Hello,
This patch adds support for profiling Loongson 2E. It's been tested on
FuLong mini PC(loongson2e inside).
=======================================================================
diff -urN b/arch/mips/lemote/lm2e/irq.c a/arch/mips/lemote/lm2e/irq.c
--- b/arch/mips/lemote/lm2e/irq.c 2007-07-24 12:57:38.000000000 +0800
+++ a/arch/mips/lemote/lm2e/irq.c 2007-07-19 08:20:50.000000000 +0800
@@ -82,6 +82,8 @@
if (pending & CAUSEF_IP7) {
do_IRQ(MIPS_CPU_IRQ_BASE + 7);
+ } else if (pending & CAUSEF_IP6) { /* performance counter
overflowe at IP6 */
+ do_IRQ(MIPS_CPU_IRQ_BASE + 6);
} else if (pending & CAUSEF_IP5) {
i8259_irqdispatch();
} else if (pending & CAUSEF_IP2) {
diff -urN b/arch/mips/oprofile/Makefile a/arch/mips/oprofile/Makefile
--- b/arch/mips/oprofile/Makefile 2007-07-24 12:58:48.000000000 +0800
+++ a/arch/mips/oprofile/Makefile 2007-07-19 08:20:53.000000000 +0800
@@ -15,4 +15,5 @@
oprofile-$(CONFIG_CPU_R10000) += op_model_mipsxx.o
oprofile-$(CONFIG_CPU_SB1) += op_model_mipsxx.o
oprofile-$(CONFIG_CPU_RM9000) += op_model_rm9000.o
+oprofile-$(CONFIG_CPU_LOONGSON2) += op_model_loongson2e.o
diff -urN b/arch/mips/oprofile/common.c a/arch/mips/oprofile/common.c
--- b/arch/mips/oprofile/common.c 2007-07-24 12:59:33.000000000 +0800
+++ a/arch/mips/oprofile/common.c 2007-07-24 08:10:27.000000000 +0800
@@ -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_loongson2e_ops __attribute__((weak));
static struct op_mips_model *model;
@@ -93,6 +94,10 @@
lmodel = &op_model_rm9000_ops;
break;
+ case CPU_LOONGSON2:
+ lmodel = &op_model_loongson2e_ops;
+ break;
+
};
if (!lmodel)
diff -urN b/arch/mips/oprofile/op_model_loongson2e.c
a/arch/mips/oprofile/op_model_loongson2e.c
--- b/arch/mips/oprofile/op_model_loongson2e.c 1970-01-01
08:00:00.000000000 +0800
+++ a/arch/mips/oprofile/op_model_loongson2e.c 2007-07-24
13:03:01.000000000 +0800
@@ -0,0 +1,170 @@
+/*
+ * 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) 2007 by Dajie Tan <jiankemeng@xxxxxxxxx>
+ */
+
+#include <linux/init.h>
+#include <linux/oprofile.h>
+#include <linux/interrupt.h>
+#include <linux/smp.h>
+
+#include "op_impl.h"
+
+#define GODSON2E_PERFCTL_EXL (1UL << 0)
+#define GODSON2E_PERFCTL_KERNEL (1UL << 1)
+#define GODSON2E_PERFCTL_SUPERVISOR (1UL << 2)
+#define GODSON2E_PERFCTL_USER (1UL << 3)
+#define GODSON2E_PERFCTL_INTERRUPT_ENABLE (1UL << 4)
+#define GODSON2E_PERFCTL_OVERFLOW (1ULL << 31)
+
+#define GODSON2E_COUNTER1_EVENT(event) ((event) << 5)
+#define GODSON2E_COUNTER2_EVENT(event) ((event) << 9)
+
+
+/* IP6 --- performance counter overflow */
+static int loongson2e_pmc_irq = MIPS_CPU_IRQ_BASE + 6;
+
+
+static struct loongson2e_register_config {
+ unsigned int control;
+ unsigned int reset_counter1;
+ unsigned int reset_counter2;
+ int c1_enabled;
+ int c2_enabled;
+} reg;
+
+/* Compute all of the registers in preparation for enabling profiling. */
+
+static void loongson2e_reg_setup(struct op_counter_config *ctr)
+{
+ unsigned int control = 0;
+
+ /* Compute the performance counter control word. */
+ /* For now count kernel and user mode */
+ if (ctr[0].enabled)
+ control |= GODSON2E_COUNTER1_EVENT(ctr[0].event) |
+ GODSON2E_PERFCTL_INTERRUPT_ENABLE;
+ else
+ control |= GODSON2E_COUNTER1_EVENT(0xe);
+
+ if (ctr[1].enabled)
+ control |= GODSON2E_COUNTER2_EVENT(ctr[1].event) |
+ GODSON2E_PERFCTL_INTERRUPT_ENABLE;
+ else
+ control |= GODSON2E_COUNTER2_EVENT(0x3);
+
+ if (ctr[0].kernel || ctr[1].kernel)
+ control |= GODSON2E_PERFCTL_KERNEL;
+ else
+ control &= ~GODSON2E_PERFCTL_KERNEL;
+
+ if (ctr[0].user || ctr[1].user)
+ control |= GODSON2E_PERFCTL_USER;
+ else
+ control &= ~GODSON2E_PERFCTL_USER;
+
+ if (ctr[0].exl || ctr[1].exl)
+ control |= GODSON2E_PERFCTL_EXL;
+ else
+ control &= ~GODSON2E_PERFCTL_EXL;
+
+ reg.control = control;
+
+ reg.c1_enabled = ctr[0].enabled;
+ reg.c2_enabled = ctr[1].enabled;
+ reg.reset_counter1 = ctr[0].count ? 0x80000000 - ctr[0].count : 0;
+ reg.reset_counter2 = ctr[1].count ? 0x80000000 - ctr[1].count : 0;
+}
+
+static void loongson2e_cpu_setup (void *args)
+{
+ uint64_t perfcount;
+ perfcount = ((uint64_t) reg.reset_counter2 << 32) | reg.reset_counter1;
+ write_c0_pmc_count(perfcount);
+}
+
+static void loongson2e_cpu_start(void *args)
+{
+ /* Start all counters */
+ write_c0_pmc_control(reg.control);
+}
+
+static void loongson2e_cpu_stop(void *args)
+{
+ /* Stop all counters */
+ write_c0_pmc_control(0);
+}
+
+
+static irqreturn_t loongson2e_pmc_handler(int irq, void * dev_id)
+{
+ uint32_t counter1, counter2;
+ uint64_t counters;
+ uint64_t tmp = 0x0;
+ struct pt_regs *regs = get_irq_regs();
+
+ /*
+ * Godson2e combines two 32-bit performance counters into a single
+ * 64-bit coprocessor zero register. To avoid a race updating the
+ * registers we need to stop the counters while we're messing with
+ * them ...
+ */
+
+ write_c0_pmc_control(tmp);
+
+ counters = read_c0_pmc_count();
+ counter1 = counters;
+ counter2 = counters >> 32;
+
+ if (reg.c2_enabled && counter2 & GODSON2E_PERFCTL_OVERFLOW) {
+ oprofile_add_sample(regs, 1);
+ counter2 = reg.reset_counter2;
+ }
+
+ if (reg.c1_enabled && counter1 & GODSON2E_PERFCTL_OVERFLOW) {
+ oprofile_add_sample(regs, 0);
+ counter1 = reg.reset_counter1;
+ }
+
+ counters = ((uint64_t)counter2 << 32) | counter1;
+
+ write_c0_pmc_count(counters);
+ write_c0_pmc_control(reg.control);
+
+ return IRQ_HANDLED;
+}
+
+static int __init loongson2e_init(void)
+{
+ uint64_t tmp = 0;
+ write_c0_pmc_control(0);
+ write_c0_pmc_count(tmp);
+
+ return request_irq(loongson2e_pmc_irq, loongson2e_pmc_handler,
+ IRQF_DISABLED, "Perfcounter", NULL);
+}
+
+static void loongson2e_exit(void)
+{
+ uint64_t tmp = 0;
+ write_c0_pmc_control(0);
+ write_c0_pmc_count(tmp);
+
+ free_irq(loongson2e_pmc_irq, NULL);
+}
+
+struct op_mips_model op_model_loongson2e_ops = {
+ .reg_setup = loongson2e_reg_setup,
+ .cpu_setup = loongson2e_cpu_setup,
+ .init = loongson2e_init,
+ .exit = loongson2e_exit,
+ .cpu_start = loongson2e_cpu_start,
+ .cpu_stop = loongson2e_cpu_stop,
+ .cpu_type = "mips/loongson2e",
+ .num_counters = 2
+};
+
+
diff -urN b/include/asm-mips/mipsregs.h a/include/asm-mips/mipsregs.h
--- b/include/asm-mips/mipsregs.h 2007-07-24 13:02:29.000000000 +0800
+++ a/include/asm-mips/mipsregs.h 2007-07-19 08:22:44.000000000 +0800
@@ -594,6 +594,58 @@
: "r" (val), "i" (counter)); \
} while (0)
+
+/*
+ * Macros to access the loongson2e system control coprocessor
+ */
+#define __read_64bit_c0_pmc_split(source, sel) \
+({ \
+ unsigned long long val; \
+ unsigned long flags; \
+ \
+ local_irq_save(flags); \
+ if (sel == 0) \
+ __asm__ __volatile__( \
+ ".set\tmips64\n\t" \
+ "dmfc0\t%M0, " #source "\n\t" \
+ "dsll\t%L0, %M0, 32\n\t" \
+ "dsra\t%M0, %M0, 32\n\t" \
+ "dsra\t%L0, %L0, 32\n\t" \
+ ".set\tmips0" \
+ : "=r" (val)); \
+ else \
+ __asm__ __volatile__( \
+ ".set\tmips64\n\t" \
+ "dmfc0\t%M0, " #source ", " #sel "\n\t" \
+ "dsll\t%L0, %M0, 32\n\t" \
+ "dsra\t%M0, %M0, 32\n\t" \
+ "dsra\t%L0, %L0, 32\n\t" \
+ ".set\tmips0" \
+ : "=r" (val)); \
+ local_irq_restore(flags); \
+ \
+ val; \
+})
+
+#define __read_64bit_c0_pmc(source, sel) \
+({ unsigned long long __res; \
+ if (sizeof(unsigned long) == 4) \
+ __res = __read_64bit_c0_pmc_split(source, sel); \
+ else if (sel == 0) \
+ __asm__ __volatile__( \
+ ".set\tmips3\n\t" \
+ "dmfc0\t%0, " #source "\n\t" \
+ ".set\tmips0" \
+ : "=r" (__res)); \
+ else \
+ __asm__ __volatile__( \
+ ".set\tmips64\n\t" \
+ "dmfc0\t%0, " #source ", " #sel "\n\t" \
+ ".set\tmips0" \
+ : "=r" (__res)); \
+ __res; \
+})
+
/*
* Macros to access the system control coprocessor
*/
@@ -896,6 +948,14 @@
#define read_c0_framemask() __read_32bit_c0_register($21, 0)
#define write_c0_framemask(val) __write_32bit_c0_register($21, 0, val)
+/* Loongson2e PMC control register */
+#define read_c0_pmc_control() __read_32bit_c0_register($24, 0)
+#define write_c0_pmc_control(val) __write_32bit_c0_register($24, 0, val)
+
+/* Loongson2e PMC counter register */
+#define read_c0_pmc_count() __read_64bit_c0_pmc($25, 0)
+#define write_c0_pmc_count(val) __write_64bit_c0_register($25, 0, val)
+
/* RM9000 PerfControl performance counter control register */
#define read_c0_perfcontrol() __read_32bit_c0_register($22, 0)
#define write_c0_perfcontrol(val) __write_32bit_c0_register($22, 0, val)
diff -urN b/drivers/oprofile/cpu_buffer.c a/drivers/oprofile/cpu_buffer.c
--- b/drivers/oprofile/cpu_buffer.c 2007-07-24 13:00:54.000000000 +0800
+++ a/drivers/oprofile/cpu_buffer.c 2007-07-19 08:22:15.000000000 +0800
@@ -148,6 +148,10 @@
unsigned long pc, unsigned long event)
{
struct op_sample * entry = &cpu_buf->buffer[cpu_buf->head_pos];
+
+ if(!entry)
+ return;
+
entry->eip = pc;
entry->event = event;
increment_head(cpu_buf);
