in perf/ppc970-pmu.c [257:404]
static int p970_compute_mmcr(u64 event[], int n_ev,
unsigned int hwc[], struct mmcr_regs *mmcr,
struct perf_event *pevents[],
u32 flags __maybe_unused)
{
unsigned long mmcr0 = 0, mmcr1 = 0, mmcra = 0;
unsigned int pmc, unit, byte, psel;
unsigned int ttm, grp;
unsigned int pmc_inuse = 0;
unsigned int pmc_grp_use[2];
unsigned char busbyte[4];
unsigned char unituse[16];
unsigned char unitmap[] = { 0, 0<<3, 3<<3, 1<<3, 2<<3, 0|4, 3|4 };
unsigned char ttmuse[2];
unsigned char pmcsel[8];
int i;
int spcsel;
if (n_ev > 8)
return -1;
/* First pass to count resource use */
pmc_grp_use[0] = pmc_grp_use[1] = 0;
memset(busbyte, 0, sizeof(busbyte));
memset(unituse, 0, sizeof(unituse));
for (i = 0; i < n_ev; ++i) {
pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
if (pmc) {
if (pmc_inuse & (1 << (pmc - 1)))
return -1;
pmc_inuse |= 1 << (pmc - 1);
/* count 1/2/5/6 vs 3/4/7/8 use */
++pmc_grp_use[((pmc - 1) >> 1) & 1];
}
unit = (event[i] >> PM_UNIT_SH) & PM_UNIT_MSK;
byte = (event[i] >> PM_BYTE_SH) & PM_BYTE_MSK;
if (unit) {
if (unit > PM_LASTUNIT)
return -1;
if (!pmc)
++pmc_grp_use[byte & 1];
if (busbyte[byte] && busbyte[byte] != unit)
return -1;
busbyte[byte] = unit;
unituse[unit] = 1;
}
}
if (pmc_grp_use[0] > 4 || pmc_grp_use[1] > 4)
return -1;
/*
* Assign resources and set multiplexer selects.
*
* PM_ISU can go either on TTM0 or TTM1, but that's the only
* choice we have to deal with.
*/
if (unituse[PM_ISU] &
(unituse[PM_FPU] | unituse[PM_IFU] | unituse[PM_VPU]))
unitmap[PM_ISU] = 2 | 4; /* move ISU to TTM1 */
/* Set TTM[01]SEL fields. */
ttmuse[0] = ttmuse[1] = 0;
for (i = PM_FPU; i <= PM_STS; ++i) {
if (!unituse[i])
continue;
ttm = unitmap[i];
++ttmuse[(ttm >> 2) & 1];
mmcr1 |= (unsigned long)(ttm & ~4) << MMCR1_TTM1SEL_SH;
}
/* Check only one unit per TTMx */
if (ttmuse[0] > 1 || ttmuse[1] > 1)
return -1;
/* Set byte lane select fields and TTM3SEL. */
for (byte = 0; byte < 4; ++byte) {
unit = busbyte[byte];
if (!unit)
continue;
if (unit <= PM_STS)
ttm = (unitmap[unit] >> 2) & 1;
else if (unit == PM_LSU0)
ttm = 2;
else {
ttm = 3;
if (unit == PM_LSU1L && byte >= 2)
mmcr1 |= 1ull << (MMCR1_TTM3SEL_SH + 3 - byte);
}
mmcr1 |= (unsigned long)ttm
<< (MMCR1_TD_CP_DBG0SEL_SH - 2 * byte);
}
/* Second pass: assign PMCs, set PMCxSEL and PMCx_ADDER_SEL fields */
memset(pmcsel, 0x8, sizeof(pmcsel)); /* 8 means don't count */
for (i = 0; i < n_ev; ++i) {
pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
unit = (event[i] >> PM_UNIT_SH) & PM_UNIT_MSK;
byte = (event[i] >> PM_BYTE_SH) & PM_BYTE_MSK;
psel = event[i] & PM_PMCSEL_MSK;
if (!pmc) {
/* Bus event or any-PMC direct event */
if (unit)
psel |= 0x10 | ((byte & 2) << 2);
else
psel |= 8;
for (pmc = 0; pmc < 8; ++pmc) {
if (pmc_inuse & (1 << pmc))
continue;
grp = (pmc >> 1) & 1;
if (unit) {
if (grp == (byte & 1))
break;
} else if (pmc_grp_use[grp] < 4) {
++pmc_grp_use[grp];
break;
}
}
pmc_inuse |= 1 << pmc;
} else {
/* Direct event */
--pmc;
if (psel == 0 && (byte & 2))
/* add events on higher-numbered bus */
mmcr1 |= 1ull << mmcr1_adder_bits[pmc];
}
pmcsel[pmc] = psel;
hwc[i] = pmc;
spcsel = (event[i] >> PM_SPCSEL_SH) & PM_SPCSEL_MSK;
mmcr1 |= spcsel;
if (p970_marked_instr_event(event[i]))
mmcra |= MMCRA_SAMPLE_ENABLE;
}
for (pmc = 0; pmc < 2; ++pmc)
mmcr0 |= pmcsel[pmc] << (MMCR0_PMC1SEL_SH - 7 * pmc);
for (; pmc < 8; ++pmc)
mmcr1 |= (unsigned long)pmcsel[pmc]
<< (MMCR1_PMC3SEL_SH - 5 * (pmc - 2));
if (pmc_inuse & 1)
mmcr0 |= MMCR0_PMC1CE;
if (pmc_inuse & 0xfe)
mmcr0 |= MMCR0_PMCjCE;
mmcra |= 0x2000; /* mark only one IOP per PPC instruction */
/* Return MMCRx values */
mmcr->mmcr0 = mmcr0;
mmcr->mmcr1 = mmcr1;
mmcr->mmcra = mmcra;
return 0;
}