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drm/msm: Implement msm drm fb_mmap callback function

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This change implements msm drm specific fb_mmap function for fb device
to properly map the fb address to userspace.

Signed-off-by: Hai Li <hali@codeaurora.org>
Signed-off-by: Stephane Viau <sviau@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com> (+ minor comment tweak)
This commit is contained in:
Hai Li 2014-06-18 16:55:27 -04:00 committed by Rob Clark
parent 3bf6c1ecae
commit 8f67da335d
1 changed files with 42 additions and 3 deletions
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45
drivers/gpu/drm/msm/msm_fbdev.c
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@ -19,6 +19,11 @@
#include "drm_crtc.h"
#include "drm_fb_helper.h"
#include "msm_gem.h"
extern int msm_gem_mmap_obj(struct drm_gem_object *obj,
struct vm_area_struct *vma);
static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma);
/*
* fbdev funcs, to implement legacy fbdev interface on top of drm driver
@ -43,6 +48,7 @@ static struct fb_ops msm_fb_ops = {
.fb_fillrect = sys_fillrect,
.fb_copyarea = sys_copyarea,
.fb_imageblit = sys_imageblit,
.fb_mmap = msm_fbdev_mmap,
.fb_check_var = drm_fb_helper_check_var,
.fb_set_par = drm_fb_helper_set_par,
@ -51,6 +57,31 @@ static struct fb_ops msm_fb_ops = {
.fb_setcmap = drm_fb_helper_setcmap,
};
static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
struct msm_fbdev *fbdev = to_msm_fbdev(helper);
struct drm_gem_object *drm_obj = fbdev->bo;
struct drm_device *dev = helper->dev;
int ret = 0;
if (drm_device_is_unplugged(dev))
return -ENODEV;
mutex_lock(&dev->struct_mutex);
ret = drm_gem_mmap_obj(drm_obj, drm_obj->size, vma);
mutex_unlock(&dev->struct_mutex);
if (ret) {
pr_err("%s:drm_gem_mmap_obj fail\n", __func__);
return ret;
}
return msm_gem_mmap_obj(drm_obj, vma);
}
static int msm_fbdev_create(struct drm_fb_helper *helper,
struct drm_fb_helper_surface_size *sizes)
{
@ -104,8 +135,16 @@ static int msm_fbdev_create(struct drm_fb_helper *helper,
mutex_lock(&dev->struct_mutex);
/* TODO implement our own fb_mmap so we don't need this: */
msm_gem_get_iova_locked(fbdev->bo, 0, &paddr);
/*
* NOTE: if we can be guaranteed to be able to map buffer
* in panic (ie. lock-safe, etc) we could avoid pinning the
* buffer now:
*/
ret = msm_gem_get_iova_locked(fbdev->bo, 0, &paddr);
if (ret) {
dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret);
goto fail;
}
fbi = framebuffer_alloc(0, dev->dev);
if (!fbi) {
@ -189,7 +228,7 @@ struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
struct msm_drm_private *priv = dev->dev_private;
struct msm_fbdev *fbdev = NULL;
struct drm_fb_helper *helper;
int ret = 0;
int ret;
fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
if (!fbdev)