1/*
2 * Sysfs entries for PCI Error Recovery for PAPR-compliant platform.
3 * Copyright IBM Corporation 2007
4 * Copyright Linas Vepstas <linas@austin.ibm.com> 2007
5 *
6 * All rights reserved.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or (at
11 * your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
16 * NON INFRINGEMENT.  See the GNU General Public License for more
17 * details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 *
23 * Send comments and feedback to Linas Vepstas <linas@austin.ibm.com>
24 */
25#include <linux/pci.h>
26#include <linux/stat.h>
27#include <asm/ppc-pci.h>
28#include <asm/pci-bridge.h>
29
30/**
31 * EEH_SHOW_ATTR -- Create sysfs entry for eeh statistic
32 * @_name: name of file in sysfs directory
33 * @_memb: name of member in struct pci_dn to access
34 * @_format: printf format for display
35 *
36 * All of the attributes look very similar, so just
37 * auto-gen a cut-n-paste routine to display them.
38 */
39#define EEH_SHOW_ATTR(_name,_memb,_format)               \
40static ssize_t eeh_show_##_name(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	                                                      \
46	if (!edev)                                            \
47		return 0;                                     \
48	                                                      \
49	return sprintf(buf, _format "\n", edev->_memb);       \
50}                                                        \
51static DEVICE_ATTR(_name, S_IRUGO, eeh_show_##_name, NULL);
52
53EEH_SHOW_ATTR(eeh_mode,            mode,            "0x%x");
54EEH_SHOW_ATTR(eeh_config_addr,     config_addr,     "0x%x");
55EEH_SHOW_ATTR(eeh_pe_config_addr,  pe_config_addr,  "0x%x");
56
57static ssize_t eeh_pe_state_show(struct device *dev,
58				 struct device_attribute *attr, char *buf)
59{
60	struct pci_dev *pdev = to_pci_dev(dev);
61	struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
62	int state;
63
64	if (!edev || !edev->pe)
65		return -ENODEV;
66
67	state = eeh_ops->get_state(edev->pe, NULL);
68	return sprintf(buf, "0x%08x 0x%08x\n",
69		       state, edev->pe->state);
70}
71
72static ssize_t eeh_pe_state_store(struct device *dev,
73				  struct device_attribute *attr,
74				  const char *buf, size_t count)
75{
76	struct pci_dev *pdev = to_pci_dev(dev);
77	struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
78
79	if (!edev || !edev->pe)
80		return -ENODEV;
81
82	/* Nothing to do if it's not frozen */
83	if (!(edev->pe->state & EEH_PE_ISOLATED))
84		return count;
85
86	if (eeh_unfreeze_pe(edev->pe, true))
87		return -EIO;
88
89	return count;
90}
91
92static DEVICE_ATTR_RW(eeh_pe_state);
93
94void eeh_sysfs_add_device(struct pci_dev *pdev)
95{
96	struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
97	int rc=0;
98
99	if (!eeh_enabled())
100		return;
101
102	if (edev && (edev->mode & EEH_DEV_SYSFS))
103		return;
104
105	rc += device_create_file(&pdev->dev, &dev_attr_eeh_mode);
106	rc += device_create_file(&pdev->dev, &dev_attr_eeh_config_addr);
107	rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
108	rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_state);
109
110	if (rc)
111		pr_warn("EEH: Unable to create sysfs entries\n");
112	else if (edev)
113		edev->mode |= EEH_DEV_SYSFS;
114}
115
116void eeh_sysfs_remove_device(struct pci_dev *pdev)
117{
118	struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
119
120	/*
121	 * The parent directory might have been removed. We needn't
122	 * continue for that case.
123	 */
124	if (!pdev->dev.kobj.sd) {
125		if (edev)
126			edev->mode &= ~EEH_DEV_SYSFS;
127		return;
128	}
129
130	device_remove_file(&pdev->dev, &dev_attr_eeh_mode);
131	device_remove_file(&pdev->dev, &dev_attr_eeh_config_addr);
132	device_remove_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
133	device_remove_file(&pdev->dev, &dev_attr_eeh_pe_state);
134
135	if (edev)
136		edev->mode &= ~EEH_DEV_SYSFS;
137}
138