1 // SPDX-License-Identifier: GPL-2.0+
3 * Pvpanic PCI Device Support
5 * Copyright (C) 2021 Oracle.
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/pci.h>
11 #include <linux/types.h>
12 #include <linux/slab.h>
14 #include <uapi/misc/pvpanic.h>
18 #define PCI_VENDOR_ID_REDHAT 0x1b36
19 #define PCI_DEVICE_ID_REDHAT_PVPANIC 0x0011
21 MODULE_AUTHOR("Mihai Carabas <mihai.carabas@oracle.com>");
22 MODULE_DESCRIPTION("pvpanic device driver ");
23 MODULE_LICENSE("GPL");
25 static const struct pci_device_id pvpanic_pci_id_tbl[] = {
26 { PCI_DEVICE(PCI_VENDOR_ID_REDHAT, PCI_DEVICE_ID_REDHAT_PVPANIC)},
30 static ssize_t capability_show(struct device *dev,
31 struct device_attribute *attr, char *buf)
33 struct pvpanic_instance *pi = dev_get_drvdata(dev);
35 return sysfs_emit(buf, "%x\n", pi->capability);
37 static DEVICE_ATTR_RO(capability);
39 static ssize_t events_show(struct device *dev, struct device_attribute *attr, char *buf)
41 struct pvpanic_instance *pi = dev_get_drvdata(dev);
43 return sysfs_emit(buf, "%x\n", pi->events);
46 static ssize_t events_store(struct device *dev, struct device_attribute *attr,
47 const char *buf, size_t count)
49 struct pvpanic_instance *pi = dev_get_drvdata(dev);
53 err = kstrtouint(buf, 16, &tmp);
57 if ((tmp & pi->capability) != tmp)
64 static DEVICE_ATTR_RW(events);
66 static struct attribute *pvpanic_pci_dev_attrs[] = {
67 &dev_attr_capability.attr,
68 &dev_attr_events.attr,
71 ATTRIBUTE_GROUPS(pvpanic_pci_dev);
73 static int pvpanic_pci_probe(struct pci_dev *pdev,
74 const struct pci_device_id *ent)
76 struct device *dev = &pdev->dev;
77 struct pvpanic_instance *pi;
81 ret = pci_enable_device(pdev);
85 base = pci_iomap(pdev, 0, 0);
89 pi = kmalloc(sizeof(*pi), GFP_ATOMIC);
94 pi->capability = PVPANIC_PANICKED | PVPANIC_CRASH_LOADED;
96 /* initlize capability by RDPT */
97 pi->capability &= ioread8(base);
98 pi->events = pi->capability;
100 dev_set_drvdata(dev, pi);
102 return pvpanic_probe(pi);
105 static void pvpanic_pci_remove(struct pci_dev *pdev)
107 struct pvpanic_instance *pi = dev_get_drvdata(&pdev->dev);
112 pci_disable_device(pdev);
115 static struct pci_driver pvpanic_pci_driver = {
116 .name = "pvpanic-pci",
117 .id_table = pvpanic_pci_id_tbl,
118 .probe = pvpanic_pci_probe,
119 .remove = pvpanic_pci_remove,
121 .dev_groups = pvpanic_pci_dev_groups,
125 module_pci_driver(pvpanic_pci_driver);