@@ -29,6 +29,8 @@ static int node_to_pxm_map[MAX_NUMNODES]
unsigned char acpi_srat_revision __initdata;
static int acpi_numa __initdata;
+static int last_real_pxm;
+
void __init disable_srat(void)
{
acpi_numa = -1;
@@ -536,6 +538,7 @@ int __init acpi_numa_init(void)
if (node_to_pxm_map[i] > fake_pxm)
fake_pxm = node_to_pxm_map[i];
}
+ last_real_pxm = fake_pxm;
fake_pxm++;
acpi_table_parse_cedt(ACPI_CEDT_TYPE_CFMWS, acpi_parse_cfmws,
&fake_pxm);
@@ -547,6 +550,14 @@ int __init acpi_numa_init(void)
return 0;
}
+bool acpi_node_backed_by_real_pxm(int nid)
+{
+ int pxm = node_to_pxm(nid);
+
+ return pxm <= last_real_pxm;
+}
+EXPORT_SYMBOL_GPL(acpi_node_backed_by_real_pxm);
+
static int acpi_get_pxm(acpi_handle h)
{
unsigned long long pxm;
@@ -215,6 +215,7 @@ void node_set_perf_attrs(unsigned int nid, struct access_coordinate *coord,
}
}
}
+EXPORT_SYMBOL_GPL(node_set_perf_attrs);
/**
* struct node_cache_info - Internal tracking for memory node caches
@@ -626,3 +626,8 @@ int cxl_update_hmat_access_coordinates(int nid, struct cxl_region *cxlr,
{
return hmat_update_target_coordinates(nid, &cxlr->coord[access], access);
}
+
+bool cxl_need_node_perf_attrs_update(int nid)
+{
+ return !acpi_node_backed_by_real_pxm(nid);
+}
@@ -92,5 +92,6 @@ long cxl_pci_get_latency(struct pci_dev *pdev);
int cxl_update_hmat_access_coordinates(int nid, struct cxl_region *cxlr,
enum access_coordinate_class access);
+bool cxl_need_node_perf_attrs_update(int nid);
#endif /* __CXL_CORE_H__ */
@@ -3084,7 +3084,12 @@ static bool cxl_region_update_coordinates(struct cxl_region *cxlr, int nid)
for (int i = 0; i < ACCESS_COORDINATE_MAX; i++) {
if (cxlr->coord[i].read_bandwidth) {
- rc = cxl_update_hmat_access_coordinates(nid, cxlr, i);
+ rc = 0;
+ if (cxl_need_node_perf_attrs_update(nid))
+ node_set_perf_attrs(nid, &cxlr->coord[i], i);
+ else
+ rc = cxl_update_hmat_access_coordinates(nid, cxlr, i);
+
if (rc == 0)
cset++;
}
@@ -447,6 +447,7 @@ static inline int hmat_update_target_coordinates(int nid,
#ifdef CONFIG_ACPI_NUMA
int acpi_map_pxm_to_node(int pxm);
int acpi_get_node(acpi_handle handle);
+bool acpi_node_backed_by_real_pxm(int nid);
/**
* pxm_to_online_node - Map proximity ID to online node
For the numa nodes that are not created by SRAT, no memory_target is allocated and is not managed by the HMAT_REPORTING code. Therefore hmat_callback() memory hotplug notifier will exit early on those NUMA nodes. The CXL memory hotplug notifier will need to call node_set_perf_attrs() directly in order to setup the access sysfs attributes. In acpi_numa_init(), the last proximity domain (pxm) id created by SRAT is stored. Add a helper function acpi_node_backed_by_real_pxm() in order to check if a NUMA node id is defined by SRAT or created by CFMWS or some other methods. node_set_perf_attrs() symbol is exported to allow update of perf attribs for a node. The sysfs path of /sys/devices/system/node/nodeX/access0/initiators/* is created by ndoe_set_perf_attrs() for the various attributes where nodeX is matched to the NUMA node of the CXL region. Cc: Rafael J. Wysocki <rafael@kernel.org> Signed-off-by: Dave Jiang <dave.jiang@intel.com> --- drivers/acpi/numa/srat.c | 11 +++++++++++ drivers/base/node.c | 1 + drivers/cxl/core/cdat.c | 5 +++++ drivers/cxl/core/core.h | 1 + drivers/cxl/core/region.c | 7 ++++++- include/linux/acpi.h | 1 + 6 files changed, 25 insertions(+), 1 deletion(-)