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Linux/arch/powerpc/kernel/eeh_sysfs.c

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  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)               \
 40 static 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 }                                                        \
 51 static DEVICE_ATTR(_name, 0444, eeh_show_##_name, NULL);
 52 
 53 EEH_SHOW_ATTR(eeh_mode,            mode,            "0x%x");
 54 EEH_SHOW_ATTR(eeh_pe_config_addr,  pe_config_addr,  "0x%x");
 55 
 56 static ssize_t eeh_pe_state_show(struct device *dev,
 57                                  struct device_attribute *attr, char *buf)
 58 {
 59         struct pci_dev *pdev = to_pci_dev(dev);
 60         struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
 61         int state;
 62 
 63         if (!edev || !edev->pe)
 64                 return -ENODEV;
 65 
 66         state = eeh_ops->get_state(edev->pe, NULL);
 67         return sprintf(buf, "0x%08x 0x%08x\n",
 68                        state, edev->pe->state);
 69 }
 70 
 71 static ssize_t eeh_pe_state_store(struct device *dev,
 72                                   struct device_attribute *attr,
 73                                   const char *buf, size_t count)
 74 {
 75         struct pci_dev *pdev = to_pci_dev(dev);
 76         struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
 77 
 78         if (!edev || !edev->pe)
 79                 return -ENODEV;
 80 
 81         /* Nothing to do if it's not frozen */
 82         if (!(edev->pe->state & EEH_PE_ISOLATED))
 83                 return count;
 84 
 85         if (eeh_unfreeze_pe(edev->pe, true))
 86                 return -EIO;
 87 
 88         return count;
 89 }
 90 
 91 static DEVICE_ATTR_RW(eeh_pe_state);
 92 
 93 #ifdef CONFIG_PCI_IOV
 94 static ssize_t eeh_notify_resume_show(struct device *dev,
 95                                       struct device_attribute *attr, char *buf)
 96 {
 97         struct pci_dev *pdev = to_pci_dev(dev);
 98         struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
 99         struct pci_dn *pdn = pci_get_pdn(pdev);
100 
101         if (!edev || !edev->pe)
102                 return -ENODEV;
103 
104         pdn = pci_get_pdn(pdev);
105         return sprintf(buf, "%d\n", pdn->last_allow_rc);
106 }
107 
108 static ssize_t eeh_notify_resume_store(struct device *dev,
109                                        struct device_attribute *attr,
110                                        const char *buf, size_t count)
111 {
112         struct pci_dev *pdev = to_pci_dev(dev);
113         struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
114 
115         if (!edev || !edev->pe || !eeh_ops->notify_resume)
116                 return -ENODEV;
117 
118         if (eeh_ops->notify_resume(pci_get_pdn(pdev)))
119                 return -EIO;
120 
121         return count;
122 }
123 static DEVICE_ATTR_RW(eeh_notify_resume);
124 
125 static int eeh_notify_resume_add(struct pci_dev *pdev)
126 {
127         struct device_node *np;
128         int rc = 0;
129 
130         np = pci_device_to_OF_node(pdev->is_physfn ? pdev : pdev->physfn);
131 
132         if (of_property_read_bool(np, "ibm,is-open-sriov-pf"))
133                 rc = device_create_file(&pdev->dev, &dev_attr_eeh_notify_resume);
134 
135         return rc;
136 }
137 
138 static void eeh_notify_resume_remove(struct pci_dev *pdev)
139 {
140         struct device_node *np;
141 
142         np = pci_device_to_OF_node(pdev->is_physfn ? pdev : pdev->physfn);
143 
144         if (of_property_read_bool(np, "ibm,is-open-sriov-pf"))
145                 device_remove_file(&pdev->dev, &dev_attr_eeh_notify_resume);
146 }
147 #else
148 static inline int eeh_notify_resume_add(struct pci_dev *pdev) { return 0; }
149 static inline void eeh_notify_resume_remove(struct pci_dev *pdev) { }
150 #endif /* CONFIG_PCI_IOV */
151 
152 void eeh_sysfs_add_device(struct pci_dev *pdev)
153 {
154         struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
155         int rc=0;
156 
157         if (!eeh_enabled())
158                 return;
159 
160         if (edev && (edev->mode & EEH_DEV_SYSFS))
161                 return;
162 
163         rc += device_create_file(&pdev->dev, &dev_attr_eeh_mode);
164         rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
165         rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_state);
166         rc += eeh_notify_resume_add(pdev);
167 
168         if (rc)
169                 pr_warn("EEH: Unable to create sysfs entries\n");
170         else if (edev)
171                 edev->mode |= EEH_DEV_SYSFS;
172 }
173 
174 void eeh_sysfs_remove_device(struct pci_dev *pdev)
175 {
176         struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
177 
178         /*
179          * The parent directory might have been removed. We needn't
180          * continue for that case.
181          */
182         if (!pdev->dev.kobj.sd) {
183                 if (edev)
184                         edev->mode &= ~EEH_DEV_SYSFS;
185                 return;
186         }
187 
188         device_remove_file(&pdev->dev, &dev_attr_eeh_mode);
189         device_remove_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
190         device_remove_file(&pdev->dev, &dev_attr_eeh_pe_state);
191 
192         eeh_notify_resume_remove(pdev);
193 
194         if (edev)
195                 edev->mode &= ~EEH_DEV_SYSFS;
196 }
197 

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