Initial import

1 files changed, 457 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..a52db28ec
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+++ b/arch/powerpc/include/asm/eeh.h
@@ -0,0 +1,457 @@
+/*
+ * Copyright (C) 2001  Dave Engebretsen & Todd Inglett IBM Corporation.
+ * Copyright 2001-2012 IBM Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#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>
+
+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_VALID_PE_ZERO	0x10	/* PE#0 is valid	*/
+#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 corelate
+ * 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_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	*/
+
+struct eeh_pe {
+	int type;			/* PE type: PHB/Bus/Device	*/
+	int state;			/* PE EEH dependent mode	*/
+	int config_addr;		/* Traditional PCI address	*/
+	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		*/
+	struct timeval 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;	/* Link PE to the child list	*/
+	struct list_head edevs;		/* Link list of EEH devices	*/
+	struct list_head child;		/* Child PEs			*/
+};
+
+#define eeh_pe_for_each_dev(pe, edev, tmp) \
+		list_for_each_entry_safe(edev, tmp, &pe->edevs, list)
+
+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 class_code;			/* Class code of the device	*/
+	int config_addr;		/* Config address		*/
+	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		*/
+	struct eeh_pe *pe;		/* Associated PE		*/
+	struct list_head list;		/* Form link list in the PE	*/
+	struct pci_controller *phb;	/* Associated PHB		*/
+	struct pci_dn *pdn;		/* Associated PCI device node	*/
+	struct pci_dev *pdev;		/* Associated PCI device	*/
+	struct pci_bus *bus;		/* PCI bus for partial hotplug	*/
+};
+
+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_PE_STATE_NORMAL		0	/* Normal state		*/
+#define EEH_PE_STATE_RESET		1	/* PE reset asserted	*/
+#define EEH_PE_STATE_STOPPED_IO_DMA	2	/* Frozen PE		*/
+#define EEH_PE_STATE_STOPPED_DMA	4	/* Stopped DMA, Enabled IO */
+#define EEH_PE_STATE_UNAVAIL		5	/* Unavailable		*/
+#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;
+	int (*init)(void);
+	int (*post_init)(void);
+	void* (*probe)(struct pci_dn *pdn, void *data);
+	int (*set_option)(struct eeh_pe *pe, int option);
+	int (*get_pe_addr)(struct eeh_pe *pe);
+	int (*get_state)(struct eeh_pe *pe, int *state);
+	int (*reset)(struct eeh_pe *pe, int option);
+	int (*wait_state)(struct eeh_pe *pe, int max_wait);
+	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 pci_dn *pdn, int where, int size, u32 *val);
+	int (*write_config)(struct pci_dn *pdn, int where, int size, u32 val);
+	int (*next_error)(struct eeh_pe **pe);
+	int (*restore_config)(struct pci_dn *pdn);
+};
+
+extern int eeh_subsystem_flags;
+extern int eeh_max_freezes;
+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)
+{
+	if (eeh_has_flag(EEH_FORCE_DISABLED) ||
+	    !eeh_has_flag(EEH_ENABLED))
+		return false;
+
+	return true;
+}
+
+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);
+}
+
+typedef void *(*eeh_traverse_func)(void *data, void *flag);
+void eeh_set_pe_aux_size(int size);
+int eeh_phb_pe_create(struct pci_controller *phb);
+struct eeh_pe *eeh_phb_pe_get(struct pci_controller *phb);
+struct eeh_pe *eeh_pe_get(struct eeh_dev *edev);
+int eeh_add_to_parent_pe(struct eeh_dev *edev);
+int eeh_rmv_from_parent_pe(struct eeh_dev *edev);
+void eeh_pe_update_time_stamp(struct eeh_pe *pe);
+void *eeh_pe_traverse(struct eeh_pe *root,
+		eeh_traverse_func fn, void *flag);
+void *eeh_pe_dev_traverse(struct eeh_pe *root,
+		eeh_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_dev_init(struct pci_dn *pdn, void *data);
+void eeh_dev_phb_init_dynamic(struct pci_controller *phb);
+int eeh_init(void);
+int __init eeh_ops_register(struct eeh_ops *ops);
+int __exit eeh_ops_unregister(const char *name);
+int eeh_check_failure(const volatile void __iomem *token);
+int eeh_dev_check_failure(struct eeh_dev *edev);
+void eeh_addr_cache_build(void);
+void eeh_add_device_early(struct pci_dn *);
+void eeh_add_device_tree_early(struct pci_dn *);
+void eeh_add_device_late(struct pci_dev *);
+void eeh_add_device_tree_late(struct pci_bus *);
+void eeh_add_sysfs_files(struct pci_bus *);
+void eeh_remove_device(struct pci_dev *);
+int eeh_unfreeze_pe(struct eeh_pe *pe, bool sw_state);
+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);
+int eeh_pe_configure(struct eeh_pe *pe);
+
+/**
+ * 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 int eeh_init(void)
+{
+	return 0;
+}
+
+static inline void *eeh_dev_init(struct pci_dn *pdn, void *data)
+{
+	return NULL;
+}
+
+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_build(void) { }
+
+static inline void eeh_add_device_early(struct pci_dn *pdn) { }
+
+static inline void eeh_add_device_tree_early(struct pci_dn *pdn) { }
+
+static inline void eeh_add_device_late(struct pci_dev *dev) { }
+
+static inline void eeh_add_device_tree_late(struct pci_bus *bus) { }
+
+static inline void eeh_add_sysfs_files(struct pci_bus *bus) { }
+
+static inline void eeh_remove_device(struct pci_dev *dev) { }
+
+#define EEH_POSSIBLE_ERROR(val, type) (0)
+#define EEH_IO_ERROR_VALUE(size) (-1UL)
+#endif /* CONFIG_EEH */
+
+#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);
+}
+
+#endif /* CONFIG_PPC64 */
+#endif /* __KERNEL__ */
+#endif /* _POWERPC_EEH_H */