Messages in this thread Patch in this message | | | From | Ravi Bangoria <> | Subject | [PATCH v2 03/14] perf/x86/amd: Support PERF_SAMPLE_DATA_SRC | Date | Thu, 16 Jun 2022 17:06:26 +0530 |
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struct perf_mem_data_src is used to pass arch specific memory access details into generic form. These details gets consumed by tools like perf mem and c2c. IBS tagged load/store sample provides most of the information needed for these tools. Add a logic to convert IBS specific raw data into perf_mem_data_src.
Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com> --- arch/x86/events/amd/ibs.c | 302 +++++++++++++++++++++++++++++++++++++- 1 file changed, 296 insertions(+), 6 deletions(-)
diff --git a/arch/x86/events/amd/ibs.c b/arch/x86/events/amd/ibs.c index c251bc44c088..de2632a2e44d 100644 --- a/arch/x86/events/amd/ibs.c +++ b/arch/x86/events/amd/ibs.c @@ -688,6 +688,294 @@ static struct perf_ibs perf_ibs_op = { .get_count = get_ibs_op_count, }; +static void perf_ibs_get_mem_op(union ibs_op_data3 *op_data3, + struct perf_sample_data *data) +{ + union perf_mem_data_src *data_src = &data->data_src; + + data_src->mem_op = PERF_MEM_OP_NA; + + if (op_data3->ld_op) + data_src->mem_op = PERF_MEM_OP_LOAD; + else if (op_data3->st_op) + data_src->mem_op = PERF_MEM_OP_STORE; +} + +/* + * Processors having CPUID_Fn8000001B_EAX[11] aka IBS_CAPS_ZEN4 has + * more fine granular DataSrc encodings. Others have coarse. + */ +static u8 perf_ibs_data_src(union ibs_op_data2 *op_data2) +{ + if (ibs_caps & IBS_CAPS_ZEN4) + return (op_data2->data_src_hi << 3) | op_data2->data_src_lo; + + return op_data2->data_src_lo; +} + +static void perf_ibs_get_mem_lvl(struct perf_event *event, + union ibs_op_data2 *op_data2, + union ibs_op_data3 *op_data3, + struct perf_sample_data *data) +{ + union perf_mem_data_src *data_src = &data->data_src; + u8 ibs_data_src = perf_ibs_data_src(op_data2); + + data_src->mem_lvl = 0; + + /* + * DcMiss, L2Miss, DataSrc, DcMissLat etc. are all invalid for Uncached + * memory accesses. So, check DcUcMemAcc bit early. + */ + if (op_data3->dc_uc_mem_acc && ibs_data_src != IBS_DATA_SRC_EXT_IO) { + data_src->mem_lvl = PERF_MEM_LVL_UNC | PERF_MEM_LVL_HIT; + return; + } + + /* L1 Hit */ + if (op_data3->dc_miss == 0) { + data_src->mem_lvl = PERF_MEM_LVL_L1 | PERF_MEM_LVL_HIT; + return; + } + + /* L2 Hit */ + if (op_data3->l2_miss == 0) { + /* Erratum #1293 */ + if (boot_cpu_data.x86 != 0x19 || boot_cpu_data.x86_model > 0xF || + !(op_data3->sw_pf || op_data3->dc_miss_no_mab_alloc)) { + data_src->mem_lvl = PERF_MEM_LVL_L2 | PERF_MEM_LVL_HIT; + return; + } + } + + /* L3 Hit */ + if (ibs_caps & IBS_CAPS_ZEN4) { + if (data_src->mem_op == PERF_MEM_OP_LOAD && + ibs_data_src == IBS_DATA_SRC_EXT_LOC_CACHE) { + data_src->mem_lvl = PERF_MEM_LVL_L3 | PERF_MEM_LVL_HIT; + return; + } + } else { + if (data_src->mem_op == PERF_MEM_OP_LOAD && + ibs_data_src == IBS_DATA_SRC_LOC_CACHE) { + data_src->mem_lvl = PERF_MEM_LVL_L3 | PERF_MEM_LVL_REM_CCE1 | + PERF_MEM_LVL_HIT; + return; + } + } + + /* A peer cache in a near CCX. */ + if (ibs_caps & IBS_CAPS_ZEN4 && data_src->mem_op == PERF_MEM_OP_LOAD && + ibs_data_src == IBS_DATA_SRC_EXT_NEAR_CCX_CACHE) { + data_src->mem_lvl = PERF_MEM_LVL_REM_CCE1 | PERF_MEM_LVL_HIT; + return; + } + + /* A peer cache in a far CCX. */ + if (ibs_caps & IBS_CAPS_ZEN4) { + if (data_src->mem_op == PERF_MEM_OP_LOAD && + ibs_data_src == IBS_DATA_SRC_EXT_FAR_CCX_CACHE) { + data_src->mem_lvl = PERF_MEM_LVL_REM_CCE2 | PERF_MEM_LVL_HIT; + return; + } + } else { + if (data_src->mem_op == PERF_MEM_OP_LOAD && + ibs_data_src == IBS_DATA_SRC_REM_CACHE) { + data_src->mem_lvl = PERF_MEM_LVL_REM_CCE2 | PERF_MEM_LVL_HIT; + return; + } + } + + /* DRAM */ + if (data_src->mem_op == PERF_MEM_OP_LOAD && + ibs_data_src == IBS_DATA_SRC_EXT_DRAM) { + if (op_data2->rmt_node == 0) + data_src->mem_lvl = PERF_MEM_LVL_LOC_RAM | PERF_MEM_LVL_HIT; + else + data_src->mem_lvl = PERF_MEM_LVL_REM_RAM1 | PERF_MEM_LVL_HIT; + return; + } + + /* PMEM */ + if (ibs_caps & IBS_CAPS_ZEN4 && data_src->mem_op == PERF_MEM_OP_LOAD && + ibs_data_src == IBS_DATA_SRC_EXT_PMEM) { + data_src->mem_lvl_num = PERF_MEM_LVLNUM_PMEM; + if (op_data2->rmt_node) { + data_src->mem_remote = PERF_MEM_REMOTE_REMOTE; + /* IBS doesn't provide Remote socket detail */ + data_src->mem_hops = PERF_MEM_HOPS_1; + } + return; + } + + /* Extension Memory */ + if (ibs_caps & IBS_CAPS_ZEN4 && data_src->mem_op == PERF_MEM_OP_LOAD && + ibs_data_src == IBS_DATA_SRC_EXT_EXT_MEM) { + data_src->mem_lvl_num = PERF_MEM_LVLNUM_EXTN_MEM; + if (op_data2->rmt_node) { + data_src->mem_remote = PERF_MEM_REMOTE_REMOTE; + /* IBS doesn't provide Remote socket detail */ + data_src->mem_hops = PERF_MEM_HOPS_1; + } + return; + } + + /* IO */ + if (data_src->mem_op == PERF_MEM_OP_LOAD && + ibs_data_src == IBS_DATA_SRC_EXT_IO) { + data_src->mem_lvl = PERF_MEM_LVL_IO; + data_src->mem_lvl_num = PERF_MEM_LVLNUM_IO; + if (op_data2->rmt_node) { + data_src->mem_remote = PERF_MEM_REMOTE_REMOTE; + /* IBS doesn't provide Remote socket detail */ + data_src->mem_hops = PERF_MEM_HOPS_1; + } + return; + } + + /* + * MAB (Miss Address Buffer) Hit. MAB keeps track of outstanding + * DC misses. However such data may come from any level in mem + * hierarchy. IBS provides detail about both MAB as well as actual + * DataSrc simultaneously. Prioritize DataSrc over MAB, i.e. set + * MAB only when IBS fails to provide DataSrc. + */ + if (op_data3->dc_miss_no_mab_alloc) { + data_src->mem_lvl = PERF_MEM_LVL_LFB | PERF_MEM_LVL_HIT; + return; + } + + data_src->mem_lvl = PERF_MEM_LVL_NA; +} + +static bool perf_ibs_cache_hit_st_valid(void) +{ + /* 0: Uninitialized, 1: Valid, -1: Invalid */ + static int cache_hit_st_valid; + + if (unlikely(!cache_hit_st_valid)) { + if (boot_cpu_data.x86 == 0x19 && + (boot_cpu_data.x86_model <= 0xF || + (boot_cpu_data.x86_model >= 0x20 && + boot_cpu_data.x86_model <= 0x5F))) { + cache_hit_st_valid = -1; + } else { + cache_hit_st_valid = 1; + } + } + + return cache_hit_st_valid == 1; +} + +static void perf_ibs_get_mem_snoop(union ibs_op_data2 *op_data2, + struct perf_sample_data *data) +{ + union perf_mem_data_src *data_src = &data->data_src; + u8 ibs_data_src; + + data_src->mem_snoop = PERF_MEM_SNOOP_NA; + + if (!perf_ibs_cache_hit_st_valid() || + data_src->mem_op != PERF_MEM_OP_LOAD || + data_src->mem_lvl & PERF_MEM_LVL_L1 || + data_src->mem_lvl & PERF_MEM_LVL_L2 || + op_data2->cache_hit_st) + return; + + ibs_data_src = perf_ibs_data_src(op_data2); + + if (ibs_caps & IBS_CAPS_ZEN4) { + if (ibs_data_src == IBS_DATA_SRC_EXT_LOC_CACHE || + ibs_data_src == IBS_DATA_SRC_EXT_NEAR_CCX_CACHE || + ibs_data_src == IBS_DATA_SRC_EXT_FAR_CCX_CACHE) + data_src->mem_snoop = PERF_MEM_SNOOP_HITM; + } else if (ibs_data_src == IBS_DATA_SRC_LOC_CACHE) { + data_src->mem_snoop = PERF_MEM_SNOOP_HITM; + } +} + +static void perf_ibs_get_tlb_lvl(union ibs_op_data3 *op_data3, + struct perf_sample_data *data) +{ + union perf_mem_data_src *data_src = &data->data_src; + + data_src->mem_dtlb = PERF_MEM_TLB_NA; + + if (!op_data3->dc_lin_addr_valid) + return; + + if (!op_data3->dc_l1tlb_miss) { + data_src->mem_dtlb = PERF_MEM_TLB_L1 | PERF_MEM_TLB_HIT; + return; + } + + if (!op_data3->dc_l2tlb_miss) { + data_src->mem_dtlb = PERF_MEM_TLB_L2 | PERF_MEM_TLB_HIT; + return; + } + + data_src->mem_dtlb = PERF_MEM_TLB_L2 | PERF_MEM_TLB_MISS; +} + +static void perf_ibs_get_mem_lock(union ibs_op_data3 *op_data3, + struct perf_sample_data *data) +{ + union perf_mem_data_src *data_src = &data->data_src; + + data_src->mem_lock = PERF_MEM_LOCK_NA; + + if (op_data3->dc_locked_op) + data_src->mem_lock = PERF_MEM_LOCK_LOCKED; +} + +#define ibs_op_msr_idx(msr) (msr - MSR_AMD64_IBSOPCTL) + +static void perf_ibs_get_data_src(struct perf_event *event, + struct perf_ibs_data *ibs_data, + struct perf_sample_data *data) +{ + union perf_mem_data_src *data_src = &data->data_src; + union ibs_op_data2 op_data2; + union ibs_op_data3 op_data3; + + op_data3.val = ibs_data->regs[ibs_op_msr_idx(MSR_AMD64_IBSOPDATA3)]; + + perf_ibs_get_mem_op(&op_data3, data); + if (data_src->mem_op != PERF_MEM_OP_LOAD && + data_src->mem_op != PERF_MEM_OP_STORE) + return; + + op_data2.val = ibs_data->regs[ibs_op_msr_idx(MSR_AMD64_IBSOPDATA2)]; + + /* Erratum #1293 */ + if (boot_cpu_data.x86 == 0x19 && boot_cpu_data.x86_model <= 0xF && + (op_data3.sw_pf || op_data3.dc_miss_no_mab_alloc)) { + /* + * OP_DATA2 has only two fields on Zen3: DataSrc and RmtNode. + * DataSrc=0 is No valid status and RmtNode is invalid when + * DataSrc=0. + */ + op_data2.val = 0; + } + + perf_ibs_get_mem_lvl(event, &op_data2, &op_data3, data); + perf_ibs_get_mem_snoop(&op_data2, data); + perf_ibs_get_tlb_lvl(&op_data3, data); + perf_ibs_get_mem_lock(&op_data3, data); +} + +static int perf_ibs_get_offset_max(struct perf_ibs *perf_ibs, u64 sample_type, + int check_rip) +{ + if (sample_type & PERF_SAMPLE_RAW || + (perf_ibs == &perf_ibs_op && + sample_type & PERF_SAMPLE_DATA_SRC)) + return perf_ibs->offset_max; + else if (check_rip) + return 3; + return 1; +} + static int perf_ibs_handle_irq(struct perf_ibs *perf_ibs, struct pt_regs *iregs) { struct cpu_perf_ibs *pcpu = this_cpu_ptr(perf_ibs->pcpu); @@ -735,12 +1023,9 @@ static int perf_ibs_handle_irq(struct perf_ibs *perf_ibs, struct pt_regs *iregs) size = 1; offset = 1; check_rip = (perf_ibs == &perf_ibs_op && (ibs_caps & IBS_CAPS_RIPINVALIDCHK)); - if (event->attr.sample_type & PERF_SAMPLE_RAW) - offset_max = perf_ibs->offset_max; - else if (check_rip) - offset_max = 3; - else - offset_max = 1; + + offset_max = perf_ibs_get_offset_max(perf_ibs, event->attr.sample_type, check_rip); + do { rdmsrl(msr + offset, *buf++); size++; @@ -793,6 +1078,11 @@ static int perf_ibs_handle_irq(struct perf_ibs *perf_ibs, struct pt_regs *iregs) data.raw = &raw; } + if (perf_ibs == &perf_ibs_op) { + if (event->attr.sample_type & PERF_SAMPLE_DATA_SRC) + perf_ibs_get_data_src(event, &ibs_data, &data); + } + /* * rip recorded by IbsOpRip will not be consistent with rsp and rbp * recorded as part of interrupt regs. Thus we need to use rip from -- 2.31.1
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