arch/powerpc/platforms/powernv/opal-memory-errors.c

Source file repositories/reference/linux-study-clean/arch/powerpc/platforms/powernv/opal-memory-errors.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/platforms/powernv/opal-memory-errors.c
Extension
.c
Size
3384 bytes
Lines
135
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct OpalMsgNode {
	struct list_head list;
	struct opal_msg msg;
};

static void handle_memory_error_event(struct OpalMemoryErrorData *merr_evt)
{
	uint64_t paddr_start, paddr_end;

	pr_debug("%s: Retrieved memory error event, type: 0x%x\n",
		  __func__, merr_evt->type);
	switch (merr_evt->type) {
	case OPAL_MEM_ERR_TYPE_RESILIENCE:
		paddr_start = be64_to_cpu(merr_evt->u.resilience.physical_address_start);
		paddr_end = be64_to_cpu(merr_evt->u.resilience.physical_address_end);
		break;
	case OPAL_MEM_ERR_TYPE_DYN_DALLOC:
		paddr_start = be64_to_cpu(merr_evt->u.dyn_dealloc.physical_address_start);
		paddr_end = be64_to_cpu(merr_evt->u.dyn_dealloc.physical_address_end);
		break;
	default:
		return;
	}

	for (; paddr_start < paddr_end; paddr_start += PAGE_SIZE) {
		memory_failure(paddr_start >> PAGE_SHIFT, 0);
	}
}

static void handle_memory_error(void)
{
	unsigned long flags;
	struct OpalMemoryErrorData *merr_evt;
	struct OpalMsgNode *msg_node;

	spin_lock_irqsave(&opal_mem_err_lock, flags);
	while (!list_empty(&opal_memory_err_list)) {
		 msg_node = list_entry(opal_memory_err_list.next,
					   struct OpalMsgNode, list);
		list_del(&msg_node->list);
		spin_unlock_irqrestore(&opal_mem_err_lock, flags);

		merr_evt = (struct OpalMemoryErrorData *)
					&msg_node->msg.params[0];
		handle_memory_error_event(merr_evt);
		kfree(msg_node);
		spin_lock_irqsave(&opal_mem_err_lock, flags);
	}
	spin_unlock_irqrestore(&opal_mem_err_lock, flags);
}

static void mem_error_handler(struct work_struct *work)
{
	handle_memory_error();
}

static DECLARE_WORK(mem_error_work, mem_error_handler);

/*
 * opal_memory_err_event - notifier handler that queues up the opal message
 * to be processed later.
 */
static int opal_memory_err_event(struct notifier_block *nb,
			  unsigned long msg_type, void *msg)
{
	unsigned long flags;
	struct OpalMsgNode *msg_node;

	if (msg_type != OPAL_MSG_MEM_ERR)
		return 0;

	msg_node = kzalloc_obj(*msg_node, GFP_ATOMIC);
	if (!msg_node) {
		pr_err("MEMORY_ERROR: out of memory, Opal message event not"
		       "handled\n");
		return -ENOMEM;
	}
	memcpy(&msg_node->msg, msg, sizeof(msg_node->msg));

	spin_lock_irqsave(&opal_mem_err_lock, flags);
	list_add(&msg_node->list, &opal_memory_err_list);
	spin_unlock_irqrestore(&opal_mem_err_lock, flags);

	schedule_work(&mem_error_work);
	return 0;
}

static struct notifier_block opal_mem_err_nb = {
	.notifier_call	= opal_memory_err_event,
	.next		= NULL,

Annotation

Implementation Notes