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-rw-r--r--arch/x86/oprofile/op_model_amd.c542
1 files changed, 0 insertions, 542 deletions
diff --git a/arch/x86/oprofile/op_model_amd.c b/arch/x86/oprofile/op_model_amd.c
deleted file mode 100644
index 660a83c8287b..000000000000
--- a/arch/x86/oprofile/op_model_amd.c
+++ /dev/null
@@ -1,542 +0,0 @@
-/*
- * @file op_model_amd.c
- * athlon / K7 / K8 / Family 10h model-specific MSR operations
- *
- * @remark Copyright 2002-2009 OProfile authors
- * @remark Read the file COPYING
- *
- * @author John Levon
- * @author Philippe Elie
- * @author Graydon Hoare
- * @author Robert Richter <robert.richter@amd.com>
- * @author Barry Kasindorf <barry.kasindorf@amd.com>
- * @author Jason Yeh <jason.yeh@amd.com>
- * @author Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
- */
-
-#include <linux/oprofile.h>
-#include <linux/device.h>
-#include <linux/pci.h>
-#include <linux/percpu.h>
-
-#include <asm/ptrace.h>
-#include <asm/msr.h>
-#include <asm/nmi.h>
-#include <asm/apic.h>
-#include <asm/processor.h>
-
-#include "op_x86_model.h"
-#include "op_counter.h"
-
-#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
-#define NUM_VIRT_COUNTERS 32
-#else
-#define NUM_VIRT_COUNTERS 0
-#endif
-
-#define OP_EVENT_MASK 0x0FFF
-#define OP_CTR_OVERFLOW (1ULL<<31)
-
-#define MSR_AMD_EVENTSEL_RESERVED ((0xFFFFFCF0ULL<<32)|(1ULL<<21))
-
-static int num_counters;
-static unsigned long reset_value[OP_MAX_COUNTER];
-
-#define IBS_FETCH_SIZE 6
-#define IBS_OP_SIZE 12
-
-static u32 ibs_caps;
-
-struct ibs_config {
- unsigned long op_enabled;
- unsigned long fetch_enabled;
- unsigned long max_cnt_fetch;
- unsigned long max_cnt_op;
- unsigned long rand_en;
- unsigned long dispatched_ops;
- unsigned long branch_target;
-};
-
-struct ibs_state {
- u64 ibs_op_ctl;
- int branch_target;
- unsigned long sample_size;
-};
-
-static struct ibs_config ibs_config;
-static struct ibs_state ibs_state;
-
-/*
- * IBS randomization macros
- */
-#define IBS_RANDOM_BITS 12
-#define IBS_RANDOM_MASK ((1ULL << IBS_RANDOM_BITS) - 1)
-#define IBS_RANDOM_MAXCNT_OFFSET (1ULL << (IBS_RANDOM_BITS - 5))
-
-/*
- * 16-bit Linear Feedback Shift Register (LFSR)
- *
- * 16 14 13 11
- * Feedback polynomial = X + X + X + X + 1
- */
-static unsigned int lfsr_random(void)
-{
- static unsigned int lfsr_value = 0xF00D;
- unsigned int bit;
-
- /* Compute next bit to shift in */
- bit = ((lfsr_value >> 0) ^
- (lfsr_value >> 2) ^
- (lfsr_value >> 3) ^
- (lfsr_value >> 5)) & 0x0001;
-
- /* Advance to next register value */
- lfsr_value = (lfsr_value >> 1) | (bit << 15);
-
- return lfsr_value;
-}
-
-/*
- * IBS software randomization
- *
- * The IBS periodic op counter is randomized in software. The lower 12
- * bits of the 20 bit counter are randomized. IbsOpCurCnt is
- * initialized with a 12 bit random value.
- */
-static inline u64 op_amd_randomize_ibs_op(u64 val)
-{
- unsigned int random = lfsr_random();
-
- if (!(ibs_caps & IBS_CAPS_RDWROPCNT))
- /*
- * Work around if the hw can not write to IbsOpCurCnt
- *
- * Randomize the lower 8 bits of the 16 bit
- * IbsOpMaxCnt [15:0] value in the range of -128 to
- * +127 by adding/subtracting an offset to the
- * maximum count (IbsOpMaxCnt).
- *
- * To avoid over or underflows and protect upper bits
- * starting at bit 16, the initial value for
- * IbsOpMaxCnt must fit in the range from 0x0081 to
- * 0xff80.
- */
- val += (s8)(random >> 4);
- else
- val |= (u64)(random & IBS_RANDOM_MASK) << 32;
-
- return val;
-}
-
-static inline void
-op_amd_handle_ibs(struct pt_regs * const regs,
- struct op_msrs const * const msrs)
-{
- u64 val, ctl;
- struct op_entry entry;
-
- if (!ibs_caps)
- return;
-
- if (ibs_config.fetch_enabled) {
- rdmsrl(MSR_AMD64_IBSFETCHCTL, ctl);
- if (ctl & IBS_FETCH_VAL) {
- rdmsrl(MSR_AMD64_IBSFETCHLINAD, val);
- oprofile_write_reserve(&entry, regs, val,
- IBS_FETCH_CODE, IBS_FETCH_SIZE);
- oprofile_add_data64(&entry, val);
- oprofile_add_data64(&entry, ctl);
- rdmsrl(MSR_AMD64_IBSFETCHPHYSAD, val);
- oprofile_add_data64(&entry, val);
- oprofile_write_commit(&entry);
-
- /* reenable the IRQ */
- ctl &= ~(IBS_FETCH_VAL | IBS_FETCH_CNT);
- ctl |= IBS_FETCH_ENABLE;
- wrmsrl(MSR_AMD64_IBSFETCHCTL, ctl);
- }
- }
-
- if (ibs_config.op_enabled) {
- rdmsrl(MSR_AMD64_IBSOPCTL, ctl);
- if (ctl & IBS_OP_VAL) {
- rdmsrl(MSR_AMD64_IBSOPRIP, val);
- oprofile_write_reserve(&entry, regs, val, IBS_OP_CODE,
- ibs_state.sample_size);
- oprofile_add_data64(&entry, val);
- rdmsrl(MSR_AMD64_IBSOPDATA, val);
- oprofile_add_data64(&entry, val);
- rdmsrl(MSR_AMD64_IBSOPDATA2, val);
- oprofile_add_data64(&entry, val);
- rdmsrl(MSR_AMD64_IBSOPDATA3, val);
- oprofile_add_data64(&entry, val);
- rdmsrl(MSR_AMD64_IBSDCLINAD, val);
- oprofile_add_data64(&entry, val);
- rdmsrl(MSR_AMD64_IBSDCPHYSAD, val);
- oprofile_add_data64(&entry, val);
- if (ibs_state.branch_target) {
- rdmsrl(MSR_AMD64_IBSBRTARGET, val);
- oprofile_add_data(&entry, (unsigned long)val);
- }
- oprofile_write_commit(&entry);
-
- /* reenable the IRQ */
- ctl = op_amd_randomize_ibs_op(ibs_state.ibs_op_ctl);
- wrmsrl(MSR_AMD64_IBSOPCTL, ctl);
- }
- }
-}
-
-static inline void op_amd_start_ibs(void)
-{
- u64 val;
-
- if (!ibs_caps)
- return;
-
- memset(&ibs_state, 0, sizeof(ibs_state));
-
- /*
- * Note: Since the max count settings may out of range we
- * write back the actual used values so that userland can read
- * it.
- */
-
- if (ibs_config.fetch_enabled) {
- val = ibs_config.max_cnt_fetch >> 4;
- val = min(val, IBS_FETCH_MAX_CNT);
- ibs_config.max_cnt_fetch = val << 4;
- val |= ibs_config.rand_en ? IBS_FETCH_RAND_EN : 0;
- val |= IBS_FETCH_ENABLE;
- wrmsrl(MSR_AMD64_IBSFETCHCTL, val);
- }
-
- if (ibs_config.op_enabled) {
- val = ibs_config.max_cnt_op >> 4;
- if (!(ibs_caps & IBS_CAPS_RDWROPCNT)) {
- /*
- * IbsOpCurCnt not supported. See
- * op_amd_randomize_ibs_op() for details.
- */
- val = clamp(val, 0x0081ULL, 0xFF80ULL);
- ibs_config.max_cnt_op = val << 4;
- } else {
- /*
- * The start value is randomized with a
- * positive offset, we need to compensate it
- * with the half of the randomized range. Also
- * avoid underflows.
- */
- val += IBS_RANDOM_MAXCNT_OFFSET;
- if (ibs_caps & IBS_CAPS_OPCNTEXT)
- val = min(val, IBS_OP_MAX_CNT_EXT);
- else
- val = min(val, IBS_OP_MAX_CNT);
- ibs_config.max_cnt_op =
- (val - IBS_RANDOM_MAXCNT_OFFSET) << 4;
- }
- val = ((val & ~IBS_OP_MAX_CNT) << 4) | (val & IBS_OP_MAX_CNT);
- val |= ibs_config.dispatched_ops ? IBS_OP_CNT_CTL : 0;
- val |= IBS_OP_ENABLE;
- ibs_state.ibs_op_ctl = val;
- ibs_state.sample_size = IBS_OP_SIZE;
- if (ibs_config.branch_target) {
- ibs_state.branch_target = 1;
- ibs_state.sample_size++;
- }
- val = op_amd_randomize_ibs_op(ibs_state.ibs_op_ctl);
- wrmsrl(MSR_AMD64_IBSOPCTL, val);
- }
-}
-
-static void op_amd_stop_ibs(void)
-{
- if (!ibs_caps)
- return;
-
- if (ibs_config.fetch_enabled)
- /* clear max count and enable */
- wrmsrl(MSR_AMD64_IBSFETCHCTL, 0);
-
- if (ibs_config.op_enabled)
- /* clear max count and enable */
- wrmsrl(MSR_AMD64_IBSOPCTL, 0);
-}
-
-#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
-
-static void op_mux_switch_ctrl(struct op_x86_model_spec const *model,
- struct op_msrs const * const msrs)
-{
- u64 val;
- int i;
-
- /* enable active counters */
- for (i = 0; i < num_counters; ++i) {
- int virt = op_x86_phys_to_virt(i);
- if (!reset_value[virt])
- continue;
- rdmsrl(msrs->controls[i].addr, val);
- val &= model->reserved;
- val |= op_x86_get_ctrl(model, &counter_config[virt]);
- wrmsrl(msrs->controls[i].addr, val);
- }
-}
-
-#endif
-
-/* functions for op_amd_spec */
-
-static void op_amd_shutdown(struct op_msrs const * const msrs)
-{
- int i;
-
- for (i = 0; i < num_counters; ++i) {
- if (!msrs->counters[i].addr)
- continue;
- release_perfctr_nmi(MSR_K7_PERFCTR0 + i);
- release_evntsel_nmi(MSR_K7_EVNTSEL0 + i);
- }
-}
-
-static int op_amd_fill_in_addresses(struct op_msrs * const msrs)
-{
- int i;
-
- for (i = 0; i < num_counters; i++) {
- if (!reserve_perfctr_nmi(MSR_K7_PERFCTR0 + i))
- goto fail;
- if (!reserve_evntsel_nmi(MSR_K7_EVNTSEL0 + i)) {
- release_perfctr_nmi(MSR_K7_PERFCTR0 + i);
- goto fail;
- }
- /* both registers must be reserved */
- if (num_counters == AMD64_NUM_COUNTERS_CORE) {
- msrs->counters[i].addr = MSR_F15H_PERF_CTR + (i << 1);
- msrs->controls[i].addr = MSR_F15H_PERF_CTL + (i << 1);
- } else {
- msrs->controls[i].addr = MSR_K7_EVNTSEL0 + i;
- msrs->counters[i].addr = MSR_K7_PERFCTR0 + i;
- }
- continue;
- fail:
- if (!counter_config[i].enabled)
- continue;
- op_x86_warn_reserved(i);
- op_amd_shutdown(msrs);
- return -EBUSY;
- }
-
- return 0;
-}
-
-static void op_amd_setup_ctrs(struct op_x86_model_spec const *model,
- struct op_msrs const * const msrs)
-{
- u64 val;
- int i;
-
- /* setup reset_value */
- for (i = 0; i < OP_MAX_COUNTER; ++i) {
- if (counter_config[i].enabled
- && msrs->counters[op_x86_virt_to_phys(i)].addr)
- reset_value[i] = counter_config[i].count;
- else
- reset_value[i] = 0;
- }
-
- /* clear all counters */
- for (i = 0; i < num_counters; ++i) {
- if (!msrs->controls[i].addr)
- continue;
- rdmsrl(msrs->controls[i].addr, val);
- if (val & ARCH_PERFMON_EVENTSEL_ENABLE)
- op_x86_warn_in_use(i);
- val &= model->reserved;
- wrmsrl(msrs->controls[i].addr, val);
- /*
- * avoid a false detection of ctr overflows in NMI
- * handler
- */
- wrmsrl(msrs->counters[i].addr, -1LL);
- }
-
- /* enable active counters */
- for (i = 0; i < num_counters; ++i) {
- int virt = op_x86_phys_to_virt(i);
- if (!reset_value[virt])
- continue;
-
- /* setup counter registers */
- wrmsrl(msrs->counters[i].addr, -(u64)reset_value[virt]);
-
- /* setup control registers */
- rdmsrl(msrs->controls[i].addr, val);
- val &= model->reserved;
- val |= op_x86_get_ctrl(model, &counter_config[virt]);
- wrmsrl(msrs->controls[i].addr, val);
- }
-}
-
-static int op_amd_check_ctrs(struct pt_regs * const regs,
- struct op_msrs const * const msrs)
-{
- u64 val;
- int i;
-
- for (i = 0; i < num_counters; ++i) {
- int virt = op_x86_phys_to_virt(i);
- if (!reset_value[virt])
- continue;
- rdmsrl(msrs->counters[i].addr, val);
- /* bit is clear if overflowed: */
- if (val & OP_CTR_OVERFLOW)
- continue;
- oprofile_add_sample(regs, virt);
- wrmsrl(msrs->counters[i].addr, -(u64)reset_value[virt]);
- }
-
- op_amd_handle_ibs(regs, msrs);
-
- /* See op_model_ppro.c */
- return 1;
-}
-
-static void op_amd_start(struct op_msrs const * const msrs)
-{
- u64 val;
- int i;
-
- for (i = 0; i < num_counters; ++i) {
- if (!reset_value[op_x86_phys_to_virt(i)])
- continue;
- rdmsrl(msrs->controls[i].addr, val);
- val |= ARCH_PERFMON_EVENTSEL_ENABLE;
- wrmsrl(msrs->controls[i].addr, val);
- }
-
- op_amd_start_ibs();
-}
-
-static void op_amd_stop(struct op_msrs const * const msrs)
-{
- u64 val;
- int i;
-
- /*
- * Subtle: stop on all counters to avoid race with setting our
- * pm callback
- */
- for (i = 0; i < num_counters; ++i) {
- if (!reset_value[op_x86_phys_to_virt(i)])
- continue;
- rdmsrl(msrs->controls[i].addr, val);
- val &= ~ARCH_PERFMON_EVENTSEL_ENABLE;
- wrmsrl(msrs->controls[i].addr, val);
- }
-
- op_amd_stop_ibs();
-}
-
-/*
- * check and reserve APIC extended interrupt LVT offset for IBS if
- * available
- */
-
-static void init_ibs(void)
-{
- ibs_caps = get_ibs_caps();
-
- if (!ibs_caps)
- return;
-
- printk(KERN_INFO "oprofile: AMD IBS detected (0x%08x)\n", ibs_caps);
-}
-
-static int (*create_arch_files)(struct dentry *root);
-
-static int setup_ibs_files(struct dentry *root)
-{
- struct dentry *dir;
- int ret = 0;
-
- /* architecture specific files */
- if (create_arch_files)
- ret = create_arch_files(root);
-
- if (ret)
- return ret;
-
- if (!ibs_caps)
- return ret;
-
- /* model specific files */
-
- /* setup some reasonable defaults */
- memset(&ibs_config, 0, sizeof(ibs_config));
- ibs_config.max_cnt_fetch = 250000;
- ibs_config.max_cnt_op = 250000;
-
- if (ibs_caps & IBS_CAPS_FETCHSAM) {
- dir = oprofilefs_mkdir(root, "ibs_fetch");
- oprofilefs_create_ulong(dir, "enable",
- &ibs_config.fetch_enabled);
- oprofilefs_create_ulong(dir, "max_count",
- &ibs_config.max_cnt_fetch);
- oprofilefs_create_ulong(dir, "rand_enable",
- &ibs_config.rand_en);
- }
-
- if (ibs_caps & IBS_CAPS_OPSAM) {
- dir = oprofilefs_mkdir(root, "ibs_op");
- oprofilefs_create_ulong(dir, "enable",
- &ibs_config.op_enabled);
- oprofilefs_create_ulong(dir, "max_count",
- &ibs_config.max_cnt_op);
- if (ibs_caps & IBS_CAPS_OPCNT)
- oprofilefs_create_ulong(dir, "dispatched_ops",
- &ibs_config.dispatched_ops);
- if (ibs_caps & IBS_CAPS_BRNTRGT)
- oprofilefs_create_ulong(dir, "branch_target",
- &ibs_config.branch_target);
- }
-
- return 0;
-}
-
-struct op_x86_model_spec op_amd_spec;
-
-static int op_amd_init(struct oprofile_operations *ops)
-{
- init_ibs();
- create_arch_files = ops->create_files;
- ops->create_files = setup_ibs_files;
-
- if (boot_cpu_data.x86 == 0x15) {
- num_counters = AMD64_NUM_COUNTERS_CORE;
- } else {
- num_counters = AMD64_NUM_COUNTERS;
- }
-
- op_amd_spec.num_counters = num_counters;
- op_amd_spec.num_controls = num_counters;
- op_amd_spec.num_virt_counters = max(num_counters, NUM_VIRT_COUNTERS);
-
- return 0;
-}
-
-struct op_x86_model_spec op_amd_spec = {
- /* num_counters/num_controls filled in at runtime */
- .reserved = MSR_AMD_EVENTSEL_RESERVED,
- .event_mask = OP_EVENT_MASK,
- .init = op_amd_init,
- .fill_in_addresses = &op_amd_fill_in_addresses,
- .setup_ctrs = &op_amd_setup_ctrs,
- .check_ctrs = &op_amd_check_ctrs,
- .start = &op_amd_start,
- .stop = &op_amd_stop,
- .shutdown = &op_amd_shutdown,
-#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
- .switch_ctrl = &op_mux_switch_ctrl,
-#endif
-};
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.