1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Sysfs entries for PCI Error Recovery for PAPR-compliant platform.
4 * Copyright IBM Corporation 2007
5 * Copyright Linas Vepstas <linas@austin.ibm.com> 2007
6 *
7 * Send comments and feedback to Linas Vepstas <linas@austin.ibm.com>
8 */
9 #include <linux/of.h>
10 #include <linux/pci.h>
11 #include <linux/stat.h>
12 #include <asm/ppc-pci.h>
13 #include <asm/pci-bridge.h>
14
15 /**
16 * EEH_SHOW_ATTR -- Create sysfs entry for eeh statistic
17 * @_name: name of file in sysfs directory
18 * @_memb: name of member in struct eeh_dev to access
19 * @_format: printf format for display
20 *
21 * All of the attributes look very similar, so just
22 * auto-gen a cut-n-paste routine to display them.
23 */
24 #define EEH_SHOW_ATTR(_name,_memb,_format) \
25 static ssize_t eeh_show_##_name(struct device *dev, \
26 struct device_attribute *attr, char *buf) \
27 { \
28 struct pci_dev *pdev = to_pci_dev(dev); \
29 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); \
30 \
31 if (!edev) \
32 return 0; \
33 \
34 return sprintf(buf, _format "\n", edev->_memb); \
35 } \
36 static DEVICE_ATTR(_name, 0444, eeh_show_##_name, NULL);
37
38 EEH_SHOW_ATTR(eeh_mode, mode, "0x%x");
39 EEH_SHOW_ATTR(eeh_pe_config_addr, pe_config_addr, "0x%x");
40
eeh_pe_state_show(struct device * dev,struct device_attribute * attr,char * buf)41 static ssize_t eeh_pe_state_show(struct device *dev,
42 struct device_attribute *attr, char *buf)
43 {
44 struct pci_dev *pdev = to_pci_dev(dev);
45 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
46 int state;
47
48 if (!edev || !edev->pe)
49 return -ENODEV;
50
51 state = eeh_ops->get_state(edev->pe, NULL);
52 return sprintf(buf, "0x%08x 0x%08x\n",
53 state, edev->pe->state);
54 }
55
eeh_pe_state_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)56 static ssize_t eeh_pe_state_store(struct device *dev,
57 struct device_attribute *attr,
58 const char *buf, size_t count)
59 {
60 struct pci_dev *pdev = to_pci_dev(dev);
61 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
62
63 if (!edev || !edev->pe)
64 return -ENODEV;
65
66 /* Nothing to do if it's not frozen */
67 if (!(edev->pe->state & EEH_PE_ISOLATED))
68 return count;
69
70 if (eeh_unfreeze_pe(edev->pe))
71 return -EIO;
72 eeh_pe_state_clear(edev->pe, EEH_PE_ISOLATED, true);
73
74 return count;
75 }
76
77 static DEVICE_ATTR_RW(eeh_pe_state);
78
79 #if defined(CONFIG_PCI_IOV) && defined(CONFIG_PPC_PSERIES)
eeh_notify_resume_show(struct device * dev,struct device_attribute * attr,char * buf)80 static ssize_t eeh_notify_resume_show(struct device *dev,
81 struct device_attribute *attr, char *buf)
82 {
83 struct pci_dev *pdev = to_pci_dev(dev);
84 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
85 struct pci_dn *pdn = pci_get_pdn(pdev);
86
87 if (!edev || !edev->pe)
88 return -ENODEV;
89
90 return sprintf(buf, "%d\n", pdn->last_allow_rc);
91 }
92
eeh_notify_resume_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)93 static ssize_t eeh_notify_resume_store(struct device *dev,
94 struct device_attribute *attr,
95 const char *buf, size_t count)
96 {
97 struct pci_dev *pdev = to_pci_dev(dev);
98 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
99
100 if (!edev || !edev->pe || !eeh_ops->notify_resume)
101 return -ENODEV;
102
103 if (eeh_ops->notify_resume(edev))
104 return -EIO;
105
106 return count;
107 }
108 static DEVICE_ATTR_RW(eeh_notify_resume);
109
eeh_notify_resume_add(struct pci_dev * pdev)110 static int eeh_notify_resume_add(struct pci_dev *pdev)
111 {
112 struct device_node *np;
113 int rc = 0;
114
115 np = pci_device_to_OF_node(pdev->is_physfn ? pdev : pdev->physfn);
116
117 if (of_property_read_bool(np, "ibm,is-open-sriov-pf"))
118 rc = device_create_file(&pdev->dev, &dev_attr_eeh_notify_resume);
119
120 return rc;
121 }
122
eeh_notify_resume_remove(struct pci_dev * pdev)123 static void eeh_notify_resume_remove(struct pci_dev *pdev)
124 {
125 struct device_node *np;
126
127 np = pci_device_to_OF_node(pdev->is_physfn ? pdev : pdev->physfn);
128
129 if (of_property_read_bool(np, "ibm,is-open-sriov-pf"))
130 device_remove_file(&pdev->dev, &dev_attr_eeh_notify_resume);
131 }
132 #else
eeh_notify_resume_add(struct pci_dev * pdev)133 static inline int eeh_notify_resume_add(struct pci_dev *pdev) { return 0; }
eeh_notify_resume_remove(struct pci_dev * pdev)134 static inline void eeh_notify_resume_remove(struct pci_dev *pdev) { }
135 #endif /* CONFIG_PCI_IOV && CONFIG PPC_PSERIES*/
136
eeh_sysfs_add_device(struct pci_dev * pdev)137 void eeh_sysfs_add_device(struct pci_dev *pdev)
138 {
139 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
140 int rc=0;
141
142 if (!eeh_enabled())
143 return;
144
145 if (edev && (edev->mode & EEH_DEV_SYSFS))
146 return;
147
148 rc += device_create_file(&pdev->dev, &dev_attr_eeh_mode);
149 rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
150 rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_state);
151 rc += eeh_notify_resume_add(pdev);
152
153 if (rc)
154 pr_warn("EEH: Unable to create sysfs entries\n");
155 else if (edev)
156 edev->mode |= EEH_DEV_SYSFS;
157 }
158
eeh_sysfs_remove_device(struct pci_dev * pdev)159 void eeh_sysfs_remove_device(struct pci_dev *pdev)
160 {
161 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
162
163 if (!edev) {
164 WARN_ON(eeh_enabled());
165 return;
166 }
167
168 edev->mode &= ~EEH_DEV_SYSFS;
169
170 /*
171 * The parent directory might have been removed. We needn't
172 * continue for that case.
173 */
174 if (!pdev->dev.kobj.sd)
175 return;
176
177 device_remove_file(&pdev->dev, &dev_attr_eeh_mode);
178 device_remove_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
179 device_remove_file(&pdev->dev, &dev_attr_eeh_pe_state);
180
181 eeh_notify_resume_remove(pdev);
182 }
183