drm/xe/oa: Add syncs support to OA config ioctl

In addition to stream open, add xe_sync support to the OA config ioctl,
where it is even more useful. This allows e.g. Mesa to replay a workload
repeatedly on the GPU, each time with a different OA configuration, while
precisely controlling (at batch buffer granularity) the workload segment
for which a particular OA configuration is active, without introducing
stalls in the userspace pipeline.

v2: Emit OA config even when config id is same as previous, to ensure
consistent sync behavior (Jose)

Reviewed-by: Jonathan Cavitt <[e-mail]>
Signed-off-by: Ashutosh Dixit <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/xe/xe_oa.c

···
 		xe_gt_WARN_ON(gt, xe_guc_pc_unset_gucrc_mode(&gt->uc.guc.pc));
 
 	xe_oa_free_configs(stream);
+	xe_file_put(stream->xef);
 }
 
 static int xe_oa_alloc_oa_buffer(struct xe_oa_stream *stream)
···
 
 static long xe_oa_config_locked(struct xe_oa_stream *stream, u64 arg)
 {
-	struct drm_xe_ext_set_property ext;
+	struct xe_oa_open_param param = {};
 	long ret = stream->oa_config->id;
 	struct xe_oa_config *config;
 	int err;
 
-	err = __copy_from_user(&ext, u64_to_user_ptr(arg), sizeof(ext));
-	if (XE_IOCTL_DBG(stream->oa->xe, err))
-		return -EFAULT;
+	err = xe_oa_user_extensions(stream->oa, arg, 0, &param);
+	if (err)
+		return err;
 
-	if (XE_IOCTL_DBG(stream->oa->xe, ext.pad) ||
-	    XE_IOCTL_DBG(stream->oa->xe, ext.base.name != DRM_XE_OA_EXTENSION_SET_PROPERTY) ||
-	    XE_IOCTL_DBG(stream->oa->xe, ext.base.next_extension) ||
-	    XE_IOCTL_DBG(stream->oa->xe, ext.property != DRM_XE_OA_PROPERTY_OA_METRIC_SET))
-		return -EINVAL;
-
-	config = xe_oa_get_oa_config(stream->oa, ext.value);
+	config = xe_oa_get_oa_config(stream->oa, param.metric_set);
 	if (!config)
 		return -ENODEV;
 
-	if (config != stream->oa_config) {
-		err = xe_oa_emit_oa_config(stream, config);
-		if (!err)
-			config = xchg(&stream->oa_config, config);
-		else
-			ret = err;
+	param.xef = stream->xef;
+	err = xe_oa_parse_syncs(stream->oa, &param);
+	if (err)
+		goto err_config_put;
+
+	stream->num_syncs = param.num_syncs;
+	stream->syncs = param.syncs;
+
+	err = xe_oa_emit_oa_config(stream, config);
+	if (!err) {
+		config = xchg(&stream->oa_config, config);
+		drm_dbg(&stream->oa->xe->drm, "changed to oa config uuid=%s\n",
+			stream->oa_config->uuid);
 	}
 
+err_config_put:
 	xe_oa_config_put(config);
 
-	return ret;
+	return err ?: ret;
 }
 
 static long xe_oa_status_locked(struct xe_oa_stream *stream, unsigned long arg)
···
 	stream->period_exponent = param->period_exponent;
 	stream->no_preempt = param->no_preempt;
 
+	stream->xef = xe_file_get(param->xef);
 	stream->num_syncs = param->num_syncs;
 	stream->syncs = param->syncs;
 
···
 err_free_configs:
 	xe_oa_free_configs(stream);
 exit:
+	xe_file_put(stream->xef);
 	return ret;
 }
 

drivers/gpu/drm/xe/xe_oa_types.h

···
 	/** @no_preempt: Whether preemption and timeslicing is disabled for stream exec_q */
 	u32 no_preempt;
 
+	/** @xef: xe_file with which the stream was opened */
+	struct xe_file *xef;
+
 	/** @last_fence: fence to use in stream destroy when needed */
 	struct dma_fence *last_fence;