Release 4.11 drivers/staging/greybus/operation.c
/*
* Greybus operations
*
* Copyright 2014-2015 Google Inc.
* Copyright 2014-2015 Linaro Ltd.
*
* Released under the GPLv2 only.
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
#include "greybus.h"
#include "greybus_trace.h"
static struct kmem_cache *gb_operation_cache;
static struct kmem_cache *gb_message_cache;
/* Workqueue to handle Greybus operation completions. */
static struct workqueue_struct *gb_operation_completion_wq;
/* Wait queue for synchronous cancellations. */
static DECLARE_WAIT_QUEUE_HEAD(gb_operation_cancellation_queue);
/*
* Protects updates to operation->errno.
*/
static DEFINE_SPINLOCK(gb_operations_lock);
static int gb_operation_response_send(struct gb_operation *operation,
int errno);
/*
* Increment operation active count and add to connection list unless the
* connection is going away.
*
* Caller holds operation reference.
*/
static int gb_operation_get_active(struct gb_operation *operation)
{
struct gb_connection *connection = operation->connection;
unsigned long flags;
spin_lock_irqsave(&connection->lock, flags);
switch (connection->state) {
case GB_CONNECTION_STATE_ENABLED:
break;
case GB_CONNECTION_STATE_ENABLED_TX:
if (gb_operation_is_incoming(operation))
goto err_unlock;
break;
case GB_CONNECTION_STATE_DISCONNECTING:
if (!gb_operation_is_core(operation))
goto err_unlock;
break;
default:
goto err_unlock;
}
if (operation->active++ == 0)
list_add_tail(&operation->links, &connection->operations);
trace_gb_operation_get_active(operation);
spin_unlock_irqrestore(&connection->lock, flags);
return 0;
err_unlock:
spin_unlock_irqrestore(&connection->lock, flags);
return -ENOTCONN;
}
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/* Caller holds operation reference. */
static void gb_operation_put_active(struct gb_operation *operation)
{
struct gb_connection *connection = operation->connection;
unsigned long flags;
spin_lock_irqsave(&connection->lock, flags);
trace_gb_operation_put_active(operation);
if (--operation->active == 0) {
list_del(&operation->links);
if (atomic_read(&operation->waiters))
wake_up(&gb_operation_cancellation_queue);
}
spin_unlock_irqrestore(&connection->lock, flags);
}
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| Total | 84 | 100.00% | 5 | 100.00% |
static bool gb_operation_is_active(struct gb_operation *operation)
{
struct gb_connection *connection = operation->connection;
unsigned long flags;
bool ret;
spin_lock_irqsave(&connection->lock, flags);
ret = operation->active;
spin_unlock_irqrestore(&connection->lock, flags);
return ret;
}
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/*
* Set an operation's result.
*
* Initially an outgoing operation's errno value is -EBADR.
* If no error occurs before sending the request message the only
* valid value operation->errno can be set to is -EINPROGRESS,
* indicating the request has been (or rather is about to be) sent.
* At that point nobody should be looking at the result until the
* response arrives.
*
* The first time the result gets set after the request has been
* sent, that result "sticks." That is, if two concurrent threads
* race to set the result, the first one wins. The return value
* tells the caller whether its result was recorded; if not the
* caller has nothing more to do.
*
* The result value -EILSEQ is reserved to signal an implementation
* error; if it's ever observed, the code performing the request has
* done something fundamentally wrong. It is an error to try to set
* the result to -EBADR, and attempts to do so result in a warning,
* and -EILSEQ is used instead. Similarly, the only valid result
* value to set for an operation in initial state is -EINPROGRESS.
* Attempts to do otherwise will also record a (successful) -EILSEQ
* operation result.
*/
static bool gb_operation_result_set(struct gb_operation *operation, int result)
{
unsigned long flags;
int prev;
if (result == -EINPROGRESS) {
/*
* -EINPROGRESS is used to indicate the request is
* in flight. It should be the first result value
* set after the initial -EBADR. Issue a warning
* and record an implementation error if it's
* set at any other time.
*/
spin_lock_irqsave(&gb_operations_lock, flags);
prev = operation->errno;
if (prev == -EBADR)
operation->errno = result;
else
operation->errno = -EILSEQ;
spin_unlock_irqrestore(&gb_operations_lock, flags);
WARN_ON(prev != -EBADR);
return true;
}
/*
* The first result value set after a request has been sent
* will be the final result of the operation. Subsequent
* attempts to set the result are ignored.
*
* Note that -EBADR is a reserved "initial state" result
* value. Attempts to set this value result in a warning,
* and the result code is set to -EILSEQ instead.
*/
if (WARN_ON(result == -EBADR))
result = -EILSEQ; /* Nobody should be setting -EBADR */
spin_lock_irqsave(&gb_operations_lock, flags);
prev = operation->errno;
if (prev == -EINPROGRESS)
operation->errno = result; /* First and final result */
spin_unlock_irqrestore(&gb_operations_lock, flags);
return prev == -EINPROGRESS;
}
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| Total | 144 | 100.00% | 6 | 100.00% |
int gb_operation_result(struct gb_operation *operation)
{
int result = operation->errno;
WARN_ON(result == -EBADR);
WARN_ON(result == -EINPROGRESS);
return result;
}
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| Alex Elder | 36 | 100.00% | 3 | 100.00% |
| Total | 36 | 100.00% | 3 | 100.00% |
EXPORT_SYMBOL_GPL(gb_operation_result);
/*
* Looks up an outgoing operation on a connection and returns a refcounted
* pointer if found, or NULL otherwise.
*/
static struct gb_operation *
gb_operation_find_outgoing(struct gb_connection *connection, u16 operation_id)
{
struct gb_operation *operation;
unsigned long flags;
bool found = false;
spin_lock_irqsave(&connection->lock, flags);
list_for_each_entry(operation, &connection->operations, links)
if (operation->id == operation_id &&
!gb_operation_is_incoming(operation)) {
gb_operation_get(operation);
found = true;
break;
}
spin_unlock_irqrestore(&connection->lock, flags);
return found ? operation : NULL;
}
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| Alex Elder | 63 | 69.23% | 4 | 50.00% |
| Johan Hovold | 28 | 30.77% | 4 | 50.00% |
| Total | 91 | 100.00% | 8 | 100.00% |
static int gb_message_send(struct gb_message *message, gfp_t gfp)
{
struct gb_connection *connection = message->operation->connection;
trace_gb_message_send(message);
return connection->hd->driver->message_send(connection->hd,
connection->hd_cport_id,
message,
gfp);
}
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| Alex Elder | 41 | 78.85% | 5 | 50.00% |
| Johan Hovold | 6 | 11.54% | 4 | 40.00% |
| Bryan O'Donoghue | 5 | 9.62% | 1 | 10.00% |
| Total | 52 | 100.00% | 10 | 100.00% |
/*
* Cancel a message we have passed to the host device layer to be sent.
*/
static void gb_message_cancel(struct gb_message *message)
{
struct gb_host_device *hd = message->operation->connection->hd;
hd->driver->message_cancel(message);
}
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| Alex Elder | 29 | 87.88% | 4 | 57.14% |
| Johan Hovold | 4 | 12.12% | 3 | 42.86% |
| Total | 33 | 100.00% | 7 | 100.00% |
static void gb_operation_request_handle(struct gb_operation *operation)
{
struct gb_connection *connection = operation->connection;
int status;
int ret;
if (connection->handler) {
status = connection->handler(operation);
} else {
dev_err(&connection->hd->dev,
"%s: unexpected incoming request of type 0x%02x\n",
connection->name, operation->type);
status = -EPROTONOSUPPORT;
}
ret = gb_operation_response_send(operation, status);
if (ret) {
dev_err(&connection->hd->dev,
"%s: failed to send response %d for type 0x%02x: %d\n",
connection->name, status, operation->type, ret);
return;
}
}
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| Johan Hovold | 56 | 50.45% | 5 | 45.45% |
| Alex Elder | 45 | 40.54% | 2 | 18.18% |
| Viresh Kumar | 6 | 5.41% | 2 | 18.18% |
| Greg Kroah-Hartman | 4 | 3.60% | 2 | 18.18% |
| Total | 111 | 100.00% | 11 | 100.00% |
/*
* Process operation work.
*
* For incoming requests, call the protocol request handler. The operation
* result should be -EINPROGRESS at this point.
*
* For outgoing requests, the operation result value should have
* been set before queueing this. The operation callback function
* allows the original requester to know the request has completed
* and its result is available.
*/
static void gb_operation_work(struct work_struct *work)
{
struct gb_operation *operation;
int ret;
operation = container_of(work, struct gb_operation, work);
if (gb_operation_is_incoming(operation)) {
gb_operation_request_handle(operation);
} else {
ret = del_timer_sync(&operation->timer);
if (!ret) {
/* Cancel request message if scheduled by timeout. */
if (gb_operation_result(operation) == -ETIMEDOUT)
gb_message_cancel(operation->request);
}
operation->callback(operation);
}
gb_operation_put_active(operation);
gb_operation_put(operation);
}
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| Johan Hovold | 60 | 60.00% | 3 | 37.50% |
| Alex Elder | 40 | 40.00% | 5 | 62.50% |
| Total | 100 | 100.00% | 8 | 100.00% |
static void gb_operation_timeout(unsigned long arg)
{
struct gb_operation *operation = (void *)arg;
if (gb_operation_result_set(operation, -ETIMEDOUT)) {
/*
* A stuck request message will be cancelled from the
* workqueue.
*/
queue_work(gb_operation_completion_wq, &operation->work);
}
}
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| Johan Hovold | 44 | 100.00% | 1 | 100.00% |
| Total | 44 | 100.00% | 1 | 100.00% |
static void gb_operation_message_init(struct gb_host_device *hd,
struct gb_message *message, u16 operation_id,
size_t payload_size, u8 type)
{
struct gb_operation_msg_hdr *header;
header = message->buffer;
message->header = header;
message->payload = payload_size ? header + 1 : NULL;
message->payload_size = payload_size;
/*
* The type supplied for incoming message buffers will be
* GB_REQUEST_TYPE_INVALID. Such buffers will be overwritten by
* arriving data so there's no need to initialize the message header.
*/
if (type != GB_REQUEST_TYPE_INVALID) {
u16 message_size = (u16)(sizeof(*header) + payload_size);
/*
* For a request, the operation id gets filled in
* when the message is sent. For a response, it
* will be copied from the request by the caller.
*
* The result field in a request message must be
* zero. It will be set just prior to sending for
* a response.
*/
header->size = cpu_to_le16(message_size);
header->operation_id = 0;
header->type = type;
header->result = 0;
}
}
Contributors
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| Alex Elder | 108 | 95.58% | 4 | 57.14% |
| Johan Hovold | 5 | 4.42% | 3 | 42.86% |
| Total | 113 | 100.00% | 7 | 100.00% |
/*
* Allocate a message to be used for an operation request or response.
* Both types of message contain a common header. The request message
* for an outgoing operation is outbound, as is the response message
* for an incoming operation. The message header for an outbound
* message is partially initialized here.
*
* The headers for inbound messages don't need to be initialized;
* they'll be filled in by arriving data.
*
* Our message buffers have the following layout:
* message header \_ these combined are
* message payload / the message size
*/
static struct gb_message *
gb_operation_message_alloc(struct gb_host_device *hd, u8 type,
size_t payload_size, gfp_t gfp_flags)
{
struct gb_message *message;
struct gb_operation_msg_hdr *header;
size_t message_size = payload_size + sizeof(*header);
if (message_size > hd->buffer_size_max) {
dev_warn(&hd->dev, "requested message size too big (%zu > %zu)\n",
message_size, hd->buffer_size_max);
return NULL;
}
/* Allocate the message structure and buffer. */
message = kmem_cache_zalloc(gb_message_cache, gfp_flags);
if (!message)
return NULL;
message->buffer = kzalloc(message_size, gfp_flags);
if (!message->buffer)
goto err_free_message;
/* Initialize the message. Operation id is filled in later. */
gb_operation_message_init(hd, message, 0, payload_size, type);
return message;
err_free_message:
kmem_cache_free(gb_message_cache, message);
return NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Elder | 97 | 69.29% | 16 | 76.19% |
| Johan Hovold | 42 | 30.00% | 4 | 19.05% |
| Greg Kroah-Hartman | 1 | 0.71% | 1 | 4.76% |
| Total | 140 | 100.00% | 21 | 100.00% |
static void gb_operation_message_free(struct gb_message *message)
{
kfree(message->buffer);
kmem_cache_free(gb_message_cache, message);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Elder | 22 | 88.00% | 4 | 80.00% |
| Johan Hovold | 3 | 12.00% | 1 | 20.00% |
| Total | 25 | 100.00% | 5 | 100.00% |
/*
* Map an enum gb_operation_status value (which is represented in a
* message as a single byte) to an appropriate Linux negative errno.
*/
static int gb_operation_status_map(u8 status)
{
switch (status) {
case GB_OP_SUCCESS:
return 0;
case GB_OP_INTERRUPTED:
return -EINTR;
case GB_OP_TIMEOUT:
return -ETIMEDOUT;
case GB_OP_NO_MEMORY:
return -ENOMEM;
case GB_OP_PROTOCOL_BAD:
return -EPROTONOSUPPORT;
case GB_OP_OVERFLOW:
return -EMSGSIZE;
case GB_OP_INVALID:
return -EINVAL;
case GB_OP_RETRY:
return -EAGAIN;
case GB_OP_NONEXISTENT:
return -ENODEV;
case GB_OP_MALFUNCTION:
return -EILSEQ;
case GB_OP_UNKNOWN_ERROR:
default:
return -EIO;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Elder | 92 | 100.00% | 4 | 100.00% |
| Total | 92 | 100.00% | 4 | 100.00% |
/*
* Map a Linux errno value (from operation->errno) into the value
* that should represent it in a response message status sent
* over the wire. Returns an enum gb_operation_status value (which
* is represented in a message as a single byte).
*/
static u8 gb_operation_errno_map(int errno)
{
switch (errno) {
case 0:
return GB_OP_SUCCESS;
case -EINTR:
return GB_OP_INTERRUPTED;
case -ETIMEDOUT:
return GB_OP_TIMEOUT;
case -ENOMEM:
return GB_OP_NO_MEMORY;
case -EPROTONOSUPPORT:
return GB_OP_PROTOCOL_BAD;
case -EMSGSIZE:
return GB_OP_OVERFLOW; /* Could be underflow too */
case -EINVAL:
return GB_OP_INVALID;
case -EAGAIN:
return GB_OP_RETRY;
case -EILSEQ:
return GB_OP_MALFUNCTION;
case -ENODEV:
return GB_OP_NONEXISTENT;
case -EIO:
default:
return GB_OP_UNKNOWN_ERROR;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Elder | 93 | 100.00% | 2 | 100.00% |
| Total | 93 | 100.00% | 2 | 100.00% |
bool gb_operation_response_alloc(struct gb_operation *operation,
size_t response_size, gfp_t gfp)
{
struct gb_host_device *hd = operation->connection->hd;
struct gb_operation_msg_hdr *request_header;
struct gb_message *response;
u8 type;
type = operation->type | GB_MESSAGE_TYPE_RESPONSE;
response = gb_operation_message_alloc(hd, type, response_size, gfp);
if (!response)
return false;
response->operation = operation;
/*
* Size and type get initialized when the message is
* allocated. The errno will be set before sending. All
* that's left is the operation id, which we copy from the
* request message header (as-is, in little-endian order).
*/
request_header = operation->request->header;
response->header->operation_id = request_header->operation_id;
operation->response = response;
return true;
}
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| Alex Elder | 98 | 95.15% | 3 | 60.00% |
| Johan Hovold | 5 | 4.85% | 2 | 40.00% |
| Total | 103 | 100.00% | 5 | 100.00% |
EXPORT_SYMBOL_GPL(gb_operation_response_alloc);
/*
* Create a Greybus operation to be sent over the given connection.
* The request buffer will be big enough for a payload of the given
* size.
*
* For outgoing requests, the request message's header will be
* initialized with the type of the request and the message size.
* Outgoing operations must also specify the response buffer size,
* which must be sufficient to hold all expected response data. The
* response message header will eventually be overwritten, so there's
* no need to initialize it here.
*
* Request messages for incoming operations can arrive in interrupt
* context, so they must be allocated with GFP_ATOMIC. In this case
* the request buffer will be immediately overwritten, so there is
* no need to initialize the message header. Responsibility for
* allocating a response buffer lies with the incoming request
* handler for a protocol. So we don't allocate that here.
*
* Returns a pointer to the new operation or a null pointer if an
* error occurs.
*/
static struct gb_operation *
gb_operation_create_common(struct gb_connection *connection, u8 type,
size_t request_size, size_t response_size,
unsigned long op_flags, gfp_t gfp_flags)
{
struct gb_host_device *hd = connection->hd;
struct gb_operation *operation;
operation = kmem_cache_zalloc(gb_operation_cache, gfp_flags);
if (!operation)
return NULL;
operation->connection = connection;
operation->request = gb_operation_message_alloc(hd, type, request_size,
gfp_flags);
if (!operation->request)
goto err_cache;
operation->request->operation = operation;
/* Allocate the response buffer for outgoing operations */
if (!(op_flags & GB_OPERATION_FLAG_INCOMING)) {
if (!gb_operation_response_alloc(operation, response_size,
gfp_flags)) {
goto err_request;
}
setup_timer(&operation->timer, gb_operation_timeout,
(unsigned long)operation);
}
operation->flags = op_flags;
operation->type = type;
operation->errno = -EBADR; /* Initial value--means "never set" */
INIT_WORK(&operation->work, gb_operation_work);
init_completion(&operation->completion);
kref_init(&operation->kref);
atomic_set(&operation->waiters, 0);
return operation;
err_request:
gb_operation_message_free(operation->request);
err_cache:
kmem_cache_free(gb_operation_cache, operation);
return NULL;
}
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| Person | Tokens | Prop | Commits | CommitProp |
| Alex Elder | 173 | 77.23% | 13 | 65.00% |
| Johan Hovold | 51 | 22.77% | 7 | 35.00% |
| Total | 224 | 100.00% | 20 | 100.00% |
/*
* Create a new operation associated with the given connection. The
* request and response sizes provided are the number of bytes
* required to hold the request/response payload only. Both of
* these are allowed to be 0. Note that 0x00 is reserved as an
* invalid operation type for all protocols, and this is enforced
* here.
*/
struct gb_operation *
gb_operation_create_flags(struct gb_connection *connection,
u8 type, size_t request_size,
size_t response_size, unsigned long flags,
gfp_t gfp)
{
struct gb_operation *operation;
if (WARN_ON_ONCE(type == GB_REQUEST_TYPE_INVALID))
return NULL;
if (WARN_ON_ONCE(type & GB_MESSAGE_TYPE_RESPONSE))
type &= ~GB_MESSAGE_TYPE_RESPONSE;
if (WARN_ON_ONCE(flags & ~GB_OPERATION_FLAG_USER_MASK))
flags &= GB_OPERATION_FLAG_USER_MASK;
operation = gb_operation_create_common(connection, type,
request_size, response_size,
flags, gfp);
if (operation)
trace_gb_operation_create(operation);
return operation;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Elder | 75 | 73.53% | 5 | 55.56% |
| Johan Hovold | 27 | 26.47% | 4 | 44.44% |
| Total | 102 | 100.00% | 9 | 100.00% |
EXPORT_SYMBOL_GPL(gb_operation_create_flags);
struct gb_operation *
gb_operation_create_core(struct gb_connection *connection,
u8 type, size_t request_size,
size_t response_size, unsigned long flags,
gfp_t gfp)
{
struct gb_operation *operation;
flags |= GB_OPERATION_FLAG_CORE;
operation = gb_operation_create_common(connection, type,
request_size, response_size,
flags, gfp);
if (operation)
trace_gb_operation_create_core(operation);
return operation;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Johan Hovold | 66 | 100.00% | 1 | 100.00% |
| Total | 66 | 100.00% | 1 | 100.00% |
/* Do not export this function. */
size_t gb_operation_get_payload_size_max(struct gb_connection *connection)
{
struct gb_host_device *hd = connection->hd;
return hd->buffer_size_max - sizeof(struct gb_operation_msg_hdr);
}
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| Johan Hovold | 30 | 100.00% | 2 | 100.00% |
| Total | 30 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(gb_operation_get_payload_size_max);
static struct gb_operation *
gb_operation_create_incoming(struct gb_connection *connection, u16 id,
u8 type, void *data, size_t size)
{
struct gb_operation *operation;
size_t request_size;
unsigned long flags = GB_OPERATION_FLAG_INCOMING;
/* Caller has made sure we at least have a message header. */
request_size = size - sizeof(struct gb_operation_msg_hdr);
if (!id)
flags |= GB_OPERATION_FLAG_UNIDIRECTIONAL;
operation = gb_operation_create_common(connection, type,
request_size,
GB_REQUEST_TYPE_INVALID,
flags, GFP_ATOMIC);
if (!operation)
return NULL;
operation->id = id;
memcpy(operation->request->header, data, size);
trace_gb_operation_create_incoming(operation);
return operation;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Elder | 71 | 63.39% | 5 | 45.45% |
| Johan Hovold | 41 | 36.61% | 6 | 54.55% |
| Total | 112 | 100.00% | 11 | 100.00% |
/*
* Get an additional reference on an operation.
*/
void gb_operation_get(struct gb_operation *operation)
{
kref_get(&operation->kref);
}
Contributors
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| Alex Elder | 18 | 100.00% | 1 | 100.00% |
| Total | 18 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL_GPL(gb_operation_get);
/*
* Destroy a previously created operation.
*/
static void _gb_operation_destroy(struct kref *kref)
{
struct gb_operation *operation;
operation = container_of(kref, struct gb_operation, kref);
trace_gb_operation_destroy(operation);
if (operation->response)
gb_operation_message_free(operation->response);
gb_operation_message_free(operation->request);
kmem_cache_free(gb_operation_cache, operation);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Elder | 54 | 90.00% | 6 | 85.71% |
| Johan Hovold | 6 | 10.00% | 1 | 14.29% |
| Total | 60 | 100.00% | 7 | 100.00% |
/*
* Drop a reference on an operation, and destroy it when the last
* one is gone.
*/
void gb_operation_put(struct gb_operation *operation)
{
if (WARN_ON(!operation))
return;
kref_put(&operation->kref, _gb_operation_destroy);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Elder | 27 | 93.10% | 1 | 33.33% |
| Johan Hovold | 2 | 6.90% | 2 | 66.67% |
| Total | 29 | 100.00% | 3 | 100.00% |
EXPORT_SYMBOL_GPL(gb_operation_put);
/* Tell the requester we're done */
static void gb_operation_sync_callback(struct gb_operation *operation)
{
complete(&operation->completion);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Elder | 19 | 100.00% | 1 | 100.00% |
| Total | 19 | 100.00% | 1 | 100.00% |
/**
* gb_operation_request_send() - send an operation request message
* @operation: the operation to initiate
* @callback: the operation completion callback
* @timeout: operation timeout in milliseconds, or zero for no timeout
* @gfp: the memory flags to use for any allocations
*
* The caller has filled in any payload so the request message is ready to go.
* The callback function supplied will be called when the response message has
* arrived, a unidirectional request has been sent, or the operation is
* cancelled, indicating that the operation is complete. The callback function
* can fetch the result of the operation using gb_operation_result() if
* desired.
*
* Return: 0 if the request was successfully queued in the host-driver queues,
* or a negative errno.
*/
int gb_operation_request_send(struct gb_operation *operation,
gb_operation_callback callback,
unsigned int timeout,
gfp_t gfp)
{
struct gb_connection *connection = operation->connection;
struct gb_operation_msg_hdr *header;
unsigned int cycle;
int ret;
if (gb_connection_is_offloaded(connection))
return -EBUSY;
if (!callback)
return -EINVAL;
/*
* Record the callback function, which is executed in
* non-atomic (workqueue) context when the final result
* of an operation has been set.
*/
operation->callback = callback;
/*
* Assign the operation's id, and store it in the request header.
* Zero is a reserved operation id for unidirectional operations.
*/
if (gb_operation_is_unidirectional(operation)) {
operation->id = 0;
} else {
cycle = (unsigned int)atomic_inc_return(&connection->op_cycle);
operation->id = (u16)(cycle % U16_MAX + 1);
}
header = operation->request->header;
header->operation_id = cpu_to_le16(operation->id);
gb_operation_result_set(operation, -EINPROGRESS);
/*
* Get an extra reference on the operation. It'll be dropped when the
* operation completes.
*/
gb_operation_get(operation);
ret = gb_operation_get_active(operation);
if (ret)
goto err_put;
ret = gb_message_send(operation->request, gfp);
if (ret)
goto err_put_active;
if (timeout) {
operation->timer.expires = jiffies + msecs_to_jiffies(timeout);
add_timer(&operation->timer);
}
return 0;
err_put_active:
gb_operation_put_active(operation);
err_put:
gb_operation_put(operation);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Johan Hovold | 125 | 54.82% | 9 | 52.94% |
| Alex Elder | 103 | 45.18% | 8 | 47.06% |
| Total | 228 | 100.00% | 17 | 100.00% |
EXPORT_SYMBOL_GPL(gb_operation_request_send);
/*
* Send a synchronous operation. This function is expected to
* block, returning only when the response has arrived, (or when an
* error is detected. The return value is the result of the
* operation.
*/
int gb_operation_request_send_sync_timeout(struct gb_operation *operation,
unsigned int timeout)
{
int ret;
ret = gb_operation_request_send(operation, gb_operation_sync_callback,
timeout, GFP_KERNEL);
if (ret)
return ret;
ret = wait_for_completion_interruptible(&operation->completion);
if (ret < 0) {
/* Cancel the operation if interrupted */
gb_operation_cancel(operation, -ECANCELED);
}
return gb_operation_result(operation);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Elder | 57 | 81.43% | 5 | 55.56% |
| Johan Hovold | 10 | 14.29% | 3 | 33.33% |
| Perry Hung | 3 | 4.29% | 1 | 11.11% |
| Total | 70 | 100.00% | 9 | 100.00% |
EXPORT_SYMBOL_GPL(gb_operation_request_send_sync_timeout);
/*
* Send a response for an incoming operation request. A non-zero
* errno indicates a failed operation.
*
* If there is any response payload, the incoming request handler is
* responsible for allocating the response message. Otherwise the
* it can simply supply the result errno; this function will
* allocate the response message if necessary.
*/
static int gb_operation_response_send(struct gb_operation *operation,
int errno)
{
struct gb_connection *connection = operation->connection;
int ret;
if (!operation->response &&
!gb_operation_is_unidirectional(operation)) {
if (!gb_operation_response_alloc(operation, 0, GFP_KERNEL))
return -ENOMEM;
}
/* Record the result */
if (!gb_operation_result_set(operation, errno)) {
dev_err(&connection->hd->dev, "request result already set\n");
return -EIO; /* Shouldn't happen */
}
/* Sender of request does not care about response. */
if (gb_operation_is_unidirectional(operation))
return 0;
/* Reference will be dropped when message has been sent. */
gb_operation_get(operation);
ret = gb_operation_get_active(operation);
if (ret)
goto err_put;
/* Fill in the response header and send it */
operation->response->header->result = gb_operation_errno_map(errno);
ret = gb_message_send(operation->response, GFP_KERNEL);
if (ret)
goto err_put_active;
return 0;
err_put_active:
gb_operation_put_active(operation);
err_put:
gb_operation_put(operation);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Johan Hovold | 113 | 66.47% | 11 | 73.33% |
| Alex Elder | 56 | 32.94% | 3 | 20.00% |
| Greg Kroah-Hartman | 1 | 0.59% | 1 | 6.67% |
| Total | 170 | 100.00% | 15 | 100.00% |
/*
* This function is called when a message send request has completed.
*/
void greybus_message_sent(struct gb_host_device *hd,
struct gb_message *message, int status)
{
struct gb_operation *operation = message->operation;
struct gb_connection *connection = operation->connection;
/*
* If the message was a response, we just need to drop our
* reference to the operation. If an error occurred, report
* it.
*
* For requests, if there's no error and the operation in not
* unidirectional, there's nothing more to do until the response
* arrives. If an error occurred attempting to send it, or if the
* operation is unidrectional, record the result of the operation and
* schedule its completion.
*/
if (message == operation->response) {
if (status) {
dev_err(&connection->hd->dev,
"%s: error sending response 0x%02x: %d\n",
connection->name, operation->type, status);
}
gb_operation_put_active(operation);
gb_operation_put(operation);
} else if (status || gb_operation_is_unidirectional(operation)) {
if (gb_operation_result_set(operation, status)) {
queue_work(gb_operation_completion_wq,
&operation->work);
}
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Elder | 69 | 58.47% | 5 | 31.25% |
| Johan Hovold | 43 | 36.44% | 8 | 50.00% |
| Viresh Kumar | 5 | 4.24% | 2 | 12.50% |
| Greg Kroah-Hartman | 1 | 0.85% | 1 | 6.25% |
| Total | 118 | 100.00% | 16 | 100.00% |
EXPORT_SYMBOL_GPL(greybus_message_sent);
/*
* We've received data on a connection, and it doesn't look like a
* response, so we assume it's a request.
*
* This is called in interrupt context, so just copy the incoming
* data into the request buffer and handle the rest via workqueue.
*/
static void gb_connection_recv_request(struct gb_connection *connection,
const struct gb_operation_msg_hdr *header,
void *data, size_t size)
{
struct gb_operation *operation;
u16 operation_id;
u8 type;
int ret;
operation_id = le16_to_cpu(header->operation_id);
type = header->type;
operation = gb_operation_create_incoming(connection, operation_id,
type, data, size);
if (!operation) {
dev_err(&connection->hd->dev,
"%s: can't create incoming operation\n",
connection->name);
return;
}
ret = gb_operation_get_active(operation);
if (ret) {
gb_operation_put(operation);
return;
}
trace_gb_message_recv_request(operation->request);
/*
* The initial reference to the operation will be dropped when the
* request handler returns.
*/
if (gb_operation_result_set(operation, -EINPROGRESS))
queue_work(connection->wq, &operation->work);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Elder | 70 | 49.65% | 11 | 52.38% |
| Johan Hovold | 62 | 43.97% | 7 | 33.33% |
| Bryan O'Donoghue | 7 | 4.96% | 1 | 4.76% |
| Greg Kroah-Hartman | 2 | 1.42% | 2 | 9.52% |
| Total | 141 | 100.00% | 21 | 100.00% |
/*
* We've received data that appears to be an operation response
* message. Look up the operation, and record that we've received
* its response.
*
* This is called in interrupt context, so just copy the incoming
* data into the response buffer and handle the rest via workqueue.
*/
static void gb_connection_recv_response(struct gb_connection *connection,
const struct gb_operation_msg_hdr *header,
void *data, size_t size)
{
struct gb_operation *operation;
struct gb_message *message;
size_t message_size;
u16 operation_id;
int errno;
operation_id = le16_to_cpu(header->operation_id);
if (!operation_id) {
dev_err_ratelimited(&connection->hd->dev,
"%s: invalid response id 0 received\n",
connection->name);
return;
}
operation = gb_operation_find_outgoing(connection, operation_id);
if (!operation) {
dev_err_ratelimited(&connection->hd->dev,
"%s: unexpected response id 0x%04x received\n",
connection->name, operation_id);
return;
}
errno = gb_operation_status_map(header->result);
message = operation->response;
message_size = sizeof(*header) + message->payload_size;
if (!errno && size > message_size) {
dev_err_ratelimited(&connection->hd->dev,
"%s: malformed response 0x%02x received (%zu > %zu)\n",
connection->name, header->type,
size, message_size);
errno = -EMSGSIZE;
} else if (!errno && size < message_size) {
if (gb_operation_short_response_allowed(operation)) {
message->payload_size = size - sizeof(*header);
} else {
dev_err_ratelimited(&connection->hd->dev,
"%s: short response 0x%02x received (%zu < %zu)\n",
connection->name, header->type,
size, message_size);
errno = -EMSGSIZE;
}
}
/* We must ignore the payload if a bad status is returned */
if (errno)
size = sizeof(*header);
/* The rest will be handled in work queue context */
if (gb_operation_result_set(operation, errno)) {
memcpy(message->buffer, data, size);
trace_gb_message_recv_response(message);
queue_work(gb_operation_completion_wq, &operation->work);
}
gb_operation_put(operation);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Johan Hovold | 165 | 55.18% | 12 | 37.50% |
| Alex Elder | 120 | 40.13% | 15 | 46.88% |
| Viresh Kumar | 8 | 2.68% | 3 | 9.38% |
| Eli Sennesh | 4 | 1.34% | 1 | 3.12% |
| Greg Kroah-Hartman | 2 | 0.67% | 1 | 3.12% |
| Total | 299 | 100.00% | 32 | 100.00% |
/*
* Handle data arriving on a connection. As soon as we return the
* supplied data buffer will be reused (so unless we do something
* with, it's effectively dropped).
*/
void gb_connection_recv(struct gb_connection *connection,
void *data, size_t size)
{
struct gb_operation_msg_hdr header;
struct device *dev = &connection->hd->dev;
size_t msg_size;
if (connection->state == GB_CONNECTION_STATE_DISABLED ||
gb_connection_is_offloaded(connection)) {
dev_warn_ratelimited(dev, "%s: dropping %zu received bytes\n",
connection->name, size);
return;
}
if (size < sizeof(header)) {
dev_err_ratelimited(dev, "%s: short message received\n",
connection->name);
return;
}
/* Use memcpy as data may be unaligned */
memcpy(&header, data, sizeof(header));
msg_size = le16_to_cpu(header.size);
if (size < msg_size) {
dev_err_ratelimited(dev,
"%s: incomplete message 0x%04x of type 0x%02x received (%zu < %zu)\n",
connection->name,
le16_to_cpu(header.operation_id),
header.type, size, msg_size);
return; /* XXX Should still complete operation */
}
if (header.type & GB_MESSAGE_TYPE_RESPONSE) {
gb_connection_recv_response(connection, &header, data,
msg_size);
} else {
gb_connection_recv_request(connection, &header, data,
msg_size);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Elder | 108 | 58.70% | 6 | 33.33% |
| Johan Hovold | 61 | 33.15% | 9 | 50.00% |
| Greg Kroah-Hartman | 11 | 5.98% | 1 | 5.56% |
| Eli Sennesh | 3 | 1.63% | 1 | 5.56% |
| Viresh Kumar | 1 | 0.54% | 1 | 5.56% |
| Total | 184 | 100.00% | 18 | 100.00% |
/*
* Cancel an outgoing operation synchronously, and record the given error to
* indicate why.
*/
void gb_operation_cancel(struct gb_operation *operation, int errno)
{
if (WARN_ON(gb_operation_is_incoming(operation)))
return;
if (gb_operation_result_set(operation, errno)) {
gb_message_cancel(operation->request);
queue_work(gb_operation_completion_wq, &operation->work);
}
trace_gb_message_cancel_outgoing(operation->request);
atomic_inc(&operation->waiters);
wait_event(gb_operation_cancellation_queue,
!gb_operation_is_active(operation));
atomic_dec(&operation->waiters);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Johan Hovold | 59 | 68.60% | 5 | 50.00% |
| Alex Elder | 20 | 23.26% | 4 | 40.00% |
| Bryan O'Donoghue | 7 | 8.14% | 1 | 10.00% |
| Total | 86 | 100.00% | 10 | 100.00% |
EXPORT_SYMBOL_GPL(gb_operation_cancel);
/*
* Cancel an incoming operation synchronously. Called during connection tear
* down.
*/
void gb_operation_cancel_incoming(struct gb_operation *operation, int errno)
{
if (WARN_ON(!gb_operation_is_incoming(operation)))
return;
if (!gb_operation_is_unidirectional(operation)) {
/*
* Make sure the request handler has submitted the response
* before cancelling it.
*/
flush_work(&operation->work);
if (!gb_operation_result_set(operation, errno))
gb_message_cancel(operation->response);
}
trace_gb_message_cancel_incoming(operation->response);
atomic_inc(&operation->waiters);
wait_event(gb_operation_cancellation_queue,
!gb_operation_is_active(operation));
atomic_dec(&operation->waiters);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Johan Hovold | 80 | 84.21% | 6 | 60.00% |
| Bryan O'Donoghue | 7 | 7.37% | 1 | 10.00% |
| Perry Hung | 4 | 4.21% | 1 | 10.00% |
| Alex Elder | 4 | 4.21% | 2 | 20.00% |
| Total | 95 | 100.00% | 10 | 100.00% |
/**
* gb_operation_sync_timeout() - implement a "simple" synchronous operation
* @connection: the Greybus connection to send this to
* @type: the type of operation to send
* @request: pointer to a memory buffer to copy the request from
* @request_size: size of @request
* @response: pointer to a memory buffer to copy the response to
* @response_size: the size of @response.
* @timeout: operation timeout in milliseconds
*
* This function implements a simple synchronous Greybus operation. It sends
* the provided operation request and waits (sleeps) until the corresponding
* operation response message has been successfully received, or an error
* occurs. @request and @response are buffers to hold the request and response
* data respectively, and if they are not NULL, their size must be specified in
* @request_size and @response_size.
*
* If a response payload is to come back, and @response is not NULL,
* @response_size number of bytes will be copied into @response if the operation
* is successful.
*
* If there is an error, the response buffer is left alone.
*/
int gb_operation_sync_timeout(struct gb_connection *connection, int type,
void *request, int request_size,
void *response, int response_size,
unsigned int timeout)
{
struct gb_operation *operation;
int ret;
if ((response_size && !response) ||
(request_size && !request))
return -EINVAL;
operation = gb_operation_create(connection, type,
request_size, response_size,
GFP_KERNEL);
if (!operation)
return -ENOMEM;
if (request_size)
memcpy(operation->request->payload, request, request_size);
ret = gb_operation_request_send_sync_timeout(operation, timeout);
if (ret) {
dev_err(&connection->hd->dev,
"%s: synchronous operation id 0x%04x of type 0x%02x failed: %d\n",
connection->name, operation->id, type, ret);
} else {
if (response_size) {
memcpy(response, operation->response->payload,
response_size);
}
}
gb_operation_put(operation);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Greg Kroah-Hartman | 133 | 78.70% | 2 | 20.00% |
| Johan Hovold | 28 | 16.57% | 5 | 50.00% |
| David Lin | 5 | 2.96% | 1 | 10.00% |
| Viresh Kumar | 3 | 1.78% | 2 | 20.00% |
| Total | 169 | 100.00% | 10 | 100.00% |
EXPORT_SYMBOL_GPL(gb_operation_sync_timeout);
/**
* gb_operation_unidirectional_timeout() - initiate a unidirectional operation
* @connection: connection to use
* @type: type of operation to send
* @request: memory buffer to copy the request from
* @request_size: size of @request
* @timeout: send timeout in milliseconds
*
* Initiate a unidirectional operation by sending a request message and
* waiting for it to be acknowledged as sent by the host device.
*
* Note that successful send of a unidirectional operation does not imply that
* the request as actually reached the remote end of the connection.
*/
int gb_operation_unidirectional_timeout(struct gb_connection *connection,
int type, void *request, int request_size,
unsigned int timeout)
{
struct gb_operation *operation;
int ret;
if (request_size && !request)
return -EINVAL;
operation = gb_operation_create_flags(connection, type,
request_size, 0,
GB_OPERATION_FLAG_UNIDIRECTIONAL,
GFP_KERNEL);
if (!operation)
return -ENOMEM;
if (request_size)
memcpy(operation->request->payload, request, request_size);
ret = gb_operation_request_send_sync_timeout(operation, timeout);
if (ret) {
dev_err(&connection->hd->dev,
"%s: unidirectional operation of type 0x%02x failed: %d\n",
connection->name, type, ret);
}
gb_operation_put(operation);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Johan Hovold | 129 | 100.00% | 1 | 100.00% |
| Total | 129 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL_GPL(gb_operation_unidirectional_timeout);
int __init gb_operation_init(void)
{
gb_message_cache = kmem_cache_create("gb_message_cache",
sizeof(struct gb_message), 0, 0, NULL);
if (!gb_message_cache)
return -ENOMEM;
gb_operation_cache = kmem_cache_create("gb_operation_cache",
sizeof(struct gb_operation), 0, 0, NULL);
if (!gb_operation_cache)
goto err_destroy_message_cache;
gb_operation_completion_wq = alloc_workqueue("greybus_completion",
0, 0);
if (!gb_operation_completion_wq)
goto err_destroy_operation_cache;
return 0;
err_destroy_operation_cache:
kmem_cache_destroy(gb_operation_cache);
gb_operation_cache = NULL;
err_destroy_message_cache:
kmem_cache_destroy(gb_message_cache);
gb_message_cache = NULL;
return -ENOMEM;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Elder | 71 | 63.96% | 4 | 66.67% |
| Johan Hovold | 40 | 36.04% | 2 | 33.33% |
| Total | 111 | 100.00% | 6 | 100.00% |
void gb_operation_exit(void)
{
destroy_workqueue(gb_operation_completion_wq);
gb_operation_completion_wq = NULL;
kmem_cache_destroy(gb_operation_cache);
gb_operation_cache = NULL;
kmem_cache_destroy(gb_message_cache);
gb_message_cache = NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Elder | 20 | 58.82% | 4 | 57.14% |
| Johan Hovold | 11 | 32.35% | 2 | 28.57% |
| Viresh Kumar | 3 | 8.82% | 1 | 14.29% |
| Total | 34 | 100.00% | 7 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Elder | 2085 | 50.80% | 77 | 46.39% |
| Johan Hovold | 1771 | 43.15% | 72 | 43.37% |
| Greg Kroah-Hartman | 172 | 4.19% | 6 | 3.61% |
| Bryan O'Donoghue | 29 | 0.71% | 1 | 0.60% |
| Viresh Kumar | 28 | 0.68% | 6 | 3.61% |
| Perry Hung | 7 | 0.17% | 2 | 1.20% |
| Eli Sennesh | 7 | 0.17% | 1 | 0.60% |
| David Lin | 5 | 0.12% | 1 | 0.60% |
| Total | 4104 | 100.00% | 166 | 100.00% |
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