[PATCH v2 1/4] powerpc/selftests/ptrace-hwbreak: Add testcases for 2nd DAWR

[Ravi Bangoria]

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: Ravi Bangoria <ravi.bango...@linux.ibm.com>
---
 .../selftests/powerpc/ptrace/ptrace-hwbreak.c | 79 +++++++++++++++++++
 1 file changed, 79 insertions(+)

diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace-hwbreak.c 
b/tools/testing/selftests/powerpc/ptrace/ptrace-hwbreak.c
index 2e0d86e0687e..a0635a3819aa 100644
--- a/tools/testing/selftests/powerpc/ptrace/ptrace-hwbreak.c
+++ b/tools/testing/selftests/powerpc/ptrace/ptrace-hwbreak.c
@@ -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);
+                       }
                }
        }
 }
-- 
2.27.0