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Diffstat (limited to 'arch/powerpc/include/asm/eeh.h')
| -rw-r--r-- | arch/powerpc/include/asm/eeh.h | 467 |
1 files changed, 467 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h new file mode 100644 index 000000000..b1a5bba2e --- /dev/null +++ b/arch/powerpc/include/asm/eeh.h @@ -0,0 +1,467 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2001 Dave Engebretsen & Todd Inglett IBM Corporation. + * Copyright 2001-2012 IBM Corporation. + */ + +#ifndef _POWERPC_EEH_H +#define _POWERPC_EEH_H +#ifdef __KERNEL__ + +#include <linux/init.h> +#include <linux/list.h> +#include <linux/string.h> +#include <linux/time.h> +#include <linux/atomic.h> + +#include <uapi/asm/eeh.h> + +struct pci_dev; +struct pci_bus; +struct pci_dn; + +#ifdef CONFIG_EEH + +/* EEH subsystem flags */ +#define EEH_ENABLED 0x01 /* EEH enabled */ +#define EEH_FORCE_DISABLED 0x02 /* EEH disabled */ +#define EEH_PROBE_MODE_DEV 0x04 /* From PCI device */ +#define EEH_PROBE_MODE_DEVTREE 0x08 /* From device tree */ +#define EEH_ENABLE_IO_FOR_LOG 0x20 /* Enable IO for log */ +#define EEH_EARLY_DUMP_LOG 0x40 /* Dump log immediately */ + +/* + * Delay for PE reset, all in ms + * + * PCI specification has reset hold time of 100 milliseconds. + * We have 250 milliseconds here. The PCI bus settlement time + * is specified as 1.5 seconds and we have 1.8 seconds. + */ +#define EEH_PE_RST_HOLD_TIME 250 +#define EEH_PE_RST_SETTLE_TIME 1800 + +/* + * The struct is used to trace PE related EEH functionality. + * In theory, there will have one instance of the struct to + * be created against particular PE. In nature, PEs correlate + * to each other. the struct has to reflect that hierarchy in + * order to easily pick up those affected PEs when one particular + * PE has EEH errors. + * + * Also, one particular PE might be composed of PCI device, PCI + * bus and its subordinate components. The struct also need ship + * the information. Further more, one particular PE is only meaingful + * in the corresponding PHB. Therefore, the root PEs should be created + * against existing PHBs in on-to-one fashion. + */ +#define EEH_PE_INVALID (1 << 0) /* Invalid */ +#define EEH_PE_PHB (1 << 1) /* PHB PE */ +#define EEH_PE_DEVICE (1 << 2) /* Device PE */ +#define EEH_PE_BUS (1 << 3) /* Bus PE */ +#define EEH_PE_VF (1 << 4) /* VF PE */ + +#define EEH_PE_ISOLATED (1 << 0) /* Isolated PE */ +#define EEH_PE_RECOVERING (1 << 1) /* Recovering PE */ +#define EEH_PE_CFG_BLOCKED (1 << 2) /* Block config access */ +#define EEH_PE_RESET (1 << 3) /* PE reset in progress */ + +#define EEH_PE_KEEP (1 << 8) /* Keep PE on hotplug */ +#define EEH_PE_CFG_RESTRICTED (1 << 9) /* Block config on error */ +#define EEH_PE_REMOVED (1 << 10) /* Removed permanently */ +#define EEH_PE_PRI_BUS (1 << 11) /* Cached primary bus */ + +struct eeh_pe { + int type; /* PE type: PHB/Bus/Device */ + int state; /* PE EEH dependent mode */ + int addr; /* PE configuration address */ + struct pci_controller *phb; /* Associated PHB */ + struct pci_bus *bus; /* Top PCI bus for bus PE */ + int check_count; /* Times of ignored error */ + int freeze_count; /* Times of froze up */ + time64_t tstamp; /* Time on first-time freeze */ + int false_positives; /* Times of reported #ff's */ + atomic_t pass_dev_cnt; /* Count of passed through devs */ + struct eeh_pe *parent; /* Parent PE */ + void *data; /* PE auxillary data */ + struct list_head child_list; /* List of PEs below this PE */ + struct list_head child; /* Memb. child_list/eeh_phb_pe */ + struct list_head edevs; /* List of eeh_dev in this PE */ + +#ifdef CONFIG_STACKTRACE + /* + * Saved stack trace. When we find a PE freeze in eeh_dev_check_failure + * the stack trace is saved here so we can print it in the recovery + * thread if it turns out to due to a real problem rather than + * a hot-remove. + * + * A max of 64 entries might be overkill, but it also might not be. + */ + unsigned long stack_trace[64]; + int trace_entries; +#endif /* CONFIG_STACKTRACE */ +}; + +#define eeh_pe_for_each_dev(pe, edev, tmp) \ + list_for_each_entry_safe(edev, tmp, &pe->edevs, entry) + +#define eeh_for_each_pe(root, pe) \ + for (pe = root; pe; pe = eeh_pe_next(pe, root)) + +static inline bool eeh_pe_passed(struct eeh_pe *pe) +{ + return pe ? !!atomic_read(&pe->pass_dev_cnt) : false; +} + +/* + * The struct is used to trace EEH state for the associated + * PCI device node or PCI device. In future, it might + * represent PE as well so that the EEH device to form + * another tree except the currently existing tree of PCI + * buses and PCI devices + */ +#define EEH_DEV_BRIDGE (1 << 0) /* PCI bridge */ +#define EEH_DEV_ROOT_PORT (1 << 1) /* PCIe root port */ +#define EEH_DEV_DS_PORT (1 << 2) /* Downstream port */ +#define EEH_DEV_IRQ_DISABLED (1 << 3) /* Interrupt disabled */ +#define EEH_DEV_DISCONNECTED (1 << 4) /* Removing from PE */ + +#define EEH_DEV_NO_HANDLER (1 << 8) /* No error handler */ +#define EEH_DEV_SYSFS (1 << 9) /* Sysfs created */ +#define EEH_DEV_REMOVED (1 << 10) /* Removed permanently */ + +struct eeh_dev { + int mode; /* EEH mode */ + int bdfn; /* bdfn of device (for cfg ops) */ + struct pci_controller *controller; + int pe_config_addr; /* PE config address */ + u32 config_space[16]; /* Saved PCI config space */ + int pcix_cap; /* Saved PCIx capability */ + int pcie_cap; /* Saved PCIe capability */ + int aer_cap; /* Saved AER capability */ + int af_cap; /* Saved AF capability */ + struct eeh_pe *pe; /* Associated PE */ + struct list_head entry; /* Membership in eeh_pe.edevs */ + struct list_head rmv_entry; /* Membership in rmv_list */ + struct pci_dn *pdn; /* Associated PCI device node */ + struct pci_dev *pdev; /* Associated PCI device */ + bool in_error; /* Error flag for edev */ + + /* VF specific properties */ + struct pci_dev *physfn; /* Associated SRIOV PF */ + int vf_index; /* Index of this VF */ +}; + +/* "fmt" must be a simple literal string */ +#define EEH_EDEV_PRINT(level, edev, fmt, ...) \ + pr_##level("PCI %04x:%02x:%02x.%x#%04x: EEH: " fmt, \ + (edev)->controller->global_number, PCI_BUSNO((edev)->bdfn), \ + PCI_SLOT((edev)->bdfn), PCI_FUNC((edev)->bdfn), \ + ((edev)->pe ? (edev)->pe_config_addr : 0xffff), ##__VA_ARGS__) +#define eeh_edev_dbg(edev, fmt, ...) EEH_EDEV_PRINT(debug, (edev), fmt, ##__VA_ARGS__) +#define eeh_edev_info(edev, fmt, ...) EEH_EDEV_PRINT(info, (edev), fmt, ##__VA_ARGS__) +#define eeh_edev_warn(edev, fmt, ...) EEH_EDEV_PRINT(warn, (edev), fmt, ##__VA_ARGS__) +#define eeh_edev_err(edev, fmt, ...) EEH_EDEV_PRINT(err, (edev), fmt, ##__VA_ARGS__) + +static inline struct pci_dn *eeh_dev_to_pdn(struct eeh_dev *edev) +{ + return edev ? edev->pdn : NULL; +} + +static inline struct pci_dev *eeh_dev_to_pci_dev(struct eeh_dev *edev) +{ + return edev ? edev->pdev : NULL; +} + +static inline struct eeh_pe *eeh_dev_to_pe(struct eeh_dev* edev) +{ + return edev ? edev->pe : NULL; +} + +/* Return values from eeh_ops::next_error */ +enum { + EEH_NEXT_ERR_NONE = 0, + EEH_NEXT_ERR_INF, + EEH_NEXT_ERR_FROZEN_PE, + EEH_NEXT_ERR_FENCED_PHB, + EEH_NEXT_ERR_DEAD_PHB, + EEH_NEXT_ERR_DEAD_IOC +}; + +/* + * The struct is used to trace the registered EEH operation + * callback functions. Actually, those operation callback + * functions are heavily platform dependent. That means the + * platform should register its own EEH operation callback + * functions before any EEH further operations. + */ +#define EEH_OPT_DISABLE 0 /* EEH disable */ +#define EEH_OPT_ENABLE 1 /* EEH enable */ +#define EEH_OPT_THAW_MMIO 2 /* MMIO enable */ +#define EEH_OPT_THAW_DMA 3 /* DMA enable */ +#define EEH_OPT_FREEZE_PE 4 /* Freeze PE */ +#define EEH_STATE_UNAVAILABLE (1 << 0) /* State unavailable */ +#define EEH_STATE_NOT_SUPPORT (1 << 1) /* EEH not supported */ +#define EEH_STATE_RESET_ACTIVE (1 << 2) /* Active reset */ +#define EEH_STATE_MMIO_ACTIVE (1 << 3) /* Active MMIO */ +#define EEH_STATE_DMA_ACTIVE (1 << 4) /* Active DMA */ +#define EEH_STATE_MMIO_ENABLED (1 << 5) /* MMIO enabled */ +#define EEH_STATE_DMA_ENABLED (1 << 6) /* DMA enabled */ +#define EEH_RESET_DEACTIVATE 0 /* Deactivate the PE reset */ +#define EEH_RESET_HOT 1 /* Hot reset */ +#define EEH_RESET_FUNDAMENTAL 3 /* Fundamental reset */ +#define EEH_LOG_TEMP 1 /* EEH temporary error log */ +#define EEH_LOG_PERM 2 /* EEH permanent error log */ + +struct eeh_ops { + char *name; + struct eeh_dev *(*probe)(struct pci_dev *pdev); + int (*set_option)(struct eeh_pe *pe, int option); + int (*get_state)(struct eeh_pe *pe, int *delay); + int (*reset)(struct eeh_pe *pe, int option); + int (*get_log)(struct eeh_pe *pe, int severity, char *drv_log, unsigned long len); + int (*configure_bridge)(struct eeh_pe *pe); + int (*err_inject)(struct eeh_pe *pe, int type, int func, + unsigned long addr, unsigned long mask); + int (*read_config)(struct eeh_dev *edev, int where, int size, u32 *val); + int (*write_config)(struct eeh_dev *edev, int where, int size, u32 val); + int (*next_error)(struct eeh_pe **pe); + int (*restore_config)(struct eeh_dev *edev); + int (*notify_resume)(struct eeh_dev *edev); +}; + +extern int eeh_subsystem_flags; +extern u32 eeh_max_freezes; +extern bool eeh_debugfs_no_recover; +extern struct eeh_ops *eeh_ops; +extern raw_spinlock_t confirm_error_lock; + +static inline void eeh_add_flag(int flag) +{ + eeh_subsystem_flags |= flag; +} + +static inline void eeh_clear_flag(int flag) +{ + eeh_subsystem_flags &= ~flag; +} + +static inline bool eeh_has_flag(int flag) +{ + return !!(eeh_subsystem_flags & flag); +} + +static inline bool eeh_enabled(void) +{ + return eeh_has_flag(EEH_ENABLED) && !eeh_has_flag(EEH_FORCE_DISABLED); +} + +static inline void eeh_serialize_lock(unsigned long *flags) +{ + raw_spin_lock_irqsave(&confirm_error_lock, *flags); +} + +static inline void eeh_serialize_unlock(unsigned long flags) +{ + raw_spin_unlock_irqrestore(&confirm_error_lock, flags); +} + +static inline bool eeh_state_active(int state) +{ + return (state & (EEH_STATE_MMIO_ACTIVE | EEH_STATE_DMA_ACTIVE)) + == (EEH_STATE_MMIO_ACTIVE | EEH_STATE_DMA_ACTIVE); +} + +typedef void (*eeh_edev_traverse_func)(struct eeh_dev *edev, void *flag); +typedef void *(*eeh_pe_traverse_func)(struct eeh_pe *pe, void *flag); +void eeh_set_pe_aux_size(int size); +int eeh_phb_pe_create(struct pci_controller *phb); +int eeh_wait_state(struct eeh_pe *pe, int max_wait); +struct eeh_pe *eeh_phb_pe_get(struct pci_controller *phb); +struct eeh_pe *eeh_pe_next(struct eeh_pe *pe, struct eeh_pe *root); +struct eeh_pe *eeh_pe_get(struct pci_controller *phb, int pe_no); +int eeh_pe_tree_insert(struct eeh_dev *edev, struct eeh_pe *new_pe_parent); +int eeh_pe_tree_remove(struct eeh_dev *edev); +void eeh_pe_update_time_stamp(struct eeh_pe *pe); +void *eeh_pe_traverse(struct eeh_pe *root, + eeh_pe_traverse_func fn, void *flag); +void eeh_pe_dev_traverse(struct eeh_pe *root, + eeh_edev_traverse_func fn, void *flag); +void eeh_pe_restore_bars(struct eeh_pe *pe); +const char *eeh_pe_loc_get(struct eeh_pe *pe); +struct pci_bus *eeh_pe_bus_get(struct eeh_pe *pe); + +void eeh_show_enabled(void); +int __init eeh_init(struct eeh_ops *ops); +int eeh_check_failure(const volatile void __iomem *token); +int eeh_dev_check_failure(struct eeh_dev *edev); +void eeh_addr_cache_init(void); +void eeh_probe_device(struct pci_dev *pdev); +void eeh_remove_device(struct pci_dev *); +int eeh_unfreeze_pe(struct eeh_pe *pe); +int eeh_pe_reset_and_recover(struct eeh_pe *pe); +int eeh_dev_open(struct pci_dev *pdev); +void eeh_dev_release(struct pci_dev *pdev); +struct eeh_pe *eeh_iommu_group_to_pe(struct iommu_group *group); +int eeh_pe_set_option(struct eeh_pe *pe, int option); +int eeh_pe_get_state(struct eeh_pe *pe); +int eeh_pe_reset(struct eeh_pe *pe, int option, bool include_passed); +int eeh_pe_configure(struct eeh_pe *pe); +int eeh_pe_inject_err(struct eeh_pe *pe, int type, int func, + unsigned long addr, unsigned long mask); + +/** + * EEH_POSSIBLE_ERROR() -- test for possible MMIO failure. + * + * If this macro yields TRUE, the caller relays to eeh_check_failure() + * which does further tests out of line. + */ +#define EEH_POSSIBLE_ERROR(val, type) ((val) == (type)~0 && eeh_enabled()) + +/* + * Reads from a device which has been isolated by EEH will return + * all 1s. This macro gives an all-1s value of the given size (in + * bytes: 1, 2, or 4) for comparing with the result of a read. + */ +#define EEH_IO_ERROR_VALUE(size) (~0U >> ((4 - (size)) * 8)) + +#else /* !CONFIG_EEH */ + +static inline bool eeh_enabled(void) +{ + return false; +} + +static inline void eeh_show_enabled(void) { } + +static inline void eeh_dev_phb_init_dynamic(struct pci_controller *phb) { } + +static inline int eeh_check_failure(const volatile void __iomem *token) +{ + return 0; +} + +#define eeh_dev_check_failure(x) (0) + +static inline void eeh_addr_cache_init(void) { } + +static inline void eeh_probe_device(struct pci_dev *dev) { } + +static inline void eeh_remove_device(struct pci_dev *dev) { } + +#define EEH_POSSIBLE_ERROR(val, type) (0) +#define EEH_IO_ERROR_VALUE(size) (-1UL) +static inline int eeh_phb_pe_create(struct pci_controller *phb) { return 0; } +#endif /* CONFIG_EEH */ + +#if defined(CONFIG_PPC_PSERIES) && defined(CONFIG_EEH) +void pseries_eeh_init_edev(struct pci_dn *pdn); +void pseries_eeh_init_edev_recursive(struct pci_dn *pdn); +#else +static inline void pseries_eeh_add_device_early(struct pci_dn *pdn) { } +static inline void pseries_eeh_add_device_tree_early(struct pci_dn *pdn) { } +#endif + +#ifdef CONFIG_PPC64 +/* + * MMIO read/write operations with EEH support. + */ +static inline u8 eeh_readb(const volatile void __iomem *addr) +{ + u8 val = in_8(addr); + if (EEH_POSSIBLE_ERROR(val, u8)) + eeh_check_failure(addr); + return val; +} + +static inline u16 eeh_readw(const volatile void __iomem *addr) +{ + u16 val = in_le16(addr); + if (EEH_POSSIBLE_ERROR(val, u16)) + eeh_check_failure(addr); + return val; +} + +static inline u32 eeh_readl(const volatile void __iomem *addr) +{ + u32 val = in_le32(addr); + if (EEH_POSSIBLE_ERROR(val, u32)) + eeh_check_failure(addr); + return val; +} + +static inline u64 eeh_readq(const volatile void __iomem *addr) +{ + u64 val = in_le64(addr); + if (EEH_POSSIBLE_ERROR(val, u64)) + eeh_check_failure(addr); + return val; +} + +static inline u16 eeh_readw_be(const volatile void __iomem *addr) +{ + u16 val = in_be16(addr); + if (EEH_POSSIBLE_ERROR(val, u16)) + eeh_check_failure(addr); + return val; +} + +static inline u32 eeh_readl_be(const volatile void __iomem *addr) +{ + u32 val = in_be32(addr); + if (EEH_POSSIBLE_ERROR(val, u32)) + eeh_check_failure(addr); + return val; +} + +static inline u64 eeh_readq_be(const volatile void __iomem *addr) +{ + u64 val = in_be64(addr); + if (EEH_POSSIBLE_ERROR(val, u64)) + eeh_check_failure(addr); + return val; +} + +static inline void eeh_memcpy_fromio(void *dest, const + volatile void __iomem *src, + unsigned long n) +{ + _memcpy_fromio(dest, src, n); + + /* Look for ffff's here at dest[n]. Assume that at least 4 bytes + * were copied. Check all four bytes. + */ + if (n >= 4 && EEH_POSSIBLE_ERROR(*((u32 *)(dest + n - 4)), u32)) + eeh_check_failure(src); +} + +/* in-string eeh macros */ +static inline void eeh_readsb(const volatile void __iomem *addr, void * buf, + int ns) +{ + _insb(addr, buf, ns); + if (EEH_POSSIBLE_ERROR((*(((u8*)buf)+ns-1)), u8)) + eeh_check_failure(addr); +} + +static inline void eeh_readsw(const volatile void __iomem *addr, void * buf, + int ns) +{ + _insw(addr, buf, ns); + if (EEH_POSSIBLE_ERROR((*(((u16*)buf)+ns-1)), u16)) + eeh_check_failure(addr); +} + +static inline void eeh_readsl(const volatile void __iomem *addr, void * buf, + int nl) +{ + _insl(addr, buf, nl); + if (EEH_POSSIBLE_ERROR((*(((u32*)buf)+nl-1)), u32)) + eeh_check_failure(addr); +} + + +void eeh_cache_debugfs_init(void); + +#endif /* CONFIG_PPC64 */ +#endif /* __KERNEL__ */ +#endif /* _POWERPC_EEH_H */ |