1151 строка
25 KiB
C
1151 строка
25 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2017 Arm Ltd.
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#define pr_fmt(fmt) "sdei: " fmt
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#include <acpi/ghes.h>
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#include <linux/acpi.h>
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#include <linux/arm_sdei.h>
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#include <linux/arm-smccc.h>
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#include <linux/atomic.h>
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#include <linux/bitops.h>
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#include <linux/compiler.h>
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#include <linux/cpuhotplug.h>
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#include <linux/cpu.h>
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#include <linux/cpu_pm.h>
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#include <linux/errno.h>
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#include <linux/hardirq.h>
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#include <linux/kernel.h>
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#include <linux/kprobes.h>
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#include <linux/kvm_host.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/notifier.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/percpu.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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#include <linux/ptrace.h>
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#include <linux/preempt.h>
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#include <linux/reboot.h>
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#include <linux/slab.h>
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#include <linux/smp.h>
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#include <linux/spinlock.h>
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#include <linux/uaccess.h>
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/*
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* The call to use to reach the firmware.
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*/
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static asmlinkage void (*sdei_firmware_call)(unsigned long function_id,
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unsigned long arg0, unsigned long arg1,
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unsigned long arg2, unsigned long arg3,
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unsigned long arg4, struct arm_smccc_res *res);
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/* entry point from firmware to arch asm code */
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static unsigned long sdei_entry_point;
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struct sdei_event {
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/* These three are protected by the sdei_list_lock */
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struct list_head list;
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bool reregister;
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bool reenable;
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u32 event_num;
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u8 type;
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u8 priority;
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/* This pointer is handed to firmware as the event argument. */
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union {
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/* Shared events */
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struct sdei_registered_event *registered;
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/* CPU private events */
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struct sdei_registered_event __percpu *private_registered;
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};
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};
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/* Take the mutex for any API call or modification. Take the mutex first. */
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static DEFINE_MUTEX(sdei_events_lock);
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/* and then hold this when modifying the list */
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static DEFINE_SPINLOCK(sdei_list_lock);
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static LIST_HEAD(sdei_list);
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/* Private events are registered/enabled via IPI passing one of these */
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struct sdei_crosscall_args {
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struct sdei_event *event;
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atomic_t errors;
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int first_error;
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};
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#define CROSSCALL_INIT(arg, event) (arg.event = event, \
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arg.first_error = 0, \
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atomic_set(&arg.errors, 0))
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static inline int sdei_do_cross_call(void *fn, struct sdei_event * event)
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{
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struct sdei_crosscall_args arg;
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CROSSCALL_INIT(arg, event);
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on_each_cpu(fn, &arg, true);
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return arg.first_error;
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}
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static inline void
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sdei_cross_call_return(struct sdei_crosscall_args *arg, int err)
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{
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if (err && (atomic_inc_return(&arg->errors) == 1))
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arg->first_error = err;
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}
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static int sdei_to_linux_errno(unsigned long sdei_err)
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{
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switch (sdei_err) {
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case SDEI_NOT_SUPPORTED:
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return -EOPNOTSUPP;
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case SDEI_INVALID_PARAMETERS:
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return -EINVAL;
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case SDEI_DENIED:
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return -EPERM;
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case SDEI_PENDING:
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return -EINPROGRESS;
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case SDEI_OUT_OF_RESOURCE:
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return -ENOMEM;
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}
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/* Not an error value ... */
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return sdei_err;
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}
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/*
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* If x0 is any of these values, then the call failed, use sdei_to_linux_errno()
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* to translate.
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*/
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static int sdei_is_err(struct arm_smccc_res *res)
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{
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switch (res->a0) {
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case SDEI_NOT_SUPPORTED:
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case SDEI_INVALID_PARAMETERS:
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case SDEI_DENIED:
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case SDEI_PENDING:
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case SDEI_OUT_OF_RESOURCE:
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return true;
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}
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return false;
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}
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static int invoke_sdei_fn(unsigned long function_id, unsigned long arg0,
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unsigned long arg1, unsigned long arg2,
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unsigned long arg3, unsigned long arg4,
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u64 *result)
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{
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int err = 0;
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struct arm_smccc_res res;
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if (sdei_firmware_call) {
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sdei_firmware_call(function_id, arg0, arg1, arg2, arg3, arg4,
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&res);
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if (sdei_is_err(&res))
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err = sdei_to_linux_errno(res.a0);
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} else {
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/*
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* !sdei_firmware_call means we failed to probe or called
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* sdei_mark_interface_broken(). -EIO is not an error returned
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* by sdei_to_linux_errno() and is used to suppress messages
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* from this driver.
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*/
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err = -EIO;
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res.a0 = SDEI_NOT_SUPPORTED;
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}
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if (result)
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*result = res.a0;
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return err;
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}
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NOKPROBE_SYMBOL(invoke_sdei_fn);
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static struct sdei_event *sdei_event_find(u32 event_num)
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{
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struct sdei_event *e, *found = NULL;
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lockdep_assert_held(&sdei_events_lock);
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spin_lock(&sdei_list_lock);
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list_for_each_entry(e, &sdei_list, list) {
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if (e->event_num == event_num) {
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found = e;
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break;
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}
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}
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spin_unlock(&sdei_list_lock);
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return found;
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}
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int sdei_api_event_context(u32 query, u64 *result)
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{
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return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_CONTEXT, query, 0, 0, 0, 0,
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result);
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}
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NOKPROBE_SYMBOL(sdei_api_event_context);
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static int sdei_api_event_get_info(u32 event, u32 info, u64 *result)
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{
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return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_GET_INFO, event, info, 0,
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0, 0, result);
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}
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static struct sdei_event *sdei_event_create(u32 event_num,
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sdei_event_callback *cb,
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void *cb_arg)
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{
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int err;
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u64 result;
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struct sdei_event *event;
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struct sdei_registered_event *reg;
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lockdep_assert_held(&sdei_events_lock);
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event = kzalloc(sizeof(*event), GFP_KERNEL);
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if (!event)
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return ERR_PTR(-ENOMEM);
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INIT_LIST_HEAD(&event->list);
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event->event_num = event_num;
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err = sdei_api_event_get_info(event_num, SDEI_EVENT_INFO_EV_PRIORITY,
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&result);
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if (err) {
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kfree(event);
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return ERR_PTR(err);
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}
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event->priority = result;
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err = sdei_api_event_get_info(event_num, SDEI_EVENT_INFO_EV_TYPE,
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&result);
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if (err) {
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kfree(event);
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return ERR_PTR(err);
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}
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event->type = result;
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if (event->type == SDEI_EVENT_TYPE_SHARED) {
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reg = kzalloc(sizeof(*reg), GFP_KERNEL);
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if (!reg) {
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kfree(event);
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return ERR_PTR(-ENOMEM);
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}
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reg->event_num = event_num;
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reg->priority = event->priority;
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reg->callback = cb;
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reg->callback_arg = cb_arg;
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event->registered = reg;
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} else {
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int cpu;
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struct sdei_registered_event __percpu *regs;
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regs = alloc_percpu(struct sdei_registered_event);
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if (!regs) {
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kfree(event);
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return ERR_PTR(-ENOMEM);
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}
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for_each_possible_cpu(cpu) {
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reg = per_cpu_ptr(regs, cpu);
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reg->event_num = event->event_num;
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reg->priority = event->priority;
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reg->callback = cb;
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reg->callback_arg = cb_arg;
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}
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event->private_registered = regs;
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}
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spin_lock(&sdei_list_lock);
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list_add(&event->list, &sdei_list);
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spin_unlock(&sdei_list_lock);
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return event;
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}
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static void sdei_event_destroy_llocked(struct sdei_event *event)
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{
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lockdep_assert_held(&sdei_events_lock);
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lockdep_assert_held(&sdei_list_lock);
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list_del(&event->list);
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if (event->type == SDEI_EVENT_TYPE_SHARED)
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kfree(event->registered);
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else
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free_percpu(event->private_registered);
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kfree(event);
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}
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static void sdei_event_destroy(struct sdei_event *event)
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{
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spin_lock(&sdei_list_lock);
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sdei_event_destroy_llocked(event);
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spin_unlock(&sdei_list_lock);
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}
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static int sdei_api_get_version(u64 *version)
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{
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return invoke_sdei_fn(SDEI_1_0_FN_SDEI_VERSION, 0, 0, 0, 0, 0, version);
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}
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int sdei_mask_local_cpu(void)
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{
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int err;
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WARN_ON_ONCE(preemptible());
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err = invoke_sdei_fn(SDEI_1_0_FN_SDEI_PE_MASK, 0, 0, 0, 0, 0, NULL);
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if (err && err != -EIO) {
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pr_warn_once("failed to mask CPU[%u]: %d\n",
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smp_processor_id(), err);
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return err;
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}
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return 0;
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}
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static void _ipi_mask_cpu(void *ignored)
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{
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sdei_mask_local_cpu();
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}
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int sdei_unmask_local_cpu(void)
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{
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int err;
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WARN_ON_ONCE(preemptible());
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err = invoke_sdei_fn(SDEI_1_0_FN_SDEI_PE_UNMASK, 0, 0, 0, 0, 0, NULL);
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if (err && err != -EIO) {
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pr_warn_once("failed to unmask CPU[%u]: %d\n",
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smp_processor_id(), err);
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return err;
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}
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return 0;
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}
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static void _ipi_unmask_cpu(void *ignored)
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{
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sdei_unmask_local_cpu();
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}
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static void _ipi_private_reset(void *ignored)
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{
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int err;
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err = invoke_sdei_fn(SDEI_1_0_FN_SDEI_PRIVATE_RESET, 0, 0, 0, 0, 0,
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NULL);
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if (err && err != -EIO)
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pr_warn_once("failed to reset CPU[%u]: %d\n",
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smp_processor_id(), err);
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}
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static int sdei_api_shared_reset(void)
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{
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return invoke_sdei_fn(SDEI_1_0_FN_SDEI_SHARED_RESET, 0, 0, 0, 0, 0,
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NULL);
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}
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static void sdei_mark_interface_broken(void)
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{
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pr_err("disabling SDEI firmware interface\n");
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on_each_cpu(&_ipi_mask_cpu, NULL, true);
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sdei_firmware_call = NULL;
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}
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static int sdei_platform_reset(void)
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{
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int err;
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on_each_cpu(&_ipi_private_reset, NULL, true);
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err = sdei_api_shared_reset();
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if (err) {
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pr_err("Failed to reset platform: %d\n", err);
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sdei_mark_interface_broken();
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}
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return err;
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}
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static int sdei_api_event_enable(u32 event_num)
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{
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return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_ENABLE, event_num, 0, 0, 0,
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0, NULL);
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}
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/* Called directly by the hotplug callbacks */
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static void _local_event_enable(void *data)
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{
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int err;
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struct sdei_crosscall_args *arg = data;
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WARN_ON_ONCE(preemptible());
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err = sdei_api_event_enable(arg->event->event_num);
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sdei_cross_call_return(arg, err);
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}
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int sdei_event_enable(u32 event_num)
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{
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int err = -EINVAL;
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struct sdei_event *event;
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mutex_lock(&sdei_events_lock);
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event = sdei_event_find(event_num);
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if (!event) {
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mutex_unlock(&sdei_events_lock);
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return -ENOENT;
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}
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cpus_read_lock();
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if (event->type == SDEI_EVENT_TYPE_SHARED)
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err = sdei_api_event_enable(event->event_num);
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else
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err = sdei_do_cross_call(_local_event_enable, event);
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if (!err) {
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spin_lock(&sdei_list_lock);
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event->reenable = true;
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spin_unlock(&sdei_list_lock);
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}
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cpus_read_unlock();
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mutex_unlock(&sdei_events_lock);
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return err;
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}
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static int sdei_api_event_disable(u32 event_num)
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{
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return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_DISABLE, event_num, 0, 0,
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0, 0, NULL);
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}
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static void _ipi_event_disable(void *data)
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{
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int err;
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struct sdei_crosscall_args *arg = data;
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err = sdei_api_event_disable(arg->event->event_num);
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sdei_cross_call_return(arg, err);
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}
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int sdei_event_disable(u32 event_num)
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{
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int err = -EINVAL;
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struct sdei_event *event;
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mutex_lock(&sdei_events_lock);
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event = sdei_event_find(event_num);
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if (!event) {
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mutex_unlock(&sdei_events_lock);
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return -ENOENT;
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}
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spin_lock(&sdei_list_lock);
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event->reenable = false;
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spin_unlock(&sdei_list_lock);
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if (event->type == SDEI_EVENT_TYPE_SHARED)
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err = sdei_api_event_disable(event->event_num);
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else
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err = sdei_do_cross_call(_ipi_event_disable, event);
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mutex_unlock(&sdei_events_lock);
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return err;
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}
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static int sdei_api_event_unregister(u32 event_num)
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{
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return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_UNREGISTER, event_num, 0,
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0, 0, 0, NULL);
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}
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/* Called directly by the hotplug callbacks */
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static void _local_event_unregister(void *data)
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{
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int err;
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struct sdei_crosscall_args *arg = data;
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WARN_ON_ONCE(preemptible());
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err = sdei_api_event_unregister(arg->event->event_num);
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sdei_cross_call_return(arg, err);
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}
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static int _sdei_event_unregister(struct sdei_event *event)
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{
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lockdep_assert_held(&sdei_events_lock);
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if (event->type == SDEI_EVENT_TYPE_SHARED)
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return sdei_api_event_unregister(event->event_num);
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return sdei_do_cross_call(_local_event_unregister, event);
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}
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int sdei_event_unregister(u32 event_num)
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{
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int err;
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struct sdei_event *event;
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WARN_ON(in_nmi());
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mutex_lock(&sdei_events_lock);
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event = sdei_event_find(event_num);
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do {
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if (!event) {
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pr_warn("Event %u not registered\n", event_num);
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err = -ENOENT;
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break;
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}
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spin_lock(&sdei_list_lock);
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event->reregister = false;
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event->reenable = false;
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spin_unlock(&sdei_list_lock);
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err = _sdei_event_unregister(event);
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if (err)
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break;
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sdei_event_destroy(event);
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} while (0);
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mutex_unlock(&sdei_events_lock);
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return err;
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}
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/*
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* unregister events, but don't destroy them as they are re-registered by
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* sdei_reregister_shared().
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*/
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static int sdei_unregister_shared(void)
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{
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|
int err = 0;
|
|
struct sdei_event *event;
|
|
|
|
mutex_lock(&sdei_events_lock);
|
|
spin_lock(&sdei_list_lock);
|
|
list_for_each_entry(event, &sdei_list, list) {
|
|
if (event->type != SDEI_EVENT_TYPE_SHARED)
|
|
continue;
|
|
|
|
err = _sdei_event_unregister(event);
|
|
if (err)
|
|
break;
|
|
}
|
|
spin_unlock(&sdei_list_lock);
|
|
mutex_unlock(&sdei_events_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int sdei_api_event_register(u32 event_num, unsigned long entry_point,
|
|
void *arg, u64 flags, u64 affinity)
|
|
{
|
|
return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_REGISTER, event_num,
|
|
(unsigned long)entry_point, (unsigned long)arg,
|
|
flags, affinity, NULL);
|
|
}
|
|
|
|
/* Called directly by the hotplug callbacks */
|
|
static void _local_event_register(void *data)
|
|
{
|
|
int err;
|
|
struct sdei_registered_event *reg;
|
|
struct sdei_crosscall_args *arg = data;
|
|
|
|
WARN_ON(preemptible());
|
|
|
|
reg = per_cpu_ptr(arg->event->private_registered, smp_processor_id());
|
|
err = sdei_api_event_register(arg->event->event_num, sdei_entry_point,
|
|
reg, 0, 0);
|
|
|
|
sdei_cross_call_return(arg, err);
|
|
}
|
|
|
|
static int _sdei_event_register(struct sdei_event *event)
|
|
{
|
|
int err;
|
|
|
|
lockdep_assert_held(&sdei_events_lock);
|
|
|
|
if (event->type == SDEI_EVENT_TYPE_SHARED)
|
|
return sdei_api_event_register(event->event_num,
|
|
sdei_entry_point,
|
|
event->registered,
|
|
SDEI_EVENT_REGISTER_RM_ANY, 0);
|
|
|
|
err = sdei_do_cross_call(_local_event_register, event);
|
|
if (err)
|
|
sdei_do_cross_call(_local_event_unregister, event);
|
|
|
|
return err;
|
|
}
|
|
|
|
int sdei_event_register(u32 event_num, sdei_event_callback *cb, void *arg)
|
|
{
|
|
int err;
|
|
struct sdei_event *event;
|
|
|
|
WARN_ON(in_nmi());
|
|
|
|
mutex_lock(&sdei_events_lock);
|
|
do {
|
|
if (sdei_event_find(event_num)) {
|
|
pr_warn("Event %u already registered\n", event_num);
|
|
err = -EBUSY;
|
|
break;
|
|
}
|
|
|
|
event = sdei_event_create(event_num, cb, arg);
|
|
if (IS_ERR(event)) {
|
|
err = PTR_ERR(event);
|
|
pr_warn("Failed to create event %u: %d\n", event_num,
|
|
err);
|
|
break;
|
|
}
|
|
|
|
cpus_read_lock();
|
|
err = _sdei_event_register(event);
|
|
if (err) {
|
|
sdei_event_destroy(event);
|
|
pr_warn("Failed to register event %u: %d\n", event_num,
|
|
err);
|
|
} else {
|
|
spin_lock(&sdei_list_lock);
|
|
event->reregister = true;
|
|
spin_unlock(&sdei_list_lock);
|
|
}
|
|
cpus_read_unlock();
|
|
} while (0);
|
|
mutex_unlock(&sdei_events_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int sdei_reregister_event_llocked(struct sdei_event *event)
|
|
{
|
|
int err;
|
|
|
|
lockdep_assert_held(&sdei_events_lock);
|
|
lockdep_assert_held(&sdei_list_lock);
|
|
|
|
err = _sdei_event_register(event);
|
|
if (err) {
|
|
pr_err("Failed to re-register event %u\n", event->event_num);
|
|
sdei_event_destroy_llocked(event);
|
|
return err;
|
|
}
|
|
|
|
if (event->reenable) {
|
|
if (event->type == SDEI_EVENT_TYPE_SHARED)
|
|
err = sdei_api_event_enable(event->event_num);
|
|
else
|
|
err = sdei_do_cross_call(_local_event_enable, event);
|
|
}
|
|
|
|
if (err)
|
|
pr_err("Failed to re-enable event %u\n", event->event_num);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int sdei_reregister_shared(void)
|
|
{
|
|
int err = 0;
|
|
struct sdei_event *event;
|
|
|
|
mutex_lock(&sdei_events_lock);
|
|
spin_lock(&sdei_list_lock);
|
|
list_for_each_entry(event, &sdei_list, list) {
|
|
if (event->type != SDEI_EVENT_TYPE_SHARED)
|
|
continue;
|
|
|
|
if (event->reregister) {
|
|
err = sdei_reregister_event_llocked(event);
|
|
if (err)
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&sdei_list_lock);
|
|
mutex_unlock(&sdei_events_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int sdei_cpuhp_down(unsigned int cpu)
|
|
{
|
|
struct sdei_event *event;
|
|
struct sdei_crosscall_args arg;
|
|
|
|
/* un-register private events */
|
|
spin_lock(&sdei_list_lock);
|
|
list_for_each_entry(event, &sdei_list, list) {
|
|
if (event->type == SDEI_EVENT_TYPE_SHARED)
|
|
continue;
|
|
|
|
CROSSCALL_INIT(arg, event);
|
|
/* call the cross-call function locally... */
|
|
_local_event_unregister(&arg);
|
|
if (arg.first_error)
|
|
pr_err("Failed to unregister event %u: %d\n",
|
|
event->event_num, arg.first_error);
|
|
}
|
|
spin_unlock(&sdei_list_lock);
|
|
|
|
return sdei_mask_local_cpu();
|
|
}
|
|
|
|
static int sdei_cpuhp_up(unsigned int cpu)
|
|
{
|
|
struct sdei_event *event;
|
|
struct sdei_crosscall_args arg;
|
|
|
|
/* re-register/enable private events */
|
|
spin_lock(&sdei_list_lock);
|
|
list_for_each_entry(event, &sdei_list, list) {
|
|
if (event->type == SDEI_EVENT_TYPE_SHARED)
|
|
continue;
|
|
|
|
if (event->reregister) {
|
|
CROSSCALL_INIT(arg, event);
|
|
/* call the cross-call function locally... */
|
|
_local_event_register(&arg);
|
|
if (arg.first_error)
|
|
pr_err("Failed to re-register event %u: %d\n",
|
|
event->event_num, arg.first_error);
|
|
}
|
|
|
|
if (event->reenable) {
|
|
CROSSCALL_INIT(arg, event);
|
|
_local_event_enable(&arg);
|
|
if (arg.first_error)
|
|
pr_err("Failed to re-enable event %u: %d\n",
|
|
event->event_num, arg.first_error);
|
|
}
|
|
}
|
|
spin_unlock(&sdei_list_lock);
|
|
|
|
return sdei_unmask_local_cpu();
|
|
}
|
|
|
|
/* When entering idle, mask/unmask events for this cpu */
|
|
static int sdei_pm_notifier(struct notifier_block *nb, unsigned long action,
|
|
void *data)
|
|
{
|
|
int rv;
|
|
|
|
switch (action) {
|
|
case CPU_PM_ENTER:
|
|
rv = sdei_mask_local_cpu();
|
|
break;
|
|
case CPU_PM_EXIT:
|
|
case CPU_PM_ENTER_FAILED:
|
|
rv = sdei_unmask_local_cpu();
|
|
break;
|
|
default:
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
if (rv)
|
|
return notifier_from_errno(rv);
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block sdei_pm_nb = {
|
|
.notifier_call = sdei_pm_notifier,
|
|
};
|
|
|
|
static int sdei_device_suspend(struct device *dev)
|
|
{
|
|
on_each_cpu(_ipi_mask_cpu, NULL, true);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sdei_device_resume(struct device *dev)
|
|
{
|
|
on_each_cpu(_ipi_unmask_cpu, NULL, true);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We need all events to be reregistered when we resume from hibernate.
|
|
*
|
|
* The sequence is freeze->thaw. Reboot. freeze->restore. We unregister
|
|
* events during freeze, then re-register and re-enable them during thaw
|
|
* and restore.
|
|
*/
|
|
static int sdei_device_freeze(struct device *dev)
|
|
{
|
|
int err;
|
|
|
|
/* unregister private events */
|
|
cpuhp_remove_state(CPUHP_AP_ARM_SDEI_STARTING);
|
|
|
|
err = sdei_unregister_shared();
|
|
if (err)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sdei_device_thaw(struct device *dev)
|
|
{
|
|
int err;
|
|
|
|
/* re-register shared events */
|
|
err = sdei_reregister_shared();
|
|
if (err) {
|
|
pr_warn("Failed to re-register shared events...\n");
|
|
sdei_mark_interface_broken();
|
|
return err;
|
|
}
|
|
|
|
err = cpuhp_setup_state(CPUHP_AP_ARM_SDEI_STARTING, "SDEI",
|
|
&sdei_cpuhp_up, &sdei_cpuhp_down);
|
|
if (err)
|
|
pr_warn("Failed to re-register CPU hotplug notifier...\n");
|
|
|
|
return err;
|
|
}
|
|
|
|
static int sdei_device_restore(struct device *dev)
|
|
{
|
|
int err;
|
|
|
|
err = sdei_platform_reset();
|
|
if (err)
|
|
return err;
|
|
|
|
return sdei_device_thaw(dev);
|
|
}
|
|
|
|
static const struct dev_pm_ops sdei_pm_ops = {
|
|
.suspend = sdei_device_suspend,
|
|
.resume = sdei_device_resume,
|
|
.freeze = sdei_device_freeze,
|
|
.thaw = sdei_device_thaw,
|
|
.restore = sdei_device_restore,
|
|
};
|
|
|
|
/*
|
|
* Mask all CPUs and unregister all events on panic, reboot or kexec.
|
|
*/
|
|
static int sdei_reboot_notifier(struct notifier_block *nb, unsigned long action,
|
|
void *data)
|
|
{
|
|
/*
|
|
* We are going to reset the interface, after this there is no point
|
|
* doing work when we take CPUs offline.
|
|
*/
|
|
cpuhp_remove_state(CPUHP_AP_ARM_SDEI_STARTING);
|
|
|
|
sdei_platform_reset();
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block sdei_reboot_nb = {
|
|
.notifier_call = sdei_reboot_notifier,
|
|
};
|
|
|
|
static void sdei_smccc_smc(unsigned long function_id,
|
|
unsigned long arg0, unsigned long arg1,
|
|
unsigned long arg2, unsigned long arg3,
|
|
unsigned long arg4, struct arm_smccc_res *res)
|
|
{
|
|
arm_smccc_smc(function_id, arg0, arg1, arg2, arg3, arg4, 0, 0, res);
|
|
}
|
|
NOKPROBE_SYMBOL(sdei_smccc_smc);
|
|
|
|
static void sdei_smccc_hvc(unsigned long function_id,
|
|
unsigned long arg0, unsigned long arg1,
|
|
unsigned long arg2, unsigned long arg3,
|
|
unsigned long arg4, struct arm_smccc_res *res)
|
|
{
|
|
arm_smccc_hvc(function_id, arg0, arg1, arg2, arg3, arg4, 0, 0, res);
|
|
}
|
|
NOKPROBE_SYMBOL(sdei_smccc_hvc);
|
|
|
|
int sdei_register_ghes(struct ghes *ghes, sdei_event_callback *normal_cb,
|
|
sdei_event_callback *critical_cb)
|
|
{
|
|
int err;
|
|
u64 result;
|
|
u32 event_num;
|
|
sdei_event_callback *cb;
|
|
|
|
if (!IS_ENABLED(CONFIG_ACPI_APEI_GHES))
|
|
return -EOPNOTSUPP;
|
|
|
|
event_num = ghes->generic->notify.vector;
|
|
if (event_num == 0) {
|
|
/*
|
|
* Event 0 is reserved by the specification for
|
|
* SDEI_EVENT_SIGNAL.
|
|
*/
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = sdei_api_event_get_info(event_num, SDEI_EVENT_INFO_EV_PRIORITY,
|
|
&result);
|
|
if (err)
|
|
return err;
|
|
|
|
if (result == SDEI_EVENT_PRIORITY_CRITICAL)
|
|
cb = critical_cb;
|
|
else
|
|
cb = normal_cb;
|
|
|
|
err = sdei_event_register(event_num, cb, ghes);
|
|
if (!err)
|
|
err = sdei_event_enable(event_num);
|
|
|
|
return err;
|
|
}
|
|
|
|
int sdei_unregister_ghes(struct ghes *ghes)
|
|
{
|
|
int i;
|
|
int err;
|
|
u32 event_num = ghes->generic->notify.vector;
|
|
|
|
might_sleep();
|
|
|
|
if (!IS_ENABLED(CONFIG_ACPI_APEI_GHES))
|
|
return -EOPNOTSUPP;
|
|
|
|
/*
|
|
* The event may be running on another CPU. Disable it
|
|
* to stop new events, then try to unregister a few times.
|
|
*/
|
|
err = sdei_event_disable(event_num);
|
|
if (err)
|
|
return err;
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
err = sdei_event_unregister(event_num);
|
|
if (err != -EINPROGRESS)
|
|
break;
|
|
|
|
schedule();
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int sdei_get_conduit(struct platform_device *pdev)
|
|
{
|
|
const char *method;
|
|
struct device_node *np = pdev->dev.of_node;
|
|
|
|
sdei_firmware_call = NULL;
|
|
if (np) {
|
|
if (of_property_read_string(np, "method", &method)) {
|
|
pr_warn("missing \"method\" property\n");
|
|
return SMCCC_CONDUIT_NONE;
|
|
}
|
|
|
|
if (!strcmp("hvc", method)) {
|
|
sdei_firmware_call = &sdei_smccc_hvc;
|
|
return SMCCC_CONDUIT_HVC;
|
|
} else if (!strcmp("smc", method)) {
|
|
sdei_firmware_call = &sdei_smccc_smc;
|
|
return SMCCC_CONDUIT_SMC;
|
|
}
|
|
|
|
pr_warn("invalid \"method\" property: %s\n", method);
|
|
} else if (IS_ENABLED(CONFIG_ACPI) && !acpi_disabled) {
|
|
if (acpi_psci_use_hvc()) {
|
|
sdei_firmware_call = &sdei_smccc_hvc;
|
|
return SMCCC_CONDUIT_HVC;
|
|
} else {
|
|
sdei_firmware_call = &sdei_smccc_smc;
|
|
return SMCCC_CONDUIT_SMC;
|
|
}
|
|
}
|
|
|
|
return SMCCC_CONDUIT_NONE;
|
|
}
|
|
|
|
static int sdei_probe(struct platform_device *pdev)
|
|
{
|
|
int err;
|
|
u64 ver = 0;
|
|
int conduit;
|
|
|
|
conduit = sdei_get_conduit(pdev);
|
|
if (!sdei_firmware_call)
|
|
return 0;
|
|
|
|
err = sdei_api_get_version(&ver);
|
|
if (err == -EOPNOTSUPP)
|
|
pr_err("advertised but not implemented in platform firmware\n");
|
|
if (err) {
|
|
pr_err("Failed to get SDEI version: %d\n", err);
|
|
sdei_mark_interface_broken();
|
|
return err;
|
|
}
|
|
|
|
pr_info("SDEIv%d.%d (0x%x) detected in firmware.\n",
|
|
(int)SDEI_VERSION_MAJOR(ver), (int)SDEI_VERSION_MINOR(ver),
|
|
(int)SDEI_VERSION_VENDOR(ver));
|
|
|
|
if (SDEI_VERSION_MAJOR(ver) != 1) {
|
|
pr_warn("Conflicting SDEI version detected.\n");
|
|
sdei_mark_interface_broken();
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = sdei_platform_reset();
|
|
if (err)
|
|
return err;
|
|
|
|
sdei_entry_point = sdei_arch_get_entry_point(conduit);
|
|
if (!sdei_entry_point) {
|
|
/* Not supported due to hardware or boot configuration */
|
|
sdei_mark_interface_broken();
|
|
return 0;
|
|
}
|
|
|
|
err = cpu_pm_register_notifier(&sdei_pm_nb);
|
|
if (err) {
|
|
pr_warn("Failed to register CPU PM notifier...\n");
|
|
goto error;
|
|
}
|
|
|
|
err = register_reboot_notifier(&sdei_reboot_nb);
|
|
if (err) {
|
|
pr_warn("Failed to register reboot notifier...\n");
|
|
goto remove_cpupm;
|
|
}
|
|
|
|
err = cpuhp_setup_state(CPUHP_AP_ARM_SDEI_STARTING, "SDEI",
|
|
&sdei_cpuhp_up, &sdei_cpuhp_down);
|
|
if (err) {
|
|
pr_warn("Failed to register CPU hotplug notifier...\n");
|
|
goto remove_reboot;
|
|
}
|
|
|
|
return 0;
|
|
|
|
remove_reboot:
|
|
unregister_reboot_notifier(&sdei_reboot_nb);
|
|
|
|
remove_cpupm:
|
|
cpu_pm_unregister_notifier(&sdei_pm_nb);
|
|
|
|
error:
|
|
sdei_mark_interface_broken();
|
|
return err;
|
|
}
|
|
|
|
static const struct of_device_id sdei_of_match[] = {
|
|
{ .compatible = "arm,sdei-1.0" },
|
|
{}
|
|
};
|
|
|
|
static struct platform_driver sdei_driver = {
|
|
.driver = {
|
|
.name = "sdei",
|
|
.pm = &sdei_pm_ops,
|
|
.of_match_table = sdei_of_match,
|
|
},
|
|
.probe = sdei_probe,
|
|
};
|
|
|
|
static bool __init sdei_present_acpi(void)
|
|
{
|
|
acpi_status status;
|
|
struct acpi_table_header *sdei_table_header;
|
|
|
|
if (acpi_disabled)
|
|
return false;
|
|
|
|
status = acpi_get_table(ACPI_SIG_SDEI, 0, &sdei_table_header);
|
|
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
|
|
const char *msg = acpi_format_exception(status);
|
|
|
|
pr_info("Failed to get ACPI:SDEI table, %s\n", msg);
|
|
}
|
|
if (ACPI_FAILURE(status))
|
|
return false;
|
|
|
|
acpi_put_table(sdei_table_header);
|
|
|
|
return true;
|
|
}
|
|
|
|
static int __init sdei_init(void)
|
|
{
|
|
int ret = platform_driver_register(&sdei_driver);
|
|
|
|
if (!ret && sdei_present_acpi()) {
|
|
struct platform_device *pdev;
|
|
|
|
pdev = platform_device_register_simple(sdei_driver.driver.name,
|
|
0, NULL, 0);
|
|
if (IS_ERR(pdev))
|
|
pr_info("Failed to register ACPI:SDEI platform device %ld\n",
|
|
PTR_ERR(pdev));
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* On an ACPI system SDEI needs to be ready before HEST:GHES tries to register
|
|
* its events. ACPI is initialised from a subsys_initcall(), GHES is initialised
|
|
* by device_initcall(). We want to be called in the middle.
|
|
*/
|
|
subsys_initcall_sync(sdei_init);
|
|
|
|
int sdei_event_handler(struct pt_regs *regs,
|
|
struct sdei_registered_event *arg)
|
|
{
|
|
int err;
|
|
mm_segment_t orig_addr_limit;
|
|
u32 event_num = arg->event_num;
|
|
|
|
/*
|
|
* Save restore 'fs'.
|
|
* The architecture's entry code save/restores 'fs' when taking an
|
|
* exception from the kernel. This ensures addr_limit isn't inherited
|
|
* if you interrupted something that allowed the uaccess routines to
|
|
* access kernel memory.
|
|
* Do the same here because this doesn't come via the same entry code.
|
|
*/
|
|
orig_addr_limit = force_uaccess_begin();
|
|
|
|
err = arg->callback(event_num, regs, arg->callback_arg);
|
|
if (err)
|
|
pr_err_ratelimited("event %u on CPU %u failed with error: %d\n",
|
|
event_num, smp_processor_id(), err);
|
|
|
|
force_uaccess_end(orig_addr_limit);
|
|
|
|
return err;
|
|
}
|
|
NOKPROBE_SYMBOL(sdei_event_handler);
|