lib_manager: Add cache writeback after library loading to IMR#10309
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kv2019i merged 1 commit intothesofproject:mainfrom Oct 17, 2025
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tmleman
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Pull Request Overview
This PR fixes a cache coherency issue in multicore scenarios where libraries loaded into IMR (Isolated Memory Region) by one core are not visible to other cores, causing crashes and errors on Intel MTL, LNL, PTL, and NVL platforms.
Key Changes:
- Added cache writeback operation after copying the library manifest to IMR
- Added cache writeback operation after copying the complete library data to IMR
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Add dcache_writeback_region() call after copying library data to IMR (Isolated Memory Region) to ensure cache coherency in multicore scenarios. Without this cache operation, when Core 0 loads a library into IMR via memcpy_s(), the data remains in Core 0's data cache and is not written back to main memory. When Core 1 later tries to create a module from this library, it reads uninitialized or stale data from IMR, causing either: - "Unsupported module API version" errors (reading garbage build info) - Fatal PIF data errors and crashes (accessing corrupted module data) The fix adds a single cache writeback operation after all library data (manifest + module code/data) has been copied to IMR. This ensures library data written by Core 0 is flushed from cache to IMR memory before Core 1 attempts to read it, following the standard cache coherency protocol for non-coherent Harvard architecture (Xtensa). Fixes multicore topology crashes on Intel MTL, LNL, PTL, NVL platforms when loading external libraries with modules instantiated on secondary cores. Signed-off-by: Tomasz Leman <tomasz.m.leman@intel.com>
lyakh
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alright... My only question is - why aren't Jenkins multicore nocodec tests failing left and right?..
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| /* Writeback entire library to ensure it's visible to other cores */ | ||
| dcache_writeback_region((__sparse_force void *)library_base_address, preload_size); |
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do we continue using this API or should we gradually switch over to calling sys_cache_data_flush_range() directly?
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Add dcache_writeback_region() calls after copying library data to IMR (Isolated Memory Region) to ensure cache coherency in multicore scenarios.
Without these cache operations, when Core 0 loads a library into IMR via memcpy_s(), the data remains in Core 0's data cache and is not written back to main memory. When Core 1 later tries to create a module from this library, it reads uninitialized or stale data from IMR, causing either:
The fix adds cache writeback operations at two critical points:
This ensures library data written by Core 0 is flushed from cache to IMR memory before Core 1 attempts to read it, following the standard cache coherency protocol for non-coherent Harvard architecture (Xtensa).
Fixes multicore topology crashes on Intel MTL, LNL, PTL, NVL platforms when loading external libraries with modules instantiated on secondary cores.