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ACPI, APEI, Printk queued error record before panic

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Because printk is not safe inside NMI handler, the recoverable error
records received in NMI handler will be queued to be printked in a
delayed IRQ context via irq_work.  If a fatal error occurs after the
recoverable error and before the irq_work processed, we lost a error
report.

To solve the issue, the queued error records are printked in NMI
handler if system will go panic.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Huang Ying 2011-12-08 11:25:45 +08:00 committed by Len Brown
parent 5ba82ab534
commit 46d12f0bcb
1 changed files with 47 additions and 12 deletions
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59
drivers/acpi/apei/ghes.c
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@ -740,26 +740,34 @@ static int ghes_notify_sci(struct notifier_block *this,
return ret;
}
static void ghes_proc_in_irq(struct irq_work *irq_work)
static struct llist_node *llist_nodes_reverse(struct llist_node *llnode)
{
struct llist_node *llnode, *next, *tail = NULL;
struct ghes_estatus_node *estatus_node;
struct acpi_hest_generic *generic;
struct acpi_hest_generic_status *estatus;
u32 len, node_len;
struct llist_node *next, *tail = NULL;
/*
* Because the time order of estatus in list is reversed,
* revert it back to proper order.
*/
llnode = llist_del_all(&ghes_estatus_llist);
while (llnode) {
next = llnode->next;
llnode->next = tail;
tail = llnode;
llnode = next;
}
llnode = tail;
return tail;
}
static void ghes_proc_in_irq(struct irq_work *irq_work)
{
struct llist_node *llnode, *next;
struct ghes_estatus_node *estatus_node;
struct acpi_hest_generic *generic;
struct acpi_hest_generic_status *estatus;
u32 len, node_len;
llnode = llist_del_all(&ghes_estatus_llist);
/*
* Because the time order of estatus in list is reversed,
* revert it back to proper order.
*/
llnode = llist_nodes_reverse(llnode);
while (llnode) {
next = llnode->next;
estatus_node = llist_entry(llnode, struct ghes_estatus_node,
@ -779,6 +787,32 @@ static void ghes_proc_in_irq(struct irq_work *irq_work)
}
}
static void ghes_print_queued_estatus(void)
{
struct llist_node *llnode;
struct ghes_estatus_node *estatus_node;
struct acpi_hest_generic *generic;
struct acpi_hest_generic_status *estatus;
u32 len, node_len;
llnode = llist_del_all(&ghes_estatus_llist);
/*
* Because the time order of estatus in list is reversed,
* revert it back to proper order.
*/
llnode = llist_nodes_reverse(llnode);
while (llnode) {
estatus_node = llist_entry(llnode, struct ghes_estatus_node,
llnode);
estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
len = apei_estatus_len(estatus);
node_len = GHES_ESTATUS_NODE_LEN(len);
generic = estatus_node->generic;
ghes_print_estatus(NULL, generic, estatus);
llnode = llnode->next;
}
}
static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
{
struct ghes *ghes, *ghes_global = NULL;
@ -804,6 +838,7 @@ static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
if (sev_global >= GHES_SEV_PANIC) {
oops_begin();
ghes_print_queued_estatus();
__ghes_print_estatus(KERN_EMERG, ghes_global->generic,
ghes_global->estatus);
/* reboot to log the error! */