mirror of https://gitee.com/openkylin/linux.git
powerpc/pseries: Cleanup comments in EEH aux components
There're several EEH aux components and the patch does some cleanup
for them so that they look more clean.
* Duplicated comments have been removed from the header file.
* 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* Function calls "xxx ()" has been replaced by "xxx()".
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
parent
1823fbf119
commit
29f8bf1b7f
|
|
@ -1,6 +1,4 @@
|
|||
/*
|
||||
* eeh_event.h
|
||||
*
|
||||
* 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
|
||||
|
|
@ -22,32 +20,20 @@
|
|||
#define ASM_POWERPC_EEH_EVENT_H
|
||||
#ifdef __KERNEL__
|
||||
|
||||
/** EEH event -- structure holding pci controller data that describes
|
||||
* a change in the isolation status of a PCI slot. A pointer
|
||||
* to this struct is passed as the data pointer in a notify callback.
|
||||
/*
|
||||
* structure holding pci controller data that describes a
|
||||
* change in the isolation status of a PCI slot. A pointer
|
||||
* to this struct is passed as the data pointer in a notify
|
||||
* callback.
|
||||
*/
|
||||
struct eeh_event {
|
||||
struct list_head list;
|
||||
struct list_head list; /* to form event queue */
|
||||
struct device_node *dn; /* struct device node */
|
||||
struct pci_dev *dev; /* affected device */
|
||||
};
|
||||
|
||||
/**
|
||||
* eeh_send_failure_event - generate a PCI error event
|
||||
* @dev pci device
|
||||
*
|
||||
* This routine builds a PCI error event which will be delivered
|
||||
* to all listeners on the eeh_notifier_chain.
|
||||
*
|
||||
* This routine can be called within an interrupt context;
|
||||
* the actual event will be delivered in a normal context
|
||||
* (from a workqueue).
|
||||
*/
|
||||
int eeh_send_failure_event (struct device_node *dn,
|
||||
struct pci_dev *dev);
|
||||
|
||||
/* Main recovery function */
|
||||
struct pci_dn * handle_eeh_events (struct eeh_event *);
|
||||
int eeh_send_failure_event(struct device_node *dn, struct pci_dev *dev);
|
||||
struct pci_dn *handle_eeh_events(struct eeh_event *);
|
||||
|
||||
#endif /* __KERNEL__ */
|
||||
#endif /* ASM_POWERPC_EEH_EVENT_H */
|
||||
|
|
|
|||
|
|
@ -1,5 +1,4 @@
|
|||
/*
|
||||
* eeh_cache.c
|
||||
* PCI address cache; allows the lookup of PCI devices based on I/O address
|
||||
*
|
||||
* Copyright IBM Corporation 2004
|
||||
|
|
@ -47,8 +46,7 @@
|
|||
* than any hash algo I could think of for this problem, even
|
||||
* with the penalty of slow pointer chases for d-cache misses).
|
||||
*/
|
||||
struct pci_io_addr_range
|
||||
{
|
||||
struct pci_io_addr_range {
|
||||
struct rb_node rb_node;
|
||||
unsigned long addr_lo;
|
||||
unsigned long addr_hi;
|
||||
|
|
@ -56,8 +54,7 @@ struct pci_io_addr_range
|
|||
unsigned int flags;
|
||||
};
|
||||
|
||||
static struct pci_io_addr_cache
|
||||
{
|
||||
static struct pci_io_addr_cache {
|
||||
struct rb_root rb_root;
|
||||
spinlock_t piar_lock;
|
||||
} pci_io_addr_cache_root;
|
||||
|
|
@ -166,7 +163,7 @@ pci_addr_cache_insert(struct pci_dev *dev, unsigned long alo,
|
|||
|
||||
#ifdef DEBUG
|
||||
printk(KERN_DEBUG "PIAR: insert range=[%lx:%lx] dev=%s\n",
|
||||
alo, ahi, pci_name (dev));
|
||||
alo, ahi, pci_name(dev));
|
||||
#endif
|
||||
|
||||
rb_link_node(&piar->rb_node, parent, p);
|
||||
|
|
|
|||
|
|
@ -33,8 +33,14 @@
|
|||
#include <asm/prom.h>
|
||||
#include <asm/rtas.h>
|
||||
|
||||
|
||||
static inline const char * pcid_name (struct pci_dev *pdev)
|
||||
/**
|
||||
* eeh_pcid_name - Retrieve name of PCI device driver
|
||||
* @pdev: PCI device
|
||||
*
|
||||
* This routine is used to retrieve the name of PCI device driver
|
||||
* if that's valid.
|
||||
*/
|
||||
static inline const char *pcid_name(struct pci_dev *pdev)
|
||||
{
|
||||
if (pdev && pdev->dev.driver)
|
||||
return pdev->dev.driver->name;
|
||||
|
|
@ -64,7 +70,14 @@ static void print_device_node_tree(struct pci_dn *pdn, int dent)
|
|||
#endif
|
||||
|
||||
/**
|
||||
* eeh_disable_irq - disable interrupt for the recovering device
|
||||
* eeh_disable_irq - Disable interrupt for the recovering device
|
||||
* @dev: PCI device
|
||||
*
|
||||
* This routine must be called when reporting temporary or permanent
|
||||
* error to the particular PCI device to disable interrupt of that
|
||||
* device. If the device has enabled MSI or MSI-X interrupt, we needn't
|
||||
* do real work because EEH should freeze DMA transfers for those PCI
|
||||
* devices encountering EEH errors, which includes MSI or MSI-X.
|
||||
*/
|
||||
static void eeh_disable_irq(struct pci_dev *dev)
|
||||
{
|
||||
|
|
@ -85,7 +98,11 @@ static void eeh_disable_irq(struct pci_dev *dev)
|
|||
}
|
||||
|
||||
/**
|
||||
* eeh_enable_irq - enable interrupt for the recovering device
|
||||
* eeh_enable_irq - Enable interrupt for the recovering device
|
||||
* @dev: PCI device
|
||||
*
|
||||
* This routine must be called to enable interrupt while failed
|
||||
* device could be resumed.
|
||||
*/
|
||||
static void eeh_enable_irq(struct pci_dev *dev)
|
||||
{
|
||||
|
|
@ -97,15 +114,15 @@ static void eeh_enable_irq(struct pci_dev *dev)
|
|||
}
|
||||
}
|
||||
|
||||
/* ------------------------------------------------------- */
|
||||
/**
|
||||
* eeh_report_error - report pci error to each device driver
|
||||
* eeh_report_error - Report pci error to each device driver
|
||||
* @dev: PCI device
|
||||
* @userdata: return value
|
||||
*
|
||||
* Report an EEH error to each device driver, collect up and
|
||||
* merge the device driver responses. Cumulative response
|
||||
* passed back in "userdata".
|
||||
*/
|
||||
|
||||
static int eeh_report_error(struct pci_dev *dev, void *userdata)
|
||||
{
|
||||
enum pci_ers_result rc, *res = userdata;
|
||||
|
|
@ -122,7 +139,7 @@ static int eeh_report_error(struct pci_dev *dev, void *userdata)
|
|||
!driver->err_handler->error_detected)
|
||||
return 0;
|
||||
|
||||
rc = driver->err_handler->error_detected (dev, pci_channel_io_frozen);
|
||||
rc = driver->err_handler->error_detected(dev, pci_channel_io_frozen);
|
||||
|
||||
/* A driver that needs a reset trumps all others */
|
||||
if (rc == PCI_ERS_RESULT_NEED_RESET) *res = rc;
|
||||
|
|
@ -132,13 +149,14 @@ static int eeh_report_error(struct pci_dev *dev, void *userdata)
|
|||
}
|
||||
|
||||
/**
|
||||
* eeh_report_mmio_enabled - tell drivers that MMIO has been enabled
|
||||
* eeh_report_mmio_enabled - Tell drivers that MMIO has been enabled
|
||||
* @dev: PCI device
|
||||
* @userdata: return value
|
||||
*
|
||||
* Tells each device driver that IO ports, MMIO and config space I/O
|
||||
* are now enabled. Collects up and merges the device driver responses.
|
||||
* Cumulative response passed back in "userdata".
|
||||
*/
|
||||
|
||||
static int eeh_report_mmio_enabled(struct pci_dev *dev, void *userdata)
|
||||
{
|
||||
enum pci_ers_result rc, *res = userdata;
|
||||
|
|
@ -149,7 +167,7 @@ static int eeh_report_mmio_enabled(struct pci_dev *dev, void *userdata)
|
|||
!driver->err_handler->mmio_enabled)
|
||||
return 0;
|
||||
|
||||
rc = driver->err_handler->mmio_enabled (dev);
|
||||
rc = driver->err_handler->mmio_enabled(dev);
|
||||
|
||||
/* A driver that needs a reset trumps all others */
|
||||
if (rc == PCI_ERS_RESULT_NEED_RESET) *res = rc;
|
||||
|
|
@ -159,9 +177,15 @@ static int eeh_report_mmio_enabled(struct pci_dev *dev, void *userdata)
|
|||
}
|
||||
|
||||
/**
|
||||
* eeh_report_reset - tell device that slot has been reset
|
||||
* eeh_report_reset - Tell device that slot has been reset
|
||||
* @dev: PCI device
|
||||
* @userdata: return value
|
||||
*
|
||||
* This routine must be called while EEH tries to reset particular
|
||||
* PCI device so that the associated PCI device driver could take
|
||||
* some actions, usually to save data the driver needs so that the
|
||||
* driver can work again while the device is recovered.
|
||||
*/
|
||||
|
||||
static int eeh_report_reset(struct pci_dev *dev, void *userdata)
|
||||
{
|
||||
enum pci_ers_result rc, *res = userdata;
|
||||
|
|
@ -188,9 +212,14 @@ static int eeh_report_reset(struct pci_dev *dev, void *userdata)
|
|||
}
|
||||
|
||||
/**
|
||||
* eeh_report_resume - tell device to resume normal operations
|
||||
* eeh_report_resume - Tell device to resume normal operations
|
||||
* @dev: PCI device
|
||||
* @userdata: return value
|
||||
*
|
||||
* This routine must be called to notify the device driver that it
|
||||
* could resume so that the device driver can do some initialization
|
||||
* to make the recovered device work again.
|
||||
*/
|
||||
|
||||
static int eeh_report_resume(struct pci_dev *dev, void *userdata)
|
||||
{
|
||||
struct pci_driver *driver = dev->driver;
|
||||
|
|
@ -212,12 +241,13 @@ static int eeh_report_resume(struct pci_dev *dev, void *userdata)
|
|||
}
|
||||
|
||||
/**
|
||||
* eeh_report_failure - tell device driver that device is dead.
|
||||
* eeh_report_failure - Tell device driver that device is dead.
|
||||
* @dev: PCI device
|
||||
* @userdata: return value
|
||||
*
|
||||
* This informs the device driver that the device is permanently
|
||||
* dead, and that no further recovery attempts will be made on it.
|
||||
*/
|
||||
|
||||
static int eeh_report_failure(struct pci_dev *dev, void *userdata)
|
||||
{
|
||||
struct pci_driver *driver = dev->driver;
|
||||
|
|
@ -238,37 +268,16 @@ static int eeh_report_failure(struct pci_dev *dev, void *userdata)
|
|||
return 0;
|
||||
}
|
||||
|
||||
/* ------------------------------------------------------- */
|
||||
/**
|
||||
* handle_eeh_events -- reset a PCI device after hard lockup.
|
||||
* eeh_reset_device - Perform actual reset of a pci slot
|
||||
* @pe_dn: PE associated device node
|
||||
* @bus: PCI bus corresponding to the isolcated slot
|
||||
*
|
||||
* pSeries systems will isolate a PCI slot if the PCI-Host
|
||||
* bridge detects address or data parity errors, DMA's
|
||||
* occurring to wild addresses (which usually happen due to
|
||||
* bugs in device drivers or in PCI adapter firmware).
|
||||
* Slot isolations also occur if #SERR, #PERR or other misc
|
||||
* PCI-related errors are detected.
|
||||
*
|
||||
* Recovery process consists of unplugging the device driver
|
||||
* (which generated hotplug events to userspace), then issuing
|
||||
* a PCI #RST to the device, then reconfiguring the PCI config
|
||||
* space for all bridges & devices under this slot, and then
|
||||
* finally restarting the device drivers (which cause a second
|
||||
* set of hotplug events to go out to userspace).
|
||||
* This routine must be called to do reset on the indicated PE.
|
||||
* During the reset, udev might be invoked because those affected
|
||||
* PCI devices will be removed and then added.
|
||||
*/
|
||||
|
||||
/**
|
||||
* eeh_reset_device() -- perform actual reset of a pci slot
|
||||
* @bus: pointer to the pci bus structure corresponding
|
||||
* to the isolated slot. A non-null value will
|
||||
* cause all devices under the bus to be removed
|
||||
* and then re-added.
|
||||
* @pe_dn: pointer to a "Partionable Endpoint" device node.
|
||||
* This is the top-level structure on which pci
|
||||
* bus resets can be performed.
|
||||
*/
|
||||
|
||||
static int eeh_reset_device (struct pci_dn *pe_dn, struct pci_bus *bus)
|
||||
static int eeh_reset_device(struct pci_dn *pe_dn, struct pci_bus *bus)
|
||||
{
|
||||
struct device_node *dn;
|
||||
int cnt, rc;
|
||||
|
|
@ -281,7 +290,8 @@ static int eeh_reset_device (struct pci_dn *pe_dn, struct pci_bus *bus)
|
|||
|
||||
/* Reset the pci controller. (Asserts RST#; resets config space).
|
||||
* Reconfigure bridges and devices. Don't try to bring the system
|
||||
* up if the reset failed for some reason. */
|
||||
* up if the reset failed for some reason.
|
||||
*/
|
||||
rc = eeh_reset_pe(pe_dn);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
|
@ -308,7 +318,7 @@ static int eeh_reset_device (struct pci_dn *pe_dn, struct pci_bus *bus)
|
|||
* potentially weird things happen.
|
||||
*/
|
||||
if (bus) {
|
||||
ssleep (5);
|
||||
ssleep(5);
|
||||
pcibios_add_pci_devices(bus);
|
||||
}
|
||||
pe_dn->eeh_freeze_count = cnt;
|
||||
|
|
@ -321,7 +331,24 @@ static int eeh_reset_device (struct pci_dn *pe_dn, struct pci_bus *bus)
|
|||
*/
|
||||
#define MAX_WAIT_FOR_RECOVERY 150
|
||||
|
||||
struct pci_dn * handle_eeh_events (struct eeh_event *event)
|
||||
/**
|
||||
* eeh_handle_event - Reset a PCI device after hard lockup.
|
||||
* @event: EEH event
|
||||
*
|
||||
* While PHB detects address or data parity errors on particular PCI
|
||||
* slot, the associated PE will be frozen. Besides, DMA's occurring
|
||||
* to wild addresses (which usually happen due to bugs in device
|
||||
* drivers or in PCI adapter firmware) can cause EEH error. #SERR,
|
||||
* #PERR or other misc PCI-related errors also can trigger EEH errors.
|
||||
*
|
||||
* Recovery process consists of unplugging the device driver (which
|
||||
* generated hotplug events to userspace), then issuing a PCI #RST to
|
||||
* the device, then reconfiguring the PCI config space for all bridges
|
||||
* & devices under this slot, and then finally restarting the device
|
||||
* drivers (which cause a second set of hotplug events to go out to
|
||||
* userspace).
|
||||
*/
|
||||
struct pci_dn *handle_eeh_events(struct eeh_event *event)
|
||||
{
|
||||
struct device_node *frozen_dn;
|
||||
struct pci_dn *frozen_pdn;
|
||||
|
|
@ -350,9 +377,10 @@ struct pci_dn * handle_eeh_events (struct eeh_event *event)
|
|||
* which was always an EADS pci bridge. In the new style,
|
||||
* there might not be any EADS bridges, and even when there are,
|
||||
* the firmware marks them as "EEH incapable". So another
|
||||
* two-step is needed to find the pci bus.. */
|
||||
* two-step is needed to find the pci bus..
|
||||
*/
|
||||
if (!frozen_bus)
|
||||
frozen_bus = pcibios_find_pci_bus (frozen_dn->parent);
|
||||
frozen_bus = pcibios_find_pci_bus(frozen_dn->parent);
|
||||
|
||||
if (!frozen_bus) {
|
||||
printk(KERN_ERR "EEH: Cannot find PCI bus "
|
||||
|
|
@ -395,7 +423,8 @@ struct pci_dn * handle_eeh_events (struct eeh_event *event)
|
|||
pci_walk_bus(frozen_bus, eeh_report_error, &result);
|
||||
|
||||
/* Get the current PCI slot state. This can take a long time,
|
||||
* sometimes over 3 seconds for certain systems. */
|
||||
* sometimes over 3 seconds for certain systems.
|
||||
*/
|
||||
rc = eeh_ops->wait_state(frozen_pdn->node, MAX_WAIT_FOR_RECOVERY*1000);
|
||||
if (rc < 0 || rc == EEH_STATE_NOT_SUPPORT) {
|
||||
printk(KERN_WARNING "EEH: Permanent failure\n");
|
||||
|
|
@ -508,4 +537,3 @@ struct pci_dn * handle_eeh_events (struct eeh_event *event)
|
|||
return NULL;
|
||||
}
|
||||
|
||||
/* ---------- end of file ---------- */
|
||||
|
|
|
|||
|
|
@ -1,6 +1,4 @@
|
|||
/*
|
||||
* eeh_event.c
|
||||
*
|
||||
* 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
|
||||
|
|
@ -46,7 +44,7 @@ DECLARE_WORK(eeh_event_wq, eeh_thread_launcher);
|
|||
DEFINE_MUTEX(eeh_event_mutex);
|
||||
|
||||
/**
|
||||
* eeh_event_handler - dispatch EEH events.
|
||||
* eeh_event_handler - Dispatch EEH events.
|
||||
* @dummy - unused
|
||||
*
|
||||
* The detection of a frozen slot can occur inside an interrupt,
|
||||
|
|
@ -61,7 +59,7 @@ static int eeh_event_handler(void * dummy)
|
|||
struct eeh_event *event;
|
||||
struct pci_dn *pdn;
|
||||
|
||||
daemonize ("eehd");
|
||||
daemonize("eehd");
|
||||
set_current_state(TASK_INTERRUPTIBLE);
|
||||
|
||||
spin_lock_irqsave(&eeh_eventlist_lock, flags);
|
||||
|
|
@ -93,7 +91,7 @@ static int eeh_event_handler(void * dummy)
|
|||
|
||||
/* If there are no new errors after an hour, clear the counter. */
|
||||
if (pdn && pdn->eeh_freeze_count>0) {
|
||||
msleep_interruptible (3600*1000);
|
||||
msleep_interruptible(3600*1000);
|
||||
if (pdn->eeh_freeze_count>0)
|
||||
pdn->eeh_freeze_count--;
|
||||
}
|
||||
|
|
@ -102,8 +100,11 @@ static int eeh_event_handler(void * dummy)
|
|||
}
|
||||
|
||||
/**
|
||||
* eeh_thread_launcher
|
||||
* eeh_thread_launcher - Start kernel thread to handle EEH events
|
||||
* @dummy - unused
|
||||
*
|
||||
* This routine is called to start the kernel thread for processing
|
||||
* EEH event.
|
||||
*/
|
||||
static void eeh_thread_launcher(struct work_struct *dummy)
|
||||
{
|
||||
|
|
@ -112,14 +113,14 @@ static void eeh_thread_launcher(struct work_struct *dummy)
|
|||
}
|
||||
|
||||
/**
|
||||
* eeh_send_failure_event - generate a PCI error event
|
||||
* @dev pci device
|
||||
* eeh_send_failure_event - Generate a PCI error event
|
||||
* @dev: pci device
|
||||
*
|
||||
* This routine can be called within an interrupt context;
|
||||
* the actual event will be delivered in a normal context
|
||||
* (from a workqueue).
|
||||
*/
|
||||
int eeh_send_failure_event (struct device_node *dn,
|
||||
int eeh_send_failure_event(struct device_node *dn,
|
||||
struct pci_dev *dev)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
|
@ -135,7 +136,7 @@ int eeh_send_failure_event (struct device_node *dn,
|
|||
}
|
||||
event = kmalloc(sizeof(*event), GFP_ATOMIC);
|
||||
if (event == NULL) {
|
||||
printk (KERN_ERR "EEH: out of memory, event not handled\n");
|
||||
printk(KERN_ERR "EEH: out of memory, event not handled\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
|
@ -154,5 +155,3 @@ int eeh_send_failure_event (struct device_node *dn,
|
|||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/********************** END OF FILE ******************************/
|
||||
|
|
|
|||
|
|
@ -28,7 +28,7 @@
|
|||
#include <asm/pci-bridge.h>
|
||||
|
||||
/**
|
||||
* EEH_SHOW_ATTR -- create sysfs entry for eeh statistic
|
||||
* EEH_SHOW_ATTR -- Create sysfs entry for eeh statistic
|
||||
* @_name: name of file in sysfs directory
|
||||
* @_memb: name of member in struct pci_dn to access
|
||||
* @_format: printf format for display
|
||||
|
|
|
|||
Loading…
Reference in New Issue