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/**
* Copyright (C) ARM Limited 2013-2015. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#if GATOR_IKS_SUPPORT
#include <linux/of.h>
#include <asm/bL_switcher.h>
#include <asm/smp_plat.h>
#include <trace/events/power_cpu_migrate.h>
static bool map_cpuids;
static int mpidr_cpuids[NR_CPUS];
static const struct gator_cpu *mpidr_cpus[NR_CPUS];
static int __lcpu_to_pcpu[NR_CPUS];
static const struct gator_cpu *gator_find_cpu_by_dt_name(const char *const name)
{
int i;
for (i = 0; gator_cpus[i].cpuid != 0; ++i) {
const struct gator_cpu *const gator_cpu = &gator_cpus[i];
if (gator_cpu->dt_name != NULL && strcmp(gator_cpu->dt_name, name) == 0)
return gator_cpu;
}
return NULL;
}
static void calc_first_cluster_size(void)
{
int len;
const u32 *val;
const char *compatible;
struct device_node *cn = NULL;
int mpidr_cpuids_count = 0;
/* Zero is a valid cpuid, so initialize the array to 0xff's */
memset(&mpidr_cpuids, 0xff, sizeof(mpidr_cpuids));
memset(&mpidr_cpus, 0, sizeof(mpidr_cpus));
while ((cn = of_find_node_by_type(cn, "cpu"))) {
BUG_ON(mpidr_cpuids_count >= NR_CPUS);
val = of_get_property(cn, "reg", &len);
if (!val || len != 4) {
pr_err("%s missing reg property\n", cn->full_name);
continue;
}
compatible = of_get_property(cn, "compatible", NULL);
if (compatible == NULL) {
pr_err("%s missing compatible property\n", cn->full_name);
continue;
}
mpidr_cpuids[mpidr_cpuids_count] = be32_to_cpup(val);
mpidr_cpus[mpidr_cpuids_count] = gator_find_cpu_by_dt_name(compatible);
++mpidr_cpuids_count;
}
map_cpuids = (mpidr_cpuids_count == nr_cpu_ids);
}
static int linearize_mpidr(int mpidr)
{
int i;
for (i = 0; i < nr_cpu_ids; ++i) {
if (mpidr_cpuids[i] == mpidr)
return i;
}
BUG();
}
int lcpu_to_pcpu(const int lcpu)
{
int pcpu;
if (!map_cpuids)
return lcpu;
BUG_ON(lcpu >= nr_cpu_ids || lcpu < 0);
pcpu = __lcpu_to_pcpu[lcpu];
BUG_ON(pcpu >= nr_cpu_ids || pcpu < 0);
return pcpu;
}
int pcpu_to_lcpu(const int pcpu)
{
int lcpu;
if (!map_cpuids)
return pcpu;
BUG_ON(pcpu >= nr_cpu_ids || pcpu < 0);
for (lcpu = 0; lcpu < nr_cpu_ids; ++lcpu) {
if (__lcpu_to_pcpu[lcpu] == pcpu) {
BUG_ON(lcpu >= nr_cpu_ids || lcpu < 0);
return lcpu;
}
}
BUG();
}
static void gator_update_cpu_mapping(u32 cpu_hwid)
{
int lcpu = smp_processor_id();
int pcpu = linearize_mpidr(cpu_hwid & MPIDR_HWID_BITMASK);
BUG_ON(lcpu >= nr_cpu_ids || lcpu < 0);
BUG_ON(pcpu >= nr_cpu_ids || pcpu < 0);
__lcpu_to_pcpu[lcpu] = pcpu;
}
GATOR_DEFINE_PROBE(cpu_migrate_begin, TP_PROTO(u64 timestamp, u32 cpu_hwid))
{
const int cpu = get_physical_cpu();
gator_timer_offline((void *)1);
gator_timer_offline_dispatch(cpu, true);
}
GATOR_DEFINE_PROBE(cpu_migrate_finish, TP_PROTO(u64 timestamp, u32 cpu_hwid))
{
int cpu;
gator_update_cpu_mapping(cpu_hwid);
/* get_physical_cpu must be called after gator_update_cpu_mapping */
cpu = get_physical_cpu();
gator_timer_online_dispatch(cpu, true);
gator_timer_online((void *)1);
}
GATOR_DEFINE_PROBE(cpu_migrate_current, TP_PROTO(u64 timestamp, u32 cpu_hwid))
{
gator_update_cpu_mapping(cpu_hwid);
}
static void gator_send_iks_core_names(void)
{
int cpu;
/* Send the cpu names */
preempt_disable();
for (cpu = 0; cpu < nr_cpu_ids; ++cpu) {
if (mpidr_cpus[cpu] != NULL)
gator_send_core_name(cpu, mpidr_cpus[cpu]->cpuid);
}
preempt_enable();
}
static int gator_migrate_start(void)
{
int retval = 0;
if (!map_cpuids)
return retval;
if (retval == 0)
retval = GATOR_REGISTER_TRACE(cpu_migrate_begin);
if (retval == 0)
retval = GATOR_REGISTER_TRACE(cpu_migrate_finish);
if (retval == 0)
retval = GATOR_REGISTER_TRACE(cpu_migrate_current);
if (retval == 0) {
/* Initialize the logical to physical cpu mapping */
memset(&__lcpu_to_pcpu, 0xff, sizeof(__lcpu_to_pcpu));
bL_switcher_trace_trigger();
}
return retval;
}
static void gator_migrate_stop(void)
{
if (!map_cpuids)
return;
GATOR_UNREGISTER_TRACE(cpu_migrate_current);
GATOR_UNREGISTER_TRACE(cpu_migrate_finish);
GATOR_UNREGISTER_TRACE(cpu_migrate_begin);
}
#else
#define calc_first_cluster_size()
#define gator_send_iks_core_names()
#define gator_migrate_start() 0
#define gator_migrate_stop()
#endif
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