treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / arch / powerpc / kernel / eeh_sysfs.c
blobab44d965a53c7a5ffe91f0909d7d5b40cfbae8a7
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
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>
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 pci_dn to access
18 * @_format: printf format for display
20 * All of the attributes look very similar, so just
21 * auto-gen a cut-n-paste routine to display them.
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); \
30 if (!edev) \
31 return 0; \
33 return sprintf(buf, _format "\n", edev->_memb); \
34 } \
35 static DEVICE_ATTR(_name, 0444, eeh_show_##_name, NULL);
37 EEH_SHOW_ATTR(eeh_mode, mode, "0x%x");
38 EEH_SHOW_ATTR(eeh_pe_config_addr, pe_config_addr, "0x%x");
40 static ssize_t eeh_pe_state_show(struct device *dev,
41 struct device_attribute *attr, char *buf)
43 struct pci_dev *pdev = to_pci_dev(dev);
44 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
45 int state;
47 if (!edev || !edev->pe)
48 return -ENODEV;
50 state = eeh_ops->get_state(edev->pe, NULL);
51 return sprintf(buf, "0x%08x 0x%08x\n",
52 state, edev->pe->state);
55 static ssize_t eeh_pe_state_store(struct device *dev,
56 struct device_attribute *attr,
57 const char *buf, size_t count)
59 struct pci_dev *pdev = to_pci_dev(dev);
60 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
62 if (!edev || !edev->pe)
63 return -ENODEV;
65 /* Nothing to do if it's not frozen */
66 if (!(edev->pe->state & EEH_PE_ISOLATED))
67 return count;
69 if (eeh_unfreeze_pe(edev->pe))
70 return -EIO;
71 eeh_pe_state_clear(edev->pe, EEH_PE_ISOLATED, true);
73 return count;
76 static DEVICE_ATTR_RW(eeh_pe_state);
78 #ifdef CONFIG_PCI_IOV
79 static ssize_t eeh_notify_resume_show(struct device *dev,
80 struct device_attribute *attr, char *buf)
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);
86 if (!edev || !edev->pe)
87 return -ENODEV;
89 pdn = pci_get_pdn(pdev);
90 return sprintf(buf, "%d\n", pdn->last_allow_rc);
93 static ssize_t eeh_notify_resume_store(struct device *dev,
94 struct device_attribute *attr,
95 const char *buf, size_t count)
97 struct pci_dev *pdev = to_pci_dev(dev);
98 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
100 if (!edev || !edev->pe || !eeh_ops->notify_resume)
101 return -ENODEV;
103 if (eeh_ops->notify_resume(pci_get_pdn(pdev)))
104 return -EIO;
106 return count;
108 static DEVICE_ATTR_RW(eeh_notify_resume);
110 static int eeh_notify_resume_add(struct pci_dev *pdev)
112 struct device_node *np;
113 int rc = 0;
115 np = pci_device_to_OF_node(pdev->is_physfn ? pdev : pdev->physfn);
117 if (of_property_read_bool(np, "ibm,is-open-sriov-pf"))
118 rc = device_create_file(&pdev->dev, &dev_attr_eeh_notify_resume);
120 return rc;
123 static void eeh_notify_resume_remove(struct pci_dev *pdev)
125 struct device_node *np;
127 np = pci_device_to_OF_node(pdev->is_physfn ? pdev : pdev->physfn);
129 if (of_property_read_bool(np, "ibm,is-open-sriov-pf"))
130 device_remove_file(&pdev->dev, &dev_attr_eeh_notify_resume);
132 #else
133 static inline int eeh_notify_resume_add(struct pci_dev *pdev) { return 0; }
134 static inline void eeh_notify_resume_remove(struct pci_dev *pdev) { }
135 #endif /* CONFIG_PCI_IOV */
137 void eeh_sysfs_add_device(struct pci_dev *pdev)
139 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
140 int rc=0;
142 if (!eeh_enabled())
143 return;
145 if (edev && (edev->mode & EEH_DEV_SYSFS))
146 return;
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);
153 if (rc)
154 pr_warn("EEH: Unable to create sysfs entries\n");
155 else if (edev)
156 edev->mode |= EEH_DEV_SYSFS;
159 void eeh_sysfs_remove_device(struct pci_dev *pdev)
161 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
164 * The parent directory might have been removed. We needn't
165 * continue for that case.
167 if (!pdev->dev.kobj.sd) {
168 if (edev)
169 edev->mode &= ~EEH_DEV_SYSFS;
170 return;
173 device_remove_file(&pdev->dev, &dev_attr_eeh_mode);
174 device_remove_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
175 device_remove_file(&pdev->dev, &dev_attr_eeh_pe_state);
177 eeh_notify_resume_remove(pdev);
179 if (edev)
180 edev->mode &= ~EEH_DEV_SYSFS;