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x86/oprofile: add CONFIG_OPROFILE_IBS option

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Signed-off-by: Robert Richter <robert.richter@amd.com>
Cc: oprofile-list <oprofile-list@lists.sourceforge.net>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Barry Kasindorf <barry.kasindorf@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Robert Richter 2008-07-22 21:09:06 +02:00 committed by Ingo Molnar
parent 6aa360e6c1
commit 852402cc27
4 changed files with 47 additions and 10 deletions
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14
arch/Kconfig
View file

@ -13,6 +13,20 @@ config OPROFILE
If unsure, say N.
config OPROFILE_IBS
bool "OProfile AMD IBS support (EXPERIMENTAL)"
default n
depends on OPROFILE && SMP && X86
help
Instruction-Based Sampling (IBS) is a new profiling
technique that provides rich, precise program performance
information. IBS is introduced by AMD Family10h processors
(AMD Opteron Quad-Core processor “Barcelona”) to overcome
the limitations of conventional performance counter
sampling.
If unsure, say N.
config HAVE_OPROFILE
def_bool n

33
arch/x86/oprofile/op_model_athlon.c
View file

@ -47,6 +47,10 @@
#define CTRL_SET_HOST_ONLY(val, h) (val |= ((h & 1) << 9))
#define CTRL_SET_GUEST_ONLY(val, h) (val |= ((h & 1) << 8))
static unsigned long reset_value[NUM_COUNTERS];
#ifdef CONFIG_OPROFILE_IBS
/* IbsFetchCtl bits/masks */
#define IBS_FETCH_HIGH_VALID_BIT (1UL << 17) /* bit 49 */
#define IBS_FETCH_HIGH_ENABLE (1UL << 16) /* bit 48 */
@ -104,7 +108,6 @@ struct ibs_op_sample {
*/
static void clear_ibs_nmi(void);
static unsigned long reset_value[NUM_COUNTERS];
static int ibs_allowed; /* AMD Family10h and later */
struct op_ibs_config {
@ -118,6 +121,8 @@ struct op_ibs_config {
static struct op_ibs_config ibs_config;
#endif
/* functions for op_amd_spec */
static void op_amd_fill_in_addresses(struct op_msrs * const msrs)
@ -188,6 +193,8 @@ static void op_amd_setup_ctrs(struct op_msrs const * const msrs)
}
}
#ifdef CONFIG_OPROFILE_IBS
static inline int
op_amd_handle_ibs(struct pt_regs * const regs,
struct op_msrs const * const msrs)
@ -261,6 +268,8 @@ op_amd_handle_ibs(struct pt_regs * const regs,
return 1;
}
#endif
static int op_amd_check_ctrs(struct pt_regs * const regs,
struct op_msrs const * const msrs)
{
@ -277,7 +286,9 @@ static int op_amd_check_ctrs(struct pt_regs * const regs,
}
}
#ifdef CONFIG_OPROFILE_IBS
op_amd_handle_ibs(regs, msrs);
#endif
/* See op_model_ppro.c */
return 1;
@ -294,6 +305,8 @@ static void op_amd_start(struct op_msrs const * const msrs)
CTRL_WRITE(low, high, msrs, i);
}
}
#ifdef CONFIG_OPROFILE_IBS
if (ibs_allowed && ibs_config.fetch_enabled) {
low = (ibs_config.max_cnt_fetch >> 4) & 0xFFFF;
high = IBS_FETCH_HIGH_ENABLE;
@ -305,6 +318,7 @@ static void op_amd_start(struct op_msrs const * const msrs)
high = 0;
wrmsr(MSR_AMD64_IBSOPCTL, low, high);
}
#endif
}
@ -323,6 +337,7 @@ static void op_amd_stop(struct op_msrs const * const msrs)
CTRL_WRITE(low, high, msrs, i);
}
#ifdef CONFIG_OPROFILE_IBS
if (ibs_allowed && ibs_config.fetch_enabled) {
low = 0; /* clear max count and enable */
high = 0;
@ -334,6 +349,7 @@ static void op_amd_stop(struct op_msrs const * const msrs)
high = 0;
wrmsr(MSR_AMD64_IBSOPCTL, low, high);
}
#endif
}
static void op_amd_shutdown(struct op_msrs const * const msrs)
@ -350,17 +366,10 @@ static void op_amd_shutdown(struct op_msrs const * const msrs)
}
}
#ifndef CONFIG_SMP
#ifndef CONFIG_OPROFILE_IBS
/* no IBS support */
static void setup_ibs(void)
{
ibs_allowed = 0;
}
static void clear_ibs_nmi(void) {}
static int op_amd_init(struct oprofile_operations *ops)
{
return 0;
@ -441,8 +450,12 @@ static void setup_ibs(void)
if (!ibs_allowed)
return;
if (pfm_amd64_setup_eilvt())
if (pfm_amd64_setup_eilvt()) {
ibs_allowed = 0;
return;
}
printk(KERN_INFO "oprofile: AMD IBS detected\n");
}

6
drivers/oprofile/buffer_sync.c
View file

@ -328,6 +328,8 @@ static void add_trace_begin(void)
add_event_entry(TRACE_BEGIN_CODE);
}
#ifdef CONFIG_OPROFILE_IBS
#define IBS_FETCH_CODE_SIZE 2
#define IBS_OP_CODE_SIZE 5
#define IBS_EIP(offset) \
@ -390,6 +392,8 @@ static void add_ibs_begin(struct oprofile_cpu_buffer *cpu_buf, int code,
}
}
#endif
static void add_sample_entry(unsigned long offset, unsigned long event)
{
add_event_entry(offset);
@ -586,6 +590,7 @@ void sync_buffer(int cpu)
} else if (s->event == CPU_TRACE_BEGIN) {
state = sb_bt_start;
add_trace_begin();
#ifdef CONFIG_OPROFILE_IBS
} else if (s->event == IBS_FETCH_BEGIN) {
state = sb_bt_start;
add_ibs_begin(cpu_buf,
@ -594,6 +599,7 @@ void sync_buffer(int cpu)
state = sb_bt_start;
add_ibs_begin(cpu_buf,
IBS_OP_CODE, in_kernel, mm);
#endif
} else {
struct mm_struct *oldmm = mm;

4
drivers/oprofile/cpu_buffer.c
View file

@ -253,6 +253,8 @@ void oprofile_add_sample(struct pt_regs * const regs, unsigned long event)
oprofile_add_ext_sample(pc, regs, event, is_kernel);
}
#ifdef CONFIG_OPROFILE_IBS
#define MAX_IBS_SAMPLE_SIZE 14
static int log_ibs_sample(struct oprofile_cpu_buffer *cpu_buf,
unsigned long pc, int is_kernel, unsigned int *ibs, int ibs_code)
@ -318,6 +320,8 @@ void oprofile_add_ibs_sample(struct pt_regs *const regs,
oprofile_ops.backtrace(regs, backtrace_depth);
}
#endif
void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event)
{
struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(cpu_buffer);