On Tue, Aug 9, 2022 at 7:07 PM Elliot Berman [off-list ref] wrote:
On 8/9/2022 6:13 AM, Robin Murphy wrote:
quoted
[drive-by observation since one thing caught my interest...] >
Appreciate all the comments.
Jassi,
I understood you have talked with some of our folks (Trilok and Carl) a
few years ago about using the mailbox APIs. We were steered away from
using mailboxes then. Is that still the recommendation today?
Neither I nor Google remember any such conversation.
Doorbell had always been supported by the api. It was the
doorbell-mode of _mhu_ controller that had some contention.
I haven't read the complete history of Gunyah yet, but from a quick
look it uses the hvc/smc instruction as the "physical link" between
entities (?). zynqmp-ipi-mailbox.c is one driver that uses smc in
such a manner. And I know there are some platforms that don't call
hvc/smc under mailbox api and I don't blame them.
Let me educate myself with the background and get back.... unless you
want to summarize a usecase that you doubt is supported.
Thanks.