[PATCH v3 33/37] drm/i915: cpu-map based dumb buffers

[Matthew Auld]

From: Abdiel Janulgue <abdiel.janulgue at linux.intel.com>

If there is no aperture we can't use map_gtt to map dumb buffers, so we
need a cpu-map based path to do it. We prefer map_gtt on platforms that
do have aperture.

Signed-off-by: Abdiel Janulgue <abdiel.janulgue at linux.intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
Cc: Matthew Auld <matthew.auld at intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_mman.c       | 18 +++++++++++++++++-
 .../gpu/drm/i915/gem/i915_gem_object_types.h   |  1 +
 drivers/gpu/drm/i915/i915_drv.c                |  2 +-
 drivers/gpu/drm/i915/i915_drv.h                |  2 +-
 4 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
index 304ea578fd30..4fe83e31c1b3 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
@@ -500,7 +500,8 @@ static void i915_gem_object_release_mmap_offset(struct drm_i915_gem_object *obj)
 	list_for_each_entry(mmo, &obj->mmap_offsets, offset) {
 		if (mmo->mmap_type == I915_MMAP_TYPE_OFFSET_WC ||
 		    mmo->mmap_type == I915_MMAP_TYPE_OFFSET_WB ||
-		    mmo->mmap_type == I915_MMAP_TYPE_OFFSET_UC)
+		    mmo->mmap_type == I915_MMAP_TYPE_OFFSET_UC ||
+		    mmo->mmap_type == I915_MMAP_TYPE_DUMB_WC)
 			drm_vma_node_unmap(&mmo->vma_node,
 					   obj->base.dev->anon_inode->i_mapping);
 	}
@@ -602,6 +603,19 @@ __assign_gem_object_mmap_data(struct drm_file *file,
 	return ret;
 }
 
+int
+i915_gem_mmap_dumb(struct drm_file *file,
+		  struct drm_device *dev,
+		  u32 handle,
+		  u64 *offset)
+{
+	struct drm_i915_private *i915 = dev->dev_private;
+	enum i915_mmap_type mmap_type = HAS_MAPPABLE_APERTURE(i915) ?
+		I915_MMAP_TYPE_GTT : I915_MMAP_TYPE_DUMB_WC;
+
+	return __assign_gem_object_mmap_data(file, handle, mmap_type, offset);
+}
+
 /**
  * i915_gem_mmap_gtt_ioctl - prepare an object for GTT mmap'ing
  * @dev: DRM device
@@ -714,6 +728,7 @@ static void set_vmdata_mmap_offset(struct i915_mmap_offset *mmo, struct vm_area_
 {
 	switch (mmo->mmap_type) {
 	case I915_MMAP_TYPE_OFFSET_WC:
+	case I915_MMAP_TYPE_DUMB_WC:
 		vma->vm_page_prot =
 			pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
 		break;
@@ -801,6 +816,7 @@ int i915_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 	case I915_MMAP_TYPE_OFFSET_WC:
 	case I915_MMAP_TYPE_OFFSET_WB:
 	case I915_MMAP_TYPE_OFFSET_UC:
+	case I915_MMAP_TYPE_DUMB_WC:
 		set_vmdata_mmap_offset(mmo, vma);
 		break;
 	case I915_MMAP_TYPE_GTT:
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
index 4ea78d3c92a9..d280267689f9 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
@@ -67,6 +67,7 @@ enum i915_mmap_type {
 	I915_MMAP_TYPE_OFFSET_WC,
 	I915_MMAP_TYPE_OFFSET_WB,
 	I915_MMAP_TYPE_OFFSET_UC,
+	I915_MMAP_TYPE_DUMB_WC,
 };
 
 struct i915_mmap_offset {
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index cf390092c927..f6a3daf696f6 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -2762,7 +2762,7 @@ static struct drm_driver driver = {
 	.get_scanout_position = i915_get_crtc_scanoutpos,
 
 	.dumb_create = i915_gem_dumb_create,
-	.dumb_map_offset = i915_gem_mmap_gtt,
+	.dumb_map_offset = i915_gem_mmap_dumb,
 	.ioctls = i915_ioctls,
 	.num_ioctls = ARRAY_SIZE(i915_ioctls),
 	.fops = &i915_driver_fops,
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 5a5b90670e16..f93f55947b7c 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2363,7 +2363,7 @@ i915_mutex_lock_interruptible(struct drm_device *dev)
 int i915_gem_dumb_create(struct drm_file *file_priv,
 			 struct drm_device *dev,
 			 struct drm_mode_create_dumb *args);
-int i915_gem_mmap_gtt(struct drm_file *file_priv, struct drm_device *dev,
+int i915_gem_mmap_dumb(struct drm_file *file_priv, struct drm_device *dev,
 		      u32 handle, u64 *offset);
 int i915_gem_mmap_gtt_version(void);
 
-- 
2.20.1