[PATCH 1/6] accel/ivpu: Add missing locks around mmu queues

[Jacek Lawrynowicz]

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 at intel.com>
>>
>> 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