LXR linux/arch/powerpc/kernel/eeh

   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)               \
  40static 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}                                                        \
  51static DEVICE_ATTR(_name, S_IRUGO, eeh_show_##_name, NULL);
  52
  53EEH_SHOW_ATTR(eeh_mode,            mode,            "0x%x");
  54EEH_SHOW_ATTR(eeh_config_addr,     config_addr,     "0x%x");
  55EEH_SHOW_ATTR(eeh_pe_config_addr,  pe_config_addr,  "0x%x");
  56
  57void 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 (edev && (edev->mode & EEH_DEV_SYSFS))
  63                return;
  64
  65        rc += device_create_file(&pdev->dev, &dev_attr_eeh_mode);
  66        rc += device_create_file(&pdev->dev, &dev_attr_eeh_config_addr);
  67        rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
  68
  69        if (rc)
  70                printk(KERN_WARNING "EEH: Unable to create sysfs entries\n");
  71        else if (edev)
  72                edev->mode |= EEH_DEV_SYSFS;
  73}
  74
  75void eeh_sysfs_remove_device(struct pci_dev *pdev)
  76{
  77        struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
  78
  79        /*
  80         * The parent directory might have been removed. We needn't
  81         * continue for that case.
  82         */
  83        if (!pdev->dev.kobj.sd) {
  84                if (edev)
  85                        edev->mode &= ~EEH_DEV_SYSFS;
  86                return;
  87        }
  88
  89        device_remove_file(&pdev->dev, &dev_attr_eeh_mode);
  90        device_remove_file(&pdev->dev, &dev_attr_eeh_config_addr);
  91        device_remove_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
  92
  93        if (edev)
  94                edev->mode &= ~EEH_DEV_SYSFS;
  95}
  96