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/stat.h>
11 #include <asm/ppc-pci.h>
12 #include <asm/pci-bridge.h>
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) \
27 struct pci_dev *pdev = to_pci_dev(dev); \
28 struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); \
33 return sprintf(buf, _format "\n", edev->_memb); \
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
);
47 if (!edev
|| !edev
->pe
)
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
)
65 /* Nothing to do if it's not frozen */
66 if (!(edev
->pe
->state
& EEH_PE_ISOLATED
))
69 if (eeh_unfreeze_pe(edev
->pe
))
71 eeh_pe_state_clear(edev
->pe
, EEH_PE_ISOLATED
, true);
76 static DEVICE_ATTR_RW(eeh_pe_state
);
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
)
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
)
103 if (eeh_ops
->notify_resume(pci_get_pdn(pdev
)))
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 */
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 * The parent directory might have been removed. We needn't
165 * continue for that case.
167 if (!pdev
->dev
.kobj
.sd
) {
169 edev
->mode
&= ~EEH_DEV_SYSFS
;
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
);
180 edev
->mode
&= ~EEH_DEV_SYSFS
;