drm/amdgpu: Add sysfs entries for xgmi hive v2.

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.

v2: Return error codes instead of '-1' and few misspellings.

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 142 insertions, 3 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
index 407dd16cc35c..fcc4b05c745c 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 -EINVAL;
+
+        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 -EINVAL;
+        }
+
+        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_sysfs_add_dev_info(struct amdgpu_device *adev,
+                                         struct amdgpu_hive_info *hive)
+{
+        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 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_sysfs_rem_dev_info(struct amdgpu_device *adev,
+                                          struct amdgpu_hive_info *hive)
+{
+        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_sysfs_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_sysfs_rem_dev_info(adev, hive);
                 mutex_unlock(&hive->hive_lock);
         }
 }