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lib: utils/mpxy: bind channel access to owning domain

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The MPXY framework currently stores registered channels in a global
list and exposes them to all callers. However, the intended model is
that each channel is assigned to a single supervisor domain at boot and
remains owned by that domain for its lifetime.

Introduce fixed owner-domain tracking in struct sbi_mpxy_channel and
make channel lookup and enumeration domain-aware. A channel is now
visible only when accessed from its owning domain. Also require the
owner to be set before channel registration.

This allows MPXY to support systems where the same hart may be reused by
multiple domains while keeping channel ownership and visibility fixed to
the domain that owns the service.

Signed-off-by: Oza Pawandeep <pawandeep.oza@oss.qualcomm.com>
Reviewed-by: Rahul Pathak <rahul.pathak@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260721215758.695736-1-pawandeep.oza@oss.qualcomm.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Oza Pawandeep
2026-07-22 13:58:30 +05:30
committed by Anup Patel
parent 7a90f41fb9
commit c0f87f10d1
3 changed files with 50 additions and 11 deletions
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lib/utils/mpxy/fdt_mpxy_rpmi_mbox.c
+2
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@@ -299,6 +299,8 @@ int mpxy_rpmi_mbox_init(const void *fdt, int nodeoff, const struct fdt_match *ma
/* Setup MPXY mbox client */
/* Channel ID*/
rmb->channel.channel_id = channel_id;
/* Set the owner domain */
rmb->channel.owner_domain = &root;
/* Callback for read RPMI attributes */
rmb->channel.read_attributes = mpxy_mbox_read_attributes;
/* Callback for write RPMI attributes */