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lib: Implement hart hotplug

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This patch adds support for hart hotplug in OpenSBI using a generic WFI
based approach. Hart hotplug can be achieved via SBI HSM extension which
allows supervisor mode software to start or stop any harts anytime.

Any platform wishes to implement platform specific hart hotplug must
implement both hart_start and hart_stop in addition to enable platform
feature SBI_PLATFORM_HAS_HART_HOTPLUG.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Atish Patra
2020-02-11 17:32:37 -08:00
committed by Anup Patel
parent f64f4b92e4
commit b677a9b8d6
10 changed files with 343 additions and 2 deletions
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13
lib/sbi/sbi_init.c
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@@ -12,6 +12,7 @@
#include <sbi/sbi_console.h>
#include <sbi/sbi_ecall.h>
#include <sbi/sbi_hart.h>
#include <sbi/sbi_hsm.h>
#include <sbi/sbi_ipi.h>
#include <sbi/sbi_platform.h>
#include <sbi/sbi_system.h>
@@ -85,6 +86,10 @@ static void __noreturn init_coldboot(struct sbi_scratch *scratch, u32 hartid)
if (!init_count_offset)
sbi_hart_hang();
rc = sbi_hsm_init(scratch, hartid, TRUE);
if (rc)
sbi_hart_hang();
rc = sbi_system_early_init(scratch, TRUE);
if (rc)
sbi_hart_hang();
@@ -131,6 +136,7 @@ static void __noreturn init_coldboot(struct sbi_scratch *scratch, u32 hartid)
init_count = sbi_scratch_offset_ptr(scratch, init_count_offset);
(*init_count)++;
sbi_hsm_prepare_next_jump(scratch, hartid);
sbi_hart_switch_mode(hartid, scratch->next_arg1, scratch->next_addr,
scratch->next_mode, FALSE);
}
@@ -146,6 +152,10 @@ static void __noreturn init_warmboot(struct sbi_scratch *scratch, u32 hartid)
if (!init_count_offset)
sbi_hart_hang();
rc = sbi_hsm_init(scratch, hartid, FALSE);
if (rc)
sbi_hart_hang();
rc = sbi_system_early_init(scratch, FALSE);
if (rc)
sbi_hart_hang();
@@ -179,6 +189,7 @@ static void __noreturn init_warmboot(struct sbi_scratch *scratch, u32 hartid)
init_count = sbi_scratch_offset_ptr(scratch, init_count_offset);
(*init_count)++;
sbi_hsm_prepare_next_jump(scratch, hartid);
sbi_hart_switch_mode(hartid, scratch->next_arg1,
scratch->next_addr,
scratch->next_mode, FALSE);
@@ -260,5 +271,5 @@ void __noreturn sbi_exit(struct sbi_scratch *scratch)
sbi_platform_final_exit(plat);
sbi_hart_hang();
sbi_hsm_exit(scratch);
}