2. I also looked into kobj_attribute see if I can simply use sysfs_create_group (instead of sysfs_create_file three times) like how KFD implements DF and topology perf. The challenge is it needs a pre-declared attrs set but in my case, queues are created dynamically so I can't pre-declare them unless I can predict the number of queues. Attr sets for DF and perf are both a fixed number. They both declare the attr sets in global data before the function calls sysfs_create_group while I can't do that in this case due to queues are dynamically generated.
Thanks for the two inline comments. I'll fix them and submit again.
Regards,
Amber
-----Original Message-----
From: Kuehling, Felix <Felix.Kuehling@xxxxxxx>
Sent: Friday, January 31, 2020 12:06 PM
To: Lin, Amber <Amber.Lin@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Subject: Re: [PATCH v2] drm/amdkfd: Add queue information to sysfs
You could save yourself the trouble of manually adding and removed individual sysfs files by setting the default_attrs in the kobj_type.
See ttm_memory.c for an example how this is done.
More comments inline.
On 2020-01-31 8:45 a.m., Amber Lin wrote:
Provide compute queues information in sysfs under /sys/class/kfd/kfd/proc.
The format is /sys/class/kfd/kfd/proc/<pid>/queues/<queue id>/XX where
XX are size, type, and gpuid three files to represent queue size,
queue type, and the GPU this queue uses. <queue id> folder and files
underneath are generated when a queue is created. They are removed
when the queue is destroyed.
Signed-off-by: Amber Lin <Amber.Lin@xxxxxxx>
---
drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 9 ++
drivers/gpu/drm/amd/amdkfd/kfd_process.c | 96 ++++++++++++++++++++++
.../gpu/drm/amd/amdkfd/kfd_process_queue_manager.c | 2 +
3 files changed, 107 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
index c0b0def..cb2d2d7 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
@@ -503,6 +503,12 @@ struct queue {
struct kfd_process *process;
struct kfd_dev *device;
void *gws;
+
+ /* procfs */
+ struct kobject *kobj_qid;
+ struct attribute attr_size;
+ struct attribute attr_type;
+ struct attribute attr_gpuid;
};
/*
@@ -730,6 +736,7 @@ struct kfd_process {
/* Kobj for our procfs */
struct kobject *kobj;
+ struct kobject *kobj_queues;
struct attribute attr_pasid;
};
@@ -836,6 +843,8 @@ extern struct device *kfd_device;
/* KFD's procfs */
void kfd_procfs_init(void);
void kfd_procfs_shutdown(void);
+int kfd_procfs_add_queue(struct queue *q); void
+kfd_procfs_del_queue(struct queue *q);
/* Topology */
int kfd_topology_init(void);
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
index 25b90f7..78ca037 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -132,6 +132,94 @@ void kfd_procfs_shutdown(void)
}
}
+static int kfd_procfs_add_file(const char *name, struct kobject *kobj,
+ struct attribute *attr)
+{
+ int ret;
+
+ attr->name = name;
+ attr->mode = KFD_SYSFS_FILE_MODE;
+ sysfs_attr_init(attr);
+ ret = sysfs_create_file(kobj, attr);
+ if (ret)
+ pr_warn("Creating %s file failed", name);
+ return ret;
+}
+
+static ssize_t kfd_procfs_queue_show(struct kobject *kobj,
+ struct attribute *attr, char *buffer) {
+ if (!strcmp(attr->name, "size")) {
+ struct queue *q = container_of(attr, struct queue, attr_size);
+ return snprintf(buffer, PAGE_SIZE, "%llu",
+ q->properties.queue_size);
+ } else if (!strcmp(attr->name, "type")) {
+ struct queue *q = container_of(attr, struct queue, attr_type);
+ return snprintf(buffer, PAGE_SIZE, "%d", q->properties.type);
+ } else if (!strcmp(attr->name, "gpuid")) {
+ struct queue *q = container_of(attr, struct queue, attr_gpuid);
+ return snprintf(buffer, PAGE_SIZE, "%u", q->device->id);
+ } else
+ pr_err("Invalid attribute");
+
+ return 0;
+}
+
+static const struct sysfs_ops procfs_queue_ops = {
+ .show = kfd_procfs_queue_show,
+};
+
+static struct kobj_type procfs_queue_type = {
+ .release = kfd_procfs_kobj_release,
+ .sysfs_ops = &procfs_queue_ops,
+};
+
+int kfd_procfs_add_queue(struct queue *q) {
+ struct kfd_process *proc;
+ int ret;
+
+ if (!q || !q->process)
+ return -EINVAL;
+ proc = q->process;
+
+ /* Create proc/<pid>/queues/<queue id> folder*/
+ if (!proc->kobj_queues)
+ return -EFAULT;
+ if (q->kobj_qid)
+ return -EEXIST;
+ q->kobj_qid = kfd_alloc_struct(q->kobj_qid);
+ if (!q->kobj_qid)
+ return -ENOMEM;
+ ret = kobject_init_and_add(q->kobj_qid, &procfs_queue_type,
+ proc->kobj_queues, "%u", q->properties.queue_id);
+ if (ret < 0) {
+ pr_warn("Creating proc/<pid>/queues/%u failed",
+ q->properties.queue_id);
After kobject_init_and_add fails, you must call kobject_put to avoid memory leaks.
+ return ret;
+ }
+
+ /* Create proc/<pid>/queues/<queue id>/XX files */
+ kfd_procfs_add_file("size", q->kobj_qid, &q->attr_size);
+ kfd_procfs_add_file("type", q->kobj_qid, &q->attr_type);
+ kfd_procfs_add_file("gpuid", q->kobj_qid, &q->attr_gpuid);
+
+ return 0;
+}
+
+void kfd_procfs_del_queue(struct queue *q)
+{
+ if (!q || !q->process)
+ return;
You need to check q->obj_qid too, in case kfd_procfs_add_queue failed.
Regards,
Felix
+
+ sysfs_remove_file(q->kobj_qid, &q->attr_size);
+ sysfs_remove_file(q->kobj_qid, &q->attr_type);
+ sysfs_remove_file(q->kobj_qid, &q->attr_gpuid);
+ kobject_del(q->kobj_qid);
+ kobject_put(q->kobj_qid);
+ q->kobj_qid = NULL;
+}
+
int kfd_process_create_wq(void)
{
if (!kfd_process_wq)
@@ -323,6 +411,11 @@ struct kfd_process *kfd_create_process(struct file *filep)
if (ret)
pr_warn("Creating pasid for pid %d failed",
(int)process->lead_thread->pid);
+
+ process->kobj_queues = kobject_create_and_add("queues",
+ process->kobj);
+ if (!process->kobj_queues)
+ pr_warn("Creating KFD proc/queues folder failed");
}
out:
if (!IS_ERR(process))
@@ -457,6 +550,9 @@ static void kfd_process_wq_release(struct work_struct *work)
/* Remove the procfs files */
if (p->kobj) {
sysfs_remove_file(p->kobj, &p->attr_pasid);
+ kobject_del(p->kobj_queues);
+ kobject_put(p->kobj_queues);
+ p->kobj_queues = NULL;
kobject_del(p->kobj);
kobject_put(p->kobj);
p->kobj = NULL;
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
index 8fa856e..cb1ca11 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
@@ -322,6 +322,7 @@ int pqm_create_queue(struct process_queue_manager *pqm,
if (q) {
pr_debug("PQM done creating queue\n");
+ kfd_procfs_add_queue(q);
print_queue_properties(&q->properties);
}
@@ -378,6 +379,7 @@ int pqm_destroy_queue(struct process_queue_manager *pqm, unsigned int qid)
}
if (pqn->q) {
+ kfd_procfs_del_queue(pqn->q);
dqm = pqn->q->device->dqm;
retval = dqm->ops.destroy_queue(dqm, &pdd->qpd, pqn->q);
if (retval) {
