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

Matthew Auld
2019-08-09T22:26:39Z

From: Abdiel Janulgue <abdiel.janulgue@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@linux.intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Matthew Auld <matthew.auld@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

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