summaryrefslogtreecommitdiff
path: root/arch
diff options
context:
space:
mode:
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/kernel/Makefile2
-rw-r--r--arch/powerpc/kernel/perf_counter.c13
-rw-r--r--arch/powerpc/kernel/ppc970-pmu.c375
3 files changed, 389 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index fde190b..45798f6 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -94,7 +94,7 @@ obj-$(CONFIG_AUDIT) += audit.o
obj64-$(CONFIG_AUDIT) += compat_audit.o
obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o
-obj-$(CONFIG_PERF_COUNTERS) += perf_counter.o
+obj-$(CONFIG_PERF_COUNTERS) += perf_counter.o ppc970-pmu.o
obj-$(CONFIG_8XX_MINIMAL_FPEMU) += softemu8xx.o
diff --git a/arch/powerpc/kernel/perf_counter.c b/arch/powerpc/kernel/perf_counter.c
index c7d4c29..5561ecb 100644
--- a/arch/powerpc/kernel/perf_counter.c
+++ b/arch/powerpc/kernel/perf_counter.c
@@ -741,13 +741,26 @@ static void perf_counter_interrupt(struct pt_regs *regs)
}
}
+extern struct power_pmu ppc970_pmu;
+
static int init_perf_counters(void)
{
+ unsigned long pvr;
+
if (reserve_pmc_hardware(perf_counter_interrupt)) {
printk(KERN_ERR "Couldn't init performance monitor subsystem\n");
return -EBUSY;
}
+ /* XXX should get this from cputable */
+ pvr = mfspr(SPRN_PVR);
+ switch (PVR_VER(pvr)) {
+ case PV_970:
+ case PV_970FX:
+ case PV_970MP:
+ ppmu = &ppc970_pmu;
+ break;
+ }
return 0;
}
diff --git a/arch/powerpc/kernel/ppc970-pmu.c b/arch/powerpc/kernel/ppc970-pmu.c
new file mode 100644
index 0000000..c325658
--- /dev/null
+++ b/arch/powerpc/kernel/ppc970-pmu.c
@@ -0,0 +1,375 @@
+/*
+ * Performance counter support for PPC970-family processors.
+ *
+ * Copyright 2008-2009 Paul Mackerras, 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 <linux/string.h>
+#include <linux/perf_counter.h>
+#include <asm/reg.h>
+
+/*
+ * Bits in event code for PPC970
+ */
+#define PM_PMC_SH 12 /* PMC number (1-based) for direct events */
+#define PM_PMC_MSK 0xf
+#define PM_UNIT_SH 8 /* TTMMUX number and setting - unit select */
+#define PM_UNIT_MSK 0xf
+#define PM_BYTE_SH 4 /* Byte number of event bus to use */
+#define PM_BYTE_MSK 3
+#define PM_PMCSEL_MSK 0xf
+
+/* Values in PM_UNIT field */
+#define PM_NONE 0
+#define PM_FPU 1
+#define PM_VPU 2
+#define PM_ISU 3
+#define PM_IFU 4
+#define PM_IDU 5
+#define PM_STS 6
+#define PM_LSU0 7
+#define PM_LSU1U 8
+#define PM_LSU1L 9
+#define PM_LASTUNIT 9
+
+/*
+ * Bits in MMCR0 for PPC970
+ */
+#define MMCR0_PMC1SEL_SH 8
+#define MMCR0_PMC2SEL_SH 1
+#define MMCR_PMCSEL_MSK 0x1f
+
+/*
+ * Bits in MMCR1 for PPC970
+ */
+#define MMCR1_TTM0SEL_SH 62
+#define MMCR1_TTM1SEL_SH 59
+#define MMCR1_TTM3SEL_SH 53
+#define MMCR1_TTMSEL_MSK 3
+#define MMCR1_TD_CP_DBG0SEL_SH 50
+#define MMCR1_TD_CP_DBG1SEL_SH 48
+#define MMCR1_TD_CP_DBG2SEL_SH 46
+#define MMCR1_TD_CP_DBG3SEL_SH 44
+#define MMCR1_PMC1_ADDER_SEL_SH 39
+#define MMCR1_PMC2_ADDER_SEL_SH 38
+#define MMCR1_PMC6_ADDER_SEL_SH 37
+#define MMCR1_PMC5_ADDER_SEL_SH 36
+#define MMCR1_PMC8_ADDER_SEL_SH 35
+#define MMCR1_PMC7_ADDER_SEL_SH 34
+#define MMCR1_PMC3_ADDER_SEL_SH 33
+#define MMCR1_PMC4_ADDER_SEL_SH 32
+#define MMCR1_PMC3SEL_SH 27
+#define MMCR1_PMC4SEL_SH 22
+#define MMCR1_PMC5SEL_SH 17
+#define MMCR1_PMC6SEL_SH 12
+#define MMCR1_PMC7SEL_SH 7
+#define MMCR1_PMC8SEL_SH 2
+
+static short mmcr1_adder_bits[8] = {
+ MMCR1_PMC1_ADDER_SEL_SH,
+ MMCR1_PMC2_ADDER_SEL_SH,
+ MMCR1_PMC3_ADDER_SEL_SH,
+ MMCR1_PMC4_ADDER_SEL_SH,
+ MMCR1_PMC5_ADDER_SEL_SH,
+ MMCR1_PMC6_ADDER_SEL_SH,
+ MMCR1_PMC7_ADDER_SEL_SH,
+ MMCR1_PMC8_ADDER_SEL_SH
+};
+
+/*
+ * Bits in MMCRA
+ */
+
+/*
+ * Layout of constraint bits:
+ * 6666555555555544444444443333333333222222222211111111110000000000
+ * 3210987654321098765432109876543210987654321098765432109876543210
+ * <><>[ >[ >[ >< >< >< >< ><><><><><><><><>
+ * T0T1 UC PS1 PS2 B0 B1 B2 B3 P1P2P3P4P5P6P7P8
+ *
+ * T0 - TTM0 constraint
+ * 46-47: TTM0SEL value (0=FPU, 2=IFU, 3=VPU) 0xC000_0000_0000
+ *
+ * T1 - TTM1 constraint
+ * 44-45: TTM1SEL value (0=IDU, 3=STS) 0x3000_0000_0000
+ *
+ * UC - unit constraint: can't have all three of FPU|IFU|VPU, ISU, IDU|STS
+ * 43: UC3 error 0x0800_0000_0000
+ * 42: FPU|IFU|VPU events needed 0x0400_0000_0000
+ * 41: ISU events needed 0x0200_0000_0000
+ * 40: IDU|STS events needed 0x0100_0000_0000
+ *
+ * PS1
+ * 39: PS1 error 0x0080_0000_0000
+ * 36-38: count of events needing PMC1/2/5/6 0x0070_0000_0000
+ *
+ * PS2
+ * 35: PS2 error 0x0008_0000_0000
+ * 32-34: count of events needing PMC3/4/7/8 0x0007_0000_0000
+ *
+ * B0
+ * 28-31: Byte 0 event source 0xf000_0000
+ * Encoding as for the event code
+ *
+ * B1, B2, B3
+ * 24-27, 20-23, 16-19: Byte 1, 2, 3 event sources
+ *
+ * P1
+ * 15: P1 error 0x8000
+ * 14-15: Count of events needing PMC1
+ *
+ * P2..P8
+ * 0-13: Count of events needing PMC2..PMC8
+ */
+
+/* Masks and values for using events from the various units */
+static u64 unit_cons[PM_LASTUNIT+1][2] = {
+ [PM_FPU] = { 0xc80000000000ull, 0x040000000000ull },
+ [PM_VPU] = { 0xc80000000000ull, 0xc40000000000ull },
+ [PM_ISU] = { 0x080000000000ull, 0x020000000000ull },
+ [PM_IFU] = { 0xc80000000000ull, 0x840000000000ull },
+ [PM_IDU] = { 0x380000000000ull, 0x010000000000ull },
+ [PM_STS] = { 0x380000000000ull, 0x310000000000ull },
+};
+
+static int p970_get_constraint(unsigned int event, u64 *maskp, u64 *valp)
+{
+ int pmc, byte, unit, sh;
+ u64 mask = 0, value = 0;
+ int grp = -1;
+
+ pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
+ if (pmc) {
+ if (pmc > 8)
+ return -1;
+ sh = (pmc - 1) * 2;
+ mask |= 2 << sh;
+ value |= 1 << sh;
+ grp = ((pmc - 1) >> 1) & 1;
+ }
+ unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
+ if (unit) {
+ if (unit > PM_LASTUNIT)
+ return -1;
+ mask |= unit_cons[unit][0];
+ value |= unit_cons[unit][1];
+ byte = (event >> PM_BYTE_SH) & PM_BYTE_MSK;
+ /*
+ * Bus events on bytes 0 and 2 can be counted
+ * on PMC1/2/5/6; bytes 1 and 3 on PMC3/4/7/8.
+ */
+ if (!pmc)
+ grp = byte & 1;
+ /* Set byte lane select field */
+ mask |= 0xfULL << (28 - 4 * byte);
+ value |= (u64)unit << (28 - 4 * byte);
+ }
+ if (grp == 0) {
+ /* increment PMC1/2/5/6 field */
+ mask |= 0x8000000000ull;
+ value |= 0x1000000000ull;
+ } else if (grp == 1) {
+ /* increment PMC3/4/7/8 field */
+ mask |= 0x800000000ull;
+ value |= 0x100000000ull;
+ }
+ *maskp = mask;
+ *valp = value;
+ return 0;
+}
+
+static int p970_get_alternatives(unsigned int event, unsigned int alt[])
+{
+ alt[0] = event;
+
+ /* 2 alternatives for LSU empty */
+ if (event == 0x2002 || event == 0x3002) {
+ alt[1] = event ^ 0x1000;
+ return 2;
+ }
+
+ return 1;
+}
+
+static int p970_compute_mmcr(unsigned int event[], int n_ev,
+ unsigned int hwc[], u64 mmcr[])
+{
+ u64 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;
+
+ 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 |= (u64)(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 |= (u64)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;
+ }
+ for (pmc = 0; pmc < 2; ++pmc)
+ mmcr0 |= pmcsel[pmc] << (MMCR0_PMC1SEL_SH - 7 * pmc);
+ for (; pmc < 8; ++pmc)
+ mmcr1 |= (u64)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[0] = mmcr0;
+ mmcr[1] = mmcr1;
+ mmcr[2] = mmcra;
+ return 0;
+}
+
+static void p970_disable_pmc(unsigned int pmc, u64 mmcr[])
+{
+ int shift, i;
+
+ if (pmc <= 1) {
+ shift = MMCR0_PMC1SEL_SH - 7 * pmc;
+ i = 0;
+ } else {
+ shift = MMCR1_PMC3SEL_SH - 5 * (pmc - 2);
+ i = 1;
+ }
+ /*
+ * Setting the PMCxSEL field to 0x08 disables PMC x.
+ */
+ mmcr[i] = (mmcr[i] & ~(0x1fUL << shift)) | (0x08UL << shift);
+}
+
+static int ppc970_generic_events[] = {
+ [PERF_COUNT_CPU_CYCLES] = 7,
+ [PERF_COUNT_INSTRUCTIONS] = 1,
+ [PERF_COUNT_CACHE_REFERENCES] = 0x8810, /* PM_LD_REF_L1 */
+ [PERF_COUNT_CACHE_MISSES] = 0x3810, /* PM_LD_MISS_L1 */
+ [PERF_COUNT_BRANCH_INSTRUCTIONS] = 0x431, /* PM_BR_ISSUED */
+ [PERF_COUNT_BRANCH_MISSES] = 0x327, /* PM_GRP_BR_MPRED */
+};
+
+struct power_pmu ppc970_pmu = {
+ .n_counter = 8,
+ .max_alternatives = 2,
+ .add_fields = 0x001100005555ull,
+ .test_adder = 0x013300000000ull,
+ .compute_mmcr = p970_compute_mmcr,
+ .get_constraint = p970_get_constraint,
+ .get_alternatives = p970_get_alternatives,
+ .disable_pmc = p970_disable_pmc,
+ .n_generic = ARRAY_SIZE(ppc970_generic_events),
+ .generic_events = ppc970_generic_events,
+};
generated by cgit v0.10.2 at 2024-11-15 03:30:02 (GMT)