sh: romImage support V2
[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 int op_per_cpu_rc;
33
34 static void op_handle_interrupt(struct pt_regs *regs)
35 {
36         model->handle_interrupt(regs, ctr);
37 }
38
39 static void op_powerpc_cpu_setup(void *dummy)
40 {
41         int ret;
42
43         ret = model->cpu_setup(ctr);
44
45         if (ret != 0)
46                 op_per_cpu_rc = ret;
47 }
48
49 static int op_powerpc_setup(void)
50 {
51         int err;
52
53         op_per_cpu_rc = 0;
54
55         /* Grab the hardware */
56         err = reserve_pmc_hardware(op_handle_interrupt);
57         if (err)
58                 return err;
59
60         /* Pre-compute the values to stuff in the hardware registers.  */
61         op_per_cpu_rc = model->reg_setup(ctr, &sys, model->num_counters);
62
63         if (op_per_cpu_rc)
64                 goto out;
65
66         /* Configure the registers on all cpus.  If an error occurs on one
67          * of the cpus, op_per_cpu_rc will be set to the error */
68         on_each_cpu(op_powerpc_cpu_setup, NULL, 1);
69
70 out:    if (op_per_cpu_rc) {
71                 /* error on setup release the performance counter hardware */
72                 release_pmc_hardware();
73         }
74
75         return op_per_cpu_rc;
76 }
77
78 static void op_powerpc_shutdown(void)
79 {
80         release_pmc_hardware();
81 }
82
83 static void op_powerpc_cpu_start(void *dummy)
84 {
85         /* If any of the cpus have return an error, set the
86          * global flag to the error so it can be returned
87          * to the generic OProfile caller.
88          */
89         int ret;
90
91         ret = model->start(ctr);
92         if (ret != 0)
93                 op_per_cpu_rc = ret;
94 }
95
96 static int op_powerpc_start(void)
97 {
98         op_per_cpu_rc = 0;
99
100         if (model->global_start)
101                 return model->global_start(ctr);
102         if (model->start) {
103                 on_each_cpu(op_powerpc_cpu_start, NULL, 1);
104                 return op_per_cpu_rc;
105         }
106         return -EIO; /* No start function is defined for this
107                         power architecture */
108 }
109
110 static inline void op_powerpc_cpu_stop(void *dummy)
111 {
112         model->stop();
113 }
114
115 static void op_powerpc_stop(void)
116 {
117         if (model->stop)
118                 on_each_cpu(op_powerpc_cpu_stop, NULL, 1);
119         if (model->global_stop)
120                 model->global_stop();
121 }
122
123 static int op_powerpc_create_files(struct super_block *sb, struct dentry *root)
124 {
125         int i;
126
127 #ifdef CONFIG_PPC64
128         /*
129          * There is one mmcr0, mmcr1 and mmcra for setting the events for
130          * all of the counters.
131          */
132         oprofilefs_create_ulong(sb, root, "mmcr0", &sys.mmcr0);
133         oprofilefs_create_ulong(sb, root, "mmcr1", &sys.mmcr1);
134         oprofilefs_create_ulong(sb, root, "mmcra", &sys.mmcra);
135 #ifdef CONFIG_OPROFILE_CELL
136         /* create a file the user tool can check to see what level of profiling
137          * support exits with this kernel. Initialize bit mask to indicate
138          * what support the kernel has:
139          * bit 0      -  Supports SPU event profiling in addition to PPU
140          *               event and cycles; and SPU cycle profiling
141          * bits 1-31  -  Currently unused.
142          *
143          * If the file does not exist, then the kernel only supports SPU
144          * cycle profiling, PPU event and cycle profiling.
145          */
146         oprofilefs_create_ulong(sb, root, "cell_support", &sys.cell_support);
147         sys.cell_support = 0x1; /* Note, the user OProfile tool must check
148                                  * that this bit is set before attempting to
149                                  * user SPU event profiling.  Older kernels
150                                  * will not have this file, hence the user
151                                  * tool is not allowed to do SPU event
152                                  * profiling on older kernels.  Older kernels
153                                  * will accept SPU events but collected data
154                                  * is garbage.
155                                  */
156 #endif
157 #endif
158
159         for (i = 0; i < model->num_counters; ++i) {
160                 struct dentry *dir;
161                 char buf[4];
162
163                 snprintf(buf, sizeof buf, "%d", i);
164                 dir = oprofilefs_mkdir(sb, root, buf);
165
166                 oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
167                 oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
168                 oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
169
170                 /*
171                  * Classic PowerPC doesn't support per-counter
172                  * control like this, but the options are
173                  * expected, so they remain.  For Freescale
174                  * Book-E style performance monitors, we do
175                  * support them.
176                  */
177                 oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
178                 oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
179
180                 oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
181         }
182
183         oprofilefs_create_ulong(sb, root, "enable_kernel", &sys.enable_kernel);
184         oprofilefs_create_ulong(sb, root, "enable_user", &sys.enable_user);
185
186         /* Default to tracing both kernel and user */
187         sys.enable_kernel = 1;
188         sys.enable_user = 1;
189
190         return 0;
191 }
192
193 int __init oprofile_arch_init(struct oprofile_operations *ops)
194 {
195         if (!cur_cpu_spec->oprofile_cpu_type)
196                 return -ENODEV;
197
198         if (firmware_has_feature(FW_FEATURE_ISERIES))
199                 return -ENODEV;
200
201         switch (cur_cpu_spec->oprofile_type) {
202 #ifdef CONFIG_PPC64
203 #ifdef CONFIG_OPROFILE_CELL
204                 case PPC_OPROFILE_CELL:
205                         if (firmware_has_feature(FW_FEATURE_LPAR))
206                                 return -ENODEV;
207                         model = &op_model_cell;
208                         ops->sync_start = model->sync_start;
209                         ops->sync_stop = model->sync_stop;
210                         break;
211 #endif
212                 case PPC_OPROFILE_RS64:
213                         model = &op_model_rs64;
214                         break;
215                 case PPC_OPROFILE_POWER4:
216                         model = &op_model_power4;
217                         break;
218                 case PPC_OPROFILE_PA6T:
219                         model = &op_model_pa6t;
220                         break;
221 #endif
222 #ifdef CONFIG_6xx
223                 case PPC_OPROFILE_G4:
224                         model = &op_model_7450;
225                         break;
226 #endif
227 #if defined(CONFIG_FSL_EMB_PERFMON)
228                 case PPC_OPROFILE_FSL_EMB:
229                         model = &op_model_fsl_emb;
230                         break;
231 #endif
232                 default:
233                         return -ENODEV;
234         }
235
236         model->num_counters = cur_cpu_spec->num_pmcs;
237
238         ops->cpu_type = cur_cpu_spec->oprofile_cpu_type;
239         ops->create_files = op_powerpc_create_files;
240         ops->setup = op_powerpc_setup;
241         ops->shutdown = op_powerpc_shutdown;
242         ops->start = op_powerpc_start;
243         ops->stop = op_powerpc_stop;
244         ops->backtrace = op_powerpc_backtrace;
245
246         printk(KERN_DEBUG "oprofile: using %s performance monitoring.\n",
247                ops->cpu_type);
248
249         return 0;
250 }
251
252 void oprofile_arch_exit(void)
253 {
254 }