acpi, nfit: Introduce nfit_mem flags

In preparation for adding a flag to indicate whether a DIMM publishes a
dirty-shutdown count, convert the existing flags to a bit field.
Reviewed-by: NKeith Busch <keith.busch@intel.com>
Signed-off-by: NDan Williams <dan.j.williams@intel.com>

drivers/acpi/nfit/core.c

@@ -191,18 +191,20 @@ static int xlat_nvdimm_status(struct nvdimm *nvdimm, void *buf, unsigned int cmd
 		 * In the _LSI, _LSR, _LSW case the locked status is
 		 * communicated via the read/write commands
 		 */
-		if (nfit_mem->has_lsr)
+		if (test_bit(NFIT_MEM_LSR, &nfit_mem->flags))
 			break;
 
 		if (status >> 16 & ND_CONFIG_LOCKED)
 			return -EACCES;
 		break;
 	case ND_CMD_GET_CONFIG_DATA:
-		if (nfit_mem->has_lsr && status == ACPI_LABELS_LOCKED)
+		if (test_bit(NFIT_MEM_LSR, &nfit_mem->flags)
+				&& status == ACPI_LABELS_LOCKED)
 			return -EACCES;
 		break;
 	case ND_CMD_SET_CONFIG_DATA:
-		if (nfit_mem->has_lsw && status == ACPI_LABELS_LOCKED)
+		if (test_bit(NFIT_MEM_LSW, &nfit_mem->flags)
+				&& status == ACPI_LABELS_LOCKED)
 			return -EACCES;
 		break;
 	default:
@@ -480,14 +482,16 @@ int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,
 			min_t(u32, 256, in_buf.buffer.length), true);
 
 	/* call the BIOS, prefer the named methods over _DSM if available */
-	if (nvdimm && cmd == ND_CMD_GET_CONFIG_SIZE && nfit_mem->has_lsr)
+	if (nvdimm && cmd == ND_CMD_GET_CONFIG_SIZE
+			&& test_bit(NFIT_MEM_LSR, &nfit_mem->flags))
 		out_obj = acpi_label_info(handle);
-	else if (nvdimm && cmd == ND_CMD_GET_CONFIG_DATA && nfit_mem->has_lsr) {
+	else if (nvdimm && cmd == ND_CMD_GET_CONFIG_DATA
+			&& test_bit(NFIT_MEM_LSR, &nfit_mem->flags)) {
 		struct nd_cmd_get_config_data_hdr *p = buf;
 
 		out_obj = acpi_label_read(handle, p->in_offset, p->in_length);
 	} else if (nvdimm && cmd == ND_CMD_SET_CONFIG_DATA
-			&& nfit_mem->has_lsw) {
+			&& test_bit(NFIT_MEM_LSW, &nfit_mem->flags)) {
 		struct nd_cmd_set_config_hdr *p = buf;
 
 		out_obj = acpi_label_write(handle, p->in_offset, p->in_length,
@@ -1784,12 +1788,13 @@ static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
 	if (acpi_nvdimm_has_method(adev_dimm, "_LSI")
 			&& acpi_nvdimm_has_method(adev_dimm, "_LSR")) {
 		dev_dbg(dev, "%s: has _LSR\n", dev_name(&adev_dimm->dev));
-		nfit_mem->has_lsr = true;
+		set_bit(NFIT_MEM_LSR, &nfit_mem->flags);
 	}
 
-	if (nfit_mem->has_lsr && acpi_nvdimm_has_method(adev_dimm, "_LSW")) {
+	if (test_bit(NFIT_MEM_LSR, &nfit_mem->flags)
+			&& acpi_nvdimm_has_method(adev_dimm, "_LSW")) {
 		dev_dbg(dev, "%s: has _LSW\n", dev_name(&adev_dimm->dev));
-		nfit_mem->has_lsw = true;
+		set_bit(NFIT_MEM_LSW, &nfit_mem->flags);
 	}
 
 	return 0;
@@ -1878,11 +1883,11 @@ static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
 			cmd_mask |= nfit_mem->dsm_mask & NVDIMM_STANDARD_CMDMASK;
 		}
 
-		if (nfit_mem->has_lsr) {
+		if (test_bit(NFIT_MEM_LSR, &nfit_mem->flags)) {
 			set_bit(ND_CMD_GET_CONFIG_SIZE, &cmd_mask);
 			set_bit(ND_CMD_GET_CONFIG_DATA, &cmd_mask);
 		}
-		if (nfit_mem->has_lsw)
+		if (test_bit(NFIT_MEM_LSW, &nfit_mem->flags))
 			set_bit(ND_CMD_SET_CONFIG_DATA, &cmd_mask);
 
 		flush = nfit_mem->nfit_flush ? nfit_mem->nfit_flush->flush

drivers/acpi/nfit/nfit.h

@@ -159,6 +159,11 @@ struct nfit_memdev {
 	struct acpi_nfit_memory_map memdev[0];
 };
 
+enum nfit_mem_flags {
+	NFIT_MEM_LSR,
+	NFIT_MEM_LSW,
+};
+
 /* assembled tables for a given dimm/memory-device */
 struct nfit_mem {
 	struct nvdimm *nvdimm;
@@ -178,9 +183,8 @@ struct nfit_mem {
 	struct acpi_nfit_desc *acpi_desc;
 	struct resource *flush_wpq;
 	unsigned long dsm_mask;
+	unsigned long flags;
 	int family;
-	bool has_lsr;
-	bool has_lsw;
 };
 
 struct acpi_nfit_desc {