[POWERPC] Fix oprofile support on Cell LPAR
[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 void op_powerpc_cpu_setup(void *dummy)
38 {
39         model->cpu_setup(ctr);
40 }
41
42 static int op_powerpc_setup(void)
43 {
44         int err;
45
46         /* Grab the hardware */
47         err = reserve_pmc_hardware(op_handle_interrupt);
48         if (err)
49                 return err;
50
51         /* Pre-compute the values to stuff in the hardware registers.  */
52         model->reg_setup(ctr, &sys, model->num_counters);
53
54         /* Configure the registers on all cpus.  */
55         on_each_cpu(op_powerpc_cpu_setup, NULL, 0, 1);
56
57         return 0;
58 }
59
60 static void op_powerpc_shutdown(void)
61 {
62         release_pmc_hardware();
63 }
64
65 static void op_powerpc_cpu_start(void *dummy)
66 {
67         model->start(ctr);
68 }
69
70 static int op_powerpc_start(void)
71 {
72         if (model->global_start)
73                 model->global_start(ctr);
74         if (model->start)
75                 on_each_cpu(op_powerpc_cpu_start, NULL, 0, 1);
76         return 0;
77 }
78
79 static inline void op_powerpc_cpu_stop(void *dummy)
80 {
81         model->stop();
82 }
83
84 static void op_powerpc_stop(void)
85 {
86         if (model->stop)
87                 on_each_cpu(op_powerpc_cpu_stop, NULL, 0, 1);
88         if (model->global_stop)
89                 model->global_stop();
90 }
91
92 static int op_powerpc_create_files(struct super_block *sb, struct dentry *root)
93 {
94         int i;
95
96 #ifdef CONFIG_PPC64
97         /*
98          * There is one mmcr0, mmcr1 and mmcra for setting the events for
99          * all of the counters.
100          */
101         oprofilefs_create_ulong(sb, root, "mmcr0", &sys.mmcr0);
102         oprofilefs_create_ulong(sb, root, "mmcr1", &sys.mmcr1);
103         oprofilefs_create_ulong(sb, root, "mmcra", &sys.mmcra);
104 #endif
105
106         for (i = 0; i < model->num_counters; ++i) {
107                 struct dentry *dir;
108                 char buf[4];
109
110                 snprintf(buf, sizeof buf, "%d", i);
111                 dir = oprofilefs_mkdir(sb, root, buf);
112
113                 oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
114                 oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
115                 oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
116
117                 /*
118                  * Classic PowerPC doesn't support per-counter
119                  * control like this, but the options are
120                  * expected, so they remain.  For Freescale
121                  * Book-E style performance monitors, we do
122                  * support them.
123                  */
124                 oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
125                 oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
126
127                 oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
128         }
129
130         oprofilefs_create_ulong(sb, root, "enable_kernel", &sys.enable_kernel);
131         oprofilefs_create_ulong(sb, root, "enable_user", &sys.enable_user);
132
133         /* Default to tracing both kernel and user */
134         sys.enable_kernel = 1;
135         sys.enable_user = 1;
136
137         return 0;
138 }
139
140 int __init oprofile_arch_init(struct oprofile_operations *ops)
141 {
142         if (!cur_cpu_spec->oprofile_cpu_type)
143                 return -ENODEV;
144
145         if (firmware_has_feature(FW_FEATURE_ISERIES))
146                 return -ENODEV;
147
148         switch (cur_cpu_spec->oprofile_type) {
149 #ifdef CONFIG_PPC64
150 #ifdef CONFIG_PPC_CELL_NATIVE
151                 case PPC_OPROFILE_CELL:
152                         if (firmware_has_feature(FW_FEATURE_LPAR))
153                                 return -ENODEV;
154                         model = &op_model_cell;
155                         break;
156 #endif
157                 case PPC_OPROFILE_RS64:
158                         model = &op_model_rs64;
159                         break;
160                 case PPC_OPROFILE_POWER4:
161                         model = &op_model_power4;
162                         break;
163 #endif
164 #ifdef CONFIG_6xx
165                 case PPC_OPROFILE_G4:
166                         model = &op_model_7450;
167                         break;
168 #endif
169 #ifdef CONFIG_FSL_BOOKE
170                 case PPC_OPROFILE_BOOKE:
171                         model = &op_model_fsl_booke;
172                         break;
173 #endif
174                 default:
175                         return -ENODEV;
176         }
177
178         model->num_counters = cur_cpu_spec->num_pmcs;
179
180         ops->cpu_type = cur_cpu_spec->oprofile_cpu_type;
181         ops->create_files = op_powerpc_create_files;
182         ops->setup = op_powerpc_setup;
183         ops->shutdown = op_powerpc_shutdown;
184         ops->start = op_powerpc_start;
185         ops->stop = op_powerpc_stop;
186         ops->backtrace = op_powerpc_backtrace;
187
188         printk(KERN_DEBUG "oprofile: using %s performance monitoring.\n",
189                ops->cpu_type);
190
191         return 0;
192 }
193
194 void oprofile_arch_exit(void)
195 {
196 }