Per the CXL specification (8.1.12.2 Memory Device PCIe Capabilities and Extended Capabilities) the Device Serial Number capability is mandatory. Emit it for user tooling to identify devices.
Signed-off-by: Dan Williams <[email protected]> --- Documentation/ABI/testing/sysfs-bus-cxl | 9 +++++++++ drivers/cxl/core/memdev.c | 11 +++++++++++ drivers/cxl/cxlmem.h | 2 ++ drivers/cxl/pci.c | 1 + tools/testing/cxl/test/mem.c | 1 + 5 files changed, 24 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-cxl b/Documentation/ABI/testing/sysfs-bus-cxl index 6d8cbf3355b5..87c0e5e65322 100644 --- a/Documentation/ABI/testing/sysfs-bus-cxl +++ b/Documentation/ABI/testing/sysfs-bus-cxl @@ -25,6 +25,15 @@ Description: identically named field in the Identify Memory Device Output Payload in the CXL-2.0 specification. +What: /sys/bus/cxl/devices/memX/serial +Date: January, 2022 +KernelVersion: v5.18 +Contact: [email protected] +Description: + (RO) 64-bit serial number per the PCIe Device Serial Number + capability. Mandatory for CXL devices, see CXL 2.0 8.1.12.2 + Memory Device PCIe Capabilities and Extended Capabilities. + What: /sys/bus/cxl/devices/*/devtype Date: June, 2021 KernelVersion: v5.14 diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c index 61029cb7ac62..1e574b052583 100644 --- a/drivers/cxl/core/memdev.c +++ b/drivers/cxl/core/memdev.c @@ -89,7 +89,18 @@ static ssize_t pmem_size_show(struct device *dev, struct device_attribute *attr, static struct device_attribute dev_attr_pmem_size = __ATTR(size, 0444, pmem_size_show, NULL); +static ssize_t serial_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct cxl_memdev *cxlmd = to_cxl_memdev(dev); + struct cxl_dev_state *cxlds = cxlmd->cxlds; + + return sysfs_emit(buf, "%#llx\n", cxlds->serial); +} +static DEVICE_ATTR_RO(serial); + static struct attribute *cxl_memdev_attributes[] = { + &dev_attr_serial.attr, &dev_attr_firmware_version.attr, &dev_attr_payload_max.attr, &dev_attr_label_storage_size.attr, diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h index e70838e5dc17..0ba0cf8dcdbc 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -131,6 +131,7 @@ struct cxl_endpoint_dvsec_info { * @next_persistent_bytes: persistent capacity change pending device reset * @component_reg_phys: register base of component registers * @info: Cached DVSEC information about the device. + * @serial: PCIe Device Serial Number * @mbox_send: @dev specific transport for transmitting mailbox commands * @wait_media_ready: @dev specific method to await media ready * @@ -164,6 +165,7 @@ struct cxl_dev_state { resource_size_t component_reg_phys; struct cxl_endpoint_dvsec_info info; + u64 serial; int (*mbox_send)(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *cmd); int (*wait_media_ready)(struct cxl_dev_state *cxlds); diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c index 513cb0e2a70a..9252e1f4b18c 100644 --- a/drivers/cxl/pci.c +++ b/drivers/cxl/pci.c @@ -557,6 +557,7 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) if (IS_ERR(cxlds)) return PTR_ERR(cxlds); + cxlds->serial = pci_get_dsn(pdev); cxlds->cxl_dvsec = pci_find_dvsec_capability( pdev, PCI_DVSEC_VENDOR_ID_CXL, CXL_DVSEC); if (!cxlds->cxl_dvsec) { diff --git a/tools/testing/cxl/test/mem.c b/tools/testing/cxl/test/mem.c index 3af3f94de0c3..36ef337c775c 100644 --- a/tools/testing/cxl/test/mem.c +++ b/tools/testing/cxl/test/mem.c @@ -268,6 +268,7 @@ static int cxl_mock_mem_probe(struct platform_device *pdev) if (IS_ERR(cxlds)) return PTR_ERR(cxlds); + cxlds->serial = pdev->id; cxlds->mbox_send = cxl_mock_mbox_send; cxlds->wait_media_ready = cxl_mock_wait_media_ready; cxlds->payload_size = SZ_4K;
