Quelle  amd-sample-raw.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
 * AMD specific. Provide textual annotation for IBS raw sample data.
 */

#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>

#include <linux/string.h>
#include "../../arch/x86/include/asm/amd/ibs.h"

#include "debug.h"
#include "session.h"
#include "evlist.h"
#include "sample-raw.h"
#include "util/sample.h"

static u32 cpu_family, cpu_model, ibs_fetch_type, ibs_op_type;
static bool zen4_ibs_extensions;
static bool ldlat_cap;
static bool dtlb_pgsize_cap;

static void pr_ibs_fetch_ctl(union ibs_fetch_ctl reg)
{
 const char * const ic_miss_strs[] = {
  " IcMiss 0",
  " IcMiss 1",
 };
 const char * const l1tlb_pgsz_strs[] = {
  " L1TlbPgSz 4KB",
  " L1TlbPgSz 2MB",
  " L1TlbPgSz 1GB",
  " L1TlbPgSz RESERVED"
 };
 const char * const l1tlb_pgsz_strs_erratum1347[] = {
  " L1TlbPgSz 4KB",
  " L1TlbPgSz 16KB",
  " L1TlbPgSz 2MB",
  " L1TlbPgSz 1GB"
 };
 const char *ic_miss_str = NULL;
 const char *l1tlb_pgsz_str = NULL;
 char l3_miss_str[sizeof(" L3MissOnly _ FetchOcMiss _ FetchL3Miss _")] = "";

 if (cpu_family == 0x19 && cpu_model < 0x10) {
  /*
 * Erratum #1238 workaround is to ignore MSRC001_1030[IbsIcMiss]
 * Erratum #1347 workaround is to use table provided in erratum
 */
  if (reg.phy_addr_valid)
   l1tlb_pgsz_str = l1tlb_pgsz_strs_erratum1347[reg.l1tlb_pgsz];
 } else {
  if (reg.phy_addr_valid)
   l1tlb_pgsz_str = l1tlb_pgsz_strs[reg.l1tlb_pgsz];
  ic_miss_str = ic_miss_strs[reg.ic_miss];
 }

 if (zen4_ibs_extensions) {
  snprintf(l3_miss_str, sizeof(l3_miss_str),
    " L3MissOnly %d FetchOcMiss %d FetchL3Miss %d",
    reg.l3_miss_only, reg.fetch_oc_miss, reg.fetch_l3_miss);
 }

 printf("ibs_fetch_ctl:\t%016llx MaxCnt %7d Cnt %7d Lat %5d En %d Val %d Comp %d%s "
  "PhyAddrValid %d%s L1TlbMiss %d L2TlbMiss %d RandEn %d%s%s\n",
  reg.val, reg.fetch_maxcnt << 4, reg.fetch_cnt << 4, reg.fetch_lat,
  reg.fetch_en, reg.fetch_val, reg.fetch_comp, ic_miss_str ? : "",
  reg.phy_addr_valid, l1tlb_pgsz_str ? : "", reg.l1tlb_miss, reg.l2tlb_miss,
  reg.rand_en, reg.fetch_comp ? (reg.fetch_l2_miss ? " L2Miss 1" : " L2Miss 0") : "",
  l3_miss_str);
}

static void pr_ic_ibs_extd_ctl(union ic_ibs_extd_ctl reg)
{
 printf("ic_ibs_ext_ctl:\t%016llx IbsItlbRefillLat %3d\n", reg.val, reg.itlb_refill_lat);
}

static void pr_ibs_op_ctl(union ibs_op_ctl reg)
{
 char l3_miss_only[sizeof(" L3MissOnly _")] = "";
 char ldlat[sizeof(" LdLatThrsh __ LdLatEn _")] = "";

 if (zen4_ibs_extensions)
  snprintf(l3_miss_only, sizeof(l3_miss_only), " L3MissOnly %d", reg.l3_miss_only);

 if (ldlat_cap) {
  snprintf(ldlat, sizeof(ldlat), " LdLatThrsh %2d LdLatEn %d",
    reg.ldlat_thrsh, reg.ldlat_en);
 }

 printf("ibs_op_ctl:\t%016llx MaxCnt %9d%s En %d Val %d CntCtl %d=%s CurCnt %9d%s\n",
  reg.val, ((reg.opmaxcnt_ext << 16) | reg.opmaxcnt) << 4, l3_miss_only,
  reg.op_en, reg.op_val, reg.cnt_ctl,
  reg.cnt_ctl ? "uOps" : "cycles", reg.opcurcnt, ldlat);
}

static void pr_ibs_op_data(union ibs_op_data reg)
{
 printf("ibs_op_data:\t%016llx CompToRetCtr %5d TagToRetCtr %5d%s%s%s BrnRet %d "
  " RipInvalid %d BrnFuse %d Microcode %d\n",
  reg.val, reg.comp_to_ret_ctr, reg.tag_to_ret_ctr,
  reg.op_brn_ret ? (reg.op_return ? " OpReturn 1" : " OpReturn 0") : "",
  reg.op_brn_ret ? (reg.op_brn_taken ? " OpBrnTaken 1" : " OpBrnTaken 0") : "",
  reg.op_brn_ret ? (reg.op_brn_misp ? " OpBrnMisp 1" : " OpBrnMisp 0") : "",
  reg.op_brn_ret, reg.op_rip_invalid, reg.op_brn_fuse, reg.op_microcode);
}

static void pr_ibs_op_data2_extended(union ibs_op_data2 reg)
{
 static const char * const data_src_str[] = {
  "",
  " DataSrc 1=Local L3 or other L1/L2 in CCX",
  " DataSrc 2=Another CCX cache in the same NUMA node",
  " DataSrc 3=DRAM",
  " DataSrc 4=(reserved)",
  " DataSrc 5=Another CCX cache in a different NUMA node",
  " DataSrc 6=Long-latency DIMM",
  " DataSrc 7=MMIO/Config/PCI/APIC",
  " DataSrc 8=Extension Memory",
  " DataSrc 9=(reserved)",
  " DataSrc 10=(reserved)",
  " DataSrc 11=(reserved)",
  " DataSrc 12=Coherent Memory of a different processor type",
  /* 13 to 31 are reserved. Avoid printing them. */
 };
 int data_src = (reg.data_src_hi << 3) | reg.data_src_lo;

 printf("ibs_op_data2:\t%016llx %sRmtNode %d%s\n", reg.val,
  (data_src == 1 || data_src == 2 || data_src == 5) ?
   (reg.cache_hit_st ? "CacheHitSt 1=O-State " : "CacheHitSt 0=M-state ") : "",
  reg.rmt_node,
  data_src < (int)ARRAY_SIZE(data_src_str) ? data_src_str[data_src] : "");
}

static void pr_ibs_op_data2_default(union ibs_op_data2 reg)
{
 static const char * const data_src_str[] = {
  "",
  " DataSrc 1=(reserved)",
  " DataSrc 2=Local node cache",
  " DataSrc 3=DRAM",
  " DataSrc 4=Remote node cache",
  " DataSrc 5=(reserved)",
  " DataSrc 6=(reserved)",
  " DataSrc 7=Other"
 };

 printf("ibs_op_data2:\t%016llx %sRmtNode %d%s\n", reg.val,
        reg.data_src_lo == 2 ? (reg.cache_hit_st ? "CacheHitSt 1=O-State "
           : "CacheHitSt 0=M-state ") : "",
        reg.rmt_node, data_src_str[reg.data_src_lo]);
}

static void pr_ibs_op_data2(union ibs_op_data2 reg)
{
 if (zen4_ibs_extensions)
  return pr_ibs_op_data2_extended(reg);
 pr_ibs_op_data2_default(reg);
}

static void pr_ibs_op_data3(union ibs_op_data3 reg)
{
 static const char * const dc_page_sizes[] = {
  " 4K",
  " 2M",
  " 1G",
  " ??",
 };
 char op_dc_miss_open_mem_reqs_str[sizeof(" OpDcMissOpenMemReqs __")] = "";
 char dc_l1_l2tlb_miss_str[sizeof(" DcL1TlbMiss _ DcL2TlbMiss _")] = "";
 char dc_l1tlb_hit_str[sizeof(" DcL1TlbHit2M _ DcL1TlbHit1G _")] = "";
 char op_mem_width_str[sizeof(" OpMemWidth _____ bytes")] = "";
 char dc_l2tlb_hit_2m_str[sizeof(" DcL2TlbHit2M _")] = "";
 char dc_l2tlb_hit_1g_str[sizeof(" DcL2TlbHit1G _")] = "";
 char dc_page_size_str[sizeof(" DcPageSize ____")] = "";
 char l2_miss_str[sizeof(" L2Miss _")] = "";

 /*
 * Erratum #1293
 * Ignore L2Miss and OpDcMissOpenMemReqs (and opdata2) if DcMissNoMabAlloc or SwPf set
 */
 if (!(cpu_family == 0x19 && cpu_model < 0x10 && (reg.dc_miss_no_mab_alloc || reg.sw_pf))) {
  snprintf(l2_miss_str, sizeof(l2_miss_str), " L2Miss %d", reg.l2_miss);
  snprintf(op_dc_miss_open_mem_reqs_str, sizeof(op_dc_miss_open_mem_reqs_str),
    " OpDcMissOpenMemReqs %2d", reg.op_dc_miss_open_mem_reqs);
 }

 if (reg.op_mem_width)
  snprintf(op_mem_width_str, sizeof(op_mem_width_str),
    " OpMemWidth %2d bytes", 1 << (reg.op_mem_width - 1));

 if (dtlb_pgsize_cap) {
  if (reg.dc_phy_addr_valid) {
   int idx = (reg.dc_l1tlb_hit_1g << 1) | reg.dc_l1tlb_hit_2m;

   snprintf(dc_l1_l2tlb_miss_str, sizeof(dc_l1_l2tlb_miss_str),
     " DcL1TlbMiss %d DcL2TlbMiss %d",
     reg.dc_l1tlb_miss, reg.dc_l2tlb_miss);
   snprintf(dc_page_size_str, sizeof(dc_page_size_str),
     " DcPageSize %4s", dc_page_sizes[idx]);
  }
 } else {
  snprintf(dc_l1_l2tlb_miss_str, sizeof(dc_l1_l2tlb_miss_str),
    " DcL1TlbMiss %d DcL2TlbMiss %d",
    reg.dc_l1tlb_miss, reg.dc_l2tlb_miss);
  snprintf(dc_l1tlb_hit_str, sizeof(dc_l1tlb_hit_str),
    " DcL1TlbHit2M %d DcL1TlbHit1G %d",
    reg.dc_l1tlb_hit_2m, reg.dc_l1tlb_hit_1g);
  snprintf(dc_l2tlb_hit_2m_str, sizeof(dc_l2tlb_hit_2m_str),
    " DcL2TlbHit2M %d", reg.dc_l2tlb_hit_2m);
  snprintf(dc_l2tlb_hit_1g_str, sizeof(dc_l2tlb_hit_1g_str),
    " DcL2TlbHit1G %d", reg.dc_l2_tlb_hit_1g);
 }

 printf("ibs_op_data3:\t%016llx LdOp %d StOp %d%s%s%s DcMiss %d DcMisAcc %d "
  "DcWcMemAcc %d DcUcMemAcc %d DcLockedOp %d DcMissNoMabAlloc %d "
  "DcLinAddrValid %d DcPhyAddrValid %d%s%s SwPf %d%s%s "
  "DcMissLat %5d TlbRefillLat %5d\n",
  reg.val, reg.ld_op, reg.st_op, dc_l1_l2tlb_miss_str,
  dtlb_pgsize_cap ? dc_page_size_str : dc_l1tlb_hit_str,
  dc_l2tlb_hit_2m_str, reg.dc_miss, reg.dc_mis_acc, reg.dc_wc_mem_acc,
  reg.dc_uc_mem_acc, reg.dc_locked_op, reg.dc_miss_no_mab_alloc,
  reg.dc_lin_addr_valid, reg.dc_phy_addr_valid, dc_l2tlb_hit_1g_str,
  l2_miss_str, reg.sw_pf, op_mem_width_str, op_dc_miss_open_mem_reqs_str,
  reg.dc_miss_lat, reg.tlb_refill_lat);
}

/*
 * IBS Op/Execution MSRs always saved, in order, are:
 * IBS_OP_CTL, IBS_OP_RIP, IBS_OP_DATA, IBS_OP_DATA2,
 * IBS_OP_DATA3, IBS_DC_LINADDR, IBS_DC_PHYSADDR, BP_IBSTGT_RIP
 */
static void amd_dump_ibs_op(struct perf_sample *sample)
{
 struct perf_ibs_data *data = sample->raw_data;
 union ibs_op_ctl *op_ctl = (union ibs_op_ctl *)data->data;
 __u64 *rip = (__u64 *)op_ctl + 1;
 union ibs_op_data *op_data = (union ibs_op_data *)(rip + 1);
 union ibs_op_data3 *op_data3 = (union ibs_op_data3 *)(rip + 3);

 pr_ibs_op_ctl(*op_ctl);
 if (!op_data->op_rip_invalid)
  printf("IbsOpRip:\t%016llx\n", *rip);
 pr_ibs_op_data(*op_data);
 /*
 * Erratum #1293: ignore op_data2 if DcMissNoMabAlloc or SwPf are set
 */
 if (!(cpu_family == 0x19 && cpu_model < 0x10 &&
       (op_data3->dc_miss_no_mab_alloc || op_data3->sw_pf)))
  pr_ibs_op_data2(*(union ibs_op_data2 *)(rip + 2));
 pr_ibs_op_data3(*op_data3);
 if (op_data3->dc_lin_addr_valid)
  printf("IbsDCLinAd:\t%016llx\n", *(rip + 4));
 if (op_data3->dc_phy_addr_valid)
  printf("IbsDCPhysAd:\t%016llx\n", *(rip + 5));
 if (op_data->op_brn_ret && *(rip + 6))
  printf("IbsBrTarget:\t%016llx\n", *(rip + 6));
}

/*
 * IBS Fetch MSRs always saved, in order, are:
 * IBS_FETCH_CTL, IBS_FETCH_LINADDR, IBS_FETCH_PHYSADDR, IC_IBS_EXTD_CTL
 */
static void amd_dump_ibs_fetch(struct perf_sample *sample)
{
 struct perf_ibs_data *data = sample->raw_data;
 union ibs_fetch_ctl *fetch_ctl = (union ibs_fetch_ctl *)data->data;
 __u64 *addr = (__u64 *)fetch_ctl + 1;
 union ic_ibs_extd_ctl *extd_ctl = (union ic_ibs_extd_ctl *)addr + 2;

 pr_ibs_fetch_ctl(*fetch_ctl);
 printf("IbsFetchLinAd:\t%016llx\n", *addr++);
 if (fetch_ctl->phy_addr_valid)
  printf("IbsFetchPhysAd:\t%016llx\n", *addr);
 pr_ic_ibs_extd_ctl(*extd_ctl);
}

/*
 * Test for enable and valid bits in captured control MSRs.
 */
static bool is_valid_ibs_fetch_sample(struct perf_sample *sample)
{
 struct perf_ibs_data *data = sample->raw_data;
 union ibs_fetch_ctl *fetch_ctl = (union ibs_fetch_ctl *)data->data;

 if (fetch_ctl->fetch_en && fetch_ctl->fetch_val)
  return true;

 return false;
}

static bool is_valid_ibs_op_sample(struct perf_sample *sample)
{
 struct perf_ibs_data *data = sample->raw_data;
 union ibs_op_ctl *op_ctl = (union ibs_op_ctl *)data->data;

 if (op_ctl->op_en && op_ctl->op_val)
  return true;

 return false;
}

/* AMD vendor specific raw sample function. Check for PERF_RECORD_SAMPLE events
 * and if the event was triggered by IBS, display its raw data with decoded text.
 * The function is only invoked when the dump flag -D is set.
 */
void evlist__amd_sample_raw(struct evlist *evlist, union perf_event *event,
       struct perf_sample *sample)
{
 struct evsel *evsel;

 if (event->header.type != PERF_RECORD_SAMPLE || !sample->raw_size)
  return;

 evsel = evlist__event2evsel(evlist, event);
 if (!evsel)
  return;

 if (evsel->core.attr.type == ibs_fetch_type) {
  if (!is_valid_ibs_fetch_sample(sample)) {
   pr_debug("Invalid raw IBS Fetch MSR data encountered\n");
   return;
  }
  amd_dump_ibs_fetch(sample);
 } else if (evsel->core.attr.type == ibs_op_type) {
  if (!is_valid_ibs_op_sample(sample)) {
   pr_debug("Invalid raw IBS Op MSR data encountered\n");
   return;
  }
  amd_dump_ibs_op(sample);
 }
}

static void parse_cpuid(struct perf_env *env)
{
 const char *cpuid;
 int ret;

 cpuid = perf_env__cpuid(env);
 /*
 * cpuid = "AuthenticAMD,family,model,stepping"
 */
 ret = sscanf(cpuid, "%*[^,],%u,%u", &cpu_family, &cpu_model);
 if (ret != 2)
  pr_debug("problem parsing cpuid\n");
}

/*
 * Find and assign the type number used for ibs_op or ibs_fetch samples.
 * Device names can be large - we are only interested in the first 9 characters,
 * to match "ibs_fetch".
 */
bool evlist__has_amd_ibs(struct evlist *evlist)
{
 struct perf_env *env = perf_session__env(evlist->session);
 int ret, nr_pmu_mappings = perf_env__nr_pmu_mappings(env);
 const char *pmu_mapping = perf_env__pmu_mappings(env);
 char name[sizeof("ibs_fetch")];
 u32 type;

 while (nr_pmu_mappings--) {
  ret = sscanf(pmu_mapping, "%u:%9s", &type, name);
  if (ret == 2) {
   if (strstarts(name, "ibs_op"))
    ibs_op_type = type;
   else if (strstarts(name, "ibs_fetch"))
    ibs_fetch_type = type;
  }
  pmu_mapping += strlen(pmu_mapping) + 1 /* '\0' */;
 }

 if (perf_env__find_pmu_cap(env, "ibs_op", "zen4_ibs_extensions"))
  zen4_ibs_extensions = 1;

 if (perf_env__find_pmu_cap(env, "ibs_op", "ldlat"))
  ldlat_cap = 1;

 if (perf_env__find_pmu_cap(env, "ibs_op", "dtlb_pgsize"))
  dtlb_pgsize_cap = 1;

 if (ibs_fetch_type || ibs_op_type) {
  if (!cpu_family)
   parse_cpuid(env);
  return true;
 }

 return false;
}