1 files changed, 243 insertions, 0 deletions
diff --git a/arch/powerpc/oprofile/common.c b/arch/powerpc/oprofile/common.c
new file mode 100644
index 000000000..0fb528c2b
--- /dev/null
+++ b/arch/powerpc/oprofile/common.c
@@ -0,0 +1,243 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * PPC 64 oprofile support:
+ * Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
+ * PPC 32 oprofile support: (based on PPC 64 support)
+ * Copyright (C) Freescale Semiconductor, Inc 2004
+ *	Author: Andy Fleming
+ *
+ * Based on alpha version.
+ */
+
+#include <linux/oprofile.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/errno.h>
+#include <asm/ptrace.h>
+#include <asm/pmc.h>
+#include <asm/cputable.h>
+#include <asm/oprofile_impl.h>
+#include <asm/firmware.h>
+
+static struct op_powerpc_model *model;
+
+static struct op_counter_config ctr[OP_MAX_COUNTER];
+static struct op_system_config sys;
+
+static int op_per_cpu_rc;
+
+static void op_handle_interrupt(struct pt_regs *regs)
+{
+	model->handle_interrupt(regs, ctr);
+}
+
+static void op_powerpc_cpu_setup(void *dummy)
+{
+	int ret;
+
+	ret = model->cpu_setup(ctr);
+
+	if (ret != 0)
+		op_per_cpu_rc = ret;
+}
+
+static int op_powerpc_setup(void)
+{
+	int err;
+
+	op_per_cpu_rc = 0;
+
+	/* Grab the hardware */
+	err = reserve_pmc_hardware(op_handle_interrupt);
+	if (err)
+		return err;
+
+	/* Pre-compute the values to stuff in the hardware registers.  */
+	op_per_cpu_rc = model->reg_setup(ctr, &sys, model->num_counters);
+
+	if (op_per_cpu_rc)
+		goto out;
+
+	/* Configure the registers on all cpus.	 If an error occurs on one
+	 * of the cpus, op_per_cpu_rc will be set to the error */
+	on_each_cpu(op_powerpc_cpu_setup, NULL, 1);
+
+out:	if (op_per_cpu_rc) {
+		/* error on setup release the performance counter hardware */
+		release_pmc_hardware();
+	}
+
+	return op_per_cpu_rc;
+}
+
+static void op_powerpc_shutdown(void)
+{
+	release_pmc_hardware();
+}
+
+static void op_powerpc_cpu_start(void *dummy)
+{
+	/* If any of the cpus have return an error, set the
+	 * global flag to the error so it can be returned
+	 * to the generic OProfile caller.
+	 */
+	int ret;
+
+	ret = model->start(ctr);
+	if (ret != 0)
+		op_per_cpu_rc = ret;
+}
+
+static int op_powerpc_start(void)
+{
+	op_per_cpu_rc = 0;
+
+	if (model->global_start)
+		return model->global_start(ctr);
+	if (model->start) {
+		on_each_cpu(op_powerpc_cpu_start, NULL, 1);
+		return op_per_cpu_rc;
+	}
+	return -EIO; /* No start function is defined for this
+			power architecture */
+}
+
+static inline void op_powerpc_cpu_stop(void *dummy)
+{
+	model->stop();
+}
+
+static void op_powerpc_stop(void)
+{
+	if (model->stop)
+		on_each_cpu(op_powerpc_cpu_stop, NULL, 1);
+        if (model->global_stop)
+                model->global_stop();
+}
+
+static int op_powerpc_create_files(struct dentry *root)
+{
+	int i;
+
+#ifdef CONFIG_PPC64
+	/*
+	 * There is one mmcr0, mmcr1 and mmcra for setting the events for
+	 * all of the counters.
+	 */
+	oprofilefs_create_ulong(root, "mmcr0", &sys.mmcr0);
+	oprofilefs_create_ulong(root, "mmcr1", &sys.mmcr1);
+	oprofilefs_create_ulong(root, "mmcra", &sys.mmcra);
+#ifdef CONFIG_OPROFILE_CELL
+	/* create a file the user tool can check to see what level of profiling
+	 * support exits with this kernel. Initialize bit mask to indicate
+	 * what support the kernel has:
+	 * bit 0      -  Supports SPU event profiling in addition to PPU
+	 *               event and cycles; and SPU cycle profiling
+	 * bits 1-31  -  Currently unused.
+	 *
+	 * If the file does not exist, then the kernel only supports SPU
+	 * cycle profiling, PPU event and cycle profiling.
+	 */
+	oprofilefs_create_ulong(root, "cell_support", &sys.cell_support);
+	sys.cell_support = 0x1; /* Note, the user OProfile tool must check
+				 * that this bit is set before attempting to
+				 * user SPU event profiling.  Older kernels
+				 * will not have this file, hence the user
+				 * tool is not allowed to do SPU event
+				 * profiling on older kernels.  Older kernels
+				 * will accept SPU events but collected data
+				 * is garbage.
+				 */
+#endif
+#endif
+
+	for (i = 0; i < model->num_counters; ++i) {
+		struct dentry *dir;
+		char buf[4];
+
+		snprintf(buf, sizeof buf, "%d", i);
+		dir = oprofilefs_mkdir(root, buf);
+
+		oprofilefs_create_ulong(dir, "enabled", &ctr[i].enabled);
+		oprofilefs_create_ulong(dir, "event", &ctr[i].event);
+		oprofilefs_create_ulong(dir, "count", &ctr[i].count);
+
+		/*
+		 * Classic PowerPC doesn't support per-counter
+		 * control like this, but the options are
+		 * expected, so they remain.  For Freescale
+		 * Book-E style performance monitors, we do
+		 * support them.
+		 */
+		oprofilefs_create_ulong(dir, "kernel", &ctr[i].kernel);
+		oprofilefs_create_ulong(dir, "user", &ctr[i].user);
+
+		oprofilefs_create_ulong(dir, "unit_mask", &ctr[i].unit_mask);
+	}
+
+	oprofilefs_create_ulong(root, "enable_kernel", &sys.enable_kernel);
+	oprofilefs_create_ulong(root, "enable_user", &sys.enable_user);
+
+	/* Default to tracing both kernel and user */
+	sys.enable_kernel = 1;
+	sys.enable_user = 1;
+
+	return 0;
+}
+
+int __init oprofile_arch_init(struct oprofile_operations *ops)
+{
+	if (!cur_cpu_spec->oprofile_cpu_type)
+		return -ENODEV;
+
+	switch (cur_cpu_spec->oprofile_type) {
+#ifdef CONFIG_PPC_BOOK3S_64
+#ifdef CONFIG_OPROFILE_CELL
+		case PPC_OPROFILE_CELL:
+			if (firmware_has_feature(FW_FEATURE_LPAR))
+				return -ENODEV;
+			model = &op_model_cell;
+			ops->sync_start = model->sync_start;
+			ops->sync_stop = model->sync_stop;
+			break;
+#endif
+		case PPC_OPROFILE_POWER4:
+			model = &op_model_power4;
+			break;
+		case PPC_OPROFILE_PA6T:
+			model = &op_model_pa6t;
+			break;
+#endif
+#ifdef CONFIG_PPC_BOOK3S_32
+		case PPC_OPROFILE_G4:
+			model = &op_model_7450;
+			break;
+#endif
+#if defined(CONFIG_FSL_EMB_PERFMON)
+		case PPC_OPROFILE_FSL_EMB:
+			model = &op_model_fsl_emb;
+			break;
+#endif
+		default:
+			return -ENODEV;
+	}
+
+	model->num_counters = cur_cpu_spec->num_pmcs;
+
+	ops->cpu_type = cur_cpu_spec->oprofile_cpu_type;
+	ops->create_files = op_powerpc_create_files;
+	ops->setup = op_powerpc_setup;
+	ops->shutdown = op_powerpc_shutdown;
+	ops->start = op_powerpc_start;
+	ops->stop = op_powerpc_stop;
+	ops->backtrace = op_powerpc_backtrace;
+
+	printk(KERN_DEBUG "oprofile: using %s performance monitoring.\n",
+	       ops->cpu_type);
+
+	return 0;
+}
+
+void oprofile_arch_exit(void)
+{
+}