Export qtg_id sysfs attributes for the respective ram and pmem DPA range of
a CXL device. The QTG ID should show up as
/sys/bus/cxl/devices/memX/pmem/qtg_id for pmem or as
/sys/bus/cxl/devices/memX/ram/qtg_id for ram.
Signed-off-by: Dave Jiang <dave.jiang@xxxxxxxxx>
---
Documentation/ABI/testing/sysfs-bus-cxl | 15 +++++++++++++++
drivers/cxl/core/memdev.c | 26 ++++++++++++++++++++++++++
2 files changed, 41 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-bus-cxl b/Documentation/ABI/testing/sysfs-bus-cxl
index 0932c2f6fbf4..8133a13e118d 100644
--- a/Documentation/ABI/testing/sysfs-bus-cxl
+++ b/Documentation/ABI/testing/sysfs-bus-cxl
@@ -27,6 +27,14 @@ Description:
identically named field in the Identify Memory Device Output
Payload in the CXL-2.0 specification.
+What: /sys/bus/cxl/devices/memX/ram/qtg_id
+Date: January, 2023
+KernelVersion: v6.3
+Contact: linux-cxl@xxxxxxxxxxxxxxx
+Description:
+ (RO) Shows calculated QoS Throttling Group ID for the
+ "Volatile Only Capacity" DPA range.
+
What: /sys/bus/cxl/devices/memX/pmem/size
Date: December, 2020
@@ -37,6 +45,13 @@ Description:
identically named field in the Identify Memory Device Output
Payload in the CXL-2.0 specification.
+What: /sys/bus/cxl/devices/memX/pmem/qtg_id
+Date: January, 2023
+KernelVersion: v6.3
+Contact: linux-cxl@xxxxxxxxxxxxxxx
+Description:
+ (RO) Shows calculated QoS Throttling Group ID for the
+ "Persistent Only Capacity" DPA range.
What: /sys/bus/cxl/devices/memX/serial
Date: January, 2022
diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c
index a74a93310d26..06f9ac929ef4 100644
--- a/drivers/cxl/core/memdev.c
+++ b/drivers/cxl/core/memdev.c
@@ -76,6 +76,18 @@ static ssize_t ram_size_show(struct device *dev, struct device_attribute *attr,
static struct device_attribute dev_attr_ram_size =
__ATTR(size, 0444, ram_size_show, NULL);
+static ssize_t ram_qtg_id_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, "%d\n", cxlds->ram_qtg_id);
+}
+
+static struct device_attribute dev_attr_ram_qtg_id =
+ __ATTR(qtg_id, 0444, ram_qtg_id_show, NULL);
+
static ssize_t pmem_size_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
@@ -89,6 +101,18 @@ 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 pmem_qtg_id_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, "%d\n", cxlds->pmem_qtg_id);
+}
+
+static struct device_attribute dev_attr_pmem_qtg_id =
+ __ATTR(qtg_id, 0444, pmem_qtg_id_show, NULL);
+
static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
@@ -117,11 +141,13 @@ static struct attribute *cxl_memdev_attributes[] = {
static struct attribute *cxl_memdev_pmem_attributes[] = {
&dev_attr_pmem_size.attr,
+ &dev_attr_pmem_qtg_id.attr,
NULL,
};
static struct attribute *cxl_memdev_ram_attributes[] = {
&dev_attr_ram_size.attr,
+ &dev_attr_ram_qtg_id.attr,
NULL,
};
