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lib: improve system reboot and shutdown implementation

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We improve sbi_system_reboot() an sbi_system_shutdown() by:

1. Calling halt IPI to all harts (except current HART) before
   calling platform reboot/shutdown hook.
2. Calling sbi_exit() instead of sbi_hang() in-case platform
   reboot/shutdown hook failed.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel 2020-01-03 11:17:44 +05:30
parent b0c9787435
commit 15ed1e7452
2 changed files with 26 additions and 17 deletions
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6
include/sbi/sbi_system.h
View file

@ -22,10 +22,8 @@ void sbi_system_early_exit(struct sbi_scratch *scratch);
void sbi_system_final_exit(struct sbi_scratch *scratch);
void __attribute__((noreturn))
sbi_system_reboot(struct sbi_scratch *scratch, u32 type);
void __noreturn sbi_system_reboot(struct sbi_scratch *scratch, u32 type);
void __attribute__((noreturn))
sbi_system_shutdown(struct sbi_scratch *scratch, u32 type);
void __noreturn sbi_system_shutdown(struct sbi_scratch *scratch, u32 type);
#endif

37
lib/sbi/sbi_system.c
View file

@ -12,6 +12,7 @@
#include <sbi/sbi_platform.h>
#include <sbi/sbi_system.h>
#include <sbi/sbi_ipi.h>
#include <sbi/sbi_init.h>
int sbi_system_early_init(struct sbi_scratch *scratch, bool cold_boot)
{
@ -33,24 +34,34 @@ void sbi_system_final_exit(struct sbi_scratch *scratch)
sbi_platform_final_exit(sbi_platform_ptr(scratch));
}
void __attribute__((noreturn))
sbi_system_reboot(struct sbi_scratch *scratch, u32 type)
void __noreturn sbi_system_reboot(struct sbi_scratch *scratch, u32 type)
{
u32 current_hartid_mask = 1UL << sbi_current_hartid();
/* Send HALT IPI to every hart other than the current hart */
sbi_ipi_send_many(scratch,
sbi_hart_available_mask() & ~current_hartid_mask,
0, SBI_IPI_EVENT_HALT, NULL);
/* Platform specific reooot */
sbi_platform_system_reboot(sbi_platform_ptr(scratch), type);
sbi_hart_hang();
/* If platform specific reboot did not work then do sbi_exit() */
sbi_exit(scratch);
}
void __attribute__((noreturn))
sbi_system_shutdown(struct sbi_scratch *scratch, u32 type)
void __noreturn sbi_system_shutdown(struct sbi_scratch *scratch, u32 type)
{
/* First try the platform-specific method */
u32 current_hartid_mask = 1UL << sbi_current_hartid();
/* Send HALT IPI to every hart other than the current hart */
sbi_ipi_send_many(scratch,
sbi_hart_available_mask() & ~current_hartid_mask,
0, SBI_IPI_EVENT_HALT, NULL);
/* Platform specific shutdown */
sbi_platform_system_shutdown(sbi_platform_ptr(scratch), type);
/* If that fails (or is not implemented) send an IPI on every
* hart to hang and then hang the current hart */
sbi_ipi_send_many(scratch, sbi_hart_available_mask(), 0,
SBI_IPI_EVENT_HALT, NULL);
sbi_hart_hang();
/* If platform specific shutdown did not work then do sbi_exit() */
sbi_exit(scratch);
}