From patchwork Mon Apr 12 11:22:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ravi Bangoria X-Patchwork-Id: 419691 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 85CA2C433B4 for ; Mon, 12 Apr 2021 11:22:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5857A60FF1 for ; Mon, 12 Apr 2021 11:22:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240315AbhDLLXE (ORCPT ); Mon, 12 Apr 2021 07:23:04 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:13302 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S240287AbhDLLXE (ORCPT ); Mon, 12 Apr 2021 07:23:04 -0400 Received: from pps.filterd (m0098413.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 13CB2mrk093124; Mon, 12 Apr 2021 07:22:37 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=9yIKchFRibSLZF9D07VBaqkpGZcZyDu3+nXUmndUFsQ=; b=b0mc3T82CHksB3l9QRsW0YD12S65yHuDZ8GqF/jIu0Va2ycUhTmJqbTfgIURQhSrjMAM HgwmKrel1n4KQd8xHZUho8eAf0hxGpDcaIkkTy489I/tsjHOAGDjJXEsy8wjTHjGvTEw jUVcfKv6NKaFO1/o6H8hvkMoTLsdL6s3IawJ1rDTnGhLMbrlzf+JN03Qevdd1FQflGd/ nlVcPsOW1Ke5oJiLQ/kjDnOiCvJwpP2NwDRIZHJvUNuh1SuHNRui3TWfqWTQWiVDkld3 vfHZfFplzrNC8kT6CJ22Zo9ma55SAb3Ps5tT51y1E9Bc5IPaeTOc/igbJk/KLZNbFi1O Yg== Received: from ppma04ams.nl.ibm.com (63.31.33a9.ip4.static.sl-reverse.com [169.51.49.99]) by mx0b-001b2d01.pphosted.com with ESMTP id 37vk4h4yd5-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 12 Apr 2021 07:22:36 -0400 Received: from pps.filterd (ppma04ams.nl.ibm.com [127.0.0.1]) by ppma04ams.nl.ibm.com (8.16.0.43/8.16.0.43) with SMTP id 13CBII9s018814; Mon, 12 Apr 2021 11:22:35 GMT Received: from b06cxnps3075.portsmouth.uk.ibm.com (d06relay10.portsmouth.uk.ibm.com [9.149.109.195]) by ppma04ams.nl.ibm.com with ESMTP id 37u3n8sr5r-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 12 Apr 2021 11:22:34 +0000 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 13CBMWNX44499412 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 12 Apr 2021 11:22:32 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 77353AE057; Mon, 12 Apr 2021 11:22:32 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5FD3FAE045; Mon, 12 Apr 2021 11:22:30 +0000 (GMT) Received: from bangoria.ibmuc.com (unknown [9.199.37.145]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 12 Apr 2021 11:22:30 +0000 (GMT) From: Ravi Bangoria To: mpe@ellerman.id.au Cc: ravi.bangoria@linux.ibm.com, shuah@kernel.org, mikey@neuling.org, linuxppc-dev@lists.ozlabs.org, linux-kselftest@vger.kernel.org, dja@axtens.net Subject: [PATCH v3 4/4] powerpc/selftests: Add selftest to test concurrent perf/ptrace events Date: Mon, 12 Apr 2021 16:52:18 +0530 Message-Id: <20210412112218.128183-5-ravi.bangoria@linux.ibm.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210412112218.128183-1-ravi.bangoria@linux.ibm.com> References: <20210412112218.128183-1-ravi.bangoria@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: V8cCme_lKZbZm3EBc3CSZdOZ-lOBIm18 X-Proofpoint-GUID: V8cCme_lKZbZm3EBc3CSZdOZ-lOBIm18 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.761 definitions=2021-04-12_09:2021-04-12,2021-04-12 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 mlxscore=0 lowpriorityscore=0 priorityscore=1501 spamscore=0 suspectscore=0 bulkscore=0 mlxlogscore=999 impostorscore=0 phishscore=0 clxscore=1015 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2104120074 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org ptrace and perf watchpoints can't co-exists if their address range overlaps. See commit 29da4f91c0c1 ("powerpc/watchpoint: Don't allow concurrent perf and ptrace events") for more detail. Add selftest for the same. Sample o/p: # ./ptrace-perf-hwbreak test: ptrace-perf-hwbreak tags: git_version:powerpc-5.8-7-118-g937fa174a15d-dirty perf cpu event -> ptrace thread event (Overlapping): Ok perf cpu event -> ptrace thread event (Non-overlapping): Ok perf thread event -> ptrace same thread event (Overlapping): Ok perf thread event -> ptrace same thread event (Non-overlapping): Ok perf thread event -> ptrace other thread event: Ok ptrace thread event -> perf kernel event: Ok ptrace thread event -> perf same thread event (Overlapping): Ok ptrace thread event -> perf same thread event (Non-overlapping): Ok ptrace thread event -> perf other thread event: Ok ptrace thread event -> perf cpu event (Overlapping): Ok ptrace thread event -> perf cpu event (Non-overlapping): Ok ptrace thread event -> perf same thread & cpu event (Overlapping): Ok ptrace thread event -> perf same thread & cpu event (Non-overlapping): Ok ptrace thread event -> perf other thread & cpu event: Ok success: ptrace-perf-hwbreak Signed-off-by: Ravi Bangoria --- .../selftests/powerpc/ptrace/.gitignore | 1 + .../testing/selftests/powerpc/ptrace/Makefile | 2 +- .../powerpc/ptrace/ptrace-perf-hwbreak.c | 659 ++++++++++++++++++ 3 files changed, 661 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/powerpc/ptrace/ptrace-perf-hwbreak.c diff --git a/tools/testing/selftests/powerpc/ptrace/.gitignore b/tools/testing/selftests/powerpc/ptrace/.gitignore index 0e96150b7c7e..eb75e5360e31 100644 --- a/tools/testing/selftests/powerpc/ptrace/.gitignore +++ b/tools/testing/selftests/powerpc/ptrace/.gitignore @@ -14,3 +14,4 @@ perf-hwbreak core-pkey ptrace-pkey ptrace-syscall +ptrace-perf-hwbreak diff --git a/tools/testing/selftests/powerpc/ptrace/Makefile b/tools/testing/selftests/powerpc/ptrace/Makefile index 8d3f006c98cc..a500639da97a 100644 --- a/tools/testing/selftests/powerpc/ptrace/Makefile +++ b/tools/testing/selftests/powerpc/ptrace/Makefile @@ -2,7 +2,7 @@ TEST_GEN_PROGS := 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-spr ptrace-hwbreak ptrace-pkey core-pkey \ - perf-hwbreak ptrace-syscall + perf-hwbreak ptrace-syscall ptrace-perf-hwbreak top_srcdir = ../../../../.. include ../../lib.mk diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace-perf-hwbreak.c b/tools/testing/selftests/powerpc/ptrace/ptrace-perf-hwbreak.c new file mode 100644 index 000000000000..fad14f926b98 --- /dev/null +++ b/tools/testing/selftests/powerpc/ptrace/ptrace-perf-hwbreak.c @@ -0,0 +1,659 @@ +// SPDX-License-Identifier: GPL-2.0+ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "ptrace.h" + +char data[16]; + +/* Overlapping address range */ +volatile __u64 *ptrace_data1 = (__u64 *)&data[0]; +volatile __u64 *perf_data1 = (__u64 *)&data[4]; + +/* Non-overlapping address range */ +volatile __u64 *ptrace_data2 = (__u64 *)&data[0]; +volatile __u64 *perf_data2 = (__u64 *)&data[8]; + +static unsigned long pid_max_addr(void) +{ + FILE *fp; + char *line, *c; + char addr[100]; + size_t len = 0; + + fp = fopen("/proc/kallsyms", "r"); + if (!fp) { + printf("Failed to read /proc/kallsyms. Exiting..\n"); + exit(EXIT_FAILURE); + } + + while (getline(&line, &len, fp) != -1) { + if (!strstr(line, "pid_max") || strstr(line, "pid_max_max") || + strstr(line, "pid_max_min")) + continue; + + strncpy(addr, line, len < 100 ? len : 100); + c = strchr(addr, ' '); + *c = '\0'; + return strtoul(addr, &c, 16); + } + fclose(fp); + printf("Could not find pix_max. Exiting..\n"); + exit(EXIT_FAILURE); + return -1; +} + +static void perf_user_event_attr_set(struct perf_event_attr *attr, __u64 addr, __u64 len) +{ + memset(attr, 0, sizeof(struct perf_event_attr)); + attr->type = PERF_TYPE_BREAKPOINT; + attr->size = sizeof(struct perf_event_attr); + attr->bp_type = HW_BREAKPOINT_R; + attr->bp_addr = addr; + attr->bp_len = len; + attr->exclude_kernel = 1; + attr->exclude_hv = 1; +} + +static void perf_kernel_event_attr_set(struct perf_event_attr *attr) +{ + memset(attr, 0, sizeof(struct perf_event_attr)); + attr->type = PERF_TYPE_BREAKPOINT; + attr->size = sizeof(struct perf_event_attr); + attr->bp_type = HW_BREAKPOINT_R; + attr->bp_addr = pid_max_addr(); + attr->bp_len = sizeof(unsigned long); + attr->exclude_user = 1; + attr->exclude_hv = 1; +} + +static int perf_cpu_event_open(int cpu, __u64 addr, __u64 len) +{ + struct perf_event_attr attr; + + perf_user_event_attr_set(&attr, addr, len); + return syscall(__NR_perf_event_open, &attr, -1, cpu, -1, 0); +} + +static int perf_thread_event_open(pid_t child_pid, __u64 addr, __u64 len) +{ + struct perf_event_attr attr; + + perf_user_event_attr_set(&attr, addr, len); + return syscall(__NR_perf_event_open, &attr, child_pid, -1, -1, 0); +} + +static int perf_thread_cpu_event_open(pid_t child_pid, int cpu, __u64 addr, __u64 len) +{ + struct perf_event_attr attr; + + perf_user_event_attr_set(&attr, addr, len); + return syscall(__NR_perf_event_open, &attr, child_pid, cpu, -1, 0); +} + +static int perf_thread_kernel_event_open(pid_t child_pid) +{ + struct perf_event_attr attr; + + perf_kernel_event_attr_set(&attr); + return syscall(__NR_perf_event_open, &attr, child_pid, -1, -1, 0); +} + +static int perf_cpu_kernel_event_open(int cpu) +{ + struct perf_event_attr attr; + + perf_kernel_event_attr_set(&attr); + return syscall(__NR_perf_event_open, &attr, -1, cpu, -1, 0); +} + +static int child(void) +{ + int ret; + + ret = ptrace(PTRACE_TRACEME, 0, NULL, 0); + if (ret) { + printf("Error: PTRACE_TRACEME failed\n"); + return 0; + } + kill(getpid(), SIGUSR1); /* --> parent (SIGUSR1) */ + + return 0; +} + +static void ptrace_ppc_hw_breakpoint(struct ppc_hw_breakpoint *info, int type, + __u64 addr, int len) +{ + info->version = 1; + info->trigger_type = type; + info->condition_mode = PPC_BREAKPOINT_CONDITION_NONE; + info->addr = addr; + info->addr2 = addr + len; + info->condition_value = 0; + if (!len) + info->addr_mode = PPC_BREAKPOINT_MODE_EXACT; + else + info->addr_mode = PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE; +} + +static int ptrace_open(pid_t child_pid, __u64 wp_addr, int len) +{ + struct ppc_hw_breakpoint info; + + ptrace_ppc_hw_breakpoint(&info, PPC_BREAKPOINT_TRIGGER_RW, wp_addr, len); + return ptrace(PPC_PTRACE_SETHWDEBUG, child_pid, 0, &info); +} + +static int test1(pid_t child_pid) +{ + int perf_fd; + int ptrace_fd; + int ret = 0; + + /* Test: + * if (new per thread event by ptrace) + * if (existing cpu event by perf) + * if (addr range overlaps) + * fail; + */ + + perf_fd = perf_cpu_event_open(0, (__u64)perf_data1, sizeof(*perf_data1)); + if (perf_fd < 0) + return -1; + + ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data1, sizeof(*ptrace_data1)); + if (ptrace_fd > 0 || errno != ENOSPC) + ret = -1; + + close(perf_fd); + return ret; +} + +static int test2(pid_t child_pid) +{ + int perf_fd; + int ptrace_fd; + int ret = 0; + + /* Test: + * if (new per thread event by ptrace) + * if (existing cpu event by perf) + * if (addr range does not overlaps) + * allow; + */ + + perf_fd = perf_cpu_event_open(0, (__u64)perf_data2, sizeof(*perf_data2)); + if (perf_fd < 0) + return -1; + + ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data2, sizeof(*ptrace_data2)); + if (ptrace_fd < 0) { + ret = -1; + goto perf_close; + } + ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd); + +perf_close: + close(perf_fd); + return ret; +} + +static int test3(pid_t child_pid) +{ + int perf_fd; + int ptrace_fd; + int ret = 0; + + /* Test: + * if (new per thread event by ptrace) + * if (existing thread event by perf on the same thread) + * if (addr range overlaps) + * fail; + */ + perf_fd = perf_thread_event_open(child_pid, (__u64)perf_data1, + sizeof(*perf_data1)); + if (perf_fd < 0) + return -1; + + ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data1, sizeof(*ptrace_data1)); + if (ptrace_fd > 0 || errno != ENOSPC) + ret = -1; + + close(perf_fd); + return ret; +} + +static int test4(pid_t child_pid) +{ + int perf_fd; + int ptrace_fd; + int ret = 0; + + /* Test: + * if (new per thread event by ptrace) + * if (existing thread event by perf on the same thread) + * if (addr range does not overlaps) + * fail; + */ + perf_fd = perf_thread_event_open(child_pid, (__u64)perf_data2, + sizeof(*perf_data2)); + if (perf_fd < 0) + return -1; + + ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data2, sizeof(*ptrace_data2)); + if (ptrace_fd < 0) { + ret = -1; + goto perf_close; + } + ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd); + +perf_close: + close(perf_fd); + return ret; +} + +static int test5(pid_t child_pid) +{ + int perf_fd; + int ptrace_fd; + int cpid; + int ret = 0; + + /* Test: + * if (new per thread event by ptrace) + * if (existing thread event by perf on the different thread) + * allow; + */ + cpid = fork(); + if (!cpid) { + /* Temporary Child */ + pause(); + exit(EXIT_SUCCESS); + } + + perf_fd = perf_thread_event_open(cpid, (__u64)perf_data1, sizeof(*perf_data1)); + if (perf_fd < 0) { + ret = -1; + goto kill_child; + } + + ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data1, sizeof(*ptrace_data1)); + if (ptrace_fd < 0) { + ret = -1; + goto perf_close; + } + + ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd); +perf_close: + close(perf_fd); +kill_child: + kill(cpid, SIGINT); + return ret; +} + +static int test6(pid_t child_pid) +{ + int perf_fd; + int ptrace_fd; + int ret = 0; + + /* Test: + * if (new per thread kernel event by perf) + * if (existing thread event by ptrace on the same thread) + * allow; + * -- OR -- + * if (new per cpu kernel event by perf) + * if (existing thread event by ptrace) + * allow; + */ + ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data1, sizeof(*ptrace_data1)); + if (ptrace_fd < 0) + return -1; + + perf_fd = perf_thread_kernel_event_open(child_pid); + if (perf_fd < 0) { + ret = -1; + goto ptrace_close; + } + close(perf_fd); + + perf_fd = perf_cpu_kernel_event_open(0); + if (perf_fd < 0) { + ret = -1; + goto ptrace_close; + } + close(perf_fd); + +ptrace_close: + ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd); + return ret; +} + +static int test7(pid_t child_pid) +{ + int perf_fd; + int ptrace_fd; + int ret = 0; + + /* Test: + * if (new per thread event by perf) + * if (existing thread event by ptrace on the same thread) + * if (addr range overlaps) + * fail; + */ + ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data1, sizeof(*ptrace_data1)); + if (ptrace_fd < 0) + return -1; + + perf_fd = perf_thread_event_open(child_pid, (__u64)perf_data1, + sizeof(*perf_data1)); + if (perf_fd > 0 || errno != ENOSPC) + ret = -1; + + ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd); + return ret; +} + +static int test8(pid_t child_pid) +{ + int perf_fd; + int ptrace_fd; + int ret = 0; + + /* Test: + * if (new per thread event by perf) + * if (existing thread event by ptrace on the same thread) + * if (addr range does not overlaps) + * allow; + */ + ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data2, sizeof(*ptrace_data2)); + if (ptrace_fd < 0) + return -1; + + perf_fd = perf_thread_event_open(child_pid, (__u64)perf_data2, + sizeof(*perf_data2)); + if (perf_fd < 0) { + ret = -1; + goto ptrace_close; + } + close(perf_fd); + +ptrace_close: + ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd); + return ret; +} + +static int test9(pid_t child_pid) +{ + int perf_fd; + int ptrace_fd; + int cpid; + int ret = 0; + + /* Test: + * if (new per thread event by perf) + * if (existing thread event by ptrace on the other thread) + * allow; + */ + ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data1, sizeof(*ptrace_data1)); + if (ptrace_fd < 0) + return -1; + + cpid = fork(); + if (!cpid) { + /* Temporary Child */ + pause(); + exit(EXIT_SUCCESS); + } + + perf_fd = perf_thread_event_open(cpid, (__u64)perf_data1, sizeof(*perf_data1)); + if (perf_fd < 0) { + ret = -1; + goto kill_child; + } + close(perf_fd); + +kill_child: + kill(cpid, SIGINT); + ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd); + return ret; +} + +static int test10(pid_t child_pid) +{ + int perf_fd; + int ptrace_fd; + int ret = 0; + + /* Test: + * if (new per cpu event by perf) + * if (existing thread event by ptrace on the same thread) + * if (addr range overlaps) + * fail; + */ + ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data1, sizeof(*ptrace_data1)); + if (ptrace_fd < 0) + return -1; + + perf_fd = perf_cpu_event_open(0, (__u64)perf_data1, sizeof(*perf_data1)); + if (perf_fd > 0 || errno != ENOSPC) + ret = -1; + + ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd); + return ret; +} + +static int test11(pid_t child_pid) +{ + int perf_fd; + int ptrace_fd; + int ret = 0; + + /* Test: + * if (new per cpu event by perf) + * if (existing thread event by ptrace on the same thread) + * if (addr range does not overlap) + * allow; + */ + ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data2, sizeof(*ptrace_data2)); + if (ptrace_fd < 0) + return -1; + + perf_fd = perf_cpu_event_open(0, (__u64)perf_data2, sizeof(*perf_data2)); + if (perf_fd < 0) { + ret = -1; + goto ptrace_close; + } + close(perf_fd); + +ptrace_close: + ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd); + return ret; +} + +static int test12(pid_t child_pid) +{ + int perf_fd; + int ptrace_fd; + int ret = 0; + + /* Test: + * if (new per thread and per cpu event by perf) + * if (existing thread event by ptrace on the same thread) + * if (addr range overlaps) + * fail; + */ + ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data1, sizeof(*ptrace_data1)); + if (ptrace_fd < 0) + return -1; + + perf_fd = perf_thread_cpu_event_open(child_pid, 0, (__u64)perf_data1, sizeof(*perf_data1)); + if (perf_fd > 0 || errno != ENOSPC) + ret = -1; + + ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd); + return ret; +} + +static int test13(pid_t child_pid) +{ + int perf_fd; + int ptrace_fd; + int ret = 0; + + /* Test: + * if (new per thread and per cpu event by perf) + * if (existing thread event by ptrace on the same thread) + * if (addr range does not overlap) + * allow; + */ + ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data2, sizeof(*ptrace_data2)); + if (ptrace_fd < 0) + return -1; + + perf_fd = perf_thread_cpu_event_open(child_pid, 0, (__u64)perf_data2, sizeof(*perf_data2)); + if (perf_fd < 0) { + ret = -1; + goto ptrace_close; + } + close(perf_fd); + +ptrace_close: + ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd); + return ret; +} + +static int test14(pid_t child_pid) +{ + int perf_fd; + int ptrace_fd; + int cpid; + int ret = 0; + + /* Test: + * if (new per thread and per cpu event by perf) + * if (existing thread event by ptrace on the other thread) + * allow; + */ + ptrace_fd = ptrace_open(child_pid, (__u64)ptrace_data1, sizeof(*ptrace_data1)); + if (ptrace_fd < 0) + return -1; + + cpid = fork(); + if (!cpid) { + /* Temporary Child */ + pause(); + exit(EXIT_SUCCESS); + } + + perf_fd = perf_thread_cpu_event_open(cpid, 0, (__u64)perf_data1, + sizeof(*perf_data1)); + if (perf_fd < 0) { + ret = -1; + goto kill_child; + } + close(perf_fd); + +kill_child: + kill(cpid, SIGINT); + ptrace(PPC_PTRACE_DELHWDEBUG, child_pid, 0, ptrace_fd); + return ret; +} + +static int do_test(const char *msg, int (*fun)(pid_t arg), pid_t arg) +{ + int ret; + + ret = fun(arg); + if (ret) + printf("%s: Error\n", msg); + else + printf("%s: Ok\n", msg); + return ret; +} + +char *desc[14] = { + "perf cpu event -> ptrace thread event (Overlapping)", + "perf cpu event -> ptrace thread event (Non-overlapping)", + "perf thread event -> ptrace same thread event (Overlapping)", + "perf thread event -> ptrace same thread event (Non-overlapping)", + "perf thread event -> ptrace other thread event", + "ptrace thread event -> perf kernel event", + "ptrace thread event -> perf same thread event (Overlapping)", + "ptrace thread event -> perf same thread event (Non-overlapping)", + "ptrace thread event -> perf other thread event", + "ptrace thread event -> perf cpu event (Overlapping)", + "ptrace thread event -> perf cpu event (Non-overlapping)", + "ptrace thread event -> perf same thread & cpu event (Overlapping)", + "ptrace thread event -> perf same thread & cpu event (Non-overlapping)", + "ptrace thread event -> perf other thread & cpu event", +}; + +static int test(pid_t child_pid) +{ + int ret = TEST_PASS; + + ret |= do_test(desc[0], test1, child_pid); + ret |= do_test(desc[1], test2, child_pid); + ret |= do_test(desc[2], test3, child_pid); + ret |= do_test(desc[3], test4, child_pid); + ret |= do_test(desc[4], test5, child_pid); + ret |= do_test(desc[5], test6, child_pid); + ret |= do_test(desc[6], test7, child_pid); + ret |= do_test(desc[7], test8, child_pid); + ret |= do_test(desc[8], test9, child_pid); + ret |= do_test(desc[9], test10, child_pid); + ret |= do_test(desc[10], test11, child_pid); + ret |= do_test(desc[11], test12, child_pid); + ret |= do_test(desc[12], test13, child_pid); + ret |= do_test(desc[13], test14, child_pid); + + return ret; +} + +static void get_dbginfo(pid_t child_pid, struct ppc_debug_info *dbginfo) +{ + if (ptrace(PPC_PTRACE_GETHWDBGINFO, child_pid, NULL, dbginfo)) { + perror("Can't get breakpoint info"); + exit(-1); + } +} + +static int ptrace_perf_hwbreak(void) +{ + int ret; + pid_t child_pid; + struct ppc_debug_info dbginfo; + + child_pid = fork(); + if (!child_pid) + return child(); + + /* parent */ + wait(NULL); /* <-- child (SIGUSR1) */ + + get_dbginfo(child_pid, &dbginfo); + SKIP_IF(dbginfo.num_data_bps <= 1); + + ret = perf_cpu_event_open(0, (__u64)perf_data1, sizeof(*perf_data1)); + SKIP_IF(ret < 0); + close(ret); + + ret = test(child_pid); + + ptrace(PTRACE_CONT, child_pid, NULL, 0); + return ret; +} + +int main(int argc, char *argv[]) +{ + return test_harness(ptrace_perf_hwbreak, "ptrace-perf-hwbreak"); +}