Commit dae4ff80 authored by Ravi Bangoria's avatar Ravi Bangoria Committed by Michael Ellerman
Browse files

powerpc/selftests/ptrace-hwbreak: Add testcases for 2nd DAWR 



Message-ID: <20210412112218.128183-2-ravi.bangoria@linux.ibm.com> (raw)

Add selftests to test multiple active DAWRs with ptrace interface.

Sample o/p:
  $ ./ptrace-hwbreak
  ...
  PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DW ALIGNED, WO, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DW UNALIGNED, RO, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DAWR Overlap, WO, len: 6: Ok
  PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DAWR Overlap, RO, len: 6: Ok

Signed-off-by: default avatarRavi Bangoria <ravi.bangoria@linux.ibm.com>
Reviewed-by: default avatarDaniel Axtens <dja@axtens.net>
[mpe: Fix build on older distros]
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 421a7483

tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c

+4 −0
Original line number Diff line number Diff line
@@ -30,6 +30,10 @@ 
#include <linux/hw_breakpoint.h>

#include "utils.h"



#ifndef PPC_DEBUG_FEATURE_DATA_BP_ARCH_31

#define PPC_DEBUG_FEATURE_DATA_BP_ARCH_31	0x20

#endif



#define MAX_LOOPS 10000



#define DAWR_LENGTH_MAX ((0x3f + 1) * 8)

tools/testing/selftests/powerpc/ptrace/ptrace-hwbreak.c

+79 −0
Original line number Diff line number Diff line
@@ -194,6 +194,18 @@ static void test_workload(void) 
		big_var[rand() % DAWR_MAX_LEN] = 'a';

	else

		cvar = big_var[rand() % DAWR_MAX_LEN];



	/* PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DW ALIGNED, WO test */

	gstruct.a[rand() % A_LEN] = 'a';



	/* PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DW UNALIGNED, RO test */

	cvar = gstruct.b[rand() % B_LEN];



	/* PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DAWR Overlap, WO test */

	gstruct.a[rand() % A_LEN] = 'a';



	/* PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DAWR Overlap, RO test */

	cvar = gstruct.a[rand() % A_LEN];

}



static void check_success(pid_t child_pid, const char *name, const char *type,
@@ -417,6 +429,69 @@ static void test_sethwdebug_range_aligned(pid_t child_pid) 
	ptrace_delhwdebug(child_pid, wh);

}



static void test_multi_sethwdebug_range(pid_t child_pid)

{

	struct ppc_hw_breakpoint info1, info2;

	unsigned long wp_addr1, wp_addr2;

	char *name1 = "PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DW ALIGNED";

	char *name2 = "PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DW UNALIGNED";

	int len1, len2;

	int wh1, wh2;



	wp_addr1 = (unsigned long)&gstruct.a;

	wp_addr2 = (unsigned long)&gstruct.b;

	len1 = A_LEN;

	len2 = B_LEN;

	get_ppc_hw_breakpoint(&info1, PPC_BREAKPOINT_TRIGGER_WRITE, wp_addr1, len1);

	get_ppc_hw_breakpoint(&info2, PPC_BREAKPOINT_TRIGGER_READ, wp_addr2, len2);



	/* PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DW ALIGNED, WO test */

	wh1 = ptrace_sethwdebug(child_pid, &info1);



	/* PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DW UNALIGNED, RO test */

	wh2 = ptrace_sethwdebug(child_pid, &info2);



	ptrace(PTRACE_CONT, child_pid, NULL, 0);

	check_success(child_pid, name1, "WO", wp_addr1, len1);



	ptrace(PTRACE_CONT, child_pid, NULL, 0);

	check_success(child_pid, name2, "RO", wp_addr2, len2);



	ptrace_delhwdebug(child_pid, wh1);

	ptrace_delhwdebug(child_pid, wh2);

}



static void test_multi_sethwdebug_range_dawr_overlap(pid_t child_pid)

{

	struct ppc_hw_breakpoint info1, info2;

	unsigned long wp_addr1, wp_addr2;

	char *name = "PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DAWR Overlap";

	int len1, len2;

	int wh1, wh2;



	wp_addr1 = (unsigned long)&gstruct.a;

	wp_addr2 = (unsigned long)&gstruct.a;

	len1 = A_LEN;

	len2 = A_LEN;

	get_ppc_hw_breakpoint(&info1, PPC_BREAKPOINT_TRIGGER_WRITE, wp_addr1, len1);

	get_ppc_hw_breakpoint(&info2, PPC_BREAKPOINT_TRIGGER_READ, wp_addr2, len2);



	/* PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DAWR Overlap, WO test */

	wh1 = ptrace_sethwdebug(child_pid, &info1);



	/* PPC_PTRACE_SETHWDEBUG 2, MODE_RANGE, DAWR Overlap, RO test */

	wh2 = ptrace_sethwdebug(child_pid, &info2);



	ptrace(PTRACE_CONT, child_pid, NULL, 0);

	check_success(child_pid, name, "WO", wp_addr1, len1);



	ptrace(PTRACE_CONT, child_pid, NULL, 0);

	check_success(child_pid, name, "RO", wp_addr2, len2);



	ptrace_delhwdebug(child_pid, wh1);

	ptrace_delhwdebug(child_pid, wh2);

}



static void test_sethwdebug_range_unaligned(pid_t child_pid)

{

	struct ppc_hw_breakpoint info;
@@ -504,6 +579,10 @@ run_tests(pid_t child_pid, struct ppc_debug_info *dbginfo, bool dawr) 
			test_sethwdebug_range_unaligned(child_pid);

			test_sethwdebug_range_unaligned_dar(child_pid);

			test_sethwdebug_dawr_max_range(child_pid);

			if (dbginfo->num_data_bps > 1) {

				test_multi_sethwdebug_range(child_pid);

				test_multi_sethwdebug_range_dawr_overlap(child_pid);

			}

		}

	}

}