diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 65eaac2d7e3c..a0069add9d39 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2053,6 +2053,8 @@ struct drm_i915_private {
 				u32 last_ctx_id;
 				int format;
 				int format_size;
+				u32 size;
+				int size_exponent;
 
 				/**
 				 * Locks reads and writes to all head/tail state
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index a648ded97969..1eaef711160a 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -212,13 +212,7 @@
 #include "i915_oa_icl.h"
 #include "intel_lrc_reg.h"
 
-/* HW requires this to be a power of two, between 128k and 16M, though driver
- * is currently generally designed assuming the largest 16M size is used such
- * that the overflow cases are unlikely in normal operation.
- */
-#define OA_BUFFER_SIZE		SZ_16M
-
-#define OA_TAKEN(tail, head)	((tail - head) & (OA_BUFFER_SIZE - 1))
+#define OA_TAKEN(tail, head)	((tail - head) & (dev_priv->perf.oa.oa_buffer.size - 1))
 
 /**
  * DOC: OA Tail Pointer Race
@@ -361,6 +355,8 @@ struct perf_open_properties {
 	int oa_format;
 	bool oa_periodic;
 	int oa_period_exponent;
+	u32 oa_buffer_size;
+	u32 oa_buffer_size_exponent;
 };
 
 static void free_oa_config(struct drm_i915_private *dev_priv,
@@ -523,7 +519,7 @@ static bool oa_buffer_check_unlocked(struct drm_i915_private *dev_priv)
 		 * could put the tail out of bounds...
 		 */
 		if (hw_tail >= gtt_offset &&
-		    hw_tail < (gtt_offset + OA_BUFFER_SIZE)) {
+		    hw_tail < (gtt_offset + dev_priv->perf.oa.oa_buffer.size)) {
 			dev_priv->perf.oa.oa_buffer.tails[!aged_idx].offset =
 				aging_tail = hw_tail;
 			dev_priv->perf.oa.oa_buffer.aging_timestamp = now;
@@ -652,7 +648,7 @@ static int gen8_append_oa_reports(struct i915_perf_stream *stream,
 	int report_size = dev_priv->perf.oa.oa_buffer.format_size;
 	u8 *oa_buf_base = dev_priv->perf.oa.oa_buffer.vaddr;
 	u32 gtt_offset = i915_ggtt_offset(dev_priv->perf.oa.oa_buffer.vma);
-	u32 mask = (OA_BUFFER_SIZE - 1);
+	u32 mask = (dev_priv->perf.oa.oa_buffer.size - 1);
 	size_t start_offset = *offset;
 	unsigned long flags;
 	unsigned int aged_tail_idx;
@@ -692,8 +688,8 @@ static int gen8_append_oa_reports(struct i915_perf_stream *stream,
 	 * only be incremented by multiples of the report size (notably also
 	 * all a power of two).
 	 */
-	if (WARN_ONCE(head > OA_BUFFER_SIZE || head % report_size ||
-		      tail > OA_BUFFER_SIZE || tail % report_size,
+	if (WARN_ONCE(head > dev_priv->perf.oa.oa_buffer.size || head % report_size ||
+		      tail > dev_priv->perf.oa.oa_buffer.size || tail % report_size,
 		      "Inconsistent OA buffer pointers: head = %u, tail = %u\n",
 		      head, tail))
 		return -EIO;
@@ -716,7 +712,7 @@ static int gen8_append_oa_reports(struct i915_perf_stream *stream,
 		 * here would imply a driver bug that would result
 		 * in an overrun.
 		 */
-		if (WARN_ON((OA_BUFFER_SIZE - head) < report_size)) {
+		if (WARN_ON((dev_priv->perf.oa.oa_buffer.size - head) < report_size)) {
 			DRM_ERROR("Spurious OA head ptr: non-integral report offset\n");
 			break;
 		}
@@ -941,7 +937,7 @@ static int gen7_append_oa_reports(struct i915_perf_stream *stream,
 	int report_size = dev_priv->perf.oa.oa_buffer.format_size;
 	u8 *oa_buf_base = dev_priv->perf.oa.oa_buffer.vaddr;
 	u32 gtt_offset = i915_ggtt_offset(dev_priv->perf.oa.oa_buffer.vma);
-	u32 mask = (OA_BUFFER_SIZE - 1);
+	u32 mask = (dev_priv->perf.oa.oa_buffer.size - 1);
 	size_t start_offset = *offset;
 	unsigned long flags;
 	unsigned int aged_tail_idx;
@@ -978,8 +974,8 @@ static int gen7_append_oa_reports(struct i915_perf_stream *stream,
 	 * only be incremented by multiples of the report size (notably also
 	 * all a power of two).
 	 */
-	if (WARN_ONCE(head > OA_BUFFER_SIZE || head % report_size ||
-		      tail > OA_BUFFER_SIZE || tail % report_size,
+	if (WARN_ONCE(head > dev_priv->perf.oa.oa_buffer.size || head % report_size ||
+		      tail > dev_priv->perf.oa.oa_buffer.size || tail % report_size,
 		      "Inconsistent OA buffer pointers: head = %u, tail = %u\n",
 		      head, tail))
 		return -EIO;
@@ -999,7 +995,7 @@ static int gen7_append_oa_reports(struct i915_perf_stream *stream,
 		 * here would imply a driver bug that would result
 		 * in an overrun.
 		 */
-		if (WARN_ON((OA_BUFFER_SIZE - head) < report_size)) {
+		if (WARN_ON((dev_priv->perf.oa.oa_buffer.size - head) < report_size)) {
 			DRM_ERROR("Spurious OA head ptr: non-integral report offset\n");
 			break;
 		}
@@ -1396,7 +1392,9 @@ static void gen7_init_oa_buffer(struct drm_i915_private *dev_priv)
 
 	I915_WRITE(GEN7_OABUFFER, gtt_offset);
 
-	I915_WRITE(GEN7_OASTATUS1, gtt_offset | OABUFFER_SIZE_16M); /* tail */
+	I915_WRITE(GEN7_OASTATUS1, gtt_offset |
+		   (dev_priv->perf.oa.oa_buffer.size_exponent <<
+		    GEN7_OASTATUS1_BUFFER_SIZE_SHIFT)); /* tail */
 
 	/* Mark that we need updated tail pointers to read from... */
 	dev_priv->perf.oa.oa_buffer.tails[0].offset = INVALID_TAIL_PTR;
@@ -1421,7 +1419,8 @@ static void gen7_init_oa_buffer(struct drm_i915_private *dev_priv)
 	 * the assumption that new reports are being written to zeroed
 	 * memory...
 	 */
-	memset(dev_priv->perf.oa.oa_buffer.vaddr, 0, OA_BUFFER_SIZE);
+	memset(dev_priv->perf.oa.oa_buffer.vaddr, 0,
+	       dev_priv->perf.oa.oa_buffer.vma->size);
 
 	/* Maybe make ->pollin per-stream state if we support multiple
 	 * concurrent streams in the future.
@@ -1451,7 +1450,9 @@ static void gen8_init_oa_buffer(struct drm_i915_private *dev_priv)
 	 *  bit."
 	 */
 	I915_WRITE(GEN8_OABUFFER, gtt_offset |
-		   OABUFFER_SIZE_16M | GEN8_OABUFFER_MEM_SELECT_GGTT);
+		   (dev_priv->perf.oa.oa_buffer.size_exponent <<
+		    GEN8_OABUFFER_BUFFER_SIZE_SHIFT) |
+		   GEN8_OABUFFER_MEM_SELECT_GGTT);
 	I915_WRITE(GEN8_OATAILPTR, gtt_offset & GEN8_OATAILPTR_MASK);
 
 	/* Mark that we need updated tail pointers to read from... */
@@ -1479,7 +1480,8 @@ static void gen8_init_oa_buffer(struct drm_i915_private *dev_priv)
 	 * the assumption that new reports are being written to zeroed
 	 * memory...
 	 */
-	memset(dev_priv->perf.oa.oa_buffer.vaddr, 0, OA_BUFFER_SIZE);
+	memset(dev_priv->perf.oa.oa_buffer.vaddr, 0,
+	       dev_priv->perf.oa.oa_buffer.vma->size);
 
 	/*
 	 * Maybe make ->pollin per-stream state if we support multiple
@@ -1488,7 +1490,8 @@ static void gen8_init_oa_buffer(struct drm_i915_private *dev_priv)
 	dev_priv->perf.oa.pollin = false;
 }
 
-static int alloc_oa_buffer(struct drm_i915_private *dev_priv)
+static int alloc_oa_buffer(struct drm_i915_private *dev_priv, u32 size,
+			   int size_exponent)
 {
 	struct drm_i915_gem_object *bo;
 	struct i915_vma *vma;
@@ -1503,10 +1506,9 @@ static int alloc_oa_buffer(struct drm_i915_private *dev_priv)
 		goto unlock;
 	}
 
-	BUILD_BUG_ON_NOT_POWER_OF_2(OA_BUFFER_SIZE);
-	BUILD_BUG_ON(OA_BUFFER_SIZE < SZ_128K || OA_BUFFER_SIZE > SZ_16M);
+        BUG_ON(size < SZ_128K || size > SZ_16M);
 
-	bo = i915_gem_object_create(dev_priv, OA_BUFFER_SIZE);
+	bo = i915_gem_object_create(dev_priv, size);
 	if (IS_ERR(bo)) {
 		DRM_ERROR("Failed to allocate OA buffer\n");
 		ret = PTR_ERR(bo);
@@ -1518,12 +1520,14 @@ static int alloc_oa_buffer(struct drm_i915_private *dev_priv)
 		goto err_unref;
 
 	/* PreHSW required 512K alignment, HSW requires 16M */
-	vma = i915_gem_object_ggtt_pin(bo, NULL, 0, SZ_16M, 0);
+	vma = i915_gem_object_ggtt_pin(bo, NULL, 0, size, 0);
 	if (IS_ERR(vma)) {
 		ret = PTR_ERR(vma);
 		goto err_unref;
 	}
 	dev_priv->perf.oa.oa_buffer.vma = vma;
+	dev_priv->perf.oa.oa_buffer.size = size;
+	dev_priv->perf.oa.oa_buffer.size_exponent = size_exponent;
 
 	dev_priv->perf.oa.oa_buffer.vaddr =
 		i915_gem_object_pin_map(bo, I915_MAP_WB);
@@ -1532,9 +1536,10 @@ static int alloc_oa_buffer(struct drm_i915_private *dev_priv)
 		goto err_unpin;
 	}
 
-	DRM_DEBUG_DRIVER("OA Buffer initialized, gtt offset = 0x%x, vaddr = %p\n",
+	DRM_DEBUG_DRIVER("OA Buffer initialized, gtt offset = 0x%x, vaddr = %p, size = %u\n",
 			 i915_ggtt_offset(dev_priv->perf.oa.oa_buffer.vma),
-			 dev_priv->perf.oa.oa_buffer.vaddr);
+			 dev_priv->perf.oa.oa_buffer.vaddr,
+			 dev_priv->perf.oa.oa_buffer.size);
 
 	goto unlock;
 
@@ -2094,7 +2099,8 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
 	intel_runtime_pm_get(dev_priv);
 	intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
 
-	ret = alloc_oa_buffer(dev_priv);
+	ret = alloc_oa_buffer(dev_priv, props->oa_buffer_size,
+			      props->oa_buffer_size_exponent);
 	if (ret)
 		goto err_oa_buf_alloc;
 
@@ -2653,6 +2659,39 @@ static u64 oa_exponent_to_ns(struct drm_i915_private *dev_priv, int exponent)
 			 1000ULL * INTEL_INFO(dev_priv)->cs_timestamp_frequency_khz);
 }
 
+static int
+select_oa_buffer_size(struct drm_i915_private *i915,
+		      u64 requested_size,
+		      u32 *selected_size,
+		      int *selected_exponent)
+{
+	const u32 max_size = SZ_16M;
+
+	/*
+	 * When no size is specified, use the largest size supported
+	 * by all generations.
+	 */
+	if (!requested_size) {
+		*selected_size = SZ_16M;
+		*selected_exponent = 7;
+		return 0;
+	}
+
+	/* Start with the smallest OA buffer size. */
+	*selected_size = 128 * 1024;
+	*selected_exponent = 0;
+	while (requested_size > *selected_size &&
+	       *selected_size < max_size) {
+		*selected_size *= 2;
+		*selected_exponent += 1;
+	}
+
+	if (requested_size > *selected_size)
+		return -EINVAL; /* TODO: ENOMEM? ENODEV? */
+
+	return 0;
+}
+
 /**
  * read_properties_unlocked - validate + copy userspace stream open properties
  * @dev_priv: i915 device instance
@@ -2780,6 +2819,13 @@ static int read_properties_unlocked(struct drm_i915_private *dev_priv,
 			props->oa_periodic = true;
 			props->oa_period_exponent = value;
 			break;
+		case DRM_I915_PERF_PROP_OA_BUFFER_SIZE:
+			ret = select_oa_buffer_size(dev_priv, value,
+						    &props->oa_buffer_size,
+						    &props->oa_buffer_size_exponent);
+			if (ret)
+				return ret;
+			break;
 		case DRM_I915_PERF_PROP_MAX:
 			MISSING_CASE(id);
 			return -EINVAL;
@@ -2788,6 +2834,15 @@ static int read_properties_unlocked(struct drm_i915_private *dev_priv,
 		uprop += 2;
 	}
 
+	/* If no buffer size was requested, select the default one. */
+	if (!props->oa_buffer_size) {
+		if (select_oa_buffer_size(dev_priv, 0, &props->oa_buffer_size,
+					  &props->oa_buffer_size_exponent)) {
+			DRM_ERROR("Unable to select default OA buffer size\n");
+			return -EINVAL;
+		}
+	}
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 3bbf21ea5c57..e9fc5e4f6d87 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -595,12 +595,14 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
 #define GEN8_OABUFFER_UDW _MMIO(0x23b4)
 #define GEN8_OABUFFER _MMIO(0x2b14)
 #define  GEN8_OABUFFER_MEM_SELECT_GGTT      (1 << 0)  /* 0: PPGTT, 1: GGTT */
+#define  GEN8_OABUFFER_BUFFER_SIZE_SHIFT    3
 
 #define GEN7_OASTATUS1 _MMIO(0x2364)
 #define  GEN7_OASTATUS1_TAIL_MASK	    0xffffffc0
 #define  GEN7_OASTATUS1_COUNTER_OVERFLOW    (1 << 2)
 #define  GEN7_OASTATUS1_OABUFFER_OVERFLOW   (1 << 1)
 #define  GEN7_OASTATUS1_REPORT_LOST	    (1 << 0)
+#define  GEN7_OASTATUS1_BUFFER_SIZE_SHIFT   3
 
 #define GEN7_OASTATUS2 _MMIO(0x2368)
 #define  GEN7_OASTATUS2_HEAD_MASK           0xffffffc0
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index f22c4ee82871..b51a5777f627 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1558,6 +1558,14 @@ enum drm_i915_perf_property_id {
 	 */
 	DRM_I915_PERF_PROP_OA_EXPONENT,
 
+        /**
+         * Specify a global OA buffer size to be allocated in bytes.
+         * The driver will allocate a HW supported size that is at
+         * least as large as specified by this property. Larger sizes
+         * than what the HW supports will fail.
+         */
+        DRM_I915_PERF_PROP_OA_BUFFER_SIZE,
+
 	DRM_I915_PERF_PROP_MAX /* non-ABI */
 };
 
