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-rw-r--r--drivers/cxl/pci.c36
1 files changed, 33 insertions, 3 deletions
diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
index 47315bb2db10..cf4f593f426e 100644
--- a/drivers/cxl/pci.c
+++ b/drivers/cxl/pci.c
@@ -64,6 +64,15 @@ enum opcode {
CXL_MBOX_OP_MAX = 0x10000
};
+/*
+ * CXL 2.0 - Memory capacity multiplier
+ * See Section 8.2.9.5
+ *
+ * Volatile, Persistent, and Partition capacities are specified to be in
+ * multiples of 256MB - define a multiplier to convert to/from bytes.
+ */
+#define CXL_CAPACITY_MULTIPLIER SZ_256M
+
/**
* struct mbox_cmd - A command to be submitted to hardware.
* @opcode: (input) The command set and command submitted to hardware.
@@ -1350,16 +1359,37 @@ static int cxl_mem_identify(struct cxl_mem *cxlm)
if (rc < 0)
return rc;
+ cxlm->total_bytes = le64_to_cpu(id.total_capacity);
+ cxlm->total_bytes *= CXL_CAPACITY_MULTIPLIER;
+
+ cxlm->volatile_only_bytes = le64_to_cpu(id.volatile_capacity);
+ cxlm->volatile_only_bytes *= CXL_CAPACITY_MULTIPLIER;
+
+ cxlm->persistent_only_bytes = le64_to_cpu(id.persistent_capacity);
+ cxlm->persistent_only_bytes *= CXL_CAPACITY_MULTIPLIER;
+
+ cxlm->partition_align_bytes = le64_to_cpu(id.partition_align);
+ cxlm->partition_align_bytes *= CXL_CAPACITY_MULTIPLIER;
+
+ dev_dbg(&cxlm->pdev->dev, "Identify Memory Device\n"
+ " total_bytes = %#llx\n"
+ " volatile_only_bytes = %#llx\n"
+ " persistent_only_bytes = %#llx\n"
+ " partition_align_bytes = %#llx\n",
+ cxlm->total_bytes,
+ cxlm->volatile_only_bytes,
+ cxlm->persistent_only_bytes,
+ cxlm->partition_align_bytes);
+
/*
* TODO: enumerate DPA map, as 'ram' and 'pmem' do not alias.
* For now, only the capacity is exported in sysfs
*/
cxlm->ram_range.start = 0;
- cxlm->ram_range.end = le64_to_cpu(id.volatile_capacity) * SZ_256M - 1;
+ cxlm->ram_range.end = cxlm->volatile_only_bytes - 1;
cxlm->pmem_range.start = 0;
- cxlm->pmem_range.end =
- le64_to_cpu(id.persistent_capacity) * SZ_256M - 1;
+ cxlm->pmem_range.end = cxlm->persistent_only_bytes - 1;
cxlm->lsa_size = le32_to_cpu(id.lsa_size);
memcpy(cxlm->firmware_version, id.fw_revision, sizeof(id.fw_revision));