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[PATCH V2] oprofile: VR5500 performance counter driver
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From: Mark A. <mar...@wi...> - 2009-02-26 20:49:54
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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...>
---
I have left this as a new file as there is enough differences
to make combining it combersome. If pushed I would possibly
change my mind but I am not convinced yet. The userspace
events are seen as mips/vr5500 so if there is a desire to
have everything be r5500 some userspace changes would need
to be made.
arch/mips/oprofile/Makefile | 1 +
arch/mips/oprofile/common.c | 5 +
arch/mips/oprofile/op_model_r5500.c | 161 +++++++++++++++++++++++++++++++++++
3 files changed, 167 insertions(+), 0 deletions(-)
create mode 100644 arch/mips/oprofile/op_model_r5500.c
diff --git a/arch/mips/oprofile/Makefile b/arch/mips/oprofile/Makefile
index bf3be6f..586e64e 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-$(CONFIG_CPU_R5500) += op_model_r5500.o
oprofile-$(CONFIG_CPU_RM9000) += op_model_rm9000.o
diff --git a/arch/mips/oprofile/common.c b/arch/mips/oprofile/common.c
index 3bf3354..26780c7 100644
--- a/arch/mips/oprofile/common.c
+++ b/arch/mips/oprofile/common.c
@@ -16,6 +16,7 @@
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_r5500_ops __attribute__((weak));
static struct op_mips_model *model;
@@ -93,6 +94,10 @@ int __init oprofile_arch_init(struct oprofile_operations *ops)
case CPU_RM9000:
lmodel = &op_model_rm9000_ops;
break;
+
+ case CPU_R5500:
+ lmodel = &op_model_r5500_ops;
+ break;
};
if (!lmodel)
diff --git a/arch/mips/oprofile/op_model_r5500.c b/arch/mips/oprofile/op_model_r5500.c
new file mode 100644
index 0000000..9b0d20f
--- /dev/null
+++ b/arch/mips/oprofile/op_model_r5500.c
@@ -0,0 +1,161 @@
+/*
+ * 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.
+ *
+ * Derived from op_model_mipsxx.c Copyright Ralf Baechle, MIPS Technologies Inc
+ */
+#include <linux/oprofile.h>
+#include <linux/interrupt.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);
+
+struct op_mips_model op_model_r5500_ops;
+
+static struct r5500_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 r5500_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 r5500_cpu_setup(void *args)
+{
+ write_c0_perfctrl1(0);
+ write_c0_perfcntr1(reg.counter[1]);
+
+ write_c0_perfctrl0(0);
+ write_c0_perfcntr0(reg.counter[0]);
+}
+
+/* Start all counters on current CPU */
+static void r5500_cpu_start(void *args)
+{
+ write_c0_perfctrl1(reg.control[1]);
+ write_c0_perfctrl0(reg.control[0]);
+}
+
+/* Stop all counters on current CPU */
+static void r5500_cpu_stop(void *args)
+{
+ write_c0_perfctrl1(0);
+ write_c0_perfctrl0(0);
+}
+
+static int r5500_perfcount_handler(void)
+{
+ unsigned int control;
+ unsigned int counter;
+ int handled = IRQ_NONE;
+
+ control = read_c0_perfctrl0();
+ counter = read_c0_perfcntr0();
+ if ((control & M_PERFCTL_INTERRUPT_ENABLE) &&
+ (control & M_PERFCTL_INTERRUPT)) {
+ oprofile_add_sample(get_irq_regs(), 0);
+ write_c0_perfcntr0(reg.counter[0]);
+ write_c0_perfctrl0(control & ~M_PERFCTL_INTERRUPT);
+ handled = IRQ_HANDLED;
+ }
+
+ control = read_c0_perfctrl1();
+ counter = read_c0_perfcntr1();
+ if ((control & M_PERFCTL_INTERRUPT_ENABLE) &&
+ (control & M_PERFCTL_INTERRUPT)) {
+ oprofile_add_sample(get_irq_regs(), 1);
+ write_c0_perfcntr1(reg.counter[1]);
+ write_c0_perfctrl1(control & ~M_PERFCTL_INTERRUPT);
+ handled = IRQ_HANDLED;
+ }
+
+ return handled;
+}
+
+static void reset_counters(void *arg)
+{
+ write_c0_perfctrl1(0);
+ write_c0_perfcntr1(0);
+
+ write_c0_perfctrl0(0);
+ write_c0_perfcntr0(0);
+}
+
+static int __init r5500_init(void)
+{
+ on_each_cpu(reset_counters, NULL, 1);
+
+ switch (current_cpu_type()) {
+ case CPU_R5500:
+ op_model_r5500_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 = r5500_perfcount_handler;
+
+ return 0;
+}
+
+static void r5500_exit(void)
+{
+ on_each_cpu(reset_counters, NULL, 1);
+
+ perf_irq = save_perf_irq;
+}
+
+struct op_mips_model op_model_r5500_ops = {
+ .reg_setup = r5500_reg_setup,
+ .cpu_setup = r5500_cpu_setup,
+ .init = r5500_init,
+ .exit = r5500_exit,
+ .cpu_start = r5500_cpu_start,
+ .cpu_stop = r5500_cpu_stop,
+ .num_counters = NUM_COUNTERS,
+};
--
1.6.0.3
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