@@ -1157,7 +1157,7 @@ int cxl_dev_state_identify(struct cxl_memdev_state *mds)
if (rc < 0)
return rc;
- mds->total_bytes =
+ mds->static_bytes =
le64_to_cpu(id.total_capacity) * CXL_CAPACITY_MULTIPLIER;
mds->volatile_only_bytes =
le64_to_cpu(id.volatile_capacity) * CXL_CAPACITY_MULTIPLIER;
@@ -1264,6 +1264,159 @@ int cxl_mem_sanitize(struct cxl_memdev *cxlmd, u16 cmd)
return rc;
}
+static int cxl_dc_save_region_info(struct cxl_memdev_state *mds, u8 index,
+ struct cxl_dc_region_config *region_config)
+{
+ struct cxl_dc_region_info *dcr = &mds->dc_region[index];
+ struct device *dev = mds->cxlds.dev;
+
+ dcr->base = le64_to_cpu(region_config->region_base);
+ dcr->decode_len = le64_to_cpu(region_config->region_decode_length);
+ dcr->decode_len *= CXL_CAPACITY_MULTIPLIER;
+ dcr->len = le64_to_cpu(region_config->region_length);
+ dcr->blk_size = le64_to_cpu(region_config->region_block_size);
+ dcr->dsmad_handle = le32_to_cpu(region_config->region_dsmad_handle);
+ dcr->flags = region_config->flags;
+ snprintf(dcr->name, CXL_DC_REGION_STRLEN, "dc%d", index);
+
+ /* Check regions are in increasing DPA order */
+ if (index > 0) {
+ struct cxl_dc_region_info *prev_dcr = &mds->dc_region[index - 1];
+
+ if ((prev_dcr->base + prev_dcr->decode_len) > dcr->base) {
+ dev_err(dev,
+ "DPA ordering violation for DC region %d and %d\n",
+ index - 1, index);
+ return -EINVAL;
+ }
+ }
+
+ if (!IS_ALIGNED(dcr->base, SZ_256M) ||
+ !IS_ALIGNED(dcr->base, dcr->blk_size)) {
+ dev_err(dev, "DC region %d invalid base %#llx blk size %#llx\n",
+ index, dcr->base, dcr->blk_size);
+ return -EINVAL;
+ }
+
+ if (dcr->decode_len == 0 || dcr->len == 0 || dcr->decode_len < dcr->len ||
+ !IS_ALIGNED(dcr->len, dcr->blk_size)) {
+ dev_err(dev, "DC region %d invalid length; decode %#llx len %#llx blk size %#llx\n",
+ index, dcr->decode_len, dcr->len, dcr->blk_size);
+ return -EINVAL;
+ }
+
+ if (dcr->blk_size == 0 || dcr->blk_size % CXL_DCD_BLOCK_LINE_SIZE ||
+ !is_power_of_2(dcr->blk_size)) {
+ dev_err(dev, "DC region %d invalid block size; %#llx\n",
+ index, dcr->blk_size);
+ return -EINVAL;
+ }
+
+ dev_dbg(dev,
+ "DC region %s base %#llx length %#llx block size %#llx\n",
+ dcr->name, dcr->base, dcr->decode_len, dcr->blk_size);
+
+ return 0;
+}
+
+/* Returns the number of regions in dc_resp or -ERRNO */
+static int cxl_get_dc_config(struct cxl_memdev_state *mds, u8 start_region,
+ struct cxl_mbox_get_dc_config_out *dc_resp,
+ size_t dc_resp_size)
+{
+ struct cxl_mbox_get_dc_config_in get_dc = (struct cxl_mbox_get_dc_config_in) {
+ .region_count = CXL_MAX_DC_REGION,
+ .start_region_index = start_region,
+ };
+ struct cxl_mbox_cmd mbox_cmd = (struct cxl_mbox_cmd) {
+ .opcode = CXL_MBOX_OP_GET_DC_CONFIG,
+ .payload_in = &get_dc,
+ .size_in = sizeof(get_dc),
+ .size_out = dc_resp_size,
+ .payload_out = dc_resp,
+ .min_out = 1,
+ };
+ struct device *dev = mds->cxlds.dev;
+ int rc;
+
+ rc = cxl_internal_send_cmd(mds, &mbox_cmd);
+ if (rc < 0)
+ return rc;
+
+ dev_dbg(dev, "Read %d/%d DC regions\n",
+ dc_resp->regions_returned, dc_resp->avail_region_count);
+ return dc_resp->regions_returned;
+}
+
+/**
+ * cxl_dev_dynamic_capacity_identify() - Reads the dynamic capacity
+ * information from the device.
+ * @mds: The memory device state
+ *
+ * Read Dynamic Capacity information from the device and populate the state
+ * structures for later use.
+ *
+ * Return: 0 if identify was executed successfully, -ERRNO on error.
+ */
+int cxl_dev_dynamic_capacity_identify(struct cxl_memdev_state *mds)
+{
+ size_t dc_resp_size = mds->payload_size;
+ struct device *dev = mds->cxlds.dev;
+ u8 start_region, i;
+
+ for (i = 0; i < CXL_MAX_DC_REGION; i++)
+ snprintf(mds->dc_region[i].name, CXL_DC_REGION_STRLEN, "<nil>");
+
+ if (!cxl_dcd_supported(mds)) {
+ dev_dbg(dev, "DCD not supported\n");
+ return 0;
+ }
+
+ struct cxl_mbox_get_dc_config_out *dc_resp __free(kfree) =
+ kvmalloc(dc_resp_size, GFP_KERNEL);
+ if (!dc_resp)
+ return -ENOMEM;
+
+ start_region = 0;
+ do {
+ int rc, j;
+
+ rc = cxl_get_dc_config(mds, start_region, dc_resp, dc_resp_size);
+ if (rc < 0) {
+ dev_dbg(dev, "Failed to get DC config: %d\n", rc);
+ return rc;
+ }
+
+ mds->nr_dc_region += rc;
+
+ if (mds->nr_dc_region < 1 || mds->nr_dc_region > CXL_MAX_DC_REGION) {
+ dev_err(dev, "Invalid num of dynamic capacity regions %d\n",
+ mds->nr_dc_region);
+ return -EINVAL;
+ }
+
+ for (i = start_region, j = 0; i < mds->nr_dc_region; i++, j++) {
+ rc = cxl_dc_save_region_info(mds, i, &dc_resp->region[j]);
+ if (rc) {
+ dev_dbg(dev, "Failed to save region info: %d\n", rc);
+ return rc;
+ }
+ }
+
+ start_region = mds->nr_dc_region;
+
+ } while (mds->nr_dc_region < dc_resp->avail_region_count);
+
+ mds->dynamic_bytes =
+ mds->dc_region[mds->nr_dc_region - 1].base +
+ mds->dc_region[mds->nr_dc_region - 1].decode_len -
+ mds->dc_region[0].base;
+ dev_dbg(dev, "Total dynamic range: %#llx\n", mds->dynamic_bytes);
+
+ return 0;
+}
+EXPORT_SYMBOL_NS_GPL(cxl_dev_dynamic_capacity_identify, CXL);
+
static int add_dpa_res(struct device *dev, struct resource *parent,
struct resource *res, resource_size_t start,
resource_size_t size, const char *type)
@@ -1294,8 +1447,15 @@ int cxl_mem_create_range_info(struct cxl_memdev_state *mds)
{
struct cxl_dev_state *cxlds = &mds->cxlds;
struct device *dev = cxlds->dev;
+ size_t untenanted_mem;
int rc;
+ mds->total_bytes = mds->static_bytes;
+ if (mds->nr_dc_region) {
+ untenanted_mem = mds->dc_region[0].base - mds->static_bytes;
+ mds->total_bytes += untenanted_mem + mds->dynamic_bytes;
+ }
+
if (!cxlds->media_ready) {
cxlds->dpa_res = DEFINE_RES_MEM(0, 0);
cxlds->ram_res = DEFINE_RES_MEM(0, 0);
@@ -1305,6 +1465,15 @@ int cxl_mem_create_range_info(struct cxl_memdev_state *mds)
cxlds->dpa_res = DEFINE_RES_MEM(0, mds->total_bytes);
+ for (int i = 0; i < mds->nr_dc_region; i++) {
+ struct cxl_dc_region_info *dcr = &mds->dc_region[i];
+
+ rc = add_dpa_res(dev, &cxlds->dpa_res, &cxlds->dc_res[i],
+ dcr->base, dcr->decode_len, dcr->name);
+ if (rc)
+ return rc;
+ }
+
if (mds->partition_align_bytes == 0) {
rc = add_dpa_res(dev, &cxlds->dpa_res, &cxlds->ram_res, 0,
mds->volatile_only_bytes, "ram");
@@ -402,6 +402,7 @@ enum cxl_devtype {
CXL_DEVTYPE_CLASSMEM,
};
+#define CXL_MAX_DC_REGION 8
/**
* struct cxl_dpa_perf - DPA performance property entry
* @dpa_range: range for DPA address
@@ -431,6 +432,8 @@ struct cxl_dpa_perf {
* @dpa_res: Overall DPA resource tree for the device
* @pmem_res: Active Persistent memory capacity configuration
* @ram_res: Active Volatile memory capacity configuration
+ * @dc_res: Active Dynamic Capacity memory configuration for each possible
+ * region
* @serial: PCIe Device Serial Number
* @type: Generic Memory Class device or Vendor Specific Memory device
*/
@@ -445,10 +448,22 @@ struct cxl_dev_state {
struct resource dpa_res;
struct resource pmem_res;
struct resource ram_res;
+ struct resource dc_res[CXL_MAX_DC_REGION];
u64 serial;
enum cxl_devtype type;
};
+#define CXL_DC_REGION_STRLEN 8
+struct cxl_dc_region_info {
+ u64 base;
+ u64 decode_len;
+ u64 len;
+ u64 blk_size;
+ u32 dsmad_handle;
+ u8 flags;
+ u8 name[CXL_DC_REGION_STRLEN];
+};
+
/**
* struct cxl_memdev_state - Generic Type-3 Memory Device Class driver data
*
@@ -466,7 +481,9 @@ struct cxl_dev_state {
* @dcd_cmds: List of DCD commands implemented by memory device
* @enabled_cmds: Hardware commands found enabled in CEL.
* @exclusive_cmds: Commands that are kernel-internal only
- * @total_bytes: sum of all possible capacities
+ * @total_bytes: length of all possible capacities
+ * @static_bytes: length of possible static RAM and PMEM partitions
+ * @dynamic_bytes: length of possible DC partitions (DC Regions)
* @volatile_only_bytes: hard volatile capacity
* @persistent_only_bytes: hard persistent capacity
* @partition_align_bytes: alignment size for partition-able capacity
@@ -476,6 +493,8 @@ struct cxl_dev_state {
* @next_persistent_bytes: persistent capacity change pending device reset
* @ram_perf: performance data entry matched to RAM partition
* @pmem_perf: performance data entry matched to PMEM partition
+ * @nr_dc_region: number of DC regions implemented in the memory device
+ * @dc_region: array containing info about the DC regions
* @event: event log driver state
* @poison: poison driver state info
* @security: security driver state info
@@ -496,6 +515,8 @@ struct cxl_memdev_state {
DECLARE_BITMAP(enabled_cmds, CXL_MEM_COMMAND_ID_MAX);
DECLARE_BITMAP(exclusive_cmds, CXL_MEM_COMMAND_ID_MAX);
u64 total_bytes;
+ u64 static_bytes;
+ u64 dynamic_bytes;
u64 volatile_only_bytes;
u64 persistent_only_bytes;
u64 partition_align_bytes;
@@ -507,6 +528,9 @@ struct cxl_memdev_state {
struct cxl_dpa_perf ram_perf;
struct cxl_dpa_perf pmem_perf;
+ u8 nr_dc_region;
+ struct cxl_dc_region_info dc_region[CXL_MAX_DC_REGION];
+
struct cxl_event_state event;
struct cxl_poison_state poison;
struct cxl_security_state security;
@@ -709,6 +733,32 @@ struct cxl_mbox_set_partition_info {
#define CXL_SET_PARTITION_IMMEDIATE_FLAG BIT(0)
+/* See CXL 3.1 Table 8-163 get dynamic capacity config Input Payload */
+struct cxl_mbox_get_dc_config_in {
+ u8 region_count;
+ u8 start_region_index;
+} __packed;
+
+/* See CXL 3.1 Table 8-164 get dynamic capacity config Output Payload */
+struct cxl_mbox_get_dc_config_out {
+ u8 avail_region_count;
+ u8 regions_returned;
+ u8 rsvd[6];
+ /* See CXL 3.1 Table 8-165 */
+ struct cxl_dc_region_config {
+ __le64 region_base;
+ __le64 region_decode_length;
+ __le64 region_length;
+ __le64 region_block_size;
+ __le32 region_dsmad_handle;
+ u8 flags;
+ u8 rsvd[3];
+ } __packed region[];
+ /* Trailing fields unused */
+} __packed;
+#define CXL_DYNAMIC_CAPACITY_SANITIZE_ON_RELEASE_FLAG BIT(0)
+#define CXL_DCD_BLOCK_LINE_SIZE 0x40
+
/* Set Timestamp CXL 3.0 Spec 8.2.9.4.2 */
struct cxl_mbox_set_timestamp_in {
__le64 timestamp;
@@ -832,6 +882,7 @@ enum {
int cxl_internal_send_cmd(struct cxl_memdev_state *mds,
struct cxl_mbox_cmd *cmd);
int cxl_dev_state_identify(struct cxl_memdev_state *mds);
+int cxl_dev_dynamic_capacity_identify(struct cxl_memdev_state *mds);
int cxl_await_media_ready(struct cxl_dev_state *cxlds);
int cxl_enumerate_cmds(struct cxl_memdev_state *mds);
int cxl_mem_create_range_info(struct cxl_memdev_state *mds);
@@ -845,6 +896,17 @@ void cxl_event_trace_record(const struct cxl_memdev *cxlmd,
enum cxl_event_log_type type,
enum cxl_event_type event_type,
const uuid_t *uuid, union cxl_event *evt);
+
+static inline bool cxl_dcd_supported(struct cxl_memdev_state *mds)
+{
+ return test_bit(CXL_DCD_ENABLED_GET_CONFIG, mds->dcd_cmds);
+}
+
+static inline void cxl_disable_dcd(struct cxl_memdev_state *mds)
+{
+ clear_bit(CXL_DCD_ENABLED_GET_CONFIG, mds->dcd_cmds);
+}
+
int cxl_set_timestamp(struct cxl_memdev_state *mds);
int cxl_poison_state_init(struct cxl_memdev_state *mds);
int cxl_mem_get_poison(struct cxl_memdev *cxlmd, u64 offset, u64 len,
@@ -874,6 +874,10 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
if (rc)
return rc;
+ rc = cxl_dev_dynamic_capacity_identify(mds);
+ if (rc)
+ cxl_disable_dcd(mds);
+
rc = cxl_mem_create_range_info(mds);
if (rc)
return rc;