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oprofile/x86: reserve counter msrs pairwise

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For AMD's and Intel's P6 generic performance counters have pairwise
counter and control msrs. This patch changes the counter reservation
in a way that both msrs must be registered. It joins some counter
loops and also removes the unnecessary NUM_CONTROLS macro in the AMD
implementation.

Signed-off-by: Robert Richter <robert.richter@amd.com>
This commit is contained in:
Robert Richter 2010-03-23 19:33:21 +01:00
parent 8f5a2dd83a
commit d0e4120fda
2 changed files with 36 additions and 43 deletions
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35
arch/x86/oprofile/op_model_amd.c
View File

@ -30,13 +30,10 @@
#include "op_counter.h"
#define NUM_COUNTERS 4
#define NUM_CONTROLS 4
#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
#define NUM_VIRT_COUNTERS 32
#define NUM_VIRT_CONTROLS 32
#else
#define NUM_VIRT_COUNTERS NUM_COUNTERS
#define NUM_VIRT_CONTROLS NUM_CONTROLS
#endif
#define OP_EVENT_MASK 0x0FFF
@ -134,12 +131,14 @@ static void op_amd_fill_in_addresses(struct op_msrs * const msrs)
int i;
for (i = 0; i < NUM_COUNTERS; i++) {
if (reserve_perfctr_nmi(MSR_K7_PERFCTR0 + i))
msrs->counters[i].addr = MSR_K7_PERFCTR0 + i;
if (!reserve_perfctr_nmi(MSR_K7_PERFCTR0 + i))
continue;
if (!reserve_evntsel_nmi(MSR_K7_EVNTSEL0 + i)) {
release_perfctr_nmi(MSR_K7_PERFCTR0 + i);
continue;
}
for (i = 0; i < NUM_CONTROLS; i++) {
if (reserve_evntsel_nmi(MSR_K7_EVNTSEL0 + i))
/* both registers must be reserved */
msrs->counters[i].addr = MSR_K7_PERFCTR0 + i;
msrs->controls[i].addr = MSR_K7_EVNTSEL0 + i;
}
}
@ -160,7 +159,7 @@ static void op_amd_setup_ctrs(struct op_x86_model_spec const *model,
}
/* clear all counters */
for (i = 0; i < NUM_CONTROLS; ++i) {
for (i = 0; i < NUM_COUNTERS; ++i) {
if (unlikely(!msrs->controls[i].addr)) {
if (counter_config[i].enabled && !smp_processor_id())
/*
@ -175,12 +174,10 @@ static void op_amd_setup_ctrs(struct op_x86_model_spec const *model,
op_x86_warn_in_use(i);
val &= model->reserved;
wrmsrl(msrs->controls[i].addr, val);
}
/* avoid a false detection of ctr overflows in NMI handler */
for (i = 0; i < NUM_COUNTERS; ++i) {
if (unlikely(!msrs->counters[i].addr))
continue;
/*
* avoid a false detection of ctr overflows in NMI
* handler
*/
wrmsrl(msrs->counters[i].addr, -1LL);
}
@ -430,11 +427,9 @@ static void op_amd_shutdown(struct op_msrs const * const msrs)
int i;
for (i = 0; i < NUM_COUNTERS; ++i) {
if (msrs->counters[i].addr)
if (!msrs->counters[i].addr)
continue;
release_perfctr_nmi(MSR_K7_PERFCTR0 + i);
}
for (i = 0; i < NUM_CONTROLS; ++i) {
if (msrs->controls[i].addr)
release_evntsel_nmi(MSR_K7_EVNTSEL0 + i);
}
}
@ -583,7 +578,7 @@ static void op_amd_exit(void)
struct op_x86_model_spec op_amd_spec = {
.num_counters = NUM_COUNTERS,
.num_controls = NUM_CONTROLS,
.num_controls = NUM_COUNTERS,
.num_virt_counters = NUM_VIRT_COUNTERS,
.reserved = MSR_AMD_EVENTSEL_RESERVED,
.event_mask = OP_EVENT_MASK,

28
arch/x86/oprofile/op_model_ppro.c
View File

@ -35,12 +35,14 @@ static void ppro_fill_in_addresses(struct op_msrs * const msrs)
int i;
for (i = 0; i < num_counters; i++) {
if (reserve_perfctr_nmi(MSR_P6_PERFCTR0 + i))
msrs->counters[i].addr = MSR_P6_PERFCTR0 + i;
if (!reserve_perfctr_nmi(MSR_P6_PERFCTR0 + i))
continue;
if (!reserve_evntsel_nmi(MSR_P6_EVNTSEL0 + i)) {
release_perfctr_nmi(MSR_P6_PERFCTR0 + i);
continue;
}
for (i = 0; i < num_counters; i++) {
if (reserve_evntsel_nmi(MSR_P6_EVNTSEL0 + i))
/* both registers must be reserved */
msrs->counters[i].addr = MSR_P6_PERFCTR0 + i;
msrs->controls[i].addr = MSR_P6_EVNTSEL0 + i;
}
}
@ -92,12 +94,10 @@ static void ppro_setup_ctrs(struct op_x86_model_spec const *model,
op_x86_warn_in_use(i);
val &= model->reserved;
wrmsrl(msrs->controls[i].addr, val);
}
/* avoid a false detection of ctr overflows in NMI handler */
for (i = 0; i < num_counters; ++i) {
if (unlikely(!msrs->counters[i].addr))
continue;
/*
* avoid a false detection of ctr overflows in NMI *
* handler
*/
wrmsrl(msrs->counters[i].addr, -1LL);
}
@ -194,11 +194,9 @@ static void ppro_shutdown(struct op_msrs const * const msrs)
int i;
for (i = 0; i < num_counters; ++i) {
if (msrs->counters[i].addr)
if (!msrs->counters[i].addr)
continue;
release_perfctr_nmi(MSR_P6_PERFCTR0 + i);
}
for (i = 0; i < num_counters; ++i) {
if (msrs->controls[i].addr)
release_evntsel_nmi(MSR_P6_EVNTSEL0 + i);
}
if (reset_value) {