2 * Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
10 #include <linux/oprofile.h>
11 #include <linux/init.h>
12 #include <linux/smp.h>
13 #include <asm/ptrace.h>
14 #include <asm/system.h>
15 #include <asm/processor.h>
16 #include <asm/cputable.h>
17 #include <asm/oprofile_impl.h>
21 static void ctrl_write(unsigned int i, unsigned int val)
24 unsigned long shift = 0, mask = 0;
26 dbg("ctrl_write %d %x\n", i, val);
30 tmp = mfspr(SPRN_MMCR0);
35 tmp = mfspr(SPRN_MMCR0);
40 tmp = mfspr(SPRN_MMCR1);
45 tmp = mfspr(SPRN_MMCR1);
50 tmp = mfspr(SPRN_MMCR1);
55 tmp = mfspr(SPRN_MMCR1);
60 tmp = mfspr(SPRN_MMCR1);
65 tmp = mfspr(SPRN_MMCR1);
71 tmp = tmp & ~(mask << shift);
77 mtspr(SPRN_MMCR0, tmp);
80 mtspr(SPRN_MMCR1, tmp);
83 dbg("ctrl_write mmcr0 %lx mmcr1 %lx\n", mfspr(SPRN_MMCR0),
87 static unsigned long reset_value[OP_MAX_COUNTER];
89 static int num_counters;
91 static int rs64_reg_setup(struct op_counter_config *ctr,
92 struct op_system_config *sys,
97 num_counters = num_ctrs;
99 for (i = 0; i < num_counters; ++i)
100 reset_value[i] = 0x80000000UL - ctr[i].count;
102 /* XXX setup user and kernel profiling */
106 static int rs64_cpu_setup(struct op_counter_config *ctr)
110 /* reset MMCR0 and set the freeze bit */
112 mtspr(SPRN_MMCR0, mmcr0);
114 /* reset MMCR1, MMCRA */
115 mtspr(SPRN_MMCR1, 0);
117 if (cpu_has_feature(CPU_FTR_MMCRA))
118 mtspr(SPRN_MMCRA, 0);
120 mmcr0 |= MMCR0_FCM1|MMCR0_PMXE|MMCR0_FCECE;
121 /* Only applies to POWER3, but should be safe on RS64 */
122 mmcr0 |= MMCR0_PMC1CE|MMCR0_PMCjCE;
123 mtspr(SPRN_MMCR0, mmcr0);
125 dbg("setup on cpu %d, mmcr0 %lx\n", smp_processor_id(),
127 dbg("setup on cpu %d, mmcr1 %lx\n", smp_processor_id(),
133 static int rs64_start(struct op_counter_config *ctr)
138 /* set the PMM bit (see comment below) */
139 mtmsrd(mfmsr() | MSR_PMM);
141 for (i = 0; i < num_counters; ++i) {
142 if (ctr[i].enabled) {
143 classic_ctr_write(i, reset_value[i]);
144 ctrl_write(i, ctr[i].event);
146 classic_ctr_write(i, 0);
150 mmcr0 = mfspr(SPRN_MMCR0);
153 * now clear the freeze bit, counting will not start until we
154 * rfid from this excetion, because only at that point will
155 * the PMM bit be cleared
158 mtspr(SPRN_MMCR0, mmcr0);
160 dbg("start on cpu %d, mmcr0 %x\n", smp_processor_id(), mmcr0);
164 static void rs64_stop(void)
168 /* freeze counters */
169 mmcr0 = mfspr(SPRN_MMCR0);
171 mtspr(SPRN_MMCR0, mmcr0);
173 dbg("stop on cpu %d, mmcr0 %x\n", smp_processor_id(), mmcr0);
178 static void rs64_handle_interrupt(struct pt_regs *regs,
179 struct op_counter_config *ctr)
185 unsigned long pc = mfspr(SPRN_SIAR);
187 is_kernel = is_kernel_addr(pc);
189 /* set the PMM bit (see comment below) */
190 mtmsrd(mfmsr() | MSR_PMM);
192 for (i = 0; i < num_counters; ++i) {
193 val = classic_ctr_read(i);
195 if (ctr[i].enabled) {
196 oprofile_add_ext_sample(pc, regs, i, is_kernel);
197 classic_ctr_write(i, reset_value[i]);
199 classic_ctr_write(i, 0);
204 mmcr0 = mfspr(SPRN_MMCR0);
206 /* reset the perfmon trigger */
210 * now clear the freeze bit, counting will not start until we
211 * rfid from this exception, because only at that point will
212 * the PMM bit be cleared
215 mtspr(SPRN_MMCR0, mmcr0);
218 struct op_powerpc_model op_model_rs64 = {
219 .reg_setup = rs64_reg_setup,
220 .cpu_setup = rs64_cpu_setup,
223 .handle_interrupt = rs64_handle_interrupt,