Commit 83be4bee authored by Yazen Ghannam's avatar Yazen Ghannam Committed by Borislav Petkov (AMD)
Browse files

ACPI: PRM: Add acpi_prm_handler_available() 



Add a helper function to check if a PRM handler/module is present.

This can be used during init time by code that depends on a particular
handler. If the handler is not present, then the code does not need to
be loaded.

Signed-off-by: default avatarYazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: default avatar"Mario Limonciello (AMD)" <superm1@kernel.org>
Acked-by: default avatar"Rafael J. Wysocki (Intel)" <rafael@kernel.org>
Link: https://patch.msgid.link/all/20251017-wip-atl-prm-v2-1-7ab1df4a5fbc@amd.com
parent 6553c68b

drivers/acpi/prmt.c

+6 −0
Original line number Diff line number Diff line
@@ -244,6 +244,12 @@ static struct prm_handler_info *find_prm_handler(const guid_t *guid) 
	return (struct prm_handler_info *) find_guid_info(guid, GET_HANDLER);

}



bool acpi_prm_handler_available(const guid_t *guid)

{

	return find_prm_handler(guid) && find_prm_module(guid);

}

EXPORT_SYMBOL_GPL(acpi_prm_handler_available);



/* In-coming PRM commands */



#define PRM_CMD_RUN_SERVICE		0

include/linux/prmt.h

+2 −0
Original line number Diff line number Diff line
@@ -4,9 +4,11 @@ 


#ifdef CONFIG_ACPI_PRMT

void init_prmt(void);

bool acpi_prm_handler_available(const guid_t *handler_guid);

int acpi_call_prm_handler(guid_t handler_guid, void *param_buffer);

#else

static inline void init_prmt(void) { }

static inline bool acpi_prm_handler_available(const guid_t *handler_guid) { return false; }

static inline int acpi_call_prm_handler(guid_t handler_guid, void *param_buffer)

{

	return -EOPNOTSUPP;