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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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docs/domain_support.md
+8
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@@ -39,6 +39,9 @@ has following details:
* **index** - Logical index of this domain
* **name** - Name of this domain
* **init_order** - Initialization order of this domain. Domain with a
lower initialization order will be booted first and two domains must
not have same initialization order.
* **assigned_harts** - HARTs assigned to this domain
* **possible_harts** - HARTs possible in this domain
* **regions** - Array of memory regions terminated by a memory region
@@ -75,6 +78,8 @@ following manner:
* **index** - Logical index of the ROOT domain is always zero
* **name** - Name of the ROOT domain is "root"
* **init_order** - Initialization order of the ROOT domain is always
0xffffffff (aka maximum possible 32-bit value)
* **assigned_harts** - At boot-time all valid HARTs of a RISC-V platform
are assigned the ROOT domain which changes later based on OpenSBI
platform support
@@ -156,6 +161,9 @@ The DT properties of a domain instance DT node are as follows:
* **compatible** (Mandatory) - The compatible string of the domain instance.
This DT property should have value *"opensbi,domain,instance"*
* **init-order** (Optional) - The 32-bit initialization order for the domain
instance. If this DT property is not available then domain instance DT node
offset is used as default value.
* **possible-harts** (Optional) - The list of CPU DT node phandles for the
the domain instance. This list represents the possible HARTs of the
domain instance.