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Date: Thu, 19 Jan 2023 12:33:35 +0200
From: Oded Gabbay <ogabbay@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Ofir Bitton <obitton@...ana.ai>
Subject: [PATCH 06/10] habanalabs: optimize command submission completion timestamp
From: Ofir Bitton <obitton@...ana.ai>
Completion timestamp is taken during the actual command submission
release. As the release happens in a work queue, the timestamp taken
is not accurate. Hence, we will take the timestamp in the interrupt
handler itself while propagating it to the release function.
Signed-off-by: Ofir Bitton <obitton@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
.../accel/habanalabs/common/command_submission.c | 12 ++++++++++--
drivers/accel/habanalabs/common/habanalabs.h | 4 ++++
drivers/accel/habanalabs/common/irq.c | 13 +++++++++----
3 files changed, 23 insertions(+), 6 deletions(-)
diff --git a/drivers/accel/habanalabs/common/command_submission.c b/drivers/accel/habanalabs/common/command_submission.c
index 00fedf2d8654..8270db0a72a2 100644
--- a/drivers/accel/habanalabs/common/command_submission.c
+++ b/drivers/accel/habanalabs/common/command_submission.c
@@ -398,8 +398,16 @@ static void hl_complete_job(struct hl_device *hdev, struct hl_cs_job *job)
* flow by calling 'hl_hw_queue_update_ci'.
*/
if (cs_needs_completion(cs) &&
- (job->queue_type == QUEUE_TYPE_EXT || job->queue_type == QUEUE_TYPE_HW))
+ (job->queue_type == QUEUE_TYPE_EXT || job->queue_type == QUEUE_TYPE_HW)) {
+
+ /* In CS based completions, the timestamp is already available,
+ * so no need to extract it from job
+ */
+ if (hdev->asic_prop.completion_mode == HL_COMPLETION_MODE_JOB)
+ cs->completion_timestamp = job->timestamp;
+
cs_put(cs);
+ }
hl_cs_job_put(job);
}
@@ -776,7 +784,7 @@ static void cs_do_release(struct kref *ref)
}
if (cs->timestamp) {
- cs->fence->timestamp = ktime_get();
+ cs->fence->timestamp = cs->completion_timestamp;
hl_push_cs_outcome(hdev, &cs->ctx->outcome_store, cs->sequence,
cs->fence->timestamp, cs->fence->error);
}
diff --git a/drivers/accel/habanalabs/common/habanalabs.h b/drivers/accel/habanalabs/common/habanalabs.h
index a0dfbf4f6cbb..afc0c0d3f9e3 100644
--- a/drivers/accel/habanalabs/common/habanalabs.h
+++ b/drivers/accel/habanalabs/common/habanalabs.h
@@ -1940,6 +1940,7 @@ struct hl_userptr {
* @type: CS_TYPE_*.
* @jobs_cnt: counter of submitted jobs on all queues.
* @encaps_sig_hdl_id: encaps signals handle id, set for the first staged cs.
+ * @completion_timestamp: timestamp of the last completed cs job.
* @sob_addr_offset: sob offset from the configuration base address.
* @initial_sob_count: count of completed signals in SOB before current submission of signal or
* cs with encaps signals.
@@ -1972,6 +1973,7 @@ struct hl_cs {
struct list_head staged_cs_node;
struct list_head debugfs_list;
struct hl_cs_encaps_sig_handle *encaps_sig_hdl;
+ ktime_t completion_timestamp;
u64 sequence;
u64 staged_sequence;
u64 timeout_jiffies;
@@ -2007,6 +2009,7 @@ struct hl_cs {
* @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.
+ * @timestamp: timestamp upon job completion
* @id: the id of this job inside a CS.
* @hw_queue_id: the id of the H/W queue this job is submitted to.
* @user_cb_size: the actual size of the CB we got from the user.
@@ -2033,6 +2036,7 @@ struct hl_cs_job {
struct list_head debugfs_list;
struct kref refcount;
enum hl_queue_type queue_type;
+ ktime_t timestamp;
u32 id;
u32 hw_queue_id;
u32 user_cb_size;
diff --git a/drivers/accel/habanalabs/common/irq.c b/drivers/accel/habanalabs/common/irq.c
index a986d7dea453..04844e843a7b 100644
--- a/drivers/accel/habanalabs/common/irq.c
+++ b/drivers/accel/habanalabs/common/irq.c
@@ -72,15 +72,17 @@ static void irq_handle_eqe(struct work_struct *work)
* @hdev: pointer to device structure
* @cs_seq: command submission sequence
* @cq: completion queue
+ * @timestamp: interrupt timestamp
*
*/
-static void job_finish(struct hl_device *hdev, u32 cs_seq, struct hl_cq *cq)
+static void job_finish(struct hl_device *hdev, u32 cs_seq, struct hl_cq *cq, ktime_t timestamp)
{
struct hl_hw_queue *queue;
struct hl_cs_job *job;
queue = &hdev->kernel_queues[cq->hw_queue_id];
job = queue->shadow_queue[hl_pi_2_offset(cs_seq)];
+ job->timestamp = timestamp;
queue_work(hdev->cq_wq[cq->cq_idx], &job->finish_work);
atomic_inc(&queue->ci);
@@ -91,9 +93,10 @@ static void job_finish(struct hl_device *hdev, u32 cs_seq, struct hl_cq *cq)
*
* @hdev: pointer to device structure
* @cs_seq: command submission sequence
+ * @timestamp: interrupt timestamp
*
*/
-static void cs_finish(struct hl_device *hdev, u16 cs_seq)
+static void cs_finish(struct hl_device *hdev, u16 cs_seq, ktime_t timestamp)
{
struct asic_fixed_properties *prop = &hdev->asic_prop;
struct hl_hw_queue *queue;
@@ -113,6 +116,7 @@ static void cs_finish(struct hl_device *hdev, u16 cs_seq)
atomic_inc(&queue->ci);
}
+ cs->completion_timestamp = timestamp;
queue_work(hdev->cs_cmplt_wq, &cs->finish_work);
}
@@ -130,6 +134,7 @@ irqreturn_t hl_irq_handler_cq(int irq, void *arg)
bool shadow_index_valid, entry_ready;
u16 shadow_index;
struct hl_cq_entry *cq_entry, *cq_base;
+ ktime_t timestamp = ktime_get();
if (hdev->disabled) {
dev_dbg(hdev->dev,
@@ -171,9 +176,9 @@ irqreturn_t hl_irq_handler_cq(int irq, void *arg)
if (shadow_index_valid && !hdev->disabled) {
if (hdev->asic_prop.completion_mode ==
HL_COMPLETION_MODE_CS)
- cs_finish(hdev, shadow_index);
+ cs_finish(hdev, shadow_index, timestamp);
else
- job_finish(hdev, shadow_index, cq);
+ job_finish(hdev, shadow_index, cq, timestamp);
}
/* Clear CQ entry ready bit */
--
2.25.1
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