In each /sys/class/drm/cardX/device/ device you will see the following
xgmi_device_id /* contains the device id within the hive */
xgmi_hive_info ->
../../../../0000:00:01.1/0000:02:00.0/0000:03:00.0/0000:04:00.0/xgmi_hive_info/
/* hive info folder */
inside xgmi_hive_info are back pointers to /sys/class/drm/cardX/device/
for each hive member -
lrwxrwxrwx 1 root root 0 Mar 5 12:27 node1 -> ../../0000:04:00.0/
lrwxrwxrwx 1 root root 0 Mar 5 12:27 node2 ->
../../../../../0000:00:1b.0/0000:05:00.0/0000:06:00.0/0000:07:00.0/
-r--r--r-- 1 root root 4096 Mar 5 12:27 xgmi_hive_id /* contains the
hive id */
Andrey
On 3/5/19 1:18 PM, StDenis, Tom wrote:
> Couple of comments inline.
>
> Since I don't have any XGMI gear it would probably help to see what the
> final directory layout/contents look like so I can update umr to
> automagically scan all of this.
>
> Tom
>
> On 2019-03-05 12:47 p.m., Andrey Grodzovsky wrote:
>> For each device a file xgmi_device_id is created.
>> On the first device a subdirectory named xgmi_hive_info is created,
>> It contains a file named hive_id and symlinks named node 1-4 linking
>> to each device in the hive.
>>
>> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx>
>> ---
>> drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c | 145 ++++++++++++++++++++++++++++++-
>> drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h | 6 +-
>> 2 files changed, 146 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
>> index 407dd16c..394be10 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
>> @@ -34,12 +34,132 @@ static DEFINE_MUTEX(xgmi_mutex);
>> static struct amdgpu_hive_info xgmi_hives[AMDGPU_MAX_XGMI_HIVE];
>> static unsigned hive_count = 0;
>>
>> -
>> void *amdgpu_xgmi_hive_try_lock(struct amdgpu_hive_info *hive)
>> {
>> return &hive->device_list;
>> }
>>
>> +static ssize_t amdgpu_xgmi_show_hive_id(struct device *dev,
>> + struct device_attribute *attr, char *buf)
>> +{
>> + struct amdgpu_hive_info *hive =
>> + container_of(attr, struct amdgpu_hive_info, dev_attr);
>> +
>> + return snprintf(buf, PAGE_SIZE, "%llu\n", hive->hive_id);
>> +}
>> +
>> +static int amdgpu_xgmi_sysfs_create(struct amdgpu_device *adev,
>> + struct amdgpu_hive_info *hive)
>> +{
>> + int ret = 0;
>> +
>> + if (WARN_ON(hive->kobj))
>> + return -1;
>> +
>> + hive->kobj = kobject_create_and_add("xgmi_hive_info", &adev->dev->kobj);
>> + if (!hive->kobj) {
>> + dev_err(adev->dev, "XGMI: Failed to allocate sysfs entry!\n");
>> + return -1;
>> + }
>> +
>> + hive->dev_attr = (struct device_attribute) {
>> + .attr = {
>> + .name = "xgmi_hive_id",
>> + .mode = S_IRUGO,
>> +
>> + },
>> + .show = amdgpu_xgmi_show_hive_id,
>> + };
>> +
>> + ret = sysfs_create_file(hive->kobj, &hive->dev_attr.attr);
>> + if (ret) {
>> + dev_err(adev->dev, "XGMI: Failed to create device file xgmi_hive_id\n");
>> + kobject_del(hive->kobj);
>> + kobject_put(hive->kobj);
>> + hive->kobj = NULL;
>> + }
>> +
>> + return ret;
>> +}
>> +
>> +static void amdgpu_xgmi_sysfs_destroy(struct amdgpu_device *adev,
>> + struct amdgpu_hive_info *hive)
>> +{
>> + sysfs_remove_file(hive->kobj, &hive->dev_attr.attr);
>> + kobject_del(hive->kobj);
>> + kobject_put(hive->kobj);
>> + hive->kobj = NULL;
>> +}
>> +
>> +static ssize_t amdgpu_xgmi_show_device_id(struct device *dev,
>> + struct device_attribute *attr,
>> + char *buf)
>> +{
>> + struct drm_device *ddev = dev_get_drvdata(dev);
>> + struct amdgpu_device *adev = ddev->dev_private;
>> +
>> + return snprintf(buf, PAGE_SIZE, "%llu\n", adev->gmc.xgmi.node_id);
>> +
>> +}
>> +
>> +
>> +static DEVICE_ATTR(xgmi_device_id, S_IRUGO, amdgpu_xgmi_show_device_id, NULL);
>> +
>> +
>> +static int amdgpu_xgmi_sysf_add_dev_info(struct amdgpu_device *adev,
>> + struct amdgpu_hive_info *hive)
> Probably meant "sysfs" here right?
>
>> +{
>> + int ret = 0;
>> + char node[10] = { 0 };
>> +
>> + /* Create xgmi device id file */
>> + ret = device_create_file(adev->dev, &dev_attr_xgmi_device_id);
>> + if (ret) {
>> + dev_err(adev->dev, "XGMI: Failed to create device file xgmi_device_id\n");
>> + return ret;
>> + }
>> +
>> + /* Create sysfs link to hive info folder on the first device */
>> + if (adev != hive->adev) {
>> + ret = sysfs_create_link(&adev->dev->kobj, hive->kobj,
>> + "xgmi_hive_info");
>> + if (ret) {
>> + dev_err(adev->dev, "XGMI: Failed to create link to hive info");
>> + goto remove_file;
>> + }
>> + }
>> +
>> + sprintf(node, "node%d", hive->number_devices);
>> + /* Create sysfs link form the hive folder to yorself */
> "yourself"
>
>> + ret = sysfs_create_link(hive->kobj, &adev->dev->kobj, node);
>> + if (ret) {
>> + dev_err(adev->dev, "XGMI: Failed to create link from hive info");
>> + goto remove_link;
>> + }
>> +
>> + goto success;
>> +
>> +
>> +remove_link:
>> + sysfs_remove_link(&adev->dev->kobj, adev->ddev->unique);
>> +
>> +remove_file:
>> + device_remove_file(adev->dev, &dev_attr_xgmi_device_id);
>> +
>> +success:
>> + return ret;
>> +}
>> +
>> +static void amdgpu_xgmi_sysf_rem_dev_info(struct amdgpu_device *adev,
>> + struct amdgpu_hive_info *hive)
> And here.
>
>> +{
>> + device_remove_file(adev->dev, &dev_attr_xgmi_device_id);
>> + sysfs_remove_link(&adev->dev->kobj, adev->ddev->unique);
>> + sysfs_remove_link(hive->kobj, adev->ddev->unique);
>> +}
>> +
>> +
>> +
>> struct amdgpu_hive_info *amdgpu_get_xgmi_hive(struct amdgpu_device *adev, int lock)
>> {
>> int i;
>> @@ -66,10 +186,18 @@ struct amdgpu_hive_info *amdgpu_get_xgmi_hive(struct amdgpu_device *adev, int lo
>>
>> /* initialize new hive if not exist */
>> tmp = &xgmi_hives[hive_count++];
>> +
>> + if (amdgpu_xgmi_sysfs_create(adev, tmp)) {
>> + mutex_unlock(&xgmi_mutex);
>> + return NULL;
>> + }
>> +
>> + tmp->adev = adev;
>> tmp->hive_id = adev->gmc.xgmi.hive_id;
>> INIT_LIST_HEAD(&tmp->device_list);
>> mutex_init(&tmp->hive_lock);
>> mutex_init(&tmp->reset_lock);
>> +
>> if (lock)
>> mutex_lock(&tmp->hive_lock);
>>
>> @@ -156,8 +284,17 @@ int amdgpu_xgmi_add_device(struct amdgpu_device *adev)
>> break;
>> }
>>
>> - dev_info(adev->dev, "XGMI: Add node %d, hive 0x%llx.\n",
>> - adev->gmc.xgmi.physical_node_id, adev->gmc.xgmi.hive_id);
>> + if (!ret)
>> + ret = amdgpu_xgmi_sysf_add_dev_info(adev, hive);
>> +
>> + if (!ret)
>> + dev_info(adev->dev, "XGMI: Add node %d, hive 0x%llx.\n",
>> + adev->gmc.xgmi.physical_node_id, adev->gmc.xgmi.hive_id);
>> + else
>> + dev_err(adev->dev, "XGMI: Failed to add node %d, hive 0x%llx ret: %d\n",
>> + adev->gmc.xgmi.physical_node_id, adev->gmc.xgmi.hive_id,
>> + ret);
>> +
>>
>> mutex_unlock(&hive->hive_lock);
>> exit:
>> @@ -176,9 +313,11 @@ void amdgpu_xgmi_remove_device(struct amdgpu_device *adev)
>> return;
>>
>> if (!(hive->number_devices--)) {
>> + amdgpu_xgmi_sysfs_destroy(adev, hive);
>> mutex_destroy(&hive->hive_lock);
>> mutex_destroy(&hive->reset_lock);
>> } else {
>> + amdgpu_xgmi_sysf_rem_dev_info(adev, hive);
>> mutex_unlock(&hive->hive_lock);
>> }
>> }
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h
>> index 14bc606..24a3b03 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h
>> @@ -29,8 +29,10 @@ struct amdgpu_hive_info {
>> struct list_head device_list;
>> struct psp_xgmi_topology_info topology_info;
>> int number_devices;
>> - struct mutex hive_lock,
>> - reset_lock;
>> + struct mutex hive_lock, reset_lock;
>> + struct kobject *kobj;
>> + struct device_attribute dev_attr;
>> + struct amdgpu_device *adev;
>> };
>>
>> struct amdgpu_hive_info *amdgpu_get_xgmi_hive(struct amdgpu_device *adev, int lock);
>>
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