powerpc/perf: factor out power8 pmu functions

Factor out some of the power8 pmu functions
to new file "isa207-common.c" to share with
power9 pmu code. Only code movement and no
logic change

Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/perf/isa207-common.c

@@ -0,0 +1,263 @@
+/*
+ * 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.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include "isa207-common.h"
+
+static inline bool event_is_fab_match(u64 event)
+{
+	/* Only check pmc, unit and pmcxsel, ignore the edge bit (0) */
+	event &= 0xff0fe;
+
+	/* PM_MRK_FAB_RSP_MATCH & PM_MRK_FAB_RSP_MATCH_CYC */
+	return (event == 0x30056 || event == 0x4f052);
+}
+
+int isa207_get_constraint(u64 event, unsigned long *maskp, unsigned long *valp)
+{
+	unsigned int unit, pmc, cache, ebb;
+	unsigned long mask, value;
+
+	mask = value = 0;
+
+	if (event & ~EVENT_VALID_MASK)
+		return -1;
+
+	pmc   = (event >> EVENT_PMC_SHIFT)        & EVENT_PMC_MASK;
+	unit  = (event >> EVENT_UNIT_SHIFT)       & EVENT_UNIT_MASK;
+	cache = (event >> EVENT_CACHE_SEL_SHIFT)  & EVENT_CACHE_SEL_MASK;
+	ebb   = (event >> EVENT_EBB_SHIFT)        & EVENT_EBB_MASK;
+
+	if (pmc) {
+		u64 base_event;
+
+		if (pmc > 6)
+			return -1;
+
+		/* Ignore Linux defined bits when checking event below */
+		base_event = event & ~EVENT_LINUX_MASK;
+
+		if (pmc >= 5 && base_event != 0x500fa &&
+				base_event != 0x600f4)
+			return -1;
+
+		mask  |= CNST_PMC_MASK(pmc);
+		value |= CNST_PMC_VAL(pmc);
+	}
+
+	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) {
+		/*
+		 * 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.
+		 */
+		if (cache & 0x7)
+			return -1;
+
+	} else if (event & EVENT_IS_L1) {
+		mask  |= CNST_L1_QUAL_MASK;
+		value |= CNST_L1_QUAL_VAL(cache);
+	}
+
+	if (event & EVENT_IS_MARKED) {
+		mask  |= CNST_SAMPLE_MASK;
+		value |= CNST_SAMPLE_VAL(event >> EVENT_SAMPLE_SHIFT);
+	}
+
+	/*
+	 * 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 {
+		/*
+		 * Check the mantissa upper two bits are not zero, unless the
+		 * exponent is also zero. See the THRESH_CMP_MANTISSA doc.
+		 */
+		unsigned int cmp, exp;
+
+		cmp = (event >> EVENT_THR_CMP_SHIFT) & EVENT_THR_CMP_MASK;
+		exp = cmp >> 7;
+
+		if (exp && (cmp & 0x60) == 0)
+			return -1;
+
+		mask  |= CNST_THRESH_MASK;
+		value |= CNST_THRESH_VAL(event >> EVENT_THRESH_SHIFT);
+	}
+
+	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_VAL(ebb);
+	value |= CNST_EBB_MASK;
+
+	*maskp = mask;
+	*valp = value;
+
+	return 0;
+}
+
+int isa207_compute_mmcr(u64 event[], int n_ev,
+			       unsigned int hwc[], unsigned long mmcr[],
+			       struct perf_event *pevents[])
+{
+	unsigned long mmcra, mmcr1, mmcr2, unit, combine, psel, cache, val;
+	unsigned int 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;
+	}
+
+	/* In continuous sampling mode, update SDAR on TLB miss */
+	mmcra = MMCRA_SDAR_MODE_TLB;
+	mmcr1 = mmcr2 = 0;
+
+	/* 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 = (event[i] >> EVENT_COMBINE_SHIFT) & EVENT_COMBINE_MASK;
+		psel    =  event[i] & EVENT_PSEL_MASK;
+
+		if (!pmc) {
+			for (pmc = 1; pmc <= 4; ++pmc) {
+				if (!(pmc_inuse & (1 << pmc)))
+					break;
+			}
+
+			pmc_inuse |= 1 << pmc;
+		}
+
+		if (pmc <= 4) {
+			mmcr1 |= unit << MMCR1_UNIT_SHIFT(pmc);
+			mmcr1 |= combine << MMCR1_COMBINE_SHIFT(pmc);
+			mmcr1 |= psel << MMCR1_PMCSEL_SHIFT(pmc);
+		}
+
+		if (event[i] & EVENT_IS_L1) {
+			cache = event[i] >> EVENT_CACHE_SEL_SHIFT;
+			mmcr1 |= (cache & 1) << MMCR1_IC_QUAL_SHIFT;
+			cache >>= 1;
+			mmcr1 |= (cache & 1) << MMCR1_DC_QUAL_SHIFT;
+		}
+
+		if (event[i] & EVENT_IS_MARKED) {
+			mmcra |= MMCRA_SAMPLE_ENABLE;
+
+			val = (event[i] >> EVENT_SAMPLE_SHIFT) & EVENT_SAMPLE_MASK;
+			if (val) {
+				mmcra |= (val &  3) << MMCRA_SAMP_MODE_SHIFT;
+				mmcra |= (val >> 2) << MMCRA_SAMP_ELIG_SHIFT;
+			}
+		}
+
+		/*
+		 * PM_MRK_FAB_RSP_MATCH and PM_MRK_FAB_RSP_MATCH_CYC,
+		 * the threshold bits are used for the match value.
+		 */
+		if (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;
+			val = (event[i] >> EVENT_THR_CMP_SHIFT) & EVENT_THR_CMP_MASK;
+			mmcra |= val << MMCRA_THR_CMP_SHIFT;
+		}
+
+		if (event[i] & EVENT_WANTS_BHRB) {
+			val = (event[i] >> EVENT_IFM_SHIFT) & EVENT_IFM_MASK;
+			mmcra |= val << MMCRA_IFM_SHIFT;
+		}
+
+		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);
+		}
+
+		hwc[i] = pmc - 1;
+	}
+
+	/* Return MMCRx values */
+	mmcr[0] = 0;
+
+	/* pmc_inuse is 1-based */
+	if (pmc_inuse & 2)
+		mmcr[0] = MMCR0_PMC1CE;
+
+	if (pmc_inuse & 0x7c)
+		mmcr[0] |= MMCR0_PMCjCE;
+
+	/* If we're not using PMC 5 or 6, freeze them */
+	if (!(pmc_inuse & 0x60))
+		mmcr[0] |= MMCR0_FC56;
+
+	mmcr[1] = mmcr1;
+	mmcr[2] = mmcra;
+	mmcr[3] = mmcr2;
+
+	return 0;
+}
+
+void isa207_disable_pmc(unsigned int pmc, unsigned long mmcr[])
+{
+	if (pmc <= 3)
+		mmcr[1] &= ~(0xffUL << MMCR1_PMCSEL_SHIFT(pmc + 1));
+}