Re: [PATCH v10 3/7] drm/tyr: add Memory Management Unit (MMU) support

[Deborah Brouwer <deborah.brouwer@collabora.com>]

On Tue, Jul 28, 2026 at 09:31:50PM +0200, Danilo Krummrich wrote:
> On Tue Jul 28, 2026 at 8:39 PM CEST, Deborah Brouwer wrote:
> > +/// Locked wrapper for carrying out virtual memory (VM) operations on the MMU.
> > +#[pin_data]
> > +pub(crate) struct Mmu<'drm> {
> 
> This shouldn't be 'drm, but 'mmu or just something generic like 'a.
> 
> The rationale is that Mmu might be shorter lived than 'drm once we have
> self-referencial pin-init. Currently it is straight forward, such as in
> 
> 	struct Foo<'foo> {
> 	    dev: &'foo platform::Device<Bound>,
> 	}
> 	
> 	struct Data<'bound> {
> 	    foo: Foo<'bound>,
> 	}
> 
> where the lifetime of `dev` really ties back to 'bound. However, with
> self-referencial pin-init it could looks like this:
> 
> 	struct Foo<'foo> {
> 	    dev: &'foo platform::Device<Bound>,
> 	    io: &'foo IoMem<'foo>,
> 	}
> 	
> 	struct Data<'bound> {
> 	    foo: Foo<'io>,
> 	    io: IoMem<'bound>,
> 	}
> 
> Now Foo is not constrained to 'bound anymore, as this would be longer lived than
> `io`, so it has to capture 'io instead in order to still compile.

Danilo, would you be ok with renaming this lifetime as a follow up
patch? Currently, if I understand this correctly, the mmu lifetime is
still tied to the DRM registration data, so the name is not inaccurate
for Tyr at least as it stands right now.