linux-kernel - [PATCH v3 6/6] tools/testing/cxl: Mock the Get Poison List mbox command

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Date:   Thu, 10 Nov 2022 19:12:44 -0800
From:   alison.schofield@...el.com
To:     Dan Williams <dan.j.williams@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     Alison Schofield <alison.schofield@...el.com>,
        linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 6/6] tools/testing/cxl: Mock the Get Poison List mbox command

From: Alison Schofield <alison.schofield@...el.com>

Return fake poison error records when the get poison list mbox
command is issued. This supports testing the kernel tracing
and cxl list capabilities for media errors.

Signed-off-by: Alison Schofield <alison.schofield@...el.com>
---
 tools/testing/cxl/test/mem.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/tools/testing/cxl/test/mem.c b/tools/testing/cxl/test/mem.c
index f0704d090073..f729e055605d 100644
--- a/tools/testing/cxl/test/mem.c
+++ b/tools/testing/cxl/test/mem.c
@@ -38,6 +38,10 @@ static struct cxl_cel_entry mock_cel[] = {
 		.opcode = cpu_to_le16(CXL_MBOX_OP_GET_HEALTH_INFO),
 		.effect = cpu_to_le16(0),
 	},
+	{
+		.opcode = cpu_to_le16(CXL_MBOX_OP_GET_POISON),
+		.effect = cpu_to_le16(0),
+	},
 };
 
 /* See CXL 2.0 Table 181 Get Health Info Output Payload */
@@ -207,6 +211,30 @@ static int mock_health_info(struct cxl_dev_state *cxlds,
 	return 0;
 }
 
+static int mock_get_poison(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *cmd)
+{
+	struct {
+		struct cxl_mbox_poison_payload_out poison_out;
+		struct cxl_poison_record record;
+	} mock_poison_list = {
+		.poison_out = {
+			.count = cpu_to_le16(1),
+		},
+		.record = {
+			/* .address encodes DPA and poison source bits */
+			.address = cpu_to_le64(CXL_POISON_SOURCE_INTERNAL),
+			.length = cpu_to_le32(1),
+		},
+	};
+
+	if (cmd->size_out < sizeof(mock_poison_list))
+		return -EINVAL;
+
+	memcpy(cmd->payload_out, &mock_poison_list, sizeof(mock_poison_list));
+	cmd->size_out = sizeof(mock_poison_list);
+	return 0;
+}
+
 static int cxl_mock_mbox_send(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *cmd)
 {
 	struct device *dev = cxlds->dev;
@@ -234,6 +262,9 @@ static int cxl_mock_mbox_send(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *
 	case CXL_MBOX_OP_GET_HEALTH_INFO:
 		rc = mock_health_info(cxlds, cmd);
 		break;
+	case CXL_MBOX_OP_GET_POISON:
+		rc = mock_get_poison(cxlds, cmd);
+		break;
 	default:
 		break;
 	}
-- 
2.37.3