mmotm 2010-07-19 - e1000e vs. pm_qos_update_request issues

mmotm 2010-07-19 - e1000e vs. pm_qos_update_request issues

[Valdis.Kletnieks]

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On Mon, 19 Jul 2010 16:38:09 PDT, akpm@linux-foundation.org said:
> The mm-of-the-moment snapshot 2010-07-19-16-37 has been uploaded to
> 
>    http://userweb.kernel.org/~akpm/mmotm/

Throws a warning at boot:

[    1.786060] WARNING: at kernel/pm_qos_params.c:264 pm_qos_update_request+0x28/0x54()
[    1.786088] Hardware name: Latitude E6500
[    1.787045] pm_qos_update_request() called for unknown object
[    1.787966] Modules linked in:
[    1.788940] Pid: 1, comm: swapper Not tainted 2.6.35-rc5-mmotm0719 #1
[    1.790035] Call Trace:
[    1.791121]  [<ffffffff81037335>] warn_slowpath_common+0x80/0x98
[    1.792205]  [<ffffffff810373e1>] warn_slowpath_fmt+0x41/0x43
[    1.793279]  [<ffffffff81057c14>] pm_qos_update_request+0x28/0x54
[    1.794347]  [<ffffffff8134889e>] e1000_configure+0x421/0x459
[    1.795393]  [<ffffffff8134afbd>] e1000_open+0xbd/0x37c
[    1.796436]  [<ffffffff8105743a>] ? raw_notifier_call_chain+0xf/0x11
[    1.797491]  [<ffffffff8145f948>] __dev_open+0xae/0xe2
[    1.798547]  [<ffffffff8145f997>] dev_open+0x1b/0x49
[    1.799612]  [<ffffffff8146e36e>] netpoll_setup+0x84/0x259
[    1.800685]  [<ffffffff81b5037c>] init_netconsole+0xbc/0x21f
[    1.801744]  [<ffffffff81b5026c>] ? sir_wq_init+0x0/0x35
[    1.802793]  [<ffffffff81b502c0>] ? init_netconsole+0x0/0x21f
[    1.803845]  [<ffffffff810002ff>] do_one_initcall+0x7a/0x12f
[    1.804885]  [<ffffffff81b2ccae>] kernel_init+0x138/0x1c2
[    1.805915]  [<ffffffff81003554>] kernel_thread_helper+0x4/0x10
[    1.806937]  [<ffffffff81590e00>] ? restore_args+0x0/0x30
[    1.807955]  [<ffffffff81b2cb76>] ? kernel_init+0x0/0x1c2
[    1.808958]  [<ffffffff81003550>] ? kernel_thread_helper+0x0/0x10
[    1.809958] ---[ end trace 84b562a00a60539e ]---

Looks like a repeat of something I reported against -mmotm 2010-05-11, though a
WARNING rather than an outright crash - the traceback is pretty much identical.
 I have *no* idea why -rc3-mmotm0701 doesn't whinge similarly.


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Re: mmotm 2010-07-19 - e1000e vs. pm_qos_update_request issues

[Andrew Morton]

On Tue, 20 Jul 2010 16:35:25 -0400
Valdis.Kletnieks@vt.edu wrote:

> On Mon, 19 Jul 2010 16:38:09 PDT, akpm@linux-foundation.org said:
> > The mm-of-the-moment snapshot 2010-07-19-16-37 has been uploaded to
> > 
> >    http://userweb.kernel.org/~akpm/mmotm/
> 
> Throws a warning at boot:
> 
> [    1.786060] WARNING: at kernel/pm_qos_params.c:264 pm_qos_update_request+0x28/0x54()
> [    1.786088] Hardware name: Latitude E6500
> [    1.787045] pm_qos_update_request() called for unknown object
> [    1.787966] Modules linked in:
> [    1.788940] Pid: 1, comm: swapper Not tainted 2.6.35-rc5-mmotm0719 #1
> [    1.790035] Call Trace:
> [    1.791121]  [<ffffffff81037335>] warn_slowpath_common+0x80/0x98
> [    1.792205]  [<ffffffff810373e1>] warn_slowpath_fmt+0x41/0x43
> [    1.793279]  [<ffffffff81057c14>] pm_qos_update_request+0x28/0x54
> [    1.794347]  [<ffffffff8134889e>] e1000_configure+0x421/0x459
> [    1.795393]  [<ffffffff8134afbd>] e1000_open+0xbd/0x37c
> [    1.796436]  [<ffffffff8105743a>] ? raw_notifier_call_chain+0xf/0x11
> [    1.797491]  [<ffffffff8145f948>] __dev_open+0xae/0xe2
> [    1.798547]  [<ffffffff8145f997>] dev_open+0x1b/0x49
> [    1.799612]  [<ffffffff8146e36e>] netpoll_setup+0x84/0x259
> [    1.800685]  [<ffffffff81b5037c>] init_netconsole+0xbc/0x21f
> [    1.801744]  [<ffffffff81b5026c>] ? sir_wq_init+0x0/0x35
> [    1.802793]  [<ffffffff81b502c0>] ? init_netconsole+0x0/0x21f
> [    1.803845]  [<ffffffff810002ff>] do_one_initcall+0x7a/0x12f
> [    1.804885]  [<ffffffff81b2ccae>] kernel_init+0x138/0x1c2
> [    1.805915]  [<ffffffff81003554>] kernel_thread_helper+0x4/0x10
> [    1.806937]  [<ffffffff81590e00>] ? restore_args+0x0/0x30
> [    1.807955]  [<ffffffff81b2cb76>] ? kernel_init+0x0/0x1c2
> [    1.808958]  [<ffffffff81003550>] ? kernel_thread_helper+0x0/0x10
> [    1.809958] ---[ end trace 84b562a00a60539e ]---
> 
> Looks like a repeat of something I reported against -mmotm 2010-05-11, though a
> WARNING rather than an outright crash - the traceback is pretty much identical.
>  I have *no* idea why -rc3-mmotm0701 doesn't whinge similarly.
> 

I don't recall you reporting that, sorry.

The warning was added by

: commit 82f682514a5df89ffb3890627eebf0897b7a84ec
: Author:     James Bottomley <James.Bottomley@suse.de>
: AuthorDate: Mon Jul 5 22:53:06 2010 +0200
: Commit:     Rafael J. Wysocki <rjw@sisk.pl>
: CommitDate: Mon Jul 19 02:00:34 2010 +0200
: 
:     pm_qos: Get rid of the allocation in pm_qos_add_request()


It's a pretty crappy warning too.  Neither the warning nor the code
comments provide developers with any hint as to what they have done
wrong, nor what they must do to fix things.  And the patch changelog
doesn't mention the new warnings *at all*.

So one must assume that the people who stuck this thing in the tree
have volunteered to fix e1000e.  Let's cc 'em.


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[PATCH] Re: mmotm 2010-07-19 - e1000e vs. pm_qos_update_request issues

[Florian Mickler]

On Tue, 20 Jul 2010 14:07:51 -0700
Andrew Morton <akpm@linux-foundation.org> wrote:

> On Tue, 20 Jul 2010 16:35:25 -0400
> Valdis.Kletnieks@vt.edu wrote:
> 
> > On Mon, 19 Jul 2010 16:38:09 PDT, akpm@linux-foundation.org said:
> > > The mm-of-the-moment snapshot 2010-07-19-16-37 has been uploaded to
> > > 
> > >    http://userweb.kernel.org/~akpm/mmotm/
> > 
> > Throws a warning at boot:
> > 
> > [    1.786060] WARNING: at kernel/pm_qos_params.c:264 pm_qos_update_request+0x28/0x54()
> > [    1.786088] Hardware name: Latitude E6500
> > [    1.787045] pm_qos_update_request() called for unknown object
> > [    1.787966] Modules linked in:
> > [    1.788940] Pid: 1, comm: swapper Not tainted 2.6.35-rc5-mmotm0719 #1
> > [    1.790035] Call Trace:
> > [    1.791121]  [<ffffffff81037335>] warn_slowpath_common+0x80/0x98
> > [    1.792205]  [<ffffffff810373e1>] warn_slowpath_fmt+0x41/0x43
> > [    1.793279]  [<ffffffff81057c14>] pm_qos_update_request+0x28/0x54
> > [    1.794347]  [<ffffffff8134889e>] e1000_configure+0x421/0x459
> > [    1.795393]  [<ffffffff8134afbd>] e1000_open+0xbd/0x37c
> > [    1.796436]  [<ffffffff8105743a>] ? raw_notifier_call_chain+0xf/0x11
> > [    1.797491]  [<ffffffff8145f948>] __dev_open+0xae/0xe2
> > [    1.798547]  [<ffffffff8145f997>] dev_open+0x1b/0x49
> > [    1.799612]  [<ffffffff8146e36e>] netpoll_setup+0x84/0x259
> > [    1.800685]  [<ffffffff81b5037c>] init_netconsole+0xbc/0x21f
> > [    1.801744]  [<ffffffff81b5026c>] ? sir_wq_init+0x0/0x35
> > [    1.802793]  [<ffffffff81b502c0>] ? init_netconsole+0x0/0x21f
> > [    1.803845]  [<ffffffff810002ff>] do_one_initcall+0x7a/0x12f
> > [    1.804885]  [<ffffffff81b2ccae>] kernel_init+0x138/0x1c2
> > [    1.805915]  [<ffffffff81003554>] kernel_thread_helper+0x4/0x10
> > [    1.806937]  [<ffffffff81590e00>] ? restore_args+0x0/0x30
> > [    1.807955]  [<ffffffff81b2cb76>] ? kernel_init+0x0/0x1c2
> > [    1.808958]  [<ffffffff81003550>] ? kernel_thread_helper+0x0/0x10
> > [    1.809958] ---[ end trace 84b562a00a60539e ]---
> > 
> > Looks like a repeat of something I reported against -mmotm 2010-05-11, though a
> > WARNING rather than an outright crash - the traceback is pretty much identical.
> >  I have *no* idea why -rc3-mmotm0701 doesn't whinge similarly.
> > 
> 
> I don't recall you reporting that, sorry.
> 
> The warning was added by
> 
> : commit 82f682514a5df89ffb3890627eebf0897b7a84ec
> : Author:     James Bottomley <James.Bottomley@suse.de>
> : AuthorDate: Mon Jul 5 22:53:06 2010 +0200
> : Commit:     Rafael J. Wysocki <rjw@sisk.pl>
> : CommitDate: Mon Jul 19 02:00:34 2010 +0200
> : 
> :     pm_qos: Get rid of the allocation in pm_qos_add_request()
> 
> 
> It's a pretty crappy warning too.  Neither the warning nor the code
> comments provide developers with any hint as to what they have done
> wrong, nor what they must do to fix things.  And the patch changelog
> doesn't mention the new warnings *at all*.
> 
> So one must assume that the people who stuck this thing in the tree
> have volunteered to fix e1000e.  Let's cc 'em.
> 

e1000 calls update_request before registering said request with pm_qos.
This was silently ignored before but now emits a warning. The warning
is sound, because it means, that the constraint-request didn't take
effect.

The right thing is probably to register the request before
calling update_request. 

Attached patch moves the registering from e1000_up to e1000_open and
the unregistering from e1000_down to e1000_close. 
It is only compile-tested as I don't have the hardware.

Cheers,
Flo

p.s.: sorry if this get's mangled or is wrongly formatted, i'm just using
 the "insert file" option of my mailclient and crossing my fingers...


>From 693c71b911ff0845c872261d5704a1d40960722d Mon Sep 17 00:00:00 2001
From: Florian Mickler <florian@mickler.org>
Date: Wed, 21 Jul 2010 08:44:21 +0200
Subject: [PATCH] e1000e: register pm_qos request on hardware activation

The pm_qos_add_request call has to register the pm_qos request with the pm_qos
susbsystem before first use of the pm_qos request via
pm_qos_update_request.

As pm_qos changed to use plists there is no benefit in registering and
unregistering the pm_qos request on ifup/ifdown and thus we move the
registering into e1000_open and the unregistering in e1000_close.

This fixes the following warning:

[    1.786060] WARNING: at kernel/pm_qos_params.c:264
pm_qos_update_request+0x28/0x54()
[    1.786088] Hardware name: Latitude E6500
[    1.787045] pm_qos_update_request() called for unknown object
[    1.787966] Modules linked in:
[    1.788940] Pid: 1, comm: swapper Not tainted 2.6.35-rc5-mmotm0719 #1
[    1.790035] Call Trace:
[    1.791121]  [<ffffffff81037335>] warn_slowpath_common+0x80/0x98
[    1.792205]  [<ffffffff810373e1>] warn_slowpath_fmt+0x41/0x43
[    1.793279]  [<ffffffff81057c14>] pm_qos_update_request+0x28/0x54
[    1.794347]  [<ffffffff8134889e>] e1000_configure+0x421/0x459
[    1.795393]  [<ffffffff8134afbd>] e1000_open+0xbd/0x37c
[    1.796436]  [<ffffffff8105743a>] ? raw_notifier_call_chain+0xf/0x11
[    1.797491]  [<ffffffff8145f948>] __dev_open+0xae/0xe2
[    1.798547]  [<ffffffff8145f997>] dev_open+0x1b/0x49
[    1.799612]  [<ffffffff8146e36e>] netpoll_setup+0x84/0x259
[    1.800685]  [<ffffffff81b5037c>] init_netconsole+0xbc/0x21f
[    1.801744]  [<ffffffff81b5026c>] ? sir_wq_init+0x0/0x35
[    1.802793]  [<ffffffff81b502c0>] ? init_netconsole+0x0/0x21f
[    1.803845]  [<ffffffff810002ff>] do_one_initcall+0x7a/0x12f
[    1.804885]  [<ffffffff81b2ccae>] kernel_init+0x138/0x1c2
[    1.805915]  [<ffffffff81003554>] kernel_thread_helper+0x4/0x10
[    1.806937]  [<ffffffff81590e00>] ? restore_args+0x0/0x30
[    1.807955]  [<ffffffff81b2cb76>] ? kernel_init+0x0/0x1c2
[    1.808958]  [<ffffffff81003550>] ? kernel_thread_helper+0x0/0x10
[    1.809958] ---[ end trace 84b562a00a60539e ]---

Signed-off-by: Florian Mickler <florian@mickler.org>
---
 drivers/net/e1000e/netdev.c |   18 +++++++++---------
 1 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index 8ba366a..1bd9054 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -3218,12 +3218,6 @@ int e1000e_up(struct e1000_adapter *adapter)
 {
 	struct e1000_hw *hw = &adapter->hw;
 
-	/* DMA latency requirement to workaround early-receive/jumbo issue */
-	if (adapter->flags & FLAG_HAS_ERT)
-		pm_qos_add_request(&adapter->netdev->pm_qos_req,
-				   PM_QOS_CPU_DMA_LATENCY,
-				   PM_QOS_DEFAULT_VALUE);
-
 	/* hardware has been reset, we need to reload some things */
 	e1000_configure(adapter);
 
@@ -3287,9 +3281,6 @@ void e1000e_down(struct e1000_adapter *adapter)
 	e1000_clean_tx_ring(adapter);
 	e1000_clean_rx_ring(adapter);
 
-	if (adapter->flags & FLAG_HAS_ERT)
-		pm_qos_remove_request(&adapter->netdev->pm_qos_req);
-
 	/*
 	 * TODO: for power management, we could drop the link and
 	 * pci_disable_device here.
@@ -3524,6 +3515,12 @@ static int e1000_open(struct net_device *netdev)
 	     E1000_MNG_DHCP_COOKIE_STATUS_VLAN))
 		e1000_update_mng_vlan(adapter);
 
+	/* DMA latency requirement to workaround early-receive/jumbo issue */
+	if (adapter->flags & FLAG_HAS_ERT)
+		pm_qos_add_request(&adapter->netdev->pm_qos_req,
+				   PM_QOS_CPU_DMA_LATENCY,
+				   PM_QOS_DEFAULT_VALUE);
+
 	/*
 	 * before we allocate an interrupt, we must be ready to handle it.
 	 * Setting DEBUG_SHIRQ in the kernel makes it fire an interrupt
@@ -3628,6 +3625,9 @@ static int e1000_close(struct net_device *netdev)
 	if (adapter->flags & FLAG_HAS_AMT)
 		e1000_release_hw_control(adapter);
 
+	if (adapter->flags & FLAG_HAS_ERT)
+		pm_qos_remove_request(&adapter->netdev->pm_qos_req);
+
 	pm_runtime_put_sync(&pdev->dev);
 
 	return 0;
-- 
1.7.1.1

Re: mmotm 2010-07-19 - e1000e vs. pm_qos_update_request issues

[mark gross]

On Tue, Jul 20, 2010 at 02:07:51PM -0700, Andrew Morton wrote:
> On Tue, 20 Jul 2010 16:35:25 -0400
> Valdis.Kletnieks@vt.edu wrote:
> 
> > On Mon, 19 Jul 2010 16:38:09 PDT, akpm@linux-foundation.org said:
> > > The mm-of-the-moment snapshot 2010-07-19-16-37 has been uploaded to
> > > 
> > >    http://userweb.kernel.org/~akpm/mmotm/
> > 
> > Throws a warning at boot:
> > 
> > [    1.786060] WARNING: at kernel/pm_qos_params.c:264 pm_qos_update_request+0x28/0x54()
> > [    1.786088] Hardware name: Latitude E6500
> > [    1.787045] pm_qos_update_request() called for unknown object
> > [    1.787966] Modules linked in:
> > [    1.788940] Pid: 1, comm: swapper Not tainted 2.6.35-rc5-mmotm0719 #1
> > [    1.790035] Call Trace:
> > [    1.791121]  [<ffffffff81037335>] warn_slowpath_common+0x80/0x98
> > [    1.792205]  [<ffffffff810373e1>] warn_slowpath_fmt+0x41/0x43
> > [    1.793279]  [<ffffffff81057c14>] pm_qos_update_request+0x28/0x54
> > [    1.794347]  [<ffffffff8134889e>] e1000_configure+0x421/0x459
> > [    1.795393]  [<ffffffff8134afbd>] e1000_open+0xbd/0x37c
> > [    1.796436]  [<ffffffff8105743a>] ? raw_notifier_call_chain+0xf/0x11
> > [    1.797491]  [<ffffffff8145f948>] __dev_open+0xae/0xe2
> > [    1.798547]  [<ffffffff8145f997>] dev_open+0x1b/0x49
> > [    1.799612]  [<ffffffff8146e36e>] netpoll_setup+0x84/0x259
> > [    1.800685]  [<ffffffff81b5037c>] init_netconsole+0xbc/0x21f
> > [    1.801744]  [<ffffffff81b5026c>] ? sir_wq_init+0x0/0x35
> > [    1.802793]  [<ffffffff81b502c0>] ? init_netconsole+0x0/0x21f
> > [    1.803845]  [<ffffffff810002ff>] do_one_initcall+0x7a/0x12f
> > [    1.804885]  [<ffffffff81b2ccae>] kernel_init+0x138/0x1c2
> > [    1.805915]  [<ffffffff81003554>] kernel_thread_helper+0x4/0x10
> > [    1.806937]  [<ffffffff81590e00>] ? restore_args+0x0/0x30
> > [    1.807955]  [<ffffffff81b2cb76>] ? kernel_init+0x0/0x1c2
> > [    1.808958]  [<ffffffff81003550>] ? kernel_thread_helper+0x0/0x10
> > [    1.809958] ---[ end trace 84b562a00a60539e ]---
> > 
> > Looks like a repeat of something I reported against -mmotm 2010-05-11, though a
> > WARNING rather than an outright crash - the traceback is pretty much identical.
> >  I have *no* idea why -rc3-mmotm0701 doesn't whinge similarly.
> > 
> 
> I don't recall you reporting that, sorry.
> 
> The warning was added by
> 
> : commit 82f682514a5df89ffb3890627eebf0897b7a84ec
> : Author:     James Bottomley <James.Bottomley@suse.de>
> : AuthorDate: Mon Jul 5 22:53:06 2010 +0200
> : Commit:     Rafael J. Wysocki <rjw@sisk.pl>
> : CommitDate: Mon Jul 19 02:00:34 2010 +0200
> : 
> :     pm_qos: Get rid of the allocation in pm_qos_add_request()
> 
> 
> It's a pretty crappy warning too.  Neither the warning nor the code
> comments provide developers with any hint as to what they have done
> wrong, nor what they must do to fix things.  And the patch changelog
> doesn't mention the new warnings *at all*.
Sorry about that.  Its my fault, but I thought I had stronger language
in the original warning text.

The warning is for pm_qos users that are attempting to change a request
that isn't even in the list of request.  It was a silent failure in the
original code.  The result of the silent fail is that the request is not
changed as assumed by the caller.

> So one must assume that the people who stuck this thing in the tree
> have volunteered to fix e1000e.  Let's cc 'em.

I'll put a 1000e patch together at the airport, but I wont be able to
test it until tuesday.

--mgross


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Re: [PATCH] Re: mmotm 2010-07-19 - e1000e vs. pm_qos_update_request issues

[mark gross]

On Wed, Jul 21, 2010 at 09:12:00AM +0200, Florian Mickler wrote:
> On Tue, 20 Jul 2010 14:07:51 -0700
> Andrew Morton <akpm@linux-foundation.org> wrote:
> 
> > On Tue, 20 Jul 2010 16:35:25 -0400
> > Valdis.Kletnieks@vt.edu wrote:
> > 
> > > On Mon, 19 Jul 2010 16:38:09 PDT, akpm@linux-foundation.org said:
> > > > The mm-of-the-moment snapshot 2010-07-19-16-37 has been uploaded to
> > > > 
> > > >    http://userweb.kernel.org/~akpm/mmotm/
> > > 
> > > Throws a warning at boot:
> > > 
> > > [    1.786060] WARNING: at kernel/pm_qos_params.c:264 pm_qos_update_request+0x28/0x54()
> > > [    1.786088] Hardware name: Latitude E6500
> > > [    1.787045] pm_qos_update_request() called for unknown object
> > > [    1.787966] Modules linked in:
> > > [    1.788940] Pid: 1, comm: swapper Not tainted 2.6.35-rc5-mmotm0719 #1
> > > [    1.790035] Call Trace:
> > > [    1.791121]  [<ffffffff81037335>] warn_slowpath_common+0x80/0x98
> > > [    1.792205]  [<ffffffff810373e1>] warn_slowpath_fmt+0x41/0x43
> > > [    1.793279]  [<ffffffff81057c14>] pm_qos_update_request+0x28/0x54
> > > [    1.794347]  [<ffffffff8134889e>] e1000_configure+0x421/0x459
> > > [    1.795393]  [<ffffffff8134afbd>] e1000_open+0xbd/0x37c
> > > [    1.796436]  [<ffffffff8105743a>] ? raw_notifier_call_chain+0xf/0x11
> > > [    1.797491]  [<ffffffff8145f948>] __dev_open+0xae/0xe2
> > > [    1.798547]  [<ffffffff8145f997>] dev_open+0x1b/0x49
> > > [    1.799612]  [<ffffffff8146e36e>] netpoll_setup+0x84/0x259
> > > [    1.800685]  [<ffffffff81b5037c>] init_netconsole+0xbc/0x21f
> > > [    1.801744]  [<ffffffff81b5026c>] ? sir_wq_init+0x0/0x35
> > > [    1.802793]  [<ffffffff81b502c0>] ? init_netconsole+0x0/0x21f
> > > [    1.803845]  [<ffffffff810002ff>] do_one_initcall+0x7a/0x12f
> > > [    1.804885]  [<ffffffff81b2ccae>] kernel_init+0x138/0x1c2
> > > [    1.805915]  [<ffffffff81003554>] kernel_thread_helper+0x4/0x10
> > > [    1.806937]  [<ffffffff81590e00>] ? restore_args+0x0/0x30
> > > [    1.807955]  [<ffffffff81b2cb76>] ? kernel_init+0x0/0x1c2
> > > [    1.808958]  [<ffffffff81003550>] ? kernel_thread_helper+0x0/0x10
> > > [    1.809958] ---[ end trace 84b562a00a60539e ]---
> > > 
> > > Looks like a repeat of something I reported against -mmotm 2010-05-11, though a
> > > WARNING rather than an outright crash - the traceback is pretty much identical.
> > >  I have *no* idea why -rc3-mmotm0701 doesn't whinge similarly.
> > > 
> > 
> > I don't recall you reporting that, sorry.
> > 
> > The warning was added by
> > 
> > : commit 82f682514a5df89ffb3890627eebf0897b7a84ec
> > : Author:     James Bottomley <James.Bottomley@suse.de>
> > : AuthorDate: Mon Jul 5 22:53:06 2010 +0200
> > : Commit:     Rafael J. Wysocki <rjw@sisk.pl>
> > : CommitDate: Mon Jul 19 02:00:34 2010 +0200
> > : 
> > :     pm_qos: Get rid of the allocation in pm_qos_add_request()
> > 
> > 
> > It's a pretty crappy warning too.  Neither the warning nor the code
> > comments provide developers with any hint as to what they have done
> > wrong, nor what they must do to fix things.  And the patch changelog
> > doesn't mention the new warnings *at all*.
> > 
> > So one must assume that the people who stuck this thing in the tree
> > have volunteered to fix e1000e.  Let's cc 'em.
> > 
> 
> e1000 calls update_request before registering said request with pm_qos.
> This was silently ignored before but now emits a warning. The warning
> is sound, because it means, that the constraint-request didn't take
> effect.
> 
> The right thing is probably to register the request before
> calling update_request. 
> 
> Attached patch moves the registering from e1000_up to e1000_open and
> the unregistering from e1000_down to e1000_close. 
> It is only compile-tested as I don't have the hardware.
> 
> Cheers,
> Flo
> 
> p.s.: sorry if this get's mangled or is wrongly formatted, i'm just using
>  the "insert file" option of my mailclient and crossing my fingers...
> 
> 
> From 693c71b911ff0845c872261d5704a1d40960722d Mon Sep 17 00:00:00 2001
> From: Florian Mickler <florian@mickler.org>
> Date: Wed, 21 Jul 2010 08:44:21 +0200
> Subject: [PATCH] e1000e: register pm_qos request on hardware activation
> 
> The pm_qos_add_request call has to register the pm_qos request with the pm_qos
> susbsystem before first use of the pm_qos request via
> pm_qos_update_request.
> 
> As pm_qos changed to use plists there is no benefit in registering and
> unregistering the pm_qos request on ifup/ifdown and thus we move the
> registering into e1000_open and the unregistering in e1000_close.
> 
> This fixes the following warning:
> 
> [    1.786060] WARNING: at kernel/pm_qos_params.c:264
> pm_qos_update_request+0x28/0x54()
> [    1.786088] Hardware name: Latitude E6500
> [    1.787045] pm_qos_update_request() called for unknown object
> [    1.787966] Modules linked in:
> [    1.788940] Pid: 1, comm: swapper Not tainted 2.6.35-rc5-mmotm0719 #1
> [    1.790035] Call Trace:
> [    1.791121]  [<ffffffff81037335>] warn_slowpath_common+0x80/0x98
> [    1.792205]  [<ffffffff810373e1>] warn_slowpath_fmt+0x41/0x43
> [    1.793279]  [<ffffffff81057c14>] pm_qos_update_request+0x28/0x54
> [    1.794347]  [<ffffffff8134889e>] e1000_configure+0x421/0x459
> [    1.795393]  [<ffffffff8134afbd>] e1000_open+0xbd/0x37c
> [    1.796436]  [<ffffffff8105743a>] ? raw_notifier_call_chain+0xf/0x11
> [    1.797491]  [<ffffffff8145f948>] __dev_open+0xae/0xe2
> [    1.798547]  [<ffffffff8145f997>] dev_open+0x1b/0x49
> [    1.799612]  [<ffffffff8146e36e>] netpoll_setup+0x84/0x259
> [    1.800685]  [<ffffffff81b5037c>] init_netconsole+0xbc/0x21f
> [    1.801744]  [<ffffffff81b5026c>] ? sir_wq_init+0x0/0x35
> [    1.802793]  [<ffffffff81b502c0>] ? init_netconsole+0x0/0x21f
> [    1.803845]  [<ffffffff810002ff>] do_one_initcall+0x7a/0x12f
> [    1.804885]  [<ffffffff81b2ccae>] kernel_init+0x138/0x1c2
> [    1.805915]  [<ffffffff81003554>] kernel_thread_helper+0x4/0x10
> [    1.806937]  [<ffffffff81590e00>] ? restore_args+0x0/0x30
> [    1.807955]  [<ffffffff81b2cb76>] ? kernel_init+0x0/0x1c2
> [    1.808958]  [<ffffffff81003550>] ? kernel_thread_helper+0x0/0x10
> [    1.809958] ---[ end trace 84b562a00a60539e ]---
> 
> Signed-off-by: Florian Mickler <florian@mickler.org>
> ---
>  drivers/net/e1000e/netdev.c |   18 +++++++++---------
>  1 files changed, 9 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
> index 8ba366a..1bd9054 100644
> --- a/drivers/net/e1000e/netdev.c
> +++ b/drivers/net/e1000e/netdev.c
> @@ -3218,12 +3218,6 @@ int e1000e_up(struct e1000_adapter *adapter)
>  {
>  	struct e1000_hw *hw = &adapter->hw;
>  
> -	/* DMA latency requirement to workaround early-receive/jumbo issue */
> -	if (adapter->flags & FLAG_HAS_ERT)
> -		pm_qos_add_request(&adapter->netdev->pm_qos_req,
> -				   PM_QOS_CPU_DMA_LATENCY,
> -				   PM_QOS_DEFAULT_VALUE);
> -
>  	/* hardware has been reset, we need to reload some things */
>  	e1000_configure(adapter);
>  
> @@ -3287,9 +3281,6 @@ void e1000e_down(struct e1000_adapter *adapter)
>  	e1000_clean_tx_ring(adapter);
>  	e1000_clean_rx_ring(adapter);
>  
> -	if (adapter->flags & FLAG_HAS_ERT)
> -		pm_qos_remove_request(&adapter->netdev->pm_qos_req);
> -
>  	/*
>  	 * TODO: for power management, we could drop the link and
>  	 * pci_disable_device here.
> @@ -3524,6 +3515,12 @@ static int e1000_open(struct net_device *netdev)
>  	     E1000_MNG_DHCP_COOKIE_STATUS_VLAN))
>  		e1000_update_mng_vlan(adapter);
>  
> +	/* DMA latency requirement to workaround early-receive/jumbo issue */
> +	if (adapter->flags & FLAG_HAS_ERT)
> +		pm_qos_add_request(&adapter->netdev->pm_qos_req,
> +				   PM_QOS_CPU_DMA_LATENCY,
> +				   PM_QOS_DEFAULT_VALUE);
> +
>  	/*
>  	 * before we allocate an interrupt, we must be ready to handle it.
>  	 * Setting DEBUG_SHIRQ in the kernel makes it fire an interrupt
> @@ -3628,6 +3625,9 @@ static int e1000_close(struct net_device *netdev)
>  	if (adapter->flags & FLAG_HAS_AMT)
>  		e1000_release_hw_control(adapter);
>  
> +	if (adapter->flags & FLAG_HAS_ERT)
> +		pm_qos_remove_request(&adapter->netdev->pm_qos_req);
> +
>  	pm_runtime_put_sync(&pdev->dev);
>  
>  	return 0;
> -- 
> 1.7.1.1
>

wow!  thanks!  I'll test this when I get back next tuesday.

--mgross

Re: [PATCH] Re: mmotm 2010-07-19 - e1000e vs. pm_qos_update_request issues

[Valdis.Kletnieks]

[-- Attachment #1: Type: text/plain, Size: 1072 bytes --]

On Wed, 21 Jul 2010 09:12:00 +0200, Florian Mickler said:

> Attached patch moves the registering from e1000_up to e1000_open and
> the unregistering from e1000_down to e1000_close. 
> It is only compile-tested as I don't have the hardware.

My laptop has the hardware, so I tested it - system does indeed boot
without whinging about this issue.  Feel free to stick in a:

Tested-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>

Thanks for the fast fix. :)

> From 693c71b911ff0845c872261d5704a1d40960722d Mon Sep 17 00:00:00 2001
> From: Florian Mickler <florian@mickler.org>
> Date: Wed, 21 Jul 2010 08:44:21 +0200
> Subject: [PATCH] e1000e: register pm_qos request on hardware activation
> 
> The pm_qos_add_request call has to register the pm_qos request with the pm_qos
> susbsystem before first use of the pm_qos request via
> pm_qos_update_request.
> 
> As pm_qos changed to use plists there is no benefit in registering and
> unregistering the pm_qos request on ifup/ifdown and thus we move the
> registering into e1000_open and the unregistering in e1000_close.



[-- Attachment #2: Type: application/pgp-signature, Size: 227 bytes --]

Re: [PATCH] Re: mmotm 2010-07-19 - e1000e vs. pm_qos_update_request issues

[Rafael J. Wysocki]

On Thursday, July 22, 2010, Valdis.Kletnieks@vt.edu wrote:
> On Wed, 21 Jul 2010 09:12:00 +0200, Florian Mickler said:
> 
> > Attached patch moves the registering from e1000_up to e1000_open and
> > the unregistering from e1000_down to e1000_close. 
> > It is only compile-tested as I don't have the hardware.
> 
> My laptop has the hardware, so I tested it - system does indeed boot
> without whinging about this issue.  Feel free to stick in a:
> 
> Tested-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
> 
> Thanks for the fast fix. :)

I'm going to add the patch to the suspend-2.6 tree.  Any objections?

> > From 693c71b911ff0845c872261d5704a1d40960722d Mon Sep 17 00:00:00 2001
> > From: Florian Mickler <florian@mickler.org>
> > Date: Wed, 21 Jul 2010 08:44:21 +0200
> > Subject: [PATCH] e1000e: register pm_qos request on hardware activation
> > 
> > The pm_qos_add_request call has to register the pm_qos request with the pm_qos
> > susbsystem before first use of the pm_qos request via
> > pm_qos_update_request.
> > 
> > As pm_qos changed to use plists there is no benefit in registering and
> > unregistering the pm_qos request on ifup/ifdown and thus we move the
> > registering into e1000_open and the unregistering in e1000_close.

Rafael

Re: [PATCH] Re: mmotm 2010-07-19 - e1000e vs. pm_qos_update_request issues

[Jeff Kirsher]

On Wed, Jul 21, 2010 at 00:12, Florian Mickler <florian@mickler.org> wrote:
> On Tue, 20 Jul 2010 14:07:51 -0700
> Andrew Morton <akpm@linux-foundation.org> wrote:
>
>> On Tue, 20 Jul 2010 16:35:25 -0400
>> Valdis.Kletnieks@vt.edu wrote:
>>
>> > On Mon, 19 Jul 2010 16:38:09 PDT, akpm@linux-foundation.org said:
>> > > The mm-of-the-moment snapshot 2010-07-19-16-37 has been uploaded to
>> > >
>> > >    http://userweb.kernel.org/~akpm/mmotm/
>> >
>> > Throws a warning at boot:
>> >
>> > [    1.786060] WARNING: at kernel/pm_qos_params.c:264 pm_qos_update_request+0x28/0x54()
>> > [    1.786088] Hardware name: Latitude E6500
>> > [    1.787045] pm_qos_update_request() called for unknown object
>> > [    1.787966] Modules linked in:
>> > [    1.788940] Pid: 1, comm: swapper Not tainted 2.6.35-rc5-mmotm0719 #1
>> > [    1.790035] Call Trace:
>> > [    1.791121]  [<ffffffff81037335>] warn_slowpath_common+0x80/0x98
>> > [    1.792205]  [<ffffffff810373e1>] warn_slowpath_fmt+0x41/0x43
>> > [    1.793279]  [<ffffffff81057c14>] pm_qos_update_request+0x28/0x54
>> > [    1.794347]  [<ffffffff8134889e>] e1000_configure+0x421/0x459
>> > [    1.795393]  [<ffffffff8134afbd>] e1000_open+0xbd/0x37c
>> > [    1.796436]  [<ffffffff8105743a>] ? raw_notifier_call_chain+0xf/0x11
>> > [    1.797491]  [<ffffffff8145f948>] __dev_open+0xae/0xe2
>> > [    1.798547]  [<ffffffff8145f997>] dev_open+0x1b/0x49
>> > [    1.799612]  [<ffffffff8146e36e>] netpoll_setup+0x84/0x259
>> > [    1.800685]  [<ffffffff81b5037c>] init_netconsole+0xbc/0x21f
>> > [    1.801744]  [<ffffffff81b5026c>] ? sir_wq_init+0x0/0x35
>> > [    1.802793]  [<ffffffff81b502c0>] ? init_netconsole+0x0/0x21f
>> > [    1.803845]  [<ffffffff810002ff>] do_one_initcall+0x7a/0x12f
>> > [    1.804885]  [<ffffffff81b2ccae>] kernel_init+0x138/0x1c2
>> > [    1.805915]  [<ffffffff81003554>] kernel_thread_helper+0x4/0x10
>> > [    1.806937]  [<ffffffff81590e00>] ? restore_args+0x0/0x30
>> > [    1.807955]  [<ffffffff81b2cb76>] ? kernel_init+0x0/0x1c2
>> > [    1.808958]  [<ffffffff81003550>] ? kernel_thread_helper+0x0/0x10
>> > [    1.809958] ---[ end trace 84b562a00a60539e ]---
>> >
>> > Looks like a repeat of something I reported against -mmotm 2010-05-11, though a
>> > WARNING rather than an outright crash - the traceback is pretty much identical.
>> >  I have *no* idea why -rc3-mmotm0701 doesn't whinge similarly.
>> >
>>
>> I don't recall you reporting that, sorry.
>>
>> The warning was added by
>>
>> : commit 82f682514a5df89ffb3890627eebf0897b7a84ec
>> : Author:     James Bottomley <James.Bottomley@suse.de>
>> : AuthorDate: Mon Jul 5 22:53:06 2010 +0200
>> : Commit:     Rafael J. Wysocki <rjw@sisk.pl>
>> : CommitDate: Mon Jul 19 02:00:34 2010 +0200
>> :
>> :     pm_qos: Get rid of the allocation in pm_qos_add_request()
>>
>>
>> It's a pretty crappy warning too.  Neither the warning nor the code
>> comments provide developers with any hint as to what they have done
>> wrong, nor what they must do to fix things.  And the patch changelog
>> doesn't mention the new warnings *at all*.
>>
>> So one must assume that the people who stuck this thing in the tree
>> have volunteered to fix e1000e.  Let's cc 'em.
>>
>
> e1000 calls update_request before registering said request with pm_qos.
> This was silently ignored before but now emits a warning. The warning
> is sound, because it means, that the constraint-request didn't take
> effect.
>
> The right thing is probably to register the request before
> calling update_request.
>
> Attached patch moves the registering from e1000_up to e1000_open and
> the unregistering from e1000_down to e1000_close.
> It is only compile-tested as I don't have the hardware.
>
> Cheers,
> Flo
>
> p.s.: sorry if this get's mangled or is wrongly formatted, i'm just using
>  the "insert file" option of my mailclient and crossing my fingers...
>
>
> From 693c71b911ff0845c872261d5704a1d40960722d Mon Sep 17 00:00:00 2001
> From: Florian Mickler <florian@mickler.org>
> Date: Wed, 21 Jul 2010 08:44:21 +0200
> Subject: [PATCH] e1000e: register pm_qos request on hardware activation
>
> The pm_qos_add_request call has to register the pm_qos request with the pm_qos
> susbsystem before first use of the pm_qos request via
> pm_qos_update_request.
>
> As pm_qos changed to use plists there is no benefit in registering and
> unregistering the pm_qos request on ifup/ifdown and thus we move the
> registering into e1000_open and the unregistering in e1000_close.
>
> This fixes the following warning:
>
> [    1.786060] WARNING: at kernel/pm_qos_params.c:264
> pm_qos_update_request+0x28/0x54()
> [    1.786088] Hardware name: Latitude E6500
> [    1.787045] pm_qos_update_request() called for unknown object
> [    1.787966] Modules linked in:
> [    1.788940] Pid: 1, comm: swapper Not tainted 2.6.35-rc5-mmotm0719 #1
> [    1.790035] Call Trace:
> [    1.791121]  [<ffffffff81037335>] warn_slowpath_common+0x80/0x98
> [    1.792205]  [<ffffffff810373e1>] warn_slowpath_fmt+0x41/0x43
> [    1.793279]  [<ffffffff81057c14>] pm_qos_update_request+0x28/0x54
> [    1.794347]  [<ffffffff8134889e>] e1000_configure+0x421/0x459
> [    1.795393]  [<ffffffff8134afbd>] e1000_open+0xbd/0x37c
> [    1.796436]  [<ffffffff8105743a>] ? raw_notifier_call_chain+0xf/0x11
> [    1.797491]  [<ffffffff8145f948>] __dev_open+0xae/0xe2
> [    1.798547]  [<ffffffff8145f997>] dev_open+0x1b/0x49
> [    1.799612]  [<ffffffff8146e36e>] netpoll_setup+0x84/0x259
> [    1.800685]  [<ffffffff81b5037c>] init_netconsole+0xbc/0x21f
> [    1.801744]  [<ffffffff81b5026c>] ? sir_wq_init+0x0/0x35
> [    1.802793]  [<ffffffff81b502c0>] ? init_netconsole+0x0/0x21f
> [    1.803845]  [<ffffffff810002ff>] do_one_initcall+0x7a/0x12f
> [    1.804885]  [<ffffffff81b2ccae>] kernel_init+0x138/0x1c2
> [    1.805915]  [<ffffffff81003554>] kernel_thread_helper+0x4/0x10
> [    1.806937]  [<ffffffff81590e00>] ? restore_args+0x0/0x30
> [    1.807955]  [<ffffffff81b2cb76>] ? kernel_init+0x0/0x1c2
> [    1.808958]  [<ffffffff81003550>] ? kernel_thread_helper+0x0/0x10
> [    1.809958] ---[ end trace 84b562a00a60539e ]---
>
> Signed-off-by: Florian Mickler <florian@mickler.org>
> ---
>  drivers/net/e1000e/netdev.c |   18 +++++++++---------
>  1 files changed, 9 insertions(+), 9 deletions(-)
>

Thanks I have added the patch to my queue.

-- 
Cheers,
Jeff

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