[POWERPC] re-enable OProfile for iSeries, using timer interrupt
[linux-2.6.git] / arch / powerpc / oprofile / common.c
1 /*
2  * PPC 64 oprofile support:
3  * Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
4  * PPC 32 oprofile support: (based on PPC 64 support)
5  * Copyright (C) Freescale Semiconductor, Inc 2004
6  *      Author: Andy Fleming
7  *
8  * Based on alpha version.
9  *
10  * This program is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU General Public License
12  * as published by the Free Software Foundation; either version
13  * 2 of the License, or (at your option) any later version.
14  */
15
16 #include <linux/oprofile.h>
17 #include <linux/init.h>
18 #include <linux/smp.h>
19 #include <linux/errno.h>
20 #include <asm/ptrace.h>
21 #include <asm/system.h>
22 #include <asm/pmc.h>
23 #include <asm/cputable.h>
24 #include <asm/oprofile_impl.h>
25 #include <asm/firmware.h>
26
27 static struct op_powerpc_model *model;
28
29 static struct op_counter_config ctr[OP_MAX_COUNTER];
30 static struct op_system_config sys;
31
32 static void op_handle_interrupt(struct pt_regs *regs)
33 {
34         model->handle_interrupt(regs, ctr);
35 }
36
37 static int op_powerpc_setup(void)
38 {
39         int err;
40
41         /* Grab the hardware */
42         err = reserve_pmc_hardware(op_handle_interrupt);
43         if (err)
44                 return err;
45
46         /* Pre-compute the values to stuff in the hardware registers.  */
47         model->reg_setup(ctr, &sys, model->num_counters);
48
49         /* Configure the registers on all cpus.  */
50         on_each_cpu(model->cpu_setup, NULL, 0, 1);
51
52         return 0;
53 }
54
55 static void op_powerpc_shutdown(void)
56 {
57         release_pmc_hardware();
58 }
59
60 static void op_powerpc_cpu_start(void *dummy)
61 {
62         model->start(ctr);
63 }
64
65 static int op_powerpc_start(void)
66 {
67         on_each_cpu(op_powerpc_cpu_start, NULL, 0, 1);
68         return 0;
69 }
70
71 static inline void op_powerpc_cpu_stop(void *dummy)
72 {
73         model->stop();
74 }
75
76 static void op_powerpc_stop(void)
77 {
78         on_each_cpu(op_powerpc_cpu_stop, NULL, 0, 1);
79 }
80
81 static int op_powerpc_create_files(struct super_block *sb, struct dentry *root)
82 {
83         int i;
84
85 #ifdef CONFIG_PPC64
86         /*
87          * There is one mmcr0, mmcr1 and mmcra for setting the events for
88          * all of the counters.
89          */
90         oprofilefs_create_ulong(sb, root, "mmcr0", &sys.mmcr0);
91         oprofilefs_create_ulong(sb, root, "mmcr1", &sys.mmcr1);
92         oprofilefs_create_ulong(sb, root, "mmcra", &sys.mmcra);
93 #endif
94
95         for (i = 0; i < model->num_counters; ++i) {
96                 struct dentry *dir;
97                 char buf[3];
98
99                 snprintf(buf, sizeof buf, "%d", i);
100                 dir = oprofilefs_mkdir(sb, root, buf);
101
102                 oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
103                 oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
104                 oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
105
106                 /*
107                  * Classic PowerPC doesn't support per-counter
108                  * control like this, but the options are
109                  * expected, so they remain.  For Freescale
110                  * Book-E style performance monitors, we do
111                  * support them.
112                  */
113                 oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
114                 oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
115
116                 oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
117         }
118
119         oprofilefs_create_ulong(sb, root, "enable_kernel", &sys.enable_kernel);
120         oprofilefs_create_ulong(sb, root, "enable_user", &sys.enable_user);
121
122         /* Default to tracing both kernel and user */
123         sys.enable_kernel = 1;
124         sys.enable_user = 1;
125
126         return 0;
127 }
128
129 int __init oprofile_arch_init(struct oprofile_operations *ops)
130 {
131         if (!cur_cpu_spec->oprofile_cpu_type)
132                 return -ENODEV;
133
134         if (firmware_has_feature(FW_FEATURE_ISERIES))
135                 return -ENODEV;
136
137         switch (cur_cpu_spec->oprofile_type) {
138 #ifdef CONFIG_PPC64
139                 case PPC_OPROFILE_RS64:
140                         model = &op_model_rs64;
141                         break;
142                 case PPC_OPROFILE_POWER4:
143                         model = &op_model_power4;
144                         break;
145 #else
146                 case PPC_OPROFILE_G4:
147                         model = &op_model_7450;
148                         break;
149 #endif
150 #ifdef CONFIG_FSL_BOOKE
151                 case PPC_OPROFILE_BOOKE:
152                         model = &op_model_fsl_booke;
153                         break;
154 #endif
155                 default:
156                         return -ENODEV;
157         }
158
159         model->num_counters = cur_cpu_spec->num_pmcs;
160
161         ops->cpu_type = cur_cpu_spec->oprofile_cpu_type;
162         ops->create_files = op_powerpc_create_files;
163         ops->setup = op_powerpc_setup;
164         ops->shutdown = op_powerpc_shutdown;
165         ops->start = op_powerpc_start;
166         ops->stop = op_powerpc_stop;
167         ops->backtrace = op_powerpc_backtrace;
168
169         printk(KERN_DEBUG "oprofile: using %s performance monitoring.\n",
170                ops->cpu_type);
171
172         return 0;
173 }
174
175 void oprofile_arch_exit(void)
176 {
177 }