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/cpumask.h>
10 #include <linux/oprofile.h>
11 #include <linux/interrupt.h>
12 #include <linux/smp.h>
13 #include <asm/irq_regs.h>
17 #define M_PERFCTL_EXL (1UL << 0)
18 #define M_PERFCTL_KERNEL (1UL << 1)
19 #define M_PERFCTL_SUPERVISOR (1UL << 2)
20 #define M_PERFCTL_USER (1UL << 3)
21 #define M_PERFCTL_INTERRUPT_ENABLE (1UL << 4)
22 #define M_PERFCTL_EVENT(event) (((event) & 0x3ff) << 5)
23 #define M_PERFCTL_VPEID(vpe) ((vpe) << 16)
24 #define M_PERFCTL_MT_EN(filter) ((filter) << 20)
25 #define M_TC_EN_ALL M_PERFCTL_MT_EN(0)
26 #define M_TC_EN_VPE M_PERFCTL_MT_EN(1)
27 #define M_TC_EN_TC M_PERFCTL_MT_EN(2)
28 #define M_PERFCTL_TCID(tcid) ((tcid) << 22)
29 #define M_PERFCTL_WIDE (1UL << 30)
30 #define M_PERFCTL_MORE (1UL << 31)
32 #define M_COUNTER_OVERFLOW (1UL << 31)
34 #ifdef CONFIG_MIPS_MT_SMP
35 #define WHAT (M_TC_EN_VPE | M_PERFCTL_VPEID(smp_processor_id()))
36 #define vpe_id() smp_processor_id()
39 * The number of bits to shift to convert between counters per core and
40 * counters per VPE. There is no reasonable interface atm to obtain the
41 * number of VPEs used by Linux and in the 34K this number is fixed to two
42 * anyways so we hardcore a few things here for the moment. The way it's
43 * done here will ensure that oprofile VSMP kernel will run right on a lesser
44 * core like a 24K also or with maxcpus=1.
46 static inline unsigned int vpe_shift(void)
48 if (num_possible_cpus() > 1)
59 static inline unsigned int vpe_shift(void)
66 static inline unsigned int counters_total_to_per_cpu(unsigned int counters
)
68 return counters
>> vpe_shift();
71 static inline unsigned int counters_per_cpu_to_total(unsigned int counters
)
73 return counters
<< vpe_shift();
76 #define __define_perf_accessors(r, n, np) \
78 static inline unsigned int r_c0_ ## r ## n(void) \
80 unsigned int cpu = vpe_id(); \
84 return read_c0_ ## r ## n(); \
86 return read_c0_ ## r ## np(); \
93 static inline void w_c0_ ## r ## n(unsigned int value) \
95 unsigned int cpu = vpe_id(); \
99 write_c0_ ## r ## n(value); \
102 write_c0_ ## r ## np(value); \
110 __define_perf_accessors(perfcntr, 0, 2)
111 __define_perf_accessors(perfcntr
, 1, 3)
112 __define_perf_accessors(perfcntr
, 2, 0)
113 __define_perf_accessors(perfcntr
, 3, 1)
115 __define_perf_accessors(perfctrl
, 0, 2)
116 __define_perf_accessors(perfctrl
, 1, 3)
117 __define_perf_accessors(perfctrl
, 2, 0)
118 __define_perf_accessors(perfctrl
, 3, 1)
120 struct op_mips_model op_model_mipsxx_ops
;
122 static struct mipsxx_register_config
{
123 unsigned int control
[4];
124 unsigned int counter
[4];
127 /* Compute all of the registers in preparation for enabling profiling. */
129 static void mipsxx_reg_setup(struct op_counter_config
*ctr
)
131 unsigned int counters
= op_model_mipsxx_ops
.num_counters
;
134 /* Compute the performance counter control word. */
135 for (i
= 0; i
< counters
; i
++) {
142 reg
.control
[i
] = M_PERFCTL_EVENT(ctr
[i
].event
) |
143 M_PERFCTL_INTERRUPT_ENABLE
;
145 reg
.control
[i
] |= M_PERFCTL_KERNEL
;
147 reg
.control
[i
] |= M_PERFCTL_USER
;
149 reg
.control
[i
] |= M_PERFCTL_EXL
;
150 reg
.counter
[i
] = 0x80000000 - ctr
[i
].count
;
154 /* Program all of the registers in preparation for enabling profiling. */
156 static void mipsxx_cpu_setup(void *args
)
158 unsigned int counters
= op_model_mipsxx_ops
.num_counters
;
163 w_c0_perfcntr3(reg
.counter
[3]);
166 w_c0_perfcntr2(reg
.counter
[2]);
169 w_c0_perfcntr1(reg
.counter
[1]);
172 w_c0_perfcntr0(reg
.counter
[0]);
176 /* Start all counters on current CPU */
177 static void mipsxx_cpu_start(void *args
)
179 unsigned int counters
= op_model_mipsxx_ops
.num_counters
;
183 w_c0_perfctrl3(WHAT
| reg
.control
[3]);
185 w_c0_perfctrl2(WHAT
| reg
.control
[2]);
187 w_c0_perfctrl1(WHAT
| reg
.control
[1]);
189 w_c0_perfctrl0(WHAT
| reg
.control
[0]);
193 /* Stop all counters on current CPU */
194 static void mipsxx_cpu_stop(void *args
)
196 unsigned int counters
= op_model_mipsxx_ops
.num_counters
;
210 static int mipsxx_perfcount_handler(void)
212 unsigned int counters
= op_model_mipsxx_ops
.num_counters
;
213 unsigned int control
;
214 unsigned int counter
;
215 int handled
= IRQ_NONE
;
217 if (cpu_has_mips_r2
&& !(read_c0_cause() & (1 << 26)))
221 #define HANDLE_COUNTER(n) \
223 control = r_c0_perfctrl ## n(); \
224 counter = r_c0_perfcntr ## n(); \
225 if ((control & M_PERFCTL_INTERRUPT_ENABLE) && \
226 (counter & M_COUNTER_OVERFLOW)) { \
227 oprofile_add_sample(get_irq_regs(), n); \
228 w_c0_perfcntr ## n(reg.counter[n]); \
229 handled = IRQ_HANDLED; \
240 #define M_CONFIG1_PC (1 << 4)
242 static inline int __n_counters(void)
244 if (!(read_c0_config1() & M_CONFIG1_PC
))
246 if (!(r_c0_perfctrl0() & M_PERFCTL_MORE
))
248 if (!(r_c0_perfctrl1() & M_PERFCTL_MORE
))
250 if (!(r_c0_perfctrl2() & M_PERFCTL_MORE
))
256 static inline int n_counters(void)
260 switch (current_cpu_type()) {
271 counters
= __n_counters();
277 static inline void reset_counters(int counters
)
295 static int __init
mipsxx_init(void)
299 counters
= n_counters();
301 printk(KERN_ERR
"Oprofile: CPU has no performance counters\n");
305 reset_counters(counters
);
307 counters
= counters_total_to_per_cpu(counters
);
309 op_model_mipsxx_ops
.num_counters
= counters
;
310 switch (current_cpu_type()) {
312 op_model_mipsxx_ops
.cpu_type
= "mips/20K";
316 op_model_mipsxx_ops
.cpu_type
= "mips/24K";
320 op_model_mipsxx_ops
.cpu_type
= "mips/25K";
324 op_model_mipsxx_ops
.cpu_type
= "mips/34K";
328 op_model_mipsxx_ops
.cpu_type
= "mips/74K";
332 op_model_mipsxx_ops
.cpu_type
= "mips/5K";
336 if ((current_cpu_data
.processor_id
& 0xff) == 0x20)
337 op_model_mipsxx_ops
.cpu_type
= "mips/r10000-v2.x";
339 op_model_mipsxx_ops
.cpu_type
= "mips/r10000";
344 op_model_mipsxx_ops
.cpu_type
= "mips/r12000";
349 op_model_mipsxx_ops
.cpu_type
= "mips/sb1";
353 printk(KERN_ERR
"Profiling unsupported for this CPU\n");
358 perf_irq
= mipsxx_perfcount_handler
;
363 static void mipsxx_exit(void)
365 int counters
= op_model_mipsxx_ops
.num_counters
;
367 counters
= counters_per_cpu_to_total(counters
);
368 reset_counters(counters
);
370 perf_irq
= null_perf_irq
;
373 struct op_mips_model op_model_mipsxx_ops
= {
374 .reg_setup
= mipsxx_reg_setup
,
375 .cpu_setup
= mipsxx_cpu_setup
,
378 .cpu_start
= mipsxx_cpu_start
,
379 .cpu_stop
= mipsxx_cpu_stop
,