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lib: Add a new platform feature to bringup secondary harts 

A platform may have a specific method to bring-up secondary harts for the
first time but may rely on generic WFI based approach for hart hotplug in
absence of a platform specific hart hotplug method.

Define a platform feature flag for such platforms. The platform needs to
implement platform specific bring-up method in hart_start and not define
hart_stop method in this case. They must only define
SBI_PLATFORM_HAS_HART_SECONDARY_BOOT.

SBI_PLATFORM_HAS_HART_HOTPLUG should only be defined when the platform
intend to support both hart_start and hart_stop and do not intend to rely
on generic WFI based approach.

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 17:32:36 -08:00 committed by Anup Patel
parent ac5e821d50
commit f64f4b92e4
1 changed files with 5 additions and 0 deletions
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5
include/sbi/sbi_platform.h
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@ -59,6 +59,8 @@ enum sbi_platform_features {
SBI_PLATFORM_HAS_MCOUNTEREN = (1 << 4),
/** Platform has fault delegation support */
SBI_PLATFORM_HAS_MFAULTS_DELEGATION = (1 << 5),
/** Platform has custom secondary hart booting support */
SBI_PLATFORM_HAS_HART_SECONDARY_BOOT = (1 << 6),
};
/** Default feature set for a platform */
@ -204,6 +206,9 @@ struct sbi_platform {
/** Check whether the platform supports fault delegation */
#define sbi_platform_has_mfaults_delegation(__p) \
((__p)->features & SBI_PLATFORM_HAS_MFAULTS_DELEGATION)
/** Check whether the platform supports custom secondary hart booting support */
#define sbi_platform_has_hart_secondary_boot(__p) \
((__p)->features & SBI_PLATFORM_HAS_HART_SECONDARY_BOOT)
/**
* Get name of the platform