Hi, On 2/14/2025 5:41 PM, Jeffrey Hugo wrote: > On 2/4/2025 1:46 AM, Jacek Lawrynowicz wrote: >> From: Andrzej Kacprowski <Andrzej.Kacprowski@xxxxxxxxx> >> >> Multiple threads were accessing mmu cmd queue simultaneously >> causing sporadic failures in ivpu_mmu_cmdq_sync() function. >> Protect critical code with mmu mutex. > > Describe a scenario in which this can occur? The two functions this patch modify cannot run concurrently from what I can tell. Functions from this diff are called in bottom IRQ handler when memory faults are detected. The CMDQ is also accessed from IOCTLs when mapping/unmapping buffers in NPU MMU (ivpu_mmu_invalidate_tlb()). Jacek
