arch/powerpc/kernel/eeh_sysfs.c

   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 void eeh_sysfs_add_device(struct pci_dev *pdev)
  58 {
  59         struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
  60         int rc=0;
  61
  62         if (!eeh_enabled())
  63                 return;
  64
  65         if (edev && (edev->mode & EEH_DEV_SYSFS))
  66                 return;
  67
  68         rc += device_create_file(&pdev->dev, &dev_attr_eeh_mode);
  69         rc += device_create_file(&pdev->dev, &dev_attr_eeh_config_addr);
  70         rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
  71
  72         if (rc)
  73                 printk(KERN_WARNING "EEH: Unable to create sysfs entries\n");
  74         else if (edev)
  75                 edev->mode |= EEH_DEV_SYSFS;
  76 }
  77
  78 void eeh_sysfs_remove_device(struct pci_dev *pdev)
  79 {
  80         struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
  81
  82         /*
  83          * The parent directory might have been removed. We needn't
  84          * continue for that case.
  85          */
  86         if (!pdev->dev.kobj.sd) {
  87                 if (edev)
  88                         edev->mode &= ~EEH_DEV_SYSFS;
  89                 return;
  90         }
  91
  92         device_remove_file(&pdev->dev, &dev_attr_eeh_mode);
  93         device_remove_file(&pdev->dev, &dev_attr_eeh_config_addr);
  94         device_remove_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
  95
  96         if (edev)
  97                 edev->mode &= ~EEH_DEV_SYSFS;
  98 }