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