libnvdimm/nfit_test: adding support for unit testing enable LSS status

Adding support code to simulate the enabling of LSS status in support of
the Intel DSM v1.6 Function Index 10: Enable Latch System Shutdown Status.
This is only for testing of libndctl support for LSS enable. The actual
functionality requires a reboot and therefore is not simulated. The enable
value is not recorded in nfit_test since there's no DSM to actually query
the current status of the LSS enable.

Signed-off-by: Dave Jiang <[e-mail]>
Reviewed-by: Vishal Verma <[e-mail]>
Signed-off-by: Dan Williams <[e-mail]>

tools/testing/nvdimm/test/nfit.c

···
 	return 0;
 }
 
+static int nd_intel_test_cmd_set_lss_status(struct nfit_test *t,
+		struct nd_intel_lss *nd_cmd, unsigned int buf_len)
+{
+	struct device *dev = &t->pdev.dev;
+
+	if (buf_len < sizeof(*nd_cmd))
+		return -EINVAL;
+
+	switch (nd_cmd->enable) {
+	case 0:
+		nd_cmd->status = 0;
+		dev_dbg(dev, "%s: Latch System Shutdown Status disabled\n",
+				__func__);
+		break;
+	case 1:
+		nd_cmd->status = 0;
+		dev_dbg(dev, "%s: Latch System Shutdown Status enabled\n",
+				__func__);
+		break;
+	default:
+		dev_warn(dev, "Unknown enable value: %#x\n", nd_cmd->enable);
+		nd_cmd->status = 0x3;
+		break;
+	}
+
+
+	return 0;
+}
+
 static int get_dimm(struct nfit_mem *nfit_mem, unsigned int func)
 {
 	int i;
···
 				return i;
 
 			switch (func) {
+			case ND_INTEL_ENABLE_LSS_STATUS:
+				return nd_intel_test_cmd_set_lss_status(t,
+						buf, buf_len);
 			case ND_INTEL_FW_GET_INFO:
 				return nd_intel_test_get_fw_info(t, buf,
 						buf_len, i - t->dcr_idx);
···
 	set_bit(ND_INTEL_FW_SEND_DATA, &acpi_desc->dimm_cmd_force_en);
 	set_bit(ND_INTEL_FW_FINISH_UPDATE, &acpi_desc->dimm_cmd_force_en);
 	set_bit(ND_INTEL_FW_FINISH_QUERY, &acpi_desc->dimm_cmd_force_en);
+	set_bit(ND_INTEL_ENABLE_LSS_STATUS, &acpi_desc->dimm_cmd_force_en);
 }
 
 static void nfit_test1_setup(struct nfit_test *t)
···
 	set_bit(ND_CMD_ARS_START, &acpi_desc->bus_cmd_force_en);
 	set_bit(ND_CMD_ARS_STATUS, &acpi_desc->bus_cmd_force_en);
 	set_bit(ND_CMD_CLEAR_ERROR, &acpi_desc->bus_cmd_force_en);
+	set_bit(ND_INTEL_ENABLE_LSS_STATUS, &acpi_desc->dimm_cmd_force_en);
 }
 
 static int nfit_test_blk_do_io(struct nd_blk_region *ndbr, resource_size_t dpa,

tools/testing/nvdimm/test/nfit_test.h

···
 
 #define ND_INTEL_SMART			 1
 #define ND_INTEL_SMART_THRESHOLD	 2
+#define ND_INTEL_ENABLE_LSS_STATUS	10
 #define ND_INTEL_FW_GET_INFO		12
 #define ND_INTEL_FW_START_UPDATE	13
 #define ND_INTEL_FW_SEND_DATA		14
···
 	__u32 context;
 	__u32 status;
 	__u64 updated_fw_rev;
+} __packed;
+
+struct nd_intel_lss {
+	__u8 enable;
+	__u32 status;
 } __packed;
 
 union acpi_object;