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authorRashmica Gupta <rashmicy@gmail.com>2015-12-23 16:49:53 +1100
committerMichael Ellerman <mpe@ellerman.id.au>2016-05-11 21:54:13 +1000
commitdbccb4940c9c9c8c93fcf733445e96dd2d6890d6 (patch)
tree3efda272d5952dcb55dcff71e3f7d8a497076fee /tools/testing/selftests/powerpc/tm
parentd95be4ca3e457044be55c8b1c1b5ac64f17d8a92 (diff)
selftests/powerpc: Add TM test to check if TAR is corrupted
If the transaction is aborted, the TAR should be rolled back to the checkpointed value before the transaction began. The value written to the TAR when the transaction is suspended should only remain there if the transaction completes successfully. Signed-off-by: Rashmica Gupta <rashmicy@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'tools/testing/selftests/powerpc/tm')
-rw-r--r--tools/testing/selftests/powerpc/tm/.gitignore1
-rw-r--r--tools/testing/selftests/powerpc/tm/Makefile2
-rw-r--r--tools/testing/selftests/powerpc/tm/tm-tar.c90
3 files changed, 92 insertions, 1 deletions
diff --git a/tools/testing/selftests/powerpc/tm/.gitignore b/tools/testing/selftests/powerpc/tm/.gitignore
index d216eddcd493..2ac376410c70 100644
--- a/tools/testing/selftests/powerpc/tm/.gitignore
+++ b/tools/testing/selftests/powerpc/tm/.gitignore
@@ -4,3 +4,4 @@ tm-signal-msr-resv
tm-signal-stack
tm-vmxcopy
tm-fork
+tm-tar
diff --git a/tools/testing/selftests/powerpc/tm/Makefile b/tools/testing/selftests/powerpc/tm/Makefile
index 2db475b12720..cb4b3bf57a4d 100644
--- a/tools/testing/selftests/powerpc/tm/Makefile
+++ b/tools/testing/selftests/powerpc/tm/Makefile
@@ -1,4 +1,4 @@
-TEST_PROGS := tm-resched-dscr tm-syscall tm-signal-msr-resv tm-signal-stack tm-vmxcopy tm-fork
+TEST_PROGS := tm-resched-dscr tm-syscall tm-signal-msr-resv tm-signal-stack tm-vmxcopy tm-fork tm-tar
all: $(TEST_PROGS)
diff --git a/tools/testing/selftests/powerpc/tm/tm-tar.c b/tools/testing/selftests/powerpc/tm/tm-tar.c
new file mode 100644
index 000000000000..2d2fcc2b7a60
--- /dev/null
+++ b/tools/testing/selftests/powerpc/tm/tm-tar.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright 2015, Michael Neuling, IBM Corp.
+ * Licensed under GPLv2.
+ * Original: Michael Neuling 19/7/2013
+ * Edited: Rashmica Gupta 01/12/2015
+ *
+ * Do some transactions, see if the tar is corrupted.
+ * If the transaction is aborted, the TAR should be rolled back to the
+ * checkpointed value before the transaction began. The value written to
+ * TAR in suspended mode should only remain in TAR if the transaction
+ * completes.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+#include "tm.h"
+#include "utils.h"
+
+int num_loops = 10000;
+
+int test_tar(void)
+{
+ int i;
+
+ SKIP_IF(!have_htm());
+
+ for (i = 0; i < num_loops; i++)
+ {
+ uint64_t result = 0;
+ asm __volatile__(
+ "li 7, 1;"
+ "mtspr %[tar], 7;" /* tar = 1 */
+ "tbegin.;"
+ "beq 3f;"
+ "li 4, 0x7000;" /* Loop lots, to use time */
+ "2:;" /* Start loop */
+ "li 7, 2;"
+ "mtspr %[tar], 7;" /* tar = 2 */
+ "tsuspend.;"
+ "li 7, 3;"
+ "mtspr %[tar], 7;" /* tar = 3 */
+ "tresume.;"
+ "subi 4, 4, 1;"
+ "cmpdi 4, 0;"
+ "bne 2b;"
+ "tend.;"
+
+ /* Transaction sucess! TAR should be 3 */
+ "mfspr 7, %[tar];"
+ "ori %[res], 7, 4;" // res = 3|4 = 7
+ "b 4f;"
+
+ /* Abort handler. TAR should be rolled back to 1 */
+ "3:;"
+ "mfspr 7, %[tar];"
+ "ori %[res], 7, 8;" // res = 1|8 = 9
+ "4:;"
+
+ : [res]"=r"(result)
+ : [tar]"i"(SPRN_TAR)
+ : "memory", "r0", "r4", "r7");
+
+ /* If result is anything else other than 7 or 9, the tar
+ * value must have been corrupted. */
+ if ((result != 7) && (result != 9))
+ return 1;
+ }
+ return 0;
+}
+
+int main(int argc, char *argv[])
+{
+ /* A low number of iterations (eg 100) can cause a false pass */
+ if (argc > 1) {
+ if (strcmp(argv[1], "-h") == 0) {
+ printf("Syntax:\n\t%s [<num loops>]\n",
+ argv[0]);
+ return 1;
+ } else {
+ num_loops = atoi(argv[1]);
+ }
+ }
+
+ printf("Starting, %d loops\n", num_loops);
+
+ return test_harness(test_tar, "tm_tar");
+}