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lib: sbi_hsm: Fix sbi_hsm_hart_start() for platform with hart hotplug

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It possible that a platform supports hart hotplug (i.e. both hart_start
and hart_stop callbacks available) and all harts are start simultaneously
at platform boot-time. In this situation, the sbi_hsm_hart_start() will
call hsm_device_hart_start() for secondary harts at platform boot-time
which will fail because secondary harts were already started.

To fix above, we call hsm_device_hart_start() from sbi_hsm_hart_start()
only when entry_count is same as init_count for the secondary hart.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
This commit is contained in:
Anup Patel 2023-03-20 18:58:54 +05:30 • committed by Anup Patel
parent f64dfcd2b5
commit 30b9e7ee14
1 changed files with 4 additions and 2 deletions
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6
lib/sbi/sbi_hsm.c
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@ -301,7 +301,7 @@ int sbi_hsm_hart_start(struct sbi_scratch *scratch,
const struct sbi_domain *dom,
u32 hartid, ulong saddr, ulong smode, ulong arg1)
{
unsigned long init_count;
unsigned long init_count, entry_count;
unsigned int hstate;
struct sbi_scratch *rscratch;
struct sbi_hsm_data *hdata;
@ -325,6 +325,8 @@ int sbi_hsm_hart_start(struct sbi_scratch *scratch,
return SBI_EINVAL;
init_count = sbi_init_count(hartid);
entry_count = sbi_entry_count(hartid);
rscratch->next_arg1 = arg1;
rscratch->next_addr = saddr;
rscratch->next_mode = smode;
@ -350,7 +352,7 @@ int sbi_hsm_hart_start(struct sbi_scratch *scratch,
goto err;
}
if (hsm_device_has_hart_hotplug() ||
if ((hsm_device_has_hart_hotplug() && (entry_count == init_count)) ||
(hsm_device_has_hart_secondary_boot() && !init_count)) {
rc = hsm_device_hart_start(hartid, scratch->warmboot_addr);
} else {