tools/testing/selftests/sync/sync_fence.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/sync/sync_fence.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/sync/sync_fence.c
Extension
.c
Size
4750 bytes
Lines
133
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

#include "sync.h"
#include "sw_sync.h"
#include "synctest.h"

int test_fence_one_timeline_wait(void)
{
	int fence, valid, ret;
	int timeline = sw_sync_timeline_create();

	valid = sw_sync_timeline_is_valid(timeline);
	ASSERT(valid, "Failure allocating timeline\n");

	fence = sw_sync_fence_create(timeline, "allocFence", 5);
	valid = sw_sync_fence_is_valid(fence);
	ASSERT(valid, "Failure allocating fence\n");

	/* Wait on fence until timeout */
	ret = sync_wait(fence, 0);
	ASSERT(ret == 0, "Failure waiting on fence until timeout\n");

	/* Advance timeline from 0 -> 1 */
	ret = sw_sync_timeline_inc(timeline, 1);
	ASSERT(ret == 0, "Failure advancing timeline\n");

	/* Wait on fence until timeout */
	ret = sync_wait(fence, 0);
	ASSERT(ret == 0, "Failure waiting on fence until timeout\n");

	/* Signal the fence */
	ret = sw_sync_timeline_inc(timeline, 4);
	ASSERT(ret == 0, "Failure signaling the fence\n");

	/* Wait successfully */
	ret = sync_wait(fence, 0);
	ASSERT(ret > 0, "Failure waiting on fence\n");

	/* Go even further, and confirm wait still succeeds */
	ret = sw_sync_timeline_inc(timeline, 10);
	ASSERT(ret == 0, "Failure going further\n");
	ret = sync_wait(fence, 0);
	ASSERT(ret > 0, "Failure waiting ahead\n");

	sw_sync_fence_destroy(fence);
	sw_sync_timeline_destroy(timeline);

	return 0;
}

int test_fence_one_timeline_merge(void)
{
	int a, b, c, d, valid;
	int timeline = sw_sync_timeline_create();

	/* create fence a,b,c and then merge them all into fence d */
	a = sw_sync_fence_create(timeline, "allocFence", 1);
	b = sw_sync_fence_create(timeline, "allocFence", 2);
	c = sw_sync_fence_create(timeline, "allocFence", 3);

	valid = sw_sync_fence_is_valid(a) &&
		sw_sync_fence_is_valid(b) &&
		sw_sync_fence_is_valid(c);
	ASSERT(valid, "Failure allocating fences\n");

	d = sync_merge("mergeFence", b, a);
	d = sync_merge("mergeFence", c, d);
	valid = sw_sync_fence_is_valid(d);
	ASSERT(valid, "Failure merging fences\n");

	/* confirm all fences have one active point (even d) */
	ASSERT(sync_fence_count_with_status(a, FENCE_STATUS_ACTIVE) == 1,
	       "a has too many active fences!\n");
	ASSERT(sync_fence_count_with_status(a, FENCE_STATUS_ACTIVE) == 1,
	       "b has too many active fences!\n");
	ASSERT(sync_fence_count_with_status(a, FENCE_STATUS_ACTIVE) == 1,
	       "c has too many active fences!\n");
	ASSERT(sync_fence_count_with_status(a, FENCE_STATUS_ACTIVE) == 1,
	       "d has too many active fences!\n");

	/* confirm that d is not signaled until the max of a,b,c */
	sw_sync_timeline_inc(timeline, 1);
	ASSERT(sync_fence_count_with_status(a, FENCE_STATUS_SIGNALED) == 1,
	       "a did not signal!\n");
	ASSERT(sync_fence_count_with_status(d, FENCE_STATUS_ACTIVE) == 1,
	       "d signaled too early!\n");

	sw_sync_timeline_inc(timeline, 1);
	ASSERT(sync_fence_count_with_status(b, FENCE_STATUS_SIGNALED) == 1,
	       "b did not signal!\n");
	ASSERT(sync_fence_count_with_status(d, FENCE_STATUS_ACTIVE) == 1,
	       "d signaled too early!\n");

Annotation

Implementation Notes