path: root/arch/powerpc/platforms/powernv/opal.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * PowerNV OPAL high level interfaces
 *
 * Copyright 2011 IBM Corp.
 */

#define pr_fmt(fmt)	"opal: " fmt

#include <linux/printk.h>
#include <linux/types.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/interrupt.h>
#include <linux/notifier.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/kobject.h>
#include <linux/delay.h>
#include <linux/memblock.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
#include <linux/kmsg_dump.h>
#include <linux/console.h>
#include <linux/sched/debug.h>

#include <asm/machdep.h>
#include <asm/opal.h>
#include <asm/firmware.h>
#include <asm/mce.h>
#include <asm/imc-pmu.h>
#include <asm/bug.h>

#include "powernv.h"

#define OPAL_MSG_QUEUE_MAX 16

struct opal_msg_node {
	struct list_head	list;
	struct opal_msg		msg;
};

static DEFINE_SPINLOCK(msg_list_lock);
static LIST_HEAD(msg_list);

/* /sys/firmware/opal */
struct kobject *opal_kobj;

struct opal {
	u64 base;
	u64 entry;
	u64 size;
} opal;

struct mcheck_recoverable_range {
	u64 start_addr;
	u64 end_addr;
	u64 recover_addr;
};

static int msg_list_size;

static struct mcheck_recoverable_range *mc_recoverable_range;
static int mc_recoverable_range_len;

struct device_node *opal_node;
static DEFINE_SPINLOCK(opal_write_lock);
static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX];
static uint32_t opal_heartbeat;
static struct task_struct *kopald_tsk;
static struct opal_msg *opal_msg;
static u32 opal_msg_size __ro_after_init;

void __init opal_configure_cores(void)
{
	u64 reinit_flags = 0;

	/* Do the actual re-init, This will clobber all FPRs, VRs, etc...
	 *
	 * It will preserve non volatile GPRs and HSPRG0/1. It will
	 * also restore HIDs and other SPRs to their original value
	 * but it might clobber a bunch.
	 */
#ifdef __BIG_ENDIAN__
	reinit_flags |= OPAL_REINIT_CPUS_HILE_BE;
#else
	reinit_flags |= OPAL_REINIT_CPUS_HILE_LE;
#endif

	/*
	 * POWER9 always support running hash:
	 *  ie. Host hash  supports  hash guests
	 *      Host radix supports  hash/radix guests
	 */
	if (early_cpu_has_feature(CPU_FTR_ARCH_300)) {
		reinit_flags |= OPAL_REINIT_CPUS_MMU_HASH;
		if (early_radix_enabled())
			reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX;
	}

	opal_reinit_cpus(reinit_flags);

	/* Restore some bits */
	if (cur_cpu_spec->cpu_restore)
		cur_cpu_spec->cpu_restore();
}

int __init early_init_dt_scan_opal(unsigned long node,
				   const char *uname, int depth, void *data)
{
	const void *basep, *entryp, *sizep;
	int basesz, entrysz, runtimesz;

	if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
		return 0;

	basep  = of_get_flat_dt_prop(node, "opal-base-address", &basesz);
	entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz);
	sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz);

	if (!basep || !entryp || !sizep)
		return 1;

	opal.base = of_read_number(basep, basesz/4);
	opal.entry = of_read_number(entryp, entrysz/4);
	opal.size = of_read_number(sizep, runtimesz/4);

	pr_debug("OPAL Base  = 0x%llx (basep=%p basesz=%d)\n",
		 opal.base, basep, basesz);
	pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n