3e8daabf10218ec6b2a4ea54a1441da3aa9543e2
[linux-2.6.git] / arch / ppc64 / oprofile / common.c
1 /*
2  * Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
3  *
4  * Based on alpha version.
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version
9  * 2 of the License, or (at your option) any later version.
10  */
11
12 #include <linux/oprofile.h>
13 #include <linux/init.h>
14 #include <linux/smp.h>
15 #include <linux/errno.h>
16 #include <asm/ptrace.h>
17 #include <asm/system.h>
18 #include <asm/pmc.h>
19 #include <asm/cputable.h>
20 #include <asm/oprofile_impl.h>
21
22 static struct op_ppc64_model *model;
23
24 static struct op_counter_config ctr[OP_MAX_COUNTER];
25 static struct op_system_config sys;
26
27 static void op_handle_interrupt(struct pt_regs *regs)
28 {
29         model->handle_interrupt(regs, ctr);
30 }
31
32 static int op_ppc64_setup(void)
33 {
34         int err;
35
36         /* Grab the hardware */
37         err = reserve_pmc_hardware(op_handle_interrupt);
38         if (err)
39                 return err;
40
41         /* Pre-compute the values to stuff in the hardware registers.  */
42         model->reg_setup(ctr, &sys, model->num_counters);
43
44         /* Configure the registers on all cpus.  */
45         on_each_cpu(model->cpu_setup, NULL, 0, 1);
46
47         return 0;
48 }
49
50 static void op_ppc64_shutdown(void)
51 {
52         release_pmc_hardware();
53 }
54
55 static void op_ppc64_cpu_start(void *dummy)
56 {
57         model->start(ctr);
58 }
59
60 static int op_ppc64_start(void)
61 {
62         on_each_cpu(op_ppc64_cpu_start, NULL, 0, 1);
63         return 0;
64 }
65
66 static inline void op_ppc64_cpu_stop(void *dummy)
67 {
68         model->stop();
69 }
70
71 static void op_ppc64_stop(void)
72 {
73         on_each_cpu(op_ppc64_cpu_stop, NULL, 0, 1);
74 }
75
76 static int op_ppc64_create_files(struct super_block *sb, struct dentry *root)
77 {
78         int i;
79
80         /*
81          * There is one mmcr0, mmcr1 and mmcra for setting the events for
82          * all of the counters.
83          */
84         oprofilefs_create_ulong(sb, root, "mmcr0", &sys.mmcr0);
85         oprofilefs_create_ulong(sb, root, "mmcr1", &sys.mmcr1);
86         oprofilefs_create_ulong(sb, root, "mmcra", &sys.mmcra);
87
88         for (i = 0; i < model->num_counters; ++i) {
89                 struct dentry *dir;
90                 char buf[3];
91
92                 snprintf(buf, sizeof buf, "%d", i);
93                 dir = oprofilefs_mkdir(sb, root, buf);
94
95                 oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
96                 oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
97                 oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
98                 /*
99                  * We dont support per counter user/kernel selection, but
100                  * we leave the entries because userspace expects them
101                  */
102                 oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
103                 oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
104                 oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
105         }
106
107         oprofilefs_create_ulong(sb, root, "enable_kernel", &sys.enable_kernel);
108         oprofilefs_create_ulong(sb, root, "enable_user", &sys.enable_user);
109         oprofilefs_create_ulong(sb, root, "backtrace_spinlocks",
110                                 &sys.backtrace_spinlocks);
111
112         /* Default to tracing both kernel and user */
113         sys.enable_kernel = 1;
114         sys.enable_user = 1;
115
116         /* Turn on backtracing through spinlocks by default */
117         sys.backtrace_spinlocks = 1;
118
119         return 0;
120 }
121
122 int __init oprofile_arch_init(struct oprofile_operations *ops)
123 {
124         unsigned int pvr;
125
126         pvr = mfspr(SPRN_PVR);
127
128         switch (PVR_VER(pvr)) {
129                 case PV_630:
130                 case PV_630p:
131                         model = &op_model_rs64;
132                         break;
133
134                 case PV_NORTHSTAR:
135                 case PV_PULSAR:
136                 case PV_ICESTAR:
137                 case PV_SSTAR:
138                         model = &op_model_rs64;
139                         break;
140
141                 case PV_POWER4:
142                 case PV_POWER4p:
143                         model = &op_model_power4;
144                         break;
145
146                 case PV_970:
147                 case PV_970FX:
148                 case PV_970MP:
149                         model = &op_model_power4;
150                         break;
151
152                 case PV_POWER5:
153                 case PV_POWER5p:
154                         model = &op_model_power4;
155                         break;
156
157                 default:
158                         return -ENODEV;
159         }
160
161         ops->cpu_type = cur_cpu_spec->oprofile_cpu_type;
162         model->num_counters = cur_cpu_spec->num_pmcs;
163         ops->create_files = op_ppc64_create_files;
164         ops->setup = op_ppc64_setup;
165         ops->shutdown = op_ppc64_shutdown;
166         ops->start = op_ppc64_start;
167         ops->stop = op_ppc64_stop;
168
169         printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
170                ops->cpu_type);
171
172         return 0;
173 }
174
175 void oprofile_arch_exit(void)
176 {
177 }