Hi Hari,
From: "ext Kanigeri, Hari" <[email protected]>
Subject: RE: [PATCH 1/6] omap iommu: tlb and pagetable primitives
Date: Tue, 5 May 2009 22:19:55 +0200
> Hi Doyu-san,
>
> +static void iotlb_lock_set(struct iommu *obj, struct iotlb_lock *l) {
> + u32 val;
> +
> + BUG_ON(l->base != 0); /* Currently no preservation is used */
>
> -- Did you notice any issues in the IOMMU driver by enabling the
> preservation?
>
> Bridge driver is locking the memory segment that is used for IPC in
> the TLB and by not having the preservation we might see a hit in the
> performance.
The current user of this driver is "camera isp" and no need for tlb
preservation for it, but it's on todo list for other clients.
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