powerpc/eeh: Set attention indicator while recovering

I am the RAS team. Hear me roar.

Roar.

On a more serious note, being able to locate failed devices can be helpful.
Set the attention indicator if the slot supports it once we've determined
the device is present and only clear it if the device is fully recovered.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190903101605.2890-12-oohall@gmail.com

arch/powerpc/kernel/eeh_driver.c

@@ -803,13 +803,39 @@ static bool eeh_slot_presence_check(struct pci_dev *pdev)
 	if (!ops || !ops->get_adapter_status)
 		return true;
 
+	/* set the attention indicator while we've got the slot ops */
+	if (ops->set_attention_status)
+		ops->set_attention_status(slot->hotplug, 1);
+
 	rc = ops->get_adapter_status(slot->hotplug, &state);
 	if (rc)
 		return true;
 
 	return !!state;
 }
 
+static void eeh_clear_slot_attention(struct pci_dev *pdev)
+{
+	const struct hotplug_slot_ops *ops;
+	struct pci_slot *slot;
+
+	if (!pdev)
+		return;
+
+	if (pdev->error_state == pci_channel_io_perm_failure)
+		return;
+
+	slot = pdev->slot;
+	if (!slot || !slot->hotplug)
+		return;
+
+	ops = slot->hotplug->ops;
+	if (!ops || !ops->set_attention_status)
+		return;
+
+	ops->set_attention_status(slot->hotplug, 0);
+}
+
 /**
  * eeh_handle_normal_event - Handle EEH events on a specific PE
  * @pe: EEH PE - which should not be used after we return, as it may
@@ -1098,6 +1124,12 @@ void eeh_handle_normal_event(struct eeh_pe *pe)
 	 * we don't want to modify the PE tree structure so we do it here.
 	 */
 	eeh_pe_cleanup(pe);
+
+	/* clear the slot attention LED for all recovered devices */
+	eeh_for_each_pe(pe, tmp_pe)
+		eeh_pe_for_each_dev(tmp_pe, edev, tmp)
+			eeh_clear_slot_attention(edev->pdev);
+
 	eeh_pe_state_clear(pe, EEH_PE_RECOVERING, true);
 }