forked from Minki/linux
65527a51c6
Export the module FDT device table to ensure the FDT compatible strings
are listed in the module alias. This help the pvpanic driver can be
loaded on boot automatically not only the ACPI device, but also the FDT
device.
Fixes: 46f934c9a1 ("misc/pvpanic: add support to get pvpanic device info FDT")
Signed-off-by: Shile Zhang <shile.zhang@linux.alibaba.com>
Link: https://lore.kernel.org/r/20210218123116.207751-1-shile.zhang@linux.alibaba.com
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
162 lines
3.4 KiB
C
162 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Pvpanic Device Support
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*
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* Copyright (C) 2013 Fujitsu.
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* Copyright (C) 2018 ZTE.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/kexec.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/types.h>
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#include <uapi/misc/pvpanic.h>
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static void __iomem *base;
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static unsigned int capability = PVPANIC_PANICKED | PVPANIC_CRASH_LOADED;
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static unsigned int events;
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static ssize_t capability_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sysfs_emit(buf, "%x\n", capability);
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}
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static DEVICE_ATTR_RO(capability);
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static ssize_t events_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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return sysfs_emit(buf, "%x\n", events);
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}
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static ssize_t events_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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unsigned int tmp;
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int err;
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err = kstrtouint(buf, 16, &tmp);
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if (err)
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return err;
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if ((tmp & capability) != tmp)
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return -EINVAL;
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events = tmp;
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return count;
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}
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static DEVICE_ATTR_RW(events);
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static struct attribute *pvpanic_dev_attrs[] = {
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&dev_attr_capability.attr,
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&dev_attr_events.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(pvpanic_dev);
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MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");
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MODULE_DESCRIPTION("pvpanic device driver");
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MODULE_LICENSE("GPL");
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static void
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pvpanic_send_event(unsigned int event)
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{
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if (event & capability & events)
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iowrite8(event, base);
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}
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static int
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pvpanic_panic_notify(struct notifier_block *nb, unsigned long code,
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void *unused)
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{
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unsigned int event = PVPANIC_PANICKED;
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if (kexec_crash_loaded())
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event = PVPANIC_CRASH_LOADED;
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pvpanic_send_event(event);
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return NOTIFY_DONE;
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}
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static struct notifier_block pvpanic_panic_nb = {
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.notifier_call = pvpanic_panic_notify,
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.priority = 1, /* let this called before broken drm_fb_helper */
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};
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static int pvpanic_mmio_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct resource *res;
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res = platform_get_mem_or_io(pdev, 0);
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if (!res)
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return -EINVAL;
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switch (resource_type(res)) {
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case IORESOURCE_IO:
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base = devm_ioport_map(dev, res->start, resource_size(res));
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if (!base)
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return -ENOMEM;
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break;
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case IORESOURCE_MEM:
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base = devm_ioremap_resource(dev, res);
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if (IS_ERR(base))
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return PTR_ERR(base);
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break;
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default:
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return -EINVAL;
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}
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/* initlize capability by RDPT */
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capability &= ioread8(base);
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events = capability;
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if (capability)
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atomic_notifier_chain_register(&panic_notifier_list,
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&pvpanic_panic_nb);
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return 0;
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}
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static int pvpanic_mmio_remove(struct platform_device *pdev)
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{
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if (capability)
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atomic_notifier_chain_unregister(&panic_notifier_list,
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&pvpanic_panic_nb);
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return 0;
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}
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static const struct of_device_id pvpanic_mmio_match[] = {
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{ .compatible = "qemu,pvpanic-mmio", },
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{}
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};
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MODULE_DEVICE_TABLE(of, pvpanic_mmio_match);
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static const struct acpi_device_id pvpanic_device_ids[] = {
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{ "QEMU0001", 0 },
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{ "", 0 }
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};
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MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
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static struct platform_driver pvpanic_mmio_driver = {
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.driver = {
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.name = "pvpanic-mmio",
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.of_match_table = pvpanic_mmio_match,
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.acpi_match_table = pvpanic_device_ids,
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.dev_groups = pvpanic_dev_groups,
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},
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.probe = pvpanic_mmio_probe,
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.remove = pvpanic_mmio_remove,
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};
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module_platform_driver(pvpanic_mmio_driver);
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