add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/pci/hotplug/rpaphp_core.c
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@@ -52,7 +52,7 @@
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 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
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 {
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 	int rc;
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-	struct slot *slot = (struct slot *)hotplug_slot->private;
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+	struct slot *slot = to_slot(hotplug_slot);
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 	switch (value) {
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 	case 0:
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@@ -66,7 +66,7 @@
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 	rc = rtas_set_indicator(DR_INDICATOR, slot->index, value);
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 	if (!rc)
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-		hotplug_slot->info->attention_status = value;
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+		slot->attention_status = value;
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 	return rc;
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 }
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@@ -79,7 +79,7 @@
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 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
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 {
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 	int retval, level;
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-	struct slot *slot = (struct slot *)hotplug_slot->private;
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+	struct slot *slot = to_slot(hotplug_slot);
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 	retval = rtas_get_power_level(slot->power_domain, &level);
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 	if (!retval)
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@@ -94,14 +94,14 @@
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  */
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 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
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 {
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-	struct slot *slot = (struct slot *)hotplug_slot->private;
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-	*value = slot->hotplug_slot->info->attention_status;
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+	struct slot *slot = to_slot(hotplug_slot);
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+	*value = slot->attention_status;
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 	return 0;
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 }
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 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
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 {
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-	struct slot *slot = (struct slot *)hotplug_slot->private;
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+	struct slot *slot = to_slot(hotplug_slot);
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 	int rc, state;
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 	rc = rpaphp_get_sensor_state(slot, &state);
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@@ -185,8 +185,8 @@
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 /* Verify the existence of 'drc_name' and/or 'drc_type' within the
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- * current node.  First obtain it's my-drc-index property.  Next,
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- * obtain the DRC info from it's parent.  Use the my-drc-index for
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+ * current node.  First obtain its my-drc-index property.  Next,
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+ * obtain the DRC info from its parent.  Use the my-drc-index for
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  * correlation, and obtain/validate the requested properties.
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  */
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@@ -288,11 +288,10 @@
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 static int is_php_type(char *drc_type)
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 {
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-	unsigned long value;
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 	char *endptr;
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 	/* PCI Hotplug nodes have an integer for drc_type */
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-	value = simple_strtoul(drc_type, &endptr, 10);
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+	simple_strtoul(drc_type, &endptr, 10);
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 	if (endptr == drc_type)
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 		return 0;
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@@ -330,32 +329,54 @@
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 	return 1;
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 }
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331
 
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-/**
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- * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
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- * @dn: device node of slot
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- *
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- * This subroutine will register a hotpluggable slot with the
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- * PCI hotplug infrastructure. This routine is typically called
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- * during boot time, if the hotplug slots are present at boot time,
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- * or is called later, by the dlpar add code, if the slot is
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- * being dynamically added during runtime.
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- *
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- * If the device node points at an embedded (built-in) slot, this
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- * routine will just return without doing anything, since embedded
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- * slots cannot be hotplugged.
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- *
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- * To remove a slot, it suffices to call rpaphp_deregister_slot().
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- */
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-int rpaphp_add_slot(struct device_node *dn)
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+static int rpaphp_drc_info_add_slot(struct device_node *dn)
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+{
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+	struct slot *slot;
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+	struct property *info;
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+	struct of_drc_info drc;
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+	char drc_name[MAX_DRC_NAME_LEN];
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+	const __be32 *cur;
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+	u32 count;
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+	int retval = 0;
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+
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+	info = of_find_property(dn, "ibm,drc-info", NULL);
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+	if (!info)
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+		return 0;
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+
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+	cur = of_prop_next_u32(info, NULL, &count);
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+	if (cur)
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+		cur++;
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+	else
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+		return 0;
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+
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+	of_read_drc_info_cell(&info, &cur, &drc);
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+	if (!is_php_type(drc.drc_type))
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+		return 0;
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+
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+	sprintf(drc_name, "%s%d", drc.drc_name_prefix, drc.drc_name_suffix_start);
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+
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+	slot = alloc_slot_struct(dn, drc.drc_index_start, drc_name, drc.drc_power_domain);
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+	if (!slot)
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+		return -ENOMEM;
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+
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+	slot->type = simple_strtoul(drc.drc_type, NULL, 10);
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+	retval = rpaphp_enable_slot(slot);
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+	if (!retval)
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+		retval = rpaphp_register_slot(slot);
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+
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+	if (retval)
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+		dealloc_slot_struct(slot);
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+
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+	return retval;
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+}
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+
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+static int rpaphp_drc_add_slot(struct device_node *dn)
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 {
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 	struct slot *slot;
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 	int retval = 0;
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 	int i;
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 	const __be32 *indexes, *names, *types, *power_domains;
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 	char *name, *type;
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-
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-	if (!dn->name || strcmp(dn->name, "pci"))
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-		return 0;
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 	/* If this is not a hotplug slot, return without doing anything. */
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 	if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
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@@ -395,6 +416,33 @@
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 	/* XXX FIXME: reports a failure only if last entry in loop failed */
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 	return retval;
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 }
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+
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+/**
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+ * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
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+ * @dn: device node of slot
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+ *
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+ * This subroutine will register a hotpluggable slot with the
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+ * PCI hotplug infrastructure. This routine is typically called
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+ * during boot time, if the hotplug slots are present at boot time,
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+ * or is called later, by the dlpar add code, if the slot is
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+ * being dynamically added during runtime.
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+ *
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+ * If the device node points at an embedded (built-in) slot, this
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+ * routine will just return without doing anything, since embedded
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+ * slots cannot be hotplugged.
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+ *
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+ * To remove a slot, it suffices to call rpaphp_deregister_slot().
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+ */
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+int rpaphp_add_slot(struct device_node *dn)
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+{
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+	if (!of_node_name_eq(dn, "pci"))
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+		return 0;
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+
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+	if (of_find_property(dn, "ibm,drc-info", NULL))
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+		return rpaphp_drc_info_add_slot(dn);
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+	else
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+		return rpaphp_drc_add_slot(dn);
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+}
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 EXPORT_SYMBOL_GPL(rpaphp_add_slot);
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 static void __exit cleanup_slots(void)
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@@ -409,10 +457,9 @@
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 	list_for_each_entry_safe(slot, next, &rpaphp_slot_head,
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 				 rpaphp_slot_list) {
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 		list_del(&slot->rpaphp_slot_list);
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-		pci_hp_deregister(slot->hotplug_slot);
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+		pci_hp_deregister(&slot->hotplug_slot);
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 		dealloc_slot_struct(slot);
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 	}
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-	return;
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 }
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 static int __init rpaphp_init(void)
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@@ -434,7 +481,7 @@
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 static int enable_slot(struct hotplug_slot *hotplug_slot)
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 {
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-	struct slot *slot = (struct slot *)hotplug_slot->private;
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+	struct slot *slot = to_slot(hotplug_slot);
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 	int state;
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 	int retval;
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@@ -446,6 +493,8 @@
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 		return retval;
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 	if (state == PRESENT) {
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+		pseries_eeh_init_edev_recursive(PCI_DN(slot->dn));
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+
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 		pci_lock_rescan_remove();
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 		pci_hp_add_devices(slot->bus);
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 		pci_unlock_rescan_remove();
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@@ -464,7 +513,7 @@
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 static int disable_slot(struct hotplug_slot *hotplug_slot)
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 {
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-	struct slot *slot = (struct slot *)hotplug_slot->private;
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+	struct slot *slot = to_slot(hotplug_slot);
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 	if (slot->state == NOT_CONFIGURED)
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 		return -EINVAL;
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@@ -477,7 +526,7 @@
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 	return 0;
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 }
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-struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
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+const struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
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 	.enable_slot = enable_slot,
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 	.disable_slot = disable_slot,
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 	.set_attention_status = set_attention_status,