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/pmc.h>
 22#include <asm/cputable.h>
 23#include <asm/oprofile_impl.h>
 24#include <asm/firmware.h>
 25
 26static struct op_powerpc_model *model;
 27
 28static struct op_counter_config ctr[OP_MAX_COUNTER];
 29static struct op_system_config sys;
 30
 31static int op_per_cpu_rc;
 32
 33static void op_handle_interrupt(struct pt_regs *regs)
 34{
 35	model->handle_interrupt(regs, ctr);
 36}
 37
 38static void op_powerpc_cpu_setup(void *dummy)
 39{
 40	int ret;
 41
 42	ret = model->cpu_setup(ctr);
 43
 44	if (ret != 0)
 45		op_per_cpu_rc = ret;
 46}
 47
 48static int op_powerpc_setup(void)
 49{
 50	int err;
 51
 52	op_per_cpu_rc = 0;
 53
 54	/* Grab the hardware */
 55	err = reserve_pmc_hardware(op_handle_interrupt);
 56	if (err)
 57		return err;
 58
 59	/* Pre-compute the values to stuff in the hardware registers.  */
 60	op_per_cpu_rc = model->reg_setup(ctr, &sys, model->num_counters);
 61
 62	if (op_per_cpu_rc)
 63		goto out;
 64
 65	/* Configure the registers on all cpus.	 If an error occurs on one
 66	 * of the cpus, op_per_cpu_rc will be set to the error */
 67	on_each_cpu(op_powerpc_cpu_setup, NULL, 1);
 68
 69out:	if (op_per_cpu_rc) {
 70		/* error on setup release the performance counter hardware */
 71		release_pmc_hardware();
 72	}
 73
 74	return op_per_cpu_rc;
 75}
 76
 77static void op_powerpc_shutdown(void)
 78{
 79	release_pmc_hardware();
 80}
 81
 82static void op_powerpc_cpu_start(void *dummy)
 83{
 84	/* If any of the cpus have return an error, set the
 85	 * global flag to the error so it can be returned
 86	 * to the generic OProfile caller.
 87	 */
 88	int ret;
 89
 90	ret = model->start(ctr);
 91	if (ret != 0)
 92		op_per_cpu_rc = ret;
 93}
 94
 95static int op_powerpc_start(void)
 96{
 97	op_per_cpu_rc = 0;
 98
 99	if (model->global_start)
100		return model->global_start(ctr);
101	if (model->start) {
102		on_each_cpu(op_powerpc_cpu_start, NULL, 1);
103		return op_per_cpu_rc;
104	}
105	return -EIO; /* No start function is defined for this
106			power architecture */
107}
108
109static inline void op_powerpc_cpu_stop(void *dummy)
110{
111	model->stop();
112}
113
114static void op_powerpc_stop(void)
115{
116	if (model->stop)
117		on_each_cpu(op_powerpc_cpu_stop, NULL, 1);
118        if (model->global_stop)
119                model->global_stop();
120}
121
122static int op_powerpc_create_files(struct dentry *root)
123{
124	int i;
125
126#ifdef CONFIG_PPC64
127	/*
128	 * There is one mmcr0, mmcr1 and mmcra for setting the events for
129	 * all of the counters.
130	 */
131	oprofilefs_create_ulong(root, "mmcr0", &sys.mmcr0);
132	oprofilefs_create_ulong(root, "mmcr1", &sys.mmcr1);
133	oprofilefs_create_ulong(root, "mmcra", &sys.mmcra);
134#ifdef CONFIG_OPROFILE_CELL
135	/* create a file the user tool can check to see what level of profiling
136	 * support exits with this kernel. Initialize bit mask to indicate
137	 * what support the kernel has:
138	 * bit 0      -  Supports SPU event profiling in addition to PPU
139	 *               event and cycles; and SPU cycle profiling
140	 * bits 1-31  -  Currently unused.
141	 *
142	 * If the file does not exist, then the kernel only supports SPU
143	 * cycle profiling, PPU event and cycle profiling.
144	 */
145	oprofilefs_create_ulong(root, "cell_support", &sys.cell_support);
146	sys.cell_support = 0x1; /* Note, the user OProfile tool must check
147				 * that this bit is set before attempting to
148				 * user SPU event profiling.  Older kernels
149				 * will not have this file, hence the user
150				 * tool is not allowed to do SPU event
151				 * profiling on older kernels.  Older kernels
152				 * will accept SPU events but collected data
153				 * is garbage.
154				 */
155#endif
156#endif
157
158	for (i = 0; i < model->num_counters; ++i) {
159		struct dentry *dir;
160		char buf[4];
161
162		snprintf(buf, sizeof buf, "%d", i);
163		dir = oprofilefs_mkdir(root, buf);
164
165		oprofilefs_create_ulong(dir, "enabled", &ctr[i].enabled);
166		oprofilefs_create_ulong(dir, "event", &ctr[i].event);
167		oprofilefs_create_ulong(dir, "count", &ctr[i].count);
168
169		/*
170		 * Classic PowerPC doesn't support per-counter
171		 * control like this, but the options are
172		 * expected, so they remain.  For Freescale
173		 * Book-E style performance monitors, we do
174		 * support them.
175		 */
176		oprofilefs_create_ulong(dir, "kernel", &ctr[i].kernel);
177		oprofilefs_create_ulong(dir, "user", &ctr[i].user);
178
179		oprofilefs_create_ulong(dir, "unit_mask", &ctr[i].unit_mask);
180	}
181
182	oprofilefs_create_ulong(root, "enable_kernel", &sys.enable_kernel);
183	oprofilefs_create_ulong(root, "enable_user", &sys.enable_user);
184
185	/* Default to tracing both kernel and user */
186	sys.enable_kernel = 1;
187	sys.enable_user = 1;
188
189	return 0;
190}
191
192int __init oprofile_arch_init(struct oprofile_operations *ops)
193{
194	if (!cur_cpu_spec->oprofile_cpu_type)
195		return -ENODEV;
196
197	switch (cur_cpu_spec->oprofile_type) {
198#ifdef CONFIG_PPC_BOOK3S_64
199#ifdef CONFIG_OPROFILE_CELL
200		case PPC_OPROFILE_CELL:
201			if (firmware_has_feature(FW_FEATURE_LPAR))
202				return -ENODEV;
203			model = &op_model_cell;
204			ops->sync_start = model->sync_start;
205			ops->sync_stop = model->sync_stop;
206			break;
207#endif
208		case PPC_OPROFILE_POWER4:
209			model = &op_model_power4;
210			break;
211		case PPC_OPROFILE_PA6T:
212			model = &op_model_pa6t;
213			break;
214#endif
215#ifdef CONFIG_6xx
216		case PPC_OPROFILE_G4:
217			model = &op_model_7450;
218			break;
219#endif
220#if defined(CONFIG_FSL_EMB_PERFMON)
221		case PPC_OPROFILE_FSL_EMB:
222			model = &op_model_fsl_emb;
223			break;
224#endif
225		default:
226			return -ENODEV;
227	}
228
229	model->num_counters = cur_cpu_spec->num_pmcs;
230
231	ops->cpu_type = cur_cpu_spec->oprofile_cpu_type;
232	ops->create_files = op_powerpc_create_files;
233	ops->setup = op_powerpc_setup;
234	ops->shutdown = op_powerpc_shutdown;
235	ops->start = op_powerpc_start;
236	ops->stop = op_powerpc_stop;
237	ops->backtrace = op_powerpc_backtrace;
238
239	printk(KERN_DEBUG "oprofile: using %s performance monitoring.\n",
240	       ops->cpu_type);
241
242	return 0;
243}
244
245void oprofile_arch_exit(void)
246{
247}