On 21/2/20 2:27 pm, Alastair D'Silva wrote:

+/**
+ * read_device_metadata() - Retrieve config information from the AFU and save it for future use
+ * @ocxlpmem: the device metadata
+ * Return: 0 on success, negative on failure
+ */
+static int read_device_metadata(struct ocxlpmem *ocxlpmem)
+{
+	u64 val;
+	int rc;
+
+	rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_CCAP0,
+				     OCXL_LITTLE_ENDIAN, &val);
+	if (rc)
+		return rc;
+
+	ocxlpmem->scm_revision = val & 0xFFFF;
+	ocxlpmem->read_latency = (val >> 32) & 0xFF;

This field is 16 bits in the spec, so the mask should be 0xFFFF I think?

Maybe we should generalise the EXTRACT_BITS macro we use in ocxl :)

-- 
Andrew Donnellan              OzLabs, ADL Canberra
ajd@linux.ibm.com             IBM Australia Limited