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/of.h> 10 #include <linux/pci.h> 11 #include <linux/stat.h> 12 #include <asm/ppc-pci.h> 13 #include <asm/pci-bridge.h> 14 15 /** 16 * EEH_SHOW_ATTR -- Create sysfs entry for eeh statistic 17 * @_name: name of file in sysfs directory 18 * @_memb: name of member in struct eeh_dev to access 19 * @_format: printf format for display 20 * 21 * All of the attributes look very similar, so just 22 * auto-gen a cut-n-paste routine to display them. 23 */ 24 #define EEH_SHOW_ATTR(_name,_memb,_format) \ 25 static ssize_t eeh_show_##_name(struct device *dev, \ 26 struct device_attribute *attr, char *buf) \ 27 { \ 28 struct pci_dev *pdev = to_pci_dev(dev); \ 29 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); \ 30 \ 31 if (!edev) \ 32 return 0; \ 33 \ 34 return sprintf(buf, _format "\n", edev->_memb); \ 35 } \ 36 static DEVICE_ATTR(_name, 0444, eeh_show_##_name, NULL); 37 38 EEH_SHOW_ATTR(eeh_mode, mode, "0x%x"); 39 EEH_SHOW_ATTR(eeh_pe_config_addr, pe_config_addr, "0x%x"); 40 41 static ssize_t eeh_pe_state_show(struct device *dev, 42 struct device_attribute *attr, char *buf) 43 { 44 struct pci_dev *pdev = to_pci_dev(dev); 45 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 46 int state; 47 48 if (!edev || !edev->pe) 49 return -ENODEV; 50 51 state = eeh_ops->get_state(edev->pe, NULL); 52 return sprintf(buf, "0x%08x 0x%08x\n", 53 state, edev->pe->state); 54 } 55 56 static ssize_t eeh_pe_state_store(struct device *dev, 57 struct device_attribute *attr, 58 const char *buf, size_t count) 59 { 60 struct pci_dev *pdev = to_pci_dev(dev); 61 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 62 63 if (!edev || !edev->pe) 64 return -ENODEV; 65 66 /* Nothing to do if it's not frozen */ 67 if (!(edev->pe->state & EEH_PE_ISOLATED)) 68 return count; 69 70 if (eeh_unfreeze_pe(edev->pe)) 71 return -EIO; 72 eeh_pe_state_clear(edev->pe, EEH_PE_ISOLATED, true); 73 74 return count; 75 } 76 77 static DEVICE_ATTR_RW(eeh_pe_state); 78 79 #if defined(CONFIG_PCI_IOV) && defined(CONFIG_PPC_PSERIES) 80 static ssize_t eeh_notify_resume_show(struct device *dev, 81 struct device_attribute *attr, char *buf) 82 { 83 struct pci_dev *pdev = to_pci_dev(dev); 84 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 85 struct pci_dn *pdn = pci_get_pdn(pdev); 86 87 if (!edev || !edev->pe) 88 return -ENODEV; 89 90 return sprintf(buf, "%d\n", pdn->last_allow_rc); 91 } 92 93 static ssize_t eeh_notify_resume_store(struct device *dev, 94 struct device_attribute *attr, 95 const char *buf, size_t count) 96 { 97 struct pci_dev *pdev = to_pci_dev(dev); 98 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 99 100 if (!edev || !edev->pe || !eeh_ops->notify_resume) 101 return -ENODEV; 102 103 if (eeh_ops->notify_resume(edev)) 104 return -EIO; 105 106 return count; 107 } 108 static DEVICE_ATTR_RW(eeh_notify_resume); 109 110 static int eeh_notify_resume_add(struct pci_dev *pdev) 111 { 112 struct device_node *np; 113 int rc = 0; 114 115 np = pci_device_to_OF_node(pdev->is_physfn ? pdev : pdev->physfn); 116 117 if (of_property_read_bool(np, "ibm,is-open-sriov-pf")) 118 rc = device_create_file(&pdev->dev, &dev_attr_eeh_notify_resume); 119 120 return rc; 121 } 122 123 static void eeh_notify_resume_remove(struct pci_dev *pdev) 124 { 125 struct device_node *np; 126 127 np = pci_device_to_OF_node(pdev->is_physfn ? pdev : pdev->physfn); 128 129 if (of_property_read_bool(np, "ibm,is-open-sriov-pf")) 130 device_remove_file(&pdev->dev, &dev_attr_eeh_notify_resume); 131 } 132 #else 133 static inline int eeh_notify_resume_add(struct pci_dev *pdev) { return 0; } 134 static inline void eeh_notify_resume_remove(struct pci_dev *pdev) { } 135 #endif /* CONFIG_PCI_IOV && CONFIG PPC_PSERIES*/ 136 137 void eeh_sysfs_add_device(struct pci_dev *pdev) 138 { 139 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 140 int rc=0; 141 142 if (!eeh_enabled()) 143 return; 144 145 if (edev && (edev->mode & EEH_DEV_SYSFS)) 146 return; 147 148 rc += device_create_file(&pdev->dev, &dev_attr_eeh_mode); 149 rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_config_addr); 150 rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_state); 151 rc += eeh_notify_resume_add(pdev); 152 153 if (rc) 154 pr_warn("EEH: Unable to create sysfs entries\n"); 155 else if (edev) 156 edev->mode |= EEH_DEV_SYSFS; 157 } 158 159 void eeh_sysfs_remove_device(struct pci_dev *pdev) 160 { 161 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 162 163 if (!edev) { 164 WARN_ON(eeh_enabled()); 165 return; 166 } 167 168 edev->mode &= ~EEH_DEV_SYSFS; 169 170 /* 171 * The parent directory might have been removed. We needn't 172 * continue for that case. 173 */ 174 if (!pdev->dev.kobj.sd) 175 return; 176 177 device_remove_file(&pdev->dev, &dev_attr_eeh_mode); 178 device_remove_file(&pdev->dev, &dev_attr_eeh_pe_config_addr); 179 device_remove_file(&pdev->dev, &dev_attr_eeh_pe_state); 180 181 eeh_notify_resume_remove(pdev); 182 } 183