tools/testing/cxl: Add partition support

In support of testing DPA allocation mechanisms in the CXL core, the
cxl_test environment needs to support establishing and retrieving the
'pmem partition boundary.

Replace the platform_device_add_resources() method for delineating DPA
within an endpoint with an emulated DEV_SIZE amount of partitionable
capacity. Set DEV_SIZE such that an endpoint has enough capacity to
simultaneously participate in 8 distinct regions.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/165603887411.551046.13234212587991192347.stgit@dwillia2-xfh
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 27 insertions, 24 deletions

diff --git a/tools/testing/cxl/test/mem.c b/tools/testing/cxl/test/mem.c
index b81c90715fe8..aa2df3a15051 100644
--- a/tools/testing/cxl/test/mem.c
+++ b/tools/testing/cxl/test/mem.c
@@ -10,6 +10,7 @@
 #include <cxlmem.h>
 
 #define LSA_SIZE SZ_128K
+#define DEV_SIZE SZ_2G
 #define EFFECT(x) (1U << x)
 
 static struct cxl_cel_entry mock_cel[] = {
@@ -26,6 +27,10 @@ static struct cxl_cel_entry mock_cel[] = {
 		.effect = cpu_to_le16(0),
 	},
 	{
+		.opcode = cpu_to_le16(CXL_MBOX_OP_GET_PARTITION_INFO),
+		.effect = cpu_to_le16(0),
+	},
+	{
 		.opcode = cpu_to_le16(CXL_MBOX_OP_SET_LSA),
 		.effect = cpu_to_le16(EFFECT(1) | EFFECT(2)),
 	},
@@ -97,42 +102,37 @@ static int mock_get_log(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *cmd)
 
 static int mock_id(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *cmd)
 {
-	struct platform_device *pdev = to_platform_device(cxlds->dev);
 	struct cxl_mbox_identify id = {
 		.fw_revision = { "mock fw v1 " },
 		.lsa_size = cpu_to_le32(LSA_SIZE),
-		/* FIXME: Add partition support */
-		.partition_align = cpu_to_le64(0),
+		.partition_align =
+			cpu_to_le64(SZ_256M / CXL_CAPACITY_MULTIPLIER),
+		.total_capacity =
+			cpu_to_le64(DEV_SIZE / CXL_CAPACITY_MULTIPLIER),
 	};
-	u64 capacity = 0;
-	int i;
 
 	if (cmd->size_out < sizeof(id))
 		return -EINVAL;
 
-	for (i = 0; i < 2; i++) {
-		struct resource *res;
-
-		res = platform_get_resource(pdev, IORESOURCE_MEM, i);
-		if (!res)
-			break;
-
-		capacity += resource_size(res) / CXL_CAPACITY_MULTIPLIER;
+	memcpy(cmd->payload_out, &id, sizeof(id));
 
-		if (le64_to_cpu(id.partition_align))
-			continue;
+	return 0;
+}
 
-		if (res->desc == IORES_DESC_PERSISTENT_MEMORY)
-			id.persistent_capacity = cpu_to_le64(
-				resource_size(res) / CXL_CAPACITY_MULTIPLIER);
-		else
-			id.volatile_capacity = cpu_to_le64(
-				resource_size(res) / CXL_CAPACITY_MULTIPLIER);
-	}
+static int mock_partition_info(struct cxl_dev_state *cxlds,
+			       struct cxl_mbox_cmd *cmd)
+{
+	struct cxl_mbox_get_partition_info pi = {
+		.active_volatile_cap =
+			cpu_to_le64(DEV_SIZE / 2 / CXL_CAPACITY_MULTIPLIER),
+		.active_persistent_cap =
+			cpu_to_le64(DEV_SIZE / 2 / CXL_CAPACITY_MULTIPLIER),
+	};
 
-	id.total_capacity = cpu_to_le64(capacity);
+	if (cmd->size_out < sizeof(pi))
+		return -EINVAL;
 
-	memcpy(cmd->payload_out, &id, sizeof(id));
+	memcpy(cmd->payload_out, &pi, sizeof(pi));
 
 	return 0;
 }
@@ -221,6 +221,9 @@ static int cxl_mock_mbox_send(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *
 	case CXL_MBOX_OP_GET_LSA:
 		rc = mock_get_lsa(cxlds, cmd);
 		break;
+	case CXL_MBOX_OP_GET_PARTITION_INFO:
+		rc = mock_partition_info(cxlds, cmd);
+		break;
 	case CXL_MBOX_OP_SET_LSA:
 		rc = mock_set_lsa(cxlds, cmd);
 		break;