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oprofile, x86: Add support for IBS periodic op counter extension 

The count value for IBS op sampling has been extended by 7 bits. The
feature is reflected in bit 6 (OpCntExt) of the IBS capability
register (CPUID Fn8000_001B_EAX).

Signed-off-by: Robert Richter <robert.richter@amd.com>
This commit is contained in:
Robert Richter 2010-09-22 17:45:39 +02:00
parent 25da695047
commit b47fad3bfb
2 changed files with 29 additions and 12 deletions
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19
arch/x86/include/asm/perf_event.h
View File

@ -111,17 +111,18 @@ union cpuid10_edx {
#define X86_PMC_IDX_FIXED_BTS (X86_PMC_IDX_FIXED + 16)
/* IbsFetchCtl bits/masks */
#define IBS_FETCH_RAND_EN (1ULL<<57)
#define IBS_FETCH_VAL (1ULL<<49)
#define IBS_FETCH_ENABLE (1ULL<<48)
#define IBS_FETCH_CNT 0xFFFF0000ULL
#define IBS_FETCH_MAX_CNT 0x0000FFFFULL
#define IBS_FETCH_RAND_EN (1ULL<<57)
#define IBS_FETCH_VAL (1ULL<<49)
#define IBS_FETCH_ENABLE (1ULL<<48)
#define IBS_FETCH_CNT 0xFFFF0000ULL
#define IBS_FETCH_MAX_CNT 0x0000FFFFULL
/* IbsOpCtl bits */
#define IBS_OP_CNT_CTL (1ULL<<19)
#define IBS_OP_VAL (1ULL<<18)
#define IBS_OP_ENABLE (1ULL<<17)
#define IBS_OP_MAX_CNT 0x0000FFFFULL
#define IBS_OP_CNT_CTL (1ULL<<19)
#define IBS_OP_VAL (1ULL<<18)
#define IBS_OP_ENABLE (1ULL<<17)
#define IBS_OP_MAX_CNT 0x0000FFFFULL
#define IBS_OP_MAX_CNT_EXT 0x007FFFFFULL /* not a register bit mask */
#ifdef CONFIG_PERF_EVENTS
extern void init_hw_perf_events(void);

22
arch/x86/oprofile/op_model_amd.c
View File

@ -83,6 +83,7 @@ static struct ibs_state ibs_state;
#define IBS_CAPS_RDWROPCNT (1U<<3)
#define IBS_CAPS_OPCNT (1U<<4)
#define IBS_CAPS_BRNTRGT (1U<<5)
#define IBS_CAPS_OPCNTEXT (1U<<6)
#define IBS_CAPS_DEFAULT (IBS_CAPS_AVAIL \
| IBS_CAPS_FETCHSAM \
@ -246,8 +247,16 @@ static inline void op_amd_start_ibs(void)
memset(&ibs_state, 0, sizeof(ibs_state));
/*
* Note: Since the max count settings may out of range we
* write back the actual used values so that userland can read
* it.
*/
if (ibs_config.fetch_enabled) {
val = (ibs_config.max_cnt_fetch >> 4) & IBS_FETCH_MAX_CNT;
val = ibs_config.max_cnt_fetch >> 4;
val = min(val, IBS_FETCH_MAX_CNT);
ibs_config.max_cnt_fetch = val << 4;
val |= ibs_config.rand_en ? IBS_FETCH_RAND_EN : 0;
val |= IBS_FETCH_ENABLE;
wrmsrl(MSR_AMD64_IBSFETCHCTL, val);
@ -261,6 +270,7 @@ static inline void op_amd_start_ibs(void)
* op_amd_randomize_ibs_op() for details.
*/
val = clamp(val, 0x0081ULL, 0xFF80ULL);
ibs_config.max_cnt_op = val << 4;
} else {
/*
* The start value is randomized with a
@ -268,9 +278,15 @@ static inline void op_amd_start_ibs(void)
* with the half of the randomized range. Also
* avoid underflows.
*/
val = min(val + IBS_RANDOM_MAXCNT_OFFSET,
IBS_OP_MAX_CNT);
val += IBS_RANDOM_MAXCNT_OFFSET;
if (ibs_caps & IBS_CAPS_OPCNTEXT)
val = min(val, IBS_OP_MAX_CNT_EXT);
else
val = min(val, IBS_OP_MAX_CNT);
ibs_config.max_cnt_op =
(val - IBS_RANDOM_MAXCNT_OFFSET) << 4;
}
val = ((val & ~IBS_OP_MAX_CNT) << 4) | (val & IBS_OP_MAX_CNT);
val |= ibs_config.dispatched_ops ? IBS_OP_CNT_CTL : 0;
val |= IBS_OP_ENABLE;
ibs_state.ibs_op_ctl = val;