Linux-2.6.12-rc2
[linux-3.10.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
20 #include "op_impl.h"
21
22 extern struct op_ppc64_model op_model_rs64;
23 extern struct op_ppc64_model op_model_power4;
24 static struct op_ppc64_model *model;
25
26 static struct op_counter_config ctr[OP_MAX_COUNTER];
27 static struct op_system_config sys;
28
29 static void op_handle_interrupt(struct pt_regs *regs)
30 {
31         model->handle_interrupt(regs, ctr);
32 }
33
34 static int op_ppc64_setup(void)
35 {
36         int err;
37
38         /* Grab the hardware */
39         err = reserve_pmc_hardware(op_handle_interrupt);
40         if (err)
41                 return err;
42
43         /* Pre-compute the values to stuff in the hardware registers.  */
44         model->reg_setup(ctr, &sys, model->num_counters);
45
46         /* Configure the registers on all cpus.  */
47         on_each_cpu(model->cpu_setup, NULL, 0, 1);
48
49         return 0;
50 }
51
52 static void op_ppc64_shutdown(void)
53 {
54         release_pmc_hardware();
55 }
56
57 static void op_ppc64_cpu_start(void *dummy)
58 {
59         model->start(ctr);
60 }
61
62 static int op_ppc64_start(void)
63 {
64         on_each_cpu(op_ppc64_cpu_start, NULL, 0, 1);
65         return 0;
66 }
67
68 static inline void op_ppc64_cpu_stop(void *dummy)
69 {
70         model->stop();
71 }
72
73 static void op_ppc64_stop(void)
74 {
75         on_each_cpu(op_ppc64_cpu_stop, NULL, 0, 1);
76 }
77
78 static int op_ppc64_create_files(struct super_block *sb, struct dentry *root)
79 {
80         int i;
81
82         /*
83          * There is one mmcr0, mmcr1 and mmcra for setting the events for
84          * all of the counters.
85          */
86         oprofilefs_create_ulong(sb, root, "mmcr0", &sys.mmcr0);
87         oprofilefs_create_ulong(sb, root, "mmcr1", &sys.mmcr1);
88         oprofilefs_create_ulong(sb, root, "mmcra", &sys.mmcra);
89
90         for (i = 0; i < model->num_counters; ++i) {
91                 struct dentry *dir;
92                 char buf[3];
93
94                 snprintf(buf, sizeof buf, "%d", i);
95                 dir = oprofilefs_mkdir(sb, root, buf);
96
97                 oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
98                 oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
99                 oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
100                 /*
101                  * We dont support per counter user/kernel selection, but
102                  * we leave the entries because userspace expects them
103                  */
104                 oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
105                 oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
106                 oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
107         }
108
109         oprofilefs_create_ulong(sb, root, "enable_kernel", &sys.enable_kernel);
110         oprofilefs_create_ulong(sb, root, "enable_user", &sys.enable_user);
111         oprofilefs_create_ulong(sb, root, "backtrace_spinlocks",
112                                 &sys.backtrace_spinlocks);
113
114         /* Default to tracing both kernel and user */
115         sys.enable_kernel = 1;
116         sys.enable_user = 1;
117
118         /* Turn on backtracing through spinlocks by default */
119         sys.backtrace_spinlocks = 1;
120
121         return 0;
122 }
123
124 int __init oprofile_arch_init(struct oprofile_operations *ops)
125 {
126         unsigned int pvr;
127
128         pvr = mfspr(SPRN_PVR);
129
130         switch (PVR_VER(pvr)) {
131                 case PV_630:
132                 case PV_630p:
133                         model = &op_model_rs64;
134                         model->num_counters = 8;
135                         ops->cpu_type = "ppc64/power3";
136                         break;
137
138                 case PV_NORTHSTAR:
139                 case PV_PULSAR:
140                 case PV_ICESTAR:
141                 case PV_SSTAR:
142                         model = &op_model_rs64;
143                         model->num_counters = 8;
144                         ops->cpu_type = "ppc64/rs64";
145                         break;
146
147                 case PV_POWER4:
148                 case PV_POWER4p:
149                         model = &op_model_power4;
150                         model->num_counters = 8;
151                         ops->cpu_type = "ppc64/power4";
152                         break;
153
154                 case PV_970:
155                 case PV_970FX:
156                         model = &op_model_power4;
157                         model->num_counters = 8;
158                         ops->cpu_type = "ppc64/970";
159                         break;
160
161                 case PV_POWER5:
162                 case PV_POWER5p:
163                         model = &op_model_power4;
164                         model->num_counters = 6;
165                         ops->cpu_type = "ppc64/power5";
166                         break;
167
168                 default:
169                         return -ENODEV;
170         }
171
172         ops->create_files = op_ppc64_create_files;
173         ops->setup = op_ppc64_setup;
174         ops->shutdown = op_ppc64_shutdown;
175         ops->start = op_ppc64_start;
176         ops->stop = op_ppc64_stop;
177
178         printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
179                ops->cpu_type);
180
181         return 0;
182 }
183
184 void oprofile_arch_exit(void)
185 {
186 }