1 /*
2 * arch/powerpc/oprofile/op_model_7450.c
3 *
4 * Freescale 745x/744x oprofile support, based on fsl_booke support
5 * Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
6 *
7 * Copyright (c) 2004 Freescale Semiconductor, Inc
8 *
9 * Author: Andy Fleming
10 * Maintainer: Kumar Gala <galak@kernel.crashing.org>
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 */
17
18 #include <linux/oprofile.h>
19 #include <linux/smp.h>
20 #include <asm/ptrace.h>
21 #include <asm/processor.h>
22 #include <asm/cputable.h>
23 #include <asm/page.h>
24 #include <asm/pmc.h>
25 #include <asm/oprofile_impl.h>
26
27 static unsigned long reset_value[OP_MAX_COUNTER];
28
29 static int oprofile_running;
30 static u32 mmcr0_val, mmcr1_val, mmcr2_val, num_pmcs;
31
32 #define MMCR0_PMC1_SHIFT 6
33 #define MMCR0_PMC2_SHIFT 0
34 #define MMCR1_PMC3_SHIFT 27
35 #define MMCR1_PMC4_SHIFT 22
36 #define MMCR1_PMC5_SHIFT 17
37 #define MMCR1_PMC6_SHIFT 11
38
39 #define mmcr0_event1(event) \
40 ((event << MMCR0_PMC1_SHIFT) & MMCR0_PMC1SEL)
41 #define mmcr0_event2(event) \
42 ((event << MMCR0_PMC2_SHIFT) & MMCR0_PMC2SEL)
43
44 #define mmcr1_event3(event) \
45 ((event << MMCR1_PMC3_SHIFT) & MMCR1_PMC3SEL)
46 #define mmcr1_event4(event) \
47 ((event << MMCR1_PMC4_SHIFT) & MMCR1_PMC4SEL)
48 #define mmcr1_event5(event) \
49 ((event << MMCR1_PMC5_SHIFT) & MMCR1_PMC5SEL)
50 #define mmcr1_event6(event) \
51 ((event << MMCR1_PMC6_SHIFT) & MMCR1_PMC6SEL)
52
53 #define MMCR0_INIT (MMCR0_FC | MMCR0_FCS | MMCR0_FCP | MMCR0_FCM1 | MMCR0_FCM0)
54
55 /* Unfreezes the counters on this CPU, enables the interrupt,
56 * enables the counters to trigger the interrupt, and sets the
57 * counters to only count when the mark bit is not set.
58 */
pmc_start_ctrs(void)59 static void pmc_start_ctrs(void)
60 {
61 u32 mmcr0 = mfspr(SPRN_MMCR0);
62
63 mmcr0 &= ~(MMCR0_FC | MMCR0_FCM0);
64 mmcr0 |= (MMCR0_FCECE | MMCR0_PMC1CE | MMCR0_PMCnCE | MMCR0_PMXE);
65
66 mtspr(SPRN_MMCR0, mmcr0);
67 }
68
69 /* Disables the counters on this CPU, and freezes them */
pmc_stop_ctrs(void)70 static void pmc_stop_ctrs(void)
71 {
72 u32 mmcr0 = mfspr(SPRN_MMCR0);
73
74 mmcr0 |= MMCR0_FC;
75 mmcr0 &= ~(MMCR0_FCECE | MMCR0_PMC1CE | MMCR0_PMCnCE | MMCR0_PMXE);
76
77 mtspr(SPRN_MMCR0, mmcr0);
78 }
79
80 /* Configures the counters on this CPU based on the global
81 * settings */
fsl7450_cpu_setup(struct op_counter_config * ctr)82 static int fsl7450_cpu_setup(struct op_counter_config *ctr)
83 {
84 /* freeze all counters */
85 pmc_stop_ctrs();
86
87 mtspr(SPRN_MMCR0, mmcr0_val);
88 mtspr(SPRN_MMCR1, mmcr1_val);
89 if (num_pmcs > 4)
90 mtspr(SPRN_MMCR2, mmcr2_val);
91
92 return 0;
93 }
94
95 /* Configures the global settings for the countes on all CPUs. */
fsl7450_reg_setup(struct op_counter_config * ctr,struct op_system_config * sys,int num_ctrs)96 static int fsl7450_reg_setup(struct op_counter_config *ctr,
97 struct op_system_config *sys,
98 int num_ctrs)
99 {
100 int i;
101
102 num_pmcs = num_ctrs;
103 /* Our counters count up, and "count" refers to
104 * how much before the next interrupt, and we interrupt
105 * on overflow. So we calculate the starting value
106 * which will give us "count" until overflow.
107 * Then we set the events on the enabled counters */
108 for (i = 0; i < num_ctrs; ++i)
109 reset_value[i] = 0x80000000UL - ctr[i].count;
110
111 /* Set events for Counters 1 & 2 */
112 mmcr0_val = MMCR0_INIT | mmcr0_event1(ctr[0].event)
113 | mmcr0_event2(ctr[1].event);
114
115 /* Setup user/kernel bits */
116 if (sys->enable_kernel)
117 mmcr0_val &= ~(MMCR0_FCS);
118
119 if (sys->enable_user)
120 mmcr0_val &= ~(MMCR0_FCP);
121
122 /* Set events for Counters 3-6 */
123 mmcr1_val = mmcr1_event3(ctr[2].event)
124 | mmcr1_event4(ctr[3].event);
125 if (num_ctrs > 4)
126 mmcr1_val |= mmcr1_event5(ctr[4].event)
127 | mmcr1_event6(ctr[5].event);
128
129 mmcr2_val = 0;
130
131 return 0;
132 }
133
134 /* Sets the counters on this CPU to the chosen values, and starts them */
fsl7450_start(struct op_counter_config * ctr)135 static int fsl7450_start(struct op_counter_config *ctr)
136 {
137 int i;
138
139 mtmsr(mfmsr() | MSR_PMM);
140
141 for (i = 0; i < num_pmcs; ++i) {
142 if (ctr[i].enabled)
143 classic_ctr_write(i, reset_value[i]);
144 else
145 classic_ctr_write(i, 0);
146 }
147
148 /* Clear the freeze bit, and enable the interrupt.
149 * The counters won't actually start until the rfi clears
150 * the PMM bit */
151 pmc_start_ctrs();
152
153 oprofile_running = 1;
154
155 return 0;
156 }
157
158 /* Stop the counters on this CPU */
fsl7450_stop(void)159 static void fsl7450_stop(void)
160 {
161 /* freeze counters */
162 pmc_stop_ctrs();
163
164 oprofile_running = 0;
165
166 mb();
167 }
168
169
170 /* Handle the interrupt on this CPU, and log a sample for each
171 * event that triggered the interrupt */
fsl7450_handle_interrupt(struct pt_regs * regs,struct op_counter_config * ctr)172 static void fsl7450_handle_interrupt(struct pt_regs *regs,
173 struct op_counter_config *ctr)
174 {
175 unsigned long pc;
176 int is_kernel;
177 int val;
178 int i;
179
180 /* set the PMM bit (see comment below) */
181 mtmsr(mfmsr() | MSR_PMM);
182
183 pc = mfspr(SPRN_SIAR);
184 is_kernel = is_kernel_addr(pc);
185
186 for (i = 0; i < num_pmcs; ++i) {
187 val = classic_ctr_read(i);
188 if (val < 0) {
189 if (oprofile_running && ctr[i].enabled) {
190 oprofile_add_ext_sample(pc, regs, i, is_kernel);
191 classic_ctr_write(i, reset_value[i]);
192 } else {
193 classic_ctr_write(i, 0);
194 }
195 }
196 }
197
198 /* The freeze bit was set by the interrupt. */
199 /* Clear the freeze bit, and reenable the interrupt.
200 * The counters won't actually start until the rfi clears
201 * the PM/M bit */
202 pmc_start_ctrs();
203 }
204
205 struct op_powerpc_model op_model_7450= {
206 .reg_setup = fsl7450_reg_setup,
207 .cpu_setup = fsl7450_cpu_setup,
208 .start = fsl7450_start,
209 .stop = fsl7450_stop,
210 .handle_interrupt = fsl7450_handle_interrupt,
211 };
212