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ACPI / hotplug / PCI: Hotplug context objects for bridges and functions

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When either a new hotplug bridge or a new hotplug function is added
by the ACPI-based PCI hotplug (ACPIPHP) code, attach a context object
to its ACPI handle to store hotplug-related information in it.  To
start with, put the handle's bridge and function pointers into that
object.  Count references to the context objects and drop them when
they are not needed any more.

First of all, this makes it possible to find out if the given bridge
has been registered as a function already in a much more
straightforward way and acpiphp_bridge_handle_to_function() can be
dropped (Yay!).

This also will allow some more simplifications to be made going
forward.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Rafael J. Wysocki
2013-07-13 23:27:24 +02:00
parent 2e862c5190
commit cb7b8cedf6
2 changed files with 146 additions and 43 deletions
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10
drivers/pci/hotplug/acpiphp.h
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@@ -49,6 +49,7 @@
#define info(format, arg...) printk(KERN_INFO "%s: " format, MY_NAME , ## arg)
#define warn(format, arg...) printk(KERN_WARNING "%s: " format, MY_NAME , ## arg)
struct acpiphp_context;
struct acpiphp_bridge;
struct acpiphp_slot;
@@ -77,6 +78,7 @@ struct acpiphp_bridge {
struct kref ref;
acpi_handle handle;
struct acpiphp_context *context;
/* Ejectable PCI-to-PCI bridge (PCI bridge and PCI function) */
struct acpiphp_func *func;
@@ -119,6 +121,7 @@ struct acpiphp_slot {
* typically 8 objects per slot (i.e. for each PCI function)
*/
struct acpiphp_func {
struct acpiphp_context *context;
struct acpiphp_slot *slot; /* parent */
struct list_head sibling;
@@ -128,6 +131,13 @@ struct acpiphp_func {
u32 flags; /* see below */
};
struct acpiphp_context {
acpi_handle handle;
struct acpiphp_func *func;
struct acpiphp_bridge *bridge;
unsigned int refcount;
};
/*
* struct acpiphp_attention_info - device specific attention registration
*