle = state->remote->slot_queue_recycle;
state->remote->slot_queue[slot_queue_recycle &
VCHIQ_SLOT_QUEUE_MASK] =
SLOT_INDEX_FROM_INFO(state, slot_info);
state->remote->slot_queue_recycle = slot_queue_recycle + 1;
vchiq_log_info(vchiq_core_log_level,
"%d: %s %d - recycle->%x", state->id, __func__,
SLOT_INDEX_FROM_INFO(state, slot_info),
state->remote->slot_queue_recycle);
/* A write barrier is necessary, but remote_event_signal
** contains one. */
remote_event_signal(&state->remote->recycle);
}
mutex_unlock(&state->recycle_mutex);
}
/* Called by the slot handler - don't hold the bulk mutex */
static enum vchiq_status
notify_bulks(struct vchiq_service *service, struct vchiq_bulk_queue *queue,
int retry_poll)
{
enum vchiq_status status = VCHIQ_SUCCESS;
vchiq_log_trace(vchiq_core_log_level,
"%d: nb:%d %cx - p=%x rn=%x r=%x",
service->state->id, service->localport,
(queue == &service->bulk_tx) ? 't' : 'r',
queue->process, queue->remote_notify, queue->remove);
queue->remote_notify = queue->process;
if (status == VCHIQ_SUCCESS) {
while (queue->remove != queue->remote_notify) {
struct vchiq_bulk *bulk =
&queue->bulks[BULK_INDEX(queue->remove)];
/* Only generate callbacks for non-dummy bulk
** requests, and non-terminated services */
if (bulk->data && service->instance) {
if (bulk->actual != VCHIQ_BULK_ACTUAL_ABORTED) {
if (bulk->dir == VCHIQ_BULK_TRANSMIT) {
VCHIQ_SERVICE_STATS_INC(service,
bulk_tx_count);
VCHIQ_SERVICE_STATS_ADD(service,
bulk_tx_bytes,
bulk->actual);
} else {
VCHIQ_SERVICE_STATS_INC(service,
bulk_rx_count);
VCHIQ_SERVICE_STATS_ADD(service,
bulk_rx_bytes,
bulk->actual);
}
} else {
VCHIQ_SERVICE_STATS_INC(service,
bulk_aborted_count);
}
if (bulk->mode == VCHIQ_BULK_MODE_BLOCKING) {
struct bulk_waiter *waiter;
spin_lock(&bulk_waiter_spinlock);
waiter = bulk->userdata;
if (waiter) {
waiter->actual = bulk->actual;
complete(&waiter->event);
}
spin_unlock(&bulk_waiter_spinlock);
} else if (bulk->mode ==
VCHIQ_BULK_MODE_CALLBACK) {
enum vchiq_reason reason = (bulk->dir ==
VCHIQ_BULK_TRANSMIT) ?
((bulk->actual ==
VCHIQ_BULK_ACTUAL_ABORTED) ?
VCHIQ_BULK_TRANSMIT_ABORTED :
VCHIQ_BULK_TRANSMIT_DONE) :
((bulk->actual ==
VCHIQ_BULK_ACTUAL_ABORTED) ?
VCHIQ_BULK_RECEIVE_ABORTED :
VCHIQ_BULK_RECEIVE_DONE);
status = make_service_callback(service,
reason, NULL, bulk->userdata);
if (status == VCHIQ_RETRY)
break;
}
}
queue->remove++;
complete(&service->bulk_remove_event);
}
if (!retry_poll)
status = VCHIQ_SUCCESS;
}
if (status == VCHIQ_RETRY)
request_poll(service->state, service,
(queue == &service->bulk_tx) ?
VCHIQ_POLL_TXNOTIFY : VCHIQ_POLL_RXNOTIFY);
return status;
}
/* Called by the slot handler thread */
static void
poll_services(struct vchiq_state *state)
{
int group, i;
for (group = 0; group < BITSET_SIZE(state->unused_service); group++) {
u32 flags;
flags = atomic_xchg(&state->poll_services[group], 0);
for (i = 0; flags; i++) {
if (flags & (1 << i)) {
struct vchiq_service *service =
find_service_by_port(state,
(group<<5) + i);
u32 service_flags;
flags &= ~(1 << i);
if (!service)
continue;
service_flags =
atomic_xchg(&service->poll_flags, 0);
if (service_flags &
(1 << VCHIQ_POLL_REMOVE)) {
vchiq_log_info(vchiq_core_log_level,
"%d: ps - remove %d<->%d",
state->id, service->localport,
service->remoteport);
/* Make it look like a client, because
it must be removed and not left in
the LISTENING state. */
service->public_fourcc =
VCHIQ_FOURCC_INVALID;
if (vchiq_close_service_internal(
service, 0/*!close_recvd*/) !=
VCHIQ_SUCCESS)
request_poll(state, service,
VCHIQ_POLL_REMOVE);
} else if (service_flags &
(1 << VCHIQ_POLL_TERMINATE)) {
vchiq_log_info(vchiq_core_log_level,
"%d: ps - terminate %d<->%d",
state->id, service->localport,
service->remoteport);
if (vchiq_close_service_internal(
service, 0/*!close_recvd*/) !=
VCHIQ_SUCCESS)
request_poll(state, service,
VCHIQ_POLL_TERMINATE);
}
if (service_flags & (1 << VCHIQ_POLL_TXNOTIFY))
notify_bulks(service,
&service->bulk_tx,
1/*retry_poll*/);
if (service_flags & (1 << VCHIQ_POLL_RXNOTIFY))
notify_bulks(service,
&service->bulk_rx,
1/*retry_poll*/);
unlock_service(service);
}
}
}
}
/* Called with the bulk_mutex held */
static void
abort_outstanding_bulks(struct vchiq_service *service,
struct vchiq_bulk_queue *queue)
{
int is_tx = (queue == &service->bulk_tx);
vchiq_log_trace(vchiq_core_log_level,
"%d: aob:%d %cx - li=%x ri=%x p=%x",
service->state->id, service->localport, is_tx ? 't' : 'r',
queue->local_insert, queue->remote_insert, queue->process);
WARN_ON(!((int)(queue->local_insert - queue->process) >= 0));
WARN_ON(!((int)(queue->remote_insert - queue->process) >= 0));
while ((queue->process != queue->local_insert) ||
(queue->process != queue->remote_insert)) {
struct vchiq_bulk *bulk =
&queue->bulks[BULK_INDEX(queue->process)];
if (queue->process == queue->remote_insert) {
/* fabricate a matching dummy bulk */
bulk->remote_data = NULL;
bulk->remote_size = 0;
queue->remote_insert++;
}
if (queue->process != queue->local_insert) {
vchiq_complete_bulk(bulk);
vchiq_log_info(SRVTRACE_LEVEL(service),
"%s %c%c%c%c d:%d ABORTED - tx len:%d, "
"rx len:%d",
is_tx ? "Send Bulk to" : "Recv Bulk from",
VCHIQ_FOURCC_AS_4CHARS(service->base.fourcc),
service->remoteport,
bulk->size,
bulk->remote_size);
} else {
/* fabricate a matching dummy bulk */
bulk->data = NULL;
bulk->size = 0;
bulk->actual = VCHIQ_BULK_ACTUAL_ABORTED;
bulk->dir = is_tx ? VCHIQ_BULK_TRANSMIT :
VCHIQ_BULK_RECEIVE;
queue->local_insert++;
}
queue->process++;
}
}
static int
parse_open(struct vchiq_state *state, struct vchiq_header *header)
{
struct vchiq_service *service = NULL;
int msgid, size;
unsigned int localport, remoteport;
msgid = header->msgid;
size = header->size;
localport = VCHIQ_MSG_DSTPORT(msgid);
remoteport = VCHIQ_MSG_SRCPORT(msgid);
if (size >= sizeof(struct vchiq_open_payload)) {
const struct vchiq_open_payload *payload =
(struct vchiq_open_payload *)header->data;
unsigned int fourcc;
fourcc = payload->fourcc;
vchiq_log_info(vchiq_core_log_level,
"%d: prs OPEN@%pK (%d->'%c%c%c%c')",
state->id, header, localport,
VCHIQ_FOURCC_AS_4CHARS(fourcc));
service = get_listening_service(state, fourcc);
if (service) {
/* A matching service exists */
short version = payload->version;
short version_min = payload->version_min;
if ((service->version < version_min) ||
(version < service->version_min)) {
/* Version mismatch */
vchiq_loud_error_header();
vchiq_loud_error("%d: service %d (%c%c%c%c) "
"version mismatch - local (%d, min %d)"
" vs. remote (%d, min %d)",
state->id, service->localport,
VCHIQ_FOURCC_AS_4CHARS(fourcc),
service->version, service->version_min,
version, version_min);
vchiq_loud_error_footer();
unlock_service(service);
service = NULL;
goto fail_open;
}
service->peer_version = version;
if (service->srvstate == VCHIQ_SRVSTATE_LISTENING) {
struct vchiq_openack_payload ack_payload = {
service->version
};
if (state->version_common <
VCHIQ_VERSION_SYNCHRONOUS_MODE)
service->sync = 0;
/* Acknowledge the OPEN */
if (service->sync) {
if (queue_message_sync(
state,
NULL,
VCHIQ_MAKE_MSG(
VCHIQ_MSG_OPENACK,
service->localport,
remoteport),
memcpy_copy_callback,
&ack_payload,
sizeof(ack_payload),
0) == VCHIQ_RETRY)
goto bail_not_ready;
} else {
if (queue_message(state,
NULL,
VCHIQ_MAKE_MSG(
VCHIQ_MSG_OPENACK,
service->localport,
remoteport),
memcpy_copy_callback,
&ack_payload,
sizeof(ack_payload),
0) == VCHIQ_RETRY)
goto bail_not_ready;
}
/* The service is now open */
vchiq_set_service_state(service,
service->sync ? VCHIQ_SRVSTATE_OPENSYNC
: VCHIQ_SRVSTATE_OPEN);
}
service->remoteport = remoteport;
service->client_id = ((int *)header->data)[1];
if (make_service_callback(service, VCHIQ_SERVICE_OPENED,
NULL, NULL) == VCHIQ_RETRY) {
/* Bail out if not ready */
service->remoteport = VCHIQ_PORT_FREE;
goto bail_not_ready;
}
/* Success - the message has been dealt with */
unlock_service(service);
return 1;
}
}
fail_open:
/* No available service, or an invalid request - send a CLOSE */
if (queue_message(state, NULL,
VCHIQ_MAKE_MSG(VCHIQ_MSG_CLOSE, 0, VCHIQ_MSG_SRCPORT(msgid)),
NULL, NULL, 0, 0) == VCHIQ_RETRY)
goto bail_not_ready;
return 1;
bail_not_ready:
if (service)
unlock_service(service);
return 0;
}
/* Called by the slot handler thread */
static void
parse_rx_slots(struct vchiq_state *state)
{
struct vchiq_shared_state *remote = state->remote;
struct vchiq_service *service = NULL;
int tx_pos;
DEBUG_INITIALISE(state->local)
tx_pos = remote->tx_pos;
while (state->rx_pos != tx_pos) {
struct vchiq_header *header;
int msgid, size;
int type;
unsigned int localport, remoteport;
DEBUG_TRACE(PARSE_LINE);
if (!state->rx_data) {
int rx_index;
WARN_ON(!((state->rx_pos & VCHIQ_SLOT_MASK) == 0));
rx_index = remote->slot_queue[
SLOT_QUEUE_INDEX_FROM_POS(state->rx_pos) &
VCHIQ_SLOT_QUEUE_MASK];
state->rx_data = (char *)SLOT_DATA_FROM_INDEX(state,
rx_index);
state->rx_info = SLOT_INFO_FROM_INDEX(state, rx_index);
/* Initialise use_count to one, and increment
** release_count at the end of the slot to avoid
** releasing the slot prematurely. */
state->rx_info->use_count = 1;
state->rx_info->release_count = 0;
}
header = (struct vchiq_header *)(state->rx_data +
(state->rx_pos & VCHIQ_SLOT_MASK));
DEBUG_VALUE(PARSE_HEADER, (int)(long)header);
msgid = header->msgid;
DEBUG_VALUE(PARSE_MSGID, msgid);
size = header->size;
type = VCHIQ_MSG_TYPE(msgid);
localport = VCHIQ_MSG_DSTPORT(msgid);
remoteport = VCHIQ_MSG_SRCPORT(msgid);
if (type != VCHIQ_MSG_DATA)
VCHIQ_STATS_INC(state, ctrl_rx_count);
switch (type) {
case VCHIQ_MSG_OPENACK:
case VCHIQ_MSG_CLOSE:
case VCHIQ_MSG_DATA:
case VCHIQ_MSG_BULK_RX:
case VCHIQ_MSG_BULK_TX:
case VCHIQ_MSG_BULK_RX_DONE:
case VCHIQ_MSG_BULK_TX_DONE:
service = find_service_by_port(state, localport);
if ((!service ||
((service->remoteport != remoteport) &&
(service->remoteport != VCHIQ_PORT_FREE))) &&
(localport == 0) &&
(type == VCHIQ_MSG_CLOSE)) {
/* This could be a CLOSE from a client which
hadn't yet received the OPENACK - look for
the connected service */
if (service)
unlock_service(service);
service = get_connected_service(state,
remoteport);
if (service)
vchiq_log_warning(vchiq_core_log_level,
"%d: prs %s@%pK (%d->%d) - found connected service %d",
state->id, msg_type_str(type),
header, remoteport, localport,
service->localport);
}
if (!service) {
vchiq_log_error(vchiq_core_log_level,
"%d: prs %s@%pK (%d->%d) - invalid/closed service %d",
state->id, msg_type_str(type),
header, remoteport, localport,
localport);
goto skip_message;
}
break;
default:
break;
}
if (SRVTRACE_ENABLED(service, VCHIQ_LOG_INFO)) {
int svc_fourcc;
svc_fourcc = service
? service->base.fourcc
: VCHIQ_MAKE_FOURCC('?', '?', '?', '?');
vchiq_log_info(SRVTRACE_LEVEL(service),
"Rcvd Msg %s(%u) from %c%c%c%c s:%d d:%d "
"len:%d",
msg_type_str(type), type,
VCHIQ_FOURCC_AS_4CHARS(svc_fourcc),
remoteport, localport, size);
if (size > 0)
vchiq_log_dump_mem("Rcvd", 0, header->data,
min(16, size));
}
if (((unsigned long)header & VCHIQ_SLOT_MASK) +
calc_stride(size) > VCHIQ_SLOT_SIZE) {
vchiq_log_error(vchiq_core_log_level,
"header %pK (msgid %x) - size %x too big for slot",
header, (unsigned int)msgid,
(unsigned int)size);
WARN(1, "oversized for slot\n");
}
switch (type) {
case VCHIQ_MSG_OPEN:
WARN_ON(!(VCHIQ_MSG_DSTPORT(msgid) == 0));
if (!parse_open(state, header))
goto bail_not_ready;
break;
case VCHIQ_MSG_OPENACK:
if (size >= sizeof(struct vchiq_openack_payload)) {
const struct vchiq_openack_payload *payload =
(struct vchiq_openack_payload *)
header->data;
service->peer_version = payload->version;
}
vchiq_log_info(vchiq_core_log_level,
"%d: prs OPENACK@%pK,%x (%d->%d) v:%d",
state->id, header, size, remoteport, localport,
service->peer_version);
if (service->srvstate ==
VCHIQ_SRVSTATE_OPENING) {
service->remoteport = remoteport;
vchiq_set_service_state(service,
VCHIQ_SRVSTATE_OPEN);
complete(&service->remove_event);
} else
vchiq_log_error(vchiq_core_log_level,
"OPENACK received in state %s",
srvstate_names[service->srvstate]);
break;
case VCHIQ_MSG_CLOSE:
WARN_ON(size != 0); /* There should be no data */
vchiq_log_info(vchiq_core_log_level,
"%d: prs CLOSE@%pK (%d->%d)",
state->id, header, remoteport, localport);
mark_service_closing_internal(service, 1);
if (vchiq_close_service_internal(service,
1/*close_recvd*/) == VCHIQ_RETRY)
goto bail_not_ready;
vchiq_log_info(vchiq_core_log_level,
"Close Service %c%c%c%c s:%u d:%d",
VCHIQ_FOURCC_AS_4CHARS(service->base.fourcc),
service->localport,
service->remoteport);
break;
case VCHIQ_MSG_DATA:
vchiq_log_info(vchiq_core_log_level,
"%d: prs DATA@%pK,%x (%d->%d)",
state->id, header, size, remoteport, localport);
if ((service->remoteport == remoteport)
&& (service->srvstate ==
VCHIQ_SRVSTATE_OPEN)) {
header->msgid = msgid | VCHIQ_MSGID_CLAIMED;
claim_slot(state->rx_info);
DEBUG_TRACE(PARSE_LINE);
if (make_service_callback(service,
VCHIQ_MESSAGE_AVAILABLE, header,
NULL) == VCHIQ_RETRY) {
DEBUG_TRACE(PARSE_LINE);
goto bail_not_ready;
}
VCHIQ_SERVICE_STATS_INC(service, ctrl_rx_count);
VCHIQ_SERVICE_STATS_ADD(service, ctrl_rx_bytes,
size);
} else {
VCHIQ_STATS_INC(state, error_count);
}
break;
case VCHIQ_MSG_CONNECT:
vchiq_log_info(vchiq_core_log_level,
"%d: prs CONNECT@%pK", state->id, header);
state->version_common = ((struct vchiq_slot_zero *)
state->slot_data)->version;
complete(&state->connect);
break;
case VCHIQ_MSG_BULK_RX:
case VCHIQ_MSG_BULK_TX:
/*
* We should never receive a bulk request from the
* other side since we're not setup to perform as the
* master.
*/
WARN_ON(1);
break;
case VCHIQ_MSG_BULK_RX_DONE:
case VCHIQ_MSG_BULK_TX_DONE:
if ((service->remoteport == remoteport)
&& (service->srvstate !=
VCHIQ_SRVSTATE_FREE)) {
struct vchiq_bulk_queue *queue;
struct vchiq_bulk *bulk;
queue = (type == VCHIQ_MSG_BULK_RX_DONE) ?
&service->bulk_rx : &service->bulk_tx;
DEBUG_TRACE(PARSE_LINE);
if (mutex_lock_killable(&service->bulk_mutex)) {
DEBUG_TRACE(PARSE_LINE);
goto bail_not_ready;
}
if ((int)(queue->remote_insert -
queue->local_insert) >= 0) {
vchiq_log_error(vchiq_core_log_level,
"%d: prs %s@%pK (%d->%d) "
"unexpected (ri=%d,li=%d)",
state->id, msg_type_str(type),
header, remoteport, localport,
queue->remote_insert,
queue->local_insert);
mutex_unlock(&service->bulk_mutex);
break;
}
if (queue->process != queue->remote_insert) {
pr_err("%s: p %x != ri %x\n",
__func__,
queue->process,
queue->remote_insert);
mutex_unlock(&service->bulk_mutex);
goto bail_not_ready;
}
bulk = &queue->bulks[
BULK_INDEX(queue->remote_insert)];
bulk->actual = *(int *)header->data;
queue->remote_insert++;
vchiq_log_info(vchiq_core_log_level,
"%d: prs %s@%pK (%d->%d) %x@%pK",
state->id, msg_type_str(type),
header, remoteport, localport,
bulk->actual, bulk->data);
vchiq_log_trace(vchiq_core_log_level,
"%d: prs:%d %cx li=%x ri=%x p=%x",
state->id, localport,
(type == VCHIQ_MSG_BULK_RX_DONE) ?
'r' : 't',
queue->local_insert,
queue->remote_insert, queue->process);
DEBUG_TRACE(PARSE_LINE);
WARN_ON(queue->process == queue->local_insert);
vchiq_complete_bulk(bulk);
queue->process++;
mutex_unlock(&service->bulk_mutex);
DEBUG_TRACE(PARSE_LINE);
notify_bulks(service, queue, 1/*retry_poll*/);
DEBUG_TRACE(PARSE_LINE);
}
break;
case VCHIQ_MSG_PADDING:
vchiq_log_trace(vchiq_core_log_level,
"%d: prs PADDING@%pK,%x",
state->id, header, size);
break;
case VCHIQ_MSG_PAUSE:
/* If initiated, signal the application thread */
vchiq_log_trace(vchiq_core_log_level,
"%d: prs PAUSE@%pK,%x",
state->id, header, size);
if (state->conn_state == VCHIQ_CONNSTATE_PAUSED) {
vchiq_log_error(vchiq_core_log_level,
"%d: PAUSE received in state PAUSED",
state->id);
break;
}
if (state->conn_state != VCHIQ_CONNSTATE_PAUSE_SENT) {
/* Send a PAUSE in response */
if (queue_message(state, NULL,
VCHIQ_MAKE_MSG(VCHIQ_MSG_PAUSE, 0, 0),
NULL, NULL, 0, QMFLAGS_NO_MUTEX_UNLOCK)
== VCHIQ_RETRY)
goto bail_not_ready;
}
/* At this point slot_mutex is held */
vchiq_set_conn_state(state, VCHIQ_CONNSTATE_PAUSED);
break;
case VCHIQ_MSG_RESUME:
vchiq_log_trace(vchiq_core_log_level,
"%d: prs RESUME@%pK,%x",
state->id, header, size);
/* Release the slot mutex */
mutex_unlock(&state->slot_mutex);
vchiq_set_conn_state(state, VCHIQ_CONNSTATE_CONNECTED);
break;
case VCHIQ_MSG_REMOTE_USE:
vchiq_on_remote_use(state);
break;
case VCHIQ_MSG_REMOTE_RELEASE:
vchiq_on_remote_release(state);
break;
case VCHIQ_MSG_REMOTE_USE_ACTIVE:
break;
default:
vchiq_log_error(vchiq_core_log_level,
"%d: prs invalid msgid %x@%pK,%x",
state->id, msgid, header, size);
WARN(1, "invalid message\n");
break;
}
skip_message:
if (service) {
unlock_service(service);
service = NULL;
}
state->rx_pos += calc_stride(size);
DEBUG_TRACE(PARSE_LINE);
/* Perform some housekeeping when the end of the slot is
** reached. */
if ((state->rx_pos & VCHIQ_SLOT_MASK) == 0) {
/* Remove the extra reference count. */
release_slot(state, state->rx_info, NULL, NULL);
state->rx_data = NULL;
}
}
bail_not_ready:
if (service)
unlock_service(service);
}
/* Called by the slot handler thread */
static int
slot_handler_func(void *v)
{
struct vchiq_state *state = v;
struct vchiq_shared_state *local = state->local;
DEBUG_INITIALISE(local)
while (1) {
DEBUG_COUNT(SLOT_HANDLER_COUNT);
DEBUG_TRACE(SLOT_HANDLER_LINE);
remote_event_wait(&state->trigger_event, &local->trigger);
rmb();
DEBUG_TRACE(SLOT_HANDLER_LINE);
if (state->poll_needed) {
state->poll_needed = 0;
/* Handle service polling and other rare conditions here
** out of the mainline code */
switch (state->conn_state) {
case VCHIQ_CONNSTATE_CONNECTED:
/* Poll the services as requested */
poll_services(state);
break;
case VCHIQ_CONNSTATE_PAUSING:
if (queue_message(state, NULL,
VCHIQ_MAKE_MSG(VCHIQ_MSG_PAUSE, 0, 0),
NULL, NULL, 0,
QMFLAGS_NO_MUTEX_UNLOCK)
!= VCHIQ_RETRY) {
vchiq_set_conn_state(state,
VCHIQ_CONNSTATE_PAUSE_SENT);
} else {
/* Retry later */
state->poll_needed = 1;
}
break;
case VCHIQ_CONNSTATE_RESUMING:
if (queue_message(state, NULL,
VCHIQ_MAKE_MSG(VCHIQ_MSG_RESUME, 0, 0),
NULL, NULL, 0, QMFLAGS_NO_MUTEX_LOCK)
!= VCHIQ_RETRY) {
vchiq_set_conn_state(state,
VCHIQ_CONNSTATE_CONNECTED);
} else {
/* This should really be impossible,
** since the PAUSE should have flushed
** through outstanding messages. */
vchiq_log_error(vchiq_core_log_level,
"Failed to send RESUME "
"message");
}
break;
default:
break;
}
}
DEBUG_TRACE(SLOT_HANDLER_LINE);
parse_rx_slots(state);
}
return 0;
}
/* Called by the recycle thread */
static int
recycle_func(void *v)
{
struct vchiq_state *state = v;
struct vchiq_shared_state *local = state->local;
BITSET_T *found;
size_t length;
length = sizeof(*found) * BITSET_SIZE(VCHIQ_MAX_SERVICES);
found = kmalloc_array(BITSET_SIZE(VCHIQ_MAX_SERVICES), sizeof(*found),
GFP_KERNEL);
if (!found)
return -ENOMEM;
while (1) {
remote_event_wait(&state->recycle_event, &local->recycle);
process_free_queue(state, found, length);
}
return 0;
}
/* Called by the sync thread */
static int
sync_func(void *v)
{
struct vchiq_state *state = v;
struct vchiq_shared_state *local = state->local;
struct vchiq_header *header =
(struct vchiq_header *)SLOT_DATA_FROM_INDEX(state,
state->remote->slot_sync);
while (1) {
struct vchiq_service *service;
int msgid, size;
int type;
unsigned int localport, remoteport;
remote_event_wait(&state->sync_trigger_event, &local->sync_trigger);
rmb();
msgid = header->msgid;
size = header->size;
type = VCHIQ_MSG_TYPE(msgid);
localport = VCHIQ_MSG_DSTPORT(msgid);
remoteport = VCHIQ_MSG_SRCPORT(msgid);
service = find_service_by_port(state, localport);
if (!service) {
vchiq_log_error(vchiq_sync_log_level,
"%d: sf %s@%pK (%d->%d) - invalid/closed service %d",
state->id, msg_type_str(type),
header, remoteport, localport, localport);
release_message_sync(state, header);
continue;
}
if (vchiq_sync_log_level >= VCHIQ_LOG_TRACE) {
int svc_fourcc;
svc_fourcc = service
? service->base.fourcc
: VCHIQ_MAKE_FOURCC('?', '?', '?', '?');
vchiq_log_trace(vchiq_sync_log_level,
"Rcvd Msg %s from %c%c%c%c s:%d d:%d len:%d",
msg_type_str(type),
VCHIQ_FOURCC_AS_4CHARS(svc_fourcc),
remoteport, localport, size);
if (size > 0)
vchiq_log_dump_mem("Rcvd", 0, header->data,
min(16, size));
}
switch (type) {
case VCHIQ_MSG_OPENACK:
if (size >= sizeof(struct vchiq_openack_payload)) {
const struct vchiq_openack_payload *payload =
(struct vchiq_openack_payload *)
header->data;
service->peer_version = payload->version;
}
vchiq_log_info(vchiq_sync_log_level,
"%d: sf OPENACK@%pK,%x (%d->%d) v:%d",
state->id, header, size, remoteport, localport,
service->peer_version);
if (service->srvstate == VCHIQ_SRVSTATE_OPENING) {
service->remoteport = remoteport;
vchiq_set_service_state(service,
VCHIQ_SRVSTATE_OPENSYNC);
service->sync = 1;
complete(&service->remove_event);
}
release_message_sync(state, header);
break;
case VCHIQ_MSG_DATA:
vchiq_log_trace(vchiq_sync_log_level,
"%d: sf DATA@%pK,%x (%d->%d)",
state->id, header, size, remoteport, localport);
if ((service->remoteport == remoteport) &&
(service->srvstate ==
VCHIQ_SRVSTATE_OPENSYNC)) {
if (make_service_callback(service,
VCHIQ_MESSAGE_AVAILABLE, header,
NULL) == VCHIQ_RETRY)
vchiq_log_error(vchiq_sync_log_level,
"synchronous callback to "
"service %d returns "
"VCHIQ_RETRY",
localport);
}
break;
default:
vchiq_log_error(vchiq_sync_log_level,
"%d: sf unexpected msgid %x@%pK,%x",
state->id, msgid, header, size);
release_message_sync(state, header);
break;
}
unlock_service(service);
}
return 0;
}
static void
init_bulk_queue(struct vchiq_bulk_queue *queue)
{
queue->local_insert = 0;
queue->remote_insert = 0;
queue->process = 0;
queue->remote_notify = 0;
queue->remove = 0;
}
inline const char *
get_conn_state_name(enum vchiq_connstate conn_state)
{
return conn_state_names[conn_state];
}
struct vchiq_slot_zero *
vchiq_init_slots(void *mem_base, int mem_size)
{
int mem_align =
(int)((VCHIQ_SLOT_SIZE - (long)mem_base) & VCHIQ_SLOT_MASK);
struct vchiq_slot_zero *slot_zero =
(struct vchiq_slot_zero *)(mem_base + mem_align);
int num_slots = (mem_size - mem_align)/VCHIQ_SLOT_SIZE;
int first_data_slot = VCHIQ_SLOT_ZERO_SLOTS;
/* Ensure there is enough memory to run an absolutely minimum system */
num_slots -= first_data_slot;
if (num_slots < 4) {
vchiq_log_error(vchiq_core_log_level,
"%s - insufficient memory %x bytes",
__func__, mem_size);
return NULL;
}
memset(slot_zero, 0, sizeof(struct vchiq_slot_zero));
slot_zero->magic = VCHIQ_MAGIC;
slot_zero->version = VCHIQ_VERSION;
slot_zero->version_min = VCHIQ_VERSION_MIN;
slot_zero->slot_zero_size = sizeof(struct vchiq_slot_zero);
slot_zero->slot_size = VCHIQ_SLOT_SIZE;
slot_zero->max_slots = VCHIQ_MAX_SLOTS;
slot_zero->max_slots_per_side = VCHIQ_MAX_SLOTS_PER_SIDE;
slot_zero->master.slot_sync = first_data_slot;
slot_zero->master.slot_first = first_data_slot + 1;
slot_zero->master.slot_last = first_data_slot + (num_slots/2) - 1;
slot_zero->slave.slot_sync = first_data_slot + (num_slots/2);
slot_zero->slave.slot_first = first_data_slot + (num_slots/2) + 1;
slot_zero->slave.slot_last = first_data_slot + num_slots - 1;
return slot_zero;
}
enum vchiq_status
vchiq_init_state(struct vchiq_state *state, struct vchiq_slot_zero *slot_zero)
{
struct vchiq_shared_state *local;
struct vchiq_shared_state *remote;
enum vchiq_status status;
char threadname[16];
int i;
if (vchiq_states[0]) {
pr_err("%s: VCHIQ state already initialized\n", __func__);
return VCHIQ_ERROR;
}
local = &slot_zero->slave;
remote = &slot_zero->master;
if (local->initialised) {
vchiq_loud_error_header();
if (remote->initialised)
vchiq_loud_error("local state has already been "
"initialised");
else
vchiq_loud_error("master/slave mismatch two slaves");
vchiq_loud_error_footer();
return VCHIQ_ERROR;
}
memset(state, 0, sizeof(struct vchiq_state));
/*
initialize shared state pointers
*/
state->local = local;
state->remote = remote;
state->slot_data = (struct vchiq_slot *)slot_zero;
/*
initialize events and mutexes
*/
init_completion(&state->connect);
mutex_init(&state->mutex);
mutex_init(&state->slot_mutex);
mutex_init(&state->recycle_mutex);
mutex_init(&state->sync_mutex);
mutex_init(&state->bulk_transfer_mutex);
init_completion(&state->slot_available_event);
init_completion(&state->slot_remove_event);
init_completion(&state->data_quota_event);
state->slot_queue_available = 0;
for (i = 0; i < VCHIQ_MAX_SERVICES; i++) {
struct vchiq_service_quota *service_quota =
&state->service_quotas[i];
init_completion(&service_quota->quota_event);
}
for (i = local->slot_first; i <= local->slot_last; i++) {
local->slot_queue[state->slot_queue_available++] = i;
complete(&state->slot_available_event);
}
state->default_slot_quota = state->slot_queue_available/2;
state->default_message_quota =
min((unsigned short)(state->default_slot_quota * 256),
(unsigned short)~0);
state->previous_data_index = -1;
state->data_use_count = 0;
state->data_quota = state->slot_queue_available - 1;
remote_event_create(&state->trigger_event, &local->trigger);
local->tx_pos = 0;
remote_event_create(&state->recycle_event, &local->recycle);
local->slot_queue_recycle = state->slot_queue_available;
remote_event_create(&state->sync_trigger_event, &local->sync_trigger);
remote_event_create(&state->sync_release_event, &local->sync_release);
/* At start-of-day, the slot is empty and available */
((struct vchiq_header *)
SLOT_DATA_FROM_INDEX(state, local->slot_sync))->msgid =
VCHIQ_MSGID_PADDING;
remote_event_signal_local(&state->sync_release_event, &local->sync_release);
local->debug[DEBUG_ENTRIES] = DEBUG_MAX;
status = vchiq_platform_init_state(state);
if (status != VCHIQ_SUCCESS)
return VCHIQ_ERROR;
/*
bring up slot handler thread
*/
snprintf(threadname, sizeof(threadname), "vchiq-slot/%d", state->id);
state->slot_handler_thread = kthread_create(&slot_handler_func,
(void *)state,
threadname);
if (IS_ERR(state->slot_handler_thread)) {
vchiq_loud_error_header();
vchiq_loud_error("couldn't create thread %s", threadname);
vchiq_loud_error_footer();
return VCHIQ_ERROR;
}
set_user_nice(state->slot_handler_thread, -19);
snprintf(threadname, sizeof(threadname), "vchiq-recy/%d", state->id);
state->recycle_thread = kthread_create(&recycle_func,
(void *)state,
threadname);
if (IS_ERR(state->recycle_thread)) {
vchiq_loud_error_header();
vchiq_loud_error("couldn't create thread %s", threadname);
vchiq_loud_error_footer();
goto fail_free_handler_thread;
}
set_user_nice(state->recycle_thread, -19);
snprintf(threadname, sizeof(threadname), "vchiq-sync/%d", state->id);
state->sync_thread = kthread_create(&sync_func,
(void *)state,
threadname);
if (IS_ERR(state->sync_thread)) {
vchiq_loud_error_header();
vchiq_loud_error("couldn't create thread %s", threadname);
vchiq_loud_error_footer();
goto fail_free_recycle_thread;
}
set_user_nice(state->sync_thread, -20);
wake_up_process(state->slot_handler_thread);
wake_up_process(state->recycle_thread);
wake_up_process(state->sync_thread);
vchiq_states[0] = state;
/* Indicate readiness to the other side */
local->initialised = 1;
return status;
fail_free_recycle_thread:
kthread_stop(state->recycle_thread);
fail_free_handler_thread:
kthread_stop(state->slot_handler_thread);
return VCHIQ_ERROR;
}
/* Called from application thread when a client or server service is created. */
struct vchiq_service *
vchiq_add_service_internal(struct vchiq_state *state,
const struct vchiq_service_params *params,
int srvstate, struct vchiq_instance *instance,
vchiq_userdata_term userdata_term)
{
struct vchiq_service *service;
struct vchiq_service **pservice = NULL;
struct vchiq_service_quota *service_quota;
int i;
service = kmalloc(sizeof(*service), GFP_KERNEL);
if (!service)
return service;
service->base.fourcc = params->fourcc;
service->base.callback = params->callback;
service->base.userdata = params->userdata;
service->handle = VCHIQ_SERVICE_HANDLE_INVALID;
service->ref_count = 1;
service->srvstate = VCHIQ_SRVSTATE_FREE;
service->userdata_term = userdata_term;
service->localport = VCHIQ_PORT_FREE;
service->remoteport = VCHIQ_PORT_FREE;
service->public_fourcc = (srvstate == VCHIQ_SRVSTATE_OPENING) ?
VCHIQ_FOURCC_INVALID : params->fourcc;
service->client_id = 0;
service->auto_close = 1;
service->sync = 0;
service->closing = 0;
service->trace = 0;
atomic_set(&service->poll_flags, 0);
service->version = params->version;
service->version_min = params->version_min;
service->state = state;
service->instance = instance;
service->service_use_count = 0;
init_bulk_queue(&service->bulk_tx);
init_bulk_queue(&service->bulk_rx);
init_completion(&service->remove_event);
init_completion(&service->bulk_remove_event);
mutex_init(&service->bulk_mutex);
memset(&service->stats, 0, sizeof(service->stats));
/* Although it is perfectly possible to use service_spinlock
** to protect the creation of services, it is overkill as it
** disables interrupts while the array is searched.
** The only danger is of another thread trying to create a
** service - service deletion is safe.
** Therefore it is preferable to use state->mutex which,
** although slower to claim, doesn't block interrupts while
** it is held.
*/
mutex_lock(&state->mutex);
/* Prepare to use a previously unused service */
if (state->unused_service < VCHIQ_MAX_SERVICES)
pservice = &state->services[state->unused_service];
if (srvstate == VCHIQ_SRVSTATE_OPENING) {
for (i = 0; i < state->unused_service; i++) {
struct vchiq_service *srv = state->services[i];
if (!srv) {
pservice = &state->services[i];
break;
}
}
} else {
for (i = (state->unused_service - 1); i >= 0; i--) {
struct vchiq_service *srv = state->services[i];
if (!srv)
pservice = &state->services[i];
else if ((srv->public_fourcc == params->fourcc)
&& ((srv->instance != instance) ||
(srv->base.callback !=
params->callback))) {
/* There is another server using this
** fourcc which doesn't match. */
pservice = NULL;
break;
}
}
}
if (pservice) {
service->localport = (pservice - state->services);
if (!handle_seq)
handle_seq = VCHIQ_MAX_STATES *
VCHIQ_MAX_SERVICES;
service->handle = handle_seq |
(state->id * VCHIQ_MAX_SERVICES) |
service->localport;
handle_seq += VCHIQ_MAX_STATES * VCHIQ_MAX_SERVICES;
*pservice = service;
if (pservice == &state->services[state->unused_service])
state->unused_service++;
}
mutex_unlock(&state->mutex);
if (!pservice) {
kfree(service);
return NULL;
}
service_quota = &state->service_quotas[service->localport];
service_quota->slot_quota = state->default_slot_quota;
service_quota->message_quota = state->default_message_quota;
if (service_quota->slot_use_count == 0)
service_quota->previous_tx_index =
SLOT_QUEUE_INDEX_FROM_POS(state->local_tx_pos)
- 1;
/* Bring this service online */
vchiq_set_service_state(service, srvstate);
vchiq_log_info(vchiq_core_msg_log_level,
"%s Service %c%c%c%c SrcPort:%d",
(srvstate == VCHIQ_SRVSTATE_OPENING)
? "Open" : "Add",
VCHIQ_FOURCC_AS_4CHARS(params->fourcc),
service->localport);
/* Don't unlock the service - leave it with a ref_count of 1. */
return service;
}
enum vchiq_status
vchiq_open_service_internal(struct vchiq_service *service, int client_id)
{
struct vchiq_open_payload payload = {
service->base.fourcc,
client_id,
service->version,
service->version_min
};
enum vchiq_status status = VCHIQ_SUCCESS;
service->client_id = client_id;
vchiq_use_service_internal(service);
status = queue_message(service->state,
NULL,
VCHIQ_MAKE_MSG(VCHIQ_MSG_OPEN,
service->localport,
0),
memcpy_copy_callback,
&payload,
sizeof(payload),
QMFLAGS_IS_BLOCKING);
if (status == VCHIQ_SUCCESS) {
/* Wait for the ACK/NAK */
if (wait_for_completion_interruptible(&service->remove_event)) {
status = VCHIQ_RETRY;
vchiq_release_service_internal(service);
} else if ((service->srvstate != VCHIQ_SRVSTATE_OPEN) &&
(service->srvstate != VCHIQ_SRVSTATE_OPENSYNC)) {
if (service->srvstate != VCHIQ_SRVSTATE_CLOSEWAIT)
vchiq_log_error(vchiq_core_log_level,
"%d: osi - srvstate = %s (ref %d)",
service->state->id,
srvstate_names[service->srvstate],
service->ref_count);
status = VCHIQ_ERROR;
VCHIQ_SERVICE_STATS_INC(service, error_count);
vchiq_release_service_internal(service);
}
}
return status;
}
static void
release_service_messages(struct vchiq_service *service)
{
struct vchiq_state *state = service->state;
int slot_last = state->remote->slot_last;
int i;
/* Release any claimed messages aimed at this service */
if (service->sync) {
struct vchiq_header *header =
(struct vchiq_header *)SLOT_DATA_FROM_INDEX(state,
state->remote->slot_sync);
if (VCHIQ_MSG_DSTPORT(header->msgid) == service->localport)
release_message_sync(state, header);
return;
}
for (i = state->remote->slot_first; i <= slot_last; i++) {
struct vchiq_slot_info *slot_info =
SLOT_INFO_FROM_INDEX(state, i);
if (slot_info->release_count != slot_info->use_count) {
char *data =
(char *)SLOT_DATA_FROM_INDEX(state, i);
unsigned int pos, end;
end = VCHIQ_SLOT_SIZE;
if (data == state->rx_data)
/* This buffer is still being read from - stop
** at the current read position */
end = state->rx_pos & VCHIQ_SLOT_MASK;
pos = 0;
while (pos < end) {
struct vchiq_header *header =
(struct vchiq_header *)(data + pos);
int msgid = header->msgid;
int port = VCHIQ_MSG_DSTPORT(msgid);
if ((port == service->localport) &&
(msgid & VCHIQ_MSGID_CLAIMED)) {
vchiq_log_info(vchiq_core_log_level,
" fsi - hdr %pK", header);
release_slot(state, slot_info, header,
NULL);
}
pos += calc_stride(header->size);
if (pos > VCHIQ_SLOT_SIZE) {
vchiq_log_error(vchiq_core_log_level,
"fsi - pos %x: header %pK, msgid %x, header->msgid %x, header->size %x",
pos, header, msgid,
header->msgid, header->size);
WARN(1, "invalid slot position\n");
}
}
}
}
}
static int
do_abort_bulks(struct vchiq_service *service)
{
enum vchiq_status status;
/* Abort any outstanding bulk transfers */
if (mutex_lock_killable(&service->bulk_mutex))
return 0;
abort_outstanding_bulks(service, &service->bulk_tx);
abort_outstanding_bulks(service, &service->bulk_rx);
mutex_unlock(&service->bulk_mutex);
status = notify_bulks(service, &service->bulk_tx, 0/*!retry_poll*/);
if (status == VCHIQ_SUCCESS)
status = notify_bulks(service, &service->bulk_rx,
0/*!retry_poll*/);
return (status == VCHIQ_SUCCESS);
}
static enum vchiq_status
close_service_complete(struct vchiq_service *service, int failstate)
{
enum vchiq_status status;
int is_server = (service->public_fourcc != VCHIQ_FOURCC_INVALID);
int newstate;
switch (service->srvstate) {
case VCHIQ_SRVSTATE_OPEN:
case VCHIQ_SRVSTATE_CLOSESENT:
case VCHIQ_SRVSTATE_CLOSERECVD:
if (is_server) {
if (service->auto_close) {
service->client_id = 0;
service->remoteport = VCHIQ_PORT_FREE;
newstate = VCHIQ_SRVSTATE_LISTENING;
} else
newstate = VCHIQ_SRVSTATE_CLOSEWAIT;
} else
newstate = VCHIQ_SRVSTATE_CLOSED;
vchiq_set_service_state(service, newstate);
break;
case VCHIQ_SRVSTATE_LISTENING:
break;
default:
vchiq_log_error(vchiq_core_log_level,
"%s(%x) called in state %s", __func__,
service->handle, srvstate_names[service->srvstate]);
WARN(1, "%s in unexpected state\n", __func__);
return VCHIQ_ERROR;
}
status = make_service_callback(service,
VCHIQ_SERVICE_CLOSED, NULL, NULL);
if (status != VCHIQ_RETRY) {
int uc = service->service_use_count;
int i;
/* Complete the close process */
for (i = 0; i < uc; i++)
/* cater for cases where close is forced and the
** client may not close all it's handles */
vchiq_release_service_internal(service);
service->client_id = 0;
service->remoteport = VCHIQ_PORT_FREE;
if (service->srvstate == VCHIQ_SRVSTATE_CLOSED)
vchiq_free_service_internal(service);
else if (service->srvstate != VCHIQ_SRVSTATE_CLOSEWAIT) {
if (is_server)
service->closing = 0;
complete(&service->remove_event);
}
} else
vchiq_set_service_state(service, failstate);
return status;
}
/* Called by the slot handler */
enum vchiq_status
vchiq_close_service_internal(struct vchiq_service *service, int close_recvd)
{
struct vchiq_state *state = service->state;
enum vchiq_status status = VCHIQ_SUCCESS;
int is_server = (service->public_fourcc != VCHIQ_FOURCC_INVALID);
vchiq_log_info(vchiq_core_log_level, "%d: csi:%d,%d (%s)",
service->state->id, service->localport, close_recvd,
srvstate_names[service->srvstate]);
switch (service->srvstate) {
case VCHIQ_SRVSTATE_CLOSED:
case VCHIQ_SRVSTATE_HIDDEN:
case VCHIQ_SRVSTATE_LISTENING:
case VCHIQ_SRVSTATE_CLOSEWAIT:
if (close_recvd)
vchiq_log_error(vchiq_core_log_level,
"%s(1) called "
"in state %s",
__func__, srvstate_names[service->srvstate]);
else if (is_server) {
if (service->srvstate == VCHIQ_SRVSTATE_LISTENING) {
status = VCHIQ_ERROR;
} else {
service->client_id = 0;
service->remoteport = VCHIQ_PORT_FREE;
if (service->srvstate ==
VCHIQ_SRVSTATE_CLOSEWAIT)
vchiq_set_service_state(service,
VCHIQ_SRVSTATE_LISTENING);
}
complete(&service->remove_event);
} else
vchiq_free_service_internal(service);
break;
case VCHIQ_SRVSTATE_OPENING:
if (close_recvd) {
/* The open was rejected - tell the user */
vchiq_set_service_state(service,
VCHIQ_SRVSTATE_CLOSEWAIT);
complete(&service->remove_event);
} else {
/* Shutdown mid-open - let the other side know */
status = queue_message(state, service,
VCHIQ_MAKE_MSG
(VCHIQ_MSG_CLOSE,
service->localport,
VCHIQ_MSG_DSTPORT(service->remoteport)),
NULL, NULL, 0, 0);
}
break;
case VCHIQ_SRVSTATE_OPENSYNC:
mutex_lock(&state->sync_mutex);
/* fall through */
case VCHIQ_SRVSTATE_OPEN:
if (close_recvd) {
if (!do_abort_bulks(service))
status = VCHIQ_RETRY;
}
release_service_messages(service);
if (status == VCHIQ_SUCCESS)
status = queue_message(state, service,
VCHIQ_MAKE_MSG
(VCHIQ_MSG_CLOSE,
service->localport,
VCHIQ_MSG_DSTPORT(service->remoteport)),
NULL, NULL, 0, QMFLAGS_NO_MUTEX_UNLOCK);
if (status == VCHIQ_SUCCESS) {
if (!close_recvd) {
/* Change the state while the mutex is
still held */
vchiq_set_service_state(service,
VCHIQ_SRVSTATE_CLOSESENT);
mutex_unlock(&state->slot_mutex);
if (service->sync)
mutex_unlock(&state->sync_mutex);
break;
}
} else if (service->srvstate == VCHIQ_SRVSTATE_OPENSYNC) {
mutex_unlock(&state->sync_mutex);
break;
} else
break;
/* Change the state while the mutex is still held */
vchiq_set_service_state(service, VCHIQ_SRVSTATE_CLOSERECVD);
mutex_unlock(&state->slot_mutex);
if (service->sync)
mutex_unlock(&state->sync_mutex);
status = close_service_complete(service,
VCHIQ_SRVSTATE_CLOSERECVD);
break;
case VCHIQ_SRVSTATE_CLOSESENT:
if (!close_recvd)
/* This happens when a process is killed mid-close */
break;
if (!do_abort_bulks(service)) {
status = VCHIQ_RETRY;
break;
}
if (status == VCHIQ_SUCCESS)
status = close_service_complete(service,
VCHIQ_SRVSTATE_CLOSERECVD);
break;
case VCHIQ_SRVSTATE_CLOSERECVD:
if (!close_recvd && is_server)
/* Force into LISTENING mode */
vchiq_set_service_state(service,
VCHIQ_SRVSTATE_LISTENING);
status = close_service_complete(service,
VCHIQ_SRVSTATE_CLOSERECVD);
break;
default:
vchiq_log_error(vchiq_core_log_level,
"%s(%d) called in state %s", __func__,
close_recvd, srvstate_names[service->srvstate]);
break;
}
return status;
}
/* Called from the application process upon process death */
void
vchiq_terminate_service_internal(struct vchiq_service *service)
{
struct vchiq_state *state = service->state;
vchiq_log_info(vchiq_core_log_level, "%d: tsi - (%d<->%d)",
state->id, service->localport, service->remoteport);
mark_service_closing(service);
/* Mark the service for removal by the slot handler */
request_poll(state, service, VCHIQ_POLL_REMOVE);
}
/* Called from the slot handler */
void
vchiq_free_service_internal(struct vchiq_service *service)
{
struct vchiq_state *state = service->state;
vchiq_log_info(vchiq_core_log_level, "%d: fsi - (%d)",
state->id, service->localport);
switch (service->srvstate) {
case VCHIQ_SRVSTATE_OPENING:
case VCHIQ_SRVSTATE_CLOSED:
case VCHIQ_SRVSTATE_HIDDEN:
case VCHIQ_SRVSTATE_LISTENING:
case VCHIQ_SRVSTATE_CLOSEWAIT:
break;
default:
vchiq_log_error(vchiq_core_log_level,
"%d: fsi - (%d) in state %s",
state->id, service->localport,
srvstate_names[service->srvstate]);
return;
}
vchiq_set_service_state(service, VCHIQ_SRVSTATE_FREE);
complete(&service->remove_event);
/* Release the initial lock */
unlock_service(service);
}
enum vchiq_status
vchiq_connect_internal(struct vchiq_state *state, struct vchiq_instance *instance)
{
struct vchiq_service *service;
int i;
/* Find all services registered to this client and enable them. */
i = 0;
while ((service = next_service_by_instance(state, instance,
&i)) != NULL) {
if (service->srvstate == VCHIQ_SRVSTATE_HIDDEN)
vchiq_set_service_state(service,
VCHIQ_SRVSTATE_LISTENING);
unlock_service(service);
}
if (state->conn_state == VCHIQ_CONNSTATE_DISCONNECTED) {
if (queue_message(state, NULL,
VCHIQ_MAKE_MSG(VCHIQ_MSG_CONNECT, 0, 0), NULL, NULL,
0, QMFLAGS_IS_BLOCKING) == VCHIQ_RETRY)
return VCHIQ_RETRY;
vchiq_set_conn_state(state, VCHIQ_CONNSTATE_CONNECTING);
}
if (state->conn_state == VCHIQ_CONNSTATE_CONNECTING) {
if (wait_for_completion_interruptible(&state->connect))
return VCHIQ_RETRY;
vchiq_set_conn_state(state, VCHIQ_CONNSTATE_CONNECTED);
complete(&state->connect);
}
return VCHIQ_SUCCESS;
}
enum vchiq_status
vchiq_shutdown_internal(struct vchiq_state *state, struct vchiq_instance *instance)
{
struct vchiq_service *service;
int i;
/* Find all services registered to this client and enable them. */
i = 0;
while ((service = next_service_by_instance(state, instance,
&i)) != NULL) {
(void)vchiq_remove_service(service->handle);
unlock_service(service);
}
return VCHIQ_SUCCESS;
}
enum vchiq_status
vchiq_close_service(unsigned int handle)
{
/* Unregister the service */
struct vchiq_service *service = find_service_by_handle(handle);
enum vchiq_status status = VCHIQ_SUCCESS;
if (!service)
return VCHIQ_ERROR;
vchiq_log_info(vchiq_core_log_level,
"%d: close_service:%d",
service->state->id, service->localport);
if ((service->srvstate == VCHIQ_SRVSTATE_FREE) ||
(service->srvstate == VCHIQ_SRVSTATE_LISTENING) ||
(service->srvstate == VCHIQ_SRVSTATE_HIDDEN)) {
unlock_service(service);
return VCHIQ_ERROR;
}
mark_service_closing(service);
if (current == service->state->slot_handler_thread) {
status = vchiq_close_service_internal(service,
0/*!close_recvd*/);
WARN_ON(status == VCHIQ_RETRY);
} else {
/* Mark the service for termination by the slot handler */
request_poll(service->state, service, VCHIQ_POLL_TERMINATE);
}
while (1) {
if (wait_for_completion_interruptible(&service->remove_event)) {
status = VCHIQ_RETRY;
break;
}
if ((service->srvstate == VCHIQ_SRVSTATE_FREE) ||
(service->srvstate == VCHIQ_SRVSTATE_LISTENING) ||
(service->srvstate == VCHIQ_SRVSTATE_OPEN))
break;
vchiq_log_warning(vchiq_core_log_level,
"%d: close_service:%d - waiting in state %s",
service->state->id, service->localport,
srvstate_names[service->srvstate]);
}
if ((status == VCHIQ_SUCCESS) &&
(service->srvstate != VCHIQ_SRVSTATE_FREE) &&
(service->srvstate != VCHIQ_SRVSTATE_LISTENING))
status = VCHIQ_ERROR;
unlock_service(service);
return status;
}
enum vchiq_status
vchiq_remove_service(unsigned int handle)
{
/* Unregister the service */
struct vchiq_service *service = find_service_by_handle(handle);
enum vchiq_status status = VCHIQ_SUCCESS;
if (!service)
return VCHIQ_ERROR;
vchiq_log_info(vchiq_core_log_level,
"%d: remove_service:%d",
service->state->id, service->localport);
if (service->srvstate == VCHIQ_SRVSTATE_FREE) {
unlock_service(service);
return VCHIQ_ERROR;
}
mark_service_closing(service);
if ((service->srvstate == VCHIQ_SRVSTATE_HIDDEN) ||
(current == service->state->slot_handler_thread)) {
/* Make it look like a client, because it must be removed and
not left in the LISTENING state. */
service->public_fourcc = VCHIQ_FOURCC_INVALID;
status = vchiq_close_service_internal(service,
0/*!close_recvd*/);
WARN_ON(status == VCHIQ_RETRY);
} else {
/* Mark the service for removal by the slot handler */
request_poll(service->state, service, VCHIQ_POLL_REMOVE);
}
while (1) {
if (wait_for_completion_interruptible(&service->remove_event)) {
status = VCHIQ_RETRY;
break;
}
if ((service->srvstate == VCHIQ_SRVSTATE_FREE) ||
(service->srvstate == VCHIQ_SRVSTATE_OPEN))
break;
vchiq_log_warning(vchiq_core_log_level,
"%d: remove_service:%d - waiting in state %s",
service->state->id, service->localport,
srvstate_names[service->srvstate]);
}
if ((status == VCHIQ_SUCCESS) &&
(service->srvstate != VCHIQ_SRVSTATE_FREE))
status = VCHIQ_ERROR;
unlock_service(service);
return status;
}
/* This function may be called by kernel threads or user threads.
* User threads may receive VCHIQ_RETRY to indicate that a signal has been
* received and the call should be retried after being returned to user
* context.
* When called in blocking mode, the userdata field points to a bulk_waiter
* structure.
*/
enum vchiq_status vchiq_bulk_transfer(unsigned int handle,
void *offset, int size, void *userdata,
enum vchiq_bulk_mode mode,
enum vchiq_bulk_dir dir)
{
struct vchiq_service *service = find_service_by_handle(handle);
struct vchiq_bulk_queue *queue;
struct vchiq_bulk *bulk;
struct vchiq_state *state;
struct bulk_waiter *bulk_waiter = NULL;
const char dir_char = (dir == VCHIQ_BULK_TRANSMIT) ? 't' : 'r';
const int dir_msgtype = (dir == VCHIQ_BULK_TRANSMIT) ?
VCHIQ_MSG_BULK_TX : VCHIQ_MSG_BULK_RX;
enum vchiq_status status = VCHIQ_ERROR;
int payload[2];
if (!service || service->srvstate != VCHIQ_SRVSTATE_OPEN ||
!offset || vchiq_check_service(service) != VCHIQ_SUCCESS)
goto error_exit;
switch (mode) {
case VCHIQ_BULK_MODE_NOCALLBACK:
case VCHIQ_BULK_MODE_CALLBACK:
break;
case VCHIQ_BULK_MODE_BLOCKING:
bulk_waiter = userdata;
init_completion(&bulk_waiter->event);
bulk_waiter->actual = 0;
bulk_waiter->bulk = NULL;
break;
case VCHIQ_BULK_MODE_WAITING:
bulk_waiter = userdata;
bulk = bulk_waiter->bulk;
goto waiting;
default:
goto error_exit;
}
state = service->state;
queue = (dir == VCHIQ_BULK_TRANSMIT) ?
&service->bulk_tx : &service->bulk_rx;
if (mutex_lock_killable(&service->bulk_mutex)) {
status = VCHIQ_RETRY;
goto error_exit;
}
if (queue->local_insert == queue->remove + VCHIQ_NUM_SERVICE_BULKS) {
VCHIQ_SERVICE_STATS_INC(service, bulk_stalls);
do {
mutex_unlock(&service->bulk_mutex);
if (wait_for_completion_interruptible(
&service->bulk_remove_event)) {
status = VCHIQ_RETRY;
goto error_exit;
}
if (mutex_lock_killable(&service->bulk_mutex)) {
status = VCHIQ_RETRY;
goto error_exit;
}
} while (queue->local_insert == queue->remove +
VCHIQ_NUM_SERVICE_BULKS);
}
bulk = &queue->bulks[BULK_INDEX(queue->local_insert)];
bulk->mode = mode;
bulk->dir = dir;
bulk->userdata = userdata;
bulk->size = size;
bulk->actual = VCHIQ_BULK_ACTUAL_ABORTED;
if (vchiq_prepare_bulk_data(bulk, offset, size, dir) != VCHIQ_SUCCESS)
goto unlock_error_exit;
wmb();
vchiq_log_info(vchiq_core_log_level,
"%d: bt (%d->%d) %cx %x@%pK %pK",
state->id, service->localport, service->remoteport, dir_char,
size, bulk->data, userdata);
/* The slot mutex must be held when the service is being closed, so
claim it here to ensure that isn't happening */
if (mutex_lock_killable(&state->slot_mutex)) {
status = VCHIQ_RETRY;
goto cancel_bulk_error_exit;
}
if (service->srvstate != VCHIQ_SRVSTATE_OPEN)
goto unlock_both_error_exit;
payload[0] = (int)(long)bulk->data;
payload[1] = bulk->size;
status = queue_message(state,
NULL,
VCHIQ_MAKE_MSG(dir_msgtype,
service->localport,
service->remoteport),
memcpy_copy_callback,
&payload,
sizeof(payload),
QMFLAGS_IS_BLOCKING |
QMFLAGS_NO_MUTEX_LOCK |
QMFLAGS_NO_MUTEX_UNLOCK);
if (status != VCHIQ_SUCCESS)
goto unlock_both_error_exit;
queue->local_insert++;
mutex_unlock(&state->slot_mutex);
mutex_unlock(&service->bulk_mutex);
vchiq_log_trace(vchiq_core_log_level,
"%d: bt:%d %cx li=%x ri=%x p=%x",
state->id,
service->localport, dir_char,
queue->local_insert, queue->remote_insert, queue->process);
waiting:
unlock_service(service);
status = VCHIQ_SUCCESS;
if (bulk_waiter) {
bulk_waiter->bulk = bulk;
if (wait_for_completion_interruptible(&bulk_waiter->event))
status = VCHIQ_RETRY;
else if (bulk_waiter->actual == VCHIQ_BULK_ACTUAL_ABORTED)
status = VCHIQ_ERROR;
}
return status;
unlock_both_error_exit:
mutex_unlock(&state->slot_mutex);
cancel_bulk_error_exit:
vchiq_complete_bulk(bulk);
unlock_error_exit:
mutex_unlock(&service->bulk_mutex);
error_exit:
if (service)
unlock_service(service);
return status;
}
enum vchiq_status
vchiq_queue_message(unsigned int handle,
ssize_t (*copy_callback)(void *context, void *dest,
size_t offset, size_t maxsize),
void *context,
size_t size)
{
struct vchiq_service *service = find_service_by_handle(handle);
enum vchiq_status status = VCHIQ_ERROR;
if (!service ||
(vchiq_check_service(service) != VCHIQ_SUCCESS))
goto error_exit;
if (!size) {
VCHIQ_SERVICE_STATS_INC(service, error_count);
goto error_exit;
}
if (size > VCHIQ_MAX_MSG_SIZE) {
VCHIQ_SERVICE_STATS_INC(service, error_count);
goto error_exit;
}
switch (service->srvstate) {
case VCHIQ_SRVSTATE_OPEN:
status = queue_message(service->state, service,
VCHIQ_MAKE_MSG(VCHIQ_MSG_DATA,
service->localport,
service->remoteport),
copy_callback, context, size, 1);
break;
case VCHIQ_SRVSTATE_OPENSYNC:
status = queue_message_sync(service->state, service,
VCHIQ_MAKE_MSG(VCHIQ_MSG_DATA,
service->localport,
service->remoteport),
copy_callback, context, size, 1);
break;
default:
status = VCHIQ_ERROR;
break;
}
error_exit:
if (service)
unlock_service(service);
return status;
}
void
vchiq_release_message(unsigned int handle,
struct vchiq_header *header)
{
struct vchiq_service *service = find_service_by_handle(handle);
struct vchiq_shared_state *remote;
struct vchiq_state *state;
int slot_index;
if (!service)
return;
state = service->state;
remote = state->remote;
slot_index = SLOT_INDEX_FROM_DATA(state, (void *)header);
if ((slot_index >= remote->slot_first) &&
(slot_index <= remote->slot_last)) {
int msgid = header->msgid;
if (msgid & VCHIQ_MSGID_CLAIMED) {
struct vchiq_slot_info *slot_info =
SLOT_INFO_FROM_INDEX(state, slot_index);
release_slot(state, slot_info, header, service);
}
} else if (slot_index == remote->slot_sync)
release_message_sync(state, header);
unlock_service(service);
}
static void
release_message_sync(struct vchiq_state *state, struct vchiq_header *header)
{
header->msgid = VCHIQ_MSGID_PADDING;
remote_event_signal(&state->remote->sync_release);
}
enum vchiq_status
vchiq_get_peer_version(unsigned int handle, short *peer_version)
{
enum vchiq_status status = VCHIQ_ERROR;
struct vchiq_service *service = find_service_by_handle(handle);
if (!service ||
(vchiq_check_service(service) != VCHIQ_SUCCESS) ||
!peer_version)
goto exit;
*peer_version = service->peer_version;
status = VCHIQ_SUCCESS;
exit:
if (service)
unlock_service(service);
return status;
}
void vchiq_get_config(struct vchiq_config *config)
{
config->max_msg_size = VCHIQ_MAX_MSG_SIZE;
config->bulk_threshold = VCHIQ_MAX_MSG_SIZE;
config->max_outstanding_bulks = VCHIQ_NUM_SERVICE_BULKS;
config->max_services = VCHIQ_MAX_SERVICES;
config->version = VCHIQ_VERSION;
config->version_min = VCHIQ_VERSION_MIN;
}
enum vchiq_status
vchiq_set_service_option(unsigned int handle,
enum vchiq_service_option option, int value)
{
struct vchiq_service *service = find_service_by_handle(handle);
enum vchiq_status status = VCHIQ_ERROR;
if (service) {
switch (option) {
case VCHIQ_SERVICE_OPTION_AUTOCLOSE:
service->auto_close = value;
status = VCHIQ_SUCCESS;
break;
case VCHIQ_SERVICE_OPTION_SLOT_QUOTA: {
struct vchiq_service_quota *service_quota =
&service->state->service_quotas[
service->localport];
if (value == 0)
value = service->state->default_slot_quota;
if ((value >= service_quota->slot_use_count) &&
(value < (unsigned short)~0)) {
service_quota->slot_quota = value;
if ((value >= service_quota->slot_use_count) &&
(service_quota->message_quota >=
service_quota->message_use_count)) {
/* Signal the service that it may have
** dropped below its quota */
complete(&service_quota->quota_event);
}
status = VCHIQ_SUCCESS;
}
} break;
case VCHIQ_SERVICE_OPTION_MESSAGE_QUOTA: {
struct vchiq_service_quota *service_quota =
&service->state->service_quotas[
service->localport];
if (value == 0)
value = service->state->default_message_quota;
if ((value >= service_quota->message_use_count) &&
(value < (unsigned short)~0)) {
service_quota->message_quota = value;
if ((value >=
service_quota->message_use_count) &&
(service_quota->slot_quota >=
service_quota->slot_use_count))
/* Signal the service that it may have
** dropped below its quota */
complete(&service_quota->quota_event);
status = VCHIQ_SUCCESS;
}
} break;
case VCHIQ_SERVICE_OPTION_SYNCHRONOUS:
if ((service->srvstate == VCHIQ_SRVSTATE_HIDDEN) ||
(service->srvstate ==
VCHIQ_SRVSTATE_LISTENING)) {
service->sync = value;
status = VCHIQ_SUCCESS;
}
break;
case VCHIQ_SERVICE_OPTION_TRACE:
service->trace = value;
status = VCHIQ_SUCCESS;
break;
default:
break;
}
unlock_service(service);
}
return status;
}
static int
vchiq_dump_shared_state(void *dump_context, struct vchiq_state *state,
struct vchiq_shared_state *shared, const char *label)
{
static const char *const debug_names[] = {
"<entries>",
"SLOT_HANDLER_COUNT",
"SLOT_HANDLER_LINE",
"PARSE_LINE",
"PARSE_HEADER",
"PARSE_MSGID",
"AWAIT_COMPLETION_LINE",
"DEQUEUE_MESSAGE_LINE",
"SERVICE_CALLBACK_LINE",
"MSG_QUEUE_FULL_COUNT",
"COMPLETION_QUEUE_FULL_COUNT"
};
int i;
char buf[80];
int len;
int err;
len = scnprintf(buf, sizeof(buf),
" %s: slots %d-%d tx_pos=%x recycle=%x",
label, shared->slot_first, shared->slot_last,
shared->tx_pos, shared->slot_queue_recycle);
err = vchiq_dump(dump_context, buf, len + 1);
if (err)
return err;
len = scnprintf(buf, sizeof(buf),
" Slots claimed:");
err = vchiq_dump(dump_context, buf, len + 1);
if (err)
return err;
for (i = shared->slot_first; i <= shared->slot_last; i++) {
struct vchiq_slot_info slot_info =
*SLOT_INFO_FROM_INDEX(state, i);
if (slot_info.use_count != slot_info.release_count) {
len = scnprintf(buf, sizeof(buf),
" %d: %d/%d", i, slot_info.use_count,
slot_info.release_count);
err = vchiq_dump(dump_context, buf, len + 1);
if (err)
return err;
}
}
for (i = 1; i < shared->debug[DEBUG_ENTRIES]; i++) {
len = scnprintf(buf, sizeof(buf), " DEBUG: %s = %d(%x)",
debug_names[i], shared->debug[i], shared->debug[i]);
err = vchiq_dump(dump_context, buf, len + 1);
if (err)
return err;
}
return 0;
}
int vchiq_dump_state(void *dump_context, struct vchiq_state *state)
{
char buf[80];
int len;
int i;
int err;
len = scnprintf(buf, sizeof(buf), "State %d: %s", state->id,
conn_state_names[state->conn_state]);
err = vchiq_dump(dump_context, buf, len + 1);
if (err)
return err;
len = scnprintf(buf, sizeof(buf),
" tx_pos=%x(@%pK), rx_pos=%x(@%pK)",
state->local->tx_pos,
state->tx_data + (state->local_tx_pos & VCHIQ_SLOT_MASK),
state->rx_pos,
state->rx_data + (state->rx_pos & VCHIQ_SLOT_MASK));
err = vchiq_dump(dump_context, buf, len + 1);
if (err)
return err;
len = scnprintf(buf, sizeof(buf),
" Version: %d (min %d)",
VCHIQ_VERSION, VCHIQ_VERSION_MIN);
err = vchiq_dump(dump_context, buf, len + 1);
if (err)
return err;
if (VCHIQ_ENABLE_STATS) {
len = scnprintf(buf, sizeof(buf),
" Stats: ctrl_tx_count=%d, ctrl_rx_count=%d, "
"error_count=%d",
state->stats.ctrl_tx_count, state->stats.ctrl_rx_count,
state->stats.error_count);
err = vchiq_dump(dump_context, buf, len + 1);
if (err)
return err;
}
len = scnprintf(buf, sizeof(buf),
" Slots: %d available (%d data), %d recyclable, %d stalls "
"(%d data)",
((state->slot_queue_available * VCHIQ_SLOT_SIZE) -
state->local_tx_pos) / VCHIQ_SLOT_SIZE,
state->data_quota - state->data_use_count,
state->local->slot_queue_recycle - state->slot_queue_available,
state->stats.slot_stalls, state->stats.data_stalls);
err = vchiq_dump(dump_context, buf, len + 1);
if (err)
return err;
err = vchiq_dump_platform_state(dump_context);
if (err)
return err;
err = vchiq_dump_shared_state(dump_context,
state,
state->local,
"Local");
if (err)
return err;
err = vchiq_dump_shared_state(dump_context,
state,
state->remote,
"Remote");
if (err)
return err;
err = vchiq_dump_platform_instances(dump_context);
if (err)
return err;
for (i = 0; i < state->unused_service; i++) {
struct vchiq_service *service = find_service_by_port(state, i);
if (service) {
err = vchiq_dump_service_state(dump_context, service);
unlock_service(service);
if (err)
return err;
}
}
return 0;
}
int vchiq_dump_service_state(void *dump_context, struct vchiq_service *service)
{
char buf[80];
int len;
int err;
len = scnprintf(buf, sizeof(buf), "Service %u: %s (ref %u)",
service->localport, srvstate_names[service->srvstate],
service->ref_count - 1); /*Don't include the lock just taken*/
if (service->srvstate != VCHIQ_SRVSTATE_FREE) {
char remoteport[30];
struct vchiq_service_quota *service_quota =
&service->state->service_quotas[service->localport];
int fourcc = service->base.fourcc;
int tx_pending, rx_pending;
if (service->remoteport != VCHIQ_PORT_FREE) {
int len2 = scnprintf(remoteport, sizeof(remoteport),
"%u", service->remoteport);
if (service->public_fourcc != VCHIQ_FOURCC_INVALID)
scnprintf(remoteport + len2,
sizeof(remoteport) - len2,
" (client %x)", service->client_id);
} else
strcpy(remoteport, "n/a");
len += scnprintf(buf + len, sizeof(buf) - len,
" '%c%c%c%c' remote %s (msg use %d/%d, slot use %d/%d)",
VCHIQ_FOURCC_AS_4CHARS(fourcc),
remoteport,
service_quota->message_use_count,
service_quota->message_quota,
service_quota->slot_use_count,
service_quota->slot_quota);
err = vchiq_dump(dump_context, buf, len + 1);
if (err)
return err;
tx_pending = service->bulk_tx.local_insert -
service->bulk_tx.remote_insert;
rx_pending = service->bulk_rx.local_insert -
service->bulk_rx.remote_insert;
len = scnprintf(buf, sizeof(buf),
" Bulk: tx_pending=%d (size %d),"
" rx_pending=%d (size %d)",
tx_pending,
tx_pending ? service->bulk_tx.bulks[
BULK_INDEX(service->bulk_tx.remove)].size : 0,
rx_pending,
rx_pending ? service->bulk_rx.bulks[
BULK_INDEX(service->bulk_rx.remove)].size : 0);
if (VCHIQ_ENABLE_STATS) {
err = vchiq_dump(dump_context, buf, len + 1);
if (err)
return err;
len = scnprintf(buf, sizeof(buf),
" Ctrl: tx_count=%d, tx_bytes=%llu, "
"rx_count=%d, rx_bytes=%llu",
service->stats.ctrl_tx_count,
service->stats.ctrl_tx_bytes,
service->stats.ctrl_rx_count,
service->stats.ctrl_rx_bytes);
err = vchiq_dump(dump_context, buf, len + 1);
if (err)
return err;
len = scnprintf(buf, sizeof(buf),
" Bulk: tx_count=%d, tx_bytes=%llu, "
"rx_count=%d, rx_bytes=%llu",
service->stats.bulk_tx_count,
service->stats.bulk_tx_bytes,
service->stats.bulk_rx_count,
service->stats.bulk_rx_bytes);
err = vchiq_dump(dump_context, buf, len + 1);
if (err)
return err;
len = scnprintf(buf, sizeof(buf),
" %d quota stalls, %d slot stalls, "
"%d bulk stalls, %d aborted, %d errors",
service->stats.quota_stalls,
service->stats.slot_stalls,
service->stats.bulk_stalls,
service->stats.bulk_aborted_count,
service->stats.error_count);
}
}
err = vchiq_dump(dump_context, buf, len + 1);
if (err)
return err;
if (service->srvstate != VCHIQ_SRVSTATE_FREE)
err = vchiq_dump_platform_service_state(dump_context, service);
return err;
}
void
vchiq_loud_error_header(void)
{
vchiq_log_error(vchiq_core_log_level,
"============================================================"
"================");
vchiq_log_error(vchiq_core_log_level,
"============================================================"
"================");
vchiq_log_error(vchiq_core_log_level, "=====");
}
void
vchiq_loud_error_footer(void)
{
vchiq_log_error(vchiq_core_log_level, "=====");
vchiq_log_error(vchiq_core_log_level,
"============================================================"
"================");
vchiq_log_error(vchiq_core_log_level,
"============================================================"
"================");
}
enum vchiq_status vchiq_send_remote_use(struct vchiq_state *state)
{
enum vchiq_status status = VCHIQ_RETRY;
if (state->conn_state != VCHIQ_CONNSTATE_DISCONNECTED)
status = queue_message(state, NULL,
VCHIQ_MAKE_MSG(VCHIQ_MSG_REMOTE_USE, 0, 0),
NULL, NULL, 0, 0);
return status;
}
enum vchiq_status vchiq_send_remote_use_active(struct vchiq_state *state)
{
enum vchiq_status status = VCHIQ_RETRY;
if (state->conn_state != VCHIQ_CONNSTATE_DISCONNECTED)
status = queue_message(state, NULL,
VCHIQ_MAKE_MSG(VCHIQ_MSG_REMOTE_USE_ACTIVE, 0, 0),
NULL, NULL, 0, 0);
return status;
}
void vchiq_log_dump_mem(const char *label, u32 addr, const void *void_mem,
size_t num_bytes)
{
const u8 *mem = void_mem;
size_t offset;
char line_buf[100];
char *s;
while (num_bytes > 0) {
s = line_buf;
for (offset = 0; offset < 16; offset++) {
if (offset < num_bytes)
s += scnprintf(s, 4, "%02x ", mem[offset]);
else
s += scnprintf(s, 4, " ");
}
for (offset = 0; offset < 16; offset++) {
if (offset < num_bytes) {
u8 ch = mem[offset];
if ((ch < ' ') || (ch > '~'))
ch = '.';
*s++ = (char)ch;
}
}
*s++ = '\0';
if (label && (*label != '\0'))
vchiq_log_trace(VCHIQ_LOG_TRACE,
"%s: %08x: %s", label, addr, line_buf);
else
vchiq_log_trace(VCHIQ_LOG_TRACE,
"%08x: %s", addr, line_buf);
addr += 16;
mem += 16;
if (num_bytes > 16)
num_bytes -= 16;
else
num_bytes = 0;
}
}
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