[PATCH] powerpc: Remove oprofile spinlock backtrace code
[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
26 static struct op_powerpc_model *model;
27
28 static struct op_counter_config ctr[OP_MAX_COUNTER];
29 static struct op_system_config sys;
30
31 static void op_handle_interrupt(struct pt_regs *regs)
32 {
33         model->handle_interrupt(regs, ctr);
34 }
35
36 static int op_powerpc_setup(void)
37 {
38         int err;
39
40         /* Grab the hardware */
41         err = reserve_pmc_hardware(op_handle_interrupt);
42         if (err)
43                 return err;
44
45         /* Pre-compute the values to stuff in the hardware registers.  */
46         model->reg_setup(ctr, &sys, model->num_counters);
47
48         /* Configure the registers on all cpus.  */
49         on_each_cpu(model->cpu_setup, NULL, 0, 1);
50
51         return 0;
52 }
53
54 static void op_powerpc_shutdown(void)
55 {
56         release_pmc_hardware();
57 }
58
59 static void op_powerpc_cpu_start(void *dummy)
60 {
61         model->start(ctr);
62 }
63
64 static int op_powerpc_start(void)
65 {
66         on_each_cpu(op_powerpc_cpu_start, NULL, 0, 1);
67         return 0;
68 }
69
70 static inline void op_powerpc_cpu_stop(void *dummy)
71 {
72         model->stop();
73 }
74
75 static void op_powerpc_stop(void)
76 {
77         on_each_cpu(op_powerpc_cpu_stop, NULL, 0, 1);
78 }
79
80 static int op_powerpc_create_files(struct super_block *sb, struct dentry *root)
81 {
82         int i;
83
84 #ifdef CONFIG_PPC64
85         /*
86          * There is one mmcr0, mmcr1 and mmcra for setting the events for
87          * all of the counters.
88          */
89         oprofilefs_create_ulong(sb, root, "mmcr0", &sys.mmcr0);
90         oprofilefs_create_ulong(sb, root, "mmcr1", &sys.mmcr1);
91         oprofilefs_create_ulong(sb, root, "mmcra", &sys.mmcra);
92 #endif
93
94         for (i = 0; i < model->num_counters; ++i) {
95                 struct dentry *dir;
96                 char buf[3];
97
98                 snprintf(buf, sizeof buf, "%d", i);
99                 dir = oprofilefs_mkdir(sb, root, buf);
100
101                 oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
102                 oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
103                 oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
104
105                 /*
106                  * Classic PowerPC doesn't support per-counter
107                  * control like this, but the options are
108                  * expected, so they remain.  For Freescale
109                  * Book-E style performance monitors, we do
110                  * support them.
111                  */
112                 oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
113                 oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
114
115                 oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
116         }
117
118         oprofilefs_create_ulong(sb, root, "enable_kernel", &sys.enable_kernel);
119         oprofilefs_create_ulong(sb, root, "enable_user", &sys.enable_user);
120
121         /* Default to tracing both kernel and user */
122         sys.enable_kernel = 1;
123         sys.enable_user = 1;
124
125         return 0;
126 }
127
128 int __init oprofile_arch_init(struct oprofile_operations *ops)
129 {
130         if (!cur_cpu_spec->oprofile_cpu_type)
131                 return -ENODEV;
132
133         switch (cur_cpu_spec->oprofile_type) {
134 #ifdef CONFIG_PPC64
135                 case PPC_OPROFILE_RS64:
136                         model = &op_model_rs64;
137                         break;
138                 case PPC_OPROFILE_POWER4:
139                         model = &op_model_power4;
140                         break;
141 #else
142                 case PPC_OPROFILE_G4:
143                         model = &op_model_7450;
144                         break;
145 #endif
146 #ifdef CONFIG_FSL_BOOKE
147                 case PPC_OPROFILE_BOOKE:
148                         model = &op_model_fsl_booke;
149                         break;
150 #endif
151                 default:
152                         return -ENODEV;
153         }
154
155         model->num_counters = cur_cpu_spec->num_pmcs;
156
157         ops->cpu_type = cur_cpu_spec->oprofile_cpu_type;
158         ops->create_files = op_powerpc_create_files;
159         ops->setup = op_powerpc_setup;
160         ops->shutdown = op_powerpc_shutdown;
161         ops->start = op_powerpc_start;
162         ops->stop = op_powerpc_stop;
163         ops->backtrace = op_powerpc_backtrace;
164
165         printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
166                ops->cpu_type);
167
168         return 0;
169 }
170
171 void oprofile_arch_exit(void)
172 {
173 }