diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
index c5a4035c99cd..0eb66c55bbf3 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
@@ -77,9 +77,9 @@ void i915_gem_stolen_remove_node(struct drm_i915_private *i915,
 	mutex_unlock(&i915->mm.stolen_lock);
 }
 
-static bool valid_stolen_size(struct resource *dsm)
+static bool valid_stolen_size(struct drm_i915_private *i915, struct resource *dsm)
 {
-	return dsm->start != 0 && dsm->end > dsm->start;
+	return (dsm->start != 0 || HAS_BAR2_SMEM_STOLEN(i915)) && dsm->end > dsm->start;
 }
 
 static int adjust_stolen(struct drm_i915_private *i915,
@@ -88,7 +88,7 @@ static int adjust_stolen(struct drm_i915_private *i915,
 	struct i915_ggtt *ggtt = to_gt(i915)->ggtt;
 	struct intel_uncore *uncore = ggtt->vm.gt->uncore;
 
-	if (!valid_stolen_size(dsm))
+	if (!valid_stolen_size(i915, dsm))
 		return -EINVAL;
 
 	/*
@@ -135,7 +135,7 @@ static int adjust_stolen(struct drm_i915_private *i915,
 		}
 	}
 
-	if (!valid_stolen_size(dsm))
+	if (!valid_stolen_size(i915, dsm))
 		return -EINVAL;
 
 	return 0;
@@ -148,9 +148,10 @@ static int request_smem_stolen(struct drm_i915_private *i915,
 
 	/*
 	 * With stolen lmem, we don't need to request system memory for the
-	 * address range since it's local to the gpu.
+	 * address range since it's local to the gpu and in some IGFX devices
+	 * BAR2 is exposed as stolen
 	 */
-	if (HAS_LMEM(i915))
+	if (HAS_LMEM(i915) || HAS_BAR2_SMEM_STOLEN(i915))
 		return 0;
 
 	/*
@@ -385,8 +386,6 @@ static void icl_get_stolen_reserved(struct drm_i915_private *i915,
 
 	drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = 0x%016llx\n", reg_val);
 
-	*base = reg_val & GEN11_STOLEN_RESERVED_ADDR_MASK;
-
 	switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
 	case GEN8_STOLEN_RESERVED_1M:
 		*size = 1024 * 1024;
@@ -404,6 +403,12 @@ static void icl_get_stolen_reserved(struct drm_i915_private *i915,
 		*size = 8 * 1024 * 1024;
 		MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
 	}
+
+	if (HAS_BAR2_SMEM_STOLEN(i915))
+		/* the base is initialized to stolen top so subtract size to get base */
+		*base -= *size;
+	else
+		*base = reg_val & GEN11_STOLEN_RESERVED_ADDR_MASK;
 }
 
 /*
@@ -833,6 +838,34 @@ static const struct intel_memory_region_ops i915_region_stolen_lmem_ops = {
 	.init_object = _i915_gem_object_stolen_init,
 };
 
+static int mtl_get_gms_size(struct intel_uncore *uncore)
+{
+	u16 ggc, gms;
+
+	ggc = intel_uncore_read16(uncore, GGC);
+
+	/* check GGMS, should be fixed 0x3 (8MB) */
+	if ((ggc & GGMS_MASK) != GGMS_MASK)
+		return -EIO;
+
+	/* return valid GMS value, -EIO if invalid */
+	gms = (ggc & GMS_MASK) >> GMS_SHIFT;
+	switch (gms) {
+	case 0x0 ... 0x10:
+		return gms * 32;
+	case 0x20:
+		return 1024;
+	case 0x30:
+		return 1536;
+	case 0x40:
+		return 2048;
+	case 0xf0 ... 0xfe:
+		return (gms - 0xf0 + 1) * 4;
+	default:
+		return -EIO;
+	}
+}
+
 struct intel_memory_region *
 i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, u16 type,
 			   u16 instance)
@@ -843,6 +876,7 @@ i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, u16 type,
 	struct intel_memory_region *mem;
 	resource_size_t io_start, io_size;
 	resource_size_t min_page_size;
+	int ret;
 
 	if (WARN_ON_ONCE(instance))
 		return ERR_PTR(-ENODEV);
@@ -850,12 +884,8 @@ i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, u16 type,
 	if (!i915_pci_resource_valid(pdev, GEN12_LMEM_BAR))
 		return ERR_PTR(-ENXIO);
 
-	/* Use DSM base address instead for stolen memory */
-	dsm_base = intel_uncore_read64(uncore, GEN12_DSMBASE) & GEN12_BDSM_MASK;
-	if (IS_DG1(uncore->i915)) {
+	if (HAS_BAR2_SMEM_STOLEN(i915) || IS_DG1(i915)) {
 		lmem_size = pci_resource_len(pdev, GEN12_LMEM_BAR);
-		if (WARN_ON(lmem_size < dsm_base))
-			return ERR_PTR(-ENODEV);
 	} else {
 		resource_size_t lmem_range;
 
@@ -864,13 +894,39 @@ i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, u16 type,
 		lmem_size *= SZ_1G;
 	}
 
-	dsm_size = lmem_size - dsm_base;
-	if (pci_resource_len(pdev, GEN12_LMEM_BAR) < lmem_size) {
+	if (HAS_BAR2_SMEM_STOLEN(i915)) {
+		/*
+		 * MTL dsm size is in GGC register, not the bar size.
+		 * also MTL uses offset to DSMBASE in ptes, so i915
+		 * uses dsm_base = 0 to setup stolen region.
+		 */
+		ret = mtl_get_gms_size(uncore);
+		if (ret < 0) {
+			drm_err(&i915->drm, "invalid MTL GGC register setting\n");
+			return ERR_PTR(ret);
+		}
+
+		dsm_base = 0;
+		dsm_size = (resource_size_t)(ret * SZ_1M);
+
+		GEM_BUG_ON(pci_resource_len(pdev, GEN12_LMEM_BAR) != 256 * SZ_1M);
+		GEM_BUG_ON((dsm_size + 8 * SZ_1M) > lmem_size);
+	} else {
+		/* Use DSM base address instead for stolen memory */
+		dsm_base = intel_uncore_read64(uncore, GEN12_DSMBASE);
+		if (WARN_ON(lmem_size < dsm_base))
+			return ERR_PTR(-ENODEV);
+		dsm_size = lmem_size - dsm_base;
+	}
+
+	io_size = dsm_size;
+	if (pci_resource_len(pdev, GEN12_LMEM_BAR) < dsm_size) {
 		io_start = 0;
 		io_size = 0;
+	} else if (HAS_BAR2_SMEM_STOLEN(i915)) {
+		io_start = pci_resource_start(pdev, GEN12_LMEM_BAR) + 8 * SZ_1M;
 	} else {
 		io_start = pci_resource_start(pdev, GEN12_LMEM_BAR) + dsm_base;
-		io_size = dsm_size;
 	}
 
 	min_page_size = HAS_64K_PAGES(i915) ? I915_GTT_PAGE_SIZE_64K :
diff --git a/drivers/gpu/drm/i915/gt/intel_ggtt.c b/drivers/gpu/drm/i915/gt/intel_ggtt.c
index 30cf5c3369d9..b31fe0fb013f 100644
--- a/drivers/gpu/drm/i915/gt/intel_ggtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ggtt.c
@@ -931,7 +931,7 @@ static int gen8_gmch_probe(struct i915_ggtt *ggtt)
 	unsigned int size;
 	u16 snb_gmch_ctl;
 
-	if (!HAS_LMEM(i915)) {
+	if (!HAS_LMEM(i915) && !HAS_BAR2_SMEM_STOLEN(i915)) {
 		if (!i915_pci_resource_valid(pdev, GTT_APERTURE_BAR))
 			return -ENXIO;
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index d830d52ded5d..b33ba0d49bbd 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -975,6 +975,9 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 
 #define HAS_ONE_EU_PER_FUSE_BIT(i915)	(INTEL_INFO(i915)->has_one_eu_per_fuse_bit)
 
+#define HAS_BAR2_SMEM_STOLEN(i915) (!HAS_LMEM(i915) && \
+				    GRAPHICS_VER_FULL(i915) >= IP_VER(12, 70))
+
 /* intel_device_info.c */
 static inline struct intel_device_info *
 mkwrite_device_info(struct drm_i915_private *dev_priv)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 5003a5ffbc6a..3ace2d6b4961 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7967,6 +7967,11 @@ enum skl_power_gate {
 							   _ICL_PIPE_DSS_CTL2_PB, \
 							   _ICL_PIPE_DSS_CTL2_PC)
 
+#define GGC				_MMIO(0x108040)
+#define   GMS_MASK			REG_GENMASK(15, 8)
+#define   GMS_SHIFT			8
+#define   GGMS_MASK			REG_GENMASK(7, 6)
+
 #define GEN12_GSMBASE			_MMIO(0x108100)
 #define GEN12_DSMBASE			_MMIO(0x1080C0)
 #define   GEN12_BDSM_MASK		REG_GENMASK64(63, 20)
