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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: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: "Mario Limonciello (AMD)" <superm1@kernel.org>
Acked-by: "Rafael J. Wysocki (Intel)" <rafael@kernel.org>
Link: https://patch.msgid.link/all/20251017-wip-atl-prm-v2-1-7ab1df4a5fbc@amd.com
pull/1354/merge
Yazen Ghannam 2025-10-17 13:26:28 +00:00 committed by Borislav Petkov (AMD)
parent 6553c68bc7
commit 83be4bee57
2 changed files with 8 additions and 0 deletions
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6
drivers/acpi/prmt.c
View File

@ -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); 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 */ /* In-coming PRM commands */
#define PRM_CMD_RUN_SERVICE 0 #define PRM_CMD_RUN_SERVICE 0

2
include/linux/prmt.h
View File

@ -4,9 +4,11 @@
#ifdef CONFIG_ACPI_PRMT #ifdef CONFIG_ACPI_PRMT
void init_prmt(void); 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); int acpi_call_prm_handler(guid_t handler_guid, void *param_buffer);
#else #else
static inline void init_prmt(void) { } 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) static inline int acpi_call_prm_handler(guid_t handler_guid, void *param_buffer)
{ {
return -EOPNOTSUPP; return -EOPNOTSUPP;