acpiphp: add support for ioapic hot-remove

This patch adds support for ioapics hot-remove.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: MUNEDA Takahiro <muneda.takahiro@jp.fujitsu.com>
Signed-off-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 92 insertions, 14 deletions

diff --git a/drivers/pci/hotplug/acpiphp.h b/drivers/pci/hotplug/acpiphp.h
index be104eced34..7fff07e877c 100644
--- a/drivers/pci/hotplug/acpiphp.h
+++ b/drivers/pci/hotplug/acpiphp.h
@@ -150,6 +150,11 @@ struct acpiphp_attention_info
         struct module *owner;
 };
 
+struct acpiphp_ioapic {
+        struct pci_dev *dev;
+        u32 gsi_base;
+        struct list_head list;
+};
 
 /* PCI bus bridge HID */
 #define ACPI_PCI_HOST_HID               "PNP0A03"
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 712f02fb1cb..83e8e4412de 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -53,6 +53,8 @@
 #include "acpiphp.h"
 
 static LIST_HEAD(bridge_list);
+static LIST_HEAD(ioapic_list);
+static DEFINE_SPINLOCK(ioapic_list_lock);
 
 #define MY_NAME "acpiphp_glue"
 
@@ -797,6 +799,7 @@ ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
         struct pci_dev *pdev;
         u32 gsi_base;
         u64 phys_addr;
+        struct acpiphp_ioapic *ioapic;
 
         /* Evaluate _STA if present */
         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
@@ -811,30 +814,87 @@ ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
         if (get_gsi_base(handle, &gsi_base))
                 return AE_OK;
 
+        ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL);
+        if (!ioapic)
+                return AE_NO_MEMORY;
+
         pdev = get_apic_pci_info(handle);
         if (!pdev)
-                return AE_OK;
+                goto exit_kfree;
 
-        if (pci_enable_device(pdev)) {
-                pci_dev_put(pdev);
-                return AE_OK;
-        }
+        if (pci_enable_device(pdev))
+                goto exit_pci_dev_put;
 
         pci_set_master(pdev);
 
-        if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)")) {
-                pci_disable_device(pdev);
-                pci_dev_put(pdev);
-                return AE_OK;
-        }
+        if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)"))
+                goto exit_pci_disable_device;
 
         phys_addr = pci_resource_start(pdev, 0);
-        if (acpi_register_ioapic(handle, phys_addr, gsi_base)) {
-                pci_release_region(pdev, 0);
-                pci_disable_device(pdev);
-                pci_dev_put(pdev);
+        if (acpi_register_ioapic(handle, phys_addr, gsi_base))
+                goto exit_pci_release_region;
+
+        ioapic->gsi_base = gsi_base;
+        ioapic->dev = pdev;
+        spin_lock(&ioapic_list_lock);
+        list_add_tail(&ioapic->list, &ioapic_list);
+        spin_unlock(&ioapic_list_lock);
+
+        return AE_OK;
+
+ exit_pci_release_region:
+        pci_release_region(pdev, 0);
+ exit_pci_disable_device:
+        pci_disable_device(pdev);
+ exit_pci_dev_put:
+        pci_dev_put(pdev);
+ exit_kfree:
+        kfree(ioapic);
+
+        return AE_OK;
+}
+
+static acpi_status
+ioapic_remove(acpi_handle handle, u32 lvl, void *context, void **rv)
+{
+        acpi_status status;
+        unsigned long sta;
+        acpi_handle tmp;
+        u32 gsi_base;
+        struct acpiphp_ioapic *pos, *n, *ioapic = NULL;
+
+        /* Evaluate _STA if present */
+        status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
+        if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
+                return AE_CTRL_DEPTH;
+
+        /* Scan only PCI bus scope */
+        status = acpi_get_handle(handle, "_HID", &tmp);
+        if (ACPI_SUCCESS(status))
+                return AE_CTRL_DEPTH;
+
+        if (get_gsi_base(handle, &gsi_base))
                 return AE_OK;
+
+        acpi_unregister_ioapic(handle, gsi_base);
+
+        spin_lock(&ioapic_list_lock);
+        list_for_each_entry_safe(pos, n, &ioapic_list, list) {
+                if (pos->gsi_base != gsi_base)
+                        continue;
+                ioapic = pos;
+                list_del(&ioapic->list);
+                break;
         }
+        spin_unlock(&ioapic_list_lock);
+
+        if (!ioapic)
+                return AE_OK;
+
+        pci_release_region(ioapic->dev, 0);
+        pci_disable_device(ioapic->dev);
+        pci_dev_put(ioapic->dev);
+        kfree(ioapic);
 
         return AE_OK;
 }
@@ -847,6 +907,14 @@ static int acpiphp_configure_ioapics(acpi_handle handle)
         return 0;
 }
 
+static int acpiphp_unconfigure_ioapics(acpi_handle handle)
+{
+        ioapic_remove(handle, 0, NULL, NULL);
+        acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
+                            ACPI_UINT32_MAX, ioapic_remove, NULL, NULL);
+        return 0;
+}
+
 static int power_on_slot(struct acpiphp_slot *slot)
 {
         acpi_status status;
@@ -1146,7 +1214,12 @@ static int disable_device(struct acpiphp_slot *slot)
                                 pci_disable_device(func->pci_dev);
                         }
                 }
+        }
+
+        list_for_each (l, &slot->funcs) {
+                func = list_entry(l, struct acpiphp_func, sibling);
 
+                acpiphp_unconfigure_ioapics(func->handle);
                 acpiphp_bus_trim(func->handle);
                 /* try to remove anyway.
                  * acpiphp_bus_add might have been failed */