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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_PPC_BOOK3S_64
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 }