138 lines
4.2 KiB
C
138 lines
4.2 KiB
C
/*
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* Sysfs entries for PCI Error Recovery for PAPR-compliant platform.
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* Copyright IBM Corporation 2007
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* Copyright Linas Vepstas <linas@austin.ibm.com> 2007
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send comments and feedback to Linas Vepstas <linas@austin.ibm.com>
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*/
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#include <linux/pci.h>
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#include <linux/stat.h>
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#include <asm/ppc-pci.h>
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#include <asm/pci-bridge.h>
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/**
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* EEH_SHOW_ATTR -- Create sysfs entry for eeh statistic
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* @_name: name of file in sysfs directory
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* @_memb: name of member in struct pci_dn to access
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* @_format: printf format for display
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*
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* All of the attributes look very similar, so just
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* auto-gen a cut-n-paste routine to display them.
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*/
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#define EEH_SHOW_ATTR(_name,_memb,_format) \
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static ssize_t eeh_show_##_name(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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struct pci_dev *pdev = to_pci_dev(dev); \
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struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); \
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\
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if (!edev) \
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return 0; \
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\
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return sprintf(buf, _format "\n", edev->_memb); \
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} \
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static DEVICE_ATTR(_name, S_IRUGO, eeh_show_##_name, NULL);
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EEH_SHOW_ATTR(eeh_mode, mode, "0x%x");
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EEH_SHOW_ATTR(eeh_config_addr, config_addr, "0x%x");
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EEH_SHOW_ATTR(eeh_pe_config_addr, pe_config_addr, "0x%x");
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static ssize_t eeh_pe_state_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
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int state;
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if (!edev || !edev->pe)
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return -ENODEV;
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state = eeh_ops->get_state(edev->pe, NULL);
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return sprintf(buf, "0x%08x 0x%08x\n",
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state, edev->pe->state);
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}
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static ssize_t eeh_pe_state_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
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if (!edev || !edev->pe)
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return -ENODEV;
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/* Nothing to do if it's not frozen */
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if (!(edev->pe->state & EEH_PE_ISOLATED))
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return count;
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if (eeh_unfreeze_pe(edev->pe, true))
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return -EIO;
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return count;
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}
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static DEVICE_ATTR_RW(eeh_pe_state);
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void eeh_sysfs_add_device(struct pci_dev *pdev)
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{
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struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
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int rc=0;
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if (!eeh_enabled())
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return;
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if (edev && (edev->mode & EEH_DEV_SYSFS))
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return;
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rc += device_create_file(&pdev->dev, &dev_attr_eeh_mode);
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rc += device_create_file(&pdev->dev, &dev_attr_eeh_config_addr);
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rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
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rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_state);
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if (rc)
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pr_warn("EEH: Unable to create sysfs entries\n");
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else if (edev)
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edev->mode |= EEH_DEV_SYSFS;
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}
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void eeh_sysfs_remove_device(struct pci_dev *pdev)
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{
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struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
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/*
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* The parent directory might have been removed. We needn't
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* continue for that case.
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*/
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if (!pdev->dev.kobj.sd) {
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if (edev)
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edev->mode &= ~EEH_DEV_SYSFS;
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return;
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}
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device_remove_file(&pdev->dev, &dev_attr_eeh_mode);
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device_remove_file(&pdev->dev, &dev_attr_eeh_config_addr);
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device_remove_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
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device_remove_file(&pdev->dev, &dev_attr_eeh_pe_state);
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if (edev)
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edev->mode &= ~EEH_DEV_SYSFS;
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}
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