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authorYazen Ghannam <yazen.ghannam@amd.com>2025-10-17 13:26:28 +0000
committerBorislav Petkov (AMD) <bp@alien8.de>2025-10-27 15:45:22 +0100
commit83be4bee57f0374ff751aaff3fef4af0af66ec81 (patch)
tree079192943dfd94adbc39f67b50fa1199d2cf7247
parent6553c68bc73dccfb3c8a9971ee40ed378adc0df4 (diff)
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
-rw-r--r--drivers/acpi/prmt.c6
-rw-r--r--include/linux/prmt.h2
2 files changed, 8 insertions, 0 deletions
diff --git a/drivers/acpi/prmt.c b/drivers/acpi/prmt.c
index 6792d4385eee..7b8b5d2015ec 100644
--- a/drivers/acpi/prmt.c
+++ b/drivers/acpi/prmt.c
@@ -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
diff --git a/include/linux/prmt.h b/include/linux/prmt.h
index c53ab287e932..8cdc987de963 100644
--- a/include/linux/prmt.h
+++ b/include/linux/prmt.h
@@ -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;