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x86/ioapic: Split IOAPIC hot-removal into two steps

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The hot removal of IOAPIC is handling PCI and ACPI removal in one go. That
only works when the PCI drivers released the interrupt resources, but
breaks when a IOAPIC interrupt is still associated to a PCI device.

The new pcibios_release_device() callback allows to solve that problem by
splitting the removal into two steps:

1) PCI removal:

   Release all PCI resources including eventually not yet released IOAPIC
   interrupts via the new pcibios_release_device() callback.

2) ACPI removal:

   After release of all PCI resources the ACPI resources can be released
   without issue.

[ tglx: Rewrote changelog ]

Signed-off-by: Rui Wang <rui.y.wang@intel.com>
Cc: tony.luck@intel.com
Cc: linux-pci@vger.kernel.org
Cc: rjw@rjwysocki.net
Cc: linux-acpi@vger.kernel.org
Cc: fengguang.wu@intel.com
Cc: helgaas@kernel.org
Cc: kbuild-all@01.org
Cc: bhelgaas@google.com
Link: http://lkml.kernel.org/r/1488288869-31290-3-git-send-email-rui.y.wang@intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Rui Wang 2017-02-28 21:34:29 +08:00 committed by Thomas Gleixner
parent 153654dbe5
commit f2ae5da726
3 changed files with 21 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/acpi/internal.h
View File

@ -41,8 +41,10 @@ void acpi_gpe_apply_masked_gpes(void);
void acpi_container_init(void);
void acpi_memory_hotplug_init(void);
#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
void pci_ioapic_remove(struct acpi_pci_root *root);
int acpi_ioapic_remove(struct acpi_pci_root *root);
#else
static inline void pci_ioapic_remove(struct acpi_pci_root *root) { return; }
static inline int acpi_ioapic_remove(struct acpi_pci_root *root) { return 0; }
#endif
#ifdef CONFIG_ACPI_DOCK

24
drivers/acpi/ioapic.c
View File

@ -206,6 +206,23 @@ int acpi_ioapic_add(acpi_handle root_handle)
return ACPI_SUCCESS(status) && ACPI_SUCCESS(retval) ? 0 : -ENODEV;
}
void pci_ioapic_remove(struct acpi_pci_root *root)
{
struct acpi_pci_ioapic *ioapic, *tmp;
mutex_lock(&ioapic_list_lock);
list_for_each_entry_safe(ioapic, tmp, &ioapic_list, list) {
if (root->device->handle != ioapic->root_handle)
continue;
if (ioapic->pdev) {
pci_release_region(ioapic->pdev, 0);
pci_disable_device(ioapic->pdev);
pci_dev_put(ioapic->pdev);
}
}
mutex_unlock(&ioapic_list_lock);
}
int acpi_ioapic_remove(struct acpi_pci_root *root)
{
int retval = 0;
@ -215,15 +232,8 @@ int acpi_ioapic_remove(struct acpi_pci_root *root)
list_for_each_entry_safe(ioapic, tmp, &ioapic_list, list) {
if (root->device->handle != ioapic->root_handle)
continue;
if (acpi_unregister_ioapic(ioapic->handle, ioapic->gsi_base))
retval = -EBUSY;
if (ioapic->pdev) {
pci_release_region(ioapic->pdev, 0);
pci_disable_device(ioapic->pdev);
pci_dev_put(ioapic->pdev);
}
if (ioapic->res.flags && ioapic->res.parent)
release_resource(&ioapic->res);
list_del(&ioapic->list);

4
drivers/acpi/pci_root.c
View File

@ -648,12 +648,12 @@ static void acpi_pci_root_remove(struct acpi_device *device)
pci_stop_root_bus(root->bus);
WARN_ON(acpi_ioapic_remove(root));
pci_ioapic_remove(root);
device_set_run_wake(root->bus->bridge, false);
pci_acpi_remove_bus_pm_notifier(device);
pci_remove_root_bus(root->bus);
WARN_ON(acpi_ioapic_remove(root));
dmar_device_remove(device->handle);