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Date: Thu, 7 May 2009 09:25:04 GMT
From: tip-bot for Markus Metzger <markus.t.metzger@...el.com>
To: linux-tip-commits@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
markus.t.metzger@...el.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:tracing/core] x86, ds: support Core i7
Commit-ID: 017bc617657c928cb9a0c45a7a7e9f4e66695347
Gitweb: http://git.kernel.org/tip/017bc617657c928cb9a0c45a7a7e9f4e66695347
Author: Markus Metzger <markus.t.metzger@...el.com>
AuthorDate: Fri, 3 Apr 2009 16:43:52 +0200
Committer: Ingo Molnar <mingo@...e.hu>
CommitDate: Tue, 7 Apr 2009 13:36:36 +0200
x86, ds: support Core i7
Add debug store support for Core i7.
Core i7 adds a reset value for each performance counter and a new
PEBS record format.
Signed-off-by: Markus Metzger <markus.t.metzger@...el.com>
Cc: roland@...hat.com
Cc: eranian@...glemail.com
Cc: oleg@...hat.com
Cc: juan.villacis@...el.com
Cc: ak@...ux.jf.intel.com
LKML-Reference: <20090403144607.088997000@...el.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
arch/x86/include/asm/ds.h | 12 ++++++--
arch/x86/kernel/ds.c | 69 ++++++++++++++++++++++++++++++++++++++++----
2 files changed, 71 insertions(+), 10 deletions(-)
diff --git a/arch/x86/include/asm/ds.h b/arch/x86/include/asm/ds.h
index 149e520..70dac19 100644
--- a/arch/x86/include/asm/ds.h
+++ b/arch/x86/include/asm/ds.h
@@ -234,8 +234,12 @@ struct bts_trace {
struct pebs_trace {
struct ds_trace ds;
- /* the PEBS reset value */
- unsigned long long reset_value;
+ /* the number of valid counters in the below array */
+ unsigned int counters;
+
+#define MAX_PEBS_COUNTERS 4
+ /* the counter reset value */
+ unsigned long long counter_reset[MAX_PEBS_COUNTERS];
};
@@ -270,9 +274,11 @@ extern int ds_reset_pebs(struct pebs_tracer *tracer);
* Returns 0 on success; -Eerrno on error
*
* tracer: the tracer handle returned from ds_request_pebs()
+ * counter: the index of the counter
* value: the new counter reset value
*/
-extern int ds_set_pebs_reset(struct pebs_tracer *tracer, u64 value);
+extern int ds_set_pebs_reset(struct pebs_tracer *tracer,
+ unsigned int counter, u64 value);
/*
* Initialization
diff --git a/arch/x86/kernel/ds.c b/arch/x86/kernel/ds.c
index 4e05157..48bfe13 100644
--- a/arch/x86/kernel/ds.c
+++ b/arch/x86/kernel/ds.c
@@ -44,6 +44,9 @@ struct ds_configuration {
/* The size of a BTS/PEBS record in bytes: */
unsigned char sizeof_rec[2];
+ /* The number of pebs counter reset values in the DS structure. */
+ unsigned char nr_counter_reset;
+
/* Control bit-masks indexed by enum ds_feature: */
unsigned long ctl[dsf_ctl_max];
};
@@ -51,7 +54,7 @@ static struct ds_configuration ds_cfg __read_mostly;
/* Maximal size of a DS configuration: */
-#define MAX_SIZEOF_DS (12 * 8)
+#define MAX_SIZEOF_DS 0x80
/* Maximal size of a BTS record: */
#define MAX_SIZEOF_BTS (3 * 8)
@@ -59,6 +62,12 @@ static struct ds_configuration ds_cfg __read_mostly;
/* BTS and PEBS buffer alignment: */
#define DS_ALIGNMENT (1 << 3)
+/* Number of buffer pointers in DS: */
+#define NUM_DS_PTR_FIELDS 8
+
+/* Size of a pebs reset value in DS: */
+#define PEBS_RESET_FIELD_SIZE 8
+
/* Mask of control bits in the DS MSR register: */
#define BTS_CONTROL \
( ds_cfg.ctl[dsf_bts] | \
@@ -1164,9 +1173,12 @@ const struct pebs_trace *ds_read_pebs(struct pebs_tracer *tracer)
return NULL;
ds_read_config(tracer->ds.context, &tracer->trace.ds, ds_pebs);
- tracer->trace.reset_value =
- *(u64 *)(tracer->ds.context->ds +
- (ds_cfg.sizeof_ptr_field * 8));
+
+ tracer->trace.counters = ds_cfg.nr_counter_reset;
+ memcpy(tracer->trace.counter_reset,
+ tracer->ds.context->ds +
+ (NUM_DS_PTR_FIELDS * ds_cfg.sizeof_ptr_field),
+ ds_cfg.nr_counter_reset * PEBS_RESET_FIELD_SIZE);
return &tracer->trace;
}
@@ -1197,13 +1209,18 @@ int ds_reset_pebs(struct pebs_tracer *tracer)
return 0;
}
-int ds_set_pebs_reset(struct pebs_tracer *tracer, u64 value)
+int ds_set_pebs_reset(struct pebs_tracer *tracer,
+ unsigned int counter, u64 value)
{
if (!tracer)
return -EINVAL;
+ if (ds_cfg.nr_counter_reset < counter)
+ return -EINVAL;
+
*(u64 *)(tracer->ds.context->ds +
- (ds_cfg.sizeof_ptr_field * 8)) = value;
+ (NUM_DS_PTR_FIELDS * ds_cfg.sizeof_ptr_field) +
+ (counter * PEBS_RESET_FIELD_SIZE)) = value;
return 0;
}
@@ -1213,16 +1230,26 @@ static const struct ds_configuration ds_cfg_netburst = {
.ctl[dsf_bts] = (1 << 2) | (1 << 3),
.ctl[dsf_bts_kernel] = (1 << 5),
.ctl[dsf_bts_user] = (1 << 6),
+ .nr_counter_reset = 1,
};
static const struct ds_configuration ds_cfg_pentium_m = {
.name = "Pentium M",
.ctl[dsf_bts] = (1 << 6) | (1 << 7),
+ .nr_counter_reset = 1,
};
static const struct ds_configuration ds_cfg_core2_atom = {
.name = "Core 2/Atom",
.ctl[dsf_bts] = (1 << 6) | (1 << 7),
.ctl[dsf_bts_kernel] = (1 << 9),
.ctl[dsf_bts_user] = (1 << 10),
+ .nr_counter_reset = 1,
+};
+static const struct ds_configuration ds_cfg_core_i7 = {
+ .name = "Core i7",
+ .ctl[dsf_bts] = (1 << 6) | (1 << 7),
+ .ctl[dsf_bts_kernel] = (1 << 9),
+ .ctl[dsf_bts_user] = (1 << 10),
+ .nr_counter_reset = 4,
};
static void
@@ -1239,6 +1266,32 @@ ds_configure(const struct ds_configuration *cfg,
nr_pebs_fields = 18;
#endif
+ /*
+ * Starting with version 2, architectural performance
+ * monitoring supports a format specifier.
+ */
+ if ((cpuid_eax(0xa) & 0xff) > 1) {
+ unsigned long perf_capabilities, format;
+
+ rdmsrl(MSR_IA32_PERF_CAPABILITIES, perf_capabilities);
+
+ format = (perf_capabilities >> 8) & 0xf;
+
+ switch (format) {
+ case 0:
+ nr_pebs_fields = 18;
+ break;
+ case 1:
+ nr_pebs_fields = 22;
+ break;
+ default:
+ printk(KERN_INFO
+ "[ds] unknown PEBS format: %lu\n", format);
+ nr_pebs_fields = 0;
+ break;
+ }
+ }
+
memset(&ds_cfg, 0, sizeof(ds_cfg));
ds_cfg = *cfg;
@@ -1262,7 +1315,7 @@ ds_configure(const struct ds_configuration *cfg,
printk("bts/pebs record: %u/%u bytes\n",
ds_cfg.sizeof_rec[ds_bts], ds_cfg.sizeof_rec[ds_pebs]);
- WARN_ON_ONCE(MAX_SIZEOF_DS < (12 * ds_cfg.sizeof_ptr_field));
+ WARN_ON_ONCE(MAX_PEBS_COUNTERS < ds_cfg.nr_counter_reset);
}
void __cpuinit ds_init_intel(struct cpuinfo_x86 *c)
@@ -1284,6 +1337,8 @@ void __cpuinit ds_init_intel(struct cpuinfo_x86 *c)
ds_configure(&ds_cfg_core2_atom, c);
break;
case 0x1a: /* Core i7 */
+ ds_configure(&ds_cfg_core_i7, c);
+ break;
default:
/* Sorry, don't know about them. */
break;
--
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