MIPS: add support for software performance events
Software events are required as part of the measurable stuff by the
Linux performance counter subsystem. Here is the list of events added by
this patch:
PERF_COUNT_SW_PAGE_FAULTS
PERF_COUNT_SW_PAGE_FAULTS_MIN
PERF_COUNT_SW_PAGE_FAULTS_MAJ
PERF_COUNT_SW_ALIGNMENT_FAULTS
PERF_COUNT_SW_EMULATION_FAULTS
Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
To: linux-mips@linux-mips.org
Cc: a.p.zijlstra@chello.nl
Cc: paulus@samba.org
Cc: mingo@elte.hu
Cc: acme@redhat.com
Cc: jamie.iles@picochip.com
Acked-by: David Daney <ddaney@caviumnetworks.com>
Reviewed-by: Matt Fleming <matt@console-pimps.org>
Patchwork: https://patchwork.linux-mips.org/patch/1686/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 8fbbef9..dc81f39 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -4,6 +4,8 @@
select HAVE_GENERIC_DMA_COHERENT
select HAVE_IDE
select HAVE_OPROFILE
+ select HAVE_PERF_EVENTS
+ select PERF_USE_VMALLOC
select HAVE_ARCH_KGDB
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_TRACE_MCOUNT_TEST
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index d053bf4..8d79b87 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -29,6 +29,7 @@
#include <linux/notifier.h>
#include <linux/kdb.h>
#include <linux/irq.h>
+#include <linux/perf_event.h>
#include <asm/bootinfo.h>
#include <asm/branch.h>
@@ -576,10 +577,16 @@
*/
static int simulate_llsc(struct pt_regs *regs, unsigned int opcode)
{
- if ((opcode & OPCODE) == LL)
+ if ((opcode & OPCODE) == LL) {
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+ 1, 0, regs, 0);
return simulate_ll(regs, opcode);
- if ((opcode & OPCODE) == SC)
+ }
+ if ((opcode & OPCODE) == SC) {
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+ 1, 0, regs, 0);
return simulate_sc(regs, opcode);
+ }
return -1; /* Must be something else ... */
}
@@ -595,6 +602,8 @@
if ((opcode & OPCODE) == SPEC3 && (opcode & FUNC) == RDHWR) {
int rd = (opcode & RD) >> 11;
int rt = (opcode & RT) >> 16;
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+ 1, 0, regs, 0);
switch (rd) {
case 0: /* CPU number */
regs->regs[rt] = smp_processor_id();
@@ -630,8 +639,11 @@
static int simulate_sync(struct pt_regs *regs, unsigned int opcode)
{
- if ((opcode & OPCODE) == SPEC0 && (opcode & FUNC) == SYNC)
+ if ((opcode & OPCODE) == SPEC0 && (opcode & FUNC) == SYNC) {
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+ 1, 0, regs, 0);
return 0;
+ }
return -1; /* Must be something else ... */
}
diff --git a/arch/mips/kernel/unaligned.c b/arch/mips/kernel/unaligned.c
index 33d5a5c..cfea1ad 100644
--- a/arch/mips/kernel/unaligned.c
+++ b/arch/mips/kernel/unaligned.c
@@ -78,6 +78,8 @@
#include <linux/smp.h>
#include <linux/sched.h>
#include <linux/debugfs.h>
+#include <linux/perf_event.h>
+
#include <asm/asm.h>
#include <asm/branch.h>
#include <asm/byteorder.h>
@@ -109,6 +111,9 @@
unsigned long value;
unsigned int res;
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+ 1, 0, regs, 0);
+
/*
* This load never faults.
*/
@@ -511,6 +516,8 @@
unsigned int __user *pc;
mm_segment_t seg;
+ perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS,
+ 1, 0, regs, regs->cp0_badvaddr);
/*
* Did we catch a fault trying to load an instruction?
* Or are we running in MIPS16 mode?
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
index ec3faa4..b2ad1b0 100644
--- a/arch/mips/math-emu/cp1emu.c
+++ b/arch/mips/math-emu/cp1emu.c
@@ -36,6 +36,7 @@
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/debugfs.h>
+#include <linux/perf_event.h>
#include <asm/inst.h>
#include <asm/bootinfo.h>
@@ -258,6 +259,8 @@
}
emul:
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+ 1, 0, xcp, 0);
MIPS_FPU_EMU_INC_STATS(emulated);
switch (MIPSInst_OPCODE(ir)) {
case ldc1_op:{
diff --git a/arch/mips/mm/fault.c b/arch/mips/mm/fault.c
index 783ad00..137ee76 100644
--- a/arch/mips/mm/fault.c
+++ b/arch/mips/mm/fault.c
@@ -18,6 +18,7 @@
#include <linux/smp.h>
#include <linux/module.h>
#include <linux/kprobes.h>
+#include <linux/perf_event.h>
#include <asm/branch.h>
#include <asm/mmu_context.h>
@@ -144,6 +145,7 @@
* the fault.
*/
fault = handle_mm_fault(mm, vma, address, write ? FAULT_FLAG_WRITE : 0);
+ perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, 0, regs, address);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
@@ -151,10 +153,15 @@
goto do_sigbus;
BUG();
}
- if (fault & VM_FAULT_MAJOR)
+ if (fault & VM_FAULT_MAJOR) {
+ perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ,
+ 1, 0, regs, address);
tsk->maj_flt++;
- else
+ } else {
+ perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN,
+ 1, 0, regs, address);
tsk->min_flt++;
+ }
up_read(&mm->mmap_sem);
return;