blob: 05c98f1cdad0624cf2dd33f3eb3d090cfaa7d1ff [file] [log] [blame]
/*
* Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <amu.h>
#include <amu_private.h>
#include <arch.h>
#include <arch_helpers.h>
#include <platform.h>
#include <pubsub_events.h>
#define AMU_GROUP0_NR_COUNTERS 4
struct amu_ctx {
uint64_t group0_cnts[AMU_GROUP0_NR_COUNTERS];
uint64_t group1_cnts[AMU_GROUP1_NR_COUNTERS];
};
static struct amu_ctx amu_ctxs[PLATFORM_CORE_COUNT];
int amu_supported(void)
{
uint64_t features;
features = read_id_pfr0() >> ID_PFR0_AMU_SHIFT;
return (features & ID_PFR0_AMU_MASK) == 1;
}
void amu_enable(int el2_unused)
{
if (amu_supported() == 0)
return;
if (el2_unused) {
uint64_t v;
/*
* Non-secure access from EL0 or EL1 to the Activity Monitor
* registers do not trap to EL2.
*/
v = read_hcptr();
v &= ~TAM_BIT;
write_hcptr(v);
}
/* Enable group 0 counters */
write_amcntenset0(AMU_GROUP0_COUNTERS_MASK);
/* Enable group 1 counters */
write_amcntenset1(AMU_GROUP1_COUNTERS_MASK);
}
/* Read the group 0 counter identified by the given `idx`. */
uint64_t amu_group0_cnt_read(int idx)
{
assert(amu_supported() != 0);
assert(idx >= 0 && idx < AMU_GROUP0_NR_COUNTERS);
return amu_group0_cnt_read_internal(idx);
}
/* Write the group 0 counter identified by the given `idx` with `val`. */
void amu_group0_cnt_write(int idx, uint64_t val)
{
assert(amu_supported() != 0);
assert(idx >= 0 && idx < AMU_GROUP0_NR_COUNTERS);
amu_group0_cnt_write_internal(idx, val);
isb();
}
/* Read the group 1 counter identified by the given `idx`. */
uint64_t amu_group1_cnt_read(int idx)
{
assert(amu_supported() != 0);
assert(idx >= 0 && idx < AMU_GROUP1_NR_COUNTERS);
return amu_group1_cnt_read_internal(idx);
}
/* Write the group 1 counter identified by the given `idx` with `val`. */
void amu_group1_cnt_write(int idx, uint64_t val)
{
assert(amu_supported() != 0);
assert(idx >= 0 && idx < AMU_GROUP1_NR_COUNTERS);
amu_group1_cnt_write_internal(idx, val);
isb();
}
void amu_group1_set_evtype(int idx, unsigned int val)
{
assert(amu_supported() != 0);
assert(idx >= 0 && idx < AMU_GROUP1_NR_COUNTERS);
amu_group1_set_evtype_internal(idx, val);
isb();
}
static void *amu_context_save(const void *arg)
{
struct amu_ctx *ctx;
int i;
if (amu_supported() == 0)
return (void *)-1;
ctx = &amu_ctxs[plat_my_core_pos()];
/* Assert that group 0 counter configuration is what we expect */
assert(read_amcntenset0() == AMU_GROUP0_COUNTERS_MASK &&
read_amcntenset1() == AMU_GROUP1_COUNTERS_MASK);
/*
* Disable group 0 counters to avoid other observers like SCP sampling
* counter values from the future via the memory mapped view.
*/
write_amcntenclr0(AMU_GROUP0_COUNTERS_MASK);
write_amcntenclr1(AMU_GROUP1_COUNTERS_MASK);
isb();
for (i = 0; i < AMU_GROUP0_NR_COUNTERS; i++)
ctx->group0_cnts[i] = amu_group0_cnt_read(i);
for (i = 0; i < AMU_GROUP1_NR_COUNTERS; i++)
ctx->group1_cnts[i] = amu_group1_cnt_read(i);
return 0;
}
static void *amu_context_restore(const void *arg)
{
struct amu_ctx *ctx;
int i;
if (amu_supported() == 0)
return (void *)-1;
ctx = &amu_ctxs[plat_my_core_pos()];
/* Counters were disabled in `amu_context_save()` */
assert(read_amcntenset0() == 0 && read_amcntenset1() == 0);
/* Restore group 0 counters */
for (i = 0; i < AMU_GROUP0_NR_COUNTERS; i++)
amu_group0_cnt_write(i, ctx->group0_cnts[i]);
for (i = 0; i < AMU_GROUP1_NR_COUNTERS; i++)
amu_group1_cnt_write(i, ctx->group1_cnts[i]);
/* Enable group 0 counters */
write_amcntenset0(AMU_GROUP0_COUNTERS_MASK);
/* Enable group 1 counters */
write_amcntenset1(AMU_GROUP1_COUNTERS_MASK);
return 0;
}
SUBSCRIBE_TO_EVENT(psci_suspend_pwrdown_start, amu_context_save);
SUBSCRIBE_TO_EVENT(psci_suspend_pwrdown_finish, amu_context_restore);