cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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thread-maps-share.c (2889B)


      1// SPDX-License-Identifier: GPL-2.0
      2#include "tests.h"
      3#include "machine.h"
      4#include "thread.h"
      5#include "debug.h"
      6
      7static int test__thread_maps_share(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
      8{
      9	struct machines machines;
     10	struct machine *machine;
     11
     12	/* thread group */
     13	struct thread *leader;
     14	struct thread *t1, *t2, *t3;
     15	struct maps *maps;
     16
     17	/* other process */
     18	struct thread *other, *other_leader;
     19	struct maps *other_maps;
     20
     21	/*
     22	 * This test create 2 processes abstractions (struct thread)
     23	 * with several threads and checks they properly share and
     24	 * maintain maps info (struct maps).
     25	 *
     26	 * thread group (pid: 0, tids: 0, 1, 2, 3)
     27	 * other  group (pid: 4, tids: 4, 5)
     28	*/
     29
     30	machines__init(&machines);
     31	machine = &machines.host;
     32
     33	/* create process with 4 threads */
     34	leader = machine__findnew_thread(machine, 0, 0);
     35	t1     = machine__findnew_thread(machine, 0, 1);
     36	t2     = machine__findnew_thread(machine, 0, 2);
     37	t3     = machine__findnew_thread(machine, 0, 3);
     38
     39	/* and create 1 separated process, without thread leader */
     40	other  = machine__findnew_thread(machine, 4, 5);
     41
     42	TEST_ASSERT_VAL("failed to create threads",
     43			leader && t1 && t2 && t3 && other);
     44
     45	maps = leader->maps;
     46	TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&maps->refcnt), 4);
     47
     48	/* test the maps pointer is shared */
     49	TEST_ASSERT_VAL("maps don't match", maps == t1->maps);
     50	TEST_ASSERT_VAL("maps don't match", maps == t2->maps);
     51	TEST_ASSERT_VAL("maps don't match", maps == t3->maps);
     52
     53	/*
     54	 * Verify the other leader was created by previous call.
     55	 * It should have shared maps with no change in
     56	 * refcnt.
     57	 */
     58	other_leader = machine__find_thread(machine, 4, 4);
     59	TEST_ASSERT_VAL("failed to find other leader", other_leader);
     60
     61	/*
     62	 * Ok, now that all the rbtree related operations were done,
     63	 * lets remove all of them from there so that we can do the
     64	 * refcounting tests.
     65	 */
     66	machine__remove_thread(machine, leader);
     67	machine__remove_thread(machine, t1);
     68	machine__remove_thread(machine, t2);
     69	machine__remove_thread(machine, t3);
     70	machine__remove_thread(machine, other);
     71	machine__remove_thread(machine, other_leader);
     72
     73	other_maps = other->maps;
     74	TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&other_maps->refcnt), 2);
     75
     76	TEST_ASSERT_VAL("maps don't match", other_maps == other_leader->maps);
     77
     78	/* release thread group */
     79	thread__put(leader);
     80	TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&maps->refcnt), 3);
     81
     82	thread__put(t1);
     83	TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&maps->refcnt), 2);
     84
     85	thread__put(t2);
     86	TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&maps->refcnt), 1);
     87
     88	thread__put(t3);
     89
     90	/* release other group  */
     91	thread__put(other_leader);
     92	TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&other_maps->refcnt), 1);
     93
     94	thread__put(other);
     95
     96	machines__exit(&machines);
     97	return 0;
     98}
     99
    100DEFINE_SUITE("Share thread maps", thread_maps_share);