eeh_sysfs.c 4.2 KB

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  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. * EEH_SHOW_ATTR -- Create sysfs entry for eeh statistic
  31. * @_name: name of file in sysfs directory
  32. * @_memb: name of member in struct pci_dn to access
  33. * @_format: printf format for display
  34. *
  35. * All of the attributes look very similar, so just
  36. * auto-gen a cut-n-paste routine to display them.
  37. */
  38. #define EEH_SHOW_ATTR(_name,_memb,_format) \
  39. static ssize_t eeh_show_##_name(struct device *dev, \
  40. struct device_attribute *attr, char *buf) \
  41. { \
  42. struct pci_dev *pdev = to_pci_dev(dev); \
  43. struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); \
  44. \
  45. if (!edev) \
  46. return 0; \
  47. \
  48. return sprintf(buf, _format "\n", edev->_memb); \
  49. } \
  50. static DEVICE_ATTR(_name, S_IRUGO, eeh_show_##_name, NULL);
  51. EEH_SHOW_ATTR(eeh_mode, mode, "0x%x");
  52. EEH_SHOW_ATTR(eeh_config_addr, config_addr, "0x%x");
  53. EEH_SHOW_ATTR(eeh_pe_config_addr, pe_config_addr, "0x%x");
  54. static ssize_t eeh_pe_state_show(struct device *dev,
  55. struct device_attribute *attr, char *buf)
  56. {
  57. struct pci_dev *pdev = to_pci_dev(dev);
  58. struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
  59. int state;
  60. if (!edev || !edev->pe)
  61. return -ENODEV;
  62. state = eeh_ops->get_state(edev->pe, NULL);
  63. return sprintf(buf, "0x%08x 0x%08x\n",
  64. state, edev->pe->state);
  65. }
  66. static ssize_t eeh_pe_state_store(struct device *dev,
  67. struct device_attribute *attr,
  68. const char *buf, size_t count)
  69. {
  70. struct pci_dev *pdev = to_pci_dev(dev);
  71. struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
  72. if (!edev || !edev->pe)
  73. return -ENODEV;
  74. /* Nothing to do if it's not frozen */
  75. if (!(edev->pe->state & EEH_PE_ISOLATED))
  76. return count;
  77. if (eeh_unfreeze_pe(edev->pe, true))
  78. return -EIO;
  79. return count;
  80. }
  81. static DEVICE_ATTR_RW(eeh_pe_state);
  82. void eeh_sysfs_add_device(struct pci_dev *pdev)
  83. {
  84. struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
  85. int rc=0;
  86. if (!eeh_enabled())
  87. return;
  88. if (edev && (edev->mode & EEH_DEV_SYSFS))
  89. return;
  90. rc += device_create_file(&pdev->dev, &dev_attr_eeh_mode);
  91. rc += device_create_file(&pdev->dev, &dev_attr_eeh_config_addr);
  92. rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
  93. rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_state);
  94. if (rc)
  95. pr_warn("EEH: Unable to create sysfs entries\n");
  96. else if (edev)
  97. edev->mode |= EEH_DEV_SYSFS;
  98. }
  99. void eeh_sysfs_remove_device(struct pci_dev *pdev)
  100. {
  101. struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
  102. /*
  103. * The parent directory might have been removed. We needn't
  104. * continue for that case.
  105. */
  106. if (!pdev->dev.kobj.sd) {
  107. if (edev)
  108. edev->mode &= ~EEH_DEV_SYSFS;
  109. return;
  110. }
  111. device_remove_file(&pdev->dev, &dev_attr_eeh_mode);
  112. device_remove_file(&pdev->dev, &dev_attr_eeh_config_addr);
  113. device_remove_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
  114. device_remove_file(&pdev->dev, &dev_attr_eeh_pe_state);
  115. if (edev)
  116. edev->mode &= ~EEH_DEV_SYSFS;
  117. }