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path: root/drivers/acpi/numa/hmat.c
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Diffstat (limited to 'drivers/acpi/numa/hmat.c')
-rw-r--r--drivers/acpi/numa/hmat.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/acpi/numa/hmat.c b/drivers/acpi/numa/hmat.c
index 75e9aac432..2c8ccc91eb 100644
--- a/drivers/acpi/numa/hmat.c
+++ b/drivers/acpi/numa/hmat.c
@@ -74,6 +74,7 @@ struct memory_target {
struct node_cache_attrs cache_attrs;
u8 gen_port_device_handle[ACPI_SRAT_DEVICE_HANDLE_SIZE];
bool registered;
+ bool ext_updated; /* externally updated */
};
struct memory_initiator {
@@ -328,6 +329,35 @@ static void hmat_update_target_access(struct memory_target *target,
}
}
+int hmat_update_target_coordinates(int nid, struct access_coordinate *coord,
+ enum access_coordinate_class access)
+{
+ struct memory_target *target;
+ int pxm;
+
+ if (nid == NUMA_NO_NODE)
+ return -EINVAL;
+
+ pxm = node_to_pxm(nid);
+ guard(mutex)(&target_lock);
+ target = find_mem_target(pxm);
+ if (!target)
+ return -ENODEV;
+
+ hmat_update_target_access(target, ACPI_HMAT_READ_LATENCY,
+ coord->read_latency, access);
+ hmat_update_target_access(target, ACPI_HMAT_WRITE_LATENCY,
+ coord->write_latency, access);
+ hmat_update_target_access(target, ACPI_HMAT_READ_BANDWIDTH,
+ coord->read_bandwidth, access);
+ hmat_update_target_access(target, ACPI_HMAT_WRITE_BANDWIDTH,
+ coord->write_bandwidth, access);
+ target->ext_updated = true;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(hmat_update_target_coordinates);
+
static __init void hmat_add_locality(struct acpi_hmat_locality *hmat_loc)
{
struct memory_locality *loc;
@@ -699,6 +729,10 @@ static void hmat_update_target_attrs(struct memory_target *target,
u32 best = 0;
int i;
+ /* Don't update if an external agent has changed the data. */
+ if (target->ext_updated)
+ return;
+
/* Don't update for generic port if there's no device handle */
if ((access == NODE_ACCESS_CLASS_GENPORT_SINK_LOCAL ||
access == NODE_ACCESS_CLASS_GENPORT_SINK_CPU) &&