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>
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@ -740,26 +740,34 @@ static int ghes_notify_sci(struct notifier_block *this,
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return ret;
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}
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static void ghes_proc_in_irq(struct irq_work *irq_work)
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static struct llist_node *llist_nodes_reverse(struct llist_node *llnode)
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{
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struct llist_node *llnode, *next, *tail = NULL;
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struct ghes_estatus_node *estatus_node;
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struct acpi_hest_generic *generic;
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struct acpi_hest_generic_status *estatus;
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u32 len, node_len;
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struct llist_node *next, *tail = NULL;
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/*
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* Because the time order of estatus in list is reversed,
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* revert it back to proper order.
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*/
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llnode = llist_del_all(&ghes_estatus_llist);
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while (llnode) {
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next = llnode->next;
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llnode->next = tail;
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tail = llnode;
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llnode = next;
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}
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llnode = tail;
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return tail;
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}
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static void ghes_proc_in_irq(struct irq_work *irq_work)
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{
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struct llist_node *llnode, *next;
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struct ghes_estatus_node *estatus_node;
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struct acpi_hest_generic *generic;
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struct acpi_hest_generic_status *estatus;
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u32 len, node_len;
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llnode = llist_del_all(&ghes_estatus_llist);
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/*
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* Because the time order of estatus in list is reversed,
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* revert it back to proper order.
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*/
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llnode = llist_nodes_reverse(llnode);
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while (llnode) {
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next = llnode->next;
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estatus_node = llist_entry(llnode, struct ghes_estatus_node,
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@ -779,6 +787,32 @@ static void ghes_proc_in_irq(struct irq_work *irq_work)
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}
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}
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static void ghes_print_queued_estatus(void)
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{
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struct llist_node *llnode;
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struct ghes_estatus_node *estatus_node;
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struct acpi_hest_generic *generic;
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struct acpi_hest_generic_status *estatus;
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u32 len, node_len;
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llnode = llist_del_all(&ghes_estatus_llist);
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/*
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* Because the time order of estatus in list is reversed,
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* revert it back to proper order.
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*/
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llnode = llist_nodes_reverse(llnode);
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while (llnode) {
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estatus_node = llist_entry(llnode, struct ghes_estatus_node,
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llnode);
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estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
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len = apei_estatus_len(estatus);
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node_len = GHES_ESTATUS_NODE_LEN(len);
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generic = estatus_node->generic;
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ghes_print_estatus(NULL, generic, estatus);
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llnode = llnode->next;
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}
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}
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static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
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{
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struct ghes *ghes, *ghes_global = NULL;
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@ -804,6 +838,7 @@ static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
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if (sev_global >= GHES_SEV_PANIC) {
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oops_begin();
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ghes_print_queued_estatus();
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__ghes_print_estatus(KERN_EMERG, ghes_global->generic,
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ghes_global->estatus);
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/* reboot to log the error! */
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