* [PATCH] ACPI / PCI: Initialize PCI root drivers after PCI bus enumeration
@ 2013-02-13 0:16 Rafael J. Wysocki
2013-02-13 1:54 ` Yinghai Lu
0 siblings, 1 reply; 4+ messages in thread
From: Rafael J. Wysocki @ 2013-02-13 0:16 UTC (permalink / raw)
To: ACPI Devel Maling List
Cc: Bjorn Helgaas, LKML, Jiang Liu, Yinghai Lu, Toshi Kani,
Yasuaki Ishimatsu, Myron Stowe, linux-pci
From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
After commit 1aeae82 (ACPI / PCI: avoid building pci_slot as module)
the pci_slot driver's .add() callback routine, acpi_pci_slot_add(),
is executed from within acpi_pci_root_add() before the PCI devices on
the bus are enumerated and that triggers the WARN_ON() in
kobject_get():
WARNING: at /scratch/rafael/work/test/include/linux/kref.h:42 kobject_get+0x33/0x40()
Hardware name: PORTEGE R500
Modules linked in:
Pid: 1, comm: swapper/0 Not tainted 3.8.0-rc7+ #160
Call Trace:
[<ffffffff8103d38a>] warn_slowpath_common+0x7a/0xb0
[<ffffffff8103d3d5>] warn_slowpath_null+0x15/0x20
[<ffffffff812f99b3>] kobject_get+0x33/0x40
[<ffffffff81452b82>] get_device+0x12/0x30
[<ffffffff8138df7b>] register_slot+0x243/0x295
[<ffffffff810a7b6d>] ? trace_hardirqs_on+0xd/0x10
[<ffffffff8137b7b9>] acpi_ns_walk_namespace+0x10f/0x24a
[<ffffffff8138dd38>] ? walk_p2p_bridge+0x13b/0x13b
[<ffffffff8138dd38>] ? walk_p2p_bridge+0x13b/0x13b
[<ffffffff8137bdc3>] acpi_walk_namespace+0xe9/0x132
[<ffffffff8138dd38>] ? walk_p2p_bridge+0x13b/0x13b
[<ffffffff8138dcf5>] walk_p2p_bridge+0xf8/0x13b
[<ffffffff8134d606>] ? acpi_os_signal_semaphore+0x76/0x87
[<ffffffff8138dd38>] ? walk_p2p_bridge+0x13b/0x13b
[<ffffffff8137b7b9>] acpi_ns_walk_namespace+0x10f/0x24a
[<ffffffff8138dbfd>] ? do_sta_before_sun+0x2b/0x2b
[<ffffffff8138dbfd>] ? do_sta_before_sun+0x2b/0x2b
[<ffffffff8137bdc3>] acpi_walk_namespace+0xe9/0x132
[<ffffffff81356071>] ? acpi_pci_root_add+0x3e7/0x49a
[<ffffffff8138e07f>] acpi_pci_slot_add+0xb2/0x103
[<ffffffff8138dd38>] ? walk_p2p_bridge+0x13b/0x13b
[<ffffffff81356089>] acpi_pci_root_add+0x3ff/0x49a
which means that pci_bus->dev used in register_slot() has not been
registered yet at that point.
To fix this use the observation that before commit 1aeae82
acpi_pci_slot_add() was always run after pci_bus_add_devices()
and that happened to the acpiphp's .add() callback routine too.
Thus it is safe to reorder acpi_pci_root_add() to make the PCI root
drivers' .add() callbacks be run after pci_bus_add_devices(), so do
that.
This approach was previously proposed by Myron Stowe.
References: https://patchwork.kernel.org/patch/1848781/
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
The commit mentioned in the changelog above is in linux-pm.git/linux-next.
Thanks,
Rafael
---
drivers/acpi/pci_root.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
Index: test/drivers/acpi/pci_root.c
===================================================================
--- test.orig/drivers/acpi/pci_root.c
+++ test/drivers/acpi/pci_root.c
@@ -600,17 +600,20 @@ static int acpi_pci_root_add(struct acpi
if (system_state != SYSTEM_BOOTING)
pci_assign_unassigned_bus_resources(root->bus);
+ /* need to after hot-added ioapic is registered */
+ if (system_state != SYSTEM_BOOTING)
+ pci_enable_bridges(root->bus);
+
+ pci_bus_add_devices(root->bus);
+
mutex_lock(&acpi_pci_root_lock);
+
list_for_each_entry(driver, &acpi_pci_drivers, node)
if (driver->add)
driver->add(root);
- mutex_unlock(&acpi_pci_root_lock);
- /* need to after hot-added ioapic is registered */
- if (system_state != SYSTEM_BOOTING)
- pci_enable_bridges(root->bus);
+ mutex_unlock(&acpi_pci_root_lock);
- pci_bus_add_devices(root->bus);
return 1;
out_del_root:
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] ACPI / PCI: Initialize PCI root drivers after PCI bus enumeration
2013-02-13 0:16 [PATCH] ACPI / PCI: Initialize PCI root drivers after PCI bus enumeration Rafael J. Wysocki
@ 2013-02-13 1:54 ` Yinghai Lu
2013-02-13 12:59 ` Rafael J. Wysocki
0 siblings, 1 reply; 4+ messages in thread
From: Yinghai Lu @ 2013-02-13 1:54 UTC (permalink / raw)
To: Rafael J. Wysocki
Cc: ACPI Devel Maling List, Bjorn Helgaas, LKML, Jiang Liu,
Toshi Kani, Yasuaki Ishimatsu, Myron Stowe, linux-pci
On Tue, Feb 12, 2013 at 4:16 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
>
> After commit 1aeae82 (ACPI / PCI: avoid building pci_slot as module)
> the pci_slot driver's .add() callback routine, acpi_pci_slot_add(),
> is executed from within acpi_pci_root_add() before the PCI devices on
> the bus are enumerated and that triggers the WARN_ON() in
> kobject_get():
>
> WARNING: at /scratch/rafael/work/test/include/linux/kref.h:42 kobject_get+0x33/0x40()
> Hardware name: PORTEGE R500
> Modules linked in:
> Pid: 1, comm: swapper/0 Not tainted 3.8.0-rc7+ #160
> Call Trace:
> [<ffffffff8103d38a>] warn_slowpath_common+0x7a/0xb0
> [<ffffffff8103d3d5>] warn_slowpath_null+0x15/0x20
> [<ffffffff812f99b3>] kobject_get+0x33/0x40
> [<ffffffff81452b82>] get_device+0x12/0x30
> [<ffffffff8138df7b>] register_slot+0x243/0x295
> [<ffffffff810a7b6d>] ? trace_hardirqs_on+0xd/0x10
> [<ffffffff8137b7b9>] acpi_ns_walk_namespace+0x10f/0x24a
> [<ffffffff8138dd38>] ? walk_p2p_bridge+0x13b/0x13b
> [<ffffffff8138dd38>] ? walk_p2p_bridge+0x13b/0x13b
> [<ffffffff8137bdc3>] acpi_walk_namespace+0xe9/0x132
> [<ffffffff8138dd38>] ? walk_p2p_bridge+0x13b/0x13b
> [<ffffffff8138dcf5>] walk_p2p_bridge+0xf8/0x13b
> [<ffffffff8134d606>] ? acpi_os_signal_semaphore+0x76/0x87
> [<ffffffff8138dd38>] ? walk_p2p_bridge+0x13b/0x13b
> [<ffffffff8137b7b9>] acpi_ns_walk_namespace+0x10f/0x24a
> [<ffffffff8138dbfd>] ? do_sta_before_sun+0x2b/0x2b
> [<ffffffff8138dbfd>] ? do_sta_before_sun+0x2b/0x2b
> [<ffffffff8137bdc3>] acpi_walk_namespace+0xe9/0x132
> [<ffffffff81356071>] ? acpi_pci_root_add+0x3e7/0x49a
> [<ffffffff8138e07f>] acpi_pci_slot_add+0xb2/0x103
> [<ffffffff8138dd38>] ? walk_p2p_bridge+0x13b/0x13b
> [<ffffffff81356089>] acpi_pci_root_add+0x3ff/0x49a
>
> which means that pci_bus->dev used in register_slot() has not been
> registered yet at that point.
>
> To fix this use the observation that before commit 1aeae82
> acpi_pci_slot_add() was always run after pci_bus_add_devices()
> and that happened to the acpiphp's .add() callback routine too.
> Thus it is safe to reorder acpi_pci_root_add() to make the PCI root
> drivers' .add() callbacks be run after pci_bus_add_devices(), so do
> that.
>
> This approach was previously proposed by Myron Stowe.
>
> References: https://patchwork.kernel.org/patch/1848781/
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> ---
>
> The commit mentioned in the changelog above is in linux-pm.git/linux-next.
>
> Thanks,
> Rafael
>
> ---
> drivers/acpi/pci_root.c | 13 ++++++++-----
> 1 file changed, 8 insertions(+), 5 deletions(-)
>
> Index: test/drivers/acpi/pci_root.c
> ===================================================================
> --- test.orig/drivers/acpi/pci_root.c
> +++ test/drivers/acpi/pci_root.c
> @@ -600,17 +600,20 @@ static int acpi_pci_root_add(struct acpi
> if (system_state != SYSTEM_BOOTING)
> pci_assign_unassigned_bus_resources(root->bus);
>
> + /* need to after hot-added ioapic is registered */
> + if (system_state != SYSTEM_BOOTING)
> + pci_enable_bridges(root->bus);
> +
> + pci_bus_add_devices(root->bus);
> +
> mutex_lock(&acpi_pci_root_lock);
> +
> list_for_each_entry(driver, &acpi_pci_drivers, node)
> if (driver->add)
> driver->add(root);
> - mutex_unlock(&acpi_pci_root_lock);
>
> - /* need to after hot-added ioapic is registered */
> - if (system_state != SYSTEM_BOOTING)
> - pci_enable_bridges(root->bus);
> + mutex_unlock(&acpi_pci_root_lock);
>
> - pci_bus_add_devices(root->bus);
> return 1;
>
> out_del_root:
>
No, we don't need this after
| commit 4f535093cf8f6da8cfda7c36c2c1ecd2e9586ee4
| PCI: Put pci_dev in device tree as early as possible
in pci/next.
So we can move that Jiang's patch from your tree to Bjorn's tree?
Thanks
Yinghai
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] ACPI / PCI: Initialize PCI root drivers after PCI bus enumeration
2013-02-13 1:54 ` Yinghai Lu
@ 2013-02-13 12:59 ` Rafael J. Wysocki
2013-02-16 1:10 ` Bjorn Helgaas
0 siblings, 1 reply; 4+ messages in thread
From: Rafael J. Wysocki @ 2013-02-13 12:59 UTC (permalink / raw)
To: Yinghai Lu, Bjorn Helgaas
Cc: ACPI Devel Maling List, LKML, Jiang Liu, Toshi Kani,
Yasuaki Ishimatsu, Myron Stowe, linux-pci
On Tuesday, February 12, 2013 05:54:08 PM Yinghai Lu wrote:
> On Tue, Feb 12, 2013 at 4:16 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> >
> > After commit 1aeae82 (ACPI / PCI: avoid building pci_slot as module)
> > the pci_slot driver's .add() callback routine, acpi_pci_slot_add(),
> > is executed from within acpi_pci_root_add() before the PCI devices on
> > the bus are enumerated and that triggers the WARN_ON() in
> > kobject_get():
> >
> > WARNING: at /scratch/rafael/work/test/include/linux/kref.h:42 kobject_get+0x33/0x40()
> > Hardware name: PORTEGE R500
> > Modules linked in:
> > Pid: 1, comm: swapper/0 Not tainted 3.8.0-rc7+ #160
> > Call Trace:
> > [<ffffffff8103d38a>] warn_slowpath_common+0x7a/0xb0
> > [<ffffffff8103d3d5>] warn_slowpath_null+0x15/0x20
> > [<ffffffff812f99b3>] kobject_get+0x33/0x40
> > [<ffffffff81452b82>] get_device+0x12/0x30
> > [<ffffffff8138df7b>] register_slot+0x243/0x295
> > [<ffffffff810a7b6d>] ? trace_hardirqs_on+0xd/0x10
> > [<ffffffff8137b7b9>] acpi_ns_walk_namespace+0x10f/0x24a
> > [<ffffffff8138dd38>] ? walk_p2p_bridge+0x13b/0x13b
> > [<ffffffff8138dd38>] ? walk_p2p_bridge+0x13b/0x13b
> > [<ffffffff8137bdc3>] acpi_walk_namespace+0xe9/0x132
> > [<ffffffff8138dd38>] ? walk_p2p_bridge+0x13b/0x13b
> > [<ffffffff8138dcf5>] walk_p2p_bridge+0xf8/0x13b
> > [<ffffffff8134d606>] ? acpi_os_signal_semaphore+0x76/0x87
> > [<ffffffff8138dd38>] ? walk_p2p_bridge+0x13b/0x13b
> > [<ffffffff8137b7b9>] acpi_ns_walk_namespace+0x10f/0x24a
> > [<ffffffff8138dbfd>] ? do_sta_before_sun+0x2b/0x2b
> > [<ffffffff8138dbfd>] ? do_sta_before_sun+0x2b/0x2b
> > [<ffffffff8137bdc3>] acpi_walk_namespace+0xe9/0x132
> > [<ffffffff81356071>] ? acpi_pci_root_add+0x3e7/0x49a
> > [<ffffffff8138e07f>] acpi_pci_slot_add+0xb2/0x103
> > [<ffffffff8138dd38>] ? walk_p2p_bridge+0x13b/0x13b
> > [<ffffffff81356089>] acpi_pci_root_add+0x3ff/0x49a
> >
> > which means that pci_bus->dev used in register_slot() has not been
> > registered yet at that point.
> >
> > To fix this use the observation that before commit 1aeae82
> > acpi_pci_slot_add() was always run after pci_bus_add_devices()
> > and that happened to the acpiphp's .add() callback routine too.
> > Thus it is safe to reorder acpi_pci_root_add() to make the PCI root
> > drivers' .add() callbacks be run after pci_bus_add_devices(), so do
> > that.
> >
> > This approach was previously proposed by Myron Stowe.
> >
> > References: https://patchwork.kernel.org/patch/1848781/
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> > ---
> >
> > The commit mentioned in the changelog above is in linux-pm.git/linux-next.
> >
> > Thanks,
> > Rafael
> >
> > ---
> > drivers/acpi/pci_root.c | 13 ++++++++-----
> > 1 file changed, 8 insertions(+), 5 deletions(-)
> >
> > Index: test/drivers/acpi/pci_root.c
> > ===================================================================
> > --- test.orig/drivers/acpi/pci_root.c
> > +++ test/drivers/acpi/pci_root.c
> > @@ -600,17 +600,20 @@ static int acpi_pci_root_add(struct acpi
> > if (system_state != SYSTEM_BOOTING)
> > pci_assign_unassigned_bus_resources(root->bus);
> >
> > + /* need to after hot-added ioapic is registered */
> > + if (system_state != SYSTEM_BOOTING)
> > + pci_enable_bridges(root->bus);
> > +
> > + pci_bus_add_devices(root->bus);
> > +
> > mutex_lock(&acpi_pci_root_lock);
> > +
> > list_for_each_entry(driver, &acpi_pci_drivers, node)
> > if (driver->add)
> > driver->add(root);
> > - mutex_unlock(&acpi_pci_root_lock);
> >
> > - /* need to after hot-added ioapic is registered */
> > - if (system_state != SYSTEM_BOOTING)
> > - pci_enable_bridges(root->bus);
> > + mutex_unlock(&acpi_pci_root_lock);
> >
> > - pci_bus_add_devices(root->bus);
> > return 1;
> >
> > out_del_root:
> >
>
> No, we don't need this after
>
> | commit 4f535093cf8f6da8cfda7c36c2c1ecd2e9586ee4
> | PCI: Put pci_dev in device tree as early as possible
>
> in pci/next.
>
> So we can move that Jiang's patch from your tree to Bjorn's tree?
OK, I'm dropping that patch from my tree, then (hopefully, no one has merged
my acpi-cleanup branch yet).
Bjorn, could you pick up https://patchwork.kernel.org/patch/2003771/ please?
Rafael
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] ACPI / PCI: Initialize PCI root drivers after PCI bus enumeration
2013-02-13 12:59 ` Rafael J. Wysocki
@ 2013-02-16 1:10 ` Bjorn Helgaas
0 siblings, 0 replies; 4+ messages in thread
From: Bjorn Helgaas @ 2013-02-16 1:10 UTC (permalink / raw)
To: Rafael J. Wysocki
Cc: Yinghai Lu, ACPI Devel Maling List, LKML, Jiang Liu, Toshi Kani,
Yasuaki Ishimatsu, Myron Stowe, linux-pci
On Wed, Feb 13, 2013 at 5:59 AM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> On Tuesday, February 12, 2013 05:54:08 PM Yinghai Lu wrote:
>> On Tue, Feb 12, 2013 at 4:16 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
>> > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
>> >
>> > After commit 1aeae82 (ACPI / PCI: avoid building pci_slot as module)
>> > the pci_slot driver's .add() callback routine, acpi_pci_slot_add(),
>> > is executed from within acpi_pci_root_add() before the PCI devices on
>> > the bus are enumerated and that triggers the WARN_ON() in
>> > kobject_get():
>> >
>> > WARNING: at /scratch/rafael/work/test/include/linux/kref.h:42 kobject_get+0x33/0x40()
>> > Hardware name: PORTEGE R500
>> > Modules linked in:
>> > Pid: 1, comm: swapper/0 Not tainted 3.8.0-rc7+ #160
>> > Call Trace:
>> > [<ffffffff8103d38a>] warn_slowpath_common+0x7a/0xb0
>> > [<ffffffff8103d3d5>] warn_slowpath_null+0x15/0x20
>> > [<ffffffff812f99b3>] kobject_get+0x33/0x40
>> > [<ffffffff81452b82>] get_device+0x12/0x30
>> > [<ffffffff8138df7b>] register_slot+0x243/0x295
>> > [<ffffffff810a7b6d>] ? trace_hardirqs_on+0xd/0x10
>> > [<ffffffff8137b7b9>] acpi_ns_walk_namespace+0x10f/0x24a
>> > [<ffffffff8138dd38>] ? walk_p2p_bridge+0x13b/0x13b
>> > [<ffffffff8138dd38>] ? walk_p2p_bridge+0x13b/0x13b
>> > [<ffffffff8137bdc3>] acpi_walk_namespace+0xe9/0x132
>> > [<ffffffff8138dd38>] ? walk_p2p_bridge+0x13b/0x13b
>> > [<ffffffff8138dcf5>] walk_p2p_bridge+0xf8/0x13b
>> > [<ffffffff8134d606>] ? acpi_os_signal_semaphore+0x76/0x87
>> > [<ffffffff8138dd38>] ? walk_p2p_bridge+0x13b/0x13b
>> > [<ffffffff8137b7b9>] acpi_ns_walk_namespace+0x10f/0x24a
>> > [<ffffffff8138dbfd>] ? do_sta_before_sun+0x2b/0x2b
>> > [<ffffffff8138dbfd>] ? do_sta_before_sun+0x2b/0x2b
>> > [<ffffffff8137bdc3>] acpi_walk_namespace+0xe9/0x132
>> > [<ffffffff81356071>] ? acpi_pci_root_add+0x3e7/0x49a
>> > [<ffffffff8138e07f>] acpi_pci_slot_add+0xb2/0x103
>> > [<ffffffff8138dd38>] ? walk_p2p_bridge+0x13b/0x13b
>> > [<ffffffff81356089>] acpi_pci_root_add+0x3ff/0x49a
>> >
>> > which means that pci_bus->dev used in register_slot() has not been
>> > registered yet at that point.
>> >
>> > To fix this use the observation that before commit 1aeae82
>> > acpi_pci_slot_add() was always run after pci_bus_add_devices()
>> > and that happened to the acpiphp's .add() callback routine too.
>> > Thus it is safe to reorder acpi_pci_root_add() to make the PCI root
>> > drivers' .add() callbacks be run after pci_bus_add_devices(), so do
>> > that.
>> >
>> > This approach was previously proposed by Myron Stowe.
>> >
>> > References: https://patchwork.kernel.org/patch/1848781/
>> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
>> > ---
>> >
>> > The commit mentioned in the changelog above is in linux-pm.git/linux-next.
>> >
>> > Thanks,
>> > Rafael
>> >
>> > ---
>> > drivers/acpi/pci_root.c | 13 ++++++++-----
>> > 1 file changed, 8 insertions(+), 5 deletions(-)
>> >
>> > Index: test/drivers/acpi/pci_root.c
>> > ===================================================================
>> > --- test.orig/drivers/acpi/pci_root.c
>> > +++ test/drivers/acpi/pci_root.c
>> > @@ -600,17 +600,20 @@ static int acpi_pci_root_add(struct acpi
>> > if (system_state != SYSTEM_BOOTING)
>> > pci_assign_unassigned_bus_resources(root->bus);
>> >
>> > + /* need to after hot-added ioapic is registered */
>> > + if (system_state != SYSTEM_BOOTING)
>> > + pci_enable_bridges(root->bus);
>> > +
>> > + pci_bus_add_devices(root->bus);
>> > +
>> > mutex_lock(&acpi_pci_root_lock);
>> > +
>> > list_for_each_entry(driver, &acpi_pci_drivers, node)
>> > if (driver->add)
>> > driver->add(root);
>> > - mutex_unlock(&acpi_pci_root_lock);
>> >
>> > - /* need to after hot-added ioapic is registered */
>> > - if (system_state != SYSTEM_BOOTING)
>> > - pci_enable_bridges(root->bus);
>> > + mutex_unlock(&acpi_pci_root_lock);
>> >
>> > - pci_bus_add_devices(root->bus);
>> > return 1;
>> >
>> > out_del_root:
>> >
>>
>> No, we don't need this after
>>
>> | commit 4f535093cf8f6da8cfda7c36c2c1ecd2e9586ee4
>> | PCI: Put pci_dev in device tree as early as possible
>>
>> in pci/next.
>>
>> So we can move that Jiang's patch from your tree to Bjorn's tree?
>
> OK, I'm dropping that patch from my tree, then (hopefully, no one has merged
> my acpi-cleanup branch yet).
>
> Bjorn, could you pick up https://patchwork.kernel.org/patch/2003771/ please?
I applied this to my next branch for v3.9:
commit ab1a2e038ff2336502e95ec6492c0364a9fc70d0
Author: Jiang Liu <liuj97@gmail.com>
Date: Sat Jan 19 00:07:42 2013 +0800
ACPI / PCI: Make pci_slot built-in only, not a module
As discussed in thread at https://patchwork.kernel.org/patch/1946851/,
there's no value in supporting CONFIG_ACPI_PCI_SLOT=m any more.
So change Kconfig and code to only support building pci_slot as
built-in driver.
Thanks!
Bjorn
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2013-02-16 1:10 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2013-02-13 0:16 [PATCH] ACPI / PCI: Initialize PCI root drivers after PCI bus enumeration Rafael J. Wysocki
2013-02-13 1:54 ` Yinghai Lu
2013-02-13 12:59 ` Rafael J. Wysocki
2013-02-16 1:10 ` Bjorn Helgaas
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