powerpc/eeh: Cleanup comments in the EEH core
The EEH has been implemented on pSeries platform. The original
code looks a little bit nasty. The patch does cleanup on the
current EEH implementation so that it looks more clean.
* Duplicated comments have been removed from the corresponding
header files.
* Comments have been reorganized so that it looks more clean.
* The leading comments of functions are adjusted for a little
bit so that the result of "make pdfdocs" would be more
unified.
* Function definitions and calls have unified format as "xxx()".
That means the format "xxx ()" has been replaced by "xxx()".
* There're multiple functions implemented for resetting PE. The
position of those functions have been move around so that they
are adjacent to each other to reflect their relationship.
Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Gavin Shan
Benjamin Herrenschmidt
Родитель
b078766026
Коммит
cb3bc9d0de
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@ -1,6 +1,6 @@
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/*
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* eeh.h
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* Copyright (C) 2001 Dave Engebretsen & Todd Inglett IBM Corporation.
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* Copyright 2001-2012 IBM Corporation.
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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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@ -40,8 +40,10 @@ extern int eeh_subsystem_enabled;
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#define EEH_MODE_RECOVERING (1<<3)
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#define EEH_MODE_IRQ_DISABLED (1<<4)
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/* Max number of EEH freezes allowed before we consider the device
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* to be permanently disabled. */
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/*
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* Max number of EEH freezes allowed before we consider the device
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* to be permanently disabled.
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*/
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#define EEH_MAX_ALLOWED_FREEZES 5
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void __init eeh_init(void);
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@ -49,26 +51,8 @@ unsigned long eeh_check_failure(const volatile void __iomem *token,
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unsigned long val);
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int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev);
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void __init pci_addr_cache_build(void);
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/**
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* eeh_add_device_early
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* eeh_add_device_late
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*
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* Perform eeh initialization for devices added after boot.
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* Call eeh_add_device_early before doing any i/o to the
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* device (including config space i/o). Call eeh_add_device_late
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* to finish the eeh setup for this device.
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*/
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void eeh_add_device_tree_early(struct device_node *);
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void eeh_add_device_tree_late(struct pci_bus *);
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/**
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* eeh_remove_device_recursive - undo EEH for device & children.
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* @dev: pci device to be removed
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*
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* As above, this removes the device; it also removes child
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* pci devices as well.
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*/
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void eeh_remove_bus_device(struct pci_dev *);
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/**
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@ -47,92 +47,27 @@ extern int rtas_setup_phb(struct pci_controller *phb);
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extern unsigned long pci_probe_only;
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/* ---- EEH internal-use-only related routines ---- */
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#ifdef CONFIG_EEH
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void pci_addr_cache_insert_device(struct pci_dev *dev);
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void pci_addr_cache_remove_device(struct pci_dev *dev);
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void pci_addr_cache_build(void);
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struct pci_dev *pci_get_device_by_addr(unsigned long addr);
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/**
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* eeh_slot_error_detail -- record and EEH error condition to the log
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* @pdn: pci device node
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* @severity: EEH_LOG_TEMP_FAILURE or EEH_LOG_PERM_FAILURE
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*
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* Obtains the EEH error details from the RTAS subsystem,
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* and then logs these details with the RTAS error log system.
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*/
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#define EEH_LOG_TEMP_FAILURE 1
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#define EEH_LOG_PERM_FAILURE 2
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void eeh_slot_error_detail (struct pci_dn *pdn, int severity);
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/**
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* rtas_pci_enable - enable IO transfers for this slot
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* @pdn: pci device node
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* @function: either EEH_THAW_MMIO or EEH_THAW_DMA
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*
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* Enable I/O transfers to this slot
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*/
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#define EEH_THAW_MMIO 2
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#define EEH_THAW_DMA 3
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int rtas_pci_enable(struct pci_dn *pdn, int function);
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/**
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* rtas_set_slot_reset -- unfreeze a frozen slot
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* @pdn: pci device node
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*
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* Clear the EEH-frozen condition on a slot. This routine
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* does this by asserting the PCI #RST line for 1/8th of
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* a second; this routine will sleep while the adapter is
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* being reset.
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*
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* Returns a non-zero value if the reset failed.
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*/
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int rtas_set_slot_reset (struct pci_dn *);
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int eeh_wait_for_slot_status(struct pci_dn *pdn, int max_wait_msecs);
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/**
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* eeh_restore_bars - Restore device configuration info.
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* @pdn: pci device node
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*
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* A reset of a PCI device will clear out its config space.
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* This routines will restore the config space for this
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* device, and is children, to values previously obtained
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* from the firmware.
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*/
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void eeh_restore_bars(struct pci_dn *);
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/**
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* rtas_configure_bridge -- firmware initialization of pci bridge
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* @pdn: pci device node
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*
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* Ask the firmware to configure all PCI bridges devices
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* located behind the indicated node. Required after a
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* pci device reset. Does essentially the same hing as
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* eeh_restore_bars, but for brdges, and lets firmware
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* do the work.
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*/
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void rtas_configure_bridge(struct pci_dn *);
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int rtas_write_config(struct pci_dn *, int where, int size, u32 val);
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int rtas_read_config(struct pci_dn *, int where, int size, u32 *val);
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/**
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* eeh_mark_slot -- set mode flags for pertition endpoint
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* @pdn: pci device node
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*
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* mark and clear slots: find "partition endpoint" PE and set or
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* clear the flags for each subnode of the PE.
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*/
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void eeh_mark_slot (struct device_node *dn, int mode_flag);
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void eeh_clear_slot (struct device_node *dn, int mode_flag);
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/**
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* find_device_pe -- Find the associated "Partiationable Endpoint" PE
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* @pdn: pci device node
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*/
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struct device_node * find_device_pe(struct device_node *dn);
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void eeh_mark_slot(struct device_node *dn, int mode_flag);
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void eeh_clear_slot(struct device_node *dn, int mode_flag);
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struct device_node *find_device_pe(struct device_node *dn);
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void eeh_sysfs_add_device(struct pci_dev *pdev);
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void eeh_sysfs_remove_device(struct pci_dev *pdev);
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@ -1,8 +1,8 @@
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/*
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* eeh.c
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* Copyright IBM Corporation 2001, 2005, 2006
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* Copyright Dave Engebretsen & Todd Inglett 2001
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* Copyright Linas Vepstas 2005, 2006
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* Copyright 2001-2012 IBM Corporation.
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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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@ -22,7 +22,7 @@
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*/
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#include <linux/delay.h>
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#include <linux/sched.h> /* for init_mm */
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/pci.h>
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@ -129,9 +129,16 @@ static unsigned long slot_resets;
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#define IS_BRIDGE(class_code) (((class_code)<<16) == PCI_BASE_CLASS_BRIDGE)
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/* --------------------------------------------------------------- */
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/* Below lies the EEH event infrastructure */
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/**
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* rtas_slot_error_detail - Retrieve error log through RTAS call
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* @pdn: device node
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* @severity: temporary or permanent error log
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* @driver_log: driver log to be combined with the retrieved error log
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* @loglen: length of driver log
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*
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* This routine should be called to retrieve error log through the dedicated
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* RTAS call.
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*/
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static void rtas_slot_error_detail(struct pci_dn *pdn, int severity,
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char *driver_log, size_t loglen)
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{
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@ -163,7 +170,7 @@ static void rtas_slot_error_detail(struct pci_dn *pdn, int severity,
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}
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/**
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* gather_pci_data - copy assorted PCI config space registers to buff
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* gather_pci_data - Copy assorted PCI config space registers to buff
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* @pdn: device to report data for
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* @buf: point to buffer in which to log
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* @len: amount of room in buffer
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@ -258,6 +265,16 @@ static size_t gather_pci_data(struct pci_dn *pdn, char * buf, size_t len)
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return n;
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}
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/**
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* eeh_slot_error_detail - Generate combined log including driver log and error log
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* @pdn: device node
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* @severity: temporary or permanent error log
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*
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* This routine should be called to generate the combined log, which
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* is comprised of driver log and error log. The driver log is figured
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* out from the config space of the corresponding PCI device, while
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* the error log is fetched through platform dependent function call.
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*/
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void eeh_slot_error_detail(struct pci_dn *pdn, int severity)
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{
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size_t loglen = 0;
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@ -275,6 +292,9 @@ void eeh_slot_error_detail(struct pci_dn *pdn, int severity)
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* read_slot_reset_state - Read the reset state of a device node's slot
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* @dn: device node to read
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* @rets: array to return results in
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*
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* Read the reset state of a device node's slot through platform dependent
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* function call.
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*/
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static int read_slot_reset_state(struct pci_dn *pdn, int rets[])
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{
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@ -300,9 +320,9 @@ static int read_slot_reset_state(struct pci_dn *pdn, int rets[])
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}
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/**
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* eeh_wait_for_slot_status - returns error status of slot
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* @pdn pci device node
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* @max_wait_msecs maximum number to millisecs to wait
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* eeh_wait_for_slot_status - Returns error status of slot
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* @pdn: pci device node
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* @max_wait_msecs: maximum number to millisecs to wait
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*
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* Return negative value if a permanent error, else return
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* Partition Endpoint (PE) status value.
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@ -332,16 +352,16 @@ eeh_wait_for_slot_status(struct pci_dn *pdn, int max_wait_msecs)
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mwait = rets[2];
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if (mwait <= 0) {
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printk (KERN_WARNING
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"EEH: Firmware returned bad wait value=%d\n", mwait);
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printk(KERN_WARNING "EEH: Firmware returned bad wait value=%d\n",
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mwait);
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mwait = 1000;
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} else if (mwait > 300*1000) {
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printk (KERN_WARNING
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"EEH: Firmware is taking too long, time=%d\n", mwait);
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printk(KERN_WARNING "EEH: Firmware is taking too long, time=%d\n",
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mwait);
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mwait = 300*1000;
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}
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max_wait_msecs -= mwait;
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msleep (mwait);
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msleep(mwait);
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}
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printk(KERN_WARNING "EEH: Timed out waiting for slot status\n");
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@ -349,8 +369,11 @@ eeh_wait_for_slot_status(struct pci_dn *pdn, int max_wait_msecs)
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}
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/**
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* eeh_token_to_phys - convert EEH address token to phys address
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* @token i/o token, should be address in the form 0xA....
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* eeh_token_to_phys - Convert EEH address token to phys address
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* @token: I/O token, should be address in the form 0xA....
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*
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* This routine should be called to convert virtual I/O address
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* to physical one.
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*/
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static inline unsigned long eeh_token_to_phys(unsigned long token)
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{
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@ -365,8 +388,11 @@ static inline unsigned long eeh_token_to_phys(unsigned long token)
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return pa | (token & (PAGE_SIZE-1));
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}
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/**
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* Return the "partitionable endpoint" (pe) under which this device lies
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/**
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* find_device_pe - Retrieve the PE for the given device
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* @dn: device node
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*
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* Return the PE under which this device lies
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*/
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struct device_node * find_device_pe(struct device_node *dn)
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{
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@ -377,14 +403,18 @@ struct device_node * find_device_pe(struct device_node *dn)
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return dn;
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}
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/** Mark all devices that are children of this device as failed.
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* Mark the device driver too, so that it can see the failure
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* immediately; this is critical, since some drivers poll
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* status registers in interrupts ... If a driver is polling,
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* and the slot is frozen, then the driver can deadlock in
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* an interrupt context, which is bad.
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/**
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* __eeh_mark_slot - Mark all child devices as failed
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* @parent: parent device
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* @mode_flag: failure flag
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*
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* Mark all devices that are children of this device as failed.
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* Mark the device driver too, so that it can see the failure
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* immediately; this is critical, since some drivers poll
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* status registers in interrupts ... If a driver is polling,
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* and the slot is frozen, then the driver can deadlock in
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* an interrupt context, which is bad.
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*/
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static void __eeh_mark_slot(struct device_node *parent, int mode_flag)
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{
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struct device_node *dn;
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@ -404,10 +434,18 @@ static void __eeh_mark_slot(struct device_node *parent, int mode_flag)
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}
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}
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void eeh_mark_slot (struct device_node *dn, int mode_flag)
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/**
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* eeh_mark_slot - Mark the indicated device and its children as failed
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* @dn: parent device
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* @mode_flag: failure flag
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*
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* Mark the indicated device and its child devices as failed.
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* The device drivers are marked as failed as well.
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*/
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void eeh_mark_slot(struct device_node *dn, int mode_flag)
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{
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struct pci_dev *dev;
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dn = find_device_pe (dn);
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dn = find_device_pe(dn);
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/* Back up one, since config addrs might be shared */
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if (!pcibios_find_pci_bus(dn) && PCI_DN(dn->parent))
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@ -423,6 +461,13 @@ void eeh_mark_slot (struct device_node *dn, int mode_flag)
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__eeh_mark_slot(dn, mode_flag);
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}
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/**
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* __eeh_clear_slot - Clear failure flag for the child devices
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* @parent: parent device
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* @mode_flag: flag to be cleared
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*
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* Clear failure flag for the child devices.
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*/
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static void __eeh_clear_slot(struct device_node *parent, int mode_flag)
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{
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struct device_node *dn;
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@ -436,12 +481,19 @@ static void __eeh_clear_slot(struct device_node *parent, int mode_flag)
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}
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}
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void eeh_clear_slot (struct device_node *dn, int mode_flag)
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/**
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* eeh_clear_slot - Clear failure flag for the indicated device and its children
|
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* @dn: parent device
|
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* @mode_flag: flag to be cleared
|
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*
|
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* Clear failure flag for the indicated device and its children.
|
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*/
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void eeh_clear_slot(struct device_node *dn, int mode_flag)
|
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{
|
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unsigned long flags;
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raw_spin_lock_irqsave(&confirm_error_lock, flags);
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|
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dn = find_device_pe (dn);
|
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dn = find_device_pe(dn);
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/* Back up one, since config addrs might be shared */
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if (!pcibios_find_pci_bus(dn) && PCI_DN(dn->parent))
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@ -453,43 +505,10 @@ void eeh_clear_slot (struct device_node *dn, int mode_flag)
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raw_spin_unlock_irqrestore(&confirm_error_lock, flags);
|
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}
|
||||
|
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void __eeh_set_pe_freset(struct device_node *parent, unsigned int *freset)
|
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{
|
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struct device_node *dn;
|
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|
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for_each_child_of_node(parent, dn) {
|
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if (PCI_DN(dn)) {
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|
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struct pci_dev *dev = PCI_DN(dn)->pcidev;
|
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|
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if (dev && dev->driver)
|
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*freset |= dev->needs_freset;
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|
||||
__eeh_set_pe_freset(dn, freset);
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}
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}
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}
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void eeh_set_pe_freset(struct device_node *dn, unsigned int *freset)
|
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{
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struct pci_dev *dev;
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dn = find_device_pe(dn);
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|
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/* Back up one, since config addrs might be shared */
|
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if (!pcibios_find_pci_bus(dn) && PCI_DN(dn->parent))
|
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dn = dn->parent;
|
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|
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dev = PCI_DN(dn)->pcidev;
|
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if (dev)
|
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*freset |= dev->needs_freset;
|
||||
|
||||
__eeh_set_pe_freset(dn, freset);
|
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}
|
||||
|
||||
/**
|
||||
* eeh_dn_check_failure - check if all 1's data is due to EEH slot freeze
|
||||
* @dn device node
|
||||
* @dev pci device, if known
|
||||
* eeh_dn_check_failure - Check if all 1's data is due to EEH slot freeze
|
||||
* @dn: device node
|
||||
* @dev: pci device, if known
|
||||
*
|
||||
* Check for an EEH failure for the given device node. Call this
|
||||
* routine if the result of a read was all 0xff's and you want to
|
||||
|
|
@ -548,11 +567,11 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
|
|||
pdn->eeh_check_count ++;
|
||||
if (pdn->eeh_check_count % EEH_MAX_FAILS == 0) {
|
||||
location = of_get_property(dn, "ibm,loc-code", NULL);
|
||||
printk (KERN_ERR "EEH: %d reads ignored for recovering device at "
|
||||
printk(KERN_ERR "EEH: %d reads ignored for recovering device at "
|
||||
"location=%s driver=%s pci addr=%s\n",
|
||||
pdn->eeh_check_count, location,
|
||||
eeh_driver_name(dev), eeh_pci_name(dev));
|
||||
printk (KERN_ERR "EEH: Might be infinite loop in %s driver\n",
|
||||
printk(KERN_ERR "EEH: Might be infinite loop in %s driver\n",
|
||||
eeh_driver_name(dev));
|
||||
dump_stack();
|
||||
}
|
||||
|
|
@ -579,7 +598,8 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
|
|||
}
|
||||
|
||||
/* Note that config-io to empty slots may fail;
|
||||
* they are empty when they don't have children. */
|
||||
* they are empty when they don't have children.
|
||||
*/
|
||||
if ((rets[0] == 5) && (rets[2] == 0) && (dn->child == NULL)) {
|
||||
false_positives++;
|
||||
pdn->eeh_false_positives ++;
|
||||
|
|
@ -609,15 +629,17 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
|
|||
|
||||
/* Avoid repeated reports of this failure, including problems
|
||||
* with other functions on this device, and functions under
|
||||
* bridges. */
|
||||
eeh_mark_slot (dn, EEH_MODE_ISOLATED);
|
||||
* bridges.
|
||||
*/
|
||||
eeh_mark_slot(dn, EEH_MODE_ISOLATED);
|
||||
raw_spin_unlock_irqrestore(&confirm_error_lock, flags);
|
||||
|
||||
eeh_send_failure_event (dn, dev);
|
||||
eeh_send_failure_event(dn, dev);
|
||||
|
||||
/* Most EEH events are due to device driver bugs. Having
|
||||
* a stack trace will help the device-driver authors figure
|
||||
* out what happened. So print that out. */
|
||||
* out what happened. So print that out.
|
||||
*/
|
||||
dump_stack();
|
||||
return 1;
|
||||
|
||||
|
|
@ -629,9 +651,9 @@ dn_unlock:
|
|||
EXPORT_SYMBOL_GPL(eeh_dn_check_failure);
|
||||
|
||||
/**
|
||||
* eeh_check_failure - check if all 1's data is due to EEH slot freeze
|
||||
* @token i/o token, should be address in the form 0xA....
|
||||
* @val value, should be all 1's (XXX why do we need this arg??)
|
||||
* eeh_check_failure - Check if all 1's data is due to EEH slot freeze
|
||||
* @token: I/O token, should be address in the form 0xA....
|
||||
* @val: value, should be all 1's (XXX why do we need this arg??)
|
||||
*
|
||||
* Check for an EEH failure at the given token address. Call this
|
||||
* routine if the result of a read was all 0xff's and you want to
|
||||
|
|
@ -655,7 +677,7 @@ unsigned long eeh_check_failure(const volatile void __iomem *token, unsigned lon
|
|||
}
|
||||
|
||||
dn = pci_device_to_OF_node(dev);
|
||||
eeh_dn_check_failure (dn, dev);
|
||||
eeh_dn_check_failure(dn, dev);
|
||||
|
||||
pci_dev_put(dev);
|
||||
return val;
|
||||
|
|
@ -663,14 +685,15 @@ unsigned long eeh_check_failure(const volatile void __iomem *token, unsigned lon
|
|||
|
||||
EXPORT_SYMBOL(eeh_check_failure);
|
||||
|
||||
/* ------------------------------------------------------------- */
|
||||
/* The code below deals with error recovery */
|
||||
|
||||
/**
|
||||
* rtas_pci_enable - enable MMIO or DMA transfers for this slot
|
||||
* rtas_pci_enable - Enable MMIO or DMA transfers for this slot
|
||||
* @pdn pci device node
|
||||
*
|
||||
* This routine should be called to reenable frozen MMIO or DMA
|
||||
* so that it would work correctly again. It's useful while doing
|
||||
* recovery or log collection on the indicated device.
|
||||
*/
|
||||
|
||||
int
|
||||
rtas_pci_enable(struct pci_dn *pdn, int function)
|
||||
{
|
||||
|
|
@ -692,7 +715,7 @@ rtas_pci_enable(struct pci_dn *pdn, int function)
|
|||
printk(KERN_WARNING "EEH: Unexpected state change %d, err=%d dn=%s\n",
|
||||
function, rc, pdn->node->full_name);
|
||||
|
||||
rc = eeh_wait_for_slot_status (pdn, PCI_BUS_RESET_WAIT_MSEC);
|
||||
rc = eeh_wait_for_slot_status(pdn, PCI_BUS_RESET_WAIT_MSEC);
|
||||
if ((rc == 4) && (function == EEH_THAW_MMIO))
|
||||
return 0;
|
||||
|
||||
|
|
@ -700,27 +723,25 @@ rtas_pci_enable(struct pci_dn *pdn, int function)
|
|||
}
|
||||
|
||||
/**
|
||||
* rtas_pci_slot_reset - raises/lowers the pci #RST line
|
||||
* @pdn pci device node
|
||||
* rtas_pci_slot_reset - Raises/Lowers the pci #RST line
|
||||
* @pdn: pci device node
|
||||
* @state: 1/0 to raise/lower the #RST
|
||||
*
|
||||
* Clear the EEH-frozen condition on a slot. This routine
|
||||
* asserts the PCI #RST line if the 'state' argument is '1',
|
||||
* and drops the #RST line if 'state is '0'. This routine is
|
||||
* safe to call in an interrupt context.
|
||||
*
|
||||
*/
|
||||
|
||||
static void
|
||||
rtas_pci_slot_reset(struct pci_dn *pdn, int state)
|
||||
{
|
||||
int config_addr;
|
||||
int rc;
|
||||
|
||||
BUG_ON (pdn==NULL);
|
||||
BUG_ON(pdn==NULL);
|
||||
|
||||
if (!pdn->phb) {
|
||||
printk (KERN_WARNING "EEH: in slot reset, device node %s has no phb\n",
|
||||
printk(KERN_WARNING "EEH: in slot reset, device node %s has no phb\n",
|
||||
pdn->node->full_name);
|
||||
return;
|
||||
}
|
||||
|
|
@ -752,12 +773,12 @@ rtas_pci_slot_reset(struct pci_dn *pdn, int state)
|
|||
|
||||
/**
|
||||
* pcibios_set_pcie_slot_reset - Set PCI-E reset state
|
||||
* @dev: pci device struct
|
||||
* @state: reset state to enter
|
||||
* @dev: pci device struct
|
||||
* @state: reset state to enter
|
||||
*
|
||||
* Return value:
|
||||
* 0 if success
|
||||
**/
|
||||
*/
|
||||
int pcibios_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state)
|
||||
{
|
||||
struct device_node *dn = pci_device_to_OF_node(dev);
|
||||
|
|
@ -781,10 +802,62 @@ int pcibios_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state stat
|
|||
}
|
||||
|
||||
/**
|
||||
* rtas_set_slot_reset -- assert the pci #RST line for 1/4 second
|
||||
* @pdn: pci device node to be reset.
|
||||
* __eeh_set_pe_freset - Check the required reset for child devices
|
||||
* @parent: parent device
|
||||
* @freset: return value
|
||||
*
|
||||
* Each device might have its preferred reset type: fundamental or
|
||||
* hot reset. The routine is used to collect the information from
|
||||
* the child devices so that they could be reset accordingly.
|
||||
*/
|
||||
void __eeh_set_pe_freset(struct device_node *parent, unsigned int *freset)
|
||||
{
|
||||
struct device_node *dn;
|
||||
|
||||
for_each_child_of_node(parent, dn) {
|
||||
if (PCI_DN(dn)) {
|
||||
struct pci_dev *dev = PCI_DN(dn)->pcidev;
|
||||
|
||||
if (dev && dev->driver)
|
||||
*freset |= dev->needs_freset;
|
||||
|
||||
__eeh_set_pe_freset(dn, freset);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* eeh_set_pe_freset - Check the required reset for the indicated device and its children
|
||||
* @dn: parent device
|
||||
* @freset: return value
|
||||
*
|
||||
* Each device might have its preferred reset type: fundamental or
|
||||
* hot reset. The routine is used to collected the information for
|
||||
* the indicated device and its children so that the bunch of the
|
||||
* devices could be reset properly.
|
||||
*/
|
||||
void eeh_set_pe_freset(struct device_node *dn, unsigned int *freset)
|
||||
{
|
||||
struct pci_dev *dev;
|
||||
dn = find_device_pe(dn);
|
||||
|
||||
/* Back up one, since config addrs might be shared */
|
||||
if (!pcibios_find_pci_bus(dn) && PCI_DN(dn->parent))
|
||||
dn = dn->parent;
|
||||
|
||||
dev = PCI_DN(dn)->pcidev;
|
||||
if (dev)
|
||||
*freset |= dev->needs_freset;
|
||||
|
||||
__eeh_set_pe_freset(dn, freset);
|
||||
}
|
||||
|
||||
/**
|
||||
* __rtas_set_slot_reset - Assert the pci #RST line for 1/4 second
|
||||
* @pdn: pci device node to be reset.
|
||||
*
|
||||
* Assert the PCI #RST line for 1/4 second.
|
||||
*/
|
||||
static void __rtas_set_slot_reset(struct pci_dn *pdn)
|
||||
{
|
||||
unsigned int freset = 0;
|
||||
|
|
@ -803,25 +876,35 @@ static void __rtas_set_slot_reset(struct pci_dn *pdn)
|
|||
rtas_pci_slot_reset(pdn, 1);
|
||||
|
||||
/* The PCI bus requires that the reset be held high for at least
|
||||
* a 100 milliseconds. We wait a bit longer 'just in case'. */
|
||||
|
||||
* a 100 milliseconds. We wait a bit longer 'just in case'.
|
||||
*/
|
||||
#define PCI_BUS_RST_HOLD_TIME_MSEC 250
|
||||
msleep (PCI_BUS_RST_HOLD_TIME_MSEC);
|
||||
msleep(PCI_BUS_RST_HOLD_TIME_MSEC);
|
||||
|
||||
/* We might get hit with another EEH freeze as soon as the
|
||||
* pci slot reset line is dropped. Make sure we don't miss
|
||||
* these, and clear the flag now. */
|
||||
eeh_clear_slot (pdn->node, EEH_MODE_ISOLATED);
|
||||
* these, and clear the flag now.
|
||||
*/
|
||||
eeh_clear_slot(pdn->node, EEH_MODE_ISOLATED);
|
||||
|
||||
rtas_pci_slot_reset (pdn, 0);
|
||||
rtas_pci_slot_reset(pdn, 0);
|
||||
|
||||
/* After a PCI slot has been reset, the PCI Express spec requires
|
||||
* a 1.5 second idle time for the bus to stabilize, before starting
|
||||
* up traffic. */
|
||||
* up traffic.
|
||||
*/
|
||||
#define PCI_BUS_SETTLE_TIME_MSEC 1800
|
||||
msleep (PCI_BUS_SETTLE_TIME_MSEC);
|
||||
msleep(PCI_BUS_SETTLE_TIME_MSEC);
|
||||
}
|
||||
|
||||
/**
|
||||
* rtas_set_slot_reset - Reset the indicated PE
|
||||
* @pdn: PCI device node
|
||||
*
|
||||
* This routine should be called to reset indicated device, including
|
||||
* PE. A PE might include multiple PCI devices and sometimes PCI bridges
|
||||
* might be involved as well.
|
||||
*/
|
||||
int rtas_set_slot_reset(struct pci_dn *pdn)
|
||||
{
|
||||
int i, rc;
|
||||
|
|
@ -846,7 +929,6 @@ int rtas_set_slot_reset(struct pci_dn *pdn)
|
|||
return -1;
|
||||
}
|
||||
|
||||
/* ------------------------------------------------------- */
|
||||
/** Save and restore of PCI BARs
|
||||
*
|
||||
* Although firmware will set up BARs during boot, it doesn't
|
||||
|
|
@ -863,7 +945,7 @@ int rtas_set_slot_reset(struct pci_dn *pdn)
|
|||
* the expansion ROM base address, the latency timer, and etc.
|
||||
* from the saved values in the device node.
|
||||
*/
|
||||
static inline void __restore_bars (struct pci_dn *pdn)
|
||||
static inline void __restore_bars(struct pci_dn *pdn)
|
||||
{
|
||||
int i;
|
||||
u32 cmd;
|
||||
|
|
@ -879,17 +961,18 @@ static inline void __restore_bars (struct pci_dn *pdn)
|
|||
#define BYTE_SWAP(OFF) (8*((OFF)/4)+3-(OFF))
|
||||
#define SAVED_BYTE(OFF) (((u8 *)(pdn->config_space))[BYTE_SWAP(OFF)])
|
||||
|
||||
rtas_write_config (pdn, PCI_CACHE_LINE_SIZE, 1,
|
||||
rtas_write_config(pdn, PCI_CACHE_LINE_SIZE, 1,
|
||||
SAVED_BYTE(PCI_CACHE_LINE_SIZE));
|
||||
|
||||
rtas_write_config (pdn, PCI_LATENCY_TIMER, 1,
|
||||
rtas_write_config(pdn, PCI_LATENCY_TIMER, 1,
|
||||
SAVED_BYTE(PCI_LATENCY_TIMER));
|
||||
|
||||
/* max latency, min grant, interrupt pin and line */
|
||||
rtas_write_config(pdn, 15*4, 4, pdn->config_space[15]);
|
||||
|
||||
/* Restore PERR & SERR bits, some devices require it,
|
||||
don't touch the other command bits */
|
||||
* don't touch the other command bits
|
||||
*/
|
||||
rtas_read_config(pdn, PCI_COMMAND, 4, &cmd);
|
||||
if (pdn->config_space[1] & PCI_COMMAND_PARITY)
|
||||
cmd |= PCI_COMMAND_PARITY;
|
||||
|
|
@ -903,7 +986,8 @@ static inline void __restore_bars (struct pci_dn *pdn)
|
|||
}
|
||||
|
||||
/**
|
||||
* eeh_restore_bars - restore the PCI config space info
|
||||
* eeh_restore_bars - Restore the PCI config space info
|
||||
* @pdn: PCI device node
|
||||
*
|
||||
* This routine performs a recursive walk to the children
|
||||
* of this device as well.
|
||||
|
|
@ -915,14 +999,15 @@ void eeh_restore_bars(struct pci_dn *pdn)
|
|||
return;
|
||||
|
||||
if ((pdn->eeh_mode & EEH_MODE_SUPPORTED) && !IS_BRIDGE(pdn->class_code))
|
||||
__restore_bars (pdn);
|
||||
__restore_bars(pdn);
|
||||
|
||||
for_each_child_of_node(pdn->node, dn)
|
||||
eeh_restore_bars (PCI_DN(dn));
|
||||
eeh_restore_bars(PCI_DN(dn));
|
||||
}
|
||||
|
||||
/**
|
||||
* eeh_save_bars - save device bars
|
||||
* eeh_save_bars - Save device bars
|
||||
* @pdn: PCI device node
|
||||
*
|
||||
* Save the values of the device bars. Unlike the restore
|
||||
* routine, this routine is *not* recursive. This is because
|
||||
|
|
@ -940,6 +1025,14 @@ static void eeh_save_bars(struct pci_dn *pdn)
|
|||
rtas_read_config(pdn, i * 4, 4, &pdn->config_space[i]);
|
||||
}
|
||||
|
||||
/**
|
||||
* rtas_configure_bridge - Configure PCI bridges for the indicated PE
|
||||
* @pdn: PCI device node
|
||||
*
|
||||
* PCI bridges might be included in PE. In order to make the PE work
|
||||
* again. The included PCI bridges should be recovered after the PE
|
||||
* encounters frozen state.
|
||||
*/
|
||||
void
|
||||
rtas_configure_bridge(struct pci_dn *pdn)
|
||||
{
|
||||
|
|
@ -963,17 +1056,11 @@ rtas_configure_bridge(struct pci_dn *pdn)
|
|||
BUID_HI(pdn->phb->buid),
|
||||
BUID_LO(pdn->phb->buid));
|
||||
if (rc) {
|
||||
printk (KERN_WARNING "EEH: Unable to configure device bridge (%d) for %s\n",
|
||||
printk(KERN_WARNING "EEH: Unable to configure device bridge (%d) for %s\n",
|
||||
rc, pdn->node->full_name);
|
||||
}
|
||||
}
|
||||
|
||||
/* ------------------------------------------------------------- */
|
||||
/* The code below deals with enabling EEH for devices during the
|
||||
* early boot sequence. EEH must be enabled before any PCI probing
|
||||
* can be done.
|
||||
*/
|
||||
|
||||
#define EEH_ENABLE 1
|
||||
|
||||
struct eeh_early_enable_info {
|
||||
|
|
@ -981,7 +1068,18 @@ struct eeh_early_enable_info {
|
|||
unsigned int buid_lo;
|
||||
};
|
||||
|
||||
static int get_pe_addr (int config_addr,
|
||||
/**
|
||||
* get_pe_addr - Retrieve PE address with given BDF address
|
||||
* @config_addr: BDF address
|
||||
* @info: BUID of the associated PHB
|
||||
*
|
||||
* There're 2 kinds of addresses existing in EEH core components:
|
||||
* BDF address and PE address. Besides, there has dedicated platform
|
||||
* dependent function call to retrieve the PE address according to
|
||||
* the given BDF address. Further more, we prefer PE address on BDF
|
||||
* address in EEH core components.
|
||||
*/
|
||||
static int get_pe_addr(int config_addr,
|
||||
struct eeh_early_enable_info *info)
|
||||
{
|
||||
unsigned int rets[3];
|
||||
|
|
@ -990,12 +1088,12 @@ static int get_pe_addr (int config_addr,
|
|||
/* Use latest config-addr token on power6 */
|
||||
if (ibm_get_config_addr_info2 != RTAS_UNKNOWN_SERVICE) {
|
||||
/* Make sure we have a PE in hand */
|
||||
ret = rtas_call (ibm_get_config_addr_info2, 4, 2, rets,
|
||||
ret = rtas_call(ibm_get_config_addr_info2, 4, 2, rets,
|
||||
config_addr, info->buid_hi, info->buid_lo, 1);
|
||||
if (ret || (rets[0]==0))
|
||||
return 0;
|
||||
|
||||
ret = rtas_call (ibm_get_config_addr_info2, 4, 2, rets,
|
||||
ret = rtas_call(ibm_get_config_addr_info2, 4, 2, rets,
|
||||
config_addr, info->buid_hi, info->buid_lo, 0);
|
||||
if (ret)
|
||||
return 0;
|
||||
|
|
@ -1004,7 +1102,7 @@ static int get_pe_addr (int config_addr,
|
|||
|
||||
/* Use older config-addr token on power5 */
|
||||
if (ibm_get_config_addr_info != RTAS_UNKNOWN_SERVICE) {
|
||||
ret = rtas_call (ibm_get_config_addr_info, 4, 2, rets,
|
||||
ret = rtas_call(ibm_get_config_addr_info, 4, 2, rets,
|
||||
config_addr, info->buid_hi, info->buid_lo, 0);
|
||||
if (ret)
|
||||
return 0;
|
||||
|
|
@ -1013,7 +1111,15 @@ static int get_pe_addr (int config_addr,
|
|||
return 0;
|
||||
}
|
||||
|
||||
/* Enable eeh for the given device node. */
|
||||
/**
|
||||
* early_enable_eeh - Early enable EEH on the indicated device
|
||||
* @dn: device node
|
||||
* @data: BUID
|
||||
*
|
||||
* Enable EEH functionality on the specified PCI device. The function
|
||||
* is expected to be called before real PCI probing is done. However,
|
||||
* the PHBs have been initialized at this point.
|
||||
*/
|
||||
static void *early_enable_eeh(struct device_node *dn, void *data)
|
||||
{
|
||||
unsigned int rets[3];
|
||||
|
|
@ -1047,7 +1153,8 @@ static void *early_enable_eeh(struct device_node *dn, void *data)
|
|||
pdn->class_code = *class_code;
|
||||
|
||||
/* Ok... see if this device supports EEH. Some do, some don't,
|
||||
* and the only way to find out is to check each and every one. */
|
||||
* and the only way to find out is to check each and every one.
|
||||
*/
|
||||
regs = of_get_property(dn, "reg", NULL);
|
||||
if (regs) {
|
||||
/* First register entry is addr (00BBSS00) */
|
||||
|
|
@ -1061,13 +1168,15 @@ static void *early_enable_eeh(struct device_node *dn, void *data)
|
|||
pdn->eeh_config_addr = regs[0];
|
||||
|
||||
/* If the newer, better, ibm,get-config-addr-info is supported,
|
||||
* then use that instead. */
|
||||
* then use that instead.
|
||||
*/
|
||||
pdn->eeh_pe_config_addr = get_pe_addr(pdn->eeh_config_addr, info);
|
||||
|
||||
/* Some older systems (Power4) allow the
|
||||
* ibm,set-eeh-option call to succeed even on nodes
|
||||
* where EEH is not supported. Verify support
|
||||
* explicitly. */
|
||||
* explicitly.
|
||||
*/
|
||||
ret = read_slot_reset_state(pdn, rets);
|
||||
if ((ret == 0) && (rets[1] == 1))
|
||||
enable = 1;
|
||||
|
|
@ -1083,7 +1192,8 @@ static void *early_enable_eeh(struct device_node *dn, void *data)
|
|||
} else {
|
||||
|
||||
/* This device doesn't support EEH, but it may have an
|
||||
* EEH parent, in which case we mark it as supported. */
|
||||
* EEH parent, in which case we mark it as supported.
|
||||
*/
|
||||
if (dn->parent && PCI_DN(dn->parent)
|
||||
&& (PCI_DN(dn->parent)->eeh_mode & EEH_MODE_SUPPORTED)) {
|
||||
/* Parent supports EEH. */
|
||||
|
|
@ -1101,7 +1211,9 @@ static void *early_enable_eeh(struct device_node *dn, void *data)
|
|||
return NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
/**
|
||||
* eeh_init - EEH initialization
|
||||
*
|
||||
* Initialize EEH by trying to enable it for all of the adapters in the system.
|
||||
* As a side effect we can determine here if eeh is supported at all.
|
||||
* Note that we leave EEH on so failed config cycles won't cause a machine
|
||||
|
|
@ -1133,7 +1245,7 @@ void __init eeh_init(void)
|
|||
ibm_slot_error_detail = rtas_token("ibm,slot-error-detail");
|
||||
ibm_get_config_addr_info = rtas_token("ibm,get-config-addr-info");
|
||||
ibm_get_config_addr_info2 = rtas_token("ibm,get-config-addr-info2");
|
||||
ibm_configure_bridge = rtas_token ("ibm,configure-bridge");
|
||||
ibm_configure_bridge = rtas_token("ibm,configure-bridge");
|
||||
ibm_configure_pe = rtas_token("ibm,configure-pe");
|
||||
|
||||
if (ibm_set_eeh_option == RTAS_UNKNOWN_SERVICE)
|
||||
|
|
@ -1170,7 +1282,7 @@ void __init eeh_init(void)
|
|||
}
|
||||
|
||||
/**
|
||||
* eeh_add_device_early - enable EEH for the indicated device_node
|
||||
* eeh_add_device_early - Enable EEH for the indicated device_node
|
||||
* @dn: device node for which to set up EEH
|
||||
*
|
||||
* This routine must be used to perform EEH initialization for PCI
|
||||
|
|
@ -1199,6 +1311,14 @@ static void eeh_add_device_early(struct device_node *dn)
|
|||
early_enable_eeh(dn, &info);
|
||||
}
|
||||
|
||||
/**
|
||||
* eeh_add_device_tree_early - Enable EEH for the indicated device
|
||||
* @dn: device node
|
||||
*
|
||||
* This routine must be used to perform EEH initialization for the
|
||||
* indicated PCI device that was added after system boot (e.g.
|
||||
* hotplug, dlpar).
|
||||
*/
|
||||
void eeh_add_device_tree_early(struct device_node *dn)
|
||||
{
|
||||
struct device_node *sib;
|
||||
|
|
@ -1210,7 +1330,7 @@ void eeh_add_device_tree_early(struct device_node *dn)
|
|||
EXPORT_SYMBOL_GPL(eeh_add_device_tree_early);
|
||||
|
||||
/**
|
||||
* eeh_add_device_late - perform EEH initialization for the indicated pci device
|
||||
* eeh_add_device_late - Perform EEH initialization for the indicated pci device
|
||||
* @dev: pci device for which to set up EEH
|
||||
*
|
||||
* This routine must be used to complete EEH initialization for PCI
|
||||
|
|
@ -1234,13 +1354,21 @@ static void eeh_add_device_late(struct pci_dev *dev)
|
|||
}
|
||||
WARN_ON(pdn->pcidev);
|
||||
|
||||
pci_dev_get (dev);
|
||||
pci_dev_get(dev);
|
||||
pdn->pcidev = dev;
|
||||
|
||||
pci_addr_cache_insert_device(dev);
|
||||
eeh_sysfs_add_device(dev);
|
||||
}
|
||||
|
||||
/**
|
||||
* eeh_add_device_tree_late - Perform EEH initialization for the indicated PCI bus
|
||||
* @bus: PCI bus
|
||||
*
|
||||
* This routine must be used to perform EEH initialization for PCI
|
||||
* devices which are attached to the indicated PCI bus. The PCI bus
|
||||
* is added after system boot through hotplug or dlpar.
|
||||
*/
|
||||
void eeh_add_device_tree_late(struct pci_bus *bus)
|
||||
{
|
||||
struct pci_dev *dev;
|
||||
|
|
@ -1257,7 +1385,7 @@ void eeh_add_device_tree_late(struct pci_bus *bus)
|
|||
EXPORT_SYMBOL_GPL(eeh_add_device_tree_late);
|
||||
|
||||
/**
|
||||
* eeh_remove_device - undo EEH setup for the indicated pci device
|
||||
* eeh_remove_device - Undo EEH setup for the indicated pci device
|
||||
* @dev: pci device to be removed
|
||||
*
|
||||
* This routine should be called when a device is removed from
|
||||
|
|
@ -1281,12 +1409,20 @@ static void eeh_remove_device(struct pci_dev *dev)
|
|||
return;
|
||||
}
|
||||
PCI_DN(dn)->pcidev = NULL;
|
||||
pci_dev_put (dev);
|
||||
pci_dev_put(dev);
|
||||
|
||||
pci_addr_cache_remove_device(dev);
|
||||
eeh_sysfs_remove_device(dev);
|
||||
}
|
||||
|
||||
/**
|
||||
* eeh_remove_bus_device - Undo EEH setup for the indicated PCI device
|
||||
* @dev: PCI device
|
||||
*
|
||||
* This routine must be called when a device is removed from the
|
||||
* running system through hotplug or dlpar. The corresponding
|
||||
* PCI address cache will be removed.
|
||||
*/
|
||||
void eeh_remove_bus_device(struct pci_dev *dev)
|
||||
{
|
||||
struct pci_bus *bus = dev->subordinate;
|
||||
|
|
|
|||
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