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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/alpha/oprofile/common.c
downloadconfigs-2.6.12-rc2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/alpha/oprofile/common.c')
-rw-r--r--arch/alpha/oprofile/common.c189
1 files changed, 189 insertions, 0 deletions
diff --git a/arch/alpha/oprofile/common.c b/arch/alpha/oprofile/common.c
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+/**
+ * @file arch/alpha/oprofile/common.c
+ *
+ * @remark Copyright 2002 OProfile authors
+ * @remark Read the file COPYING
+ *
+ * @author Richard Henderson <rth@twiddle.net>
+ */
+
+#include <linux/oprofile.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/errno.h>
+#include <asm/ptrace.h>
+#include <asm/system.h>
+
+#include "op_impl.h"
+
+extern struct op_axp_model op_model_ev4 __attribute__((weak));
+extern struct op_axp_model op_model_ev5 __attribute__((weak));
+extern struct op_axp_model op_model_pca56 __attribute__((weak));
+extern struct op_axp_model op_model_ev6 __attribute__((weak));
+extern struct op_axp_model op_model_ev67 __attribute__((weak));
+
+static struct op_axp_model *model;
+
+extern void (*perf_irq)(unsigned long, struct pt_regs *);
+static void (*save_perf_irq)(unsigned long, struct pt_regs *);
+
+static struct op_counter_config ctr[20];
+static struct op_system_config sys;
+static struct op_register_config reg;
+
+/* Called from do_entInt to handle the performance monitor interrupt. */
+
+static void
+op_handle_interrupt(unsigned long which, struct pt_regs *regs)
+{
+ model->handle_interrupt(which, regs, ctr);
+
+ /* If the user has selected an interrupt frequency that is
+ not exactly the width of the counter, write a new value
+ into the counter such that it'll overflow after N more
+ events. */
+ if ((reg.need_reset >> which) & 1)
+ model->reset_ctr(&reg, which);
+}
+
+static int
+op_axp_setup(void)
+{
+ unsigned long i, e;
+
+ /* Install our interrupt handler into the existing hook. */
+ save_perf_irq = perf_irq;
+ perf_irq = op_handle_interrupt;
+
+ /* Compute the mask of enabled counters. */
+ for (i = e = 0; i < model->num_counters; ++i)
+ if (ctr[i].enabled)
+ e |= 1 << i;
+ reg.enable = e;
+
+ /* Pre-compute the values to stuff in the hardware registers. */
+ model->reg_setup(&reg, ctr, &sys);
+
+ /* Configure the registers on all cpus. */
+ smp_call_function(model->cpu_setup, &reg, 0, 1);
+ model->cpu_setup(&reg);
+ return 0;
+}
+
+static void
+op_axp_shutdown(void)
+{
+ /* Remove our interrupt handler. We may be removing this module. */
+ perf_irq = save_perf_irq;
+}
+
+static void
+op_axp_cpu_start(void *dummy)
+{
+ wrperfmon(1, reg.enable);
+}
+
+static int
+op_axp_start(void)
+{
+ smp_call_function(op_axp_cpu_start, NULL, 0, 1);
+ op_axp_cpu_start(NULL);
+ return 0;
+}
+
+static inline void
+op_axp_cpu_stop(void *dummy)
+{
+ /* Disable performance monitoring for all counters. */
+ wrperfmon(0, -1);
+}
+
+static void
+op_axp_stop(void)
+{
+ smp_call_function(op_axp_cpu_stop, NULL, 0, 1);
+ op_axp_cpu_stop(NULL);
+}
+
+static int
+op_axp_create_files(struct super_block * sb, struct dentry * root)
+{
+ int i;
+
+ for (i = 0; i < model->num_counters; ++i) {
+ struct dentry *dir;
+ char buf[3];
+
+ snprintf(buf, sizeof buf, "%d", i);
+ dir = oprofilefs_mkdir(sb, root, buf);
+
+ oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
+ oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
+ oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
+ /* Dummies. */
+ oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
+ oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
+ oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
+ }
+
+ if (model->can_set_proc_mode) {
+ oprofilefs_create_ulong(sb, root, "enable_pal",
+ &sys.enable_pal);
+ oprofilefs_create_ulong(sb, root, "enable_kernel",
+ &sys.enable_kernel);
+ oprofilefs_create_ulong(sb, root, "enable_user",
+ &sys.enable_user);
+ }
+
+ return 0;
+}
+
+int __init
+oprofile_arch_init(struct oprofile_operations *ops)
+{
+ struct op_axp_model *lmodel = NULL;
+
+ switch (implver()) {
+ case IMPLVER_EV4:
+ lmodel = &op_model_ev4;
+ break;
+ case IMPLVER_EV5:
+ /* 21164PC has a slightly different set of events.
+ Recognize the chip by the presence of the MAX insns. */
+ if (!amask(AMASK_MAX))
+ lmodel = &op_model_pca56;
+ else
+ lmodel = &op_model_ev5;
+ break;
+ case IMPLVER_EV6:
+ /* 21264A supports ProfileMe.
+ Recognize the chip by the presence of the CIX insns. */
+ if (!amask(AMASK_CIX))
+ lmodel = &op_model_ev67;
+ else
+ lmodel = &op_model_ev6;
+ break;
+ }
+
+ if (!lmodel)
+ return -ENODEV;
+ model = lmodel;
+
+ ops->create_files = op_axp_create_files;
+ ops->setup = op_axp_setup;
+ ops->shutdown = op_axp_shutdown;
+ ops->start = op_axp_start;
+ ops->stop = op_axp_stop;
+ ops->cpu_type = lmodel->cpu_type;
+
+ printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
+ lmodel->cpu_type);
+
+ return 0;
+}
+
+
+void
+oprofile_arch_exit(void)
+{
+}