diff options
| author | John Allen <john.allen@amd.com> | 2024-07-30 15:17:30 +0000 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-08-01 14:23:39 +0200 |
| commit | f0fcdd2cb0db62605d85f3b97a1b443e7c91f886 (patch) | |
| tree | 594bfd126222533905e34d41004019eec46bccf7 | |
| parent | 8400291e289ee6b2bf9779ff1c83a291501f017b (diff) | |
ACPI: PRM: Add PRM handler direct call support
Platform Runtime Mechanism (PRM) handlers can be invoked from either the AML
interpreter or directly by an OS driver. Implement the latter.
[ bp: Massage commit message. ]
Signed-off-by: John Allen <john.allen@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Yazen Ghannam <yazen.ghannam@amd.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/20240730151731.15363-2-john.allen@amd.com
| -rw-r--r-- | drivers/acpi/prmt.c | 24 | ||||
| -rw-r--r-- | include/linux/prmt.h | 5 |
2 files changed, 29 insertions, 0 deletions
diff --git a/drivers/acpi/prmt.c b/drivers/acpi/prmt.c index c78453c74ef5..1cfaa5957ac4 100644 --- a/drivers/acpi/prmt.c +++ b/drivers/acpi/prmt.c @@ -214,6 +214,30 @@ static struct prm_handler_info *find_prm_handler(const guid_t *guid) #define UPDATE_LOCK_ALREADY_HELD 4 #define UPDATE_UNLOCK_WITHOUT_LOCK 5 +int acpi_call_prm_handler(guid_t handler_guid, void *param_buffer) +{ + struct prm_handler_info *handler = find_prm_handler(&handler_guid); + struct prm_module_info *module = find_prm_module(&handler_guid); + struct prm_context_buffer context; + efi_status_t status; + + if (!module || !handler) + return -ENODEV; + + memset(&context, 0, sizeof(context)); + ACPI_COPY_NAMESEG(context.signature, "PRMC"); + context.identifier = handler->guid; + context.static_data_buffer = handler->static_data_buffer_addr; + context.mmio_ranges = module->mmio_info; + + status = efi_call_acpi_prm_handler(handler->handler_addr, + (u64)param_buffer, + &context); + + return efi_status_to_err(status); +} +EXPORT_SYMBOL_GPL(acpi_call_prm_handler); + /* * This is the PlatformRtMechanism opregion space handler. * @function: indicates the read/write. In fact as the PlatformRtMechanism diff --git a/include/linux/prmt.h b/include/linux/prmt.h index 24da8364b919..9c094294403f 100644 --- a/include/linux/prmt.h +++ b/include/linux/prmt.h @@ -2,6 +2,11 @@ #ifdef CONFIG_ACPI_PRMT void init_prmt(void); +int acpi_call_prm_handler(guid_t handler_guid, void *param_buffer); #else static inline void init_prmt(void) { } +static inline int acpi_call_prm_handler(guid_t handler_guid, void *param_buffer) +{ + return -EOPNOTSUPP; +} #endif |