[PATCH v10 01/10] powerpc/powernv: Data structure and macros definitions for IMC

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[PATCH v10 01/10] powerpc/powernv: Data structure and macros definitions for IMC

Madhavan Srinivasan
Create a new header file to add the data structures and
macros needed for In-Memory Collection (IMC) counter support.

Signed-off-by: Anju T Sudhakar <[hidden email]>
Signed-off-by: Hemant Kumar <[hidden email]>
Signed-off-by: Madhavan Srinivasan <[hidden email]>
---
 arch/powerpc/include/asm/imc-pmu.h | 99 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 arch/powerpc/include/asm/imc-pmu.h

diff --git a/arch/powerpc/include/asm/imc-pmu.h b/arch/powerpc/include/asm/imc-pmu.h
new file mode 100644
index 000000000000..ffaea0b9c13e
--- /dev/null
+++ b/arch/powerpc/include/asm/imc-pmu.h
@@ -0,0 +1,99 @@
+#ifndef PPC_POWERNV_IMC_PMU_DEF_H
+#define PPC_POWERNV_IMC_PMU_DEF_H
+
+/*
+ * IMC Nest Performance Monitor counter support.
+ *
+ * Copyright (C) 2017 Madhavan Srinivasan, IBM Corporation.
+ *           (C) 2017 Anju T Sudhakar, IBM Corporation.
+ *           (C) 2017 Hemant K Shaw, 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 later version.
+ */
+
+#include <linux/perf_event.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/io.h>
+#include <asm/opal.h>
+
+/*
+ * For static allocation of some of the structures.
+ */
+#define IMC_MAX_PMUS 32
+
+/*
+ * This macro is used for memory buffer allocation of
+ * event names and event string
+ */
+#define IMC_MAX_NAME_VAL_LEN 96
+
+/*
+ * Currently Microcode supports a max of 256KB of counter memory
+ * in the reserved memory region. Max pages to mmap (considering 4K PAGESIZE).
+ */
+#define IMC_MAX_PAGES 64
+
+/*
+ *Compatbility macros for IMC devices
+ */
+#define IMC_DTB_COMPAT "ibm,opal-in-memory-counters"
+#define IMC_DTB_UNIT_COMPAT "ibm,imc-counters"
+
+/*
+ * Structure to hold memory address information for imc units.
+ */
+struct imc_mem_info {
+ u32 id;
+ u64 *vbase[IMC_MAX_PAGES];
+};
+
+/*
+ * Place holder for nest pmu events and values.
+ */
+struct imc_events {
+ char *ev_name;
+ char *ev_value;
+};
+
+#define IMC_FORMAT_ATTR 0
+#define IMC_CPUMASK_ATTR 1
+#define IMC_EVENT_ATTR 2
+#define IMC_NULL_ATTR 3
+
+/*
+ * Device tree parser code detects IMC pmu support and
+ * registers new IMC pmus. This structure will hold the
+ * pmu functions, events, counter memory information
+ * and attrs for each imc pmu and will be referenced at
+ * the time of pmu registration.
+ */
+struct imc_pmu {
+ struct pmu pmu;
+ int domain;
+ /*
+ * flag to notify whether the memory is mmaped
+ * or allocated by kernel.
+ */
+ int imc_counter_mmaped;
+ struct imc_mem_info *mem_info;
+ struct imc_events *events;
+ u32 counter_mem_size;
+ /*
+ * Attribute groups for the PMU. Slot 0 used for
+ * format attribute, slot 1 used for cpusmask attribute,
+ * slot 2 used for event attribute. Slot 3 keep as
+ * NULL.
+ */
+ const struct attribute_group *attr_groups[4];
+};
+
+/*
+ * Domains for IMC PMUs
+ */
+#define IMC_DOMAIN_NEST 1
+
+#endif /* PPC_POWERNV_IMC_PMU_DEF_H */
--
2.7.4

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