On 9/30/26 11:38 AM, Trevor Gamblin wrote:
Create a new function to help match RISC-V ISA extension combinations
against recognized profile strings (e.g. 'rva22u64'), so that we can use
simpler patterns for naming things like sstate/build paths.
Signed-off-by: Trevor Gamblin <[email protected]>
---
meta/lib/oe/tune.py | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/meta/lib/oe/tune.py b/meta/lib/oe/tune.py
index 7296f39e66..0d8e4417e7 100644
--- a/meta/lib/oe/tune.py
+++ b/meta/lib/oe/tune.py
@@ -90,3 +90,32 @@ def riscv_isa_to_tune(isa):
# Eliminate duplicates, but preserve the order
feature = list(dict.fromkeys(feature))
return ' '.join(feature)
+
+# riscv_pkgarch(features, exact_pkgarch)
+#
+# Prefer a RISCV_PROFILES name (plus any extensions enabled on top of it) as
the
+# package arch fragment, since otherwise the full ISA extension list will
exceed
+# what the sstate class can handle. When several profiles match, the one with
+# the most extensions is preferred, as it is the more specific/clearer match.
+# If there's no clear profile matching the extension list, then fall back to
+# exact_pkgarch.
+def riscv_pkgarch(features, exact_pkgarch):
+ if not features:
+ return exact_pkgarch
+
+ current = set(features.split())
+
+ best_match = None
+ best_features = None
+ for name in RISCV_PROFILES:
Where is 'RISCV_PROFILES' defined?
As long as someone is willing to keep this up to date with all of the new
profiles, I don't have a concern with it.
On my AMD platforms, we have dynamic (user defined) ISA for our parts, the users
don't really use 'profiles', but select individual isa components. I would LIKE
(but only because it's easier for me) a way to see the ISA and not have it
converted back to a profile. However, if profiles are the risc-v ISA standard,
I'm fine without a way to disable the translation.
--Mark
+ profile_features = set(riscv_isa_to_tune(name).split())
+ if profile_features.issubset(current):
+ if best_features is None or len(profile_features) >
len(best_features):
+ best_match = name
+ best_features = profile_features
+
+ if best_match is None:
+ return exact_pkgarch
+
+ extra = sorted(current - best_features)
+ return '_'.join([best_match] + extra)
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