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Linux/arch/powerpc/kernel/eeh_sysfs.c

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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 /**
 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 

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