[PATCH RESEND 2/4] acpi, hmat: refactor hmat_register_target_initiators()

Huang Ying
2023-07-21T01:45:18Z

Previously, in hmat_register_target_initiators(), the performance
attributes are calculated and the corresponding sysfs links and files
are created too. Which is called during memory onlining.

But now, to calculate the abstract distance of a memory target before
memory onlining, we need to calculate the performance attributes for
a memory target without creating sysfs links and files.

To do that, hmat_register_target_initiators() is refactored to make it
possible to calculate performance attributes separately.

Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Wei Xu <weixugc@google.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Rafael J Wysocki <rafael.j.wysocki@intel.com>
---
drivers/acpi/numa/hmat.c | 81 +++++++++++++++-------------------------
1 file changed, 30 insertions(+), 51 deletions(-)

diff --git a/drivers/acpi/numa/hmat.c b/drivers/acpi/numa/hmat.c
index bba268ecd802..2dee0098f1a9 100644
--- a/drivers/acpi/numa/hmat.c
+++ b/drivers/acpi/numa/hmat.c
@@ -582,28 +582,25 @@ static int initiators_to_nodemask(unsigned long *p_nodes)
return 0;
}

-static void hmat_register_target_initiators(struct memory_target *target)
+static void hmat_update_target_attrs(struct memory_target *target,
+ unsigned long *p_nodes, int access)
{
- static DECLARE_BITMAP(p_nodes, MAX_NUMNODES);
struct memory_initiator *initiator;
- unsigned int mem_nid, cpu_nid;
+ unsigned int cpu_nid;
struct memory_locality *loc = NULL;
u32 best = 0;
- bool access0done = false;
int i;

- mem_nid = pxm_to_node(target->memory_pxm);
+ bitmap_zero(p_nodes, MAX_NUMNODES);
/*
- * If the Address Range Structure provides a local processor pxm, link
+ * If the Address Range Structure provides a local processor pxm, set
* only that one. Otherwise, find the best performance attributes and
- * register all initiators that match.
+ * collect all initiators that match.
*/
if (target->processor_pxm != PXM_INVAL) {
cpu_nid = pxm_to_node(target->processor_pxm);
- register_memory_node_under_compute_node(mem_nid, cpu_nid, 0);
- access0done = true;
- if (node_state(cpu_nid, N_CPU)) {
- register_memory_node_under_compute_node(mem_nid, cpu_nid, 1);
+ if (access == 0 || node_state(cpu_nid, N_CPU)) {
+ set_bit(target->processor_pxm, p_nodes);
return;
}
}
@@ -617,47 +614,10 @@ static void hmat_register_target_initiators(struct memory_target *target)
* We'll also use the sorting to prime the candidate nodes with known
* initiators.
*/
- bitmap_zero(p_nodes, MAX_NUMNODES);
list_sort(NULL, &initiators, initiator_cmp);
if (initiators_to_nodemask(p_nodes) < 0)
return;

- if (!access0done) {
- for (i = WRITE_LATENCY; i <= READ_BANDWIDTH; i++) {
- loc = localities_types[i];
- if (!loc)
- continue;
-
- best = 0;
- list_for_each_entry(initiator, &initiators, node) {
- u32 value;
-
- if (!test_bit(initiator->processor_pxm, p_nodes))
- continue;
-
- value = hmat_initiator_perf(target, initiator,
- loc->hmat_loc);
- if (hmat_update_best(loc->hmat_loc->data_type, value, &best))
- bitmap_clear(p_nodes, 0, initiator->processor_pxm);
- if (value != best)
- clear_bit(initiator->processor_pxm, p_nodes);
- }
- if (best)
- hmat_update_target_access(target, loc->hmat_loc->data_type,
- best, 0);
- }
-
- for_each_set_bit(i, p_nodes, MAX_NUMNODES) {
- cpu_nid = pxm_to_node(i);
- register_memory_node_under_compute_node(mem_nid, cpu_nid, 0);
- }
- }
-
- /* Access 1 ignores Generic Initiators */
- bitmap_zero(p_nodes, MAX_NUMNODES);
- if (initiators_to_nodemask(p_nodes) < 0)
- return;
-
for (i = WRITE_LATENCY; i <= READ_BANDWIDTH; i++) {
loc = localities_types[i];
if (!loc)
@@ -667,7 +627,7 @@ static void hmat_register_target_initiators(struct memory_target *target)
list_for_each_entry(initiator, &initiators, node) {
u32 value;

- if (!initiator->has_cpu) {
+ if (access == 1 && !initiator->has_cpu) {
clear_bit(initiator->processor_pxm, p_nodes);
continue;
}
@@ -681,14 +641,33 @@ static void hmat_register_target_initiators(struct memory_target *target)
clear_bit(initiator->processor_pxm, p_nodes);
}
if (best)
- hmat_update_target_access(target, loc->hmat_loc->data_type, best, 1);
+ hmat_update_target_access(target, loc->hmat_loc->data_type, best, access);
}
+}
+
+static void __hmat_register_target_initiators(struct memory_target *target,
+ unsigned long *p_nodes,
+ int access)
+{
+ unsigned int mem_nid, cpu_nid;
+ int i;
+
+ mem_nid = pxm_to_node(target->memory_pxm);
+ hmat_update_target_attrs(target, p_nodes, access);
for_each_set_bit(i, p_nodes, MAX_NUMNODES) {
cpu_nid = pxm_to_node(i);
- register_memory_node_under_compute_node(mem_nid, cpu_nid, 1);
+ register_memory_node_under_compute_node(mem_nid, cpu_nid, access);
}
}

+static void hmat_register_target_initiators(struct memory_target *target)
+{
+ static DECLARE_BITMAP(p_nodes, MAX_NUMNODES);
+
+ __hmat_register_target_initiators(target, p_nodes, 0);
+ __hmat_register_target_initiators(target, p_nodes, 1);
+}
+
static void hmat_register_target_cache(struct memory_target *target)
{
unsigned mem_nid = pxm_to_node(target->memory_pxm);
--
2.39.2