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