[PATCH v11 25/27] selftests/powerpc: Add ptrace tests for TM SPR registers

wei.guo.simon
2016-07-17T02:04:10Z

This patch adds ptrace interface test for TM SPR registers. This
also adds ptrace interface based helper functions related to TM
SPR registers access.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Anton Blanchard <anton@samba.org>
Cc: Cyril Bur <cyrilbur@gmail.com>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Cc: Simon Guo <wei.guo.simon@gmail.com>
Cc: Ulrich Weigand <ulrich.weigand@de.ibm.com>
Cc: Michael Neuling <mikey@neuling.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Rashmica Gupta <rashmicy@gmail.com>
Cc: Khem Raj <raj.khem@gmail.com>
Cc: Jessica Yu <jeyu@redhat.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Miroslav Benes <mbenes@suse.cz>
Cc: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Cc: Chris Smart <chris@distroguy.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-kselftest@vger.kernel.org
Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Simon Guo <wei.guo.simon@gmail.com>
---
tools/testing/selftests/powerpc/ptrace/Makefile | 3 +-
.../selftests/powerpc/ptrace/ptrace-tm-spr.c | 175 +++++++++++++++++++++
tools/testing/selftests/powerpc/ptrace/ptrace.h | 35 +++++
3 files changed, 212 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/powerpc/ptrace/ptrace-tm-spr.c

diff --git a/tools/testing/selftests/powerpc/ptrace/Makefile b/tools/testing/selftests/powerpc/ptrace/Makefile
index 797840a..f34670e 100644
--- a/tools/testing/selftests/powerpc/ptrace/Makefile
+++ b/tools/testing/selftests/powerpc/ptrace/Makefile
@@ -1,7 +1,8 @@
TEST_PROGS := ptrace-ebb ptrace-gpr ptrace-tm-gpr ptrace-tm-spd-gpr \
ptrace-tar ptrace-tm-tar ptrace-tm-spd-tar ptrace-vsx ptrace-tm-vsx \
-ptrace-tm-spd-vsx
+ptrace-tm-spd-vsx ptrace-tm-spr

+include ../../lib.mk

all: $(TEST_PROGS)
CFLAGS += -m64
diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spr.c b/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spr.c
new file mode 100644
index 0000000..9d7f37d
--- /dev/null
+++ b/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spr.c
@@ -0,0 +1,175 @@
+/*
+ * Ptrace test TM SPR registers
+ *
+ * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include "ptrace.h"
+
+/* Tracee and tracer shared data */
+struct shared {
+ int flag;
+ struct tm_spr_regs regs;
+};
+unsigned long tfhar;
+
+int shm_id;
+volatile struct shared *cptr, *pptr;
+
+int shm_id1;
+volatile int *cptr1, *pptr1;
+
+#define TM_SCHED 0xde0000018c000001
+#define TM_KVM_SCHED 0xe0000001ac000001
+
+int validate_tm_spr(struct tm_spr_regs *regs)
+{
+ if (regs->tm_tfhar != (tfhar - 32))
+ return TEST_FAIL;
+
+ if ((regs->tm_texasr != TM_SCHED) && (regs->tm_texasr != TM_KVM_SCHED))
+ return TEST_FAIL;
+
+ if ((regs->tm_texasr == TM_KVM_SCHED) && (regs->tm_tfiar != 0))
+ return TEST_FAIL;
+
+ return TEST_PASS;
+}
+
+void tm_spr(void)
+{
+ unsigned long result, texasr;
+ int ret;
+
+ cptr = (struct shared *)shmat(shm_id, NULL, 0);
+ cptr1 = (int *)shmat(shm_id1, NULL, 0);
+
+trans:
+ cptr1[0] = 0;
+ asm __volatile__(
+ "1: ;"
+ TBEGIN
+ "beq 2f;"
+
+ TSUSPEND
+ "li 8, 1;"
+ "sth 8, 0(%[cptr1]);"
+ TRESUME
+ "b .;"
+
+ TEND
+ "li 0, 0;"
+ "ori %[res], 0, 0;"
+ "b 3f;"
+
+ "2: ;"
+ "mflr 31;"
+ "bl 4f;" /* $ = TFHAR + 2 */
+ "4: ;"
+ "mflr %[tfhar];"
+ "mtlr 31;"
+
+ "li 0, 1;"
+ "ori %[res], 0, 0;"
+ "mfspr %[texasr], %[sprn_texasr];"
+
+ "3: ;"
+ : [tfhar] "=r" (tfhar), [res] "=r" (result),
+ [texasr] "=r" (texasr), [cptr1] "=r" (cptr1)
+ : [sprn_texasr] "i" (SPRN_TEXASR)
+ : "memory", "r0", "r1", "r2", "r3", "r4",
+ "r8", "r9", "r10", "r11", "r31"
+ );
+
+ if (result) {
+ if (!cptr->flag)
+ goto trans;
+
+ ret = validate_tm_spr((struct tm_spr_regs *)&cptr->regs);
+ shmdt((void *)cptr);
+ shmdt((void *)cptr1);
+ if (ret)
+ exit(1);
+ exit(0);
+ }
+ shmdt((void *)cptr);
+ shmdt((void *)cptr1);
+ exit(1);
+}
+
+int trace_tm_spr(pid_t child)
+{
+ int ret;
+
+ ret = start_trace(child);
+ if (ret)
+ return TEST_FAIL;
+
+ ret = show_tm_spr(child, (struct tm_spr_regs *)&pptr->regs);
+ if (ret)
+ return TEST_FAIL;
+
+ printf("TFHAR: %lx TEXASR: %lx TFIAR: %lx\n", pptr->regs.tm_tfhar,
+ pptr->regs.tm_texasr, pptr->regs.tm_tfiar);
+
+ pptr->flag = 1;
+ ret = stop_trace(child);
+ if (ret)
+ return TEST_FAIL;
+
+ return TEST_PASS;
+}
+
+int ptrace_tm_spr(void)
+{
+ pid_t pid;
+ int ret, status;
+
+ SKIP_IF(!((long)get_auxv_entry(AT_HWCAP2) & PPC_FEATURE2_HTM));
+ shm_id = shmget(IPC_PRIVATE, sizeof(struct shared), 0777|IPC_CREAT);
+ shm_id1 = shmget(IPC_PRIVATE, sizeof(int), 0777|IPC_CREAT);
+ pid = fork();
+ if (pid < 0) {
+ perror("fork() failed");
+ return TEST_FAIL;
+ }
+
+ if (pid == 0)
+ tm_spr();
+
+ if (pid) {
+ pptr = (struct shared *)shmat(shm_id, NULL, 0);
+ pptr1 = (int *)shmat(shm_id1, NULL, 0);
+
+ while (!pptr1[0]);
+ ret = trace_tm_spr(pid);
+ if (ret) {
+ kill(pid, SIGKILL);
+ return TEST_FAIL;
+ }
+
+ shmdt((void *)pptr);
+ shmdt((void *)pptr1);
+ ret = wait(&status);
+ if (ret != pid) {
+ printf("Child's exit status not captured\n");
+ return TEST_FAIL;
+ }
+
+ if (WIFEXITED(status)) {
+ if (WEXITSTATUS(status))
+ return TEST_FAIL;
+ }
+ return TEST_PASS;
+ }
+ return TEST_PASS;
+}
+
+int main(int argc, char *argv[])
+{
+ return test_harness(ptrace_tm_spr, "ptrace_tm_spr");
+}
diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace.h b/tools/testing/selftests/powerpc/ptrace/ptrace.h
index 442a9a0..ad9fb2e 100644
--- a/tools/testing/selftests/powerpc/ptrace/ptrace.h
+++ b/tools/testing/selftests/powerpc/ptrace/ptrace.h
@@ -67,6 +67,11 @@ struct fpr_regs {
unsigned long fpscr;
};

+struct tm_spr_regs {
+ unsigned long tm_tfhar;
+ unsigned long tm_texasr;
+ unsigned long tm_tfiar;
+};

/* Basic ptrace operations */
int start_trace(pid_t child)
@@ -680,6 +685,36 @@ int write_vsx_ckpt(pid_t child, unsigned long *vsx)
return TEST_PASS;
}

+/* TM SPR */
+int show_tm_spr(pid_t child, struct tm_spr_regs *out)
+{
+ struct tm_spr_regs *regs;
+ struct iovec iov;
+ int ret;
+
+ regs = (struct tm_spr_regs *) malloc(sizeof(struct tm_spr_regs));
+ if (!regs) {
+ perror("malloc() failed");
+ return TEST_FAIL;
+ }
+
+ iov.iov_base = (u64 *) regs;
+ iov.iov_len = sizeof(struct tm_spr_regs);
+
+ ret = ptrace(PTRACE_GETREGSET, child, NT_PPC_TM_SPR, &iov);
+ if (ret) {
+ perror("ptrace(PTRACE_GETREGSET) failed");
+ return TEST_FAIL;
+ }
+
+ if (out)
+ memcpy(out, regs, sizeof(struct tm_spr_regs));
+
+ return TEST_PASS;
+}
+
+
+
/* Analyse TEXASR after TM failure */
inline unsigned long get_tfiar(void)
{
--
1.8.3.1