110 lines
2.4 KiB
C
110 lines
2.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Pvpanic PCI Device Support
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*
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* Copyright (C) 2021 Oracle.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <uapi/misc/pvpanic.h>
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#include "pvpanic.h"
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#define PCI_VENDOR_ID_REDHAT 0x1b36
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#define PCI_DEVICE_ID_REDHAT_PVPANIC 0x0011
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MODULE_AUTHOR("Mihai Carabas <mihai.carabas@oracle.com>");
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MODULE_DESCRIPTION("pvpanic device driver");
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MODULE_LICENSE("GPL");
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static ssize_t capability_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct pvpanic_instance *pi = dev_get_drvdata(dev);
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return sysfs_emit(buf, "%x\n", pi->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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struct pvpanic_instance *pi = dev_get_drvdata(dev);
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return sysfs_emit(buf, "%x\n", pi->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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struct pvpanic_instance *pi = dev_get_drvdata(dev);
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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 & pi->capability) != tmp)
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return -EINVAL;
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pi->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_pci_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_pci_dev);
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static int pvpanic_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
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{
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struct pvpanic_instance *pi;
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void __iomem *base;
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int ret;
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ret = pcim_enable_device(pdev);
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if (ret < 0)
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return ret;
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base = pcim_iomap(pdev, 0, 0);
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if (!base)
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return -ENOMEM;
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pi = devm_kmalloc(&pdev->dev, sizeof(*pi), GFP_KERNEL);
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if (!pi)
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return -ENOMEM;
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pi->base = base;
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pi->capability = PVPANIC_PANICKED | PVPANIC_CRASH_LOADED;
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/* initlize capability by RDPT */
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pi->capability &= ioread8(base);
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pi->events = pi->capability;
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return devm_pvpanic_probe(&pdev->dev, pi);
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}
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static const struct pci_device_id pvpanic_pci_id_tbl[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_REDHAT, PCI_DEVICE_ID_REDHAT_PVPANIC)},
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{}
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};
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MODULE_DEVICE_TABLE(pci, pvpanic_pci_id_tbl);
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static struct pci_driver pvpanic_pci_driver = {
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.name = "pvpanic-pci",
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.id_table = pvpanic_pci_id_tbl,
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.probe = pvpanic_pci_probe,
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.driver = {
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.dev_groups = pvpanic_pci_dev_groups,
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},
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};
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module_pci_driver(pvpanic_pci_driver);
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