1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Sysfs entries for PCI Error Recovery for PAPR-compliant platform. 4 * Copyright IBM Corporation 2007 5 * Copyright Linas Vepstas <linas@austin.ibm.com> 2007 6 * 7 * Send comments and feedback to Linas Vepstas <linas@austin.ibm.com> 8 */ 9 #include <linux/pci.h> 10 #include <linux/stat.h> 11 #include <asm/ppc-pci.h> 12 #include <asm/pci-bridge.h> 13 14 /** 15 * EEH_SHOW_ATTR -- Create sysfs entry for eeh statistic 16 * @_name: name of file in sysfs directory 17 * @_memb: name of member in struct eeh_dev to access 18 * @_format: printf format for display 19 * 20 * All of the attributes look very similar, so just 21 * auto-gen a cut-n-paste routine to display them. 22 */ 23 #define EEH_SHOW_ATTR(_name,_memb,_format) \ 24 static ssize_t eeh_show_##_name(struct device *dev, \ 25 struct device_attribute *attr, char *buf) \ 26 { \ 27 struct pci_dev *pdev = to_pci_dev(dev); \ 28 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); \ 29 \ 30 if (!edev) \ 31 return 0; \ 32 \ 33 return sprintf(buf, _format "\n", edev->_memb); \ 34 } \ 35 static DEVICE_ATTR(_name, 0444, eeh_show_##_name, NULL); 36 37 EEH_SHOW_ATTR(eeh_mode, mode, "0x%x"); 38 EEH_SHOW_ATTR(eeh_pe_config_addr, pe_config_addr, "0x%x"); 39 40 static ssize_t eeh_pe_state_show(struct device *dev, 41 struct device_attribute *attr, char *buf) 42 { 43 struct pci_dev *pdev = to_pci_dev(dev); 44 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 45 int state; 46 47 if (!edev || !edev->pe) 48 return -ENODEV; 49 50 state = eeh_ops->get_state(edev->pe, NULL); 51 return sprintf(buf, "0x%08x 0x%08x\n", 52 state, edev->pe->state); 53 } 54 55 static ssize_t eeh_pe_state_store(struct device *dev, 56 struct device_attribute *attr, 57 const char *buf, size_t count) 58 { 59 struct pci_dev *pdev = to_pci_dev(dev); 60 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 61 62 if (!edev || !edev->pe) 63 return -ENODEV; 64 65 /* Nothing to do if it's not frozen */ 66 if (!(edev->pe->state & EEH_PE_ISOLATED)) 67 return count; 68 69 if (eeh_unfreeze_pe(edev->pe)) 70 return -EIO; 71 eeh_pe_state_clear(edev->pe, EEH_PE_ISOLATED, true); 72 73 return count; 74 } 75 76 static DEVICE_ATTR_RW(eeh_pe_state); 77 78 #if defined(CONFIG_PCI_IOV) && defined(CONFIG_PPC_PSERIES) 79 static ssize_t eeh_notify_resume_show(struct device *dev, 80 struct device_attribute *attr, char *buf) 81 { 82 struct pci_dev *pdev = to_pci_dev(dev); 83 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 84 struct pci_dn *pdn = pci_get_pdn(pdev); 85 86 if (!edev || !edev->pe) 87 return -ENODEV; 88 89 return sprintf(buf, "%d\n", pdn->last_allow_rc); 90 } 91 92 static ssize_t eeh_notify_resume_store(struct device *dev, 93 struct device_attribute *attr, 94 const char *buf, size_t count) 95 { 96 struct pci_dev *pdev = to_pci_dev(dev); 97 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 98 99 if (!edev || !edev->pe || !eeh_ops->notify_resume) 100 return -ENODEV; 101 102 if (eeh_ops->notify_resume(edev)) 103 return -EIO; 104 105 return count; 106 } 107 static DEVICE_ATTR_RW(eeh_notify_resume); 108 109 static int eeh_notify_resume_add(struct pci_dev *pdev) 110 { 111 struct device_node *np; 112 int rc = 0; 113 114 np = pci_device_to_OF_node(pdev->is_physfn ? pdev : pdev->physfn); 115 116 if (of_property_read_bool(np, "ibm,is-open-sriov-pf")) 117 rc = device_create_file(&pdev->dev, &dev_attr_eeh_notify_resume); 118 119 return rc; 120 } 121 122 static void eeh_notify_resume_remove(struct pci_dev *pdev) 123 { 124 struct device_node *np; 125 126 np = pci_device_to_OF_node(pdev->is_physfn ? pdev : pdev->physfn); 127 128 if (of_property_read_bool(np, "ibm,is-open-sriov-pf")) 129 device_remove_file(&pdev->dev, &dev_attr_eeh_notify_resume); 130 } 131 #else 132 static inline int eeh_notify_resume_add(struct pci_dev *pdev) { return 0; } 133 static inline void eeh_notify_resume_remove(struct pci_dev *pdev) { } 134 #endif /* CONFIG_PCI_IOV && CONFIG PPC_PSERIES*/ 135 136 void eeh_sysfs_add_device(struct pci_dev *pdev) 137 { 138 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 139 int rc=0; 140 141 if (!eeh_enabled()) 142 return; 143 144 if (edev && (edev->mode & EEH_DEV_SYSFS)) 145 return; 146 147 rc += device_create_file(&pdev->dev, &dev_attr_eeh_mode); 148 rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_config_addr); 149 rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_state); 150 rc += eeh_notify_resume_add(pdev); 151 152 if (rc) 153 pr_warn("EEH: Unable to create sysfs entries\n"); 154 else if (edev) 155 edev->mode |= EEH_DEV_SYSFS; 156 } 157 158 void eeh_sysfs_remove_device(struct pci_dev *pdev) 159 { 160 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 161 162 if (!edev) { 163 WARN_ON(eeh_enabled()); 164 return; 165 } 166 167 edev->mode &= ~EEH_DEV_SYSFS; 168 169 /* 170 * The parent directory might have been removed. We needn't 171 * continue for that case. 172 */ 173 if (!pdev->dev.kobj.sd) 174 return; 175 176 device_remove_file(&pdev->dev, &dev_attr_eeh_mode); 177 device_remove_file(&pdev->dev, &dev_attr_eeh_pe_config_addr); 178 device_remove_file(&pdev->dev, &dev_attr_eeh_pe_state); 179 180 eeh_notify_resume_remove(pdev); 181 } 182