1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Pvpanic PCI Device Support 4 * 5 * Copyright (C) 2021 Oracle. 6 */ 7 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> 13 14 #include <uapi/misc/pvpanic.h> 15 16 #include "pvpanic.h" 17 18 #define PCI_VENDOR_ID_REDHAT 0x1b36 19 #define PCI_DEVICE_ID_REDHAT_PVPANIC 0x0011 20 21 MODULE_AUTHOR("Mihai Carabas <mihai.carabas@oracle.com>"); 22 MODULE_DESCRIPTION("pvpanic device driver "); 23 MODULE_LICENSE("GPL"); 24 25 static const struct pci_device_id pvpanic_pci_id_tbl[] = { 26 { PCI_DEVICE(PCI_VENDOR_ID_REDHAT, PCI_DEVICE_ID_REDHAT_PVPANIC)}, 27 {} 28 }; 29 30 static ssize_t capability_show(struct device *dev, 31 struct device_attribute *attr, char *buf) 32 { 33 struct pvpanic_instance *pi = dev_get_drvdata(dev); 34 35 return sysfs_emit(buf, "%x\n", pi->capability); 36 } 37 static DEVICE_ATTR_RO(capability); 38 39 static ssize_t events_show(struct device *dev, struct device_attribute *attr, char *buf) 40 { 41 struct pvpanic_instance *pi = dev_get_drvdata(dev); 42 43 return sysfs_emit(buf, "%x\n", pi->events); 44 } 45 46 static ssize_t events_store(struct device *dev, struct device_attribute *attr, 47 const char *buf, size_t count) 48 { 49 struct pvpanic_instance *pi = dev_get_drvdata(dev); 50 unsigned int tmp; 51 int err; 52 53 err = kstrtouint(buf, 16, &tmp); 54 if (err) 55 return err; 56 57 if ((tmp & pi->capability) != tmp) 58 return -EINVAL; 59 60 pi->events = tmp; 61 62 return count; 63 } 64 static DEVICE_ATTR_RW(events); 65 66 static struct attribute *pvpanic_pci_dev_attrs[] = { 67 &dev_attr_capability.attr, 68 &dev_attr_events.attr, 69 NULL 70 }; 71 ATTRIBUTE_GROUPS(pvpanic_pci_dev); 72 73 static int pvpanic_pci_probe(struct pci_dev *pdev, 74 const struct pci_device_id *ent) 75 { 76 struct device *dev = &pdev->dev; 77 struct pvpanic_instance *pi; 78 void __iomem *base; 79 int ret; 80 81 ret = pci_enable_device(pdev); 82 if (ret < 0) 83 return ret; 84 85 base = pci_iomap(pdev, 0, 0); 86 if (!base) 87 return -ENOMEM; 88 89 pi = kmalloc(sizeof(*pi), GFP_ATOMIC); 90 if (!pi) 91 return -ENOMEM; 92 93 pi->base = base; 94 pi->capability = PVPANIC_PANICKED | PVPANIC_CRASH_LOADED; 95 96 /* initlize capability by RDPT */ 97 pi->capability &= ioread8(base); 98 pi->events = pi->capability; 99 100 dev_set_drvdata(dev, pi); 101 102 return pvpanic_probe(pi); 103 } 104 105 static void pvpanic_pci_remove(struct pci_dev *pdev) 106 { 107 struct pvpanic_instance *pi = dev_get_drvdata(&pdev->dev); 108 109 pvpanic_remove(pi); 110 iounmap(pi->base); 111 kfree(pi); 112 pci_disable_device(pdev); 113 } 114 115 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, 120 .driver = { 121 .dev_groups = pvpanic_pci_dev_groups, 122 }, 123 }; 124 125 module_pci_driver(pvpanic_pci_driver); 126