From: Vladimir Oltean <vladimir.oltean@nxp.com> Date: 2021-12-14 13:59:20
This reverts commit 869f0ec048dc8fd88c0b2003373bd985795179fb. That
updated the expected device tree binding format for the ls-extirq
driver, without also updating the parsing code (ls_extirq_parse_map)
to the new format.
The context is that the ls-extirq driver uses the standard
"interrupt-map" OF property in a non-standard way, as suggested by
Rob Herring during review:
https://lore.kernel.org/lkml/20190927161118.GA19333@bogus/
This has turned out to be problematic, as Marc Zyngier discovered
through commit 041284181226 ("of/irq: Allow matching of an interrupt-map
local to an interrupt controller"), later fixed through commit
de4adddcbcc2 ("of/irq: Add a quirk for controllers with their own
definition of interrupt-map"). Marc's position, expressed on multiple
opportunities, is that:
(a) [ making private use of the reserved "interrupt-map" name in a
driver ] "is wrong, by the very letter of what an interrupt-map
means. If the interrupt map points to an interrupt controller,
that's the target for the interrupt."
https://lore.kernel.org/lkml/87k0g8jlmg.wl-maz@kernel.org/
(b) [ updating the driver's bindings to accept a non-reserved name for
this property, as an alternative, is ] "is totally pointless. These
machines have been in the wild for years, and existing DTs will be
there *forever*."
https://lore.kernel.org/lkml/87ilvrk1r0.wl-maz@kernel.org/
Considering the above, the Linux kernel has quirks in place to deal with
the ls-extirq's non-standard use of the "interrupt-map". These quirks
may be needed in other operating systems that consume this device tree,
yet this is seen as the only viable solution.
Therefore, the premise of the patch being reverted here is invalid.
It doesn't matter whether the driver, in its non-standard use of the
property, complies to the standard format or not, since this property
isn't expected to be used for interrupt translation by the core.
This change restores LS1088A, LS2088A/LS2085A and LX2160A to their
previous bindings, which allows these systems to continue to use
external interrupt lines with the correct polarity.
Fixes: 869f0ec048dc ("arm64: dts: freescale: Fix 'interrupt-map' parent address cells")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
v1->v2: remove the other 9 patches that rename "interrupt-map" to
"fsl,extirq-map", at Marc's suggestion.
.../arm64/boot/dts/freescale/fsl-ls1088a.dtsi | 24 +++++++++----------
.../arm64/boot/dts/freescale/fsl-ls208xa.dtsi | 24 +++++++++----------
.../arm64/boot/dts/freescale/fsl-lx2160a.dtsi | 24 +++++++++----------
3 files changed, 36 insertions(+), 36 deletions(-)
From: Vladimir Oltean <vladimir.oltean@nxp.com> Date: 2021-12-31 18:13:59
Hello,
On Tue, Dec 14, 2021 at 03:58:52PM +0200, Vladimir Oltean wrote:
This reverts commit 869f0ec048dc8fd88c0b2003373bd985795179fb. That
updated the expected device tree binding format for the ls-extirq
driver, without also updating the parsing code (ls_extirq_parse_map)
to the new format.
The context is that the ls-extirq driver uses the standard
"interrupt-map" OF property in a non-standard way, as suggested by
Rob Herring during review:
https://lore.kernel.org/lkml/20190927161118.GA19333@bogus/
This has turned out to be problematic, as Marc Zyngier discovered
through commit 041284181226 ("of/irq: Allow matching of an interrupt-map
local to an interrupt controller"), later fixed through commit
de4adddcbcc2 ("of/irq: Add a quirk for controllers with their own
definition of interrupt-map"). Marc's position, expressed on multiple
opportunities, is that:
(a) [ making private use of the reserved "interrupt-map" name in a
driver ] "is wrong, by the very letter of what an interrupt-map
means. If the interrupt map points to an interrupt controller,
that's the target for the interrupt."
https://lore.kernel.org/lkml/87k0g8jlmg.wl-maz@kernel.org/
(b) [ updating the driver's bindings to accept a non-reserved name for
this property, as an alternative, is ] "is totally pointless. These
machines have been in the wild for years, and existing DTs will be
there *forever*."
https://lore.kernel.org/lkml/87ilvrk1r0.wl-maz@kernel.org/
Considering the above, the Linux kernel has quirks in place to deal with
the ls-extirq's non-standard use of the "interrupt-map". These quirks
may be needed in other operating systems that consume this device tree,
yet this is seen as the only viable solution.
Therefore, the premise of the patch being reverted here is invalid.
It doesn't matter whether the driver, in its non-standard use of the
property, complies to the standard format or not, since this property
isn't expected to be used for interrupt translation by the core.
This change restores LS1088A, LS2088A/LS2085A and LX2160A to their
previous bindings, which allows these systems to continue to use
external interrupt lines with the correct polarity.
Fixes: 869f0ec048dc ("arm64: dts: freescale: Fix 'interrupt-map' parent address cells")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
v1->v2: remove the other 9 patches that rename "interrupt-map" to
"fsl,extirq-map", at Marc's suggestion.
Could this patch be considered for merging in v5.16? The problem is
going to be quite a bit more severe and tricky to fix otherwise. Thanks.
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From: Marc Zyngier <maz@kernel.org> Date: 2022-01-02 13:08:37
On 2021-12-31 18:13, Vladimir Oltean wrote:
Hello,
On Tue, Dec 14, 2021 at 03:58:52PM +0200, Vladimir Oltean wrote:
quoted
This reverts commit 869f0ec048dc8fd88c0b2003373bd985795179fb. That
updated the expected device tree binding format for the ls-extirq
driver, without also updating the parsing code (ls_extirq_parse_map)
to the new format.
The context is that the ls-extirq driver uses the standard
"interrupt-map" OF property in a non-standard way, as suggested by
Rob Herring during review:
https://lore.kernel.org/lkml/20190927161118.GA19333@bogus/
This has turned out to be problematic, as Marc Zyngier discovered
through commit 041284181226 ("of/irq: Allow matching of an
interrupt-map
local to an interrupt controller"), later fixed through commit
de4adddcbcc2 ("of/irq: Add a quirk for controllers with their own
definition of interrupt-map"). Marc's position, expressed on multiple
opportunities, is that:
(a) [ making private use of the reserved "interrupt-map" name in a
driver ] "is wrong, by the very letter of what an interrupt-map
means. If the interrupt map points to an interrupt controller,
that's the target for the interrupt."
https://lore.kernel.org/lkml/87k0g8jlmg.wl-maz@kernel.org/
(b) [ updating the driver's bindings to accept a non-reserved name for
this property, as an alternative, is ] "is totally pointless.
These
machines have been in the wild for years, and existing DTs will be
there *forever*."
https://lore.kernel.org/lkml/87ilvrk1r0.wl-maz@kernel.org/
Considering the above, the Linux kernel has quirks in place to deal
with
the ls-extirq's non-standard use of the "interrupt-map". These quirks
may be needed in other operating systems that consume this device
tree,
yet this is seen as the only viable solution.
Therefore, the premise of the patch being reverted here is invalid.
It doesn't matter whether the driver, in its non-standard use of the
property, complies to the standard format or not, since this property
isn't expected to be used for interrupt translation by the core.
This change restores LS1088A, LS2088A/LS2085A and LX2160A to their
previous bindings, which allows these systems to continue to use
external interrupt lines with the correct polarity.
Fixes: 869f0ec048dc ("arm64: dts: freescale: Fix 'interrupt-map'
parent address cells")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
v1->v2: remove the other 9 patches that rename "interrupt-map" to
"fsl,extirq-map", at Marc's suggestion.
Could this patch be considered for merging in v5.16? The problem is
going to be quite a bit more severe and tricky to fix otherwise.
Thanks.
FWIW:
Acked-by: Marc Zyngier <maz@kernel.org>
Rob, Shawn, can you please queue this as an urgent fix for 5.16?
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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On Sun, Jan 02, 2022 at 01:08:28PM +0000, Marc Zyngier wrote:
On 2021-12-31 18:13, Vladimir Oltean wrote:
quoted
Hello,
On Tue, Dec 14, 2021 at 03:58:52PM +0200, Vladimir Oltean wrote:
quoted
This reverts commit 869f0ec048dc8fd88c0b2003373bd985795179fb. That
updated the expected device tree binding format for the ls-extirq
driver, without also updating the parsing code (ls_extirq_parse_map)
to the new format.
The context is that the ls-extirq driver uses the standard
"interrupt-map" OF property in a non-standard way, as suggested by
Rob Herring during review:
https://lore.kernel.org/lkml/20190927161118.GA19333@bogus/
This has turned out to be problematic, as Marc Zyngier discovered
through commit 041284181226 ("of/irq: Allow matching of an
interrupt-map
local to an interrupt controller"), later fixed through commit
de4adddcbcc2 ("of/irq: Add a quirk for controllers with their own
definition of interrupt-map"). Marc's position, expressed on multiple
opportunities, is that:
(a) [ making private use of the reserved "interrupt-map" name in a
driver ] "is wrong, by the very letter of what an interrupt-map
means. If the interrupt map points to an interrupt controller,
that's the target for the interrupt."
https://lore.kernel.org/lkml/87k0g8jlmg.wl-maz@kernel.org/
(b) [ updating the driver's bindings to accept a non-reserved name for
this property, as an alternative, is ] "is totally pointless.
These
machines have been in the wild for years, and existing DTs will be
there *forever*."
https://lore.kernel.org/lkml/87ilvrk1r0.wl-maz@kernel.org/
Considering the above, the Linux kernel has quirks in place to deal
with
the ls-extirq's non-standard use of the "interrupt-map". These quirks
may be needed in other operating systems that consume this device
tree,
yet this is seen as the only viable solution.
Therefore, the premise of the patch being reverted here is invalid.
It doesn't matter whether the driver, in its non-standard use of the
property, complies to the standard format or not, since this property
isn't expected to be used for interrupt translation by the core.
This change restores LS1088A, LS2088A/LS2085A and LX2160A to their
previous bindings, which allows these systems to continue to use
external interrupt lines with the correct polarity.
Fixes: 869f0ec048dc ("arm64: dts: freescale: Fix 'interrupt-map'
parent address cells")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
v1->v2: remove the other 9 patches that rename "interrupt-map" to
"fsl,extirq-map", at Marc's suggestion.
Could this patch be considered for merging in v5.16? The problem is
going to be quite a bit more severe and tricky to fix otherwise. Thanks.
FWIW:
Acked-by: Marc Zyngier <maz@kernel.org>
Rob, Shawn, can you please queue this as an urgent fix for 5.16?
I would rather leave this to Rob, as I haven't heard anything from him
on this reverting (on his commit).
Shawn
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On Mon, Jan 03, 2022 at 07:30:44PM +0800, Shawn Guo wrote:
On Sun, Jan 02, 2022 at 01:08:28PM +0000, Marc Zyngier wrote:
quoted
On 2021-12-31 18:13, Vladimir Oltean wrote:
quoted
Hello,
On Tue, Dec 14, 2021 at 03:58:52PM +0200, Vladimir Oltean wrote:
quoted
This reverts commit 869f0ec048dc8fd88c0b2003373bd985795179fb. That
updated the expected device tree binding format for the ls-extirq
driver, without also updating the parsing code (ls_extirq_parse_map)
to the new format.
The context is that the ls-extirq driver uses the standard
"interrupt-map" OF property in a non-standard way, as suggested by
Rob Herring during review:
https://lore.kernel.org/lkml/20190927161118.GA19333@bogus/
This has turned out to be problematic, as Marc Zyngier discovered
through commit 041284181226 ("of/irq: Allow matching of an
interrupt-map
local to an interrupt controller"), later fixed through commit
de4adddcbcc2 ("of/irq: Add a quirk for controllers with their own
definition of interrupt-map"). Marc's position, expressed on multiple
opportunities, is that:
(a) [ making private use of the reserved "interrupt-map" name in a
driver ] "is wrong, by the very letter of what an interrupt-map
means. If the interrupt map points to an interrupt controller,
that's the target for the interrupt."
https://lore.kernel.org/lkml/87k0g8jlmg.wl-maz@kernel.org/
(b) [ updating the driver's bindings to accept a non-reserved name for
this property, as an alternative, is ] "is totally pointless.
These
machines have been in the wild for years, and existing DTs will be
there *forever*."
https://lore.kernel.org/lkml/87ilvrk1r0.wl-maz@kernel.org/
Considering the above, the Linux kernel has quirks in place to deal
with
the ls-extirq's non-standard use of the "interrupt-map". These quirks
may be needed in other operating systems that consume this device
tree,
yet this is seen as the only viable solution.
Therefore, the premise of the patch being reverted here is invalid.
It doesn't matter whether the driver, in its non-standard use of the
property, complies to the standard format or not, since this property
isn't expected to be used for interrupt translation by the core.
This change restores LS1088A, LS2088A/LS2085A and LX2160A to their
previous bindings, which allows these systems to continue to use
external interrupt lines with the correct polarity.
Fixes: 869f0ec048dc ("arm64: dts: freescale: Fix 'interrupt-map'
parent address cells")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
v1->v2: remove the other 9 patches that rename "interrupt-map" to
"fsl,extirq-map", at Marc's suggestion.
Could this patch be considered for merging in v5.16? The problem is
going to be quite a bit more severe and tricky to fix otherwise. Thanks.
FWIW:
Acked-by: Marc Zyngier <maz@kernel.org>
Rob, Shawn, can you please queue this as an urgent fix for 5.16?
I would rather leave this to Rob, as I haven't heard anything from him
on this reverting (on his commit).
Could this patch be queued up as a fix for v5.16 and v5.17?
Ioana
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From: Vladimir Oltean <vladimir.oltean@nxp.com> Date: 2022-03-10 20:09:32
Hello Rob,
On Wed, Feb 09, 2022 at 11:54:35AM +0000, Ioana Ciornei wrote:
On Mon, Jan 03, 2022 at 07:30:44PM +0800, Shawn Guo wrote:
quoted
On Sun, Jan 02, 2022 at 01:08:28PM +0000, Marc Zyngier wrote:
quoted
On 2021-12-31 18:13, Vladimir Oltean wrote:
quoted
Hello,
On Tue, Dec 14, 2021 at 03:58:52PM +0200, Vladimir Oltean wrote:
quoted
This reverts commit 869f0ec048dc8fd88c0b2003373bd985795179fb. That
updated the expected device tree binding format for the ls-extirq
driver, without also updating the parsing code (ls_extirq_parse_map)
to the new format.
The context is that the ls-extirq driver uses the standard
"interrupt-map" OF property in a non-standard way, as suggested by
Rob Herring during review:
https://lore.kernel.org/lkml/20190927161118.GA19333@bogus/
This has turned out to be problematic, as Marc Zyngier discovered
through commit 041284181226 ("of/irq: Allow matching of an
interrupt-map
local to an interrupt controller"), later fixed through commit
de4adddcbcc2 ("of/irq: Add a quirk for controllers with their own
definition of interrupt-map"). Marc's position, expressed on multiple
opportunities, is that:
(a) [ making private use of the reserved "interrupt-map" name in a
driver ] "is wrong, by the very letter of what an interrupt-map
means. If the interrupt map points to an interrupt controller,
that's the target for the interrupt."
https://lore.kernel.org/lkml/87k0g8jlmg.wl-maz@kernel.org/
(b) [ updating the driver's bindings to accept a non-reserved name for
this property, as an alternative, is ] "is totally pointless.
These
machines have been in the wild for years, and existing DTs will be
there *forever*."
https://lore.kernel.org/lkml/87ilvrk1r0.wl-maz@kernel.org/
Considering the above, the Linux kernel has quirks in place to deal
with
the ls-extirq's non-standard use of the "interrupt-map". These quirks
may be needed in other operating systems that consume this device
tree,
yet this is seen as the only viable solution.
Therefore, the premise of the patch being reverted here is invalid.
It doesn't matter whether the driver, in its non-standard use of the
property, complies to the standard format or not, since this property
isn't expected to be used for interrupt translation by the core.
This change restores LS1088A, LS2088A/LS2085A and LX2160A to their
previous bindings, which allows these systems to continue to use
external interrupt lines with the correct polarity.
Fixes: 869f0ec048dc ("arm64: dts: freescale: Fix 'interrupt-map'
parent address cells")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
v1->v2: remove the other 9 patches that rename "interrupt-map" to
"fsl,extirq-map", at Marc's suggestion.
Could this patch be considered for merging in v5.16? The problem is
going to be quite a bit more severe and tricky to fix otherwise. Thanks.
FWIW:
Acked-by: Marc Zyngier <maz@kernel.org>
Rob, Shawn, can you please queue this as an urgent fix for 5.16?
I would rather leave this to Rob, as I haven't heard anything from him
on this reverting (on his commit).
Could this patch be queued up as a fix for v5.16 and v5.17?
Ioana
This is a reminder that interrupts through the fsl-extirq driver are
still broken. Not to mention that we aren't even in the same release
cycle as the patch that introduced the breakage anymore, so broken
device trees (or "syntactically correct", depending on how you wish to
see it) have already started circulating. Do you have a better
suggestion to fix this?
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From: Rob Herring <robh+dt@kernel.org> Date: 2022-03-14 15:15:35
On Tue, Dec 14, 2021 at 6:59 AM Vladimir Oltean [off-list ref] wrote:
This reverts commit 869f0ec048dc8fd88c0b2003373bd985795179fb. That
updated the expected device tree binding format for the ls-extirq
driver, without also updating the parsing code (ls_extirq_parse_map)
to the new format.
Sorry, I missed this until mentioned on IRC.
The context is that the ls-extirq driver uses the standard
"interrupt-map" OF property in a non-standard way, as suggested by
Rob Herring during review:
https://lore.kernel.org/lkml/20190927161118.GA19333@bogus/
This has turned out to be problematic, as Marc Zyngier discovered
through commit 041284181226 ("of/irq: Allow matching of an interrupt-map
local to an interrupt controller"), later fixed through commit
de4adddcbcc2 ("of/irq: Add a quirk for controllers with their own
definition of interrupt-map"). Marc's position, expressed on multiple
opportunities, is that:
(a) [ making private use of the reserved "interrupt-map" name in a
driver ] "is wrong, by the very letter of what an interrupt-map
means. If the interrupt map points to an interrupt controller,
that's the target for the interrupt."
https://lore.kernel.org/lkml/87k0g8jlmg.wl-maz@kernel.org/
(b) [ updating the driver's bindings to accept a non-reserved name for
this property, as an alternative, is ] "is totally pointless. These
machines have been in the wild for years, and existing DTs will be
there *forever*."
https://lore.kernel.org/lkml/87ilvrk1r0.wl-maz@kernel.org/
Considering the above, the Linux kernel has quirks in place to deal with
the ls-extirq's non-standard use of the "interrupt-map". These quirks
may be needed in other operating systems that consume this device tree,
yet this is seen as the only viable solution.
Therefore, the premise of the patch being reverted here is invalid.
It doesn't matter whether the driver, in its non-standard use of the
property, complies to the standard format or not, since this property
isn't expected to be used for interrupt translation by the core.
I disagree. The non-standard part is that 'interrupt-map' translation
is not transparent. 'interrupt-map' that can't be parsed in the
standard way is just wrong, and I imagine was never the intention
here. We simply cannot have platforms defining their own format for
standard properties.
Reverting this will cause dtc warnings now (IIRC) and just kicks the
can down the road. Reverting is fine for now (I gave Arnd the okay on
IRC), but I think the parsing will need to be updated to honor
#address-cells and detect an old DT (probably by looking at the total
size of 'interrupt-map') and mark that change for stable. That would
only leave a new dt with an old kernel without stable updates broken.
Seems unlikely a device is getting firmware updates, but not OS
updates.
Rob
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From: Marc Zyngier <maz@kernel.org> Date: 2022-03-14 15:34:42
On Mon, 14 Mar 2022 15:15:15 +0000,
Rob Herring [off-list ref] wrote:
On Tue, Dec 14, 2021 at 6:59 AM Vladimir Oltean [off-list ref] wrote:
quoted
Therefore, the premise of the patch being reverted here is invalid.
It doesn't matter whether the driver, in its non-standard use of the
property, complies to the standard format or not, since this property
isn't expected to be used for interrupt translation by the core.
I disagree. The non-standard part is that 'interrupt-map' translation
is not transparent. 'interrupt-map' that can't be parsed in the
standard way is just wrong, and I imagine was never the intention
here. We simply cannot have platforms defining their own format for
standard properties.
That ship sailed a long while ago. We have a list of offenders, and we
can make sure we don't get additional ones.
Reverting this will cause dtc warnings now (IIRC) and just kicks the
can down the road. Reverting is fine for now (I gave Arnd the okay on
IRC), but I think the parsing will need to be updated to honor
#address-cells and detect an old DT (probably by looking at the total
size of 'interrupt-map') and mark that change for stable. That would
only leave a new dt with an old kernel without stable updates broken.
Seems unlikely a device is getting firmware updates, but not OS
updates.
Being able to rollback firmware and OS independently is important. The
tooling can be taught about the broken instances, which should be
enough. Adding to the parsing only makes things harder to maintain,
for no real gain.
M.
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From: Rob Herring <robh+dt@kernel.org> Date: 2022-03-14 16:08:57
On Mon, Mar 14, 2022 at 9:34 AM Marc Zyngier [off-list ref] wrote:
On Mon, 14 Mar 2022 15:15:15 +0000,
Rob Herring [off-list ref] wrote:
quoted
On Tue, Dec 14, 2021 at 6:59 AM Vladimir Oltean [off-list ref] wrote:
quoted
Therefore, the premise of the patch being reverted here is invalid.
It doesn't matter whether the driver, in its non-standard use of the
property, complies to the standard format or not, since this property
isn't expected to be used for interrupt translation by the core.
I disagree. The non-standard part is that 'interrupt-map' translation
is not transparent. 'interrupt-map' that can't be parsed in the
standard way is just wrong, and I imagine was never the intention
here. We simply cannot have platforms defining their own format for
standard properties.
That ship sailed a long while ago. We have a list of offenders, and we
can make sure we don't get additional ones.
quoted
Reverting this will cause dtc warnings now (IIRC) and just kicks the
can down the road. Reverting is fine for now (I gave Arnd the okay on
IRC), but I think the parsing will need to be updated to honor
#address-cells and detect an old DT (probably by looking at the total
size of 'interrupt-map') and mark that change for stable. That would
only leave a new dt with an old kernel without stable updates broken.
Seems unlikely a device is getting firmware updates, but not OS
updates.
Being able to rollback firmware and OS independently is important. The
tooling can be taught about the broken instances, which should be
enough. Adding to the parsing only makes things harder to maintain,
for no real gain.
It's up to individual platforms to care about that. If they don't,
then compatibility has been broken multiple times most certainly
because in general there is 0 testing for it. Why make our lives more
complicated in those cases?
Rob
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