diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 2c8727253f0df..585079ae5f033 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -465,7 +465,7 @@ static u32 gen7_oa_hw_tail_read(struct i915_perf_stream *stream)
 static bool oa_buffer_check_unlocked(struct i915_perf_stream *stream)
 {
 	u32 gtt_offset = i915_ggtt_offset(stream->oa_buffer.vma);
-	int report_size = stream->oa_buffer.format_size;
+	int report_size = stream->oa_buffer.format->size;
 	unsigned long flags;
 	bool pollin;
 	u32 hw_tail;
@@ -602,7 +602,7 @@ static int append_oa_sample(struct i915_perf_stream *stream,
 			    size_t *offset,
 			    const u8 *report)
 {
-	int report_size = stream->oa_buffer.format_size;
+	int report_size = stream->oa_buffer.format->size;
 	struct drm_i915_perf_record_header header;
 
 	header.type = DRM_I915_PERF_RECORD_SAMPLE;
@@ -652,7 +652,7 @@ static int gen8_append_oa_reports(struct i915_perf_stream *stream,
 				  size_t *offset)
 {
 	struct intel_uncore *uncore = stream->uncore;
-	int report_size = stream->oa_buffer.format_size;
+	int report_size = stream->oa_buffer.format->size;
 	u8 *oa_buf_base = stream->oa_buffer.vaddr;
 	u32 gtt_offset = i915_ggtt_offset(stream->oa_buffer.vma);
 	u32 mask = (OA_BUFFER_SIZE - 1);
@@ -945,7 +945,7 @@ static int gen7_append_oa_reports(struct i915_perf_stream *stream,
 				  size_t *offset)
 {
 	struct intel_uncore *uncore = stream->uncore;
-	int report_size = stream->oa_buffer.format_size;
+	int report_size = stream->oa_buffer.format->size;
 	u8 *oa_buf_base = stream->oa_buffer.vaddr;
 	u32 gtt_offset = i915_ggtt_offset(stream->oa_buffer.vma);
 	u32 mask = (OA_BUFFER_SIZE - 1);
@@ -2506,7 +2506,7 @@ static int gen12_configure_oar_context(struct i915_perf_stream *stream,
 {
 	int err;
 	struct intel_context *ce = stream->pinned_ctx;
-	u32 format = stream->oa_buffer.format;
+	u32 format = stream->oa_buffer.format->format;
 	u32 offset = stream->perf->ctx_oactxctrl_offset;
 	struct flex regs_context[] = {
 		{
@@ -2877,7 +2877,7 @@ static void gen7_oa_enable(struct i915_perf_stream *stream)
 	u32 ctx_id = stream->specific_ctx_id;
 	bool periodic = stream->periodic;
 	u32 period_exponent = stream->period_exponent;
-	u32 report_format = stream->oa_buffer.format;
+	u32 report_format = stream->oa_buffer.format->format;
 
 	/*
 	 * Reset buf pointers so we don't forward reports from before now.
@@ -2903,7 +2903,7 @@ static void gen7_oa_enable(struct i915_perf_stream *stream)
 static void gen8_oa_enable(struct i915_perf_stream *stream)
 {
 	struct intel_uncore *uncore = stream->uncore;
-	u32 report_format = stream->oa_buffer.format;
+	u32 report_format = stream->oa_buffer.format->format;
 
 	/*
 	 * Reset buf pointers so we don't forward reports from before now.
@@ -2929,7 +2929,7 @@ static void gen8_oa_enable(struct i915_perf_stream *stream)
 static void gen12_oa_enable(struct i915_perf_stream *stream)
 {
 	struct intel_uncore *uncore = stream->uncore;
-	u32 report_format = stream->oa_buffer.format;
+	u32 report_format = stream->oa_buffer.format->format;
 
 	/*
 	 * If we don't want OA reports from the OA buffer, then we don't even
@@ -3110,7 +3110,6 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
 	struct drm_i915_private *i915 = stream->perf->i915;
 	struct i915_perf *perf = stream->perf;
 	struct intel_gt *gt;
-	int format_size;
 	int ret;
 
 	if (!props->engine) {
@@ -3166,20 +3165,15 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
 
 	stream->sample_size = sizeof(struct drm_i915_perf_record_header);
 
-	format_size = perf->oa_formats[props->oa_format].size;
+	stream->oa_buffer.format = &perf->oa_formats[props->oa_format];
+	if (drm_WARN_ON(&i915->drm, stream->oa_buffer.format->size == 0))
+		return -EINVAL;
 
 	stream->sample_flags = props->sample_flags;
-	stream->sample_size += format_size;
-
-	stream->oa_buffer.format_size = format_size;
-	if (drm_WARN_ON(&i915->drm, stream->oa_buffer.format_size == 0))
-		return -EINVAL;
+	stream->sample_size += stream->oa_buffer.format->size;
 
 	stream->hold_preemption = props->hold_preemption;
 
-	stream->oa_buffer.format =
-		perf->oa_formats[props->oa_format].format;
-
 	stream->periodic = props->oa_periodic;
 	if (stream->periodic)
 		stream->period_exponent = props->oa_period_exponent;
diff --git a/drivers/gpu/drm/i915/i915_perf_types.h b/drivers/gpu/drm/i915/i915_perf_types.h
index dc9bfd8086cf8..e0c96b44eda8e 100644
--- a/drivers/gpu/drm/i915/i915_perf_types.h
+++ b/drivers/gpu/drm/i915/i915_perf_types.h
@@ -250,11 +250,10 @@ struct i915_perf_stream {
 	 * @oa_buffer: State of the OA buffer.
 	 */
 	struct {
+		const struct i915_oa_format *format;
 		struct i915_vma *vma;
 		u8 *vaddr;
 		u32 last_ctx_id;
-		int format;
-		int format_size;
 		int size_exponent;
 
 		/**