[PATCH 01/15] PCI, acpiphp: Separate out hot-add support of pci host bridge

From: Myron Stowe <myron.stowe@redhat.com>
To: bhelgaas@google.com
Cc: linux-pci@vger.kernel.org, yinghai@kernel.org,
	linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 01/15] PCI, acpiphp: Separate out hot-add support of pci host bridge
Date: Thu, 06 Dec 2012 23:25:00 -0700	[thread overview]
Message-ID: <20121207062500.11051.44198.stgit@amt.stowe> (raw)
In-Reply-To: <20121207062454.11051.12739.stgit@amt.stowe>

From: Yinghai Lu <yinghai@kernel.org>

It causes confusion.

We may only need acpi hp for pci host bridge.

Split host bridge hot-add support to pci_root_hp, and keep acpiphp simple.

-v2: put back pci_root_hp change in one patch
-v3: add pcibios_resource_survey_bus() calling
-v4: remove not needed code with remove_bridge
-v5: put back support for acpiphp support for slots just on root bus.
-v6: change some functions to *_p2p_* to make it more clean.
-v7: split hot_added change out.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Myron Stowe <myron.stowe@redhat.com>
---

 drivers/acpi/Makefile              |    1 
 drivers/acpi/pci_root_hp.c         |  228 ++++++++++++++++++++++++++++++++++++
 drivers/pci/hotplug/acpiphp_glue.c |   59 ++-------
 3 files changed, 244 insertions(+), 44 deletions(-)
 create mode 100644 drivers/acpi/pci_root_hp.c

diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 82422fe..4edfe41 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -36,6 +36,7 @@ acpi-y				+= processor_core.o
 acpi-y				+= ec.o
 acpi-$(CONFIG_ACPI_DOCK)	+= dock.o
 acpi-y				+= pci_root.o pci_link.o pci_irq.o pci_bind.o
+acpi-$(CONFIG_HOTPLUG)		+= pci_root_hp.o
 acpi-y				+= power.o
 acpi-y				+= event.o
 acpi-y				+= sysfs.o
diff --git a/drivers/acpi/pci_root_hp.c b/drivers/acpi/pci_root_hp.c
new file mode 100644
index 0000000..10c12aa
--- /dev/null
+++ b/drivers/acpi/pci_root_hp.c
@@ -0,0 +1,228 @@
+/*
+ * Separated from drivers/pci/hotplug/acpiphp_glue.c
+ *	only support root bridge
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/acpi.h>
+
+static LIST_HEAD(acpi_root_bridge_list);
+struct acpi_root_bridge {
+	struct list_head list;
+	acpi_handle handle;
+	u32 flags;
+};
+
+/* bridge flags */
+#define ROOT_BRIDGE_HAS_EJ0	(0x00000002)
+#define ROOT_BRIDGE_HAS_PS3	(0x00000080)
+
+#define ACPI_STA_FUNCTIONING	(0x00000008)
+
+static struct acpi_root_bridge *acpi_root_handle_to_bridge(acpi_handle handle)
+{
+	struct acpi_root_bridge *bridge;
+
+	list_for_each_entry(bridge, &acpi_root_bridge_list, list)
+		if (bridge->handle == handle)
+			return bridge;
+
+	return NULL;
+}
+
+/* allocate and initialize host bridge data structure */
+static void add_acpi_root_bridge(acpi_handle handle)
+{
+	struct acpi_root_bridge *bridge;
+	acpi_handle dummy_handle;
+	acpi_status status;
+
+	/* if the bridge doesn't have _STA, we assume it is always there */
+	status = acpi_get_handle(handle, "_STA", &dummy_handle);
+	if (ACPI_SUCCESS(status)) {
+		unsigned long long tmp;
+
+		status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
+		if (ACPI_FAILURE(status)) {
+			printk(KERN_DEBUG "%s: _STA evaluation failure\n",
+						 __func__);
+			return;
+		}
+		if ((tmp & ACPI_STA_FUNCTIONING) == 0)
+			/* don't register this object */
+			return;
+	}
+
+	bridge = kzalloc(sizeof(struct acpi_root_bridge), GFP_KERNEL);
+	if (!bridge)
+		return;
+
+	bridge->handle = handle;
+
+	if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &dummy_handle)))
+		bridge->flags |= ROOT_BRIDGE_HAS_EJ0;
+	if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &dummy_handle)))
+		bridge->flags |= ROOT_BRIDGE_HAS_PS3;
+
+	list_add(&bridge->list, &acpi_root_bridge_list);
+}
+
+struct acpi_root_hp_work {
+	struct work_struct work;
+	acpi_handle handle;
+	u32 type;
+	void *context;
+};
+
+static void alloc_acpi_root_hp_work(acpi_handle handle, u32 type,
+					void *context,
+					void (*func)(struct work_struct *work))
+{
+	struct acpi_root_hp_work *hp_work;
+	int ret;
+
+	hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL);
+	if (!hp_work)
+		return;
+
+	hp_work->handle = handle;
+	hp_work->type = type;
+	hp_work->context = context;
+
+	INIT_WORK(&hp_work->work, func);
+	ret = queue_work(kacpi_hotplug_wq, &hp_work->work);
+	if (!ret)
+		kfree(hp_work);
+}
+
+static void handle_root_bridge_insertion(acpi_handle handle)
+{
+	struct acpi_device *device, *pdevice;
+	acpi_handle phandle;
+	int ret_val;
+
+	acpi_get_parent(handle, &phandle);
+	if (acpi_bus_get_device(phandle, &pdevice)) {
+		printk(KERN_DEBUG "no parent device, assuming NULL\n");
+		pdevice = NULL;
+	}
+	if (!acpi_bus_get_device(handle, &device)) {
+		/* check if  pci root_bus is removed */
+		struct acpi_pci_root *root = acpi_driver_data(device);
+		if (pci_find_bus(root->segment, root->secondary.start))
+			return;
+
+		printk(KERN_DEBUG "bus exists... trim\n");
+		/* this shouldn't be in here, so remove
+		 * the bus then re-add it...
+		 */
+		ret_val = acpi_bus_trim(device, 1);
+		printk(KERN_DEBUG "acpi_bus_trim return %x\n", ret_val);
+	}
+	if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
+		printk(KERN_ERR "cannot add bridge to acpi list\n");
+		return;
+	}
+	if (acpi_bus_start(device))
+		printk(KERN_ERR "cannot start bridge\n");
+}
+
+static void _handle_hotplug_event_root(struct work_struct *work)
+{
+	struct acpi_root_bridge *bridge;
+	char objname[64];
+	struct acpi_buffer buffer = { .length = sizeof(objname),
+				      .pointer = objname };
+	struct acpi_root_hp_work *hp_work;
+	acpi_handle handle;
+	u32 type;
+
+	hp_work = container_of(work, struct acpi_root_hp_work, work);
+	handle = hp_work->handle;
+	type = hp_work->type;
+
+	bridge = acpi_root_handle_to_bridge(handle);
+
+	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
+
+	switch (type) {
+	case ACPI_NOTIFY_BUS_CHECK:
+		/* bus enumerate */
+		printk(KERN_DEBUG "%s: Bus check notify on %s\n", __func__,
+				 objname);
+		if (!bridge) {
+			handle_root_bridge_insertion(handle);
+			add_acpi_root_bridge(handle);
+		}
+
+		break;
+
+	case ACPI_NOTIFY_DEVICE_CHECK:
+		/* device check */
+		printk(KERN_DEBUG "%s: Device check notify on %s\n", __func__,
+				 objname);
+		if (!bridge) {
+			handle_root_bridge_insertion(handle);
+			add_acpi_root_bridge(handle);
+		}
+		break;
+
+	default:
+		printk(KERN_WARNING "notify_handler: unknown event type 0x%x for %s\n",
+				 type, objname);
+		break;
+	}
+
+	kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
+}
+
+static void handle_hotplug_event_root(acpi_handle handle, u32 type,
+					void *context)
+{
+	alloc_acpi_root_hp_work(handle, type, context,
+				_handle_hotplug_event_root);
+}
+
+static acpi_status __init
+find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
+{
+	char objname[64];
+	struct acpi_buffer buffer = { .length = sizeof(objname),
+				      .pointer = objname };
+	int *count = (int *)context;
+
+	if (!acpi_is_root_bridge(handle))
+		return AE_OK;
+
+	(*count)++;
+
+	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
+
+	acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+				handle_hotplug_event_root, NULL);
+	printk(KERN_DEBUG "acpi root: %s notify handler installed\n", objname);
+
+	add_acpi_root_bridge(handle);
+
+	return AE_OK;
+}
+
+static int __init acpi_pci_root_hp_init(void)
+{
+	int num = 0;
+
+	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
+		ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL);
+
+	printk(KERN_DEBUG "Found %d acpi root devices\n", num);
+
+	return 0;
+}
+
+subsys_initcall(acpi_pci_root_hp_init);
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 3d6d4fd..d0369dc 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -543,10 +543,13 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge)
 	acpi_status status;
 	acpi_handle handle = bridge->handle;
 
-	status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+	if (bridge->type != BRIDGE_TYPE_HOST) {
+		status = acpi_remove_notify_handler(handle,
+					    ACPI_SYSTEM_NOTIFY,
 					    handle_hotplug_event_bridge);
-	if (ACPI_FAILURE(status))
-		err("failed to remove notify handler\n");
+		if (ACPI_FAILURE(status))
+			err("failed to remove notify handler\n");
+	}
 
 	if ((bridge->type != BRIDGE_TYPE_HOST) &&
 	    ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
@@ -630,9 +633,6 @@ static void remove_bridge(struct acpi_pci_root *root)
 	bridge = acpiphp_handle_to_bridge(handle);
 	if (bridge)
 		cleanup_bridge(bridge);
-	else
-		acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
-					   handle_hotplug_event_bridge);
 }
 
 static int power_on_slot(struct acpiphp_slot *slot)
@@ -1107,18 +1107,12 @@ static void acpiphp_sanitize_bus(struct pci_bus *bus)
 }
 
 /* Program resources in newly inserted bridge */
-static int acpiphp_configure_bridge (acpi_handle handle)
+static int acpiphp_configure_p2p_bridge(acpi_handle handle)
 {
-	struct pci_bus *bus;
+	struct pci_dev *pdev = acpi_get_pci_dev(handle);
+	struct pci_bus *bus = pdev->subordinate;
 
-	if (acpi_is_root_bridge(handle)) {
-		struct acpi_pci_root *root = acpi_pci_find_root(handle);
-		bus = root->bus;
-	} else {
-		struct pci_dev *pdev = acpi_get_pci_dev(handle);
-		bus = pdev->subordinate;
-		pci_dev_put(pdev);
-	}
+	pci_dev_put(pdev);
 
 	pci_bus_size_bridges(bus);
 	pci_bus_assign_resources(bus);
@@ -1128,7 +1122,7 @@ static int acpiphp_configure_bridge (acpi_handle handle)
 	return 0;
 }
 
-static void handle_bridge_insertion(acpi_handle handle, u32 type)
+static void handle_p2p_bridge_insertion(acpi_handle handle, u32 type)
 {
 	struct acpi_device *device, *pdevice;
 	acpi_handle phandle;
@@ -1148,9 +1142,9 @@ static void handle_bridge_insertion(acpi_handle handle, u32 type)
 		err("cannot add bridge to acpi list\n");
 		return;
 	}
-	if (!acpiphp_configure_bridge(handle) &&
+	if (!acpiphp_configure_p2p_bridge(handle) &&
 		!acpi_bus_start(device))
-		add_bridge(handle);
+		add_p2p_bridge(handle);
 	else
 		err("cannot configure and start bridge\n");
 
@@ -1236,7 +1230,7 @@ static void _handle_hotplug_event_bridge(struct work_struct *work)
 
 	if (acpi_bus_get_device(handle, &device)) {
 		/* This bridge must have just been physically inserted */
-		handle_bridge_insertion(handle, type);
+		handle_p2p_bridge_insertion(handle, type);
 		goto out;
 	}
 
@@ -1413,21 +1407,6 @@ static void handle_hotplug_event_func(acpi_handle handle, u32 type,
 			      _handle_hotplug_event_func);
 }
 
-static acpi_status
-find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
-{
-	int *count = (int *)context;
-
-	if (!acpi_is_root_bridge(handle))
-		return AE_OK;
-
-	(*count)++;
-	acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
-				    handle_hotplug_event_bridge, NULL);
-
-	return AE_OK ;
-}
-
 static struct acpi_pci_driver acpi_pci_hp_driver = {
 	.add =		add_bridge,
 	.remove =	remove_bridge,
@@ -1438,15 +1417,7 @@ static struct acpi_pci_driver acpi_pci_hp_driver = {
  */
 int __init acpiphp_glue_init(void)
 {
-	int num = 0;
-
-	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
-			ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL);
-
-	if (num <= 0)
-		return -1;
-	else
-		acpi_pci_register_driver(&acpi_pci_hp_driver);
+	acpi_pci_register_driver(&acpi_pci_hp_driver);
 
 	return 0;
 }
