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selftests/rseq: Implement basic percpu ops mm_cid test

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Adapt to the rseq.h API changes introduced by commits
"selftests/rseq: <arch>: Template memory ordering and percpu access mode".

Build a new basic_percpu_ops_mm_cid_test to test the new "mm_cid" rseq
field.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20221122203932.231377-19-mathieu.desnoyers@efficios.com
This commit is contained in:
Mathieu Desnoyers 2022-11-22 15:39:20 -05:00 committed by Peter Zijlstra
parent 171586a6ab
commit cead720627
3 changed files with 44 additions and 8 deletions
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1
tools/testing/selftests/rseq/.gitignore vendored
View file

@ -1,5 +1,6 @@
# SPDX-License-Identifier: GPL-2.0-only
basic_percpu_ops_test
basic_percpu_ops_mm_cid_test
basic_test
basic_rseq_op_test
param_test

5
tools/testing/selftests/rseq/Makefile
View file

@ -12,7 +12,7 @@ LDLIBS += -lpthread -ldl
# still track changes to header files and depend on shared object.
OVERRIDE_TARGETS = 1
TEST_GEN_PROGS = basic_test basic_percpu_ops_test param_test \
TEST_GEN_PROGS = basic_test basic_percpu_ops_test basic_percpu_ops_mm_cid_test param_test \
param_test_benchmark param_test_compare_twice
TEST_GEN_PROGS_EXTENDED = librseq.so
@ -29,6 +29,9 @@ $(OUTPUT)/librseq.so: rseq.c rseq.h rseq-*.h
$(OUTPUT)/%: %.c $(TEST_GEN_PROGS_EXTENDED) rseq.h rseq-*.h
$(CC) $(CFLAGS) $< $(LDLIBS) -lrseq -o $@
$(OUTPUT)/basic_percpu_ops_mm_cid_test: basic_percpu_ops_test.c $(TEST_GEN_PROGS_EXTENDED) rseq.h rseq-*.h
$(CC) $(CFLAGS) -DBUILDOPT_RSEQ_PERCPU_MM_CID_ID $< $(LDLIBS) -lrseq -o $@
$(OUTPUT)/param_test_benchmark: param_test.c $(TEST_GEN_PROGS_EXTENDED) \
rseq.h rseq-*.h
$(CC) $(CFLAGS) -DBENCHMARK $< $(LDLIBS) -lrseq -o $@

46
tools/testing/selftests/rseq/basic_percpu_ops_test.c
View file

@ -12,6 +12,32 @@
#include "../kselftest.h"
#include "rseq.h"
#ifdef BUILDOPT_RSEQ_PERCPU_MM_CID
# define RSEQ_PERCPU RSEQ_PERCPU_MM_CID
static
int get_current_cpu_id(void)
{
return rseq_current_mm_cid();
}
static
bool rseq_validate_cpu_id(void)
{
return rseq_mm_cid_available();
}
#else
# define RSEQ_PERCPU RSEQ_PERCPU_CPU_ID
static
int get_current_cpu_id(void)
{
return rseq_cpu_start();
}
static
bool rseq_validate_cpu_id(void)
{
return rseq_current_cpu_raw() >= 0;
}
#endif
struct percpu_lock_entry {
intptr_t v;
} __attribute__((aligned(128)));
@ -51,9 +77,9 @@ int rseq_this_cpu_lock(struct percpu_lock *lock)
for (;;) {
int ret;
cpu = rseq_cpu_start();
ret = rseq_cmpeqv_storev(&lock->c[cpu].v,
0, 1, cpu);
cpu = get_current_cpu_id();
ret = rseq_cmpeqv_storev(RSEQ_MO_RELAXED, RSEQ_PERCPU,
&lock->c[cpu].v, 0, 1, cpu);
if (rseq_likely(!ret))
break;
/* Retry if comparison fails or rseq aborts. */
@ -141,13 +167,14 @@ void this_cpu_list_push(struct percpu_list *list,
intptr_t *targetptr, newval, expect;
int ret;
cpu = rseq_cpu_start();
cpu = get_current_cpu_id();
/* Load list->c[cpu].head with single-copy atomicity. */
expect = (intptr_t)RSEQ_READ_ONCE(list->c[cpu].head);
newval = (intptr_t)node;
targetptr = (intptr_t *)&list->c[cpu].head;
node->next = (struct percpu_list_node *)expect;
ret = rseq_cmpeqv_storev(targetptr, expect, newval, cpu);
ret = rseq_cmpeqv_storev(RSEQ_MO_RELAXED, RSEQ_PERCPU,
targetptr, expect, newval, cpu);
if (rseq_likely(!ret))
break;
/* Retry if comparison fails or rseq aborts. */
@ -170,12 +197,13 @@ struct percpu_list_node *this_cpu_list_pop(struct percpu_list *list,
long offset;
int ret, cpu;
cpu = rseq_cpu_start();
cpu = get_current_cpu_id();
targetptr = (intptr_t *)&list->c[cpu].head;
expectnot = (intptr_t)NULL;
offset = offsetof(struct percpu_list_node, next);
load = (intptr_t *)&head;
ret = rseq_cmpnev_storeoffp_load(targetptr, expectnot,
ret = rseq_cmpnev_storeoffp_load(RSEQ_MO_RELAXED, RSEQ_PERCPU,
targetptr, expectnot,
offset, load, cpu);
if (rseq_likely(!ret)) {
if (_cpu)
@ -295,6 +323,10 @@ int main(int argc, char **argv)
errno, strerror(errno));
goto error;
}
if (!rseq_validate_cpu_id()) {
fprintf(stderr, "Error: cpu id getter unavailable\n");
goto error;
}
printf("spinlock\n");
test_percpu_spinlock();
printf("percpu_list\n");