FROMLIST: of: parsing of multi #{iommu,msi}-cells in maps#445
Open
vijayanandjitta-oss wants to merge 3 commits intoqualcomm-linux:qcom-6.18.yfrom
Open
FROMLIST: of: parsing of multi #{iommu,msi}-cells in maps#445vijayanandjitta-oss wants to merge 3 commits intoqualcomm-linux:qcom-6.18.yfrom
vijayanandjitta-oss wants to merge 3 commits intoqualcomm-linux:qcom-6.18.yfrom
Conversation
shashim-quic
requested changes
Apr 9, 2026
shashim-quic
left a comment
shashim-quic
left a comment
There was a problem hiding this comment.
Add CRs-Fixed: to your PR description.
Make sure mainline component is associate in CR with change. This is to enforce mainline first policy.
Till this is not done and qcom-6.18.y-check is failing. PR will not merge. So please take care of this. |
Author
Done |
You didn;t associate mainline component with the change. |
Author
|
=
Done. Have added it now . |
Since we now have quite a few users parsing "iommu-map" and "msi-map" properties, give them some wrappers to conveniently encapsulate the appropriate sets of property names. This will also make it easier to then change of_map_id() to correctly account for specifier cells. Link: https://lore.kernel.org/all/[email protected]/ Reviewed-by: Rob Herring (Arm) <[email protected]> Reviewed-by: Frank Li <[email protected]> Acked-by: Marc Zyngier <[email protected]> Acked-by: Bjorn Helgaas <[email protected]> Signed-off-by: Robin Murphy <[email protected]> [Conflict: irq-gic-its-msi-parent.c was refactored to split of_pmsi_get_msi_info() into of_pmsi_get_dev_id() and of_v5_pmsi_get_msi_info(); updated both of_map_id() calls.] Signed-off-by: Vijayanand Jitta <[email protected]>
Change of_map_id() to take a pointer to struct of_phandle_args instead of passing target device node and translated IDs separately. Update all callers accordingly. Add an explicit filter_np parameter to of_map_id() and of_map_msi_id() to separate the filter input from the output. Previously, the target parameter served dual purpose: as an input filter (if non-NULL, only match entries targeting that node) and as an output (receiving the matched node with a reference held). Now filter_np is the explicit input filter and arg->np is the pure output. Previously, of_map_id() would call of_node_put() on the matched node when a filter was provided, making reference ownership inconsistent. Remove this internal of_node_put() call so that of_map_id() now always transfers ownership of the matched node reference to the caller via arg->np. Callers are now consistently responsible for releasing this reference with of_node_put(arg->np) when done. Link: https://lore.kernel.org/all/[email protected]/ Acked-by: Frank Li <[email protected]> Suggested-by: Rob Herring (Arm) <[email protected]> Suggested-by: Dmitry Baryshkov <[email protected]> Signed-off-by: Charan Teja Kalla <[email protected]> [Conflict: irq-gic-its-msi-parent.c was refactored to split of_pmsi_get_msi_info() into of_pmsi_get_dev_id() and of_v5_pmsi_get_msi_info(); updated both of_map_id() calls.] Signed-off-by: Vijayanand Jitta <[email protected]>
So far our parsing of {iommu,msi}-map properties has always blindly
assumed that the output specifiers will always have exactly 1 cell.
This typically does happen to be the case, but is not actually enforced
(and the PCI msi-map binding even explicitly states support for 0 or 1
cells) - as a result we've now ended up with dodgy DTs out in the field
which depend on this behaviour to map a 1-cell specifier for a 2-cell
provider, despite that being bogus per the bindings themselves.
Since there is some potential use in being able to map at least single
input IDs to multi-cell output specifiers (and properly support 0-cell
outputs as well), add support for properly parsing and using the target
nodes' #cells values, albeit with the unfortunate complication of still
having to work around expectations of the old behaviour too.
Since there are multi-cell output specifiers, the callers of of_map_id()
may need to get the exact cell output value for further processing.
Update of_map_id() to set args_count in the output to reflect the actual
number of output specifier cells.
Link: https://lore.kernel.org/all/[email protected]/
Signed-off-by: Robin Murphy <[email protected]>
Signed-off-by: Charan Teja Kalla <[email protected]>
Signed-off-by: Vijayanand Jitta <[email protected]>
vijayanandjitta-oss
force-pushed
the
qcom-6.18/iommu-map-cells
branch
from
b7d3a22 to
374c98d
Compare
shashim-quic
approved these changes
Apr 10, 2026
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
4 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
This series adds #{iommu,msi}-cells support in maps .
So far our parsing of {iommu,msi}-map properties has always blindly
assumed that the output specifiers will always have exactly 1 cell.
This typically does happen to be the case, but is not actually enforced
(and the PCI msi-map binding even explicitly states support for 0 or 1
cells) - as a result we've now ended up with dodgy DTs out in the field
which depend on this behaviour to map a 1-cell specifier for a 2-cell
provider, despite that being bogus per the bindings themselves.
Since there is some potential use[1] in being able to map at least
single input IDs to multi-cell output specifiers (and properly support
0-cell outputs as well), add support for properly parsing and using the
target nodes' #cells values, albeit with the unfortunate complication of
still having to work around expectations of the old behaviour too.
-- Robin.
Unlike single #{}-cell, it is complex to establish a linear relation
between input 'id' and output specifier for multi-cell properties, thus
it is always expected that len never going to be > 1.
[1] https://lore.kernel.org/all/[email protected]/
[2] PR for iommu-map dtschema: devicetree-org/dt-schema#184
Link: https://lore.kernel.org/all/[email protected]/
CRs-Fixed: 4496236