ACPI 5.1 adds a _CCA object to indicate memory coherency
of a bus master device. It is an integer with zero meaning
non-coherent and one meaning coherent. This attribute may
be inherited from a parent device. It may also be missing
entirely, in which case, an architecture-specific default
is assumed.
This patch adds a utility function to parse a device handle
(and its parents) for a _CCA object and return the coherency
attribute if found.
Signed-off-by: Mark Salter <msalter@xxxxxxxxxx>
---
drivers/acpi/utils.c | 26 ++++++++++++++++++++++++++
include/acpi/acpi_bus.h | 2 ++
2 files changed, 28 insertions(+)
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 07c8c5a..aec9656 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -698,3 +698,29 @@ bool acpi_check_dsm(acpi_handle handle, const u8 *uuid, int rev, u64 funcs)
return false;
}
EXPORT_SYMBOL(acpi_check_dsm);
+
+/**
+ * acpi_check_coherency - check for memory coherency of a device
+ * @handle: ACPI device handle
+ * @val: Pointer to returned value
+ *
+ * Search a device and its parents for a _CCA method and return
+ * its value.
+ */
+acpi_status acpi_check_coherency(acpi_handle handle, int *val)
+{
+ unsigned long long data;
+ acpi_status status;
+
+ do {
+ status = acpi_evaluate_integer(handle, "_CCA", NULL, &data);
+ if (!ACPI_FAILURE(status)) {
+ *val = data;
+ break;
+ }
+ status = acpi_get_parent(handle, &handle);
+ } while (!ACPI_FAILURE(status));
+
+ return status;
+}
+EXPORT_SYMBOL(acpi_check_coherency);
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index bcfd808..b97f09d 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -68,6 +68,8 @@ bool acpi_check_dsm(acpi_handle handle, const u8 *uuid, int rev, u64 funcs);
union acpi_object *acpi_evaluate_dsm(acpi_handle handle, const u8 *uuid,
int rev, int func, union acpi_object *argv4);
+acpi_status acpi_check_coherency(acpi_handle handle, int *val);
+
static inline union acpi_object *
acpi_evaluate_dsm_typed(acpi_handle handle, const u8 *uuid, int rev, int func,
union acpi_object *argv4, acpi_object_type type)
--
1.8.3.1
--
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