Re: [PATCH v4 5/6] iova: Add iova_len argument to init_iova_domain()

From: John Garry
Date: Mon Aug 02 2021 - 12:41:22 EST

On 02/08/2021 17:16, Robin Murphy wrote:
On 2021-08-02 17:06, John Garry wrote:
On 02/08/2021 16:06, Will Deacon wrote:
On Wed, Jul 14, 2021 at 06:36:42PM +0800, John Garry wrote:
Add max opt argument to init_iova_domain(), and use it to set the rcaches

Also fix up all users to set this value (at 0, meaning use default).
Wrap that in init_iova_domain_defaults() to avoid the mysterious 0?

Sure, I can do something like that. I actually did have separate along those lines in v3 before I decided to change it.

Y'know, at this point I'm now starting to seriously wonder whether moving the rcaches into iommu_dma_cookie wouldn't make a whole lot of things simpler... :/

As I see, the rcache stuff isn't really specific to IOVA anyway, so it seems sane.

Does that sound like crazy talk to you, or an idea worth entertaining?

If you're going to start moving things, has anyone considered putting rcache support in lib as a generic solution to "Magazines and Vmem: .." paper?