summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/include/asm/perf_counter.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/include/asm/perf_counter.h')
-rw-r--r--arch/powerpc/include/asm/perf_counter.h98
1 files changed, 98 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/perf_counter.h b/arch/powerpc/include/asm/perf_counter.h
new file mode 100644
index 000000000000..cc7c887705b8
--- /dev/null
+++ b/arch/powerpc/include/asm/perf_counter.h
@@ -0,0 +1,98 @@
+/*
+ * Performance counter support - PowerPC-specific definitions.
+ *
+ * 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/types.h>
+
+#define MAX_HWCOUNTERS 8
+#define MAX_EVENT_ALTERNATIVES 8
+#define MAX_LIMITED_HWCOUNTERS 2
+
+/*
+ * This struct provides the constants and functions needed to
+ * describe the PMU on a particular POWER-family CPU.
+ */
+struct power_pmu {
+ int n_counter;
+ int max_alternatives;
+ u64 add_fields;
+ u64 test_adder;
+ int (*compute_mmcr)(u64 events[], int n_ev,
+ unsigned int hwc[], u64 mmcr[]);
+ int (*get_constraint)(u64 event, u64 *mskp, u64 *valp);
+ int (*get_alternatives)(u64 event, unsigned int flags,
+ u64 alt[]);
+ void (*disable_pmc)(unsigned int pmc, u64 mmcr[]);
+ int (*limited_pmc_event)(u64 event);
+ u32 flags;
+ int n_generic;
+ int *generic_events;
+ int (*cache_events)[PERF_COUNT_HW_CACHE_MAX]
+ [PERF_COUNT_HW_CACHE_OP_MAX]
+ [PERF_COUNT_HW_CACHE_RESULT_MAX];
+};
+
+extern struct power_pmu *ppmu;
+
+/*
+ * Values for power_pmu.flags
+ */
+#define PPMU_LIMITED_PMC5_6 1 /* PMC5/6 have limited function */
+#define PPMU_ALT_SIPR 2 /* uses alternate posn for SIPR/HV */
+
+/*
+ * Values for flags to get_alternatives()
+ */
+#define PPMU_LIMITED_PMC_OK 1 /* can put this on a limited PMC */
+#define PPMU_LIMITED_PMC_REQD 2 /* have to put this on a limited PMC */
+#define PPMU_ONLY_COUNT_RUN 4 /* only counting in run state */
+
+struct pt_regs;
+extern unsigned long perf_misc_flags(struct pt_regs *regs);
+#define perf_misc_flags(regs) perf_misc_flags(regs)
+
+extern unsigned long perf_instruction_pointer(struct pt_regs *regs);
+
+/*
+ * The power_pmu.get_constraint function returns a 64-bit value and
+ * a 64-bit mask that express the constraints between this event and
+ * other events.
+ *
+ * The value and mask are divided up into (non-overlapping) bitfields
+ * of three different types:
+ *
+ * Select field: this expresses the constraint that some set of bits
+ * in MMCR* needs to be set to a specific value for this event. For a
+ * select field, the mask contains 1s in every bit of the field, and
+ * the value contains a unique value for each possible setting of the
+ * MMCR* bits. The constraint checking code will ensure that two events
+ * that set the same field in their masks have the same value in their
+ * value dwords.
+ *
+ * Add field: this expresses the constraint that there can be at most
+ * N events in a particular class. A field of k bits can be used for
+ * N <= 2^(k-1) - 1. The mask has the most significant bit of the field
+ * set (and the other bits 0), and the value has only the least significant
+ * bit of the field set. In addition, the 'add_fields' and 'test_adder'
+ * in the struct power_pmu for this processor come into play. The
+ * add_fields value contains 1 in the LSB of the field, and the
+ * test_adder contains 2^(k-1) - 1 - N in the field.
+ *
+ * NAND field: this expresses the constraint that you may not have events
+ * in all of a set of classes. (For example, on PPC970, you can't select
+ * events from the FPU, ISU and IDU simultaneously, although any two are
+ * possible.) For N classes, the field is N+1 bits wide, and each class
+ * is assigned one bit from the least-significant N bits. The mask has
+ * only the most-significant bit set, and the value has only the bit
+ * for the event's class set. The test_adder has the least significant
+ * bit set in the field.
+ *
+ * If an event is not subject to the constraint expressed by a particular
+ * field, then it will have 0 in both the mask and value for that field.
+ */
OpenPOWER on IntegriCloud