dect
/
linux-2.6
Archived
13
0
Fork 0
Code Releases Activity

MIPS: oprofile: Support for XLR/XLS processors 

Add support for XLR and XLS processors in MIPS Oprofile code. These
processors are multi-threaded and have two counters per core. Each
counter can track either all the events in the core (global mode),
or events in just one thread.

We use the counters in the global mode, and use only the first thread
in each core to handle the configuration etc.

Signed-off-by: Madhusudan Bhat <mbhat@netlogicmicro.com>
Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Patchwork: http://patchwork.linux-mips.org/patch/4471
Signed-off-by: John Crispin <blogic@openwrt.org>
This commit is contained in:
Madhusudan Bhat 2012-10-31 12:01:27 +00:00 committed by John Crispin
parent e7e333cb22
commit c783390a0e
3 changed files with 31 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/mips/oprofile/Makefile
View File

@ -12,5 +12,6 @@ oprofile-$(CONFIG_CPU_MIPS32) += op_model_mipsxx.o
oprofile-$(CONFIG_CPU_MIPS64) += op_model_mipsxx.o
oprofile-$(CONFIG_CPU_R10000) += op_model_mipsxx.o
oprofile-$(CONFIG_CPU_SB1) += op_model_mipsxx.o
oprofile-$(CONFIG_CPU_XLR) += op_model_mipsxx.o
oprofile-$(CONFIG_CPU_RM9000) += op_model_rm9000.o
oprofile-$(CONFIG_CPU_LOONGSON2) += op_model_loongson2.o

1
arch/mips/oprofile/common.c
View File

@ -91,6 +91,7 @@ int __init oprofile_arch_init(struct oprofile_operations *ops)
case CPU_R10000:
case CPU_R12000:
case CPU_R14000:
case CPU_XLR:
lmodel = &op_model_mipsxx_ops;
break;

29
arch/mips/oprofile/op_model_mipsxx.c
View File

@ -31,8 +31,22 @@
#define M_COUNTER_OVERFLOW (1UL << 31)
/* Netlogic XLR specific, count events in all threads in a core */
#define M_PERFCTL_COUNT_ALL_THREADS (1UL << 13)
static int (*save_perf_irq)(void);
/*
* XLR has only one set of counters per core. Designate the
* first hardware thread in the core for setup and init.
* Skip CPUs with non-zero hardware thread id (4 hwt per core)
*/
#ifdef CONFIG_CPU_XLR
#define oprofile_skip_cpu(c) ((cpu_logical_map(c) & 0x3) != 0)
#else
#define oprofile_skip_cpu(c) 0
#endif
#ifdef CONFIG_MIPS_MT_SMP
static int cpu_has_mipsmt_pertccounters;
#define WHAT (M_TC_EN_VPE | \
@ -152,6 +166,8 @@ static void mipsxx_reg_setup(struct op_counter_config *ctr)
reg.control[i] |= M_PERFCTL_USER;
if (ctr[i].exl)
reg.control[i] |= M_PERFCTL_EXL;
if (current_cpu_type() == CPU_XLR)
reg.control[i] |= M_PERFCTL_COUNT_ALL_THREADS;
reg.counter[i] = 0x80000000 - ctr[i].count;
}
}
@ -162,6 +178,9 @@ static void mipsxx_cpu_setup(void *args)
{
unsigned int counters = op_model_mipsxx_ops.num_counters;
if (oprofile_skip_cpu(smp_processor_id()))
return;
switch (counters) {
case 4:
w_c0_perfctrl3(0);
@ -183,6 +202,9 @@ static void mipsxx_cpu_start(void *args)
{
unsigned int counters = op_model_mipsxx_ops.num_counters;
if (oprofile_skip_cpu(smp_processor_id()))
return;
switch (counters) {
case 4:
w_c0_perfctrl3(WHAT | reg.control[3]);
@ -200,6 +222,9 @@ static void mipsxx_cpu_stop(void *args)
{
unsigned int counters = op_model_mipsxx_ops.num_counters;
if (oprofile_skip_cpu(smp_processor_id()))
return;
switch (counters) {
case 4:
w_c0_perfctrl3(0);
@ -372,6 +397,10 @@ static int __init mipsxx_init(void)
op_model_mipsxx_ops.cpu_type = "mips/loongson1";
break;
case CPU_XLR:
op_model_mipsxx_ops.cpu_type = "mips/xlr";
break;
default:
printk(KERN_ERR "Profiling unsupported for this CPU\n");