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