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// SPDX-License-Identifier: BSD-2-Clause
/*
* Copyright (c) 2018, Linaro Limited
*/
#include <keep.h>
#include <kernel/panic.h>
#include <kernel/pm.h>
#include <kernel/spinlock.h>
#include <malloc.h>
#include <mm/core_memprot.h>
#include <string.h>
#include <types_ext.h>
#define PM_FLAG_SUSPENDED BIT(0)
static unsigned int pm_list_lock = SPINLOCK_UNLOCK;
static struct pm_callback_handle *pm_cb_ref;
static size_t pm_cb_count;
static const char no_name[] = "no-name";
DECLARE_KEEP_PAGER(no_name);
static void verify_cb_args(struct pm_callback_handle *pm_hdl)
{
if (is_unpaged((void *)(vaddr_t)pm_change_state) &&
(!is_unpaged((void *)(vaddr_t)pm_hdl->callback) ||
(pm_hdl->handle && !is_unpaged(pm_hdl->handle)))) {
EMSG("PM callbacks mandates unpaged arguments: %p %p",
(void *)(vaddr_t)pm_hdl->callback, pm_hdl->handle);
panic();
}
}
void register_pm_cb(struct pm_callback_handle *pm_hdl)
{
struct pm_callback_handle *ref = NULL;
const char *name = pm_hdl->name;
size_t count = pm_cb_count;
uint32_t exceptions = 0;
verify_cb_args(pm_hdl);
if (!name)
name = no_name;
if (!is_unpaged((void *)name)) {
name = strdup(name);
if (!name)
panic();
}
exceptions = cpu_spin_lock_xsave(&pm_list_lock);
ref = realloc(pm_cb_ref, sizeof(*ref) * (count + 1));
if (!ref)
panic();
ref[count] = *pm_hdl;
ref[count].flags = 0;
ref[count].name = name;
pm_cb_count = count + 1;
pm_cb_ref = ref;
cpu_spin_unlock_xrestore(&pm_list_lock, exceptions);
}
void unregister_pm_cb(struct pm_callback_handle *pm_hdl)
{
uint32_t exceptions = 0;
size_t n = 0;
exceptions = cpu_spin_lock_xsave(&pm_list_lock);
for (n = 0; n < pm_cb_count; n++)
if (pm_cb_ref[n].callback == pm_hdl->callback &&
pm_cb_ref[n].handle == pm_hdl->handle &&
pm_cb_ref[n].order == pm_hdl->order)
break;
if (n < pm_cb_count) {
pm_cb_count--;
memmove(pm_cb_ref + n, pm_cb_ref + n + 1,
(pm_cb_count - n) * sizeof(*pm_cb_ref));
}
cpu_spin_unlock_xrestore(&pm_list_lock, exceptions);
}
static TEE_Result do_pm_callback(enum pm_op op, uint32_t pm_hint,
struct pm_callback_handle *hdl)
{
TEE_Result res = TEE_ERROR_GENERIC;
bool suspending = op == PM_OP_SUSPEND;
if (suspending == (bool)(hdl->flags & PM_FLAG_SUSPENDED))
return TEE_SUCCESS;
DMSG("%s %s", suspending ? "Suspend" : "Resume", hdl->name);
res = hdl->callback(op, pm_hint, hdl);
if (res) {
EMSG("%s %s (%p) failed: %#"PRIx32, suspending ? "Suspend" :
"Resume", hdl->name, (void *)(vaddr_t)hdl->callback, res);
return res;
}
if (suspending)
hdl->flags |= PM_FLAG_SUSPENDED;
else
hdl->flags &= ~PM_FLAG_SUSPENDED;
return TEE_SUCCESS;
}
static TEE_Result call_callbacks(enum pm_op op, uint32_t pm_hint,
enum pm_callback_order order)
{
struct pm_callback_handle *hdl = NULL;
TEE_Result res = TEE_ERROR_GENERIC;
size_t n = 0;
/*
* Suspend first the last registered instances.
* Resume first the first registered instances.
*/
if (op == PM_OP_SUSPEND)
hdl = pm_cb_ref + pm_cb_count - 1;
else
hdl = pm_cb_ref;
for (n = 0; n < pm_cb_count; n++) {
if (hdl->order == order) {
res = do_pm_callback(op, pm_hint, hdl);
if (res)
return res;
}
if (op == PM_OP_SUSPEND)
hdl--;
else
hdl++;
}
return TEE_SUCCESS;
}
TEE_Result pm_change_state(enum pm_op op, uint32_t pm_hint)
{
enum pm_callback_order cnt = PM_CB_ORDER_DRIVER;
TEE_Result res = TEE_ERROR_GENERIC;
switch (op) {
case PM_OP_SUSPEND:
for (cnt = PM_CB_ORDER_DRIVER; cnt < PM_CB_ORDER_MAX; cnt++) {
res = call_callbacks(op, pm_hint, cnt);
if (res)
return res;
}
break;
case PM_OP_RESUME:
for (cnt = PM_CB_ORDER_MAX; cnt > PM_CB_ORDER_DRIVER; cnt--) {
res = call_callbacks(op, pm_hint, cnt - 1);
if (res)
return res;
}
break;
default:
panic();
}
return TEE_SUCCESS;
}
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