diff options
Diffstat (limited to 'arch/powerpc/kernel/eeh_sysfs.c')
| -rw-r--r-- | arch/powerpc/kernel/eeh_sysfs.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/eeh_sysfs.c b/arch/powerpc/kernel/eeh_sysfs.c new file mode 100644 index 000000000..706e1eb95 --- /dev/null +++ b/arch/powerpc/kernel/eeh_sysfs.c @@ -0,0 +1,182 @@ +// 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 <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 sprintf(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 sprintf(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 sprintf(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); +} +#else +static 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); +} |