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Message-ID: <20251006-wip-atl-prm-v1-1-4a62967fb2b0@amd.com>
Date: Mon, 6 Oct 2025 15:10:25 +0000
From: Yazen Ghannam <yazen.ghannam@....com>
To: "Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>,
Yazen Ghannam <Yazen.Ghannam@....com>, Tony Luck <tony.luck@...el.com>,
Borislav Petkov <bp@...en8.de>
CC: <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-edac@...r.kernel.org>, Avadhut Naik <avadhut.naik@....com>, John Allen
<john.allen@....com>, Mario Limonciello <mario.limonciello@....com>, "Yazen
Ghannam" <yazen.ghannam@....com>
Subject: [PATCH 1/3] 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@....com>
---
drivers/acpi/prmt.c | 6 ++++++
include/linux/prmt.h | 2 ++
2 files changed, 8 insertions(+)
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;
--
2.51.0
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