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ACPI: PRM: Add PRM handler direct call support

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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
This commit is contained in:
John Allen 2024-07-30 15:17:30 +00:00 committed by Borislav Petkov (AMD)
parent 8400291e28
commit f0fcdd2cb0
2 changed files with 29 additions and 0 deletions
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24
drivers/acpi/prmt.c
View file

@ -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

5
include/linux/prmt.h
View file

@ -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