// SPDX-License-Identifier: GPL-2.0-or-later/* * Sysfs entries for PCI Error Recovery for PAPR-compliant platform. * Copyright IBM Corporation 2007 * Copyright Linas Vepstas <linas@austin.ibm.com> 2007 * * Send comments and feedback to Linas Vepstas <linas@austin.ibm.com> */#include <linux/of.h>#include <linux/pci.h>#include <linux/stat.h>#include <linux/sysfs.h>#include <asm/ppc-pci.h>#include <asm/pci-bridge.h> /** * EEH_SHOW_ATTR -- Create sysfs entry for eeh statistic * @_name: name of file in sysfs directory * @_memb: name of member in struct eeh_dev to access * @_format: printf format for display * * All of the attributes look very similar, so just * auto-gen a cut-n-paste routine to display them. */#define EEH_SHOW_ATTR(_name,_memb,_format)               \static ssize_t eeh_show_##_name(struct device *dev,      \		struct device_attribute *attr, char *buf)          \{                                                        \	struct pci_dev *pdev = to_pci_dev(dev);               \	struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);      \	                                                      \	if (!edev)                                            \		return 0;                                     \	                                                      \	return sysfs_emit(buf, _format "\n", edev->_memb);    \}                                                        \static DEVICE_ATTR(_name, 0444, eeh_show_##_name, NULL); EEH_SHOW_ATTR(eeh_mode,            mode,            "0x%x");EEH_SHOW_ATTR(eeh_pe_config_addr,  pe_config_addr,  "0x%x"); static ssize_t eeh_pe_state_show(struct device *dev,				 struct device_attribute *attr, char *buf){	struct pci_dev *pdev = to_pci_dev(dev);	struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);	int state; 	if (!edev || !edev->pe)		return -ENODEV; 	state = eeh_ops->get_state(edev->pe, NULL);	return sysfs_emit(buf, "0x%08x 0x%08x\n", state, edev->pe->state);} static ssize_t eeh_pe_state_store(struct device *dev,				  struct device_attribute *attr,				  const char *buf, size_t count){	struct pci_dev *pdev = to_pci_dev(dev);	struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 	if (!edev || !edev->pe)		return -ENODEV; 	/* Nothing to do if it's not frozen */	if (!(edev->pe->state & EEH_PE_ISOLATED))		return count; 	if (eeh_unfreeze_pe(edev->pe))		return -EIO;	eeh_pe_state_clear(edev->pe, EEH_PE_ISOLATED, true); 	return count;} static DEVICE_ATTR_RW(eeh_pe_state); #if defined(CONFIG_PCI_IOV) && defined(CONFIG_PPC_PSERIES)static ssize_t eeh_notify_resume_show(struct device *dev,				      struct device_attribute *attr, char *buf){	struct pci_dev *pdev = to_pci_dev(dev);	struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);	struct pci_dn *pdn = pci_get_pdn(pdev); 	if (!edev || !edev->pe)		return -ENODEV; 	return sysfs_emit(buf, "%d\n", pdn->last_allow_rc);} static ssize_t eeh_notify_resume_store(struct device *dev,				       struct device_attribute *attr,				       const char *buf, size_t count){	struct pci_dev *pdev = to_pci_dev(dev);	struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 	if (!edev || !edev->pe || !eeh_ops->notify_resume)		return -ENODEV; 	if (eeh_ops->notify_resume(edev))		return -EIO; 	return count;}static DEVICE_ATTR_RW(eeh_notify_resume); static int eeh_notify_resume_add(struct pci_dev *pdev){	struct device_node *np;	int rc = 0; 	np = pci_device_to_OF_node(pdev->is_physfn ? pdev : pdev->physfn); 	if (of_property_read_bool(np, "ibm,is-open-sriov-pf"))		rc = device_create_file(&pdev->dev, &dev_attr_eeh_notify_resume); 	return rc;} static void eeh_notify_resume_remove(struct pci_dev *pdev){	struct device_node *np; 	np = pci_device_to_OF_node(pdev->is_physfn ? pdev : pdev->physfn); 	if (of_property_read_bool(np, "ibm,is-open-sriov-pf"))		device_remove_file(&pdev->dev, &dev_attr_eeh_notify_resume);}#elsestatic inline int eeh_notify_resume_add(struct pci_dev *pdev) { return 0; }static inline void eeh_notify_resume_remove(struct pci_dev *pdev) { }#endif /* CONFIG_PCI_IOV && CONFIG PPC_PSERIES*/ void eeh_sysfs_add_device(struct pci_dev *pdev){	struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);	int rc=0; 	if (!eeh_enabled())		return; 	if (edev && (edev->mode & EEH_DEV_SYSFS))		return; 	rc += device_create_file(&pdev->dev, &dev_attr_eeh_mode);	rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);	rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_state);	rc += eeh_notify_resume_add(pdev); 	if (rc)		pr_warn("EEH: Unable to create sysfs entries\n");	else if (edev)		edev->mode |= EEH_DEV_SYSFS;} void eeh_sysfs_remove_device(struct pci_dev *pdev){	struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev); 	if (!edev) {		WARN_ON(eeh_enabled());		return;	} 	edev->mode &= ~EEH_DEV_SYSFS; 	/*	 * The parent directory might have been removed. We needn't	 * continue for that case.	 */	if (!pdev->dev.kobj.sd)		return; 	device_remove_file(&pdev->dev, &dev_attr_eeh_mode);	device_remove_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);	device_remove_file(&pdev->dev, &dev_attr_eeh_pe_state); 	eeh_notify_resume_remove(pdev);}