1 /* 2 * Sysfs entries for PCI Error Recovery for PAPR-compliant platform. 3 * Copyright IBM Corporation 2007 4 * Copyright Linas Vepstas <linas@austin.ibm.com> 2007 5 * 6 * All rights reserved. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or (at 11 * your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 16 * NON INFRINGEMENT. See the GNU General Public License for more 17 * details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22 * 23 * Send comments and feedback to Linas Vepstas <linas@austin.ibm.com> 24 */ 25 #include <linux/pci.h> 26 #include <linux/stat.h> 27 #include <asm/ppc-pci.h> 28 #include <asm/pci-bridge.h> 29 30 /** 31 * EEH_SHOW_ATTR -- Create sysfs entry for eeh statistic 32 * @_name: name of file in sysfs directory 33 * @_memb: name of member in struct pci_dn to access 34 * @_format: printf format for display 35 * 36 * All of the attributes look very similar, so just 37 * auto-gen a cut-n-paste routine to display them. 38 */ 39 #define EEH_SHOW_ATTR(_name,_memb,_format) \ 40 static ssize_t eeh_show_##_name(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 \ 46 if (!edev) \ 47 return 0; \ 48 \ 49 return sprintf(buf, _format "\n", edev->_memb); \ 50 } \ 51 static DEVICE_ATTR(_name, 0444, eeh_show_##_name, NULL); 52 53 EEH_SHOW_ATTR(eeh_mode, mode, "0x%x"); 54 EEH_SHOW_ATTR(eeh_pe_config_addr, pe_config_addr, "0x%x"); 55 56 static ssize_t eeh_pe_state_show(struct device *dev, 57 struct device_attribute *attr, char *buf) 58 { 59 struct pci_dev *pdev = to_pci_dev(dev); 60 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 61 int state; 62 63 if (!edev || !edev->pe) 64 return -ENODEV; 65 66 state = eeh_ops->get_state(edev->pe, NULL); 67 return sprintf(buf, "0x%08x 0x%08x\n", 68 state, edev->pe->state); 69 } 70 71 static ssize_t eeh_pe_state_store(struct device *dev, 72 struct device_attribute *attr, 73 const char *buf, size_t count) 74 { 75 struct pci_dev *pdev = to_pci_dev(dev); 76 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 77 78 if (!edev || !edev->pe) 79 return -ENODEV; 80 81 /* Nothing to do if it's not frozen */ 82 if (!(edev->pe->state & EEH_PE_ISOLATED)) 83 return count; 84 85 if (eeh_unfreeze_pe(edev->pe)) 86 return -EIO; 87 eeh_pe_state_clear(edev->pe, EEH_PE_ISOLATED, true); 88 89 return count; 90 } 91 92 static DEVICE_ATTR_RW(eeh_pe_state); 93 94 #ifdef CONFIG_PCI_IOV 95 static ssize_t eeh_notify_resume_show(struct device *dev, 96 struct device_attribute *attr, char *buf) 97 { 98 struct pci_dev *pdev = to_pci_dev(dev); 99 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 100 struct pci_dn *pdn = pci_get_pdn(pdev); 101 102 if (!edev || !edev->pe) 103 return -ENODEV; 104 105 pdn = pci_get_pdn(pdev); 106 return sprintf(buf, "%d\n", pdn->last_allow_rc); 107 } 108 109 static ssize_t eeh_notify_resume_store(struct device *dev, 110 struct device_attribute *attr, 111 const char *buf, size_t count) 112 { 113 struct pci_dev *pdev = to_pci_dev(dev); 114 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 115 116 if (!edev || !edev->pe || !eeh_ops->notify_resume) 117 return -ENODEV; 118 119 if (eeh_ops->notify_resume(pci_get_pdn(pdev))) 120 return -EIO; 121 122 return count; 123 } 124 static DEVICE_ATTR_RW(eeh_notify_resume); 125 126 static int eeh_notify_resume_add(struct pci_dev *pdev) 127 { 128 struct device_node *np; 129 int rc = 0; 130 131 np = pci_device_to_OF_node(pdev->is_physfn ? pdev : pdev->physfn); 132 133 if (of_property_read_bool(np, "ibm,is-open-sriov-pf")) 134 rc = device_create_file(&pdev->dev, &dev_attr_eeh_notify_resume); 135 136 return rc; 137 } 138 139 static void eeh_notify_resume_remove(struct pci_dev *pdev) 140 { 141 struct device_node *np; 142 143 np = pci_device_to_OF_node(pdev->is_physfn ? pdev : pdev->physfn); 144 145 if (of_property_read_bool(np, "ibm,is-open-sriov-pf")) 146 device_remove_file(&pdev->dev, &dev_attr_eeh_notify_resume); 147 } 148 #else 149 static inline int eeh_notify_resume_add(struct pci_dev *pdev) { return 0; } 150 static inline void eeh_notify_resume_remove(struct pci_dev *pdev) { } 151 #endif /* CONFIG_PCI_IOV */ 152 153 void eeh_sysfs_add_device(struct pci_dev *pdev) 154 { 155 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 156 int rc=0; 157 158 if (!eeh_enabled()) 159 return; 160 161 if (edev && (edev->mode & EEH_DEV_SYSFS)) 162 return; 163 164 rc += device_create_file(&pdev->dev, &dev_attr_eeh_mode); 165 rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_config_addr); 166 rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_state); 167 rc += eeh_notify_resume_add(pdev); 168 169 if (rc) 170 pr_warn("EEH: Unable to create sysfs entries\n"); 171 else if (edev) 172 edev->mode |= EEH_DEV_SYSFS; 173 } 174 175 void eeh_sysfs_remove_device(struct pci_dev *pdev) 176 { 177 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 178 179 /* 180 * The parent directory might have been removed. We needn't 181 * continue for that case. 182 */ 183 if (!pdev->dev.kobj.sd) { 184 if (edev) 185 edev->mode &= ~EEH_DEV_SYSFS; 186 return; 187 } 188 189 device_remove_file(&pdev->dev, &dev_attr_eeh_mode); 190 device_remove_file(&pdev->dev, &dev_attr_eeh_pe_config_addr); 191 device_remove_file(&pdev->dev, &dev_attr_eeh_pe_state); 192 193 eeh_notify_resume_remove(pdev); 194 195 if (edev) 196 edev->mode &= ~EEH_DEV_SYSFS; 197 } 198