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85f87cf491
Its latest version merged from: ^/vendor/processor-trace/892e12c5a27bda5806d1e63269986bb4171b5a8b Sponsored by: DARPA, AFRL
143 lines
4.5 KiB
C
143 lines
4.5 KiB
C
/*
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* Copyright (c) 2013-2019, Intel Corporation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef PT_EVENT_QUEUE_H
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#define PT_EVENT_QUEUE_H
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#include "intel-pt.h"
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#include <stdint.h>
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/* Events are grouped by the packet the event binds to. */
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enum pt_event_binding {
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evb_psbend,
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evb_tip,
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evb_fup,
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evb_max
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};
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enum {
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/* The maximal number of pending events - should be a power of two. */
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evq_max = 8
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};
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/* A queue of events. */
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struct pt_event_queue {
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/* A collection of event queues, one per binding. */
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struct pt_event queue[evb_max][evq_max];
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/* The begin and end indices for the above event queues. */
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uint8_t begin[evb_max];
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uint8_t end[evb_max];
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/* A standalone event to be published immediately. */
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struct pt_event standalone;
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};
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/* Initialize (or reset) an event queue. */
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extern void pt_evq_init(struct pt_event_queue *);
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/* Get a standalone event.
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*
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* Returns a pointer to the standalone event on success.
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* Returns NULL if @evq is NULL.
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*/
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extern struct pt_event *pt_evq_standalone(struct pt_event_queue *evq);
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/* Enqueue an event.
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*
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* Adds a new event to @evq for binding @evb.
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*
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* Returns a pointer to the new event on success.
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* Returns NULL if @evq is NULL or @evb is invalid.
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* Returns NULL if @evq is full.
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*/
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extern struct pt_event *pt_evq_enqueue(struct pt_event_queue *evq,
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enum pt_event_binding evb);
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/* Dequeue an event.
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*
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* Removes the first event for binding @evb from @evq.
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*
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* Returns a pointer to the dequeued event on success.
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* Returns NULL if @evq is NULL or @evb is invalid.
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* Returns NULL if @evq is empty.
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*/
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extern struct pt_event *pt_evq_dequeue(struct pt_event_queue *evq,
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enum pt_event_binding evb);
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/* Clear a queue and discard events.
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*
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* Removes all events for binding @evb from @evq.
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*
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* Returns zero on success, a negative error code otherwise.
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* Returns -pte_internal if @evq is NULL or @evb is invalid.
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*/
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extern int pt_evq_clear(struct pt_event_queue *evq,
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enum pt_event_binding evb);
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/* Check for emptiness.
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*
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* Check if @evq for binding @evb is empty.
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*
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* Returns a positive number if @evq is empty.
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* Returns zero if @evq is not empty.
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* Returns -pte_internal if @evq is NULL or @evb is invalid.
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*/
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extern int pt_evq_empty(const struct pt_event_queue *evq,
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enum pt_event_binding evb);
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/* Check for non-emptiness.
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*
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* Check if @evq for binding @evb contains pending events.
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*
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* Returns a positive number if @evq is not empty.
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* Returns zero if @evq is empty.
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* Returns -pte_internal if @evq is NULL or @evb is invalid.
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*/
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extern int pt_evq_pending(const struct pt_event_queue *evq,
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enum pt_event_binding evb);
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/* Find an event by type.
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*
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* Searches @evq for binding @evb for an event of type @evt.
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*
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* Returns a pointer to the first matching event on success.
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* Returns NULL if there is no such event.
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* Returns NULL if @evq is NULL.
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* Returns NULL if @evb or @evt is invalid.
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*/
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extern struct pt_event *pt_evq_find(struct pt_event_queue *evq,
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enum pt_event_binding evb,
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enum pt_event_type evt);
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#endif /* PT_EVENT_QUEUE_H */
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