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Date: Sat, 15 Sep 2012 11:53:23 -0700
From: Yinghai Lu <yinghai@...nel.org>
To: Jiang Liu <liuj97@...il.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>, Len Brown <lenb@...nel.org>,
Tony Luck <tony.luck@...el.com>,
Jiang Liu <jiang.liu@...wei.com>,
Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
Yijing Wang <wangyijing@...wei.com>,
linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 5/9] ACPI/pci-bind: remove bind/unbind callbacks from acpi_device_ops
On Fri, Sep 14, 2012 at 8:05 PM, Jiang Liu <liuj97@...il.com> wrote:
> From: Jiang Liu <jiang.liu@...wei.com>
>
> Now ACPI devices are created before/destroyed after corresponding PCI
> devices, and acpi_platform_notify/acpi_platform_notify_remove will
> update PCI<->ACPI binding relationship when creating/destroying PCI
> devices, there's no need to invoke bind/unbind callbacks from ACPI
> device probe/destroy routines anymore. So remove bind/unbind callbacks
> from acpi_device_ops.
>
> Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
> ---
> drivers/acpi/pci_bind.c | 100 +++++++++----------------------------------
> drivers/acpi/pci_root.c | 9 ----
> drivers/acpi/scan.c | 21 +--------
> include/acpi/acpi_bus.h | 4 --
> include/acpi/acpi_drivers.h | 1 -
> 5 files changed, 23 insertions(+), 112 deletions(-)
>
> diff --git a/drivers/acpi/pci_bind.c b/drivers/acpi/pci_bind.c
> index 320e698..d18316a 100644
> --- a/drivers/acpi/pci_bind.c
> +++ b/drivers/acpi/pci_bind.c
> @@ -35,57 +35,31 @@
> #define _COMPONENT ACPI_PCI_COMPONENT
> ACPI_MODULE_NAME("pci_bind");
>
> -static int acpi_pci_bind_cb(struct acpi_device *device);
> -
> -static int acpi_pci_unbind(struct acpi_device *device, struct pci_dev *dev)
> +static int acpi_pci_unbind(acpi_handle handle, struct pci_dev *dev)
> {
> - device_set_run_wake(&dev->dev, false);
> - pci_acpi_remove_pm_notifier(device);
> + struct acpi_device *acpi_dev;
>
> - if (dev->subordinate) {
> - acpi_pci_irq_del_prt(dev->subordinate);
> - device->ops.bind = NULL;
> - device->ops.unbind = NULL;
> + if (!acpi_bus_get_device(handle, &acpi_dev) && acpi_dev) {
> + device_set_run_wake(&dev->dev, false);
> + pci_acpi_remove_pm_notifier(acpi_dev);
> }
>
> - return 0;
> -}
> -
> -static int acpi_pci_unbind_cb(struct acpi_device *device)
> -{
> - int rc = 0;
> - struct pci_dev *dev;
> -
> - dev = acpi_get_pci_dev(device->handle);
> - if (dev) {
> - rc = acpi_pci_unbind(device, dev);
> - pci_dev_put(dev);
> - }
> + if (dev->subordinate)
> + acpi_pci_irq_del_prt(dev->subordinate);
>
> - return rc;
> + return 0;
> }
>
> -static int acpi_pci_bind(struct acpi_device *device, struct pci_dev *dev)
> +static int acpi_pci_bind(acpi_handle handle, struct pci_dev *dev)
> {
> acpi_status status;
> - acpi_handle handle;
> struct pci_bus *bus;
> + struct acpi_device *acpi_dev;
>
> - pci_acpi_add_pm_notifier(device, dev);
> - if (device->wakeup.flags.run_wake)
> - device_set_run_wake(&dev->dev, true);
> -
> - /*
> - * Install the 'bind' function to facilitate callbacks for
> - * children of the P2P bridge.
> - */
> - if (dev->subordinate) {
> - ACPI_DEBUG_PRINT((ACPI_DB_INFO,
> - "Device %04x:%02x:%02x.%d is a PCI bridge\n",
> - pci_domain_nr(dev->bus), dev->bus->number,
> - PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)));
> - device->ops.bind = acpi_pci_bind_cb;
> - device->ops.unbind = acpi_pci_unbind_cb;
> + if (!acpi_bus_get_device(handle, &acpi_dev) && acpi_dev) {
> + pci_acpi_add_pm_notifier(acpi_dev, dev);
> + if (acpi_dev->wakeup.flags.run_wake)
> + device_set_run_wake(&dev->dev, true);
why not just keep acpi_device *device in function ? so you can avoid
extra acpi_bus_get_device() calling.
> }
>
> /*
> @@ -96,56 +70,24 @@ static int acpi_pci_bind(struct acpi_device *device, struct pci_dev *dev)
> *
> * TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
> */
> - status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
> + status = acpi_get_handle(handle, METHOD_NAME__PRT, &handle);
> if (ACPI_SUCCESS(status)) {
> if (dev->subordinate)
> bus = dev->subordinate;
> else
> bus = dev->bus;
> - acpi_pci_irq_add_prt(device->handle, bus);
> + acpi_pci_irq_add_prt(handle, bus);
> }
if not _PRT, handle will become NULL? better to use &handle_tmp etc.
>
> return 0;
> }
>
> -static int acpi_pci_bind_cb(struct acpi_device *device)
> -{
> - int rc = 0;
> - struct pci_dev *dev;
> -
> - dev = acpi_get_pci_dev(device->handle);
> - if (dev) {
> - rc = acpi_pci_bind(device, dev);
> - pci_dev_put(dev);
> - }
> -
> - return rc;
> -}
> -
> -int acpi_pci_bind_root(struct acpi_device *device)
> -{
> - device->ops.bind = acpi_pci_bind_cb;
> - device->ops.unbind = acpi_pci_unbind_cb;
> -
> - return 0;
> -}
> -
> void acpi_pci_bind_notify(acpi_handle handle, struct device *dev, bool bind)
> {
> - struct acpi_device *acpi_dev;
> -
> - if (!dev_is_pci(dev))
> - return;
> - if (acpi_bus_get_device(handle, &acpi_dev) || !acpi_dev)
> - return;
> -
> - if (acpi_dev->parent) {
> - if (bind) {
> - if (acpi_dev->parent->ops.bind)
> - acpi_pci_bind(acpi_dev, to_pci_dev(dev));
> - } else {
> - if (acpi_dev->parent->ops.unbind)
> - acpi_pci_unbind(acpi_dev, to_pci_dev(dev));
> - }
> + if (dev_is_pci(dev)) {
> + if (bind)
> + acpi_pci_bind(handle, to_pci_dev(dev));
> + else
> + acpi_pci_unbind(handle, to_pci_dev(dev));
> }
> }
> diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
> index 7509034..25d8ad4 100644
> --- a/drivers/acpi/pci_root.c
> +++ b/drivers/acpi/pci_root.c
> @@ -505,15 +505,6 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
> /* TBD: Locking */
> list_add_tail(&root->node, &acpi_pci_roots);
>
> - /*
> - * Attach ACPI-PCI Context
> - * -----------------------
> - * Thus binding the ACPI and PCI devices.
> - */
> - result = acpi_pci_bind_root(device);
> - if (result)
> - goto end;
> -
> printk(KERN_INFO PREFIX "%s [%s] (domain %04x %pR)\n",
> acpi_device_name(device), acpi_device_bid(device),
> root->segment, &root->secondary);
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index d1ecca2..f31cb2f 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -1232,17 +1232,8 @@ static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
> dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
> device_release_driver(&dev->dev);
>
> - if (!rmdevice)
> - return 0;
> -
> - /*
> - * unbind _ADR-Based Devices when hot removal
> - */
> - if (dev->flags.bus_address) {
> - if ((dev->parent) && (dev->parent->ops.unbind))
> - dev->parent->ops.unbind(dev);
> - }
> - acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
> + if (rmdevice)
> + acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
>
> return 0;
> }
> @@ -1319,14 +1310,6 @@ static int acpi_add_single_object(struct acpi_device **child,
>
> result = acpi_device_register(device);
>
> - /*
> - * Bind _ADR-Based Devices when hot add
> - */
> - if (device->flags.bus_address) {
> - if (device->parent && device->parent->ops.bind)
> - device->parent->ops.bind(device);
> - }
> -
> end:
> if (!result) {
> acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
> diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
> index bde976e..ef5babf 100644
> --- a/include/acpi/acpi_bus.h
> +++ b/include/acpi/acpi_bus.h
> @@ -120,8 +120,6 @@ struct acpi_device;
> typedef int (*acpi_op_add) (struct acpi_device * device);
> typedef int (*acpi_op_remove) (struct acpi_device * device, int type);
> typedef int (*acpi_op_start) (struct acpi_device * device);
> -typedef int (*acpi_op_bind) (struct acpi_device * device);
> -typedef int (*acpi_op_unbind) (struct acpi_device * device);
> typedef void (*acpi_op_notify) (struct acpi_device * device, u32 event);
>
> struct acpi_bus_ops {
> @@ -133,8 +131,6 @@ struct acpi_device_ops {
> acpi_op_add add;
> acpi_op_remove remove;
> acpi_op_start start;
> - acpi_op_bind bind;
> - acpi_op_unbind unbind;
> acpi_op_notify notify;
> };
>
> diff --git a/include/acpi/acpi_drivers.h b/include/acpi/acpi_drivers.h
> index bb145e4..fb1c0d5 100644
> --- a/include/acpi/acpi_drivers.h
> +++ b/include/acpi/acpi_drivers.h
> @@ -100,7 +100,6 @@ void acpi_pci_irq_del_prt(struct pci_bus *bus);
> struct pci_bus;
>
> struct pci_dev *acpi_get_pci_dev(acpi_handle);
> -int acpi_pci_bind_root(struct acpi_device *device);
>
> /* Arch-defined function to add a bus to the system */
>
> --
> 1.7.9.5
>
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