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// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
/*
* OPAL Message queue between host and skiboot
*
* Copyright 2013-2019 IBM Corp.
*/
#define pr_fmt(fmt) "opalmsg: " fmt
#include <skiboot.h>
#include <opal-msg.h>
#include <opal-api.h>
#include <lock.h>
#define OPAL_MAX_MSGS (OPAL_MSG_TYPE_MAX + OPAL_MAX_ASYNC_COMP - 1)
struct opal_msg_entry {
struct list_node link;
void (*consumed)(void *data, int status);
bool extended;
void *data;
struct opal_msg msg;
};
static LIST_HEAD(msg_free_list);
static LIST_HEAD(msg_pending_list);
static struct lock opal_msg_lock = LOCK_UNLOCKED;
int _opal_queue_msg(enum opal_msg_type msg_type, void *data,
void (*consumed)(void *data, int status),
size_t params_size, const void *params)
{
struct opal_msg_entry *entry;
uint64_t entry_size;
if ((params_size + OPAL_MSG_HDR_SIZE) > OPAL_MSG_SIZE) {
prlog(PR_DEBUG, "param_size (0x%x) > opal_msg param size (0x%x)\n",
(u32)params_size, (u32)(OPAL_MSG_SIZE - OPAL_MSG_HDR_SIZE));
return OPAL_PARAMETER;
}
lock(&opal_msg_lock);
if (params_size > OPAL_MSG_FIXED_PARAMS_SIZE) {
entry_size = sizeof(struct opal_msg_entry) + params_size;
entry_size -= OPAL_MSG_FIXED_PARAMS_SIZE;
entry = zalloc(entry_size);
if (entry)
entry->extended = true;
} else {
entry = list_pop(&msg_free_list, struct opal_msg_entry, link);
if (!entry) {
prerror("No available node in the free list, allocating\n");
entry = zalloc(sizeof(struct opal_msg_entry));
}
}
if (!entry) {
prerror("Allocation failed\n");
unlock(&opal_msg_lock);
return OPAL_RESOURCE;
}
entry->consumed = consumed;
entry->data = data;
entry->msg.msg_type = cpu_to_be32(msg_type);
entry->msg.size = cpu_to_be32(params_size);
memcpy(entry->msg.params, params, params_size);
list_add_tail(&msg_pending_list, &entry->link);
opal_update_pending_evt(OPAL_EVENT_MSG_PENDING,
OPAL_EVENT_MSG_PENDING);
unlock(&opal_msg_lock);
return OPAL_SUCCESS;
}
static int64_t opal_get_msg(uint64_t *buffer, uint64_t size)
{
struct opal_msg_entry *entry;
void (*callback)(void *data, int status);
void *data;
uint64_t msg_size;
int rc = OPAL_SUCCESS;
if (size < sizeof(struct opal_msg) || !buffer)
return OPAL_PARAMETER;
if (!opal_addr_valid(buffer))
return OPAL_PARAMETER;
lock(&opal_msg_lock);
entry = list_pop(&msg_pending_list, struct opal_msg_entry, link);
if (!entry) {
unlock(&opal_msg_lock);
return OPAL_RESOURCE;
}
msg_size = OPAL_MSG_HDR_SIZE + be32_to_cpu(entry->msg.size);
if (size < msg_size) {
/* Send partial data to Linux */
prlog(PR_NOTICE, "Sending partial data [msg_type : 0x%x, "
"msg_size : 0x%x, buf_size : 0x%x]\n",
be32_to_cpu(entry->msg.msg_type),
(u32)msg_size, (u32)size);
entry->msg.size = cpu_to_be32(size - OPAL_MSG_HDR_SIZE);
msg_size = size;
rc = OPAL_PARTIAL;
}
memcpy((void *)buffer, (void *)&entry->msg, msg_size);
callback = entry->consumed;
data = entry->data;
if (entry->extended)
free(entry);
else
list_add(&msg_free_list, &entry->link);
if (list_empty(&msg_pending_list))
opal_update_pending_evt(OPAL_EVENT_MSG_PENDING, 0);
unlock(&opal_msg_lock);
if (callback)
callback(data, rc);
return rc;
}
opal_call(OPAL_GET_MSG, opal_get_msg, 2);
static int64_t opal_check_completion(uint64_t *buffer, uint64_t size,
uint64_t token)
{
struct opal_msg_entry *entry, *next_entry;
void (*callback)(void *data, int status) = NULL;
int rc = OPAL_BUSY;
void *data = NULL;
if (!opal_addr_valid(buffer))
return OPAL_PARAMETER;
lock(&opal_msg_lock);
list_for_each_safe(&msg_pending_list, entry, next_entry, link) {
if (be32_to_cpu(entry->msg.msg_type) == OPAL_MSG_ASYNC_COMP &&
be64_to_cpu(entry->msg.params[0]) == token) {
list_del(&entry->link);
callback = entry->consumed;
data = entry->data;
list_add(&msg_free_list, &entry->link);
if (list_empty(&msg_pending_list))
opal_update_pending_evt(OPAL_EVENT_MSG_PENDING,
0);
rc = OPAL_SUCCESS;
break;
}
}
if (rc == OPAL_SUCCESS && size >= sizeof(struct opal_msg))
memcpy(buffer, &entry->msg, sizeof(entry->msg));
unlock(&opal_msg_lock);
if (callback)
callback(data, OPAL_SUCCESS);
return rc;
}
opal_call(OPAL_CHECK_ASYNC_COMPLETION, opal_check_completion, 3);
void opal_init_msg(void)
{
struct opal_msg_entry *entry;
int i;
for (i = 0; i < OPAL_MAX_MSGS; i++, entry++) {
entry = zalloc(sizeof(*entry));
if (!entry)
goto err;
list_add_tail(&msg_free_list, &entry->link);
}
return;
err:
for (; i > 0; i--) {
entry = list_pop(&msg_free_list, struct opal_msg_entry, link);
if (entry)
free(entry);
}
}
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