1 // SPDX-License-Identifier: GPL-2.0-or-later
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>
10 #include <linux/pci.h>
11 #include <linux/stat.h>
12 #include <asm/ppc-pci.h>
13 #include <asm/pci-bridge.h>
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
21 * All of the attributes look very similar, so just
22 * auto-gen a cut-n-paste routine to display them.
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) \
28 struct pci_dev *pdev = to_pci_dev(dev); \
29 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); \
34 return sprintf(buf, _format "\n", edev->_memb); \
36 static DEVICE_ATTR(_name, 0444, eeh_show_##_name, NULL);
38 EEH_SHOW_ATTR(eeh_mode, mode, "0x%x");
39 EEH_SHOW_ATTR(eeh_pe_config_addr, pe_config_addr, "0x%x");
41 static ssize_t eeh_pe_state_show(struct device *dev,
42 struct device_attribute *attr, char *buf)
44 struct pci_dev *pdev = to_pci_dev(dev);
45 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
48 if (!edev || !edev->pe)
51 state = eeh_ops->get_state(edev->pe, NULL);
52 return sprintf(buf, "0x%08x 0x%08x\n",
53 state, edev->pe->state);
56 static ssize_t eeh_pe_state_store(struct device *dev,
57 struct device_attribute *attr,
58 const char *buf, size_t count)
60 struct pci_dev *pdev = to_pci_dev(dev);
61 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
63 if (!edev || !edev->pe)
66 /* Nothing to do if it's not frozen */
67 if (!(edev->pe->state & EEH_PE_ISOLATED))
70 if (eeh_unfreeze_pe(edev->pe))
72 eeh_pe_state_clear(edev->pe, EEH_PE_ISOLATED, true);
77 static DEVICE_ATTR_RW(eeh_pe_state);
79 #if defined(CONFIG_PCI_IOV) && defined(CONFIG_PPC_PSERIES)
80 static ssize_t eeh_notify_resume_show(struct device *dev,
81 struct device_attribute *attr, char *buf)
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);
87 if (!edev || !edev->pe)
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)
103 if (eeh_ops->notify_resume(edev))
108 static DEVICE_ATTR_RW(eeh_notify_resume);
110 static int eeh_notify_resume_add(struct pci_dev *pdev)
112 struct device_node *np;
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);
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);
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 && CONFIG PPC_PSERIES*/
137 void eeh_sysfs_add_device(struct pci_dev *pdev)
139 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
145 if (edev && (edev->mode & EEH_DEV_SYSFS))
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);
154 pr_warn("EEH: Unable to create sysfs entries\n");
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 WARN_ON(eeh_enabled());
168 edev->mode &= ~EEH_DEV_SYSFS;
171 * The parent directory might have been removed. We needn't
172 * continue for that case.
174 if (!pdev->dev.kobj.sd)
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);
181 eeh_notify_resume_remove(pdev);