Re: [PATCH v11 11/16] iommu/arm-smmu-v3: Add CMDQ_PROD_STOP_FLAG to gate CMDQ submissions

[Pranjal Shrivastava]

On Wed, Oct 07, 2026 at 03:08:01PM +0100, Will Deacon wrote:
> On Tue, Sep 29, 2026 at 03:45:05AM +0000, Pranjal Shrivastava wrote:
> > Introduce a new bit flag, CMDQ_PROD_STOP_FLAG (bit 30), in the command
> > queue's producer index to safely gate command submissions during device
> > suspension.
> > 
> > The flag embeds the suspend state directly into the existing global state
> > The flag is checked in the cmpxchg loop in arm_smmu_cmdq_issue_cmdlist(),
> > which acts as a Point of Commitment, ensuring that no indices are
> > reserved or committed once the SMMU begins suspending.
> 
> I'm not familiar with the term "Point of Commitment". Is that something
> you came up with? Without a general definition, I think I'd prefer to
> avoid using it, especially as it sounds like something to do with the
> Arm memory system (where we already have architectural terms such as
> "Point of Coherency".
>  

Ack. I'll re-word this to avoid confusion.

Thanks,
Praan