[PATCH v4 20/24] drm/amdkfd: enable pc sampling start

[James Zhu]

Enable pc sampling start.

Signed-off-by: James Zhu <James.Zhu at amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_pc_sampling.c | 27 +++++++++++++++++---
 1 file changed, 24 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_pc_sampling.c b/drivers/gpu/drm/amd/amdkfd/kfd_pc_sampling.c
index df2f4bfd0cda..6f50ba1f8989 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_pc_sampling.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_pc_sampling.c
@@ -95,9 +95,30 @@ static int kfd_pc_sample_query_cap(struct kfd_process_device *pdd,
 	return 0;
 }
 
-static int kfd_pc_sample_start(struct kfd_process_device *pdd)
+static int kfd_pc_sample_start(struct kfd_process_device *pdd,
+					struct pc_sampling_entry *pcs_entry)
 {
-	return -EINVAL;
+	bool pc_sampling_start = false;
+
+	pcs_entry->enabled = true;
+	mutex_lock(&pdd->dev->pcs_data.mutex);
+
+	kfd_process_set_trap_pc_sampling_flag(&pdd->qpd,
+		pdd->dev->pcs_data.hosttrap_entry.base.pc_sample_info.method, true);
+
+	if (!pdd->dev->pcs_data.hosttrap_entry.base.active_count)
+		pc_sampling_start = true;
+	pdd->dev->pcs_data.hosttrap_entry.base.active_count++;
+	mutex_unlock(&pdd->dev->pcs_data.mutex);
+
+	while (pc_sampling_start) {
+		if (READ_ONCE(pdd->dev->pcs_data.hosttrap_entry.base.stop_enable))
+			usleep_range(1000, 2000);
+		else
+			break;
+	}
+
+	return 0;
 }
 
 static int kfd_pc_sample_stop(struct kfd_process_device *pdd,
@@ -269,7 +290,7 @@ int kfd_pc_sample(struct kfd_process_device *pdd,
 		if (pcs_entry->enabled)
 			return -EALREADY;
 		else
-			return kfd_pc_sample_start(pdd);
+			return kfd_pc_sample_start(pdd, pcs_entry);
 
 	case KFD_IOCTL_PCS_OP_STOP:
 		if (!pcs_entry->enabled)
-- 
2.25.1