diff options
Diffstat (limited to 'drivers/gator/gator_iks.c')
-rw-r--r-- | drivers/gator/gator_iks.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/drivers/gator/gator_iks.c b/drivers/gator/gator_iks.c new file mode 100644 index 000000000000..9180b874457a --- /dev/null +++ b/drivers/gator/gator_iks.c @@ -0,0 +1,197 @@ +/** + * Copyright (C) ARM Limited 2013-2014. 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 |