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[PATCH V2 1/3] x86/ioapic: Support hot-removal of IOAPICs present during boot

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  [PATCH V2 1/3] x86/ioapic: Support hot-removal of IOAPICs present during boot Rui Wang <rui.y.wang@intel.com> - 2016-06-08 09:20 +0200
    Re: [PATCH V2 1/3] x86/ioapic: Support hot-removal of IOAPICs  present during boot kbuild test robot <lkp@intel.com> - 2016-06-08 10:10 +0200
    [PATCH V3 1/3] x86/ioapic: Support hot-removal of IOAPICs present during boot Rui Wang <rui.y.wang@intel.com> - 2016-06-08 11:50 +0200
      Re: [PATCH V3 1/3] x86/ioapic: Support hot-removal of IOAPICs present  during boot Thomas Gleixner <tglx@linutronix.de> - 2016-06-10 15:10 +0200
        Re: [PATCH V3 1/3] x86/ioapic: Support hot-removal of IOAPICs present during boot "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-06-10 16:00 +0200
      Re: [PATCH V3 1/3] x86/ioapic: Support hot-removal of IOAPICs  present during boot Bjorn Helgaas <helgaas@kernel.org> - 2016-06-10 18:50 +0200

#1416951 — [PATCH V2 1/3] x86/ioapic: Support hot-removal of IOAPICs present during boot

IOAPICs present during system boot aren't added to ioapic_list,
thus are unable to be hot-removed. Fix it by calling
acpi_ioapic_add() during root bus enumeration.

Signed-off-by: Rui Wang <rui.y.wang@intel.com>
---
 drivers/acpi/internal.h | 2 --
 drivers/acpi/ioapic.c   | 7 ++++---
 drivers/acpi/pci_root.c | 2 +-
 drivers/pci/setup-bus.c | 5 ++++-
 include/linux/acpi.h    | 3 +++
 5 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 9bb0773..bb567a7 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -40,10 +40,8 @@ int acpi_sysfs_init(void);
 void acpi_container_init(void);
 void acpi_memory_hotplug_init(void);
 #ifdef	CONFIG_ACPI_HOTPLUG_IOAPIC
-int acpi_ioapic_add(struct acpi_pci_root *root);
 int acpi_ioapic_remove(struct acpi_pci_root *root);
 #else
-static inline int acpi_ioapic_add(struct acpi_pci_root *root) { return 0; }
 static inline int acpi_ioapic_remove(struct acpi_pci_root *root) { return 0; }
 #endif
 #ifdef CONFIG_ACPI_DOCK
diff --git a/drivers/acpi/ioapic.c b/drivers/acpi/ioapic.c
index ccdc8db..0f272e2 100644
--- a/drivers/acpi/ioapic.c
+++ b/drivers/acpi/ioapic.c
@@ -189,16 +189,17 @@ exit:
 	return AE_OK;
 }
 
-int acpi_ioapic_add(struct acpi_pci_root *root)
+int acpi_ioapic_add(acpi_handle root_handle)
 {
 	acpi_status status, retval = AE_OK;
 
-	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, root->device->handle,
+	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, root_handle,
 				     UINT_MAX, handle_ioapic_add, NULL,
-				     root->device->handle, (void **)&retval);
+				     root_handle, (void **)&retval);
 
 	return ACPI_SUCCESS(status) && ACPI_SUCCESS(retval) ? 0 : -ENODEV;
 }
+EXPORT_SYMBOL_GPL(acpi_ioapic_add);
 
 int acpi_ioapic_remove(struct acpi_pci_root *root)
 {
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index ae3fe4e..53f5965 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -614,7 +614,7 @@ static int acpi_pci_root_add(struct acpi_device *device,
 	if (hotadd) {
 		pcibios_resource_survey_bus(root->bus);
 		pci_assign_unassigned_root_bus_resources(root->bus);
-		acpi_ioapic_add(root);
+		acpi_ioapic_add(root->device->handle);
 	}
 
 	pci_lock_rescan_remove();
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 55641a3..e32c356 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -25,6 +25,7 @@
 #include <linux/ioport.h>
 #include <linux/cache.h>
 #include <linux/slab.h>
+#include <linux/acpi.h>
 #include "pci.h"
 
 unsigned int pci_flags;
@@ -1779,8 +1780,10 @@ void __init pci_assign_unassigned_resources(void)
 {
 	struct pci_bus *root_bus;
 
-	list_for_each_entry(root_bus, &pci_root_buses, node)
+	list_for_each_entry(root_bus, &pci_root_buses, node) {
 		pci_assign_unassigned_root_bus_resources(root_bus);
+		acpi_ioapic_add(ACPI_HANDLE(root_bus->bridge));
+	}
 }
 
 void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 288fac5..3ed22df 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -262,6 +262,9 @@ int acpi_unmap_cpu(int cpu);
 
 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
 int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr);
+int acpi_ioapic_add(acpi_handle root);
+#else
+static inline int acpi_ioapic_add(acpi_handle root) { return 0; }
 #endif
 
 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base);
-- 
1.8.3.1

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#1417014 — Re: [PATCH V2 1/3] x86/ioapic: Support hot-removal of IOAPICs present during boot

[Multipart message — attachments visible in raw view] — view raw

Hi,

[auto build test ERROR on pm/linux-next]
[also build test ERROR on v4.7-rc2 next-20160608]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Rui-Wang/x86-ioapic-Support-hot-removal-of-IOAPICs-present-during-boot/20160608-151907
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
config: mips-txx9 (attached as .config)
compiler: mips-linux-gnu-gcc (Debian 5.3.1-8) 5.3.1 20160205
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=mips 

All errors (new ones prefixed by >>):

   drivers/pci/setup-bus.c: In function 'pci_assign_unassigned_resources':
>> drivers/pci/setup-bus.c:1785:3: error: implicit declaration of function 'acpi_ioapic_add' [-Werror=implicit-function-declaration]
      acpi_ioapic_add(ACPI_HANDLE(root_bus->bridge));
      ^
   cc1: some warnings being treated as errors

vim +/acpi_ioapic_add +1785 drivers/pci/setup-bus.c

  1779	void __init pci_assign_unassigned_resources(void)
  1780	{
  1781		struct pci_bus *root_bus;
  1782	
  1783		list_for_each_entry(root_bus, &pci_root_buses, node) {
  1784			pci_assign_unassigned_root_bus_resources(root_bus);
> 1785			acpi_ioapic_add(ACPI_HANDLE(root_bus->bridge));
  1786		}
  1787	}
  1788	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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#1417192 — [PATCH V3 1/3] x86/ioapic: Support hot-removal of IOAPICs present during boot

v3: Previous versions break mips. This version fixes it.

IOAPICs present during system boot aren't added to ioapic_list,
thus are unable to be hot-removed. Fix it by calling
acpi_ioapic_add() during root bus enumeration.

Signed-off-by: Rui Wang <rui.y.wang@intel.com>
---
 drivers/acpi/internal.h | 2 --
 drivers/acpi/ioapic.c   | 7 ++++---
 drivers/acpi/pci_root.c | 2 +-
 drivers/pci/setup-bus.c | 7 ++++++-
 include/linux/acpi.h    | 3 +++
 5 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 9bb0773..bb567a7 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -40,10 +40,8 @@ int acpi_sysfs_init(void);
 void acpi_container_init(void);
 void acpi_memory_hotplug_init(void);
 #ifdef	CONFIG_ACPI_HOTPLUG_IOAPIC
-int acpi_ioapic_add(struct acpi_pci_root *root);
 int acpi_ioapic_remove(struct acpi_pci_root *root);
 #else
-static inline int acpi_ioapic_add(struct acpi_pci_root *root) { return 0; }
 static inline int acpi_ioapic_remove(struct acpi_pci_root *root) { return 0; }
 #endif
 #ifdef CONFIG_ACPI_DOCK
diff --git a/drivers/acpi/ioapic.c b/drivers/acpi/ioapic.c
index ccdc8db..0f272e2 100644
--- a/drivers/acpi/ioapic.c
+++ b/drivers/acpi/ioapic.c
@@ -189,16 +189,17 @@ exit:
 	return AE_OK;
 }
 
-int acpi_ioapic_add(struct acpi_pci_root *root)
+int acpi_ioapic_add(acpi_handle root_handle)
 {
 	acpi_status status, retval = AE_OK;
 
-	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, root->device->handle,
+	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, root_handle,
 				     UINT_MAX, handle_ioapic_add, NULL,
-				     root->device->handle, (void **)&retval);
+				     root_handle, (void **)&retval);
 
 	return ACPI_SUCCESS(status) && ACPI_SUCCESS(retval) ? 0 : -ENODEV;
 }
+EXPORT_SYMBOL_GPL(acpi_ioapic_add);
 
 int acpi_ioapic_remove(struct acpi_pci_root *root)
 {
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index ae3fe4e..53f5965 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -614,7 +614,7 @@ static int acpi_pci_root_add(struct acpi_device *device,
 	if (hotadd) {
 		pcibios_resource_survey_bus(root->bus);
 		pci_assign_unassigned_root_bus_resources(root->bus);
-		acpi_ioapic_add(root);
+		acpi_ioapic_add(root->device->handle);
 	}
 
 	pci_lock_rescan_remove();
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 55641a3..0658921 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -25,6 +25,7 @@
 #include <linux/ioport.h>
 #include <linux/cache.h>
 #include <linux/slab.h>
+#include <linux/acpi.h>
 #include "pci.h"
 
 unsigned int pci_flags;
@@ -1779,8 +1780,12 @@ void __init pci_assign_unassigned_resources(void)
 {
 	struct pci_bus *root_bus;
 
-	list_for_each_entry(root_bus, &pci_root_buses, node)
+	list_for_each_entry(root_bus, &pci_root_buses, node) {
 		pci_assign_unassigned_root_bus_resources(root_bus);
+#ifdef CONFIG_X86
+		acpi_ioapic_add(ACPI_HANDLE(root_bus->bridge));
+#endif
+	}
 }
 
 void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 288fac5..3ed22df 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -262,6 +262,9 @@ int acpi_unmap_cpu(int cpu);
 
 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
 int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr);
+int acpi_ioapic_add(acpi_handle root);
+#else
+static inline int acpi_ioapic_add(acpi_handle root) { return 0; }
 #endif
 
 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base);
-- 
1.8.3.1

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#1419372 — Re: [PATCH V3 1/3] x86/ioapic: Support hot-removal of IOAPICs present during boot

On Wed, 8 Jun 2016, Rui Wang wrote:

> v3: Previous versions break mips. This version fixes it.
> 
> IOAPICs present during system boot aren't added to ioapic_list,
> thus are unable to be hot-removed. Fix it by calling
> acpi_ioapic_add() during root bus enumeration.

Who will pick that one up? I already took 2/3 of this series as they are
independent.

Thanks,

	tglx

 

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#1419446 — Re: [PATCH V3 1/3] x86/ioapic: Support hot-removal of IOAPICs present during boot

On Friday, June 10, 2016 02:57:52 PM Thomas Gleixner wrote:
> On Wed, 8 Jun 2016, Rui Wang wrote:
> 
> > v3: Previous versions break mips. This version fixes it.
> > 
> > IOAPICs present during system boot aren't added to ioapic_list,
> > thus are unable to be hot-removed. Fix it by calling
> > acpi_ioapic_add() during root bus enumeration.
> 
> Who will pick that one up? I already took 2/3 of this series as they are
> independent.

I can pick it up.

Thanks,
Rafael

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#1419588 — Re: [PATCH V3 1/3] x86/ioapic: Support hot-removal of IOAPICs present during boot

On Wed, Jun 08, 2016 at 05:32:44PM +0800, Rui Wang wrote:
> v3: Previous versions break mips. This version fixes it.
> 
> IOAPICs present during system boot aren't added to ioapic_list,
> thus are unable to be hot-removed. Fix it by calling
> acpi_ioapic_add() during root bus enumeration.
> 
> Signed-off-by: Rui Wang <rui.y.wang@intel.com>
> ---
>  drivers/acpi/internal.h | 2 --
>  drivers/acpi/ioapic.c   | 7 ++++---
>  drivers/acpi/pci_root.c | 2 +-
>  drivers/pci/setup-bus.c | 7 ++++++-
>  include/linux/acpi.h    | 3 +++
>  5 files changed, 14 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
> index 9bb0773..bb567a7 100644
> --- a/drivers/acpi/internal.h
> +++ b/drivers/acpi/internal.h
> @@ -40,10 +40,8 @@ int acpi_sysfs_init(void);
>  void acpi_container_init(void);
>  void acpi_memory_hotplug_init(void);
>  #ifdef	CONFIG_ACPI_HOTPLUG_IOAPIC
> -int acpi_ioapic_add(struct acpi_pci_root *root);
>  int acpi_ioapic_remove(struct acpi_pci_root *root);
>  #else
> -static inline int acpi_ioapic_add(struct acpi_pci_root *root) { return 0; }
>  static inline int acpi_ioapic_remove(struct acpi_pci_root *root) { return 0; }
>  #endif
>  #ifdef CONFIG_ACPI_DOCK
> diff --git a/drivers/acpi/ioapic.c b/drivers/acpi/ioapic.c
> index ccdc8db..0f272e2 100644
> --- a/drivers/acpi/ioapic.c
> +++ b/drivers/acpi/ioapic.c
> @@ -189,16 +189,17 @@ exit:
>  	return AE_OK;
>  }
>  
> -int acpi_ioapic_add(struct acpi_pci_root *root)
> +int acpi_ioapic_add(acpi_handle root_handle)
>  {
>  	acpi_status status, retval = AE_OK;
>  
> -	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, root->device->handle,
> +	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, root_handle,
>  				     UINT_MAX, handle_ioapic_add, NULL,
> -				     root->device->handle, (void **)&retval);
> +				     root_handle, (void **)&retval);
>  
>  	return ACPI_SUCCESS(status) && ACPI_SUCCESS(retval) ? 0 : -ENODEV;
>  }
> +EXPORT_SYMBOL_GPL(acpi_ioapic_add);
>  
>  int acpi_ioapic_remove(struct acpi_pci_root *root)
>  {
> diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
> index ae3fe4e..53f5965 100644
> --- a/drivers/acpi/pci_root.c
> +++ b/drivers/acpi/pci_root.c
> @@ -614,7 +614,7 @@ static int acpi_pci_root_add(struct acpi_device *device,
>  	if (hotadd) {
>  		pcibios_resource_survey_bus(root->bus);
>  		pci_assign_unassigned_root_bus_resources(root->bus);
> -		acpi_ioapic_add(root);
> +		acpi_ioapic_add(root->device->handle);
>  	}
>  
>  	pci_lock_rescan_remove();
> diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
> index 55641a3..0658921 100644
> --- a/drivers/pci/setup-bus.c
> +++ b/drivers/pci/setup-bus.c
> @@ -25,6 +25,7 @@
>  #include <linux/ioport.h>
>  #include <linux/cache.h>
>  #include <linux/slab.h>
> +#include <linux/acpi.h>
>  #include "pci.h"
>  
>  unsigned int pci_flags;
> @@ -1779,8 +1780,12 @@ void __init pci_assign_unassigned_resources(void)
>  {
>  	struct pci_bus *root_bus;
>  
> -	list_for_each_entry(root_bus, &pci_root_buses, node)
> +	list_for_each_entry(root_bus, &pci_root_buses, node) {
>  		pci_assign_unassigned_root_bus_resources(root_bus);
> +#ifdef CONFIG_X86
> +		acpi_ioapic_add(ACPI_HANDLE(root_bus->bridge));
> +#endif

This seems like a strange place to call acpi_ioapic_add().  Your
object is to call acpi_ioapic_add() during root bus enumeration.

I assume we *can't* call acpi_ioapic_add() from acpi_pci_root_add() at
boot time, for some reason you'll explain.  But is there a reason we
have to call it from pci_assign_unassigned_resources() (where it
requires an ifdef) instead of from pcibios_assign_resources(), which
is already x86-specific?

In acpi_pci_root_add(), we have this:

  acpi_pci_root_add(...)
  {
    ...
    if (hotadd)
      acpi_ioapic_add(root);

So the obvious question is why don't we just remove the "if (hotadd)"
and call acpi_ioapic_add() always.

I'm sure the reason is some ordering problem, but we need a comment in
acpi_pci_root_add() about why the obvious solution doesn't work.

> +	}
>  }
>  
>  void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index 288fac5..3ed22df 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -262,6 +262,9 @@ int acpi_unmap_cpu(int cpu);
>  
>  #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
>  int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr);
> +int acpi_ioapic_add(acpi_handle root);
> +#else
> +static inline int acpi_ioapic_add(acpi_handle root) { return 0; }
>  #endif
>  
>  int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base);
> -- 
> 1.8.3.1
> 
> --
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