/**
* @file op_model_p4.c
* P4 model-specific MSR operations
*
* @remark Copyright 2002 OProfile authors
* @remark Read the file COPYING
*
* @author Graydon Hoare
*/
#include "op_x86_model.h"
#include "op_msr.h"
#include "op_apic.h"
#include "op_arch.h"
#define NUM_EVENTS 39
#define NUM_COUNTERS_NON_HT 8
#define NUM_ESCRS_NON_HT 45
#define NUM_CCCRS_NON_HT 18
#define NUM_CONTROLS_NON_HT (NUM_ESCRS_NON_HT + NUM_CCCRS_NON_HT)
#define NUM_COUNTERS_HT2 4
#define NUM_ESCRS_HT2 23
#define NUM_CCCRS_HT2 9
#define NUM_CONTROLS_HT2 (NUM_ESCRS_HT2 + NUM_CCCRS_HT2)
static unsigned int num_counters = NUM_COUNTERS_NON_HT;
/* this has to be checked dynamically since the
hyper-threadedness of a chip is discovered at
kernel boot-time. */
static inline void setup_num_counters(void)
{
#ifdef HT_SUPPORT
if (smp_num_siblings == 2)
num_counters = NUM_COUNTERS_HT2;
#endif
}
static int inline addr_increment(void)
{
#ifdef HT_SUPPORT
return smp_num_siblings == 2 ? 2 : 1;
#else
return 1;
#endif
}
/* tables to simulate simplified hardware view of p4 registers */
struct p4_counter_binding {
int virt_counter;
int counter_address;
int cccr_address;
};
struct p4_event_binding {
/* value to put in CCCR */
int escr_select;
/* value to put in ESCR */
int event_select;
struct {
/* for this counter... */
int virt_counter;
/* use this ESCR */
int escr_address;
} bindings[2];
};
/* nb: these CTR_* defines are a duplicate of defines in
event/i386.p4*events. */
#define CTR_BPU_0 (1 << 0)
#define CTR_MS_0 (1 << 1)
#define CTR_FLAME_0 (1 << 2)
#define CTR_IQ_4 (1 << 3)
#define CTR_BPU_2 (1 << 4)
#define CTR_MS_2 (1 << 5)
#define CTR_FLAME_2 (1 << 6)
#define CTR_IQ_5 (1 << 7)
static struct p4_counter_binding p4_counters[NUM_COUNTERS_NON_HT] = {
{ CTR_BPU_0, MSR_P4_BPU_PERFCTR0, MSR_P4_BPU_CCCR0 },
{ CTR_MS_0, MSR_P4_MS_PERFCTR0, MSR_P4_MS_CCCR0 },
{ CTR_FLAME_0, MSR_P4_FLAME_PERFCTR0, MSR_P4_FLAME_CCCR0 },
{ CTR_IQ_4, MSR_P4_IQ_PERFCTR4, MSR_P4_IQ_CCCR4 },
{ CTR_BPU_2, MSR_P4_BPU_PERFCTR2, MSR_P4_BPU_CCCR2 },
{ CTR_MS_2, MSR_P4_MS_PERFCTR2, MSR_P4_MS_CCCR2 },
{ CTR_FLAME_2, MSR_P4_FLAME_PERFCTR2, MSR_P4_FLAME_CCCR2 },
{ CTR_IQ_5, MSR_P4_IQ_PERFCTR5, MSR_P4_IQ_CCCR5 }
};
#define NUM_UNUSED_CCCRS NUM_CCCRS_NON_HT - NUM_COUNTERS_NON_HT
/* All cccr we don't use. */
static int p4_unused_cccr[NUM_UNUSED_CCCRS] = {
MSR_P4_BPU_CCCR1, MSR_P4_BPU_CCCR3,
MSR_P4_MS_CCCR1, MSR_P4_MS_CCCR3,
MSR_P4_FLAME_CCCR1, MSR_P4_FLAME_CCCR3,
MSR_P4_IQ_CCCR0, MSR_P4_IQ_CCCR1,
MSR_P4_IQ_CCCR2, MSR_P4_IQ_CCCR3
};
/* p4 event codes in libop/op_event.h are indices into this table. */
static struct p4_event_binding p4_events[NUM_EVENTS] = {
{ /* BRANCH_RETIRED */
0x05, 0x06,
{ {CTR_IQ_4, MSR_P4_CRU_ESCR2},
{CTR_IQ_5, MSR_P4_CRU_ESCR3} }
},
{ /* MISPRED_BRANCH_RETIRED */
0x04, 0x03,
{ { CTR_IQ_4, MSR_P4_CRU_ESCR0},
{ CTR_IQ_5, MSR_P4_CRU_ESCR1} }
},
{ /* TC_DELIVER_MODE */
0x01, 0x01,
{ { CTR_MS_0, MSR_P4_TC_ESCR0},
{ CTR_MS_2, MSR_P4_TC_ESCR1} }
},
{ /* BPU_FETCH_REQUEST */
0x00, 0x03,
{ { CTR_BPU_0, MSR_P4_BPU_ESCR0},
{ CTR_BPU_2, MSR_P4_BPU_ESCR1} }
},
{ /* ITLB_REFERENCE */
0x03, 0x18,
{ { CTR_BPU_0, MSR_P4_ITLB_ESCR0},
{ CTR_BPU_2, MSR_P4_ITLB_ESCR1} }
},
{ /* MEMORY_CANCEL */
0x05, 0x02,
{ { CTR_FLAME_0, MSR_P4_DAC_ESCR0},
{ CTR_FLAME_2, MSR_P4_DAC_ESCR1} }
},
{ /* MEMORY_COMPLETE */
0x02, 0x08,
{ { CTR_FLAME_0, MSR_P4_SAAT_ESCR0},
{ CTR_FLAME_2, MSR_P4_SAAT_ESCR1} }
},
{ /* LOAD_PORT_REPLAY */
0x02, 0x04,
{ { CTR_FLAME_0, MSR_P4_SAAT_ESCR0},
{ CTR_FLAME_2, MSR_P4_SAAT_ESCR1} }
},
{ /* STORE_PORT_REPLAY */
0x02, 0x05,
{ { CTR_FLAME_0, MSR_P4_SAAT_ESCR0},
{ CTR_FLAME_2, MSR_P4_SAAT_ESCR1} }
},
{ /* MOB_LOAD_REPLAY */
0x02, 0x03,
{ { CTR_BPU_0, MSR_P4_MOB_ESCR0},
{ CTR_BPU_2, MSR_P4_MOB_ESCR1} }
},
{ /* PAGE_WALK_TYPE */
0x04, 0x01,
{ { CTR_BPU_0, MSR_P4_PMH_ESCR0},
{ CTR_BPU_2, MSR_P4_PMH_ESCR1} }
},
{ /* BSQ_CACHE_REFERENCE */
0x07, 0x0c,
{ { CTR_BPU_0, MSR_P4_BSU_ESCR0},
{ CTR_BPU_2, MSR_P4_BSU_ESCR1} }
},
/* intel doc vol 3 table A-1: P4 and xeon with cpuid signature < 0xf27
* doen't allow MSR_FSB_ESCR1 so only counter 0 is available */
{ /* IOQ_ALLOCATION */
0x06, 0x03,
{ { CTR_BPU_0, MSR_P4_FSB_ESCR0},
{ 0, 0 } }
},
{ /* IOQ_ACTIVE_ENTRIES */
0x06, 0x1a,
{ { CTR_BPU_2, MSR_P4_FSB_ESCR1},
{ 0, 0 } }
},
{ /* FSB_DATA_ACTIVITY */
0x06, 0x17,
{ { CTR_BPU_0, MSR_P4_FSB_ESCR0},
{ CTR_BPU_2, MSR_P4_FSB_ESCR1} }
},
{ /* BSQ_ALLOCATION */
0x07, 0x05,
{ { CTR_BPU_0, MSR_P4_BSU_ESCR0},
{ 0, 0 } }
},
{ /* BSQ_ACTIVE_ENTRIES */
0x07, 0x06,
/* FIXME intel doc don't say which ESCR1 to use, using
BSU_ESCR1 is a sensible guess but will need validation */
{ { CTR_BPU_2, MSR_P4_BSU_ESCR1 },
{ 0, 0 } }
},
{ /* X87_ASSIST */
0x05, 0x03,
{ { CTR_IQ_4, MSR_P4_CRU_ESCR2},
{ CTR_IQ_5, MSR_P4_CRU_ESCR3} }
},
{ /* SSE_INPUT_ASSIST */
0x01, 0x34,
{ { CTR_FLAME_0, MSR_P4_FIRM_ESCR0},
{ CTR_FLAME_2, MSR_P4_FIRM_ESCR1} }
},
{ /* PACKED_SP_UOP */
0x01, 0x08,
{ { CTR_FLAME_0, MSR_P4_FIRM_ESCR0},
{ CTR_FLAME_2, MSR_P4_FIRM_ESCR1} }
},
{ /* PACKED_DP_UOP */
0x01, 0x0c,
{ { CTR_FLAME_0, MSR_P4_FIRM_ESCR0},
{ CTR_FLAME_2, MSR_P4_FIRM_ESCR1} }
},
{ /* SCALAR_SP_UOP */
0x01, 0x0a,
{ { CTR_FLAME_0, MSR_P4_FIRM_ESCR0},
{ CTR_FLAME_2, MSR_P4_FIRM_ESCR1} }
},
{ /* SCALAR_DP_UOP */
0x01, 0x0e,
{ { CTR_FLAME_0, MSR_P4_FIRM_ESCR0},
{ CTR_FLAME_2, MSR_P4_FIRM_ESCR1} }
},
{ /* 64BIT_MMX_UOP */
0x01, 0x02,
{ { CTR_FLAME_0, MSR_P4_FIRM_ESCR0},
{ CTR_FLAME_2, MSR_P4_FIRM_ESCR1} }
},
{ /* 128BIT_MMX_UOP */
0x01, 0x1a,
{ { CTR_FLAME_0, MSR_P4_FIRM_ESCR0},
{ CTR_FLAME_2, MSR_P4_FIRM_ESCR1} }
},
{ /* X87_FP_UOP */
0x01, 0x04,
{ { CTR_FLAME_0, MSR_P4_FIRM_ESCR0},
{ CTR_FLAME_2, MSR_P4_FIRM_ESCR1} }
},
{ /* X87_SIMD_MOVES_UOP */
0x01, 0x2e,
{ { CTR_FLAME_0, MSR_P4_FIRM_ESCR0},
{ CTR_FLAME_2, MSR_P4_FIRM_ESCR1} }
},
{ /* MACHINE_CLEAR */
0x05, 0x02,
{ { CTR_IQ_4, MSR_P4_CRU_ESCR2},
{ CTR_IQ_5, MSR_P4_CRU_ESCR3} }
},
{ /* GLOBAL_POWER_EVENTS */
0x06, 0x13 /* older manual says 0x05, newer 0x13 */,
{ { CTR_BPU_0, MSR_P4_FSB_ESCR0},
{ CTR_BPU_2, MSR_P4_FSB_ESCR1} }
},
{ /* TC_MS_XFER */
0x00, 0x05,
{ { CTR_MS_0, MSR_P4_MS_ESCR0},
{ CTR_MS_2, MSR_P4_MS_ESCR1} }
},
{ /* UOP_QUEUE_WRITES */
0x00, 0x09,
{ { CTR_MS_0, MSR_P4_MS_ESCR0},
{ CTR_MS_2, MSR_P4_MS_ESCR1} }
},
{ /* FRONT_END_EVENT */
0x05, 0x08,
{ { CTR_IQ_4, MSR_P4_CRU_ESCR2},
{ CTR_IQ_5, MSR_P4_CRU_ESCR3} }
},
{ /* EXECUTION_EVENT */
0x05, 0x0c,
{ { CTR_IQ_4, MSR_P4_CRU_ESCR2},
{ CTR_IQ_5, MSR_P4_CRU_ESCR3} }
},
{ /* REPLAY_EVENT */
0x05, 0x09,
{ { CTR_IQ_4, MSR_P4_CRU_ESCR2},
{ CTR_IQ_5, MSR_P4_CRU_ESCR3} }
},
{ /* INSTR_RETIRED */
0x04, 0x02,
{ { CTR_IQ_4, MSR_P4_CRU_ESCR0},
{ CTR_IQ_5, MSR_P4_CRU_ESCR1} }
},
{ /* UOPS_RETIRED */
0x04, 0x01,
{ { CTR_IQ_4, MSR_P4_CRU_ESCR0},
{ CTR_IQ_5, MSR_P4_CRU_ESCR1} }
},
{ /* UOP_TYPE */
0x02, 0x02,
{ { CTR_IQ_4, MSR_P4_RAT_ESCR0},
{ CTR_IQ_5, MSR_P4_RAT_ESCR1} }
},
{ /* RETIRED_MISPRED_BRANCH_TYPE */
0x02, 0x05,
{ { CTR_MS_0, MSR_P4_TBPU_ESCR0},
{ CTR_MS_2, MSR_P4_TBPU_ESCR1} }
},
{ /* RETIRED_BRANCH_TYPE */
0x02, 0x04,
{ { CTR_MS_0, MSR_P4_TBPU_ESCR0},
{ CTR_MS_2, MSR_P4_TBPU_ESCR1} }
}
};
#define MISC_PMC_ENABLED_P(x) ((x) & 1 << 7)
#define ESCR_RESERVED_BITS 0x80000003
#define ESCR_CLEAR(escr) ((escr) &= ESCR_RESERVED_BITS)
#define ESCR_SET_USR_0(escr, usr) ((escr) |= (((usr) & 1) << 2))
#define ESCR_SET_OS_0(escr, os) ((escr) |= (((os) & 1) << 3))
#define ESCR_SET_USR_1(escr, usr) ((escr) |= (((usr) & 1)))
#define ESCR_SET_OS_1(escr, os) ((escr) |= (((os) & 1) << 1))
#define ESCR_SET_EVENT_SELECT(escr, sel) ((escr) |= (((sel) & 0x3f) << 25))
#define ESCR_SET_EVENT_MASK(escr, mask) ((escr) |= (((mask) & 0xffff) << 9))
#define ESCR_READ(escr, high, ev, i) do {rdmsr(ev->bindings[(i)].escr_address, (escr), (high));} while (0)
#define ESCR_WRITE(escr, high, ev, i) do {wrmsr(ev->bindings[(i)].escr_address, (escr), (high));} while (0)
#define CCCR_RESERVED_BITS 0x38030FFF
#define CCCR_CLEAR(cccr) ((cccr) &= CCCR_RESERVED_BITS)
#define CCCR_SET_REQUIRED_BITS(cccr) ((cccr) |= 0x00030000)
#define CCCR_SET_ESCR_SELECT(cccr, sel) ((cccr) |= (((sel) & 0x07) << 13))
#define CCCR_SET_PMI_OVF_0(cccr) ((cccr) |= (1 << 26))
#define CCCR_SET_PMI_OVF_1(cccr) ((cccr) |= (1 << 27))
#define CCCR_SET_ENABLE(cccr) ((cccr) |= (1 << 12))
#define CCCR_SET_DISABLE(cccr) ((cccr) &= ~(1 << 12))
#define CCCR_READ(low, high, i) do {rdmsr(p4_counters[(i)].cccr_address, (low), (high));} while (0)
#define CCCR_WRITE(low, high, i) do {wrmsr(p4_counters[(i)].cccr_address, (low), (high));} while (0)
#define CCCR_OVF_P(cccr) ((cccr) & (1U << 31))
#define CCCR_CLEAR_OVF(cccr) ((cccr) &= (~(1U << 31)))
#define CTR_READ(l, h, i) do {rdmsr(p4_counters[(i)].counter_address, (l), (h));} while (0)
#define CTR_WRITE(l, i) do {wrmsr(p4_counters[(i)].counter_address, -(u32)(l), -1);} while (0)
#define CTR_OVERFLOW_P(ctr) (!((ctr) & 0x80000000))
/* this assigns a "stagger" to the current CPU, which is used throughout
the code in this module as an extra array offset, to select the "even"
or "odd" part of all the divided resources. */
static unsigned int get_stagger(void)
{
#ifdef HT_SUPPORT
int cpu;
if (smp_num_siblings > 1) {
cpu = smp_processor_id();
return (cpu_sibling_map[cpu] > cpu) ? 0 : 1;
}
#endif
return 0;
}
/* finally, mediate access to a real hardware counter
by passing a "virtual" counter numer to this macro,
along with your stagger setting. */
#define VIRT_CTR(stagger, i) ((i) + ((num_counters) * (stagger)))
static void p4_fill_in_addresses(struct op_msrs * const msrs)
{
unsigned int i;
unsigned int addr, stag;
setup_num_counters();
stag = get_stagger();
/* the counter registers we pay attention to */
for (i = 0; i < num_counters; ++i) {
msrs->counters.addrs[i] =
p4_counters[VIRT_CTR(stag, i)].counter_address;
}
/* FIXME: bad feeling, we don't save the 10 counters we don't use. */
/* 18 CCCR registers */
for (i = 0, addr = MSR_P4_BPU_CCCR0 + stag;
addr <= MSR_P4_IQ_CCCR5; ++i, addr += addr_increment()) {
msrs->controls.addrs[i] = addr;
}
/* 43 ESCR registers in three or four discontiguous group */
for (addr = MSR_P4_BSU_ESCR0 + stag;
addr < MSR_P4_IQ_ESCR0; ++i, addr += addr_increment()) {
msrs->controls.addrs[i] = addr;
}
/* no IQ_ESCR0/1 on some models, we save a seconde time BSU_ESCR0/1
* to avoid special case in nmi_{save|restore}_registers() */
if (boot_cpu_data.x86_model >= 0x3) {
for (addr = MSR_P4_BSU_ESCR0 + stag;
addr <= MSR_P4_BSU_ESCR1; ++i, addr += addr_increment()) {
msrs->controls.addrs[i] = addr;
}
} else {
for (addr = MSR_P4_IQ_ESCR0 + stag;
addr <= MSR_P4_IQ_ESCR1; ++i, addr += addr_increment()) {
msrs->controls.addrs[i] = addr;
}
}
for (addr = MSR_P4_RAT_ESCR0 + stag;
addr <= MSR_P4_SSU_ESCR0; ++i, addr += addr_increment()) {
msrs->controls.addrs[i] = addr;
}
for (addr = MSR_P4_MS_ESCR0 + stag;
addr <= MSR_P4_TC_ESCR1; ++i, addr += addr_increment()) {
msrs->controls.addrs[i] = addr;
}
for (addr = MSR_P4_IX_ESCR0 + stag;
addr <= MSR_P4_CRU_ESCR3; ++i, addr += addr_increment()) {
msrs->controls.addrs[i] = addr;
}
/* there are 2 remaining non-contiguously located ESCRs */
if (num_counters == NUM_COUNTERS_NON_HT) {
/* standard non-HT CPUs handle both remaining ESCRs*/
msrs->controls.addrs[i++] = MSR_P4_CRU_ESCR5;
msrs->controls.addrs[i++] = MSR_P4_CRU_ESCR4;
} else if (stag == 0) {
/* HT CPUs give the first remainder to the even thread, as
the 32nd control register */
msrs->controls.addrs[i++] = MSR_P4_CRU_ESCR4;
} else {
/* and two copies of the second to the odd thread,
for the 22st and 23nd control registers */
msrs->controls.addrs[i++] = MSR_P4_CRU_ESCR5;
msrs->controls.addrs[i++] = MSR_P4_CRU_ESCR5;
}
}
static void pmc_setup_one_p4_counter(unsigned int ctr)
{
int i;
int const maxbind = 2;
unsigned int cccr = 0;
unsigned int escr = 0;
unsigned int high = 0;
unsigned int counter_bit;
struct p4_event_binding * ev = NULL;
unsigned int stag;
stag = get_stagger();
/* convert from counter *number* to counter *bit* */
counter_bit = 1 << VIRT_CTR(stag, ctr);
/* find our event binding structure. */
if (sysctl.ctr[ctr].event <= 0 || sysctl.ctr[ctr].event > NUM_EVENTS) {
printk(KERN_ERR
"oprofile: P4 event code 0x%x out of range\n",
sysctl.ctr[ctr].event);
return;
}
ev = &(p4_events[sysctl.ctr[ctr].event - 1]);
for (i = 0; i < maxbind; i++) {
if (ev->bindings[i].virt_counter & counter_bit) {
/* modify ESCR */
ESCR_READ(escr, high, ev, i);
ESCR_CLEAR(escr);
if (stag == 0) {
ESCR_SET_USR_0(escr, sysctl.ctr[ctr].user);
ESCR_SET_OS_0(escr, sysctl.ctr[ctr].kernel);
} else {
ESCR_SET_USR_1(escr, sysctl.ctr[ctr].user);
ESCR_SET_OS_1(escr, sysctl.ctr[ctr].kernel);
}
ESCR_SET_EVENT_SELECT(escr, ev->event_select);
ESCR_SET_EVENT_MASK(escr, sysctl.ctr[ctr].unit_mask);
ESCR_WRITE(escr, high, ev, i);
/* modify CCCR */
CCCR_READ(cccr, high, VIRT_CTR(stag, ctr));
CCCR_CLEAR(cccr);
CCCR_SET_REQUIRED_BITS(cccr);
CCCR_SET_ESCR_SELECT(cccr, ev->escr_select);
if (stag == 0) {
CCCR_SET_PMI_OVF_0(cccr);
} else {
CCCR_SET_PMI_OVF_1(cccr);
}
CCCR_WRITE(cccr, high, VIRT_CTR(stag, ctr));
return;
}
}
printk(KERN_ERR
"oprofile: P4 event code 0x%x no binding, ctr %d\n",
sysctl.ctr[ctr].event, ctr);
}
static void p4_setup_ctrs(struct op_msrs const * const msrs)
{
unsigned int i;
unsigned int low, high;
unsigned int addr;
unsigned int stag;
stag = get_stagger();
rdmsr(MSR_IA32_MISC_ENABLE, low, high);
if (!MISC_PMC_ENABLED_P(low)) {
printk(KERN_ERR "oprofile: P4 PMC not available\n");
return;
}
/* clear the cccrs we will use */
for (i = 0 ; i < num_counters ; i++) {
rdmsr(p4_counters[VIRT_CTR(stag, i)].cccr_address, low, high);
CCCR_CLEAR(low);
CCCR_SET_REQUIRED_BITS(low);
wrmsr(p4_counters[VIRT_CTR(stag, i)].cccr_address, low, high);
}
/* clear cccrs outside our concern */
for (i = stag ; i < NUM_UNUSED_CCCRS ; i += addr_increment()) {
rdmsr(p4_unused_cccr[i], low, high);
CCCR_CLEAR(low);
CCCR_SET_REQUIRED_BITS(low);
wrmsr(p4_unused_cccr[i], low, high);
}
/* clear all escrs (including those outside our concern) */
for (addr = MSR_P4_BSU_ESCR0 + stag;
addr < MSR_P4_IQ_ESCR0; addr += addr_increment()) {
wrmsr(addr, 0, 0);
}
/* On older models clear also MSR_P4_IQ_ESCR0/1 */
if (boot_cpu_data.x86_model < 0x3) {
wrmsr(MSR_P4_IQ_ESCR0, 0, 0);
wrmsr(MSR_P4_IQ_ESCR1, 0, 0);
}
for (addr = MSR_P4_RAT_ESCR0 + stag;
addr <= MSR_P4_SSU_ESCR0; ++i, addr += addr_increment()) {
wrmsr(addr, 0, 0);
}
for (addr = MSR_P4_MS_ESCR0 + stag;
addr <= MSR_P4_TC_ESCR1; addr += addr_increment()) {
wrmsr(addr, 0, 0);
}
for (addr = MSR_P4_IX_ESCR0 + stag;
addr <= MSR_P4_CRU_ESCR3; addr += addr_increment()) {
wrmsr(addr, 0, 0);
}
if (num_counters == NUM_COUNTERS_NON_HT) {
wrmsr(MSR_P4_CRU_ESCR4, 0, 0);
wrmsr(MSR_P4_CRU_ESCR5, 0, 0);
} else if (stag == 0) {
wrmsr(MSR_P4_CRU_ESCR4, 0, 0);
} else {
wrmsr(MSR_P4_CRU_ESCR5, 0, 0);
}
/* setup all counters */
for (i = 0 ; i < num_counters ; ++i) {
if (sysctl.ctr[i].event) {
pmc_setup_one_p4_counter(i);
CTR_WRITE(sysctl.ctr[i].count, VIRT_CTR(stag, i));
}
}
}
static void p4_check_ctrs(unsigned int const cpu,
struct op_msrs const * const msrs,
struct pt_regs * const regs)
{
unsigned long ctr, low, high, stag, real;
int i;
stag = get_stagger();
for (i = 0; i < num_counters; ++i) {
if (!sysctl.ctr[i].enabled)
continue;
/*
* there is some eccentricity in the hardware which
* requires that we perform 2 extra corrections:
*
* - check both the CCCR:OVF flag for overflow and the
* counter high bit for un-flagged overflows.
*
* - write the counter back twice to ensure it gets
* updated properly.
*
* the former seems to be related to extra NMIs happening
* during the current NMI; the latter is reported as errata
* N15 in intel doc 249199-029, pentium 4 specification
* update, though their suggested work-around does not
* appear to solve the problem.
*/
real = VIRT_CTR(stag, i);
CCCR_READ(low, high, real);
CTR_READ(ctr, high, real);
if (CCCR_OVF_P(low) || CTR_OVERFLOW_P(ctr)) {
op_do_profile(cpu, instruction_pointer(regs), IRQ_ENABLED(regs), i);
CTR_WRITE(oprof_data[cpu].ctr_count[i], real);
CCCR_CLEAR_OVF(low);
CCCR_WRITE(low, high, real);
CTR_WRITE(oprof_data[cpu].ctr_count[i], real);
}
}
/* P4 quirk: you have to re-unmask the apic vector */
apic_write(APIC_LVTPC, apic_read(APIC_LVTPC) & ~APIC_LVT_MASKED);
}
static void p4_start(struct op_msrs const * const msrs)
{
unsigned int low, high, stag;
int i;
stag = get_stagger();
for (i = 0; i < num_counters; ++i) {
if (!sysctl.ctr[i].enabled)
continue;
CCCR_READ(low, high, VIRT_CTR(stag, i));
CCCR_SET_ENABLE(low);
CCCR_WRITE(low, high, VIRT_CTR(stag, i));
}
}
static void p4_stop(struct op_msrs const * const msrs)
{
unsigned int low, high, stag;
int i;
stag = get_stagger();
for (i = 0; i < num_counters; ++i) {
/* FIXME: 2.6 driver doesn't do that ? */
if (!sysctl.ctr[i].enabled)
continue;
CCCR_READ(low, high, VIRT_CTR(stag, i));
CCCR_SET_DISABLE(low);
CCCR_WRITE(low, high, VIRT_CTR(stag, i));
}
}
#ifdef HT_SUPPORT
struct op_x86_model_spec const op_p4_ht2_spec = {
.num_counters = NUM_COUNTERS_HT2,
.num_controls = NUM_CONTROLS_HT2,
.fill_in_addresses = &p4_fill_in_addresses,
.setup_ctrs = &p4_setup_ctrs,
.check_ctrs = &p4_check_ctrs,
.start = &p4_start,
.stop = &p4_stop
};
#endif
struct op_x86_model_spec const op_p4_spec = {
.num_counters = NUM_COUNTERS_NON_HT,
.num_controls = NUM_CONTROLS_NON_HT,
.fill_in_addresses = &p4_fill_in_addresses,
.setup_ctrs = &p4_setup_ctrs,
.check_ctrs = &p4_check_ctrs,
.start = &p4_start,
.stop = &p4_stop
};