summaryrefslogtreecommitdiffstats
path: root/arch
diff options
context:
space:
mode:
authorMadhusudan Bhat <mbhat@netlogicmicro.com>2012-10-31 12:01:27 +0000
committerJohn Crispin <blogic@openwrt.org>2012-11-09 11:37:18 +0100
commitc783390a0ecef08df5c804f8c5f647431a04f502 (patch)
tree31108a6fe38ac9f7ba0e101ee1f2c5f51068f955 /arch
parente7e333cb22e5e34e7a0792f262df52026815662e (diff)
downloadlinux-c783390a0ecef08df5c804f8c5f647431a04f502.tar.gz
linux-c783390a0ecef08df5c804f8c5f647431a04f502.tar.bz2
linux-c783390a0ecef08df5c804f8c5f647431a04f502.zip
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/oprofile/Makefile1
-rw-r--r--arch/mips/oprofile/common.c1
-rw-r--r--arch/mips/oprofile/op_model_mipsxx.c29
3 files changed, 31 insertions, 0 deletions
diff --git a/arch/mips/oprofile/Makefile b/arch/mips/oprofile/Makefile
index 1208c280f77d..65f5237ec821 100644
--- a/arch/mips/oprofile/Makefile
+++ b/arch/mips/oprofile/Makefile
@@ -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
diff --git a/arch/mips/oprofile/common.c b/arch/mips/oprofile/common.c
index f80480a5a032..abd5a02f47cf 100644
--- a/arch/mips/oprofile/common.c
+++ b/arch/mips/oprofile/common.c
@@ -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;
diff --git a/arch/mips/oprofile/op_model_mipsxx.c b/arch/mips/oprofile/op_model_mipsxx.c
index 28ea1a4cc576..786254630403 100644
--- a/arch/mips/oprofile/op_model_mipsxx.c
+++ b/arch/mips/oprofile/op_model_mipsxx.c
@@ -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");