[RFC,v1,0/9] deferred_probe_timeout logic clean up

This series is based on linux-next + these 2 small patches applies on top:
https://lore.kernel.org/lkml/20220526034609.480766-1-saravanak@google.com/

A lot of the deferred_probe_timeout logic is redundant with
fw_devlink=on.  Also, enabling deferred_probe_timeout by default breaks
a few cases.

This series tries to delete the redundant logic, simplify the frameworks
that use driver_deferred_probe_check_state(), enable
deferred_probe_timeout=10 by default, and fixes the nfsroot failure
case.

Patches 1 to 3 are fairly straightforward and can probably be applied
right away.

Patches 4 to 9 are related and are the complicated bits of this series.

Patch 8 is where someone with more knowledge of the IP auto config code
can help rewrite the patch to limit the scope of the workaround by
running the work around only if IP auto config fails the first time
around. But it's also something that can be optimized in the future
because it's already limited to the case where IP auto config is enabled
using the kernel commandline.

Yoshihiro/Geert,

If you can test this patch series and confirm that the NFS root case
works, I'd really appreciate that.

Cc: Mark Brown <broonie@kernel.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Cc: John Stultz <jstultz@google.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

Saravana Kannan (9):
  PM: domains: Delete usage of driver_deferred_probe_check_state()
  pinctrl: devicetree: Delete usage of driver_deferred_probe_check_state()
  net: mdio: Delete usage of driver_deferred_probe_check_state()
  Revert "driver core: Set default deferred_probe_timeout back to 0."
  driver core: Set fw_devlink.strict=1 by default
  iommu/of: Delete usage of driver_deferred_probe_check_state()
  driver core: Add fw_devlink_unblock_may_probe() helper function
  net: ipconfig: Force fw_devlink to unblock any devices that might probe
  driver core: Delete driver_deferred_probe_check_state()

 drivers/base/base.h            |  1 +
 drivers/base/core.c            | 60 +++++++++++++++++++++++++++++++++-
 drivers/base/dd.c              | 37 ++++-----------------
 drivers/base/power/domain.c    |  2 +-
 drivers/iommu/of_iommu.c       |  2 +-
 drivers/net/mdio/fwnode_mdio.c |  4 +--
 drivers/pinctrl/devicetree.c   |  2 +-
 include/linux/device/driver.h  |  1 -
 include/linux/fwnode.h         |  2 ++
 net/ipv4/ipconfig.c            |  2 ++
 10 files changed, 74 insertions(+), 39 deletions(-)

On 2022-05-26 01:15:39 [-0700], Saravana Kannan wrote:
> Yoshihiro/Geert,
Hi Saravana,

> If you can test this patch series and confirm that the NFS root case
> works, I'd really appreciate that.

The two patches you sent earlier, plus this series, plus

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 7ff7fbb006431..829d9b1f7403f 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -1697,8 +1697,6 @@ static int fw_devlink_may_probe(struct device *dev, void *data)
  */
 void __init fw_devlink_unblock_may_probe(void)
 {
-	struct device_link *link, *ln;
-
 	if (!fw_devlink_flags || fw_devlink_is_permissive())
 		return;
 
and it compiles + boots without a delay.

Sebastian

Hi Saravana,

On Thu, May 26, 2022 at 10:15 AM Saravana Kannan <saravanak@google.com> wrote:
> This series is based on linux-next + these 2 small patches applies on top:
> https://lore.kernel.org/lkml/20220526034609.480766-1-saravanak@google.com/
>
> A lot of the deferred_probe_timeout logic is redundant with
> fw_devlink=on.  Also, enabling deferred_probe_timeout by default breaks
> a few cases.
>
> This series tries to delete the redundant logic, simplify the frameworks
> that use driver_deferred_probe_check_state(), enable
> deferred_probe_timeout=10 by default, and fixes the nfsroot failure
> case.
>
> Patches 1 to 3 are fairly straightforward and can probably be applied
> right away.
>
> Patches 4 to 9 are related and are the complicated bits of this series.
>
> Patch 8 is where someone with more knowledge of the IP auto config code
> can help rewrite the patch to limit the scope of the workaround by
> running the work around only if IP auto config fails the first time
> around. But it's also something that can be optimized in the future
> because it's already limited to the case where IP auto config is enabled
> using the kernel commandline.

Thanks for your series!

> Yoshihiro/Geert,
>
> If you can test this patch series and confirm that the NFS root case
> works, I'd really appreciate that.

On Salvator-XS, Micrel KSZ9031 Gigabit PHY probe is no longer delayed
by 9s after applying the two earlier patches, and the same is true
after applying this series on top.
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>

I will do testing on more boards, but that may take a while, as we're
in the middle of the merge window.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

On Mon, May 30, 2022 at 2:38 AM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>
> Hi Saravana,
>
> On Thu, May 26, 2022 at 10:15 AM Saravana Kannan <saravanak@google.com> wrote:
> > This series is based on linux-next + these 2 small patches applies on top:
> > https://lore.kernel.org/lkml/20220526034609.480766-1-saravanak@google.com/
> >
> > A lot of the deferred_probe_timeout logic is redundant with
> > fw_devlink=on.  Also, enabling deferred_probe_timeout by default breaks
> > a few cases.
> >
> > This series tries to delete the redundant logic, simplify the frameworks
> > that use driver_deferred_probe_check_state(), enable
> > deferred_probe_timeout=10 by default, and fixes the nfsroot failure
> > case.
> >
> > Patches 1 to 3 are fairly straightforward and can probably be applied
> > right away.
> >
> > Patches 4 to 9 are related and are the complicated bits of this series.
> >
> > Patch 8 is where someone with more knowledge of the IP auto config code
> > can help rewrite the patch to limit the scope of the workaround by
> > running the work around only if IP auto config fails the first time
> > around. But it's also something that can be optimized in the future
> > because it's already limited to the case where IP auto config is enabled
> > using the kernel commandline.
>
> Thanks for your series!
>
> > Yoshihiro/Geert,
> >
> > If you can test this patch series and confirm that the NFS root case
> > works, I'd really appreciate that.
>
> On Salvator-XS, Micrel KSZ9031 Gigabit PHY probe is no longer delayed
> by 9s after applying the two earlier patches, and the same is true
> after applying this series on top.
> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
>
> I will do testing on more boards, but that may take a while, as we're
> in the middle of the merge window.

Thanks for testing. I missed your email until now. I sent out a v2
series a few days back and that's a much better solution than v1. If
you can test that series instead, that'd be nice.

-Saravana