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authorDaniel Kurtz <djkurtz@chromium.org>2015-01-12 14:58:23 +0800
committerMark Yao <mark.yao@rock-chips.com>2015-03-16 10:07:12 +0800
commitf76c83b580043d55b2899719da61fe000839812d (patch)
treeade110f4c117f8c16d952640073e1f2984ccceb8 /drivers/gpu/drm/rockchip
parent03be70050c85768e9ce7c0d0887110d1b629e127 (diff)
downloadop-kernel-dev-f76c83b580043d55b2899719da61fe000839812d.zip
op-kernel-dev-f76c83b580043d55b2899719da61fe000839812d.tar.gz
drm/rockchip: Only alloc a kmap for fbdev gem object
In general, the data in drm/rockchip GEM objects is never accessed by the kernel. The objects are either accessed by a GPU, by display controller DMA, or by mmap'ing them to user space. Thus, these buffers need not be mapped into kernel address space. The only exception is the fbdev framebuffer(s), which may be written in-kernel by fbcon. Signed-off-by: Daniel Kurtz <djkurtz@chromium.org> Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
Diffstat (limited to 'drivers/gpu/drm/rockchip')
-rw-r--r--drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c2
-rw-r--r--drivers/gpu/drm/rockchip/rockchip_drm_gem.c17
-rw-r--r--drivers/gpu/drm/rockchip/rockchip_drm_gem.h3
3 files changed, 15 insertions, 7 deletions
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c b/drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c
index a5d889a..17d1954 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c
@@ -71,7 +71,7 @@ static int rockchip_drm_fbdev_create(struct drm_fb_helper *helper,
size = mode_cmd.pitches[0] * mode_cmd.height;
- rk_obj = rockchip_gem_create_object(dev, size);
+ rk_obj = rockchip_gem_create_object(dev, size, true);
if (IS_ERR(rk_obj))
return -ENOMEM;
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
index 7ca8799e..eb2282c 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
@@ -22,7 +22,8 @@
#include "rockchip_drm_drv.h"
#include "rockchip_drm_gem.h"
-static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj)
+static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
+ bool alloc_kmap)
{
struct drm_gem_object *obj = &rk_obj->base;
struct drm_device *drm = obj->dev;
@@ -30,7 +31,9 @@ static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj)
init_dma_attrs(&rk_obj->dma_attrs);
dma_set_attr(DMA_ATTR_WRITE_COMBINE, &rk_obj->dma_attrs);
- /* TODO(djkurtz): Use DMA_ATTR_NO_KERNEL_MAPPING except for fbdev */
+ if (!alloc_kmap)
+ dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs);
+
rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
&rk_obj->dma_addr, GFP_KERNEL,
&rk_obj->dma_attrs);
@@ -103,7 +106,8 @@ int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
}
struct rockchip_gem_object *
- rockchip_gem_create_object(struct drm_device *drm, unsigned int size)
+ rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
+ bool alloc_kmap)
{
struct rockchip_gem_object *rk_obj;
struct drm_gem_object *obj;
@@ -119,7 +123,7 @@ struct rockchip_gem_object *
drm_gem_private_object_init(drm, obj, size);
- ret = rockchip_gem_alloc_buf(rk_obj);
+ ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
if (ret)
goto err_free_rk_obj;
@@ -163,7 +167,7 @@ rockchip_gem_create_with_handle(struct drm_file *file_priv,
struct drm_gem_object *obj;
int ret;
- rk_obj = rockchip_gem_create_object(drm, size);
+ rk_obj = rockchip_gem_create_object(drm, size, false);
if (IS_ERR(rk_obj))
return ERR_CAST(rk_obj);
@@ -282,6 +286,9 @@ void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
{
struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
+ if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs))
+ return NULL;
+
return rk_obj->kvaddr;
}
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.h b/drivers/gpu/drm/rockchip/rockchip_drm_gem.h
index 67bcebe..ad22618 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.h
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.h
@@ -41,7 +41,8 @@ int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
struct vm_area_struct *vma);
struct rockchip_gem_object *
- rockchip_gem_create_object(struct drm_device *drm, unsigned int size);
+ rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
+ bool alloc_kmap);
void rockchip_gem_free_object(struct drm_gem_object *obj);
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