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lib: sbi_domain: Re-work boot-time assignment of HARTs to non-ROOT domains

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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.

This allows us to drop the OpenSBI specific DT property from each CPU DT
node (aka "opensbi-domain" Dt property).

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/20260905131748.922920-3-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 6dc5a896b1
commit 71faf5a307
5 changed files with 42 additions and 142 deletions
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lib/utils/fdt/fdt_domain.c
+7 -95
View File
@@ -170,26 +170,11 @@ static int __fixup_disable_devices(void *fdt, int doff, int roff,
void fdt_domain_fixup(void *fdt)
{
u32 i, dcount;
u32 dcount;
int err, poffset, doffset;
struct sbi_domain *dom = sbi_domain_thishart_ptr();
struct __fixup_find_domain_offset_info fdo;
/* Remove the domain assignment DT property from CPU DT nodes */
poffset = fdt_path_offset(fdt, "/cpus");
if (poffset < 0)
return;
fdt_for_each_subnode(doffset, fdt, poffset) {
err = fdt_parse_hart_id(fdt, doffset, &i);
if (err)
continue;
if (!fdt_node_is_enabled(fdt, doffset))
continue;
fdt_nop_property(fdt, doffset, "opensbi-domain");
}
/* Skip device disable for root domain */
if (!dom->index)
goto skip_device_disable;
@@ -315,12 +300,10 @@ static int __fdt_parse_domain(const void *fdt, int domain_offset, void *opaque)
const char *inherit;
struct sbi_domain *dom;
struct sbi_hartmask *mask;
struct sbi_hartmask assign_mask;
struct parse_region_data preg;
int *cold_domain_offset = opaque;
struct sbi_domain_memregion *reg;
int inheritance_mode = FDT_ROOT_REGION_INHERIT_M_ONLY;
int i, err = 0, len, cpus_offset, cpu_offset, doffset;
int i, err = 0, len, cpu_offset;
dom = sbi_zalloc(sizeof(*dom));
if (!dom)
@@ -440,7 +423,7 @@ static int __fdt_parse_domain(const void *fdt, int domain_offset, void *opaque)
val64 = fdt32_to_cpu(val[0]);
val64 = (val64 << 32) | fdt32_to_cpu(val[1]);
} else {
val64 = sbi_scratch_thishart_ptr()->next_arg1;
val64 = root.next_arg1;
}
dom->next_arg1 = val64;
@@ -451,8 +434,7 @@ static int __fdt_parse_domain(const void *fdt, int domain_offset, void *opaque)
val64 = fdt32_to_cpu(val[0]);
val64 = (val64 << 32) | fdt32_to_cpu(val[1]);
} else {
if (domain_offset == *cold_domain_offset)
val64 = sbi_scratch_thishart_ptr()->next_addr;
val64 = root.next_addr;
}
dom->next_addr = val64;
@@ -464,8 +446,7 @@ static int __fdt_parse_domain(const void *fdt, int domain_offset, void *opaque)
if (val32 != 0x0 && val32 != 0x1)
val32 = 0x1;
} else {
if (domain_offset == *cold_domain_offset)
val32 = sbi_scratch_thishart_ptr()->next_mode;
val32 = root.next_mode;
}
dom->next_mode = val32;
@@ -483,44 +464,8 @@ static int __fdt_parse_domain(const void *fdt, int domain_offset, void *opaque)
else
dom->system_suspend_allowed = false;
/* Find /cpus DT node */
cpus_offset = fdt_path_offset(fdt, "/cpus");
if (cpus_offset < 0) {
err = cpus_offset;
goto fail_free_all;
}
/* HART to domain assignment mask based on CPU DT nodes */
sbi_hartmask_clear_all(&assign_mask);
fdt_for_each_subnode(cpu_offset, fdt, cpus_offset) {
err = fdt_parse_hart_id(fdt, cpu_offset, &val32);
if (err)
continue;
if (SBI_HARTMASK_MAX_BITS <= sbi_hartid_to_hartindex(val32))
continue;
if (!fdt_node_is_enabled(fdt, cpu_offset))
continue;
/* This is an optional property */
val = fdt_getprop(fdt, cpu_offset, "opensbi-domain", &len);
if (!val || len < 4)
continue;
/* However, it should be valid if specified */
doffset = fdt_node_offset_by_phandle(fdt, fdt32_to_cpu(*val));
if (doffset < 0) {
err = doffset;
goto fail_free_all;
}
if (doffset == domain_offset)
sbi_hartmask_set_hartid(val32, &assign_mask);
}
/* Register the domain */
err = sbi_domain_register(dom, &assign_mask);
err = sbi_domain_register(dom);
if (err)
goto fail_free_all;
@@ -537,43 +482,10 @@ fail_free_domain:
int fdt_domains_populate(const void *fdt)
{
const u32 *val;
int cold_domain_offset;
u32 hartid, cold_hartid;
int err, len, cpus_offset, cpu_offset;
/* Sanity checks */
if (!fdt)
return SBI_EINVAL;
/* Find /cpus DT node */
cpus_offset = fdt_path_offset(fdt, "/cpus");
if (cpus_offset < 0)
return cpus_offset;
/* Find coldboot HART domain DT node offset */
cold_domain_offset = -1;
cold_hartid = current_hartid();
fdt_for_each_subnode(cpu_offset, fdt, cpus_offset) {
err = fdt_parse_hart_id(fdt, cpu_offset, &hartid);
if (err)
continue;
if (hartid != cold_hartid)
continue;
if (!fdt_node_is_enabled(fdt, cpu_offset))
continue;
val = fdt_getprop(fdt, cpu_offset, "opensbi-domain", &len);
if (val && len >= 4)
cold_domain_offset = fdt_node_offset_by_phandle(fdt,
fdt32_to_cpu(*val));
break;
}
/* Iterate over each domain in FDT and populate details */
return fdt_iterate_each_domain_ro(fdt, &cold_domain_offset,
__fdt_parse_domain);
return fdt_iterate_each_domain_ro(fdt, NULL, __fdt_parse_domain);
}