[PATCH v4 00/12] kgdb: Support late serial drivers; enable early debug w/ boot consoles

[PATCH v4 00/12] kgdb: Support late serial drivers; enable early debug w/ boot consoles

[Douglas Anderson]

This whole pile of patches was motivated by me trying to get kgdb to
work properly on a platform where my serial driver ended up being hit
by the -EPROBE_DEFER virus (it wasn't practicing social distancing
from other drivers).  Specifically my serial driver's parent device
depended on a resource that wasn't available when its probe was first
called.  It returned -EPROBE_DEFER which meant that when "kgdboc"
tried to run its setup the serial driver wasn't there.  Unfortunately
"kgdboc" never tried again, so that meant that kgdb was disabled until
I manually enalbed it via sysfs.

While I could try to figure out how to get around the -EPROBE_DEFER
somehow, the above problems could happen to anyone and -EPROBE_DEFER
is generally considered something you just have to live with.  In any
case the current "kgdboc" setup is a bit of a race waiting to happen.
I _think_ I saw during early testing that even adding a msleep() in
the typical serial driver's probe() is enough to trigger similar
issues.

I decided that for the above race the best attitude to get kgdb to
register at boot was probably "if you can't beat 'em, join 'em".
Thus, "kgdboc" now jumps on the -EPROBE_DEFER bandwagon (now that my
driver uses it it's no longer a virus).  It does so a little awkwardly
because "kgdboc" hasn't normally had a "struct device" associated with
it, but it's really not _that_ ugly to make a platform device and
seems less ugly than alternatives.

Unfortunately now on my system the debugger is one of the last things
to register at boot.  That's OK for debugging problems that show up
significantly after boot, but isn't so hot for all the boot problems
that I end up debugging.  This motivated me to try to get something
working a little earlier.

My first attempt was to try to get the existing "ekgdboc" to work
earlier.  I tried that for a bit until I realized that it needed to
work at the tty layer and I couldn't find any serial drivers that
managed to register themselves to the tty layer super early at boot.
The only documented use of "ekgdboc" is "ekgdboc=kbd" and that's a bit
of a special snowflake.  Trying to get my serial driver and all its
dependencies to probe normally and register the tty driver super early
at boot seemed like a bad way to go.  In fact, all the complexity
needed to do something like this is why the system already has a
special concept of a "boot console" that lives only long enough to
transition to the normal console.

Leveraging the boot console seemed like a good way to go and that's
what this series does.  I found that consoles could have a read()
function, though I couldn't find anyone who implemented it.  I
implemented it for two serial drivers for the devices I had easy
access to, making the assumption that for boot consoles that we could
assume read() and write() were polling-compatible (seems sane I
think).

Now anyone who makes a small change to their serial driver can easily
enable early kgdb debugging!

The devices I had for testing were:
- arm32: rk3288-veyron-jerry
- arm64: rk3399-gru-kevin
- arm64: qcom-sc7180-trogdor (not mainline yet)

These are the devices I tested this series on.  I tried to test
various combinations of enabling/disabling various options and I
hopefully caught the corner cases, but I'd appreciate any extra
testing people can do.  Notably I didn't test on x86, but (I think) I
didn't touch much there so I shouldn't have broken anything.

When testing I found a few problems with actually dropping into the
debugger super early on arm and arm64 devices.  Patches in this series
should help with this.  For arm I just avoid dropping into the
debugger until a little later and for arm64 I actually enable
debugging super early.

I realize that bits of this series might feel a little hacky, though
I've tried to do things in the cleanest way I could without overly
interferring with the rest of the kernel.  If you hate the way I
solved a problem I would love it if you could provide guidance on how
you think I could solve the problem better.

This series (and my comments / documentation / commit messages) are
now long enough that my eyes glaze over when I try to read it all over
to double-check.  I've nontheless tried to double-check it, but I'm
pretty sure I did something stupid.  Thank you ahead of time for
pointing it out to me so I can fix it in v5.  If somehow I managed to
not do anything stupid (really?) then thank you for double-checking me
anyway.

NOTE: v3 of the patch series tacks on support for an extra serial
driver from Sumit Garg.  I've piled it onto the end of my series at
his request just to keep everything together.

Changes in v4:
- ("kgdboc: Remove useless #ifdef...") new for v4.
- Add "if KGDB" to "select ARCH_HAS_EARLY_DEBUG" in Kconfig.
- Add comment about why we always return 0 in kgdboc_earlycon_init().
- Major overhauls to commit message.
- No more #ifdef CONFIG_KGDB_SERIAL_CONSOLE.
- Now keep using bootcon even when the system stops.
- Print "replacing" message before calling deinit().
- earlycon should be static.
- s/The the/The/

Changes in v3:
- ("kgdb: Prevent infinite recursive entries to the debugger") new for v3.
- ("serial: amba-pl011: Support kgdboc_earlycon") pulled into my v3.
- Add deinit() to I/O ops to know a driver can be replaced.
- Added example in kgdb.rst
- Change boolean weak function to KConfig.
- Don't just neuter input, panic if earlycon vanishes.
- No extra param to kgdb_register_io_module().
- Removed unneeded sentence in kerenel-parameters doc.
- Renamed earlycon_kgdboc to kgdboc_earlycon.
- Simplify earlycon_kgdb deinit by using the deinit() function.
- Suggest people use kgdboc_earlycon instead of ekgdboc.
- { ; } ==> { }

Changes in v2:
- ("Revert "kgdboc: disable the console lock when in kgdb"") new for v2.
- ("kgdb: Disable WARN_CONSOLE_UNLOCKED for all kgdb") new for v2.
- Assumes we have ("kgdb: Disable WARN_CONSOLE_UNLOCKED for all kgdb")
- Fix kgdbts, tty/mips_ejtag_fdc, and usb/early/ehci-dbgp

Douglas Anderson (11):
  kgdb: Disable WARN_CONSOLE_UNLOCKED for all kgdb
  Revert "kgdboc: disable the console lock when in kgdb"
  kgdboc: Use a platform device to handle tty drivers showing up late
  kgdb: Delay "kgdbwait" to dbg_late_init() by default
  arm64: Add call_break_hook() to early_brk64() for early kgdb
  kgdb: Prevent infinite recursive entries to the debugger
  kgdboc: Remove useless #ifdef CONFIG_KGDB_SERIAL_CONSOLE in kgdboc
  kgdboc: Add kgdboc_earlycon to support early kgdb using boot consoles
  Documentation: kgdboc: Document new kgdboc_earlycon parameter
  serial: qcom_geni_serial: Support kgdboc_earlycon
  serial: 8250_early: Support kgdboc_earlycon

Sumit Garg (1):
  serial: amba-pl011: Support kgdboc_earlycon

 .../admin-guide/kernel-parameters.txt         |  20 ++
 Documentation/dev-tools/kgdb.rst              |  24 ++
 arch/arm64/Kconfig                            |   1 +
 arch/arm64/include/asm/debug-monitors.h       |   2 +
 arch/arm64/kernel/debug-monitors.c            |   2 +-
 arch/arm64/kernel/traps.c                     |   3 +
 arch/x86/Kconfig                              |   1 +
 drivers/tty/serial/8250/8250_early.c          |  23 ++
 drivers/tty/serial/amba-pl011.c               |  32 +++
 drivers/tty/serial/kgdboc.c                   | 268 ++++++++++++++++--
 drivers/tty/serial/qcom_geni_serial.c         |  32 +++
 include/linux/kgdb.h                          |   4 +
 kernel/debug/debug_core.c                     |  52 +++-
 lib/Kconfig.kgdb                              |  18 ++
 14 files changed, 436 insertions(+), 46 deletions(-)

-- 
2.26.2.645.ge9eca65c58-goog


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[PATCH v4 05/12] arm64: Add call_break_hook() to early_brk64() for early kgdb

[Douglas Anderson]

In order to make early kgdb work properly we need early_brk64() to be
able to call into it.  This is as easy as adding a call into
call_break_hook() just like we do later in the normal brk_handler().

Once we do this we can let kgdb know that it can break into the
debugger a little earlier (specifically when parsing early_param's).

NOTE: without this patch it turns out that arm64 can't do breakpoints
even at dbg_late_init(), so if we decide something about this patch is
wrong we might need to move dbg_late_init() a little later.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
---

Changes in v4:
- Add "if KGDB" to "select ARCH_HAS_EARLY_DEBUG" in Kconfig.

Changes in v3:
- Change boolean weak function to KConfig.

Changes in v2: None

 arch/arm64/Kconfig                      | 1 +
 arch/arm64/include/asm/debug-monitors.h | 2 ++
 arch/arm64/kernel/debug-monitors.c      | 2 +-
 arch/arm64/kernel/traps.c               | 3 +++
 4 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 40fb05d96c60..3d78f581269c 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -13,6 +13,7 @@ config ARM64
 	select ARCH_HAS_DEVMEM_IS_ALLOWED
 	select ARCH_HAS_DMA_PREP_COHERENT
 	select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
+	select ARCH_HAS_EARLY_DEBUG if KGDB
 	select ARCH_HAS_FAST_MULTIPLIER
 	select ARCH_HAS_FORTIFY_SOURCE
 	select ARCH_HAS_GCOV_PROFILE_ALL
diff --git a/arch/arm64/include/asm/debug-monitors.h b/arch/arm64/include/asm/debug-monitors.h
index 7619f473155f..2d82a0314d29 100644
--- a/arch/arm64/include/asm/debug-monitors.h
+++ b/arch/arm64/include/asm/debug-monitors.h
@@ -97,6 +97,8 @@ void unregister_user_break_hook(struct break_hook *hook);
 void register_kernel_break_hook(struct break_hook *hook);
 void unregister_kernel_break_hook(struct break_hook *hook);
 
+int call_break_hook(struct pt_regs *regs, unsigned int esr);
+
 u8 debug_monitors_arch(void);
 
 enum dbg_active_el {
diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c
index 48222a4760c2..59c353dfc8e9 100644
--- a/arch/arm64/kernel/debug-monitors.c
+++ b/arch/arm64/kernel/debug-monitors.c
@@ -297,7 +297,7 @@ void unregister_kernel_break_hook(struct break_hook *hook)
 	unregister_debug_hook(&hook->node);
 }
 
-static int call_break_hook(struct pt_regs *regs, unsigned int esr)
+int call_break_hook(struct pt_regs *regs, unsigned int esr)
 {
 	struct break_hook *hook;
 	struct list_head *list;
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index cf402be5c573..a8173f0c1774 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -1044,6 +1044,9 @@ int __init early_brk64(unsigned long addr, unsigned int esr,
 	if ((comment & ~KASAN_BRK_MASK) == KASAN_BRK_IMM)
 		return kasan_handler(regs, esr) != DBG_HOOK_HANDLED;
 #endif
+	if (call_break_hook(regs, esr) == DBG_HOOK_HANDLED)
+		return 0;
+
 	return bug_handler(regs, esr) != DBG_HOOK_HANDLED;
 }
 
-- 
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Re: [PATCH v4 05/12] arm64: Add call_break_hook() to early_brk64() for early kgdb

[Doug Anderson]

Hi,

On Thu, May 7, 2020 at 1:09 PM Douglas Anderson <dianders@chromium.org> wrote:
>
> In order to make early kgdb work properly we need early_brk64() to be
> able to call into it.  This is as easy as adding a call into
> call_break_hook() just like we do later in the normal brk_handler().
>
> Once we do this we can let kgdb know that it can break into the
> debugger a little earlier (specifically when parsing early_param's).
>
> NOTE: without this patch it turns out that arm64 can't do breakpoints
> even at dbg_late_init(), so if we decide something about this patch is
> wrong we might need to move dbg_late_init() a little later.
>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will@kernel.org>
> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
> ---
>
> Changes in v4:
> - Add "if KGDB" to "select ARCH_HAS_EARLY_DEBUG" in Kconfig.
>
> Changes in v3:
> - Change boolean weak function to KConfig.
>
> Changes in v2: None
>
>  arch/arm64/Kconfig                      | 1 +
>  arch/arm64/include/asm/debug-monitors.h | 2 ++
>  arch/arm64/kernel/debug-monitors.c      | 2 +-
>  arch/arm64/kernel/traps.c               | 3 +++
>  4 files changed, 7 insertions(+), 1 deletion(-)

As discussed in the replies to the v3 version of this patch [1], I
have posted a replacement patch for this one [2].  After the cut in
the replacement patch I talk about different ways it could land.
Hopefully that's not too confusing.  I can also re-spam everyone with
a v5 of the whole series if that makes it clearer.

[1] https://lore.kernel.org/r/20200428141218.v3.5.I22067ad43e77ddfd4b64c2d49030628480f9e8d9@changeid
[2] https://lore.kernel.org/r/20200513160501.1.I0b5edf030cc6ebef6ab4829f8867cdaea42485d8@changeid

-Doug

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Re: [PATCH v4 00/12] kgdb: Support late serial drivers; enable early debug w/ boot consoles

[Daniel Thompson]

On Thu, May 07, 2020 at 01:08:38PM -0700, Douglas Anderson wrote:
> <snip>
>
> My first attempt was to try to get the existing "ekgdboc" to work
> earlier.  I tried that for a bit until I realized that it needed to
> work at the tty layer and I couldn't find any serial drivers that
> managed to register themselves to the tty layer super early at boot.
> The only documented use of "ekgdboc" is "ekgdboc=kbd" and that's a bit
> of a special snowflake.  Trying to get my serial driver and all its
> dependencies to probe normally and register the tty driver super early
> at boot seemed like a bad way to go.  In fact, all the complexity
> needed to do something like this is why the system already has a
> special concept of a "boot console" that lives only long enough to
> transition to the normal console.
> 
> <snip>
> 
> The devices I had for testing were:
> - arm32: rk3288-veyron-jerry
> - arm64: rk3399-gru-kevin
> - arm64: qcom-sc7180-trogdor (not mainline yet)
> 
> These are the devices I tested this series on.  I tried to test
> various combinations of enabling/disabling various options and I
> hopefully caught the corner cases, but I'd appreciate any extra
> testing people can do.  Notably I didn't test on x86, but (I think) I
> didn't touch much there so I shouldn't have broken anything.

I have tested a slightly earlier version using qemu and will test this
set before it moves forwards.


>  .../admin-guide/kernel-parameters.txt         |  20 ++
>  Documentation/dev-tools/kgdb.rst              |  24 ++
>  arch/arm64/Kconfig                            |   1 +
>  arch/arm64/include/asm/debug-monitors.h       |   2 +
>  arch/arm64/kernel/debug-monitors.c            |   2 +-
>  arch/arm64/kernel/traps.c                     |   3 +
>  arch/x86/Kconfig                              |   1 +
>  drivers/tty/serial/8250/8250_early.c          |  23 ++
>  drivers/tty/serial/amba-pl011.c               |  32 +++
>  drivers/tty/serial/kgdboc.c                   | 268 ++++++++++++++++--
>  drivers/tty/serial/qcom_geni_serial.c         |  32 +++
>  include/linux/kgdb.h                          |   4 +
>  kernel/debug/debug_core.c                     |  52 +++-
>  lib/Kconfig.kgdb                              |  18 ++
>  14 files changed, 436 insertions(+), 46 deletions(-)

Any thoughts on how best to land these changes?

AFAICT the arm64 and 8250/amba-pl011/qcom_geni_serial code
could be applied independently of the kgdb changes (though we must keep
changes to drivers/tty/serial/kgdboc alongside the kgdb changes).

I can hoover them up but I'd need a solid set of acks and
I don't think we've got that yet.

I'd also be happy to ack where needed and let someone else pick it up
(the other changes queued for kgdb this cycle are pretty small so we
shouldn't see much conflict in kernel/debug/ ).


Daniel.

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Re: [PATCH v4 00/12] kgdb: Support late serial drivers; enable early debug w/ boot consoles

[Doug Anderson]

Hi,

On Thu, May 14, 2020 at 9:21 AM Daniel Thompson
<daniel.thompson@linaro.org> wrote:
>
> On Thu, May 07, 2020 at 01:08:38PM -0700, Douglas Anderson wrote:
> > <snip>
> >
> > My first attempt was to try to get the existing "ekgdboc" to work
> > earlier.  I tried that for a bit until I realized that it needed to
> > work at the tty layer and I couldn't find any serial drivers that
> > managed to register themselves to the tty layer super early at boot.
> > The only documented use of "ekgdboc" is "ekgdboc=kbd" and that's a bit
> > of a special snowflake.  Trying to get my serial driver and all its
> > dependencies to probe normally and register the tty driver super early
> > at boot seemed like a bad way to go.  In fact, all the complexity
> > needed to do something like this is why the system already has a
> > special concept of a "boot console" that lives only long enough to
> > transition to the normal console.
> >
> > <snip>
> >
> > The devices I had for testing were:
> > - arm32: rk3288-veyron-jerry
> > - arm64: rk3399-gru-kevin
> > - arm64: qcom-sc7180-trogdor (not mainline yet)
> >
> > These are the devices I tested this series on.  I tried to test
> > various combinations of enabling/disabling various options and I
> > hopefully caught the corner cases, but I'd appreciate any extra
> > testing people can do.  Notably I didn't test on x86, but (I think) I
> > didn't touch much there so I shouldn't have broken anything.
>
> I have tested a slightly earlier version using qemu and will test this
> set before it moves forwards.
>
>
> >  .../admin-guide/kernel-parameters.txt         |  20 ++
> >  Documentation/dev-tools/kgdb.rst              |  24 ++
> >  arch/arm64/Kconfig                            |   1 +
> >  arch/arm64/include/asm/debug-monitors.h       |   2 +
> >  arch/arm64/kernel/debug-monitors.c            |   2 +-
> >  arch/arm64/kernel/traps.c                     |   3 +
> >  arch/x86/Kconfig                              |   1 +
> >  drivers/tty/serial/8250/8250_early.c          |  23 ++
> >  drivers/tty/serial/amba-pl011.c               |  32 +++
> >  drivers/tty/serial/kgdboc.c                   | 268 ++++++++++++++++--
> >  drivers/tty/serial/qcom_geni_serial.c         |  32 +++
> >  include/linux/kgdb.h                          |   4 +
> >  kernel/debug/debug_core.c                     |  52 +++-
> >  lib/Kconfig.kgdb                              |  18 ++
> >  14 files changed, 436 insertions(+), 46 deletions(-)
>
> Any thoughts on how best to land these changes?
>
> AFAICT the arm64

I was hoping to get an Ack from Will or Catalin for my most recent
arm64 patch [1] and then it could land in your tree.  However, it
wouldn't be the end of the world if that landed later.  "kgdbwait"
would be broken if you used it together with "kgdb_earlycon" but
overall we'd still be in a better place than we were.


> and 8250/amba-pl011/qcom_geni_serial code
> could be applied independently of the kgdb changes

Right, that would be OK.  Nobody would actually be able to use
"kgdb_earlycon" until those landed but there would be no problem with
those two landing separately.


> (though we must keep
> changes to drivers/tty/serial/kgdboc alongside the kgdb changes).
>
> I can hoover them up but I'd need a solid set of acks and
> I don't think we've got that yet.

It would be nice for it to be explicit, but "get_maintainer" says that
Greg KH is the maintainer of serial drivers.  Git log confirms that he
also has been the one landing changes to these files.  Early-on he
provided his Reviewed-by for the series as a whole, so he's aware of
it and maybe would be fine w/ the serial changes landing through the
kgdb tree?

Greg: is that correct?


> I'd also be happy to ack where needed and let someone else pick it up
> (the other changes queued for kgdb this cycle are pretty small so we
> shouldn't see much conflict in kernel/debug/ ).

It feels to me that the kgdb tree is the best destination for all
these patches if possible.


[1] https://lore.kernel.org/r/20200513160501.1.I0b5edf030cc6ebef6ab4829f8867cdaea42485d8@changeid

-Doug

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Re: [PATCH v4 00/12] kgdb: Support late serial drivers; enable early debug w/ boot consoles

[Greg Kroah-Hartman]

On Thu, May 14, 2020 at 09:34:26AM -0700, Doug Anderson wrote:
> > (though we must keep
> > changes to drivers/tty/serial/kgdboc alongside the kgdb changes).
> >
> > I can hoover them up but I'd need a solid set of acks and
> > I don't think we've got that yet.
> 
> It would be nice for it to be explicit, but "get_maintainer" says that
> Greg KH is the maintainer of serial drivers.  Git log confirms that he
> also has been the one landing changes to these files.  Early-on he
> provided his Reviewed-by for the series as a whole, so he's aware of
> it and maybe would be fine w/ the serial changes landing through the
> kgdb tree?
> 
> Greg: is that correct?

I have no objection for all of these to go through any other tree that
wants to take them :)

But if you want me to take them in the serial tree, to make it easier
for you or any other serial driver issues, I will be glad to do that,
just send them my way.  It's your call.

thanks,

greg k-h

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Re: [PATCH v4 00/12] kgdb: Support late serial drivers; enable early debug w/ boot consoles

[Daniel Thompson]

On Thu, May 07, 2020 at 01:08:38PM -0700, Douglas Anderson wrote:
> This whole pile of patches was motivated by me trying to get kgdb to
> work properly on a platform where my serial driver ended up being hit
> by the -EPROBE_DEFER virus (it wasn't practicing social distancing
> from other drivers).  Specifically my serial driver's parent device
> depended on a resource that wasn't available when its probe was first
> called.  It returned -EPROBE_DEFER which meant that when "kgdboc"
> tried to run its setup the serial driver wasn't there.  Unfortunately
> "kgdboc" never tried again, so that meant that kgdb was disabled until
> I manually enalbed it via sysfs.
> 
> <snip>
> 
> This series (and my comments / documentation / commit messages) are
> now long enough that my eyes glaze over when I try to read it all over
> to double-check.  I've nontheless tried to double-check it, but I'm
> pretty sure I did something stupid.  Thank you ahead of time for
> pointing it out to me so I can fix it in v5.  If somehow I managed to
> not do anything stupid (really?) then thank you for double-checking me
> anyway.

Applied (minus the arm64 specific stuff), should be in the next linux-next.


Daniel.

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Re: [PATCH v4 00/12] kgdb: Support late serial drivers; enable early debug w/ boot consoles

[Daniel Thompson]

On Thu, May 14, 2020 at 06:36:33PM +0200, Greg Kroah-Hartman wrote:
> On Thu, May 14, 2020 at 09:34:26AM -0700, Doug Anderson wrote:
> > > (though we must keep
> > > changes to drivers/tty/serial/kgdboc alongside the kgdb changes).
> > >
> > > I can hoover them up but I'd need a solid set of acks and
> > > I don't think we've got that yet.
> > 
> > It would be nice for it to be explicit, but "get_maintainer" says that
> > Greg KH is the maintainer of serial drivers.  Git log confirms that he
> > also has been the one landing changes to these files.  Early-on he
> > provided his Reviewed-by for the series as a whole, so he's aware of
> > it and maybe would be fine w/ the serial changes landing through the
> > kgdb tree?
> > 
> > Greg: is that correct?
> 
> I have no objection for all of these to go through any other tree that
> wants to take them :)
> 
> But if you want me to take them in the serial tree, to make it easier
> for you or any other serial driver issues, I will be glad to do that,
> just send them my way.  It's your call.

Thanks. I've taken then via my tree.


Daniel.

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