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 ssize_t capability_show(struct device *dev, 26 struct device_attribute *attr, char *buf) 27 { 28 struct pvpanic_instance *pi = dev_get_drvdata(dev); 29 30 return sysfs_emit(buf, "%x\n", pi->capability); 31 } 32 static DEVICE_ATTR_RO(capability); 33 34 static ssize_t events_show(struct device *dev, struct device_attribute *attr, char *buf) 35 { 36 struct pvpanic_instance *pi = dev_get_drvdata(dev); 37 38 return sysfs_emit(buf, "%x\n", pi->events); 39 } 40 41 static ssize_t events_store(struct device *dev, struct device_attribute *attr, 42 const char *buf, size_t count) 43 { 44 struct pvpanic_instance *pi = dev_get_drvdata(dev); 45 unsigned int tmp; 46 int err; 47 48 err = kstrtouint(buf, 16, &tmp); 49 if (err) 50 return err; 51 52 if ((tmp & pi->capability) != tmp) 53 return -EINVAL; 54 55 pi->events = tmp; 56 57 return count; 58 } 59 static DEVICE_ATTR_RW(events); 60 61 static struct attribute *pvpanic_pci_dev_attrs[] = { 62 &dev_attr_capability.attr, 63 &dev_attr_events.attr, 64 NULL 65 }; 66 ATTRIBUTE_GROUPS(pvpanic_pci_dev); 67 68 static int pvpanic_pci_probe(struct pci_dev *pdev, 69 const struct pci_device_id *ent) 70 { 71 struct pvpanic_instance *pi; 72 void __iomem *base; 73 int ret; 74 75 ret = pcim_enable_device(pdev); 76 if (ret < 0) 77 return ret; 78 79 base = pcim_iomap(pdev, 0, 0); 80 if (!base) 81 return -ENOMEM; 82 83 pi = devm_kmalloc(&pdev->dev, sizeof(*pi), GFP_KERNEL); 84 if (!pi) 85 return -ENOMEM; 86 87 pi->base = base; 88 pi->capability = PVPANIC_PANICKED | PVPANIC_CRASH_LOADED; 89 90 /* initlize capability by RDPT */ 91 pi->capability &= ioread8(base); 92 pi->events = pi->capability; 93 94 return devm_pvpanic_probe(&pdev->dev, pi); 95 } 96 97 static const struct pci_device_id pvpanic_pci_id_tbl[] = { 98 { PCI_DEVICE(PCI_VENDOR_ID_REDHAT, PCI_DEVICE_ID_REDHAT_PVPANIC)}, 99 {} 100 }; 101 MODULE_DEVICE_TABLE(pci, pvpanic_pci_id_tbl); 102 103 static struct pci_driver pvpanic_pci_driver = { 104 .name = "pvpanic-pci", 105 .id_table = pvpanic_pci_id_tbl, 106 .probe = pvpanic_pci_probe, 107 .driver = { 108 .dev_groups = pvpanic_pci_dev_groups, 109 }, 110 }; 111 module_pci_driver(pvpanic_pci_driver); 112