forked from luck/tmp_suning_uos_patched
1da177e4c3
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!
144 lines
3.8 KiB
C
144 lines
3.8 KiB
C
/**
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* @file op_model_ppro.h
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* pentium pro / P6 model-specific MSR operations
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*
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* @remark Copyright 2002 OProfile authors
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* @remark Read the file COPYING
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*
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* @author John Levon
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* @author Philippe Elie
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* @author Graydon Hoare
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*/
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#include <linux/oprofile.h>
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#include <asm/ptrace.h>
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#include <asm/msr.h>
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#include <asm/apic.h>
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#include "op_x86_model.h"
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#include "op_counter.h"
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#define NUM_COUNTERS 2
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#define NUM_CONTROLS 2
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#define CTR_READ(l,h,msrs,c) do {rdmsr(msrs->counters[(c)].addr, (l), (h));} while (0)
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#define CTR_WRITE(l,msrs,c) do {wrmsr(msrs->counters[(c)].addr, -(u32)(l), -1);} while (0)
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#define CTR_OVERFLOWED(n) (!((n) & (1U<<31)))
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#define CTRL_READ(l,h,msrs,c) do {rdmsr((msrs->controls[(c)].addr), (l), (h));} while (0)
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#define CTRL_WRITE(l,h,msrs,c) do {wrmsr((msrs->controls[(c)].addr), (l), (h));} while (0)
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#define CTRL_SET_ACTIVE(n) (n |= (1<<22))
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#define CTRL_SET_INACTIVE(n) (n &= ~(1<<22))
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#define CTRL_CLEAR(x) (x &= (1<<21))
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#define CTRL_SET_ENABLE(val) (val |= 1<<20)
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#define CTRL_SET_USR(val,u) (val |= ((u & 1) << 16))
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#define CTRL_SET_KERN(val,k) (val |= ((k & 1) << 17))
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#define CTRL_SET_UM(val, m) (val |= (m << 8))
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#define CTRL_SET_EVENT(val, e) (val |= e)
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static unsigned long reset_value[NUM_COUNTERS];
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static void ppro_fill_in_addresses(struct op_msrs * const msrs)
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{
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msrs->counters[0].addr = MSR_P6_PERFCTR0;
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msrs->counters[1].addr = MSR_P6_PERFCTR1;
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msrs->controls[0].addr = MSR_P6_EVNTSEL0;
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msrs->controls[1].addr = MSR_P6_EVNTSEL1;
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}
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static void ppro_setup_ctrs(struct op_msrs const * const msrs)
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{
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unsigned int low, high;
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int i;
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/* clear all counters */
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for (i = 0 ; i < NUM_CONTROLS; ++i) {
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CTRL_READ(low, high, msrs, i);
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CTRL_CLEAR(low);
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CTRL_WRITE(low, high, msrs, i);
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}
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/* avoid a false detection of ctr overflows in NMI handler */
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for (i = 0; i < NUM_COUNTERS; ++i) {
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CTR_WRITE(1, msrs, i);
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}
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/* enable active counters */
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for (i = 0; i < NUM_COUNTERS; ++i) {
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if (counter_config[i].enabled) {
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reset_value[i] = counter_config[i].count;
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CTR_WRITE(counter_config[i].count, msrs, i);
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CTRL_READ(low, high, msrs, i);
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CTRL_CLEAR(low);
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CTRL_SET_ENABLE(low);
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CTRL_SET_USR(low, counter_config[i].user);
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CTRL_SET_KERN(low, counter_config[i].kernel);
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CTRL_SET_UM(low, counter_config[i].unit_mask);
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CTRL_SET_EVENT(low, counter_config[i].event);
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CTRL_WRITE(low, high, msrs, i);
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}
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}
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}
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static int ppro_check_ctrs(struct pt_regs * const regs,
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struct op_msrs const * const msrs)
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{
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unsigned int low, high;
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int i;
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for (i = 0 ; i < NUM_COUNTERS; ++i) {
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CTR_READ(low, high, msrs, i);
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if (CTR_OVERFLOWED(low)) {
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oprofile_add_sample(regs, i);
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CTR_WRITE(reset_value[i], msrs, i);
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}
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}
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/* Only P6 based Pentium M need to re-unmask the apic vector but it
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* doesn't hurt other P6 variant */
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apic_write(APIC_LVTPC, apic_read(APIC_LVTPC) & ~APIC_LVT_MASKED);
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/* We can't work out if we really handled an interrupt. We
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* might have caught a *second* counter just after overflowing
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* the interrupt for this counter then arrives
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* and we don't find a counter that's overflowed, so we
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* would return 0 and get dazed + confused. Instead we always
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* assume we found an overflow. This sucks.
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*/
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return 1;
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}
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static void ppro_start(struct op_msrs const * const msrs)
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{
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unsigned int low,high;
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CTRL_READ(low, high, msrs, 0);
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CTRL_SET_ACTIVE(low);
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CTRL_WRITE(low, high, msrs, 0);
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}
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static void ppro_stop(struct op_msrs const * const msrs)
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{
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unsigned int low,high;
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CTRL_READ(low, high, msrs, 0);
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CTRL_SET_INACTIVE(low);
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CTRL_WRITE(low, high, msrs, 0);
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}
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struct op_x86_model_spec const op_ppro_spec = {
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.num_counters = NUM_COUNTERS,
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.num_controls = NUM_CONTROLS,
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.fill_in_addresses = &ppro_fill_in_addresses,
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.setup_ctrs = &ppro_setup_ctrs,
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.check_ctrs = &ppro_check_ctrs,
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.start = &ppro_start,
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.stop = &ppro_stop
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};
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