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// SPDX-License-Identifier: GPL-2.0
/*
* Ultravisor high level interfaces
*
* Copyright 2019, IBM Corporation.
*
*/
#include <linux/init.h>
#include <linux/printk.h>
#include <linux/of_fdt.h>
#include <linux/of.h>
#include <asm/ultravisor.h>
#include <asm/firmware.h>
#include <asm/machdep.h>
#include "powernv.h"
static struct kobject *ultravisor_kobj;
int __init early_init_dt_scan_ultravisor(unsigned long node, const char *uname,
int depth, void *data)
{
if (!of_flat_dt_is_compatible(node, "ibm,ultravisor"))
return 0;
powerpc_firmware_features |= FW_FEATURE_ULTRAVISOR;
pr_debug("Ultravisor detected!\n");
return 1;
}
static struct memcons *uv_memcons;
static ssize_t uv_msglog_read(struct file *file, struct kobject *kobj,
struct bin_attribute *bin_attr, char *to,
loff_t pos, size_t count)
{
return memcons_copy(uv_memcons, to, pos, count);
}
static struct bin_attribute uv_msglog_attr = {
.attr = {.name = "msglog", .mode = 0400},
.read = uv_msglog_read
};
static int __init uv_init(void)
{
struct device_node *node;
if (!firmware_has_feature(FW_FEATURE_ULTRAVISOR))
return 0;
node = of_find_compatible_node(NULL, NULL, "ibm,uv-firmware");
if (!node)
return -ENODEV;
uv_memcons = memcons_init(node, "memcons");
if (!uv_memcons)
return -ENOENT;
uv_msglog_attr.size = memcons_get_size(uv_memcons);
ultravisor_kobj = kobject_create_and_add("ultravisor", firmware_kobj);
if (!ultravisor_kobj)
return -ENOMEM;
return sysfs_create_bin_file(ultravisor_kobj, &uv_msglog_attr);
}
machine_subsys_initcall(powernv, uv_init);
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