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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/tools/testing/selftests/powerpc/tm
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/tools/testing/selftests/powerpc/tm')
-rw-r--r--kernel/tools/testing/selftests/powerpc/tm/.gitignore2
-rw-r--r--kernel/tools/testing/selftests/powerpc/tm/Makefile13
-rw-r--r--kernel/tools/testing/selftests/powerpc/tm/tm-resched-dscr.c98
-rw-r--r--kernel/tools/testing/selftests/powerpc/tm/tm-syscall-asm.S27
-rw-r--r--kernel/tools/testing/selftests/powerpc/tm/tm-syscall.c121
5 files changed, 261 insertions, 0 deletions
diff --git a/kernel/tools/testing/selftests/powerpc/tm/.gitignore b/kernel/tools/testing/selftests/powerpc/tm/.gitignore
new file mode 100644
index 000000000..2699635d2
--- /dev/null
+++ b/kernel/tools/testing/selftests/powerpc/tm/.gitignore
@@ -0,0 +1,2 @@
+tm-resched-dscr
+tm-syscall
diff --git a/kernel/tools/testing/selftests/powerpc/tm/Makefile b/kernel/tools/testing/selftests/powerpc/tm/Makefile
new file mode 100644
index 000000000..6bff955e1
--- /dev/null
+++ b/kernel/tools/testing/selftests/powerpc/tm/Makefile
@@ -0,0 +1,13 @@
+TEST_PROGS := tm-resched-dscr
+
+all: $(TEST_PROGS)
+
+$(TEST_PROGS): ../harness.c
+
+tm-syscall: tm-syscall-asm.S
+tm-syscall: CFLAGS += -mhtm
+
+include ../../lib.mk
+
+clean:
+ rm -f $(TEST_PROGS) *.o
diff --git a/kernel/tools/testing/selftests/powerpc/tm/tm-resched-dscr.c b/kernel/tools/testing/selftests/powerpc/tm/tm-resched-dscr.c
new file mode 100644
index 000000000..42d4c8caa
--- /dev/null
+++ b/kernel/tools/testing/selftests/powerpc/tm/tm-resched-dscr.c
@@ -0,0 +1,98 @@
+/* Test context switching to see if the DSCR SPR is correctly preserved
+ * when within a transaction.
+ *
+ * Note: We assume that the DSCR has been left at the default value (0)
+ * for all CPUs.
+ *
+ * Method:
+ *
+ * Set a value into the DSCR.
+ *
+ * Start a transaction, and suspend it (*).
+ *
+ * Hard loop checking to see if the transaction has become doomed.
+ *
+ * Now that we *may* have been preempted, record the DSCR and TEXASR SPRS.
+ *
+ * If the abort was because of a context switch, check the DSCR value.
+ * Otherwise, try again.
+ *
+ * (*) If the transaction is not suspended we can't see the problem because
+ * the transaction abort handler will restore the DSCR to it's checkpointed
+ * value before we regain control.
+ */
+
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <asm/tm.h>
+
+#include "utils.h"
+
+#define TBEGIN ".long 0x7C00051D ;"
+#define TEND ".long 0x7C00055D ;"
+#define TCHECK ".long 0x7C00059C ;"
+#define TSUSPEND ".long 0x7C0005DD ;"
+#define TRESUME ".long 0x7C2005DD ;"
+#define SPRN_TEXASR 0x82
+#define SPRN_DSCR 0x03
+
+int test_body(void)
+{
+ uint64_t rv, dscr1 = 1, dscr2, texasr;
+
+ printf("Check DSCR TM context switch: ");
+ fflush(stdout);
+ for (;;) {
+ rv = 1;
+ asm __volatile__ (
+ /* set a known value into the DSCR */
+ "ld 3, %[dscr1];"
+ "mtspr %[sprn_dscr], 3;"
+
+ /* start and suspend a transaction */
+ TBEGIN
+ "beq 1f;"
+ TSUSPEND
+
+ /* hard loop until the transaction becomes doomed */
+ "2: ;"
+ TCHECK
+ "bc 4, 0, 2b;"
+
+ /* record DSCR and TEXASR */
+ "mfspr 3, %[sprn_dscr];"
+ "std 3, %[dscr2];"
+ "mfspr 3, %[sprn_texasr];"
+ "std 3, %[texasr];"
+
+ TRESUME
+ TEND
+ "li %[rv], 0;"
+ "1: ;"
+ : [rv]"=r"(rv), [dscr2]"=m"(dscr2), [texasr]"=m"(texasr)
+ : [dscr1]"m"(dscr1)
+ , [sprn_dscr]"i"(SPRN_DSCR), [sprn_texasr]"i"(SPRN_TEXASR)
+ : "memory", "r3"
+ );
+ assert(rv); /* make sure the transaction aborted */
+ if ((texasr >> 56) != TM_CAUSE_RESCHED) {
+ putchar('.');
+ fflush(stdout);
+ continue;
+ }
+ if (dscr2 != dscr1) {
+ printf(" FAIL\n");
+ return 1;
+ } else {
+ printf(" OK\n");
+ return 0;
+ }
+ }
+}
+
+int main(void)
+{
+ return test_harness(test_body, "tm_resched_dscr");
+}
diff --git a/kernel/tools/testing/selftests/powerpc/tm/tm-syscall-asm.S b/kernel/tools/testing/selftests/powerpc/tm/tm-syscall-asm.S
new file mode 100644
index 000000000..431f61ae2
--- /dev/null
+++ b/kernel/tools/testing/selftests/powerpc/tm/tm-syscall-asm.S
@@ -0,0 +1,27 @@
+#include <ppc-asm.h>
+#include <asm/unistd.h>
+
+ .text
+FUNC_START(getppid_tm_active)
+ tbegin.
+ beq 1f
+ li r0, __NR_getppid
+ sc
+ tend.
+ blr
+1:
+ li r3, -1
+ blr
+
+FUNC_START(getppid_tm_suspended)
+ tbegin.
+ beq 1f
+ li r0, __NR_getppid
+ tsuspend.
+ sc
+ tresume.
+ tend.
+ blr
+1:
+ li r3, -1
+ blr
diff --git a/kernel/tools/testing/selftests/powerpc/tm/tm-syscall.c b/kernel/tools/testing/selftests/powerpc/tm/tm-syscall.c
new file mode 100644
index 000000000..3ed8d4b25
--- /dev/null
+++ b/kernel/tools/testing/selftests/powerpc/tm/tm-syscall.c
@@ -0,0 +1,121 @@
+/*
+ * Copyright 2015, Sam Bobroff, IBM Corp.
+ * Licensed under GPLv2.
+ *
+ * Test the kernel's system call code to ensure that a system call
+ * made from within an active HTM transaction is aborted with the
+ * correct failure code.
+ * Conversely, ensure that a system call made from within a
+ * suspended transaction can succeed.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <asm/tm.h>
+#include <asm/cputable.h>
+#include <linux/auxvec.h>
+#include <sys/time.h>
+#include <stdlib.h>
+
+#include "utils.h"
+
+extern int getppid_tm_active(void);
+extern int getppid_tm_suspended(void);
+
+unsigned retries = 0;
+
+#define TEST_DURATION 10 /* seconds */
+#define TM_RETRIES 100
+
+long failure_code(void)
+{
+ return __builtin_get_texasru() >> 24;
+}
+
+bool failure_is_persistent(void)
+{
+ return (failure_code() & TM_CAUSE_PERSISTENT) == TM_CAUSE_PERSISTENT;
+}
+
+bool failure_is_syscall(void)
+{
+ return (failure_code() & TM_CAUSE_SYSCALL) == TM_CAUSE_SYSCALL;
+}
+
+pid_t getppid_tm(bool suspend)
+{
+ int i;
+ pid_t pid;
+
+ for (i = 0; i < TM_RETRIES; i++) {
+ if (suspend)
+ pid = getppid_tm_suspended();
+ else
+ pid = getppid_tm_active();
+
+ if (pid >= 0)
+ return pid;
+
+ if (failure_is_persistent()) {
+ if (failure_is_syscall())
+ return -1;
+
+ printf("Unexpected persistent transaction failure.\n");
+ printf("TEXASR 0x%016lx, TFIAR 0x%016lx.\n",
+ __builtin_get_texasr(), __builtin_get_tfiar());
+ exit(-1);
+ }
+
+ retries++;
+ }
+
+ printf("Exceeded limit of %d temporary transaction failures.\n", TM_RETRIES);
+ printf("TEXASR 0x%016lx, TFIAR 0x%016lx.\n",
+ __builtin_get_texasr(), __builtin_get_tfiar());
+
+ exit(-1);
+}
+
+int tm_syscall(void)
+{
+ unsigned count = 0;
+ struct timeval end, now;
+
+ SKIP_IF(!((long)get_auxv_entry(AT_HWCAP2) & PPC_FEATURE2_HTM));
+ setbuf(stdout, NULL);
+
+ printf("Testing transactional syscalls for %d seconds...\n", TEST_DURATION);
+
+ gettimeofday(&end, NULL);
+ now.tv_sec = TEST_DURATION;
+ now.tv_usec = 0;
+ timeradd(&end, &now, &end);
+
+ for (count = 0; timercmp(&now, &end, <); count++) {
+ /*
+ * Test a syscall within a suspended transaction and verify
+ * that it succeeds.
+ */
+ FAIL_IF(getppid_tm(true) == -1); /* Should succeed. */
+
+ /*
+ * Test a syscall within an active transaction and verify that
+ * it fails with the correct failure code.
+ */
+ FAIL_IF(getppid_tm(false) != -1); /* Should fail... */
+ FAIL_IF(!failure_is_persistent()); /* ...persistently... */
+ FAIL_IF(!failure_is_syscall()); /* ...with code syscall. */
+ gettimeofday(&now, 0);
+ }
+
+ printf("%d active and suspended transactions behaved correctly.\n", count);
+ printf("(There were %d transaction retries.)\n", retries);
+
+ return 0;
+}
+
+int main(void)
+{
+ return test_harness(tm_syscall, "tm_syscall");
+}