cxl/test: Add support for acpi extended linear cache

Add the mock wrappers for hmat_get_extended_linear_cache_size() in order
to emulate the ACPI helper function for the regions that are mock'd by
cxl_test.

Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Tested-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Fabio M. De Francesco <fabio.m.de.francesco@linux.intel.com>
Link: https://patch.msgid.link/20251117144611.903692-4-dave.jiang@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

Author: davejiang

tools/testing/cxl/Kbuild

@@ -11,6 +11,7 @@ ldflags-y += --wrap=cxl_rcd_component_reg_phys
 ldflags-y += --wrap=cxl_endpoint_parse_cdat
 ldflags-y += --wrap=cxl_dport_init_ras_reporting
 ldflags-y += --wrap=devm_cxl_endpoint_decoders_setup
+ldflags-y += --wrap=hmat_get_extended_linear_cache_size
 
 DRIVERS := ../../../drivers
 CXL_SRC := $(DRIVERS)/cxl

tools/testing/cxl/test/cxl.c

@@ -612,6 +612,25 @@ mock_acpi_evaluate_integer(acpi_handle handle, acpi_string pathname,
 	return AE_OK;
 }
 
+static int
+mock_hmat_get_extended_linear_cache_size(struct resource *backing_res,
+					 int nid, resource_size_t *cache_size)
+{
+	struct acpi_cedt_cfmws *window = mock_cfmws[0];
+	struct resource cfmws0_res =
+		DEFINE_RES_MEM(window->base_hpa, window->window_size);
+
+	if (!extended_linear_cache ||
+	    !resource_contains(&cfmws0_res, backing_res)) {
+		return hmat_get_extended_linear_cache_size(backing_res,
+							   nid, cache_size);
+	}
+
+	*cache_size = mock_auto_region_size;
+
+	return 0;
+}
+
 static struct pci_bus mock_pci_bus[NR_BRIDGES];
 static struct acpi_pci_root mock_pci_root[ARRAY_SIZE(mock_pci_bus)] = {
 	[0] = {
@@ -1140,6 +1159,8 @@ static struct cxl_mock_ops cxl_mock_ops = {
 	.devm_cxl_port_enumerate_dports = mock_cxl_port_enumerate_dports,
 	.cxl_endpoint_parse_cdat = mock_cxl_endpoint_parse_cdat,
 	.devm_cxl_add_dport_by_dev = mock_cxl_add_dport_by_dev,
+	.hmat_get_extended_linear_cache_size =
+		mock_hmat_get_extended_linear_cache_size,
 	.list = LIST_HEAD_INIT(cxl_mock_ops.list),
 };
 

tools/testing/cxl/test/mock.c

@@ -111,6 +111,26 @@ acpi_status __wrap_acpi_evaluate_integer(acpi_handle handle,
 }
 EXPORT_SYMBOL(__wrap_acpi_evaluate_integer);
 
+int __wrap_hmat_get_extended_linear_cache_size(struct resource *backing_res,
+					       int nid,
+					       resource_size_t *cache_size)
+{
+	int index, rc;
+	struct cxl_mock_ops *ops = get_cxl_mock_ops(&index);
+
+	if (ops)
+		rc = ops->hmat_get_extended_linear_cache_size(backing_res, nid,
+							      cache_size);
+	else
+		rc = hmat_get_extended_linear_cache_size(backing_res, nid,
+							 cache_size);
+
+	put_cxl_mock_ops(index);
+
+	return rc;
+}
+EXPORT_SYMBOL_GPL(__wrap_hmat_get_extended_linear_cache_size);
+
 struct acpi_pci_root *__wrap_acpi_pci_find_root(acpi_handle handle)
 {
 	int index;

tools/testing/cxl/test/mock.h

@@ -25,6 +25,9 @@ struct cxl_mock_ops {
 	void (*cxl_endpoint_parse_cdat)(struct cxl_port *port);
 	struct cxl_dport *(*devm_cxl_add_dport_by_dev)(struct cxl_port *port,
 						       struct device *dport_dev);
+	int (*hmat_get_extended_linear_cache_size)(struct resource *backing_res,
+						   int nid,
+						   resource_size_t *cache_size);
 };
 
 void register_cxl_mock_ops(struct cxl_mock_ops *ops);