[PATCH v4 5/6] drm/i915: allow memory region creators to alloc and free the region

[Robert Beckett <bob.beckett@xxxxxxxxxxxxx>]

add callbacks for alloc and free.
this allows region creators to allocate any extra storage they may
require.

Signed-off-by: Robert Beckett <bob.beckett@xxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/intel_memory_region.c | 16 +++++++++++++---
 drivers/gpu/drm/i915/intel_memory_region.h |  2 ++
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_memory_region.c b/drivers/gpu/drm/i915/intel_memory_region.c
index e38d2db1c3e3..3da07a712f90 100644
--- a/drivers/gpu/drm/i915/intel_memory_region.c
+++ b/drivers/gpu/drm/i915/intel_memory_region.c
@@ -231,7 +231,10 @@ intel_memory_region_create(struct drm_i915_private *i915,
 	struct intel_memory_region *mem;
 	int err;
 
-	mem = kzalloc(sizeof(*mem), GFP_KERNEL);
+	if (ops->alloc)
+		mem = ops->alloc();
+	else
+		mem = kzalloc(sizeof(*mem), GFP_KERNEL);
 	if (!mem)
 		return ERR_PTR(-ENOMEM);
 
@@ -265,7 +268,10 @@ intel_memory_region_create(struct drm_i915_private *i915,
 	if (mem->ops->release)
 		mem->ops->release(mem);
 err_free:
-	kfree(mem);
+	if (mem->ops->free)
+		mem->ops->free(mem);
+	else
+		kfree(mem);
 	return ERR_PTR(err);
 }
 
@@ -288,7 +294,11 @@ void intel_memory_region_destroy(struct intel_memory_region *mem)
 
 	GEM_WARN_ON(!list_empty_careful(&mem->objects.list));
 	mutex_destroy(&mem->objects.lock);
-	if (!ret)
+	if (ret)
+		return;
+	if (mem->ops->free)
+		mem->ops->free(mem);
+	else
 		kfree(mem);
 }
 
diff --git a/drivers/gpu/drm/i915/intel_memory_region.h b/drivers/gpu/drm/i915/intel_memory_region.h
index 3d8378c1b447..048955b5429f 100644
--- a/drivers/gpu/drm/i915/intel_memory_region.h
+++ b/drivers/gpu/drm/i915/intel_memory_region.h
@@ -61,6 +61,8 @@ struct intel_memory_region_ops {
 			   resource_size_t size,
 			   resource_size_t page_size,
 			   unsigned int flags);
+	struct intel_memory_region *(*alloc)(void);
+	void (*free)(struct intel_memory_region *mem);
 };
 
 struct intel_memory_region {
-- 
2.25.1