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, S_IRUGO, eeh_show_##_name, NULL); 52 53 EEH_SHOW_ATTR(eeh_mode, mode, "0x%x"); 54 EEH_SHOW_ATTR(eeh_config_addr, config_addr, "0x%x"); 55 EEH_SHOW_ATTR(eeh_pe_config_addr, pe_config_addr, "0x%x"); 56 57 static ssize_t eeh_pe_state_show(struct device *dev, 58 struct device_attribute *attr, char *buf) 59 { 60 struct pci_dev *pdev = to_pci_dev(dev); 61 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 62 int state; 63 64 if (!edev || !edev->pe) 65 return -ENODEV; 66 67 state = eeh_ops->get_state(edev->pe, NULL); 68 return sprintf(buf, "0x%08x 0x%08x\n", 69 state, edev->pe->state); 70 } 71 72 static ssize_t eeh_pe_state_store(struct device *dev, 73 struct device_attribute *attr, 74 const char *buf, size_t count) 75 { 76 struct pci_dev *pdev = to_pci_dev(dev); 77 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 78 79 if (!edev || !edev->pe) 80 return -ENODEV; 81 82 /* Nothing to do if it's not frozen */ 83 if (!(edev->pe->state & EEH_PE_ISOLATED)) 84 return count; 85 86 if (eeh_unfreeze_pe(edev->pe, true)) 87 return -EIO; 88 89 return count; 90 } 91 92 static DEVICE_ATTR_RW(eeh_pe_state); 93 94 void eeh_sysfs_add_device(struct pci_dev *pdev) 95 { 96 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 97 int rc=0; 98 99 if (!eeh_enabled()) 100 return; 101 102 if (edev && (edev->mode & EEH_DEV_SYSFS)) 103 return; 104 105 rc += device_create_file(&pdev->dev, &dev_attr_eeh_mode); 106 rc += device_create_file(&pdev->dev, &dev_attr_eeh_config_addr); 107 rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_config_addr); 108 rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_state); 109 110 if (rc) 111 pr_warn("EEH: Unable to create sysfs entries\n"); 112 else if (edev) 113 edev->mode |= EEH_DEV_SYSFS; 114 } 115 116 void eeh_sysfs_remove_device(struct pci_dev *pdev) 117 { 118 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 119 120 /* 121 * The parent directory might have been removed. We needn't 122 * continue for that case. 123 */ 124 if (!pdev->dev.kobj.sd) { 125 if (edev) 126 edev->mode &= ~EEH_DEV_SYSFS; 127 return; 128 } 129 130 device_remove_file(&pdev->dev, &dev_attr_eeh_mode); 131 device_remove_file(&pdev->dev, &dev_attr_eeh_config_addr); 132 device_remove_file(&pdev->dev, &dev_attr_eeh_pe_config_addr); 133 device_remove_file(&pdev->dev, &dev_attr_eeh_pe_state); 134 135 if (edev) 136 edev->mode &= ~EEH_DEV_SYSFS; 137 } 138