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lib: sbi_domain: Introduce domain intialization order

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Currently, the domain initialization order is implied by the order
in which domains are populated by sbi_platform_domains_init() from
sbi_domain_finalize(). This is not documented anywhere and forces
unecessary ordering between domain DT nodes.

To address the above, introduce per-domain 32-bit integer to represent
intialization order (aka "init_order") where domain with a lower
initialization order will be booted first and two domains must not
have same initialization order. For DT based domain creation, new
"init-order" DT property can be used in domain DT node to specify
the initialization order. The ROOT domain is assumed to have lowest
initialization order (aka 0xffffffff).

Signed-off-by: Anup Patel <anup.patel@oss.qualcomm.com>
Reviewed-by: Pawandeep Oza <pawandeep.oza@oss.qualcomm.com>
Tested-by: Pawandeep Oza <pawandeep.oza@oss.qualcomm.com>
Reviewed-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
Link: https://lore.kernel.org/r/20260905131748.922920-4-anup.patel@oss.qualcomm.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Anup Patel
2026-09-16 09:21:21 +05:30
committed by Anup Patel
parent 71faf5a307
commit 55b6b73435
5 changed files with 41 additions and 15 deletions
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lib/sbi/sbi_domain.c
+14 -7
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@@ -28,6 +28,7 @@ static bool domain_finalized = false;
struct sbi_domain root = {
.name = "root",
.init_order = -1U,
.possible_harts = NULL,
.regions = NULL,
.system_reset_allowed = true,
@@ -537,6 +538,9 @@ void sbi_domain_dump(const struct sbi_domain *dom, const char *suffix)
sbi_printf("Domain%d Name %s: %s\n",
dom->index, suffix, dom->name);
sbi_printf("Domain%d Init Order %s: 0x%x\n",
dom->index, suffix, dom->init_order);
sbi_printf("Domain%d Boot HART %s: %d\n",
dom->index, suffix, dom->boot_hartid);
@@ -635,9 +639,14 @@ int sbi_domain_register(struct sbi_domain *dom)
if (!dom || domain_finalized)
return SBI_EINVAL;
/* Check if domain already discovered */
/*
* Ensure that:
* 1) Domain not already registered
* 2) Initialization order is unique
*/
sbi_domain_for_each(tdom) {
if (tdom == dom)
if (tdom == dom ||
tdom->init_order == dom->init_order)
return SBI_EALREADY;
}
@@ -662,15 +671,13 @@ int sbi_domain_register(struct sbi_domain *dom)
sbi_hartmask_clear_all(&dom->assigned_harts);
/*
* Assign a non-ROOT domain to a HART on first come first serve
* basis if the HART is listed as a possible HART of the non-ROOT
* domain. If no non-ROOT domain list a HART as possible HART then
* the HART is assigned to the ROOT domain.
* Assign HART to a domain with the least initialization order
* where the HART is listed as a possible HART of the domain.
*/
sbi_hartmask_for_each_hartindex(i, dom->possible_harts) {
tdom = sbi_hartindex_to_domain(i);
if (tdom) {
if (tdom == &root)
if (tdom->init_order > dom->init_order)
sbi_hartmask_clear_hartindex(i, &tdom->assigned_harts);
else
continue;