// SPDX-License-Identifier: GPL-2.0-or-later /* * Common Performance counter support functions for PowerISA v2.07 processors. * * Copyright 2009 Paul Mackerras, IBM Corporation. * Copyright 2013 Michael Ellerman, IBM Corporation. * Copyright 2016 Madhavan Srinivasan, IBM Corporation.
*/ #include"isa207-common.h"
if (cpu_has_feature(CPU_FTR_ARCH_31))
valid_mask = p10_EVENT_VALID_MASK; elseif (cpu_has_feature(CPU_FTR_ARCH_300))
valid_mask = p9_EVENT_VALID_MASK;
return !(event & ~valid_mask);
}
staticinlinebool is_event_marked(u64 event)
{ if (event & EVENT_IS_MARKED) returntrue;
returnfalse;
}
staticunsignedlong sdar_mod_val(u64 event)
{ if (cpu_has_feature(CPU_FTR_ARCH_31)) return p10_SDAR_MODE(event);
return p9_SDAR_MODE(event);
}
staticvoid mmcra_sdar_mode(u64 event, unsignedlong *mmcra)
{ /* * MMCRA[SDAR_MODE] specifies how the SDAR should be updated in * continuous sampling mode. * * Incase of Power8: * MMCRA[SDAR_MODE] will be programmed as "0b01" for continuous sampling * mode and will be un-changed when setting MMCRA[63] (Marked events). * * Incase of Power9/power10: * Marked event: MMCRA[SDAR_MODE] will be set to 0b00 ('No Updates'), * or if group already have any marked events. * For rest * MMCRA[SDAR_MODE] will be set from event code. * If sdar_mode from event is zero, default to 0b01. Hardware * requires that we set a non-zero value.
*/ if (cpu_has_feature(CPU_FTR_ARCH_300)) { if (is_event_marked(event) || (*mmcra & MMCRA_SAMPLE_ENABLE))
*mmcra &= MMCRA_SDAR_MODE_NO_UPDATES; elseif (sdar_mod_val(event))
*mmcra |= sdar_mod_val(event) << MMCRA_SDAR_MODE_SHIFT; else
*mmcra |= MMCRA_SDAR_MODE_DCACHE;
} else
*mmcra |= MMCRA_SDAR_MODE_TLB;
}
staticint p10_thresh_cmp_val(u64 value)
{ int exp = 0;
u64 result = value;
if (!value) return value;
/* * Incase of P10, thresh_cmp value is not part of raw event code * and provided via attr.config1 parameter. To program threshold in MMCRA, * take a 18 bit number N and shift right 2 places and increment * the exponent E by 1 until the upper 10 bits of N are zero. * Write E to the threshold exponent and write the lower 8 bits of N * to the threshold mantissa. * The max threshold that can be written is 261120.
*/ if (cpu_has_feature(CPU_FTR_ARCH_31)) { if (value > 261120)
value = 261120; while ((64 - __builtin_clzl(value)) > 8) {
exp++;
value >>= 2;
}
/* * Note that it is invalid to write a mantissa with the * upper 2 bits of mantissa being zero, unless the * exponent is also zero.
*/ if (!(value & 0xC0) && exp)
result = -1; else
result = (exp << 8) | value;
} return result;
}
static u64 thresh_cmp_val(u64 value)
{ if (cpu_has_feature(CPU_FTR_ARCH_31))
value = p10_thresh_cmp_val(value);
/* * Since location of threshold compare bits in MMCRA * is different for p8, using different shift value.
*/ if (cpu_has_feature(CPU_FTR_ARCH_300)) return value << p9_MMCRA_THR_CMP_SHIFT; else return value << MMCRA_THR_CMP_SHIFT;
}
staticunsignedlong combine_from_event(u64 event)
{ if (cpu_has_feature(CPU_FTR_ARCH_300)) return p9_EVENT_COMBINE(event);
return EVENT_COMBINE(event);
}
staticunsignedlong combine_shift(unsignedlong pmc)
{ if (cpu_has_feature(CPU_FTR_ARCH_300)) return p9_MMCR1_COMBINE_SHIFT(pmc);
switch(idx) { case 0: /* Nothing to do */ break; case 1:
ret = PH(LVL, L1) | LEVEL(L1) | P(SNOOP, HIT); break; case 2:
ret = PH(LVL, L2) | LEVEL(L2) | P(SNOOP, HIT); break; case 3:
ret = PH(LVL, L3) | LEVEL(L3) | P(SNOOP, HIT); break; case 4: if (cpu_has_feature(CPU_FTR_ARCH_31)) {
ret = P(SNOOP, HIT);
if (sub_idx == 1)
ret |= PH(LVL, LOC_RAM) | LEVEL(RAM); elseif (sub_idx == 2 || sub_idx == 3)
ret |= P(LVL, HIT) | LEVEL(PMEM); elseif (sub_idx == 4)
ret |= PH(LVL, REM_RAM1) | REM | LEVEL(RAM) | P(HOPS, 2); elseif (sub_idx == 5 || sub_idx == 7)
ret |= P(LVL, HIT) | LEVEL(PMEM) | REM; elseif (sub_idx == 6)
ret |= PH(LVL, REM_RAM2) | REM | LEVEL(RAM) | P(HOPS, 3);
} else { if (sub_idx <= 1)
ret = PH(LVL, LOC_RAM); elseif (sub_idx > 1 && sub_idx <= 2)
ret = PH(LVL, REM_RAM1); else
ret = PH(LVL, REM_RAM2);
ret |= P(SNOOP, HIT);
} break; case 5: if (cpu_has_feature(CPU_FTR_ARCH_31)) {
ret = REM | P(HOPS, 0);
if (sub_idx == 0 || sub_idx == 4)
ret |= PH(LVL, L2) | LEVEL(L2) | P(SNOOP, HIT); elseif (sub_idx == 1 || sub_idx == 5)
ret |= PH(LVL, L2) | LEVEL(L2) | P(SNOOP, HITM); elseif (sub_idx == 2 || sub_idx == 6)
ret |= PH(LVL, L3) | LEVEL(L3) | P(SNOOP, HIT); elseif (sub_idx == 3 || sub_idx == 7)
ret |= PH(LVL, L3) | LEVEL(L3) | P(SNOOP, HITM);
} else { if (sub_idx == 0)
ret = PH(LVL, L2) | LEVEL(L2) | REM | P(SNOOP, HIT) | P(HOPS, 0); elseif (sub_idx == 1)
ret = PH(LVL, L2) | LEVEL(L2) | REM | P(SNOOP, HITM) | P(HOPS, 0); elseif (sub_idx == 2 || sub_idx == 4)
ret = PH(LVL, L3) | LEVEL(L3) | REM | P(SNOOP, HIT) | P(HOPS, 0); elseif (sub_idx == 3 || sub_idx == 5)
ret = PH(LVL, L3) | LEVEL(L3) | REM | P(SNOOP, HITM) | P(HOPS, 0);
} break; case 6: if (cpu_has_feature(CPU_FTR_ARCH_31)) { if (sub_idx == 0)
ret = PH(LVL, REM_CCE1) | LEVEL(ANY_CACHE) | REM |
P(SNOOP, HIT) | P(HOPS, 2); elseif (sub_idx == 1)
ret = PH(LVL, REM_CCE1) | LEVEL(ANY_CACHE) | REM |
P(SNOOP, HITM) | P(HOPS, 2); elseif (sub_idx == 2)
ret = PH(LVL, REM_CCE2) | LEVEL(ANY_CACHE) | REM |
P(SNOOP, HIT) | P(HOPS, 3); elseif (sub_idx == 3)
ret = PH(LVL, REM_CCE2) | LEVEL(ANY_CACHE) | REM |
P(SNOOP, HITM) | P(HOPS, 3);
} else {
ret = PH(LVL, REM_CCE2); if (sub_idx == 0 || sub_idx == 2)
ret |= P(SNOOP, HIT); elseif (sub_idx == 1 || sub_idx == 3)
ret |= P(SNOOP, HITM);
} break; case 7:
ret = PM(LVL, L1); break;
}
/* Skip if no SIER support */ if (!(flags & PPMU_HAS_SIER)) {
dsrc->val = 0; return;
}
/* * Use regs-dar for SPRN_SIER which is saved * during perf_read_regs at the beginning * of the PMU interrupt handler to avoid multiple * reads of SPRN_SIER
*/
sier = regs->dar;
val = (sier & ISA207_SIER_TYPE_MASK) >> ISA207_SIER_TYPE_SHIFT; if (val != 1 && val != 2 && !(val == 7 && cpu_has_feature(CPU_FTR_ARCH_31))) {
dsrc->val = 0; return;
}
/* * Type 0b111 denotes either larx or stcx instruction. Use the * MMCRA sampling bits [57:59] along with the type value * to determine the exact instruction type. If the sampling * criteria is neither load or store, set the type as default * to NA. * * Use regs->dsisr for MMCRA which is saved during perf_read_regs * at the beginning of the PMU interrupt handler to avoid * multiple reads of SPRN_MMCRA
*/
mmcra = regs->dsisr;
/* * Use 64 bit weight field (full) if sample type is * WEIGHT. * * if sample type is WEIGHT_STRUCT: * - store memory latency in the lower 32 bits. * - For ISA v3.1, use remaining two 16 bit fields of * perf_sample_weight to store cycle counter values * from sier2.
*/
weight_fields = (union perf_sample_weight *)weight; if (type & PERF_SAMPLE_WEIGHT)
weight_fields->full = weight_lat; else {
weight_fields->var1_dw = (u32)weight_lat; if (cpu_has_feature(CPU_FTR_ARCH_31)) {
weight_fields->var2_w = P10_SIER2_FINISH_CYC(mfspr(SPRN_SIER2));
weight_fields->var3_w = P10_SIER2_DISPATCH_CYC(mfspr(SPRN_SIER2));
}
}
}
int isa207_get_constraint(u64 event, unsignedlong *maskp, unsignedlong *valp, u64 event_config1)
{ unsignedint unit, pmc, cache, ebb; unsignedlong mask, value;
mask |= CNST_PMC_MASK(pmc);
value |= CNST_PMC_VAL(pmc);
/* * PMC5 and PMC6 are used to count cycles and instructions and * they do not support most of the constraint bits. Add a check * to exclude PMC5/6 from most of the constraints except for * EBB/BHRB.
*/ if (pmc >= 5) goto ebb_bhrb;
}
if (pmc <= 4) { /* * Add to number of counters in use. Note this includes events with * a PMC of 0 - they still need a PMC, it's just assigned later. * Don't count events on PMC 5 & 6, there is only one valid event * on each of those counters, and they are handled above.
*/
mask |= CNST_NC_MASK;
value |= CNST_NC_VAL;
}
if (unit >= 6 && unit <= 9) { if (cpu_has_feature(CPU_FTR_ARCH_31)) { if (unit == 6) {
mask |= CNST_L2L3_GROUP_MASK;
value |= CNST_L2L3_GROUP_VAL(event >> p10_L2L3_EVENT_SHIFT);
}
} elseif (cpu_has_feature(CPU_FTR_ARCH_300)) {
mask |= CNST_CACHE_GROUP_MASK;
value |= CNST_CACHE_GROUP_VAL(event & 0xff);
mask |= CNST_CACHE_PMC4_MASK; if (pmc == 4)
value |= CNST_CACHE_PMC4_VAL;
} elseif (cache & 0x7) { /* * L2/L3 events contain a cache selector field, which is * supposed to be programmed into MMCRC. However MMCRC is only * HV writable, and there is no API for guest kernels to modify * it. The solution is for the hypervisor to initialise the * field to zeroes, and for us to only ever allow events that * have a cache selector of zero. The bank selector (bit 3) is * irrelevant, as long as the rest of the value is 0.
*/ return -1;
}
if (cpu_has_feature(CPU_FTR_ARCH_31)) {
mask |= CNST_RADIX_SCOPE_GROUP_MASK;
value |= CNST_RADIX_SCOPE_GROUP_VAL(event >> p10_EVENT_RADIX_SCOPE_QUAL_SHIFT);
}
if (is_event_marked(event)) {
mask |= CNST_SAMPLE_MASK;
value |= CNST_SAMPLE_VAL(event >> EVENT_SAMPLE_SHIFT);
}
if (cpu_has_feature(CPU_FTR_ARCH_31)) { if (event_is_threshold(event) && is_thresh_cmp_valid(event_config1)) {
mask |= CNST_THRESH_CTL_SEL_MASK;
value |= CNST_THRESH_CTL_SEL_VAL(event >> EVENT_THRESH_SHIFT);
mask |= p10_CNST_THRESH_CMP_MASK;
value |= p10_CNST_THRESH_CMP_VAL(p10_thresh_cmp_val(event_config1));
} elseif (event_is_threshold(event)) return -1;
} elseif (cpu_has_feature(CPU_FTR_ARCH_300)) { if (event_is_threshold(event) && is_thresh_cmp_valid(event)) {
mask |= CNST_THRESH_MASK;
value |= CNST_THRESH_VAL(event >> EVENT_THRESH_SHIFT);
} elseif (event_is_threshold(event)) return -1;
} else { /* * Special case for PM_MRK_FAB_RSP_MATCH and PM_MRK_FAB_RSP_MATCH_CYC, * the threshold control bits are used for the match value.
*/ if (event_is_fab_match(event)) {
mask |= CNST_FAB_MATCH_MASK;
value |= CNST_FAB_MATCH_VAL(event >> EVENT_THR_CTL_SHIFT);
} else { if (!is_thresh_cmp_valid(event)) return -1;
mask |= CNST_THRESH_MASK;
value |= CNST_THRESH_VAL(event >> EVENT_THRESH_SHIFT);
}
}
ebb_bhrb: if (!pmc && ebb) /* EBB events must specify the PMC */ return -1;
if (event & EVENT_WANTS_BHRB) { if (!ebb) /* Only EBB events can request BHRB */ return -1;
mask |= CNST_IFM_MASK;
value |= CNST_IFM_VAL(event >> EVENT_IFM_SHIFT);
}
/* * All events must agree on EBB, either all request it or none. * EBB events are pinned & exclusive, so this should never actually * hit, but we leave it as a fallback in case.
*/
mask |= CNST_EBB_MASK;
value |= CNST_EBB_VAL(ebb);
*maskp = mask;
*valp = value;
return 0;
}
int isa207_compute_mmcr(u64 event[], int n_ev, unsignedint hwc[], struct mmcr_regs *mmcr, struct perf_event *pevents[], u32 flags)
{ unsignedlong mmcra, mmcr1, mmcr2, unit, combine, psel, cache, val; unsignedlong mmcr3; unsignedint pmc, pmc_inuse; int i;
pmc_inuse = 0;
/* First pass to count resource use */ for (i = 0; i < n_ev; ++i) {
pmc = (event[i] >> EVENT_PMC_SHIFT) & EVENT_PMC_MASK; if (pmc)
pmc_inuse |= 1 << pmc;
}
mmcra = mmcr1 = mmcr2 = mmcr3 = 0;
/* * Disable bhrb unless explicitly requested * by setting MMCRA (BHRBRD) bit.
*/ if (cpu_has_feature(CPU_FTR_ARCH_31))
mmcra |= MMCRA_BHRB_DISABLE;
/* Second pass: assign PMCs, set all MMCR1 fields */ for (i = 0; i < n_ev; ++i) {
pmc = (event[i] >> EVENT_PMC_SHIFT) & EVENT_PMC_MASK;
unit = (event[i] >> EVENT_UNIT_SHIFT) & EVENT_UNIT_MASK;
combine = combine_from_event(event[i]);
psel = event[i] & EVENT_PSEL_MASK;
if (!pmc) { for (pmc = 1; pmc <= 4; ++pmc) { if (!(pmc_inuse & (1 << pmc))) break;
}
/* Set RADIX_SCOPE_QUAL bit */ if (cpu_has_feature(CPU_FTR_ARCH_31)) {
val = (event[i] >> p10_EVENT_RADIX_SCOPE_QUAL_SHIFT) &
p10_EVENT_RADIX_SCOPE_QUAL_MASK;
mmcr1 |= val << p10_MMCR1_RADIX_SCOPE_QUAL_SHIFT;
}
if (is_event_marked(event[i])) {
mmcra |= MMCRA_SAMPLE_ENABLE;
/* * PM_MRK_FAB_RSP_MATCH and PM_MRK_FAB_RSP_MATCH_CYC, * the threshold bits are used for the match value.
*/ if (!cpu_has_feature(CPU_FTR_ARCH_300) && event_is_fab_match(event[i])) {
mmcr1 |= ((event[i] >> EVENT_THR_CTL_SHIFT) &
EVENT_THR_CTL_MASK) << MMCR1_FAB_SHIFT;
} else {
val = (event[i] >> EVENT_THR_CTL_SHIFT) & EVENT_THR_CTL_MASK;
mmcra |= val << MMCRA_THR_CTL_SHIFT;
val = (event[i] >> EVENT_THR_SEL_SHIFT) & EVENT_THR_SEL_MASK;
mmcra |= val << MMCRA_THR_SEL_SHIFT; if (!cpu_has_feature(CPU_FTR_ARCH_31)) {
val = (event[i] >> EVENT_THR_CMP_SHIFT) &
EVENT_THR_CMP_MASK;
mmcra |= thresh_cmp_val(val);
} elseif (flags & PPMU_HAS_ATTR_CONFIG1) {
val = (pevents[i]->attr.config1 >> p10_EVENT_THR_CMP_SHIFT) &
p10_EVENT_THR_CMP_MASK;
mmcra |= thresh_cmp_val(val);
}
}
if (cpu_has_feature(CPU_FTR_ARCH_31) && (unit == 6)) {
val = (event[i] >> p10_L2L3_EVENT_SHIFT) &
p10_EVENT_L2L3_SEL_MASK;
mmcr2 |= val << p10_L2L3_SEL_SHIFT;
}
if (event[i] & EVENT_WANTS_BHRB) {
val = (event[i] >> EVENT_IFM_SHIFT) & EVENT_IFM_MASK;
mmcra |= val << MMCRA_IFM_SHIFT;
}
/* set MMCRA (BHRBRD) to 0 if there is user request for BHRB */ if (cpu_has_feature(CPU_FTR_ARCH_31) &&
(has_branch_stack(pevents[i]) || (event[i] & EVENT_WANTS_BHRB)))
mmcra &= ~MMCRA_BHRB_DISABLE;
if (pevents[i]->attr.exclude_user)
mmcr2 |= MMCR2_FCP(pmc);
if (pevents[i]->attr.exclude_hv)
mmcr2 |= MMCR2_FCH(pmc);
if (pevents[i]->attr.exclude_kernel) { if (cpu_has_feature(CPU_FTR_HVMODE))
mmcr2 |= MMCR2_FCH(pmc); else
mmcr2 |= MMCR2_FCS(pmc);
}
if (pevents[i]->attr.exclude_idle)
mmcr2 |= MMCR2_FCWAIT(pmc);
if (cpu_has_feature(CPU_FTR_ARCH_31)) { if (pmc <= 4) {
val = (event[i] >> p10_EVENT_MMCR3_SHIFT) &
p10_EVENT_MMCR3_MASK;
mmcr3 |= val << MMCR3_SHIFT(pmc);
}
}
hwc[i] = pmc - 1;
}
/* Return MMCRx values */
mmcr->mmcr0 = 0;
/* pmc_inuse is 1-based */ if (pmc_inuse & 2)
mmcr->mmcr0 = MMCR0_PMC1CE;
if (pmc_inuse & 0x7c)
mmcr->mmcr0 |= MMCR0_PMCjCE;
/* If we're not using PMC 5 or 6, freeze them */ if (!(pmc_inuse & 0x60))
mmcr->mmcr0 |= MMCR0_FC56;
/* * Set mmcr0 (PMCCEXT) for p10 which * will restrict access to group B registers * when MMCR0 PMCC=0b00.
*/ if (cpu_has_feature(CPU_FTR_ARCH_31))
mmcr->mmcr0 |= MMCR0_PMCCEXT;
staticint find_alternative(u64 event, constunsignedint ev_alt[][MAX_ALT], int size)
{ int i, j;
for (i = 0; i < size; ++i) { if (event < ev_alt[i][0]) break;
for (j = 0; j < MAX_ALT && ev_alt[i][j]; ++j) if (event == ev_alt[i][j]) return i;
}
return -1;
}
int isa207_get_alternatives(u64 event, u64 alt[], int size, unsignedint flags, constunsignedint ev_alt[][MAX_ALT])
{ int i, j, num_alt = 0;
u64 alt_event;
alt[num_alt++] = event;
i = find_alternative(event, ev_alt, size); if (i >= 0) { /* Filter out the original event, it's already in alt[0] */ for (j = 0; j < MAX_ALT; ++j) {
alt_event = ev_alt[i][j]; if (alt_event && alt_event != event)
alt[num_alt++] = alt_event;
}
}
if (flags & PPMU_ONLY_COUNT_RUN) { /* * We're only counting in RUN state, so PM_CYC is equivalent to * PM_RUN_CYC and PM_INST_CMPL === PM_RUN_INST_CMPL.
*/
j = num_alt; for (i = 0; i < num_alt; ++i) { switch (alt[i]) { case 0x1e: /* PMC_CYC */
alt[j++] = 0x600f4; /* PM_RUN_CYC */ break; case 0x600f4:
alt[j++] = 0x1e; break; case 0x2: /* PM_INST_CMPL */
alt[j++] = 0x500fa; /* PM_RUN_INST_CMPL */ break; case 0x500fa:
alt[j++] = 0x2; break;
}
}
num_alt = j;
}
val = (event >> EVENT_SAMPLE_SHIFT) & EVENT_SAMPLE_MASK;
sample_mode = val & 0x3;
/* * MMCRA[61:62] is Random Sampling Mode (SM). * value of 0b11 is reserved.
*/ if (sample_mode == 0x3) return -EINVAL;
/* * Check for all reserved value * Source: Performance Monitoring Unit User Guide
*/ switch (val) { case 0x5: case 0x9: case 0xD: case 0x19: case 0x1D: case 0x1A: case 0x1E: return -EINVAL;
}
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