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[PATCH] ppc64: mark failed devices

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17-eeh-slot-marking-bug.patch

A device that experiences a PCI outage may be just one deivce out
of many that was affected. In order to avoid repeated reports of
a failure, the entire tree of affected devices should be marked
as failed. This patch marks up the entire tree.

Signed-off-by: Linas Vepstas <linas@linas.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Linas Vepstas 2005-11-03 18:50:48 -06:00 committed by Paul Mackerras
parent 0c95fbb256
commit d9564ad114
2 changed files with 39 additions and 16 deletions
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48
arch/powerpc/platforms/pseries/eeh.c
View file

@ -478,32 +478,47 @@ static struct device_node * find_device_pe(struct device_node *dn)
* an interrupt context, which is bad.
*/
static void __eeh_mark_slot (struct device_node *dn)
static void __eeh_mark_slot (struct device_node *dn, int mode_flag)
{
while (dn) {
PCI_DN(dn)->eeh_mode |= EEH_MODE_ISOLATED;
if (PCI_DN(dn)) {
PCI_DN(dn)->eeh_mode |= mode_flag;
if (dn->child)
__eeh_mark_slot (dn->child);
if (dn->child)
__eeh_mark_slot (dn->child, mode_flag);
}
dn = dn->sibling;
}
}
static void __eeh_clear_slot (struct device_node *dn)
void eeh_mark_slot (struct device_node *dn, int mode_flag)
{
dn = find_device_pe (dn);
PCI_DN(dn)->eeh_mode |= mode_flag;
__eeh_mark_slot (dn->child, mode_flag);
}
static void __eeh_clear_slot (struct device_node *dn, int mode_flag)
{
while (dn) {
PCI_DN(dn)->eeh_mode &= ~EEH_MODE_ISOLATED;
if (dn->child)
__eeh_clear_slot (dn->child);
if (PCI_DN(dn)) {
PCI_DN(dn)->eeh_mode &= ~mode_flag;
PCI_DN(dn)->eeh_check_count = 0;
if (dn->child)
__eeh_clear_slot (dn->child, mode_flag);
}
dn = dn->sibling;
}
}
static inline void eeh_clear_slot (struct device_node *dn)
void eeh_clear_slot (struct device_node *dn, int mode_flag)
{
unsigned long flags;
spin_lock_irqsave(&confirm_error_lock, flags);
__eeh_clear_slot (dn);
dn = find_device_pe (dn);
PCI_DN(dn)->eeh_mode &= ~mode_flag;
PCI_DN(dn)->eeh_check_count = 0;
__eeh_clear_slot (dn->child, mode_flag);
spin_unlock_irqrestore(&confirm_error_lock, flags);
}
@ -528,7 +543,6 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
int rets[3];
unsigned long flags;
struct pci_dn *pdn;
struct device_node *pe_dn;
int rc = 0;
__get_cpu_var(total_mmio_ffs)++;
@ -630,8 +644,7 @@ 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. */
pe_dn = find_device_pe (dn);
__eeh_mark_slot (pe_dn);
eeh_mark_slot (dn, EEH_MODE_ISOLATED);
spin_unlock_irqrestore(&confirm_error_lock, flags);
eeh_send_failure_event (dn, dev, rets[0], rets[2]);
@ -743,9 +756,6 @@ rtas_pci_slot_reset(struct pci_dn *pdn, int state)
rc, state, pdn->node->full_name);
return;
}
if (state == 0)
eeh_clear_slot (pdn->node->parent->child);
}
/** rtas_set_slot_reset -- assert the pci #RST line for 1/4 second
@ -764,6 +774,12 @@ rtas_set_slot_reset(struct pci_dn *pdn)
#define PCI_BUS_RST_HOLD_TIME_MSEC 250
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);
rtas_pci_slot_reset (pdn, 0);
/* After a PCI slot has been reset, the PCI Express spec requires

7
include/asm-powerpc/ppc-pci.h
View file

@ -87,6 +87,13 @@ void rtas_configure_bridge(struct pci_dn *);
int rtas_write_config(struct pci_dn *, int where, int size, u32 val);
/**
* mark and clear slots: find "partition endpoint" PE and set or
* clear the flags for each subnode of the PE.
*/
void eeh_mark_slot (struct device_node *dn, int mode_flag);
void eeh_clear_slot (struct device_node *dn, int mode_flag);
#endif
#endif /* _ASM_POWERPC_PPC_PCI_H */