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, 0444, eeh_show_##_name, NULL);
52
53 EEH_SHOW_ATTR(eeh_mode, mode, "0x%x");
54 EEH_SHOW_ATTR(eeh_pe_config_addr, pe_config_addr, "0x%x");
55
eeh_pe_state_show(struct device * dev,struct device_attribute * attr,char * buf)56 static ssize_t eeh_pe_state_show(struct device *dev,
57 struct device_attribute *attr, char *buf)
58 {
59 struct pci_dev *pdev = to_pci_dev(dev);
60 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
61 int state;
62
63 if (!edev || !edev->pe)
64 return -ENODEV;
65
66 state = eeh_ops->get_state(edev->pe, NULL);
67 return sprintf(buf, "0x%08x 0x%08x\n",
68 state, edev->pe->state);
69 }
70
eeh_pe_state_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)71 static ssize_t eeh_pe_state_store(struct device *dev,
72 struct device_attribute *attr,
73 const char *buf, size_t count)
74 {
75 struct pci_dev *pdev = to_pci_dev(dev);
76 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
77
78 if (!edev || !edev->pe)
79 return -ENODEV;
80
81 /* Nothing to do if it's not frozen */
82 if (!(edev->pe->state & EEH_PE_ISOLATED))
83 return count;
84
85 if (eeh_unfreeze_pe(edev->pe, true))
86 return -EIO;
87
88 return count;
89 }
90
91 static DEVICE_ATTR_RW(eeh_pe_state);
92
93 #ifdef CONFIG_PCI_IOV
eeh_notify_resume_show(struct device * dev,struct device_attribute * attr,char * buf)94 static ssize_t eeh_notify_resume_show(struct device *dev,
95 struct device_attribute *attr, char *buf)
96 {
97 struct pci_dev *pdev = to_pci_dev(dev);
98 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
99 struct pci_dn *pdn = pci_get_pdn(pdev);
100
101 if (!edev || !edev->pe)
102 return -ENODEV;
103
104 pdn = pci_get_pdn(pdev);
105 return sprintf(buf, "%d\n", pdn->last_allow_rc);
106 }
107
eeh_notify_resume_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)108 static ssize_t eeh_notify_resume_store(struct device *dev,
109 struct device_attribute *attr,
110 const char *buf, size_t count)
111 {
112 struct pci_dev *pdev = to_pci_dev(dev);
113 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
114
115 if (!edev || !edev->pe || !eeh_ops->notify_resume)
116 return -ENODEV;
117
118 if (eeh_ops->notify_resume(pci_get_pdn(pdev)))
119 return -EIO;
120
121 return count;
122 }
123 static DEVICE_ATTR_RW(eeh_notify_resume);
124
eeh_notify_resume_add(struct pci_dev * pdev)125 static int eeh_notify_resume_add(struct pci_dev *pdev)
126 {
127 struct device_node *np;
128 int rc = 0;
129
130 np = pci_device_to_OF_node(pdev->is_physfn ? pdev : pdev->physfn);
131
132 if (of_property_read_bool(np, "ibm,is-open-sriov-pf"))
133 rc = device_create_file(&pdev->dev, &dev_attr_eeh_notify_resume);
134
135 return rc;
136 }
137
eeh_notify_resume_remove(struct pci_dev * pdev)138 static void eeh_notify_resume_remove(struct pci_dev *pdev)
139 {
140 struct device_node *np;
141
142 np = pci_device_to_OF_node(pdev->is_physfn ? pdev : pdev->physfn);
143
144 if (of_property_read_bool(np, "ibm,is-open-sriov-pf"))
145 device_remove_file(&pdev->dev, &dev_attr_eeh_notify_resume);
146 }
147 #else
eeh_notify_resume_add(struct pci_dev * pdev)148 static inline int eeh_notify_resume_add(struct pci_dev *pdev) { return 0; }
eeh_notify_resume_remove(struct pci_dev * pdev)149 static inline void eeh_notify_resume_remove(struct pci_dev *pdev) { }
150 #endif /* CONFIG_PCI_IOV */
151
eeh_sysfs_add_device(struct pci_dev * pdev)152 void eeh_sysfs_add_device(struct pci_dev *pdev)
153 {
154 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
155 int rc=0;
156
157 if (!eeh_enabled())
158 return;
159
160 if (edev && (edev->mode & EEH_DEV_SYSFS))
161 return;
162
163 rc += device_create_file(&pdev->dev, &dev_attr_eeh_mode);
164 rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
165 rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_state);
166 rc += eeh_notify_resume_add(pdev);
167
168 if (rc)
169 pr_warn("EEH: Unable to create sysfs entries\n");
170 else if (edev)
171 edev->mode |= EEH_DEV_SYSFS;
172 }
173
eeh_sysfs_remove_device(struct pci_dev * pdev)174 void eeh_sysfs_remove_device(struct pci_dev *pdev)
175 {
176 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
177
178 /*
179 * The parent directory might have been removed. We needn't
180 * continue for that case.
181 */
182 if (!pdev->dev.kobj.sd) {
183 if (edev)
184 edev->mode &= ~EEH_DEV_SYSFS;
185 return;
186 }
187
188 device_remove_file(&pdev->dev, &dev_attr_eeh_mode);
189 device_remove_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
190 device_remove_file(&pdev->dev, &dev_attr_eeh_pe_state);
191
192 eeh_notify_resume_remove(pdev);
193
194 if (edev)
195 edev->mode &= ~EEH_DEV_SYSFS;
196 }
197
