linux-kernel - [PATCH 2/5] drm: Add and export function drm_gem_cma_dumb_create

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Date:   Mon,  2 Nov 2020 22:06:48 +0000
From:   Paul Cercueil <paul@...pouillou.net>
To:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>
Cc:     od@...c.me, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH 2/5] drm: Add and export function drm_gem_cma_dumb_create_noncoherent

This function can be used by drivers to create dumb buffers with
non-coherent backing memory.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---
 drivers/gpu/drm/drm_gem_cma_helper.c | 37 +++++++++++++++++++++++++---
 include/drm/drm_gem_cma_helper.h     |  4 +++
 2 files changed, 37 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c b/drivers/gpu/drm/drm_gem_cma_helper.c
index 717871d741fb..3bdd67795e20 100644
--- a/drivers/gpu/drm/drm_gem_cma_helper.c
+++ b/drivers/gpu/drm/drm_gem_cma_helper.c
@@ -163,6 +163,7 @@ EXPORT_SYMBOL_GPL(drm_gem_cma_create_noncoherent);
  * @drm: DRM device
  * @size: size of the object to allocate
  * @handle: return location for the GEM handle
+ * @noncoherent: allocate object with non-coherent cache attribute
  *
  * This function creates a CMA GEM object, allocating a physically contiguous
  * chunk of memory as backing store. The GEM object is then added to the list
@@ -175,13 +176,13 @@ EXPORT_SYMBOL_GPL(drm_gem_cma_create_noncoherent);
 static struct drm_gem_cma_object *
 drm_gem_cma_create_with_handle(struct drm_file *file_priv,
 			       struct drm_device *drm, size_t size,
-			       uint32_t *handle)
+			       uint32_t *handle, bool noncoherent)
 {
 	struct drm_gem_cma_object *cma_obj;
 	struct drm_gem_object *gem_obj;
 	int ret;
 
-	cma_obj = drm_gem_cma_create(drm, size);
+	cma_obj = drm_gem_cma_create_with_cache_param(drm, size, noncoherent);
 	if (IS_ERR(cma_obj))
 		return cma_obj;
 
@@ -258,7 +259,7 @@ int drm_gem_cma_dumb_create_internal(struct drm_file *file_priv,
 		args->size = args->pitch * args->height;
 
 	cma_obj = drm_gem_cma_create_with_handle(file_priv, drm, args->size,
-						 &args->handle);
+						 &args->handle, false);
 	return PTR_ERR_OR_ZERO(cma_obj);
 }
 EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_create_internal);
@@ -291,11 +292,39 @@ int drm_gem_cma_dumb_create(struct drm_file *file_priv,
 	args->size = args->pitch * args->height;
 
 	cma_obj = drm_gem_cma_create_with_handle(file_priv, drm, args->size,
-						 &args->handle);
+						 &args->handle, false);
 	return PTR_ERR_OR_ZERO(cma_obj);
 }
 EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_create);
 
+/**
+ * drm_gem_cma_dumb_create_noncoherent - create a dumb buffer object with
+ *     non-coherent cache attribute
+ * @file_priv: DRM file-private structure to create the dumb buffer for
+ * @drm: DRM device
+ * @args: IOCTL data
+ *
+ * Same as drm_gem_cma_dumb_create, but the dumb buffer object created has
+ * the non-coherent cache attribute set.
+ *
+ * Returns:
+ * 0 on success or a negative error code on failure.
+ */
+int drm_gem_cma_dumb_create_noncoherent(struct drm_file *file_priv,
+					struct drm_device *drm,
+					struct drm_mode_create_dumb *args)
+{
+	struct drm_gem_cma_object *cma_obj;
+
+	args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
+	args->size = args->pitch * args->height;
+
+	cma_obj = drm_gem_cma_create_with_handle(file_priv, drm, args->size,
+						 &args->handle, true);
+	return PTR_ERR_OR_ZERO(cma_obj);
+}
+EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_create_noncoherent);
+
 const struct vm_operations_struct drm_gem_cma_vm_ops = {
 	.open = drm_gem_vm_open,
 	.close = drm_gem_vm_close,
diff --git a/include/drm/drm_gem_cma_helper.h b/include/drm/drm_gem_cma_helper.h
index 071c73ad7177..d0e6a1cd0950 100644
--- a/include/drm/drm_gem_cma_helper.h
+++ b/include/drm/drm_gem_cma_helper.h
@@ -76,6 +76,10 @@ int drm_gem_cma_dumb_create(struct drm_file *file_priv,
 			    struct drm_device *drm,
 			    struct drm_mode_create_dumb *args);
 
+int drm_gem_cma_dumb_create_noncoherent(struct drm_file *file_priv,
+					struct drm_device *drm,
+					struct drm_mode_create_dumb *args);
+
 /* set vm_flags and we can change the VM attribute to other one at here */
 int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma);
 
-- 
2.28.0