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[6.6-velinux] ACPI: PRM: Backport PRM module updates and bugfixes up to v6.14 #31

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[6.6-velinux] ACPI: PRM: Backport PRM module updates and bugfixes up to v6.14 #31

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1cba40d
ACPI: PRM: Annotate struct prm_module_info with __counted_by
kees Mar 11, 2025
f3b4cdd
ACPI: PRM: Add PRM handler direct call support
jallen-amd Mar 11, 2025
45b18e2
ACPI: PRM: Remove unnecessary strict handler address checks
aubreyli Jan 26, 2025
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30 changes: 26 additions & 4 deletions drivers/acpi/prmt.c
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Original file line number Diff line number Diff line change
Expand Up @@ -69,7 +69,7 @@ struct prm_module_info {
bool updatable;

struct list_head module_list;
struct prm_handler_info handlers[];
struct prm_handler_info handlers[] __counted_by(handler_count);
};

static u64 efi_pa_va_lookup(efi_guid_t *guid, u64 pa)
Expand Down Expand Up @@ -224,6 +224,30 @@ 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
Expand Down Expand Up @@ -263,9 +287,7 @@ static acpi_status acpi_platformrt_space_handler(u32 function,
if (!handler || !module)
goto invalid_guid;

if (!handler->handler_addr ||
!handler->static_data_buffer_addr ||
!handler->acpi_param_buffer_addr) {
if (!handler->handler_addr) {
buffer->prm_status = PRM_HANDLER_ERROR;
return AE_OK;
}
Expand Down
5 changes: 5 additions & 0 deletions include/linux/prmt.h
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Original file line number Diff line number Diff line change
Expand Up @@ -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