[PATCH V6 0/4] perf/x86/amd: AMD Family 16h Data Breakpoint Extensions

[PATCH V6 0/4] perf/x86/amd: AMD Family 16h Data Breakpoint Extensions

[suravee.suthikulpanit]

From: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>

The following patchset enables hardware breakpoint bp_len greater than
HW_BREAKPOINT_LEN_8 on AMD Family 16h and later.

  $ perf stat -e mem:0x1000/16:w a.out
                            ^^
                            bp_len

This will count writes to [0x1000 ~ 0x1010)

V6:
* Minor clean up in patch 1 and 2 based on comment from Frederic and Oleg.
* Split out changes in patch1 into patch4 per Frederic request.

V5:
* Rebase onto 3.12.0-rc3.
* Modify the tools/perf/util/parse-events.y due to change in
  parse_events_add_breakpoint().

V4:
Even more per Oleg's suggestion:
* Further simplify info->len and info->mask setting switch statement

V3:
More per Oleg's suggestion:
* Use already existing bp_len instead of changing userland API and
  in kernel turn bp_len into proper AMD hardware breakpoint address
  mask.

V2:
Per Oleg's suggestions:
* Moved testing of bp_addr_mask to validate_hw_breakpoint()
* Changed perf tool syntax to mem:<addr>[/addr_mask][:access]

Jacob Shin (4):
  perf/x86/amd: AMD support for bp_len > HW_BREAKPOINT_LEN_8
  perf tools: allow user to specify hardware breakpoint bp_len
  perf tools: add hardware breakpoint bp_len test cases
  perf/x86: Remove get_hbp_len and replace with bp_len

 arch/x86/include/asm/cpufeature.h        |  2 ++
 arch/x86/include/asm/debugreg.h          |  5 +++
 arch/x86/include/asm/hw_breakpoint.h     |  1 +
 arch/x86/include/uapi/asm/msr-index.h    |  4 +++
 arch/x86/kernel/cpu/amd.c                | 19 +++++++++++
 arch/x86/kernel/hw_breakpoint.c          | 45 ++++++++++----------------
 tools/perf/Documentation/perf-record.txt |  7 ++--
 tools/perf/tests/parse-events.c          | 55 ++++++++++++++++++++++++++++++++
 tools/perf/util/parse-events.c           | 21 ++++++------
 tools/perf/util/parse-events.h           |  2 +-
 tools/perf/util/parse-events.l           |  1 +
 tools/perf/util/parse-events.y           | 26 +++++++++++++--
 12 files changed, 145 insertions(+), 43 deletions(-)

-- 
1.8.1.2

[PATCH 1/4] perf/x86/amd: AMD support for bp_len > HW_BREAKPOINT_LEN_8

[suravee.suthikulpanit]

From: Jacob Shin <jacob.w.shin@gmail.com>

Implement hardware breakpoint address mask for AMD Family 16h and
above processors. CPUID feature bit indicates hardware support for
DRn_ADDR_MASK MSRs. These masks further qualify DRn/DR7 hardware
breakpoint addresses to allow matching of larger addresses ranges.

Valuable advice and pseudo code from Oleg Nesterov <oleg@redhat.com>

Signed-off-by: Jacob Shin <jacob.w.shin@gmail.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
 arch/x86/include/asm/cpufeature.h     |  2 ++
 arch/x86/include/asm/debugreg.h       |  5 +++++
 arch/x86/include/asm/hw_breakpoint.h  |  1 +
 arch/x86/include/uapi/asm/msr-index.h |  4 ++++
 arch/x86/kernel/cpu/amd.c             | 19 +++++++++++++++++++
 arch/x86/kernel/hw_breakpoint.c       | 20 ++++++++++++++++----
 6 files changed, 47 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 89270b4..2e8b0b2 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -170,6 +170,7 @@
 #define X86_FEATURE_TOPOEXT	(6*32+22) /* topology extensions CPUID leafs */
 #define X86_FEATURE_PERFCTR_CORE (6*32+23) /* core performance counter extensions */
 #define X86_FEATURE_PERFCTR_NB  (6*32+24) /* NB performance counter extensions */
+#define X86_FEATURE_BPEXT	(6*32+26) /* data breakpoint extension */
 #define X86_FEATURE_PERFCTR_L2	(6*32+28) /* L2 performance counter extensions */
 
 /*
@@ -332,6 +333,7 @@ extern const char * const x86_power_flags[32];
 #define cpu_has_cx16		boot_cpu_has(X86_FEATURE_CX16)
 #define cpu_has_eager_fpu	boot_cpu_has(X86_FEATURE_EAGER_FPU)
 #define cpu_has_topoext		boot_cpu_has(X86_FEATURE_TOPOEXT)
+#define cpu_has_bpext		boot_cpu_has(X86_FEATURE_BPEXT)
 
 #ifdef CONFIG_X86_64
 
diff --git a/arch/x86/include/asm/debugreg.h b/arch/x86/include/asm/debugreg.h
index 4b528a9..145b009 100644
--- a/arch/x86/include/asm/debugreg.h
+++ b/arch/x86/include/asm/debugreg.h
@@ -114,5 +114,10 @@ static inline void debug_stack_usage_inc(void) { }
 static inline void debug_stack_usage_dec(void) { }
 #endif /* X86_64 */
 
+#ifdef CONFIG_CPU_SUP_AMD
+extern void set_dr_addr_mask(unsigned long mask, int dr);
+#else
+static inline void set_dr_addr_mask(unsigned long mask, int dr) { }
+#endif
 
 #endif /* _ASM_X86_DEBUGREG_H */
diff --git a/arch/x86/include/asm/hw_breakpoint.h b/arch/x86/include/asm/hw_breakpoint.h
index ef1c4d2..6c98be8 100644
--- a/arch/x86/include/asm/hw_breakpoint.h
+++ b/arch/x86/include/asm/hw_breakpoint.h
@@ -12,6 +12,7 @@
  */
 struct arch_hw_breakpoint {
 	unsigned long	address;
+	unsigned long	mask;
 	u8		len;
 	u8		type;
 };
diff --git a/arch/x86/include/uapi/asm/msr-index.h b/arch/x86/include/uapi/asm/msr-index.h
index 37813b5..bf8388e 100644
--- a/arch/x86/include/uapi/asm/msr-index.h
+++ b/arch/x86/include/uapi/asm/msr-index.h
@@ -207,6 +207,10 @@
 /* Fam 16h MSRs */
 #define MSR_F16H_L2I_PERF_CTL		0xc0010230
 #define MSR_F16H_L2I_PERF_CTR		0xc0010231
+#define MSR_F16H_DR1_ADDR_MASK		0xc0011019
+#define MSR_F16H_DR2_ADDR_MASK		0xc001101a
+#define MSR_F16H_DR3_ADDR_MASK		0xc001101b
+#define MSR_F16H_DR0_ADDR_MASK		0xc0011027
 
 /* Fam 15h MSRs */
 #define MSR_F15H_PERF_CTL		0xc0010200
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index bca023b..b4d895a 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -909,3 +909,22 @@ static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum)
 
 	return false;
 }
+
+void set_dr_addr_mask(unsigned long mask, int dr)
+{
+	if (!cpu_has_bpext)
+		return;
+
+	switch (dr) {
+	case 0:
+		wrmsr(MSR_F16H_DR0_ADDR_MASK, mask, 0);
+		break;
+	case 1:
+	case 2:
+	case 3:
+		wrmsr(MSR_F16H_DR1_ADDR_MASK - 1 + dr, mask, 0);
+		break;
+	default:
+		break;
+	}
+}
diff --git a/arch/x86/kernel/hw_breakpoint.c b/arch/x86/kernel/hw_breakpoint.c
index f66ff16..647b675 100644
--- a/arch/x86/kernel/hw_breakpoint.c
+++ b/arch/x86/kernel/hw_breakpoint.c
@@ -128,6 +128,8 @@ int arch_install_hw_breakpoint(struct perf_event *bp)
 	*dr7 |= encode_dr7(i, info->len, info->type);
 
 	set_debugreg(*dr7, 7);
+	if (info->mask)
+		set_dr_addr_mask(info->mask, i);
 
 	return 0;
 }
@@ -163,6 +165,8 @@ void arch_uninstall_hw_breakpoint(struct perf_event *bp)
 	*dr7 &= ~__encode_dr7(i, info->len, info->type);
 
 	set_debugreg(*dr7, 7);
+	if (info->mask)
+		set_dr_addr_mask(0, i);
 }
 
 static int get_hbp_len(u8 hbp_len)
@@ -279,6 +283,8 @@ static int arch_build_bp_info(struct perf_event *bp)
 	}
 
 	/* Len */
+	info->mask = 0;
+
 	switch (bp->attr.bp_len) {
 	case HW_BREAKPOINT_LEN_1:
 		info->len = X86_BREAKPOINT_LEN_1;
@@ -295,11 +301,17 @@ static int arch_build_bp_info(struct perf_event *bp)
 		break;
 #endif
 	default:
-		return -EINVAL;
+		if (!is_power_of_2(bp->attr.bp_len))
+			return -EINVAL;
+		if (!cpu_has_bpext)
+			return -EOPNOTSUPP;
+		info->mask = bp->attr.bp_len - 1;
+		info->len = X86_BREAKPOINT_LEN_1;
 	}
 
 	return 0;
 }
+
 /*
  * Validate the arch-specific HW Breakpoint register settings
  */
@@ -314,11 +326,11 @@ int arch_validate_hwbkpt_settings(struct perf_event *bp)
 	if (ret)
 		return ret;
 
-	ret = -EINVAL;
-
 	switch (info->len) {
 	case X86_BREAKPOINT_LEN_1:
 		align = 0;
+		if (info->mask)
+			align = info->mask;
 		break;
 	case X86_BREAKPOINT_LEN_2:
 		align = 1;
@@ -332,7 +344,7 @@ int arch_validate_hwbkpt_settings(struct perf_event *bp)
 		break;
 #endif
 	default:
-		return ret;
+		WARN_ON_ONCE(1);
 	}
 
 	/*
-- 
1.8.1.2

[PATCH 2/4] perf tools: allow user to specify hardware breakpoint bp_len

[suravee.suthikulpanit]

From: Jacob Shin <jacob.w.shin@gmail.com>

Currently bp_len is given a default value of 4. Allow user to override it:

  $ perf stat -e mem:0x1000/8
                            ^
                            bp_len

If no value is given, it will default to 4 as it did before.

Signed-off-by: Jacob Shin <jacob.w.shin@gmail.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
 tools/perf/Documentation/perf-record.txt |  7 +++++--
 tools/perf/util/parse-events.c           | 21 +++++++++++----------
 tools/perf/util/parse-events.h           |  2 +-
 tools/perf/util/parse-events.l           |  1 +
 tools/perf/util/parse-events.y           | 26 ++++++++++++++++++++++++--
 5 files changed, 42 insertions(+), 15 deletions(-)

diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 43b42c4..7b4f594 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -33,12 +33,15 @@ OPTIONS
         - a raw PMU event (eventsel+umask) in the form of rNNN where NNN is a
 	  hexadecimal event descriptor.
 
-        - a hardware breakpoint event in the form of '\mem:addr[:access]'
+        - a hardware breakpoint event in the form of '\mem:addr[/len][:access]'
           where addr is the address in memory you want to break in.
           Access is the memory access type (read, write, execute) it can
-          be passed as follows: '\mem:addr[:[r][w][x]]'.
+          be passed as follows: '\mem:addr[:[r][w][x]]'. len is the range,
+          number of bytes from specified addr, which the breakpoint will cover.
           If you want to profile read-write accesses in 0x1000, just set
           'mem:0x1000:rw'.
+          If you want to profile write accesses in [0x1000~1008), just set
+          'mem:0x1000/8:w'.
 
 --filter=<filter>::
         Event filter.
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 6de6f89..2a15f24 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -515,7 +515,7 @@ do {					\
 }
 
 int parse_events_add_breakpoint(struct list_head *list, int *idx,
-				void *ptr, char *type)
+				void *ptr, char *type, u64 len)
 {
 	struct perf_event_attr attr;
 
@@ -525,14 +525,15 @@ int parse_events_add_breakpoint(struct list_head *list, int *idx,
 	if (parse_breakpoint_type(type, &attr))
 		return -EINVAL;
 
-	/*
-	 * We should find a nice way to override the access length
-	 * Provide some defaults for now
-	 */
-	if (attr.bp_type == HW_BREAKPOINT_X)
-		attr.bp_len = sizeof(long);
-	else
-		attr.bp_len = HW_BREAKPOINT_LEN_4;
+	/* Provide some defaults if len is not specified */
+	if (!len) {
+		if (attr.bp_type == HW_BREAKPOINT_X)
+			len = sizeof(long);
+		else
+			len = HW_BREAKPOINT_LEN_4;
+	}
+
+	attr.bp_len = len;
 
 	attr.type = PERF_TYPE_BREAKPOINT;
 	attr.sample_period = 1;
@@ -1240,7 +1241,7 @@ void print_events(const char *event_glob, bool name_only)
 		printf("\n");
 
 		printf("  %-50s [%s]\n",
-		       "mem:<addr>[:access]",
+		       "mem:<addr>[/len][:access]",
 			event_type_descriptors[PERF_TYPE_BREAKPOINT]);
 		printf("\n");
 	}
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index f1cb4c4..54a20df 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -93,7 +93,7 @@ int parse_events_add_numeric(struct list_head *list, int *idx,
 int parse_events_add_cache(struct list_head *list, int *idx,
 			   char *type, char *op_result1, char *op_result2);
 int parse_events_add_breakpoint(struct list_head *list, int *idx,
-				void *ptr, char *type);
+				void *ptr, char *type, u64 len);
 int parse_events_add_pmu(struct list_head *list, int *idx,
 			 char *pmu , struct list_head *head_config);
 void parse_events__set_leader(char *name, struct list_head *list);
diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index 3432995..199e18a 100644
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -141,6 +141,7 @@ branch_type		{ return term(yyscanner, PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE
 <mem>{
 {modifier_bp}		{ return str(yyscanner, PE_MODIFIER_BP); }
 :			{ return ':'; }
+"/"			{ return '/'; }
 {num_dec}		{ return value(yyscanner, 10); }
 {num_hex}		{ return value(yyscanner, 16); }
 	/*
diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index 4eb67ec..c9adf4d 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -276,6 +276,28 @@ PE_NAME_CACHE_TYPE
 }
 
 event_legacy_mem:
+PE_PREFIX_MEM PE_VALUE '/' PE_VALUE ':' PE_MODIFIER_BP sep_dc
+{
+	struct parse_events_evlist *data = _data;
+	struct list_head *list;
+
+	ALLOC_LIST(list);
+	ABORT_ON(parse_events_add_breakpoint(list, &data->idx,
+					     (void *) $2, $6, $4));
+	$$ = list;
+}
+|
+PE_PREFIX_MEM PE_VALUE '/' PE_VALUE sep_dc
+{
+	struct parse_events_evlist *data = _data;
+	struct list_head *list;
+
+	ALLOC_LIST(list);
+	ABORT_ON(parse_events_add_breakpoint(list, &data->idx,
+					     (void *) $2, NULL, $4));
+	$$ = list;
+}
+|
 PE_PREFIX_MEM PE_VALUE ':' PE_MODIFIER_BP sep_dc
 {
 	struct parse_events_evlist *data = _data;
@@ -283,7 +305,7 @@ PE_PREFIX_MEM PE_VALUE ':' PE_MODIFIER_BP sep_dc
 
 	ALLOC_LIST(list);
 	ABORT_ON(parse_events_add_breakpoint(list, &data->idx,
-					     (void *) $2, $4));
+					     (void *) $2, $4, 0));
 	$$ = list;
 }
 |
@@ -294,7 +316,7 @@ PE_PREFIX_MEM PE_VALUE sep_dc
 
 	ALLOC_LIST(list);
 	ABORT_ON(parse_events_add_breakpoint(list, &data->idx,
-					     (void *) $2, NULL));
+					     (void *) $2, NULL, 0));
 	$$ = list;
 }
 
-- 
1.8.1.2

[PATCH 3/4] perf tools: add hardware breakpoint bp_len test cases

[suravee.suthikulpanit]

From: Jacob Shin <jacob.w.shin@gmail.com>

Signed-off-by: Jacob Shin <jacob.w.shin@gmail.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
 tools/perf/tests/parse-events.c | 55 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c
index 3cbd104..0c5bffc 100644
--- a/tools/perf/tests/parse-events.c
+++ b/tools/perf/tests/parse-events.c
@@ -1114,6 +1114,49 @@ static int test__pinned_group(struct perf_evlist *evlist)
 	return 0;
 }
 
+static int test__checkevent_breakpoint_len(struct perf_evlist *evlist)
+{
+	struct perf_evsel *evsel = perf_evlist__first(evlist);
+
+	TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
+	TEST_ASSERT_VAL("wrong type", PERF_TYPE_BREAKPOINT == evsel->attr.type);
+	TEST_ASSERT_VAL("wrong config", 0 == evsel->attr.config);
+	TEST_ASSERT_VAL("wrong bp_type", (HW_BREAKPOINT_R | HW_BREAKPOINT_W) ==
+					 evsel->attr.bp_type);
+	TEST_ASSERT_VAL("wrong bp_len", HW_BREAKPOINT_LEN_1 ==
+					evsel->attr.bp_len);
+
+	return 0;
+}
+
+static int test__checkevent_breakpoint_len_w(struct perf_evlist *evlist)
+{
+	struct perf_evsel *evsel = perf_evlist__first(evlist);
+
+	TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
+	TEST_ASSERT_VAL("wrong type", PERF_TYPE_BREAKPOINT == evsel->attr.type);
+	TEST_ASSERT_VAL("wrong config", 0 == evsel->attr.config);
+	TEST_ASSERT_VAL("wrong bp_type", HW_BREAKPOINT_W ==
+					 evsel->attr.bp_type);
+	TEST_ASSERT_VAL("wrong bp_len", HW_BREAKPOINT_LEN_2 ==
+					evsel->attr.bp_len);
+
+	return 0;
+}
+
+static int
+test__checkevent_breakpoint_len_rw_modifier(struct perf_evlist *evlist)
+{
+	struct perf_evsel *evsel = perf_evlist__first(evlist);
+
+	TEST_ASSERT_VAL("wrong exclude_user", !evsel->attr.exclude_user);
+	TEST_ASSERT_VAL("wrong exclude_kernel", evsel->attr.exclude_kernel);
+	TEST_ASSERT_VAL("wrong exclude_hv", evsel->attr.exclude_hv);
+	TEST_ASSERT_VAL("wrong precise_ip", !evsel->attr.precise_ip);
+
+	return test__checkevent_breakpoint_rw(evlist);
+}
+
 static int count_tracepoints(void)
 {
 	char events_path[PATH_MAX];
@@ -1346,6 +1389,18 @@ static struct evlist_test test__events[] = {
 		.name  = "{cycles,cache-misses,branch-misses}:D",
 		.check = test__pinned_group,
 	},
+	[42] = {
+		.name  = "mem:0/1",
+		.check = test__checkevent_breakpoint_len,
+	},
+	[43] = {
+		.name  = "mem:0/2:w",
+		.check = test__checkevent_breakpoint_len_w,
+	},
+	[44] = {
+		.name  = "mem:0/4:rw:u",
+		.check = test__checkevent_breakpoint_len_rw_modifier,
+	},
 };
 
 static struct evlist_test test__events_pmu[] = {
-- 
1.8.1.2

[PATCH 4/4] perf/x86: Remove get_hbp_len and replace with bp_len

[suravee.suthikulpanit]

From: Jacob Shin <jacob.w.shin@gmail.com>

Clean up the logic for determining the breakpoint length

Signed-off-by: Jacob Shin <jacob.w.shin@gmail.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
 arch/x86/kernel/hw_breakpoint.c | 25 +------------------------
 1 file changed, 1 insertion(+), 24 deletions(-)

diff --git a/arch/x86/kernel/hw_breakpoint.c b/arch/x86/kernel/hw_breakpoint.c
index 647b675..4ada2c3 100644
--- a/arch/x86/kernel/hw_breakpoint.c
+++ b/arch/x86/kernel/hw_breakpoint.c
@@ -169,29 +169,6 @@ void arch_uninstall_hw_breakpoint(struct perf_event *bp)
 		set_dr_addr_mask(0, i);
 }
 
-static int get_hbp_len(u8 hbp_len)
-{
-	unsigned int len_in_bytes = 0;
-
-	switch (hbp_len) {
-	case X86_BREAKPOINT_LEN_1:
-		len_in_bytes = 1;
-		break;
-	case X86_BREAKPOINT_LEN_2:
-		len_in_bytes = 2;
-		break;
-	case X86_BREAKPOINT_LEN_4:
-		len_in_bytes = 4;
-		break;
-#ifdef CONFIG_X86_64
-	case X86_BREAKPOINT_LEN_8:
-		len_in_bytes = 8;
-		break;
-#endif
-	}
-	return len_in_bytes;
-}
-
 /*
  * Check for virtual address in kernel space.
  */
@@ -202,7 +179,7 @@ int arch_check_bp_in_kernelspace(struct perf_event *bp)
 	struct arch_hw_breakpoint *info = counter_arch_bp(bp);
 
 	va = info->address;
-	len = get_hbp_len(info->len);
+	len = bp->attr.bp_len;
 
 	return (va >= TASK_SIZE) && ((va + len - 1) >= TASK_SIZE);
 }
-- 
1.8.1.2

Re: [PATCH V6 0/4] perf/x86/amd: AMD Family 16h Data Breakpoint Extensions

[Suravee Suthikulanit]

Ping.  Are there any other concerns regarding this patch?

Thank you,

Suravee

On 12/11/2013 6:28 AM, suravee.suthikulpanit@amd.com wrote:
> From: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
>
> The following patchset enables hardware breakpoint bp_len greater than
> HW_BREAKPOINT_LEN_8 on AMD Family 16h and later.
>
>    $ perf stat -e mem:0x1000/16:w a.out
>                              ^^
>                              bp_len
>
> This will count writes to [0x1000 ~ 0x1010)
>
> V6:
> * Minor clean up in patch 1 and 2 based on comment from Frederic and Oleg.
> * Split out changes in patch1 into patch4 per Frederic request.
>
> V5:
> * Rebase onto 3.12.0-rc3.
> * Modify the tools/perf/util/parse-events.y due to change in
>    parse_events_add_breakpoint().
>
> V4:
> Even more per Oleg's suggestion:
> * Further simplify info->len and info->mask setting switch statement
>
> V3:
> More per Oleg's suggestion:
> * Use already existing bp_len instead of changing userland API and
>    in kernel turn bp_len into proper AMD hardware breakpoint address
>    mask.
>
> V2:
> Per Oleg's suggestions:
> * Moved testing of bp_addr_mask to validate_hw_breakpoint()
> * Changed perf tool syntax to mem:<addr>[/addr_mask][:access]
>
> Jacob Shin (4):
>    perf/x86/amd: AMD support for bp_len > HW_BREAKPOINT_LEN_8
>    perf tools: allow user to specify hardware breakpoint bp_len
>    perf tools: add hardware breakpoint bp_len test cases
>    perf/x86: Remove get_hbp_len and replace with bp_len
>
>   arch/x86/include/asm/cpufeature.h        |  2 ++
>   arch/x86/include/asm/debugreg.h          |  5 +++
>   arch/x86/include/asm/hw_breakpoint.h     |  1 +
>   arch/x86/include/uapi/asm/msr-index.h    |  4 +++
>   arch/x86/kernel/cpu/amd.c                | 19 +++++++++++
>   arch/x86/kernel/hw_breakpoint.c          | 45 ++++++++++----------------
>   tools/perf/Documentation/perf-record.txt |  7 ++--
>   tools/perf/tests/parse-events.c          | 55 ++++++++++++++++++++++++++++++++
>   tools/perf/util/parse-events.c           | 21 ++++++------
>   tools/perf/util/parse-events.h           |  2 +-
>   tools/perf/util/parse-events.l           |  1 +
>   tools/perf/util/parse-events.y           | 26 +++++++++++++--
>   12 files changed, 145 insertions(+), 43 deletions(-)
>

Re: [PATCH 1/4] perf/x86/amd: AMD support for bp_len > HW_BREAKPOINT_LEN_8

[Frederic Weisbecker]

On Wed, Dec 11, 2013 at 06:28:23AM -0600, suravee.suthikulpanit@amd.com wrote:
> @@ -295,11 +301,17 @@ static int arch_build_bp_info(struct perf_event *bp)
>  		break;
>  #endif
>  	default:
> -		return -EINVAL;
> +		if (!is_power_of_2(bp->attr.bp_len))
> +			return -EINVAL;
> +		if (!cpu_has_bpext)
> +			return -EOPNOTSUPP;
> +		info->mask = bp->attr.bp_len - 1;
> +		info->len = X86_BREAKPOINT_LEN_1;

I think I asked this before but I can't remember. So dr7 must have
length as LEN_1 for breakpoint extension?

Re: [PATCH V6 0/4] perf/x86/amd: AMD Family 16h Data Breakpoint Extensions

[Frederic Weisbecker]

Hi Suravee,

On Wed, Jan 08, 2014 at 01:00:36PM -0600, Suravee Suthikulanit wrote:
> Ping.  Are there any other concerns regarding this patch?
> 
> Thank you,
> 
> Suravee

The patches look good. I'll apply the series and propose it to the perf maintainers.

Thanks!

Re: [PATCH V6 0/4] perf/x86/amd: AMD Family 16h Data Breakpoint Extensions

[Suravee Suthikulanit]

On 1/8/2014 7:52 PM, Frederic Weisbecker wrote:
> This message has been archived. View the original item
> <http://ausev2.amd.com/EnterpriseVault/ViewMessage.asp?VaultId=1EBD12133601C6E47868220A36CFE2B201110000amdvault.amd.com&SavesetId=201402081892875~201401090153030000~Z~D12198340FA0E3A8078F6DDADF1DAC51>
> Hi Suravee,
>
> On Wed, Jan 08, 2014 at 01:00:36PM -0600, Suravee Suthikulanit wrote:
>  > Ping.  Are there any other concerns regarding this patch?
>  >
>  > Thank you,
>  >
>  > Suravee
>
> The patches look good. I'll apply the series and propose it to the perf
> maintainers.
>
> Thanks!
>

Frederic,

I am following up with this patch set.

Suravee

Re: [PATCH V6 0/4] perf/x86/amd: AMD Family 16h Data Breakpoint Extensions

[Frederic Weisbecker]

On Tue, Feb 25, 2014 at 09:09:29AM -0600, Suravee Suthikulanit wrote:
> On 1/8/2014 7:52 PM, Frederic Weisbecker wrote:
> >This message has been archived. View the original item
> ><http://ausev2.amd.com/EnterpriseVault/ViewMessage.asp?VaultId=1EBD12133601C6E47868220A36CFE2B201110000amdvault.amd.com&SavesetId=201402081892875~201401090153030000~Z~D12198340FA0E3A8078F6DDADF1DAC51>
> >Hi Suravee,
> >
> >On Wed, Jan 08, 2014 at 01:00:36PM -0600, Suravee Suthikulanit wrote:
> > > Ping.  Are there any other concerns regarding this patch?
> > >
> > > Thank you,
> > >
> > > Suravee
> >
> >The patches look good. I'll apply the series and propose it to the perf
> >maintainers.
> >
> >Thanks!
> >
> 
> Frederic,
> 
> I am following up with this patch set.

Thanks for the reminder. I'm applying this right now and will propose for 3.15.

Thanks.

Re: [PATCH V6 0/4] perf/x86/amd: AMD Family 16h Data Breakpoint Extensions

[Suravee Suthikulanit]

On 2/25/2014 9:49 AM, Frederic Weisbecker wrote:
> This message has been archived. View the original item
> <http://ausev2.amd.com/EnterpriseVault/ViewMessage.asp?VaultId=1EBD12133601C6E47868220A36CFE2B201110000amdvault.amd.com&SavesetId=201403275961891~201402251548080000~Z~F07F5E04B0F823C085F9DFEECF2BA521>
> On Tue, Feb 25, 2014 at 09:09:29AM -0600, Suravee Suthikulanit wrote:
>  > On 1/8/2014 7:52 PM, Frederic Weisbecker wrote:
>  > >This message has been archived. View the original item
>  >
>  ><http://ausev2.amd.com/EnterpriseVault/ViewMessage.asp?VaultId=1EBD12133601C6E47868220A36CFE2B201110000amdvault.amd.com&SavesetId=201402081892875~201401090153030000~Z~D12198340FA0E3A8078F6DDADF1DAC51>
>  > >Hi Suravee,
>  > >
>  > >On Wed, Jan 08, 2014 at 01:00:36PM -0600, Suravee Suthikulanit wrote:
>  > > > Ping.  Are there any other concerns regarding this patch?
>  > > >
>  > > > Thank you,
>  > > >
>  > > > Suravee
>  > >
>  > >The patches look good. I'll apply the series and propose it to the perf
>  > >maintainers.
>  > >
>  > >Thanks!
>  > >
>  >
>  > Frederic,
>  >
>  > I am following up with this patch set.
>
> Thanks for the reminder. I'm applying this right now and will propose
> for 3.15.
>
> Thanks.
>

Frederic,

I am still not seeing these patch set in the 3.15.0-rc3.  Are you still 
planning to include this in the 3.15?

Thanks,

Suravee