summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorAlison Schofield <alison.schofield@intel.com>2021-10-29 21:51:59 +0200
committerDan Williams <dan.j.williams@intel.com>2021-11-15 20:03:00 +0100
commitfd49f99c180996cef2d707ad71bee4f060dbe367 (patch)
tree5a47323f69f054f967b8341ee4ad0757a6878b18
parentcxl/test: Mock acpi_table_parse_cedt() (diff)
downloadlinux-fd49f99c180996cef2d707ad71bee4f060dbe367.tar.xz
linux-fd49f99c180996cef2d707ad71bee4f060dbe367.zip
ACPI: NUMA: Add a node and memblk for each CFMWS not in SRAT
During NUMA init, CXL memory defined in the SRAT Memory Affinity subtable may be assigned to a NUMA node. Since there is no requirement that the SRAT be comprehensive for CXL memory another mechanism is needed to assign NUMA nodes to CXL memory not identified in the SRAT. Use the CXL Fixed Memory Window Structure (CFMWS) of the ACPI CXL Early Discovery Table (CEDT) to find all CXL memory ranges. Create a NUMA node for each CFMWS that is not already assigned to a NUMA node. Add a memblk attaching its host physical address range to the node. Note that these ranges may not actually map any memory at boot time. They may describe persistent capacity or may be present to enable hot-plug. Consumers can use phys_to_target_node() to discover the NUMA node. Signed-off-by: Alison Schofield <alison.schofield@intel.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Link: https://lore.kernel.org/r/163553711933.2509508.2203471175679990.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>
-rw-r--r--drivers/acpi/numa/srat.c59
-rw-r--r--drivers/cxl/acpi.c3
2 files changed, 60 insertions, 2 deletions
diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c
index b8795fc49097..66a0142dc78c 100644
--- a/drivers/acpi/numa/srat.c
+++ b/drivers/acpi/numa/srat.c
@@ -298,6 +298,47 @@ out_err_bad_srat:
out_err:
return -EINVAL;
}
+
+static int __init acpi_parse_cfmws(union acpi_subtable_headers *header,
+ void *arg, const unsigned long table_end)
+{
+ struct acpi_cedt_cfmws *cfmws;
+ int *fake_pxm = arg;
+ u64 start, end;
+ int node;
+
+ cfmws = (struct acpi_cedt_cfmws *)header;
+ start = cfmws->base_hpa;
+ end = cfmws->base_hpa + cfmws->window_size;
+
+ /* Skip if the SRAT already described the NUMA details for this HPA */
+ node = phys_to_target_node(start);
+ if (node != NUMA_NO_NODE)
+ return 0;
+
+ node = acpi_map_pxm_to_node(*fake_pxm);
+
+ if (node == NUMA_NO_NODE) {
+ pr_err("ACPI NUMA: Too many proximity domains while processing CFMWS.\n");
+ return -EINVAL;
+ }
+
+ if (numa_add_memblk(node, start, end) < 0) {
+ /* CXL driver must handle the NUMA_NO_NODE case */
+ pr_warn("ACPI NUMA: Failed to add memblk for CFMWS node %d [mem %#llx-%#llx]\n",
+ node, start, end);
+ }
+
+ /* Set the next available fake_pxm value */
+ (*fake_pxm)++;
+ return 0;
+}
+#else
+static int __init acpi_parse_cfmws(union acpi_subtable_headers *header,
+ void *arg, const unsigned long table_end)
+{
+ return 0;
+}
#endif /* defined(CONFIG_X86) || defined (CONFIG_ARM64) */
static int __init acpi_parse_slit(struct acpi_table_header *table)
@@ -442,7 +483,7 @@ acpi_table_parse_srat(enum acpi_srat_type id,
int __init acpi_numa_init(void)
{
- int cnt = 0;
+ int i, fake_pxm, cnt = 0;
if (acpi_disabled)
return -EINVAL;
@@ -478,6 +519,22 @@ int __init acpi_numa_init(void)
/* SLIT: System Locality Information Table */
acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
+ /*
+ * CXL Fixed Memory Window Structures (CFMWS) must be parsed
+ * after the SRAT. Create NUMA Nodes for CXL memory ranges that
+ * are defined in the CFMWS and not already defined in the SRAT.
+ * Initialize a fake_pxm as the first available PXM to emulate.
+ */
+
+ /* fake_pxm is the next unused PXM value after SRAT parsing */
+ for (i = 0, fake_pxm = -1; i < MAX_NUMNODES - 1; i++) {
+ if (node_to_pxm_map[i] > fake_pxm)
+ fake_pxm = node_to_pxm_map[i];
+ }
+ fake_pxm++;
+ acpi_table_parse_cedt(ACPI_CEDT_TYPE_CFMWS, acpi_parse_cfmws,
+ &fake_pxm);
+
if (cnt < 0)
return cnt;
else if (!parsed_numa_memblks)
diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c
index 91e4072e7649..3163167ecc3a 100644
--- a/drivers/cxl/acpi.c
+++ b/drivers/cxl/acpi.c
@@ -125,7 +125,8 @@ static int cxl_parse_cfmws(union acpi_subtable_headers *header, void *arg,
cfmws->base_hpa + cfmws->window_size - 1);
return 0;
}
- dev_dbg(dev, "add: %s range %#llx-%#llx\n", dev_name(&cxld->dev),
+ dev_dbg(dev, "add: %s node: %d range %#llx-%#llx\n",
+ dev_name(&cxld->dev), phys_to_target_node(cxld->range.start),
cfmws->base_hpa, cfmws->base_hpa + cfmws->window_size - 1);
return 0;