2 * Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
3 * Added mmcra[slot] support:
4 * Copyright (C) 2006-2007 Will Schmidt <willschm@us.ibm.com>, IBM
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.
12 #include <linux/oprofile.h>
13 #include <linux/init.h>
14 #include <linux/smp.h>
15 #include <asm/firmware.h>
16 #include <asm/ptrace.h>
17 #include <asm/system.h>
18 #include <asm/processor.h>
19 #include <asm/cputable.h>
21 #include <asm/oprofile_impl.h>
26 static unsigned long reset_value[OP_MAX_COUNTER];
28 static int oprofile_running;
30 /* mmcr values are set in power4_reg_setup, used in power4_cpu_setup */
35 static void power4_reg_setup(struct op_counter_config *ctr,
36 struct op_system_config *sys,
42 * The performance counter event settings are given in the mmcr0,
43 * mmcr1 and mmcra values passed from the user in the
44 * op_system_config structure (sys variable).
46 mmcr0_val = sys->mmcr0;
47 mmcr1_val = sys->mmcr1;
48 mmcra_val = sys->mmcra;
50 for (i = 0; i < cur_cpu_spec->num_pmcs; ++i)
51 reset_value[i] = 0x80000000UL - ctr[i].count;
53 /* setup user and kernel profiling */
54 if (sys->enable_kernel)
55 mmcr0_val &= ~MMCR0_KERNEL_DISABLE;
57 mmcr0_val |= MMCR0_KERNEL_DISABLE;
60 mmcr0_val &= ~MMCR0_PROBLEM_DISABLE;
62 mmcr0_val |= MMCR0_PROBLEM_DISABLE;
65 extern void ppc64_enable_pmcs(void);
68 * Older CPUs require the MMCRA sample bit to be always set, but newer
69 * CPUs only want it set for some groups. Eventually we will remove all
70 * knowledge of this bit in the kernel, oprofile userspace should be
71 * setting it when required.
73 * In order to keep current installations working we force the bit for
74 * those older CPUs. Once everyone has updated their oprofile userspace we
75 * can remove this hack.
77 static inline int mmcra_must_set_sample(void)
79 if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p) ||
80 __is_processor(PV_970) || __is_processor(PV_970FX) ||
81 __is_processor(PV_970MP) || __is_processor(PV_970GX))
87 static void power4_cpu_setup(struct op_counter_config *ctr)
89 unsigned int mmcr0 = mmcr0_val;
90 unsigned long mmcra = mmcra_val;
94 /* set the freeze bit */
96 mtspr(SPRN_MMCR0, mmcr0);
98 mmcr0 |= MMCR0_FCM1|MMCR0_PMXE|MMCR0_FCECE;
99 mmcr0 |= MMCR0_PMC1CE|MMCR0_PMCjCE;
100 mtspr(SPRN_MMCR0, mmcr0);
102 mtspr(SPRN_MMCR1, mmcr1_val);
104 if (mmcra_must_set_sample())
105 mmcra |= MMCRA_SAMPLE_ENABLE;
106 mtspr(SPRN_MMCRA, mmcra);
108 dbg("setup on cpu %d, mmcr0 %lx\n", smp_processor_id(),
110 dbg("setup on cpu %d, mmcr1 %lx\n", smp_processor_id(),
112 dbg("setup on cpu %d, mmcra %lx\n", smp_processor_id(),
116 static void power4_start(struct op_counter_config *ctr)
121 /* set the PMM bit (see comment below) */
122 mtmsrd(mfmsr() | MSR_PMM);
124 for (i = 0; i < cur_cpu_spec->num_pmcs; ++i) {
125 if (ctr[i].enabled) {
126 classic_ctr_write(i, reset_value[i]);
128 classic_ctr_write(i, 0);
132 mmcr0 = mfspr(SPRN_MMCR0);
135 * We must clear the PMAO bit on some (GQ) chips. Just do it
138 mmcr0 &= ~MMCR0_PMAO;
141 * now clear the freeze bit, counting will not start until we
142 * rfid from this excetion, because only at that point will
143 * the PMM bit be cleared
146 mtspr(SPRN_MMCR0, mmcr0);
148 oprofile_running = 1;
150 dbg("start on cpu %d, mmcr0 %x\n", smp_processor_id(), mmcr0);
153 static void power4_stop(void)
157 /* freeze counters */
158 mmcr0 = mfspr(SPRN_MMCR0);
160 mtspr(SPRN_MMCR0, mmcr0);
162 oprofile_running = 0;
164 dbg("stop on cpu %d, mmcr0 %x\n", smp_processor_id(), mmcr0);
169 /* Fake functions used by canonicalize_pc */
170 static void __attribute_used__ hypervisor_bucket(void)
174 static void __attribute_used__ rtas_bucket(void)
178 static void __attribute_used__ kernel_unknown_bucket(void)
183 * On GQ and newer the MMCRA stores the HV and PR bits at the time
184 * the SIAR was sampled. We use that to work out if the SIAR was sampled in
185 * the hypervisor, our exception vectors or RTAS.
186 * If the MMCRA_SAMPLE_ENABLE bit is set, we can use the MMCRA[slot] bits
187 * to more accurately identify the address of the sampled instruction. The
188 * mmcra[slot] bits represent the slot number of a sampled instruction
189 * within an instruction group. The slot will contain a value between 1
190 * and 5 if MMCRA_SAMPLE_ENABLE is set, otherwise 0.
192 static unsigned long get_pc(struct pt_regs *regs)
194 unsigned long pc = mfspr(SPRN_SIAR);
198 /* Cant do much about it */
199 if (!cur_cpu_spec->oprofile_mmcra_sihv)
202 mmcra = mfspr(SPRN_MMCRA);
204 if (mmcra & MMCRA_SAMPLE_ENABLE) {
205 slot = ((mmcra & MMCRA_SLOT) >> MMCRA_SLOT_SHIFT);
207 pc += 4 * (slot - 1);
210 /* Were we in the hypervisor? */
211 if (firmware_has_feature(FW_FEATURE_LPAR) &&
212 (mmcra & cur_cpu_spec->oprofile_mmcra_sihv))
213 /* function descriptor madness */
214 return *((unsigned long *)hypervisor_bucket);
216 /* We were in userspace, nothing to do */
217 if (mmcra & cur_cpu_spec->oprofile_mmcra_sipr)
220 #ifdef CONFIG_PPC_RTAS
221 /* Were we in RTAS? */
222 if (pc >= rtas.base && pc < (rtas.base + rtas.size))
223 /* function descriptor madness */
224 return *((unsigned long *)rtas_bucket);
227 /* Were we in our exception vectors or SLB real mode miss handler? */
228 if (pc < 0x1000000UL)
229 return (unsigned long)__va(pc);
231 /* Not sure where we were */
232 if (!is_kernel_addr(pc))
233 /* function descriptor madness */
234 return *((unsigned long *)kernel_unknown_bucket);
239 static int get_kernel(unsigned long pc, unsigned long mmcra)
243 if (!cur_cpu_spec->oprofile_mmcra_sihv) {
244 is_kernel = is_kernel_addr(pc);
246 is_kernel = ((mmcra & cur_cpu_spec->oprofile_mmcra_sipr) == 0);
252 static void power4_handle_interrupt(struct pt_regs *regs,
253 struct op_counter_config *ctr)
262 mmcra = mfspr(SPRN_MMCRA);
265 is_kernel = get_kernel(pc, mmcra);
267 /* set the PMM bit (see comment below) */
268 mtmsrd(mfmsr() | MSR_PMM);
270 for (i = 0; i < cur_cpu_spec->num_pmcs; ++i) {
271 val = classic_ctr_read(i);
273 if (oprofile_running && ctr[i].enabled) {
274 oprofile_add_ext_sample(pc, regs, i, is_kernel);
275 classic_ctr_write(i, reset_value[i]);
277 classic_ctr_write(i, 0);
282 mmcr0 = mfspr(SPRN_MMCR0);
284 /* reset the perfmon trigger */
288 * We must clear the PMAO bit on some (GQ) chips. Just do it
291 mmcr0 &= ~MMCR0_PMAO;
293 /* Clear the appropriate bits in the MMCRA */
294 mmcra &= ~cur_cpu_spec->oprofile_mmcra_clear;
295 mtspr(SPRN_MMCRA, mmcra);
298 * now clear the freeze bit, counting will not start until we
299 * rfid from this exception, because only at that point will
300 * the PMM bit be cleared
303 mtspr(SPRN_MMCR0, mmcr0);
306 struct op_powerpc_model op_model_power4 = {
307 .reg_setup = power4_reg_setup,
308 .cpu_setup = power4_cpu_setup,
309 .start = power4_start,
311 .handle_interrupt = power4_handle_interrupt,