/arch/powerpc/oprofile/op_model_7450.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * arch/powerpc/oprofile/op_model_7450.c
  4 *
  5 * Freescale 745x/744x oprofile support, based on fsl_booke support
  6 * Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
  7 *
  8 * Copyright (c) 2004 Freescale Semiconductor, Inc
  9 *
 10 * Author: Andy Fleming
 11 * Maintainer: Kumar Gala <galak@kernel.crashing.org>
 12 */
 13
 14#include <linux/oprofile.h>
 15#include <linux/smp.h>
 16#include <asm/ptrace.h>
 17#include <asm/processor.h>
 18#include <asm/cputable.h>
 19#include <asm/page.h>
 20#include <asm/pmc.h>
 21#include <asm/oprofile_impl.h>
 22
 23static unsigned long reset_value[OP_MAX_COUNTER];
 24
 25static int oprofile_running;
 26static u32 mmcr0_val, mmcr1_val, mmcr2_val, num_pmcs;
 27
 28#define MMCR0_PMC1_SHIFT	6
 29#define MMCR0_PMC2_SHIFT	0
 30#define MMCR1_PMC3_SHIFT	27
 31#define MMCR1_PMC4_SHIFT	22
 32#define MMCR1_PMC5_SHIFT	17
 33#define MMCR1_PMC6_SHIFT	11
 34
 35#define mmcr0_event1(event) \
 36	((event << MMCR0_PMC1_SHIFT) & MMCR0_PMC1SEL)
 37#define mmcr0_event2(event) \
 38	((event << MMCR0_PMC2_SHIFT) & MMCR0_PMC2SEL)
 39
 40#define mmcr1_event3(event) \
 41	((event << MMCR1_PMC3_SHIFT) & MMCR1_PMC3SEL)
 42#define mmcr1_event4(event) \
 43	((event << MMCR1_PMC4_SHIFT) & MMCR1_PMC4SEL)
 44#define mmcr1_event5(event) \
 45	((event << MMCR1_PMC5_SHIFT) & MMCR1_PMC5SEL)
 46#define mmcr1_event6(event) \
 47	((event << MMCR1_PMC6_SHIFT) & MMCR1_PMC6SEL)
 48
 49#define MMCR0_INIT (MMCR0_FC | MMCR0_FCS | MMCR0_FCP | MMCR0_FCM1 | MMCR0_FCM0)
 50
 51/* Unfreezes the counters on this CPU, enables the interrupt,
 52 * enables the counters to trigger the interrupt, and sets the
 53 * counters to only count when the mark bit is not set.
 54 */
 55static void pmc_start_ctrs(void)
 56{
 57	u32 mmcr0 = mfspr(SPRN_MMCR0);
 58
 59	mmcr0 &= ~(MMCR0_FC | MMCR0_FCM0);
 60	mmcr0 |= (MMCR0_FCECE | MMCR0_PMC1CE | MMCR0_PMCnCE | MMCR0_PMXE);
 61
 62	mtspr(SPRN_MMCR0, mmcr0);
 63}
 64
 65/* Disables the counters on this CPU, and freezes them */
 66static void pmc_stop_ctrs(void)
 67{
 68	u32 mmcr0 = mfspr(SPRN_MMCR0);
 69
 70	mmcr0 |= MMCR0_FC;
 71	mmcr0 &= ~(MMCR0_FCECE | MMCR0_PMC1CE | MMCR0_PMCnCE | MMCR0_PMXE);
 72
 73	mtspr(SPRN_MMCR0, mmcr0);
 74}
 75
 76/* Configures the counters on this CPU based on the global
 77 * settings */
 78static int fsl7450_cpu_setup(struct op_counter_config *ctr)
 79{
 80	/* freeze all counters */
 81	pmc_stop_ctrs();
 82
 83	mtspr(SPRN_MMCR0, mmcr0_val);
 84	mtspr(SPRN_MMCR1, mmcr1_val);
 85	if (num_pmcs > 4)
 86		mtspr(SPRN_MMCR2, mmcr2_val);
 87
 88	return 0;
 89}
 90
 91/* Configures the global settings for the countes on all CPUs. */
 92static int fsl7450_reg_setup(struct op_counter_config *ctr,
 93			     struct op_system_config *sys,
 94			     int num_ctrs)
 95{
 96	int i;
 97
 98	num_pmcs = num_ctrs;
 99	/* Our counters count up, and "count" refers to
100	 * how much before the next interrupt, and we interrupt
101	 * on overflow.  So we calculate the starting value
102	 * which will give us "count" until overflow.
103	 * Then we set the events on the enabled counters */
104	for (i = 0; i < num_ctrs; ++i)
105		reset_value[i] = 0x80000000UL - ctr[i].count;
106
107	/* Set events for Counters 1 & 2 */
108	mmcr0_val = MMCR0_INIT | mmcr0_event1(ctr[0].event)
109		| mmcr0_event2(ctr[1].event);
110
111	/* Setup user/kernel bits */
112	if (sys->enable_kernel)
113		mmcr0_val &= ~(MMCR0_FCS);
114
115	if (sys->enable_user)
116		mmcr0_val &= ~(MMCR0_FCP);
117
118	/* Set events for Counters 3-6 */
119	mmcr1_val = mmcr1_event3(ctr[2].event)
120		| mmcr1_event4(ctr[3].event);
121	if (num_ctrs > 4)
122		mmcr1_val |= mmcr1_event5(ctr[4].event)
123			| mmcr1_event6(ctr[5].event);
124
125	mmcr2_val = 0;
126
127	return 0;
128}
129
130/* Sets the counters on this CPU to the chosen values, and starts them */
131static int fsl7450_start(struct op_counter_config *ctr)
132{
133	int i;
134
135	mtmsr(mfmsr() | MSR_PMM);
136
137	for (i = 0; i < num_pmcs; ++i) {
138		if (ctr[i].enabled)
139			classic_ctr_write(i, reset_value[i]);
140		else
141			classic_ctr_write(i, 0);
142	}
143
144	/* Clear the freeze bit, and enable the interrupt.
145	 * The counters won't actually start until the rfi clears
146	 * the PMM bit */
147	pmc_start_ctrs();
148
149	oprofile_running = 1;
150
151	return 0;
152}
153
154/* Stop the counters on this CPU */
155static void fsl7450_stop(void)
156{
157	/* freeze counters */
158	pmc_stop_ctrs();
159
160	oprofile_running = 0;
161
162	mb();
163}
164
165
166/* Handle the interrupt on this CPU, and log a sample for each
167 * event that triggered the interrupt */
168static void fsl7450_handle_interrupt(struct pt_regs *regs,
169				    struct op_counter_config *ctr)
170{
171	unsigned long pc;
172	int is_kernel;
173	int val;
174	int i;
175
176	/* set the PMM bit (see comment below) */
177	mtmsr(mfmsr() | MSR_PMM);
178
179	pc = mfspr(SPRN_SIAR);
180	is_kernel = is_kernel_addr(pc);
181
182	for (i = 0; i < num_pmcs; ++i) {
183		val = classic_ctr_read(i);
184		if (val < 0) {
185			if (oprofile_running && ctr[i].enabled) {
186				oprofile_add_ext_sample(pc, regs, i, is_kernel);
187				classic_ctr_write(i, reset_value[i]);
188			} else {
189				classic_ctr_write(i, 0);
190			}
191		}
192	}
193
194	/* The freeze bit was set by the interrupt. */
195	/* Clear the freeze bit, and reenable the interrupt.
196	 * The counters won't actually start until the rfi clears
197	 * the PM/M bit */
198	pmc_start_ctrs();
199}
200
201struct op_powerpc_model op_model_7450= {
202	.reg_setup		= fsl7450_reg_setup,
203	.cpu_setup		= fsl7450_cpu_setup,
204	.start			= fsl7450_start,
205	.stop			= fsl7450_stop,
206	.handle_interrupt	= fsl7450_handle_interrupt,
207};