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authorIra Weiny <ira.weiny@intel.com>2021-08-10 11:57:59 -0700
committerDan Williams <dan.j.williams@intel.com>2021-08-10 11:57:59 -0700
commitf847502ad8e3299e7ad256aa0bd7eaf184646117 (patch)
treec36f2992630f1d6ec8bd6c12ccd926af02e00a41 /drivers/cxl
parent0b9159d0ff21bc281dbb9ede06ad566330ac0943 (diff)
cxl/mem: Account for partitionable space in ram/pmem ranges
Memory devices may specify volatile only, persistent only, and partitionable space which when added together result in a total capacity. If Identify Memory Device.Partition Alignment != 0 the device supports partitionable space. This partitionable space can be split between volatile and persistent space. The total volatile and persistent sizes are reported in Get Partition Info. ie active volatile memory = volatile only + partitionable volatile active persistent memory = persistent only + partitionable persistent Define cxl_mem_get_partition(), check for partitionable support, and use cxl_mem_get_partition() if applicable. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Ira Weiny <ira.weiny@intel.com> Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/cxl')
-rw-r--r--drivers/cxl/cxlmem.h5
-rw-r--r--drivers/cxl/pci.c96
2 files changed, 96 insertions, 5 deletions
diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
index 22344fda8ca5..6c0b1e2ea97c 100644
--- a/drivers/cxl/cxlmem.h
+++ b/drivers/cxl/cxlmem.h
@@ -99,5 +99,10 @@ struct cxl_mem {
u64 volatile_only_bytes;
u64 persistent_only_bytes;
u64 partition_align_bytes;
+
+ u64 active_volatile_bytes;
+ u64 active_persistent_bytes;
+ u64 next_volatile_bytes;
+ u64 next_persistent_bytes;
};
#endif /* __CXL_MEM_H__ */
diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
index cf4f593f426e..3f5db8960098 100644
--- a/drivers/cxl/pci.c
+++ b/drivers/cxl/pci.c
@@ -1264,6 +1264,53 @@ static struct cxl_mbox_get_supported_logs *cxl_get_gsl(struct cxl_mem *cxlm)
}
/**
+ * cxl_mem_get_partition_info - Get partition info
+ * @cxlm: The device to act on
+ * @active_volatile_bytes: returned active volatile capacity
+ * @active_persistent_bytes: returned active persistent capacity
+ * @next_volatile_bytes: return next volatile capacity
+ * @next_persistent_bytes: return next persistent capacity
+ *
+ * Retrieve the current partition info for the device specified. If not 0, the
+ * 'next' values are pending and take affect on next cold reset.
+ *
+ * Return: 0 if no error: or the result of the mailbox command.
+ *
+ * See CXL @8.2.9.5.2.1 Get Partition Info
+ */
+static int cxl_mem_get_partition_info(struct cxl_mem *cxlm,
+ u64 *active_volatile_bytes,
+ u64 *active_persistent_bytes,
+ u64 *next_volatile_bytes,
+ u64 *next_persistent_bytes)
+{
+ struct cxl_mbox_get_partition_info {
+ __le64 active_volatile_cap;
+ __le64 active_persistent_cap;
+ __le64 next_volatile_cap;
+ __le64 next_persistent_cap;
+ } __packed pi;
+ int rc;
+
+ rc = cxl_mem_mbox_send_cmd(cxlm, CXL_MBOX_OP_GET_PARTITION_INFO,
+ NULL, 0, &pi, sizeof(pi));
+ if (rc)
+ return rc;
+
+ *active_volatile_bytes = le64_to_cpu(pi.active_volatile_cap);
+ *active_persistent_bytes = le64_to_cpu(pi.active_persistent_cap);
+ *next_volatile_bytes = le64_to_cpu(pi.next_volatile_cap);
+ *next_persistent_bytes = le64_to_cpu(pi.next_volatile_cap);
+
+ *active_volatile_bytes *= CXL_CAPACITY_MULTIPLIER;
+ *active_persistent_bytes *= CXL_CAPACITY_MULTIPLIER;
+ *next_volatile_bytes *= CXL_CAPACITY_MULTIPLIER;
+ *next_persistent_bytes *= CXL_CAPACITY_MULTIPLIER;
+
+ return 0;
+}
+
+/**
* cxl_mem_enumerate_cmds() - Enumerate commands for a device.
* @cxlm: The device.
*
@@ -1381,18 +1428,53 @@ static int cxl_mem_identify(struct cxl_mem *cxlm)
cxlm->persistent_only_bytes,
cxlm->partition_align_bytes);
+ cxlm->lsa_size = le32_to_cpu(id.lsa_size);
+ memcpy(cxlm->firmware_version, id.fw_revision, sizeof(id.fw_revision));
+
+ return 0;
+}
+
+static int cxl_mem_create_range_info(struct cxl_mem *cxlm)
+{
+ int rc;
+
+ if (cxlm->partition_align_bytes == 0) {
+ cxlm->ram_range.start = 0;
+ cxlm->ram_range.end = cxlm->volatile_only_bytes - 1;
+ cxlm->pmem_range.start = 0;
+ cxlm->pmem_range.end = cxlm->persistent_only_bytes - 1;
+ return 0;
+ }
+
+ rc = cxl_mem_get_partition_info(cxlm,
+ &cxlm->active_volatile_bytes,
+ &cxlm->active_persistent_bytes,
+ &cxlm->next_volatile_bytes,
+ &cxlm->next_persistent_bytes);
+ if (rc < 0) {
+ dev_err(&cxlm->pdev->dev, "Failed to query partition information\n");
+ return rc;
+ }
+
+ dev_dbg(&cxlm->pdev->dev, "Get Partition Info\n"
+ " active_volatile_bytes = %#llx\n"
+ " active_persistent_bytes = %#llx\n"
+ " next_volatile_bytes = %#llx\n"
+ " next_persistent_bytes = %#llx\n",
+ cxlm->active_volatile_bytes,
+ cxlm->active_persistent_bytes,
+ cxlm->next_volatile_bytes,
+ cxlm->next_persistent_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 = cxlm->volatile_only_bytes - 1;
+ cxlm->ram_range.end = cxlm->active_volatile_bytes - 1;
cxlm->pmem_range.start = 0;
- 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));
+ cxlm->pmem_range.end = cxlm->active_persistent_bytes - 1;
return 0;
}
@@ -1427,6 +1509,10 @@ static int cxl_mem_probe(struct pci_dev *pdev, const struct pci_device_id *id)
if (rc)
return rc;
+ rc = cxl_mem_create_range_info(cxlm);
+ if (rc)
+ return rc;
+
cxlmd = devm_cxl_add_memdev(&pdev->dev, cxlm, &cxl_memdev_fops);
if (IS_ERR(cxlmd))
return PTR_ERR(cxlmd);