2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 2004, 05, 06 by Ralf Baechle
7 * Copyright (C) 2005 by MIPS Technologies, Inc.
9 #include <linux/oprofile.h>
10 #include <linux/interrupt.h>
11 #include <linux/smp.h>
12 #include <asm/irq_regs.h>
16 #define M_PERFCTL_EXL (1UL << 0)
17 #define M_PERFCTL_KERNEL (1UL << 1)
18 #define M_PERFCTL_SUPERVISOR (1UL << 2)
19 #define M_PERFCTL_USER (1UL << 3)
20 #define M_PERFCTL_INTERRUPT_ENABLE (1UL << 4)
21 #define M_PERFCTL_EVENT(event) ((event) << 5)
22 #define M_PERFCTL_VPEID(vpe) ((vpe) << 16)
23 #define M_PERFCTL_MT_EN(filter) ((filter) << 20)
24 #define M_TC_EN_ALL M_PERFCTL_MT_EN(0)
25 #define M_TC_EN_VPE M_PERFCTL_MT_EN(1)
26 #define M_TC_EN_TC M_PERFCTL_MT_EN(2)
27 #define M_PERFCTL_TCID(tcid) ((tcid) << 22)
28 #define M_PERFCTL_WIDE (1UL << 30)
29 #define M_PERFCTL_MORE (1UL << 31)
31 #define M_COUNTER_OVERFLOW (1UL << 31)
33 #ifdef CONFIG_MIPS_MT_SMP
34 #define WHAT (M_TC_EN_VPE | M_PERFCTL_VPEID(smp_processor_id()))
39 #define __define_perf_accessors(r, n, np) \
41 static inline unsigned int r_c0_ ## r ## n(void) \
43 unsigned int cpu = smp_processor_id(); \
47 return read_c0_ ## r ## n(); \
49 return read_c0_ ## r ## np(); \
56 static inline void w_c0_ ## r ## n(unsigned int value) \
58 unsigned int cpu = smp_processor_id(); \
62 write_c0_ ## r ## n(value); \
65 write_c0_ ## r ## np(value); \
73 __define_perf_accessors(perfcntr, 0, 2)
74 __define_perf_accessors(perfcntr, 1, 3)
75 __define_perf_accessors(perfcntr, 2, 2)
76 __define_perf_accessors(perfcntr, 3, 2)
78 __define_perf_accessors(perfctrl, 0, 2)
79 __define_perf_accessors(perfctrl, 1, 3)
80 __define_perf_accessors(perfctrl, 2, 2)
81 __define_perf_accessors(perfctrl, 3, 2)
83 struct op_mips_model op_model_mipsxx_ops;
85 static struct mipsxx_register_config {
86 unsigned int control[4];
87 unsigned int counter[4];
90 /* Compute all of the registers in preparation for enabling profiling. */
92 static void mipsxx_reg_setup(struct op_counter_config *ctr)
94 unsigned int counters = op_model_mipsxx_ops.num_counters;
97 /* Compute the performance counter control word. */
98 /* For now count kernel and user mode */
99 for (i = 0; i < counters; i++) {
106 reg.control[i] = M_PERFCTL_EVENT(ctr[i].event) |
107 M_PERFCTL_INTERRUPT_ENABLE;
109 reg.control[i] |= M_PERFCTL_KERNEL;
111 reg.control[i] |= M_PERFCTL_USER;
113 reg.control[i] |= M_PERFCTL_EXL;
114 reg.counter[i] = 0x80000000 - ctr[i].count;
118 /* Program all of the registers in preparation for enabling profiling. */
120 static void mipsxx_cpu_setup (void *args)
122 unsigned int counters = op_model_mipsxx_ops.num_counters;
127 w_c0_perfcntr3(reg.counter[3]);
130 w_c0_perfcntr2(reg.counter[2]);
133 w_c0_perfcntr1(reg.counter[1]);
136 w_c0_perfcntr0(reg.counter[0]);
140 /* Start all counters on current CPU */
141 static void mipsxx_cpu_start(void *args)
143 unsigned int counters = op_model_mipsxx_ops.num_counters;
147 w_c0_perfctrl3(WHAT | reg.control[3]);
149 w_c0_perfctrl2(WHAT | reg.control[2]);
151 w_c0_perfctrl1(WHAT | reg.control[1]);
153 w_c0_perfctrl0(WHAT | reg.control[0]);
157 /* Stop all counters on current CPU */
158 static void mipsxx_cpu_stop(void *args)
160 unsigned int counters = op_model_mipsxx_ops.num_counters;
174 static int mipsxx_perfcount_handler(void)
176 unsigned int counters = op_model_mipsxx_ops.num_counters;
177 unsigned int control;
178 unsigned int counter;
182 #define HANDLE_COUNTER(n) \
184 control = r_c0_perfctrl ## n(); \
185 counter = r_c0_perfcntr ## n(); \
186 if ((control & M_PERFCTL_INTERRUPT_ENABLE) && \
187 (counter & M_COUNTER_OVERFLOW)) { \
188 oprofile_add_sample(get_irq_regs(), n); \
189 w_c0_perfcntr ## n(reg.counter[n]); \
201 #define M_CONFIG1_PC (1 << 4)
203 static inline int __n_counters(void)
205 if (!(read_c0_config1() & M_CONFIG1_PC))
207 if (!(r_c0_perfctrl0() & M_PERFCTL_MORE))
209 if (!(r_c0_perfctrl1() & M_PERFCTL_MORE))
211 if (!(r_c0_perfctrl2() & M_PERFCTL_MORE))
217 static inline int n_counters(void)
219 int counters = __n_counters();
222 if (current_cpu_data.cputype == CPU_34K)
223 return counters >> 1;
229 static inline void reset_counters(int counters)
247 static int __init mipsxx_init(void)
251 counters = n_counters();
253 printk(KERN_ERR "Oprofile: CPU has no performance counters\n");
257 reset_counters(counters);
259 op_model_mipsxx_ops.num_counters = counters;
260 switch (current_cpu_data.cputype) {
262 op_model_mipsxx_ops.cpu_type = "mips/20K";
266 op_model_mipsxx_ops.cpu_type = "mips/24K";
270 op_model_mipsxx_ops.cpu_type = "mips/25K";
274 op_model_mipsxx_ops.cpu_type = "mips/34K";
278 op_model_mipsxx_ops.cpu_type = "mips/74K";
282 op_model_mipsxx_ops.cpu_type = "mips/5K";
287 op_model_mipsxx_ops.cpu_type = "mips/sb1";
291 printk(KERN_ERR "Profiling unsupported for this CPU\n");
296 perf_irq = mipsxx_perfcount_handler;
301 static void mipsxx_exit(void)
303 reset_counters(op_model_mipsxx_ops.num_counters);
305 perf_irq = null_perf_irq;
308 struct op_mips_model op_model_mipsxx_ops = {
309 .reg_setup = mipsxx_reg_setup,
310 .cpu_setup = mipsxx_cpu_setup,
313 .cpu_start = mipsxx_cpu_start,
314 .cpu_stop = mipsxx_cpu_stop,