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Date: Wed, 4 Nov 2020 16:09:06 +0200
From: Oded Gabbay <ogabbay@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: SW_Drivers@...ana.ai, Tomer Tayar <ttayar@...ana.ai>
Subject: [PATCH] habanalabs: Separate CS job completion from its deallocation
From: Tomer Tayar <ttayar@...ana.ai>
Current CS jobs are no longer needed after their completion.
However, jobs of future workload might be in use even after they are
completed. To allow that, the patch adds a refcount to the job object,
and decouples its completion handling from its deallocation.
Signed-off-by: Tomer Tayar <ttayar@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
.../habanalabs/common/command_submission.c | 25 ++++++++++++++-----
drivers/misc/habanalabs/common/debugfs.c | 13 +++++-----
drivers/misc/habanalabs/common/habanalabs.h | 2 ++
3 files changed, 28 insertions(+), 12 deletions(-)
diff --git a/drivers/misc/habanalabs/common/command_submission.c b/drivers/misc/habanalabs/common/command_submission.c
index 6de4b161856c..662b19663839 100644
--- a/drivers/misc/habanalabs/common/command_submission.c
+++ b/drivers/misc/habanalabs/common/command_submission.c
@@ -155,6 +155,18 @@ static void cs_put(struct hl_cs *cs)
kref_put(&cs->refcount, cs_do_release);
}
+static void cs_job_do_release(struct kref *ref)
+{
+ struct hl_cs_job *job = container_of(ref, struct hl_cs_job, refcount);
+
+ kfree(job);
+}
+
+static void cs_job_put(struct hl_cs_job *job)
+{
+ kref_put(&job->refcount, cs_job_do_release);
+}
+
static bool is_cb_patched(struct hl_device *hdev, struct hl_cs_job *job)
{
/*
@@ -227,7 +239,7 @@ static int cs_parser(struct hl_fpriv *hpriv, struct hl_cs_job *job)
return rc;
}
-static void free_job(struct hl_device *hdev, struct hl_cs_job *job)
+static void complete_job(struct hl_device *hdev, struct hl_cs_job *job)
{
struct hl_cs *cs = job->cs;
@@ -276,7 +288,7 @@ static void free_job(struct hl_device *hdev, struct hl_cs_job *job)
job->queue_type == QUEUE_TYPE_HW)
cs_put(cs);
- kfree(job);
+ cs_job_put(job);
}
static void cs_do_release(struct kref *ref)
@@ -290,13 +302,13 @@ static void cs_do_release(struct kref *ref)
/*
* Although if we reached here it means that all external jobs have
* finished, because each one of them took refcnt to CS, we still
- * need to go over the internal jobs and free them. Otherwise, we
+ * need to go over the internal jobs and complete them. Otherwise, we
* will have leaked memory and what's worse, the CS object (and
* potentially the CTX object) could be released, while the JOB
* still holds a pointer to them (but no reference).
*/
list_for_each_entry_safe(job, tmp, &cs->job_list, cs_node)
- free_job(hdev, job);
+ complete_job(hdev, job);
if (!cs->submitted) {
/* In case the wait for signal CS was submitted, the put occurs
@@ -507,7 +519,7 @@ static void cs_rollback(struct hl_device *hdev, struct hl_cs *cs)
struct hl_cs_job *job, *tmp;
list_for_each_entry_safe(job, tmp, &cs->job_list, cs_node)
- free_job(hdev, job);
+ complete_job(hdev, job);
}
void hl_cs_rollback_all(struct hl_device *hdev)
@@ -539,7 +551,7 @@ static void job_wq_completion(struct work_struct *work)
struct hl_device *hdev = cs->ctx->hdev;
/* job is no longer needed */
- free_job(hdev, job);
+ complete_job(hdev, job);
}
static int validate_queue_index(struct hl_device *hdev,
@@ -647,6 +659,7 @@ struct hl_cs_job *hl_cs_allocate_job(struct hl_device *hdev,
if (!job)
return NULL;
+ kref_init(&job->refcount);
job->queue_type = queue_type;
job->is_kernel_allocated_cb = is_kernel_allocated_cb;
diff --git a/drivers/misc/habanalabs/common/debugfs.c b/drivers/misc/habanalabs/common/debugfs.c
index 912ddfa360b1..b44193ec3d12 100644
--- a/drivers/misc/habanalabs/common/debugfs.c
+++ b/drivers/misc/habanalabs/common/debugfs.c
@@ -168,18 +168,19 @@ static int command_submission_jobs_show(struct seq_file *s, void *data)
if (first) {
first = false;
seq_puts(s, "\n");
- seq_puts(s, " JOB ID CS ID CTX ASID H/W Queue\n");
- seq_puts(s, "---------------------------------------\n");
+ seq_puts(s, " JOB ID CS ID CTX ASID JOB RefCnt H/W Queue\n");
+ seq_puts(s, "----------------------------------------------------\n");
}
if (job->cs)
seq_printf(s,
- " %02d %llu %d %d\n",
+ " %02d %llu %d %d %d\n",
job->id, job->cs->sequence, job->cs->ctx->asid,
- job->hw_queue_id);
+ kref_read(&job->refcount), job->hw_queue_id);
else
seq_printf(s,
- " %02d 0 %d %d\n",
- job->id, HL_KERNEL_ASID_ID, job->hw_queue_id);
+ " %02d 0 %d %d %d\n",
+ job->id, HL_KERNEL_ASID_ID,
+ kref_read(&job->refcount), job->hw_queue_id);
}
spin_unlock(&dev_entry->cs_job_spinlock);
diff --git a/drivers/misc/habanalabs/common/habanalabs.h b/drivers/misc/habanalabs/common/habanalabs.h
index 227f1a9552a6..2e3021adc824 100644
--- a/drivers/misc/habanalabs/common/habanalabs.h
+++ b/drivers/misc/habanalabs/common/habanalabs.h
@@ -1142,6 +1142,7 @@ struct hl_cs {
* @userptr_list: linked-list of userptr mappings that belong to this job and
* wait for completion.
* @debugfs_list: node in debugfs list of command submission jobs.
+ * @refcount: reference counter for usage of the CS job.
* @queue_type: the type of the H/W queue this job is submitted to.
* @id: the id of this job inside a CS.
* @hw_queue_id: the id of the H/W queue this job is submitted to.
@@ -1165,6 +1166,7 @@ struct hl_cs_job {
struct work_struct finish_work;
struct list_head userptr_list;
struct list_head debugfs_list;
+ struct kref refcount;
enum hl_queue_type queue_type;
u32 id;
u32 hw_queue_id;
--
2.17.1
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