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Code Issues Releases Wiki Activity

cxl/memdev: Add numa_node attribute

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While CXL memory targets will have their own memory target node,
individual memory devices may be affinitized like other PCI devices.
Emit that attribute for memdevs.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/164298428430.3018233.16409089892707993289.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2022-01-23 16:31:24 -08:00
parent bcc79ea343
commit cf1f6877b0
3 changed files with 27 additions and 0 deletions
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9
Documentation/ABI/testing/sysfs-bus-cxl
View file

@ -34,6 +34,15 @@ Description:
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/memX/numa_node
Date: January, 2022
KernelVersion: v5.18
Contact: linux-cxl@vger.kernel.org
Description:
(RO) If NUMA is enabled and the platform has affinitized the
host PCI device for this memory device, emit the CPU node
affinity for this device.
What: /sys/bus/cxl/devices/*/devtype
Date: June, 2021
KernelVersion: v5.14

17
drivers/cxl/core/memdev.c
View file

@ -99,11 +99,19 @@ static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR_RO(serial);
static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%d\n", dev_to_node(dev));
}
static DEVICE_ATTR_RO(numa_node);
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,
&dev_attr_numa_node.attr,
NULL,
};
@ -117,8 +125,17 @@ static struct attribute *cxl_memdev_ram_attributes[] = {
NULL,
};
static umode_t cxl_memdev_visible(struct kobject *kobj, struct attribute *a,
int n)
{
if (!IS_ENABLED(CONFIG_NUMA) && a == &dev_attr_numa_node.attr)
return 0;
return a->mode;
}
static struct attribute_group cxl_memdev_attribute_group = {
.attrs = cxl_memdev_attributes,
.is_visible = cxl_memdev_visible,
};
static struct attribute_group cxl_memdev_ram_attribute_group = {

1
tools/testing/cxl/test/cxl.c
View file

@ -583,6 +583,7 @@ static __init int cxl_test_init(void)
if (!pdev)
goto err_mem;
pdev->dev.parent = &port->dev;
set_dev_node(&pdev->dev, i % 2);
rc = platform_device_add(pdev);
if (rc) {