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-rw-r--r--arch/x86/oprofile/op_model_p4.c722
1 files changed, 722 insertions, 0 deletions
diff --git a/arch/x86/oprofile/op_model_p4.c b/arch/x86/oprofile/op_model_p4.c
new file mode 100644
index 00000000000..47925927b12
--- /dev/null
+++ b/arch/x86/oprofile/op_model_p4.c
@@ -0,0 +1,722 @@
+/**
+ * @file op_model_p4.c
+ * P4 model-specific MSR operations
+ *
+ * @remark Copyright 2002 OProfile authors
+ * @remark Read the file COPYING
+ *
+ * @author Graydon Hoare
+ */
+
+#include <linux/oprofile.h>
+#include <linux/smp.h>
+#include <asm/msr.h>
+#include <asm/ptrace.h>
+#include <asm/fixmap.h>
+#include <asm/apic.h>
+#include <asm/nmi.h>
+
+#include "op_x86_model.h"
+#include "op_counter.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;
+static unsigned int num_controls = NUM_CONTROLS_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 CONFIG_SMP
+ if (smp_num_siblings == 2){
+ num_counters = NUM_COUNTERS_HT2;
+ num_controls = NUM_CONTROLS_HT2;
+ }
+#endif
+}
+
+static int inline addr_increment(void)
+{
+#ifdef CONFIG_SMP
+ 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 {
+ int escr_select; /* value to put in CCCR */
+ int event_select; /* value to put in ESCR */
+ struct {
+ int virt_counter; /* for this counter... */
+ int escr_address; /* use this ESCR */
+ } 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
+
+/* 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} }
+ },
+
+ { /* 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,
+ { { CTR_BPU_2, MSR_P4_BSU_ESCR1 /* guess */},
+ { 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 CTRL_IS_RESERVED(msrs,c) (msrs->controls[(c)].addr ? 1 : 0)
+#define CTR_IS_RESERVED(msrs,c) (msrs->counters[(c)].addr ? 1 : 0)
+#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 CONFIG_SMP
+ int cpu = smp_processor_id();
+ return (cpu != first_cpu(cpu_sibling_map[cpu]));
+#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 unsigned long reset_value[NUM_COUNTERS_NON_HT];
+
+
+static void p4_fill_in_addresses(struct op_msrs * const msrs)
+{
+ unsigned int i;
+ unsigned int addr, cccraddr, stag;
+
+ setup_num_counters();
+ stag = get_stagger();
+
+ /* initialize some registers */
+ for (i = 0; i < num_counters; ++i) {
+ msrs->counters[i].addr = 0;
+ }
+ for (i = 0; i < num_controls; ++i) {
+ msrs->controls[i].addr = 0;
+ }
+
+ /* the counter & cccr registers we pay attention to */
+ for (i = 0; i < num_counters; ++i) {
+ addr = p4_counters[VIRT_CTR(stag, i)].counter_address;
+ cccraddr = p4_counters[VIRT_CTR(stag, i)].cccr_address;
+ if (reserve_perfctr_nmi(addr)){
+ msrs->counters[i].addr = addr;
+ msrs->controls[i].addr = cccraddr;
+ }
+ }
+
+ /* 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()) {
+ if (reserve_evntsel_nmi(addr))
+ msrs->controls[i].addr = 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()) {
+ if (reserve_evntsel_nmi(addr))
+ msrs->controls[i].addr = addr;
+ }
+ } else {
+ for (addr = MSR_P4_IQ_ESCR0 + stag;
+ addr <= MSR_P4_IQ_ESCR1; ++i, addr += addr_increment()) {
+ if (reserve_evntsel_nmi(addr))
+ msrs->controls[i].addr = addr;
+ }
+ }
+
+ for (addr = MSR_P4_RAT_ESCR0 + stag;
+ addr <= MSR_P4_SSU_ESCR0; ++i, addr += addr_increment()) {
+ if (reserve_evntsel_nmi(addr))
+ msrs->controls[i].addr = addr;
+ }
+
+ for (addr = MSR_P4_MS_ESCR0 + stag;
+ addr <= MSR_P4_TC_ESCR1; ++i, addr += addr_increment()) {
+ if (reserve_evntsel_nmi(addr))
+ msrs->controls[i].addr = addr;
+ }
+
+ for (addr = MSR_P4_IX_ESCR0 + stag;
+ addr <= MSR_P4_CRU_ESCR3; ++i, addr += addr_increment()) {
+ if (reserve_evntsel_nmi(addr))
+ msrs->controls[i].addr = addr;
+ }
+
+ /* there are 2 remaining non-contiguously located ESCRs */
+
+ if (num_counters == NUM_COUNTERS_NON_HT) {
+ /* standard non-HT CPUs handle both remaining ESCRs*/
+ if (reserve_evntsel_nmi(MSR_P4_CRU_ESCR5))
+ msrs->controls[i++].addr = MSR_P4_CRU_ESCR5;
+ if (reserve_evntsel_nmi(MSR_P4_CRU_ESCR4))
+ msrs->controls[i++].addr = MSR_P4_CRU_ESCR4;
+
+ } else if (stag == 0) {
+ /* HT CPUs give the first remainder to the even thread, as
+ the 32nd control register */
+ if (reserve_evntsel_nmi(MSR_P4_CRU_ESCR4))
+ msrs->controls[i++].addr = MSR_P4_CRU_ESCR4;
+
+ } else {
+ /* and two copies of the second to the odd thread,
+ for the 22st and 23nd control registers */
+ if (reserve_evntsel_nmi(MSR_P4_CRU_ESCR5)) {
+ msrs->controls[i++].addr = MSR_P4_CRU_ESCR5;
+ msrs->controls[i++].addr = 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 (counter_config[ctr].event <= 0 || counter_config[ctr].event > NUM_EVENTS) {
+ printk(KERN_ERR
+ "oprofile: P4 event code 0x%lx out of range\n",
+ counter_config[ctr].event);
+ return;
+ }
+
+ ev = &(p4_events[counter_config[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, counter_config[ctr].user);
+ ESCR_SET_OS_0(escr, counter_config[ctr].kernel);
+ } else {
+ ESCR_SET_USR_1(escr, counter_config[ctr].user);
+ ESCR_SET_OS_1(escr, counter_config[ctr].kernel);
+ }
+ ESCR_SET_EVENT_SELECT(escr, ev->event_select);
+ ESCR_SET_EVENT_MASK(escr, counter_config[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%lx no binding, stag %d ctr %d\n",
+ counter_config[ctr].event, stag, ctr);
+}
+
+
+static void p4_setup_ctrs(struct op_msrs const * const msrs)
+{
+ unsigned int i;
+ unsigned int low, high;
+ 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++) {
+ if (unlikely(!CTRL_IS_RESERVED(msrs,i)))
+ continue;
+ 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 all escrs (including those outside our concern) */
+ for (i = num_counters; i < num_controls; i++) {
+ if (unlikely(!CTRL_IS_RESERVED(msrs,i)))
+ continue;
+ wrmsr(msrs->controls[i].addr, 0, 0);
+ }
+
+ /* setup all counters */
+ for (i = 0 ; i < num_counters ; ++i) {
+ if ((counter_config[i].enabled) && (CTRL_IS_RESERVED(msrs,i))) {
+ reset_value[i] = counter_config[i].count;
+ pmc_setup_one_p4_counter(i);
+ CTR_WRITE(counter_config[i].count, VIRT_CTR(stag, i));
+ } else {
+ reset_value[i] = 0;
+ }
+ }
+}
+
+
+static int p4_check_ctrs(struct pt_regs * const regs,
+ struct op_msrs const * const msrs)
+{
+ unsigned long ctr, low, high, stag, real;
+ int i;
+
+ stag = get_stagger();
+
+ for (i = 0; i < num_counters; ++i) {
+
+ if (!reset_value[i])
+ 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)) {
+ oprofile_add_sample(regs, i);
+ CTR_WRITE(reset_value[i], real);
+ CCCR_CLEAR_OVF(low);
+ CCCR_WRITE(low, high, real);
+ CTR_WRITE(reset_value[i], real);
+ }
+ }
+
+ /* P4 quirk: you have to re-unmask the apic vector */
+ apic_write(APIC_LVTPC, apic_read(APIC_LVTPC) & ~APIC_LVT_MASKED);
+
+ /* See op_model_ppro.c */
+ return 1;
+}
+
+
+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 (!reset_value[i])
+ 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) {
+ if (!reset_value[i])
+ continue;
+ CCCR_READ(low, high, VIRT_CTR(stag, i));
+ CCCR_SET_DISABLE(low);
+ CCCR_WRITE(low, high, VIRT_CTR(stag, i));
+ }
+}
+
+static void p4_shutdown(struct op_msrs const * const msrs)
+{
+ int i;
+
+ for (i = 0 ; i < num_counters ; ++i) {
+ if (CTR_IS_RESERVED(msrs,i))
+ release_perfctr_nmi(msrs->counters[i].addr);
+ }
+ /* some of the control registers are specially reserved in
+ * conjunction with the counter registers (hence the starting offset).
+ * This saves a few bits.
+ */
+ for (i = num_counters ; i < num_controls ; ++i) {
+ if (CTRL_IS_RESERVED(msrs,i))
+ release_evntsel_nmi(msrs->controls[i].addr);
+ }
+}
+
+
+#ifdef CONFIG_SMP
+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,
+ .shutdown = &p4_shutdown
+};
+#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,
+ .shutdown = &p4_shutdown
+};
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-02 08:30:14 +0000