mirror of https://gitee.com/openkylin/linux.git
greybus: loopback: Add asynchronous bi-directional support
A particular ask from the firmware people for some time now has been the ability to drive multiple outstanding bi-directional operations from loopback to loopback Interfaces. This patch implments that change. The approach taken is to make a call to gb_operation_send() and have loopback capture the completion callback itself, with a parallel timer to timeout completion callbacks that take too long. The calling thread will issue each gb_operation_send() as fast as it can within the constraints of thread-safety. In order to support this addition the following new sysfs entries are created on a per-connection basis. - async Zero indicates loopback should use the traditional synchronous model i.e. gb_operation_request_send_sync(). Non-zero indicates loopback should use the new asynchronous model i.e. gb_operation_send() - requests_completed This value indicates the number of requests successfully completed. - requests_timedout This value indicates the number of requests which timed out. - timeout The number of microseconds to give an individual asynchronous request before timing that request out. - timeout_min Read-only attribute informs user-space of the minimum allowed timeout. - timeout_max Read-only attribute informs user-space of the maximum allowed timeout. Note requests_completed + requests_timedout should always equal iteration_max, once iteration_count == iteration_max. Also, at this time we support either synchronous or asynchronous operations in one set of transactions. Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Bryan O'Donoghue
Greg Kroah-Hartman
parent
2e238d71ed
commit
12927835d2
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@ -20,6 +20,7 @@
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#include <linux/debugfs.h>
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#include <linux/list_sort.h>
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#include <linux/spinlock.h>
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#include <linux/workqueue.h>
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#include <asm/div64.h>
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@ -43,10 +44,24 @@ struct gb_loopback_device {
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/* We need to take a lock in atomic context */
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spinlock_t lock;
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struct list_head list;
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struct list_head list_op_async;
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wait_queue_head_t wq;
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};
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static struct gb_loopback_device gb_dev;
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struct gb_loopback_async_operation {
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struct gb_loopback *gb;
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struct gb_operation *operation;
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struct timeval ts;
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struct timer_list timer;
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struct list_head entry;
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struct work_struct work;
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struct kref kref;
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bool pending;
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int (*completion)(struct gb_loopback_async_operation *op_async);
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};
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struct gb_loopback {
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struct gb_connection *connection;
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@ -66,18 +81,29 @@ struct gb_loopback {
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struct gb_loopback_stats gpbridge_firmware_latency;
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int type;
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int async;
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u32 mask;
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u32 size;
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u32 iteration_max;
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u32 iteration_count;
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int ms_wait;
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u32 error;
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u32 requests_completed;
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u32 requests_timedout;
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u32 timeout;
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u32 jiffy_timeout;
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u32 timeout_min;
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u32 timeout_max;
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u32 lbid;
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u64 elapsed_nsecs;
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u32 apbridge_latency_ts;
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u32 gpbridge_latency_ts;
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};
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/* Min/max values in jiffies */
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#define GB_LOOPBACK_TIMEOUT_MIN 1
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#define GB_LOOPBACK_TIMEOUT_MAX 10000
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#define GB_LOOPBACK_FIFO_DEFAULT 8192
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static unsigned kfifo_depth = GB_LOOPBACK_FIFO_DEFAULT;
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@ -215,6 +241,8 @@ static void gb_loopback_check_attr(struct gb_loopback *gb,
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gb->ms_wait = GB_LOOPBACK_MS_WAIT_MAX;
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if (gb->size > gb_dev.size_max)
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gb->size = gb_dev.size_max;
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gb->requests_timedout = 0;
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gb->requests_completed = 0;
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gb->iteration_count = 0;
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gb->error = 0;
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@ -230,6 +258,11 @@ static void gb_loopback_check_attr(struct gb_loopback *gb,
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case GB_LOOPBACK_TYPE_PING:
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case GB_LOOPBACK_TYPE_TRANSFER:
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case GB_LOOPBACK_TYPE_SINK:
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gb->jiffy_timeout = usecs_to_jiffies(gb->timeout);
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if (!gb->jiffy_timeout)
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gb->jiffy_timeout = GB_LOOPBACK_TIMEOUT_MIN;
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else if (gb->jiffy_timeout > GB_LOOPBACK_TIMEOUT_MAX)
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gb->jiffy_timeout = GB_LOOPBACK_TIMEOUT_MAX;
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gb_loopback_reset_stats(gb);
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wake_up(&gb->wq);
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break;
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@ -252,6 +285,14 @@ gb_loopback_stats_attrs(gpbridge_firmware_latency);
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/* Number of errors encountered during loop */
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gb_loopback_ro_attr(error);
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/* Number of requests successfully completed async */
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gb_loopback_ro_attr(requests_completed);
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/* Number of requests timed out async */
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gb_loopback_ro_attr(requests_timedout);
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/* Timeout minimum in useconds */
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gb_loopback_ro_attr(timeout_min);
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/* Timeout minimum in useconds */
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gb_loopback_ro_attr(timeout_max);
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/*
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* Type of loopback message to send based on protocol type definitions
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@ -270,8 +311,12 @@ gb_dev_loopback_rw_attr(ms_wait, d);
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gb_dev_loopback_rw_attr(iteration_max, u);
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/* The current index of the for (i = 0; i < iteration_max; i++) loop */
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gb_dev_loopback_ro_attr(iteration_count, false);
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/* A bit-mask of destination connecitons to include in the test run */
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/* A bit-mask of destination connections to include in the test run */
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gb_dev_loopback_rw_attr(mask, u);
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/* A flag to indicate synchronous or asynchronous operations */
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gb_dev_loopback_rw_attr(async, u);
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/* Timeout of an individual asynchronous request */
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gb_dev_loopback_rw_attr(timeout, u);
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static struct attribute *loopback_attrs[] = {
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&dev_attr_latency_min.attr,
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@ -295,11 +340,19 @@ static struct attribute *loopback_attrs[] = {
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&dev_attr_iteration_count.attr,
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&dev_attr_iteration_max.attr,
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&dev_attr_mask.attr,
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&dev_attr_async.attr,
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&dev_attr_error.attr,
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&dev_attr_requests_completed.attr,
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&dev_attr_requests_timedout.attr,
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&dev_attr_timeout.attr,
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&dev_attr_timeout_min.attr,
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&dev_attr_timeout_max.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(loopback);
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static void gb_loopback_calculate_stats(struct gb_loopback *gb);
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static u32 gb_loopback_nsec_to_usec_latency(u64 elapsed_nsecs)
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{
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u32 lat;
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@ -381,7 +434,200 @@ static int gb_loopback_operation_sync(struct gb_loopback *gb, int type,
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return ret;
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}
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static int gb_loopback_sink(struct gb_loopback *gb, u32 len)
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static void __gb_loopback_async_operation_destroy(struct kref *kref)
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{
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struct gb_loopback_async_operation *op_async;
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op_async = container_of(kref, struct gb_loopback_async_operation, kref);
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list_del(&op_async->entry);
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if (op_async->operation)
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gb_operation_put(op_async->operation);
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kfree(op_async);
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}
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static void gb_loopback_async_operation_get(struct gb_loopback_async_operation
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*op_async)
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{
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kref_get(&op_async->kref);
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}
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static void gb_loopback_async_operation_put(struct gb_loopback_async_operation
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*op_async)
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{
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unsigned long flags;
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spin_lock_irqsave(&gb_dev.lock, flags);
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kref_put(&op_async->kref, __gb_loopback_async_operation_destroy);
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spin_unlock_irqrestore(&gb_dev.lock, flags);
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}
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static struct gb_loopback_async_operation *
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gb_loopback_operation_find(u16 id)
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{
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struct gb_loopback_async_operation *op_async;
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bool found = false;
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unsigned long flags;
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spin_lock_irqsave(&gb_dev.lock, flags);
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list_for_each_entry(op_async, &gb_dev.list_op_async, entry) {
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if (op_async->operation->id == id) {
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gb_loopback_async_operation_get(op_async);
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found = true;
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break;
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}
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}
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spin_unlock_irqrestore(&gb_dev.lock, flags);
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return found ? op_async : NULL;
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}
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static void gb_loopback_async_operation_callback(struct gb_operation *operation)
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{
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struct gb_loopback_async_operation *op_async;
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struct gb_loopback *gb;
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struct timeval te;
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bool err = false;
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do_gettimeofday(&te);
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op_async = gb_loopback_operation_find(operation->id);
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if (!op_async)
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return;
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gb = op_async->gb;
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mutex_lock(&gb->mutex);
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if (!op_async->pending || gb_operation_result(operation)) {
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err = true;
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} else {
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if (op_async->completion)
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if (op_async->completion(op_async))
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err = true;
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}
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if (err) {
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gb->error++;
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} else {
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gb->requests_completed++;
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gb_loopback_push_latency_ts(gb, &op_async->ts, &te);
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gb->elapsed_nsecs = gb_loopback_calc_latency(&op_async->ts,
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&te);
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gb_loopback_calculate_stats(gb);
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}
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if (op_async->pending) {
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gb->iteration_count++;
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op_async->pending = false;
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del_timer_sync(&op_async->timer);
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gb_loopback_async_operation_put(op_async);
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}
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mutex_unlock(&gb->mutex);
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dev_dbg(&gb->connection->bundle->dev, "complete operation %d\n",
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operation->id);
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gb_loopback_async_operation_put(op_async);
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}
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static void gb_loopback_async_operation_work(struct work_struct *work)
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{
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struct gb_loopback *gb;
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struct gb_operation *operation;
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struct gb_loopback_async_operation *op_async;
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op_async = container_of(work, struct gb_loopback_async_operation, work);
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if (!op_async)
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return;
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gb = op_async->gb;
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operation = op_async->operation;
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mutex_lock(&gb->mutex);
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if (op_async->pending) {
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gb->requests_timedout++;
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gb->error++;
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gb->iteration_count++;
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op_async->pending = false;
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gb_loopback_async_operation_put(op_async);
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}
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mutex_unlock(&gb->mutex);
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dev_dbg(&gb->connection->bundle->dev, "timeout operation %d\n",
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operation->id);
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gb_operation_cancel(operation, -ETIMEDOUT);
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gb_loopback_async_operation_put(op_async);
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}
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static void gb_loopback_async_operation_timeout(unsigned long data)
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{
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struct gb_loopback_async_operation *op_async;
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u16 id = data;
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op_async = gb_loopback_operation_find(id);
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if (!op_async) {
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pr_err("operation %d not found - time out ?\n", id);
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return;
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}
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schedule_work(&op_async->work);
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}
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static int gb_loopback_async_operation(struct gb_loopback *gb, int type,
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void *request, int request_size,
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int response_size,
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void *completion)
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{
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struct gb_loopback_async_operation *op_async;
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struct gb_operation *operation;
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int ret;
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unsigned long flags;
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op_async = kzalloc(sizeof(*op_async), GFP_KERNEL);
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if (!op_async)
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return -ENOMEM;
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INIT_WORK(&op_async->work, gb_loopback_async_operation_work);
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init_timer(&op_async->timer);
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kref_init(&op_async->kref);
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operation = gb_operation_create(gb->connection, type, request_size,
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response_size, GFP_KERNEL);
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if (!operation) {
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ret = -ENOMEM;
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goto error;
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}
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if (request_size)
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memcpy(operation->request->payload, request, request_size);
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op_async->gb = gb;
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op_async->operation = operation;
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op_async->completion = completion;
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spin_lock_irqsave(&gb_dev.lock, flags);
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list_add_tail(&op_async->entry, &gb_dev.list_op_async);
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spin_unlock_irqrestore(&gb_dev.lock, flags);
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do_gettimeofday(&op_async->ts);
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op_async->pending = true;
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ret = gb_operation_request_send(operation,
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gb_loopback_async_operation_callback,
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GFP_KERNEL);
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if (ret)
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goto error;
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op_async->timer.function = gb_loopback_async_operation_timeout;
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op_async->timer.expires = jiffies + gb->jiffy_timeout;
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op_async->timer.data = (unsigned long)operation->id;
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add_timer(&op_async->timer);
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return ret;
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error:
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gb_loopback_async_operation_put(op_async);
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return ret;
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}
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static int gb_loopback_sync_sink(struct gb_loopback *gb, u32 len)
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{
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struct gb_loopback_transfer_request *request;
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int retval;
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@ -398,7 +644,7 @@ static int gb_loopback_sink(struct gb_loopback *gb, u32 len)
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return retval;
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}
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static int gb_loopback_transfer(struct gb_loopback *gb, u32 len)
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static int gb_loopback_sync_transfer(struct gb_loopback *gb, u32 len)
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{
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struct gb_loopback_transfer_request *request;
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struct gb_loopback_transfer_response *response;
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@ -440,12 +686,91 @@ static int gb_loopback_transfer(struct gb_loopback *gb, u32 len)
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return retval;
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}
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static int gb_loopback_ping(struct gb_loopback *gb)
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static int gb_loopback_sync_ping(struct gb_loopback *gb)
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{
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return gb_loopback_operation_sync(gb, GB_LOOPBACK_TYPE_PING,
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NULL, 0, NULL, 0);
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}
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static int gb_loopback_async_sink(struct gb_loopback *gb, u32 len)
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{
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struct gb_loopback_transfer_request *request;
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int retval;
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request = kmalloc(len + sizeof(*request), GFP_KERNEL);
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if (!request)
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return -ENOMEM;
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request->len = cpu_to_le32(len);
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retval = gb_loopback_async_operation(gb, GB_LOOPBACK_TYPE_SINK,
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request, len + sizeof(*request),
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0, NULL);
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kfree(request);
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return retval;
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}
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static int gb_loopback_async_transfer_complete(
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struct gb_loopback_async_operation *op_async)
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{
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struct gb_loopback *gb;
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struct gb_operation *operation;
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struct gb_loopback_transfer_request *request;
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struct gb_loopback_transfer_response *response;
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size_t len;
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int retval = 0;
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gb = op_async->gb;
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operation = op_async->operation;
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request = operation->request->payload;
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response = operation->response->payload;
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len = le32_to_cpu(request->len);
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if (memcmp(request->data, response->data, len)) {
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dev_err(&gb->connection->bundle->dev,
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"Loopback Data doesn't match operation id %d\n",
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operation->id);
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retval = -EREMOTEIO;
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} else {
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gb->apbridge_latency_ts =
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(u32)__le32_to_cpu(response->reserved0);
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gb->gpbridge_latency_ts =
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(u32)__le32_to_cpu(response->reserved1);
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}
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return retval;
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}
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static int gb_loopback_async_transfer(struct gb_loopback *gb, u32 len)
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{
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struct gb_loopback_transfer_request *request;
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int retval, response_len;
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request = kmalloc(len + sizeof(*request), GFP_KERNEL);
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if (!request)
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return -ENOMEM;
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memset(request->data, 0x5A, len);
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request->len = cpu_to_le32(len);
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response_len = sizeof(struct gb_loopback_transfer_response);
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retval = gb_loopback_async_operation(gb, GB_LOOPBACK_TYPE_TRANSFER,
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request, len + sizeof(*request),
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len + response_len,
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gb_loopback_async_transfer_complete);
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if (retval)
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goto gb_error;
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gb_error:
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kfree(request);
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return retval;
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}
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static int gb_loopback_async_ping(struct gb_loopback *gb)
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{
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return gb_loopback_async_operation(gb, GB_LOOPBACK_TYPE_PING,
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NULL, 0, 0, NULL);
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}
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static int gb_loopback_request_recv(u8 type, struct gb_operation *operation)
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{
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struct gb_connection *connection = operation->connection;
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@ -512,6 +837,10 @@ static void gb_loopback_reset_stats(struct gb_loopback *gb)
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memcpy(&gb->gpbridge_firmware_latency, &reset,
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sizeof(struct gb_loopback_stats));
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/* Set values to report min/max timeout to user-space */
|
||||
gb->timeout_min = jiffies_to_usecs(GB_LOOPBACK_TIMEOUT_MIN);
|
||||
gb->timeout_max = jiffies_to_usecs(GB_LOOPBACK_TIMEOUT_MAX);
|
||||
|
||||
/* Reset aggregate stats */
|
||||
memcpy(&gb->latency, &reset, sizeof(struct gb_loopback_stats));
|
||||
memcpy(&gb->throughput, &reset, sizeof(struct gb_loopback_stats));
|
||||
|
|
@ -599,23 +928,25 @@ static int gb_loopback_fn(void *data)
|
|||
int ms_wait = 0;
|
||||
int type;
|
||||
u32 size;
|
||||
u32 send_count = 0;
|
||||
struct gb_loopback *gb = data;
|
||||
|
||||
while (1) {
|
||||
if (!gb->type)
|
||||
wait_event_interruptible(gb->wq, gb->type ||
|
||||
kthread_should_stop());
|
||||
|
||||
if (kthread_should_stop())
|
||||
break;
|
||||
|
||||
mutex_lock(&gb->mutex);
|
||||
|
||||
sysfs_notify(&gb->connection->bundle->dev.kobj,
|
||||
NULL, "iteration_count");
|
||||
|
||||
/* Optionally terminate */
|
||||
if (gb->iteration_count == gb->iteration_max) {
|
||||
if (send_count == gb->iteration_max) {
|
||||
gb->type = 0;
|
||||
send_count = 0;
|
||||
mutex_unlock(&gb->mutex);
|
||||
continue;
|
||||
}
|
||||
|
|
@ -625,19 +956,33 @@ static int gb_loopback_fn(void *data)
|
|||
mutex_unlock(&gb->mutex);
|
||||
|
||||
/* Else operations to perform */
|
||||
if (type == GB_LOOPBACK_TYPE_PING)
|
||||
error = gb_loopback_ping(gb);
|
||||
else if (type == GB_LOOPBACK_TYPE_TRANSFER)
|
||||
error = gb_loopback_transfer(gb, size);
|
||||
else if (type == GB_LOOPBACK_TYPE_SINK)
|
||||
error = gb_loopback_sink(gb, size);
|
||||
if (gb->async) {
|
||||
if (type == GB_LOOPBACK_TYPE_PING) {
|
||||
error = gb_loopback_async_ping(gb);
|
||||
gb_loopback_calculate_stats(gb);
|
||||
} else if (type == GB_LOOPBACK_TYPE_TRANSFER) {
|
||||
error = gb_loopback_async_transfer(gb, size);
|
||||
} else if (type == GB_LOOPBACK_TYPE_SINK) {
|
||||
error = gb_loopback_async_sink(gb, size);
|
||||
}
|
||||
|
||||
if (error)
|
||||
gb->error++;
|
||||
|
||||
gb_loopback_calculate_stats(gb);
|
||||
gb->iteration_count++;
|
||||
if (error)
|
||||
gb->error++;
|
||||
} else {
|
||||
/* We are effectively single threaded here */
|
||||
if (type == GB_LOOPBACK_TYPE_PING)
|
||||
error = gb_loopback_sync_ping(gb);
|
||||
else if (type == GB_LOOPBACK_TYPE_TRANSFER)
|
||||
error = gb_loopback_sync_transfer(gb, size);
|
||||
else if (type == GB_LOOPBACK_TYPE_SINK)
|
||||
error = gb_loopback_sync_sink(gb, size);
|
||||
|
||||
if (error)
|
||||
gb->error++;
|
||||
gb->iteration_count++;
|
||||
gb_loopback_calculate_stats(gb);
|
||||
}
|
||||
send_count++;
|
||||
if (ms_wait)
|
||||
msleep(ms_wait);
|
||||
}
|
||||
|
|
@ -742,6 +1087,10 @@ static int gb_loopback_connection_init(struct gb_connection *connection)
|
|||
init_waitqueue_head(&gb->wq);
|
||||
gb_loopback_reset_stats(gb);
|
||||
|
||||
/* Reported values to user-space for min/max timeouts */
|
||||
gb->timeout_min = jiffies_to_usecs(GB_LOOPBACK_TIMEOUT_MIN);
|
||||
gb->timeout_max = jiffies_to_usecs(GB_LOOPBACK_TIMEOUT_MAX);
|
||||
|
||||
if (!gb_dev.count) {
|
||||
/* Calculate maximum payload */
|
||||
gb_dev.size_max = gb_operation_get_payload_size_max(connection);
|
||||
|
|
@ -847,6 +1196,7 @@ static int loopback_init(void)
|
|||
int retval;
|
||||
|
||||
INIT_LIST_HEAD(&gb_dev.list);
|
||||
INIT_LIST_HEAD(&gb_dev.list_op_async);
|
||||
spin_lock_init(&gb_dev.lock);
|
||||
gb_dev.root = debugfs_create_dir("gb_loopback", NULL);
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue