> -Original Message-
> From: Song Bao Hua (Barry Song)
> Sent: Friday, July 17, 2020 9:06 PM
> To: 'Robin Murphy' ; w...@kernel.org;
> j...@8bytes.org
> Cc: linux-kernel@vger.kernel.org; Linuxarm ;
> linux-arm-ker...@lists.infradead.org; io...@lists.linux-foundation.org;
> Zengtao (B)
>
> -Original Message-
> From: Robin Murphy [mailto:robin.mur...@arm.com]
> Sent: Friday, July 17, 2020 8:55 PM
> To: Song Bao Hua (Barry Song) ; w...@kernel.org;
> j...@8bytes.org
> Cc: linux-kernel@vger.kernel.org; Linuxarm ;
> linux-arm-ker...@lists.infradead.org;
On 2020-07-17 00:07, Barry Song wrote:
Before commit 587e6c10a7ce ("iommu/arm-smmu-v3: Reduce contention during
command-queue insertion"), msi polling perhaps performed better since
it could run outside the spin_lock_irqsave() while the code polling cons
reg was running in the lock.
But after
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