dect
/
linux-2.6
Archived
13
0
Fork 0
Code Releases Activity

ACPI, APEI, Printk queued error record before panic 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

59
drivers/acpi/apei/ghes.c
View File

@ -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! */