diff options
| author | Robert Richter <robert.richter@amd.com> | 2010-09-22 17:45:39 +0200 |
|---|---|---|
| committer | Robert Richter <robert.richter@amd.com> | 2010-10-15 12:50:43 +0200 |
| commit | b47fad3bfb5940cc3e28a1c69716f6dc44e4b7e6 (patch) | |
| tree | ac665594dee589c38608f2c24ddb2d2f7a39d201 /arch/x86/oprofile | |
| parent | oprofile, x86: Add support for IBS branch target address reporting (diff) | |
| download | linux-b47fad3bfb5940cc3e28a1c69716f6dc44e4b7e6.tar.xz linux-b47fad3bfb5940cc3e28a1c69716f6dc44e4b7e6.zip | |
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>
Diffstat (limited to 'arch/x86/oprofile')
| -rw-r--r-- | arch/x86/oprofile/op_model_amd.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/arch/x86/oprofile/op_model_amd.c b/arch/x86/oprofile/op_model_amd.c index 9de33fa9531a..65f0a1eb6b86 100644 --- a/arch/x86/oprofile/op_model_amd.c +++ b/arch/x86/oprofile/op_model_amd.c @@ -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; |