| /** |
| * @file op_model_athlon.h |
| * athlon / K7 model-specific MSR operations |
| * |
| * @remark Copyright 2002 OProfile authors |
| * @remark Read the file COPYING |
| * |
| * @author John Levon |
| * @author Philippe Elie |
| * @author Graydon Hoare |
| */ |
| |
| #include <linux/oprofile.h> |
| #include <asm/ptrace.h> |
| #include <asm/msr.h> |
| #include <asm/nmi.h> |
| |
| #include "op_x86_model.h" |
| #include "op_counter.h" |
| |
| #define NUM_COUNTERS 4 |
| #define NUM_CONTROLS 4 |
| |
| #define CTR_READ(l,h,msrs,c) do {rdmsr(msrs->counters[(c)].addr, (l), (h));} while (0) |
| #define CTR_WRITE(l,msrs,c) do {wrmsr(msrs->counters[(c)].addr, -(unsigned int)(l), -1);} while (0) |
| #define CTR_OVERFLOWED(n) (!((n) & (1U<<31))) |
| |
| #define CTRL_READ(l,h,msrs,c) do {rdmsr(msrs->controls[(c)].addr, (l), (h));} while (0) |
| #define CTRL_WRITE(l,h,msrs,c) do {wrmsr(msrs->controls[(c)].addr, (l), (h));} while (0) |
| #define CTRL_SET_ACTIVE(n) (n |= (1<<22)) |
| #define CTRL_SET_INACTIVE(n) (n &= ~(1<<22)) |
| #define CTRL_CLEAR(x) (x &= (1<<21)) |
| #define CTRL_SET_ENABLE(val) (val |= 1<<20) |
| #define CTRL_SET_USR(val,u) (val |= ((u & 1) << 16)) |
| #define CTRL_SET_KERN(val,k) (val |= ((k & 1) << 17)) |
| #define CTRL_SET_UM(val, m) (val |= (m << 8)) |
| #define CTRL_SET_EVENT(val, e) (val |= e) |
| |
| static unsigned long reset_value[NUM_COUNTERS]; |
| |
| static void athlon_fill_in_addresses(struct op_msrs * const msrs) |
| { |
| msrs->counters[0].addr = MSR_K7_PERFCTR0; |
| msrs->counters[1].addr = MSR_K7_PERFCTR1; |
| msrs->counters[2].addr = MSR_K7_PERFCTR2; |
| msrs->counters[3].addr = MSR_K7_PERFCTR3; |
| |
| msrs->controls[0].addr = MSR_K7_EVNTSEL0; |
| msrs->controls[1].addr = MSR_K7_EVNTSEL1; |
| msrs->controls[2].addr = MSR_K7_EVNTSEL2; |
| msrs->controls[3].addr = MSR_K7_EVNTSEL3; |
| } |
| |
| |
| static void athlon_setup_ctrs(struct op_msrs const * const msrs) |
| { |
| unsigned int low, high; |
| int i; |
| |
| /* clear all counters */ |
| for (i = 0 ; i < NUM_CONTROLS; ++i) { |
| CTRL_READ(low, high, msrs, i); |
| CTRL_CLEAR(low); |
| CTRL_WRITE(low, high, msrs, i); |
| } |
| |
| /* avoid a false detection of ctr overflows in NMI handler */ |
| for (i = 0; i < NUM_COUNTERS; ++i) { |
| CTR_WRITE(1, msrs, i); |
| } |
| |
| /* enable active counters */ |
| for (i = 0; i < NUM_COUNTERS; ++i) { |
| if (counter_config[i].enabled) { |
| reset_value[i] = counter_config[i].count; |
| |
| CTR_WRITE(counter_config[i].count, msrs, i); |
| |
| CTRL_READ(low, high, msrs, i); |
| CTRL_CLEAR(low); |
| CTRL_SET_ENABLE(low); |
| CTRL_SET_USR(low, counter_config[i].user); |
| CTRL_SET_KERN(low, counter_config[i].kernel); |
| CTRL_SET_UM(low, counter_config[i].unit_mask); |
| CTRL_SET_EVENT(low, counter_config[i].event); |
| CTRL_WRITE(low, high, msrs, i); |
| } else { |
| reset_value[i] = 0; |
| } |
| } |
| } |
| |
| |
| static int athlon_check_ctrs(struct pt_regs * const regs, |
| struct op_msrs const * const msrs) |
| { |
| unsigned int low, high; |
| int i; |
| |
| for (i = 0 ; i < NUM_COUNTERS; ++i) { |
| CTR_READ(low, high, msrs, i); |
| if (CTR_OVERFLOWED(low)) { |
| oprofile_add_sample(regs, i); |
| CTR_WRITE(reset_value[i], msrs, i); |
| } |
| } |
| |
| /* See op_model_ppro.c */ |
| return 1; |
| } |
| |
| |
| static void athlon_start(struct op_msrs const * const msrs) |
| { |
| unsigned int low, high; |
| int i; |
| for (i = 0 ; i < NUM_COUNTERS ; ++i) { |
| if (reset_value[i]) { |
| CTRL_READ(low, high, msrs, i); |
| CTRL_SET_ACTIVE(low); |
| CTRL_WRITE(low, high, msrs, i); |
| } |
| } |
| } |
| |
| |
| static void athlon_stop(struct op_msrs const * const msrs) |
| { |
| unsigned int low,high; |
| int i; |
| |
| /* Subtle: stop on all counters to avoid race with |
| * setting our pm callback */ |
| for (i = 0 ; i < NUM_COUNTERS ; ++i) { |
| CTRL_READ(low, high, msrs, i); |
| CTRL_SET_INACTIVE(low); |
| CTRL_WRITE(low, high, msrs, i); |
| } |
| } |
| |
| |
| struct op_x86_model_spec const op_athlon_spec = { |
| .num_counters = NUM_COUNTERS, |
| .num_controls = NUM_CONTROLS, |
| .fill_in_addresses = &athlon_fill_in_addresses, |
| .setup_ctrs = &athlon_setup_ctrs, |
| .check_ctrs = &athlon_check_ctrs, |
| .start = &athlon_start, |
| .stop = &athlon_stop |
| }; |