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lib: improve system reboot and shutdown implementation
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>
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2 changed files with 26 additions and 17 deletions
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@ -22,10 +22,8 @@ void sbi_system_early_exit(struct sbi_scratch *scratch);
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void sbi_system_final_exit(struct sbi_scratch *scratch);
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void __attribute__((noreturn))
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sbi_system_reboot(struct sbi_scratch *scratch, u32 type);
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void __noreturn sbi_system_reboot(struct sbi_scratch *scratch, u32 type);
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void __attribute__((noreturn))
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sbi_system_shutdown(struct sbi_scratch *scratch, u32 type);
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void __noreturn sbi_system_shutdown(struct sbi_scratch *scratch, u32 type);
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#endif
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@ -12,6 +12,7 @@
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#include <sbi/sbi_platform.h>
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#include <sbi/sbi_system.h>
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#include <sbi/sbi_ipi.h>
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#include <sbi/sbi_init.h>
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int sbi_system_early_init(struct sbi_scratch *scratch, bool cold_boot)
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{
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@ -33,24 +34,34 @@ void sbi_system_final_exit(struct sbi_scratch *scratch)
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sbi_platform_final_exit(sbi_platform_ptr(scratch));
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}
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void __attribute__((noreturn))
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sbi_system_reboot(struct sbi_scratch *scratch, u32 type)
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void __noreturn sbi_system_reboot(struct sbi_scratch *scratch, u32 type)
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{
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u32 current_hartid_mask = 1UL << sbi_current_hartid();
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/* Send HALT IPI to every hart other than the current hart */
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sbi_ipi_send_many(scratch,
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sbi_hart_available_mask() & ~current_hartid_mask,
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0, SBI_IPI_EVENT_HALT, NULL);
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/* Platform specific reooot */
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sbi_platform_system_reboot(sbi_platform_ptr(scratch), type);
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sbi_hart_hang();
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/* If platform specific reboot did not work then do sbi_exit() */
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sbi_exit(scratch);
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}
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void __attribute__((noreturn))
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sbi_system_shutdown(struct sbi_scratch *scratch, u32 type)
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void __noreturn sbi_system_shutdown(struct sbi_scratch *scratch, u32 type)
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{
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/* First try the platform-specific method */
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u32 current_hartid_mask = 1UL << sbi_current_hartid();
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/* Send HALT IPI to every hart other than the current hart */
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sbi_ipi_send_many(scratch,
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sbi_hart_available_mask() & ~current_hartid_mask,
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0, SBI_IPI_EVENT_HALT, NULL);
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/* Platform specific shutdown */
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sbi_platform_system_shutdown(sbi_platform_ptr(scratch), type);
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/* If that fails (or is not implemented) send an IPI on every
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* hart to hang and then hang the current hart */
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sbi_ipi_send_many(scratch, sbi_hart_available_mask(), 0,
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SBI_IPI_EVENT_HALT, NULL);
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sbi_hart_hang();
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/* If platform specific shutdown did not work then do sbi_exit() */
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sbi_exit(scratch);
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}
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