[PATCH 16/22] drm/i915: do not map aperture if it is not available.

[Matthew Auld <matthew.auld@intel.com>]

From: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>

Skip both setup and cleanup of the aperture mapping if the HW doesn't
have an aperture bar.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 34 ++++++++++++++++++-----------
 1 file changed, 21 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 51b2087b214f..1be7b236f234 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -2827,7 +2827,9 @@ static void ggtt_cleanup_hw(struct i915_ggtt *ggtt)
 	mutex_unlock(&i915->drm.struct_mutex);
 
 	arch_phys_wc_del(ggtt->mtrr);
-	io_mapping_fini(&ggtt->iomap);
+
+	if (ggtt->iomap.size)
+		io_mapping_fini(&ggtt->iomap);
 }
 
 /**
@@ -3038,10 +3040,13 @@ static int gen8_gmch_probe(struct i915_ggtt *ggtt)
 	int err;
 
 	/* TODO: We're not aware of mappable constraints on gen8 yet */
-	ggtt->gmadr =
-		(struct resource) DEFINE_RES_MEM(pci_resource_start(pdev, 2),
-						 pci_resource_len(pdev, 2));
-	ggtt->mappable_end = resource_size(&ggtt->gmadr);
+	/* FIXME: We probably need to add do device_info or runtime_info */
+	if (!HAS_LMEM(dev_priv)) {
+		ggtt->gmadr =
+			(struct resource) DEFINE_RES_MEM(pci_resource_start(pdev, 2),
+							 pci_resource_len(pdev, 2));
+		ggtt->mappable_end = resource_size(&ggtt->gmadr);
+	}
 
 	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(39));
 	if (!err)
@@ -3267,15 +3272,18 @@ static int ggtt_init_hw(struct i915_ggtt *ggtt)
 	if (!HAS_LLC(i915) && !HAS_PPGTT(i915))
 		ggtt->vm.mm.color_adjust = i915_ggtt_color_adjust;
 
-	if (!io_mapping_init_wc(&ggtt->iomap,
-				ggtt->gmadr.start,
-				ggtt->mappable_end)) {
-		ggtt->vm.cleanup(&ggtt->vm);
-		ret = -EIO;
-		goto out;
-	}
+	if (ggtt->mappable_end) {
+		if (!io_mapping_init_wc(&ggtt->iomap,
+					ggtt->gmadr.start,
+					ggtt->mappable_end)) {
+			ggtt->vm.cleanup(&ggtt->vm);
+			ret = -EIO;
+			goto out;
+		}
 
-	ggtt->mtrr = arch_phys_wc_add(ggtt->gmadr.start, ggtt->mappable_end);
+		ggtt->mtrr = arch_phys_wc_add(ggtt->gmadr.start,
+					      ggtt->mappable_end);
+	}
 
 	i915_ggtt_init_fences(ggtt);
 
-- 
2.20.1

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