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[PATCH] oprofile: VR5500 performance counter driver
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From: Mark A. <mar...@wi...> - 2009-02-23 20:34:15
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This is inspired by op_model_mipsxx.c with some modification
in regards to register layout and overflow handling. This has
been tested on a NEC VR5500 board and shown to produce sane
results.
Signed-off-by: Mark Asselstine <mar...@wi...>
diff --git a/arch/mips/oprofile/Makefile b/arch/mips/oprofile/Makefile
index cfd4b60..977a828 100644
--- a/arch/mips/oprofile/Makefile
+++ b/arch/mips/oprofile/Makefile
@@ -14,4 +14,5 @@ oprofile-$(CONFIG_CPU_MIPS32) += op_model_mipsxx.o
oprofile-$(CONFIG_CPU_MIPS64) += op_model_mipsxx.o
oprofile-$(CONFIG_CPU_R10000) += op_model_mipsxx.o
oprofile-$(CONFIG_CPU_SB1) += op_model_mipsxx.o
+oprofile-$(CONFIG_CPU_VR5500) += op_model_vr5500.o
oprofile-$(CONFIG_CPU_RM9000) += op_model_rm9000.o
diff --git a/arch/mips/oprofile/common.c b/arch/mips/oprofile/common.c
index e1bffab..68aad99 100644
--- a/arch/mips/oprofile/common.c
+++ b/arch/mips/oprofile/common.c
@@ -17,6 +17,7 @@
extern struct op_mips_model op_model_mipsxx_ops __attribute__((weak));
extern struct op_mips_model op_model_rm9000_ops __attribute__((weak));
+extern struct op_mips_model op_model_vr5500_ops __attribute__((weak));
static struct op_mips_model *model;
@@ -94,6 +95,10 @@ int __init oprofile_arch_init(struct oprofile_operations *ops)
case CPU_RM9000:
lmodel = &op_model_rm9000_ops;
break;
+
+ case CPU_R5500:
+ lmodel = &op_model_vr5500_ops;
+ break;
};
diff --git a/arch/mips/oprofile/op_model_vr5500.c b/arch/mips/oprofile/op_model_vr5500.c
new file mode 100644
index 0000000..75fae6a
--- /dev/null
+++ b/arch/mips/oprofile/op_model_vr5500.c
@@ -0,0 +1,179 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2009 Wind River Systems, Inc.
+ */
+#include <linux/cpumask.h>
+#include <linux/oprofile.h>
+#include <linux/interrupt.h>
+#include <linux/smp.h>
+#include <asm/irq_regs.h>
+
+#include "op_impl.h"
+
+#define M_PERFCTL_EXL (1UL << 0)
+#define M_PERFCTL_KERNEL (1UL << 1)
+#define M_PERFCTL_SUPERVISOR (1UL << 2)
+#define M_PERFCTL_USER (1UL << 3)
+#define M_PERFCTL_INTERRUPT_ENABLE (1UL << 4)
+#define M_PERFCTL_INTERRUPT (1UL << 5)
+#define M_PERFCTL_EVENT(event) (((event) & 0xf) << 6)
+#define M_PERFCTL_COUNT_ENABLE (1UL << 10)
+
+#define NUM_COUNTERS 2
+
+static int (*save_perf_irq) (void);
+
+#define __define_perf_accessors(r, n) \
+ \
+ static inline unsigned int r_c0_ ## r ## n(void) \
+ { \
+ return read_c0_ ## r ## n(); \
+ } \
+ \
+ static inline void w_c0_ ## r ## n(unsigned int value) \
+ { \
+ write_c0_ ## r ## n(value); \
+ } \
+
+__define_perf_accessors(perfcntr, 0)
+__define_perf_accessors(perfcntr, 1)
+
+__define_perf_accessors(perfctrl, 0)
+__define_perf_accessors(perfctrl, 1)
+
+struct op_mips_model op_model_vr5500_ops;
+
+static struct vr5500_register_config {
+ unsigned int control[NUM_COUNTERS];
+ unsigned int counter[NUM_COUNTERS];
+} reg;
+
+/* Compute all of the registers in preparation for enabling profiling. */
+static void vr5500_reg_setup(struct op_counter_config *ctr)
+{
+ int i;
+ unsigned int counters = NUM_COUNTERS;
+
+ /* Compute the performance counter control word. */
+ for (i = 0; i < counters; i++) {
+ reg.control[i] = 0;
+ reg.counter[i] = 0;
+
+ if (!ctr[i].enabled)
+ continue;
+
+ reg.control[i] = M_PERFCTL_EVENT(ctr[i].event) |
+ M_PERFCTL_INTERRUPT_ENABLE | M_PERFCTL_COUNT_ENABLE;
+ if (ctr[i].kernel)
+ reg.control[i] |= M_PERFCTL_KERNEL;
+ if (ctr[i].user)
+ reg.control[i] |= M_PERFCTL_USER;
+ if (ctr[i].exl)
+ reg.control[i] |= M_PERFCTL_EXL;
+
+ reg.counter[i] = 0xffffffff - ctr[i].count + 1;
+ }
+}
+
+/* Program all of the registers in preparation for enabling profiling. */
+static void vr5500_cpu_setup(void *args)
+{
+ w_c0_perfctrl1(0);
+ w_c0_perfcntr1(reg.counter[1]);
+
+ w_c0_perfctrl0(0);
+ w_c0_perfcntr0(reg.counter[0]);
+}
+
+/* Start all counters on current CPU */
+static void vr5500_cpu_start(void *args)
+{
+ w_c0_perfctrl1(reg.control[1]);
+ w_c0_perfctrl0(reg.control[0]);
+}
+
+/* Stop all counters on current CPU */
+static void vr5500_cpu_stop(void *args)
+{
+ w_c0_perfctrl1(0);
+ w_c0_perfctrl0(0);
+}
+
+static int vr5500_perfcount_handler(void)
+{
+ unsigned int control;
+ unsigned int counter;
+ int handled = IRQ_NONE;
+ unsigned int counters = NUM_COUNTERS;
+
+ if (cpu_has_mips_r2 && !(read_c0_cause() & (1 << 26)))
+ return handled;
+
+ switch (counters) {
+ #define HANDLE_COUNTER(n) \
+ case n + 1: \
+ control = r_c0_perfctrl ## n(); \
+ counter = r_c0_perfcntr ## n(); \
+ if ((control & M_PERFCTL_INTERRUPT_ENABLE) && \
+ (control & M_PERFCTL_INTERRUPT)) { \
+ oprofile_add_sample(get_irq_regs(), n); \
+ w_c0_perfcntr ## n(reg.counter[n]); \
+ w_c0_perfctrl ## n(control & ~M_PERFCTL_INTERRUPT); \
+ handled = IRQ_HANDLED; \
+ }
+ HANDLE_COUNTER(1)
+ HANDLE_COUNTER(0)
+ }
+
+ return handled;
+}
+
+static void reset_counters(void *arg)
+{
+ w_c0_perfctrl1(0);
+ w_c0_perfcntr1(0);
+
+ w_c0_perfctrl0(0);
+ w_c0_perfcntr0(0);
+}
+
+static int __init vr5500_init(void)
+{
+ on_each_cpu(reset_counters, NULL, 1);
+
+ switch (current_cpu_type()) {
+ case CPU_R5500:
+ op_model_vr5500_ops.cpu_type = "mips/vr5500";
+ break;
+
+ default:
+ printk(KERN_ERR "Profiling unsupported for this CPU\n");
+
+ return -ENODEV;
+ }
+
+ save_perf_irq = perf_irq;
+ perf_irq = vr5500_perfcount_handler;
+
+ return 0;
+}
+
+static void vr5500_exit(void)
+{
+ on_each_cpu(reset_counters, NULL, 1);
+
+ perf_irq = save_perf_irq;
+}
+
+struct op_mips_model op_model_vr5500_ops = {
+ .reg_setup = vr5500_reg_setup,
+ .cpu_setup = vr5500_cpu_setup,
+ .init = vr5500_init,
+ .exit = vr5500_exit,
+ .cpu_start = vr5500_cpu_start,
+ .cpu_stop = vr5500_cpu_stop,
+ .num_counters = NUM_COUNTERS,
+};
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