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)               \
25static 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}                                                        \
36static DEVICE_ATTR(_name, 0444, eeh_show_##_name, NULL);
37
38EEH_SHOW_ATTR(eeh_mode,            mode,            "0x%x");
39EEH_SHOW_ATTR(eeh_pe_config_addr,  pe_config_addr,  "0x%x");
40
41static 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
56static 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
77static DEVICE_ATTR_RW(eeh_pe_state);
78
79#if defined(CONFIG_PCI_IOV) && defined(CONFIG_PPC_PSERIES)
80static 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
93static 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}
108static DEVICE_ATTR_RW(eeh_notify_resume);
109
110static 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
123static 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
133static inline int eeh_notify_resume_add(struct pci_dev *pdev) { return 0; }
134static inline void eeh_notify_resume_remove(struct pci_dev *pdev) { }
135#endif /* CONFIG_PCI_IOV && CONFIG PPC_PSERIES*/
136
137void 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
159void 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