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
eeh_pe_state_show(struct device * dev,struct device_attribute * attr,char * buf)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
eeh_pe_state_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)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
eeh_sysfs_add_device(struct pci_dev * pdev)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
eeh_sysfs_remove_device(struct pci_dev * pdev)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