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Date: Mon, 21 Jan 2013 13:20:52 -0800
From: Yinghai Lu <yinghai@...nel.org>
To: Bjorn Helgaas <bhelgaas@...gle.com>,
"Rafael J. Wysocki" <rjw@...k.pl>, Len Brown <lenb@...nel.org>,
Taku Izumi <izumi.taku@...fujitsu.com>,
Jiang Liu <jiang.liu@...wei.com>
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-acpi@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH v10 11/11] PCI: Put pci dev to device tree as early as possible
We want to put created pci device in the device tree as soon as possible.
- just after we find it and create pci_dev struct for it.
so for_pci_dev iteration will not miss them.
But at that time, we can not load driver for them yet. Need to be after
pci_assign_unsigned_resources() etc to make sure all pci devices get
resource allocated at first.
Move out device registering out of pci_bus_add_devices, and
new pci_bus_add_devices() will do the device_attach work to load pci drivers
Also remove unattached child bus handling in pci_bus_add_devices().
Because that is not needed, child bus via pci_add_new_bus() is already
in parent bus children list.
-v2: replace pci_bus_add_child() with ->is_added directly according to
Rafael.
Move pci_create_sysfs_dev_files() back in pci_bus_add_dev(), as we
need to wait assign unassigned resources done to create resource
files in /sys.
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
drivers/pci/bus.c | 79 ++++++++-------------------------------------------
drivers/pci/iov.c | 9 +-----
drivers/pci/pci.h | 1 -
drivers/pci/probe.c | 33 ++++++++++++++++-----
4 files changed, 39 insertions(+), 83 deletions(-)
diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 18c1c6d..5665c9a 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -170,69 +170,30 @@ static void pci_bus_attach_device(struct pci_dev *dev)
}
/**
- * pci_bus_add_device - add a single device
+ * pci_bus_add_device - start driver for a single device
* @dev: device to add
*
- * This adds a single pci device to the global
- * device list and adds sysfs and procfs entries
+ * This adds add sysfs entries and start device drivers
*/
int pci_bus_add_device(struct pci_dev *dev)
{
- int retval;
-
- pci_fixup_device(pci_fixup_final, dev);
-
- retval = pcibios_add_device(dev);
- if (retval)
- return retval;
-
- retval = device_add(&dev->dev);
- if (retval)
- return retval;
+ /*
+ * Can not put in pci_device_add yet because pci resources
+ * are not assigned yet for some pci devices.
+ */
+ pci_create_sysfs_dev_files(dev);
pci_bus_attach_device(dev);
dev->is_added = 1;
- pci_proc_attach_device(dev);
- pci_create_sysfs_dev_files(dev);
- return 0;
-}
-
-/**
- * pci_bus_add_child - add a child bus
- * @bus: bus to add
- *
- * This adds sysfs entries for a single bus
- */
-int pci_bus_add_child(struct pci_bus *bus)
-{
- int retval;
-
- if (bus->bridge)
- bus->dev.parent = bus->bridge;
-
- retval = device_register(&bus->dev);
- if (retval)
- return retval;
-
- bus->is_added = 1;
-
- /* Create legacy_io and legacy_mem files for this bus */
- pci_create_legacy_files(bus);
- return retval;
+ return 0;
}
/**
- * pci_bus_add_devices - insert newly discovered PCI devices
+ * pci_bus_add_devices - start driver for PCI devices
* @bus: bus to check for new devices
*
- * Add newly discovered PCI devices (which are on the bus->devices
- * list) to the global PCI device list, add the sysfs and procfs
- * entries. Where a bridge is found, add the discovered bus to
- * the parents list of child buses, and recurse (breadth-first
- * to be compatible with 2.4)
- *
- * Call hotplug for each new devices.
+ * Start driver for PCI devices and add some sysfs entries.
*/
void pci_bus_add_devices(const struct pci_bus *bus)
{
@@ -245,36 +206,20 @@ void pci_bus_add_devices(const struct pci_bus *bus)
if (dev->is_added)
continue;
retval = pci_bus_add_device(dev);
- if (retval)
- dev_err(&dev->dev, "Error adding device, continuing\n");
}
list_for_each_entry(dev, &bus->devices, bus_list) {
BUG_ON(!dev->is_added);
child = dev->subordinate;
- /*
- * If there is an unattached subordinate bus, attach
- * it and then scan for unattached PCI devices.
- */
+
if (!child)
continue;
- if (list_empty(&child->node)) {
- down_write(&pci_bus_sem);
- list_add_tail(&child->node, &dev->bus->children);
- up_write(&pci_bus_sem);
- }
pci_bus_add_devices(child);
- /*
- * register the bus with sysfs as the parent is now
- * properly registered.
- */
if (child->is_added)
continue;
- retval = pci_bus_add_child(child);
- if (retval)
- dev_err(&dev->dev, "Error adding bus, continuing\n");
+ child->is_added = 1;
}
}
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index bafd2bb..f8720af 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -48,12 +48,7 @@ static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr)
return NULL;
pci_bus_insert_busn_res(child, busnr, busnr);
- child->dev.parent = bus->bridge;
- rc = pci_bus_add_child(child);
- if (rc) {
- pci_remove_bus(child);
- return NULL;
- }
+ bus->is_added = 1;
return child;
}
@@ -123,8 +118,6 @@ static int virtfn_add(struct pci_dev *dev, int id, int reset)
virtfn->is_virtfn = 1;
rc = pci_bus_add_device(virtfn);
- if (rc)
- goto failed1;
sprintf(buf, "virtfn%u", id);
rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf);
if (rc)
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index adfd172..d295e7b 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -203,7 +203,6 @@ extern int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
struct resource *res, unsigned int reg);
extern int pci_resource_bar(struct pci_dev *dev, int resno,
enum pci_bar_type *type);
-extern int pci_bus_add_child(struct pci_bus *bus);
extern void pci_enable_ari(struct pci_dev *dev);
/**
* pci_ari_enabled - query ARI forwarding status
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 9588207..30cf9e3 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -623,6 +623,7 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
{
struct pci_bus *child;
int i;
+ int ret;
/*
* Allocate a new bus, and inherit stuff from the parent..
@@ -637,8 +638,7 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
child->bus_flags = parent->bus_flags;
/* initialize some portions of the bus device, but don't register it
- * now as the parent is not properly set up yet. This device will get
- * registered later in pci_bus_add_devices()
+ * now as the parent is not properly set up yet.
*/
child->dev.class = &pcibus_class;
dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr);
@@ -651,11 +651,14 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
child->primary = parent->busn_res.start;
child->busn_res.end = 0xff;
- if (!bridge)
- return child;
+ if (!bridge) {
+ child->dev.parent = parent->bridge;
+ goto add_dev;
+ }
child->self = bridge;
child->bridge = get_device(&bridge->dev);
+ child->dev.parent = child->bridge;
pci_set_bus_of_node(child);
pci_set_bus_speed(child);
@@ -666,6 +669,13 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
}
bridge->subordinate = child;
+add_dev:
+ ret = device_register(&child->dev);
+ WARN_ON(ret < 0);
+
+ /* Create legacy_io and legacy_mem files for this bus */
+ pci_create_legacy_files(child);
+
return child;
}
@@ -1296,6 +1306,8 @@ static void pci_init_capabilities(struct pci_dev *dev)
void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
{
+ int ret;
+
device_initialize(&dev->dev);
dev->dev.release = pci_release_dev;
@@ -1326,6 +1338,15 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
down_write(&pci_bus_sem);
list_add_tail(&dev->bus_list, &bus->devices);
up_write(&pci_bus_sem);
+
+ pci_fixup_device(pci_fixup_final, dev);
+ ret = pcibios_add_device(dev);
+ WARN_ON(ret < 0);
+ /* notifier could use pci capabilities */
+ ret = device_add(&dev->dev);
+ WARN_ON(ret < 0);
+
+ pci_proc_attach_device(dev);
}
struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
@@ -1656,13 +1677,13 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
char bus_addr[64];
char *fmt;
-
b = pci_alloc_bus();
if (!b)
return NULL;
b->sysdata = sysdata;
b->ops = ops;
+ b->number = b->busn_res.start = bus;
b2 = pci_find_bus(pci_domain_nr(b), bus);
if (b2) {
/* If we already got to this bus through a different bridge, ignore it */
@@ -1701,8 +1722,6 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
/* Create legacy_io and legacy_mem files for this bus */
pci_create_legacy_files(b);
- b->number = b->busn_res.start = bus;
-
if (parent)
dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev));
else
--
1.7.10.4
--
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