drm/exynos: add vm_ops to specific gem mmaper

Changelog v3:
use drm_file's file object instead of gem object's
- gem object's file represents the shmem storage so
  process-unique file object should be used instead.

Changelog v2:
call mutex_lock before drm_vm_open_locked is called.

Changelog v1:
This patch makes it takes a reference to gem object when
specific gem mmap is requested. For this, it sets
dev->driver->gem_vm_ops to vma->vm_ops.

And this patch is based on exynos-drm-next-iommu branch of
	git://git.kernel.org/pub/scm/linux/kernel/git/daeinki/drm-exynos

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index 2cc6b3ae4e07dcc7c50edb7df48df3ec90f6a294..52187aec8692e2b475dedde4ec3b2fb68108febb 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -349,17 +349,53 @@ int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
                        &args->offset);
 }
 
+static struct drm_file *exynos_drm_find_drm_file(struct drm_device *drm_dev,
+                                                       struct file *filp)
+{
+       struct drm_file *file_priv;
+
+       mutex_lock(&drm_dev->struct_mutex);
+
+       /* find current process's drm_file from filelist. */
+       list_for_each_entry(file_priv, &drm_dev->filelist, lhead) {
+               if (file_priv->filp == filp) {
+                       mutex_unlock(&drm_dev->struct_mutex);
+                       return file_priv;
+               }
+       }
+
+       mutex_unlock(&drm_dev->struct_mutex);
+       WARN_ON(1);
+
+       return ERR_PTR(-EFAULT);
+}
+
 static int exynos_drm_gem_mmap_buffer(struct file *filp,
                                      struct vm_area_struct *vma)
 {
        struct drm_gem_object *obj = filp->private_data;
        struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
+       struct drm_device *drm_dev = obj->dev;
        struct exynos_drm_gem_buf *buffer;
+       struct drm_file *file_priv;
        unsigned long vm_size;
+       int ret;
 
        DRM_DEBUG_KMS("%s\n", __FILE__);
 
        vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
+       vma->vm_private_data = obj;
+       vma->vm_ops = drm_dev->driver->gem_vm_ops;
+
+       /* restore it to driver's fops. */
+       filp->f_op = fops_get(drm_dev->driver->fops);
+
+       file_priv = exynos_drm_find_drm_file(drm_dev, filp);
+       if (IS_ERR(file_priv))
+               return PTR_ERR(file_priv);
+
+       /* restore it to drm_file. */
+       filp->private_data = file_priv;
 
        update_vm_cache_attr(exynos_gem_obj, vma);
 
@@ -375,9 +411,25 @@ static int exynos_drm_gem_mmap_buffer(struct file *filp,
        if (vm_size > buffer->size)
                return -EINVAL;
 
-       return dma_mmap_attrs(obj->dev->dev, vma, buffer->kvaddr,
+       ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->kvaddr,
                                buffer->dma_addr, buffer->size,
                                &buffer->dma_attrs);
+       if (ret < 0) {
+               DRM_ERROR("failed to mmap.\n");
+               return ret;
+       }
+
+       /*
+        * take a reference to this mapping of the object. And this reference
+        * is unreferenced by the corresponding vm_close call.
+        */
+       drm_gem_object_reference(obj);
+
+       mutex_lock(&drm_dev->struct_mutex);
+       drm_vm_open_locked(drm_dev, vma);
+       mutex_unlock(&drm_dev->struct_mutex);
+
+       return 0;
 }
 
 static const struct file_operations exynos_drm_gem_fops = {
@@ -404,16 +456,29 @@ int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
                return -EINVAL;
        }
 
-       obj->filp->f_op = &exynos_drm_gem_fops;
-       obj->filp->private_data = obj;
+       /*
+        * Set specific mmper's fops. And it will be restored by
+        * exynos_drm_gem_mmap_buffer to dev->driver->fops.
+        * This is used to call specific mapper temporarily.
+        */
+       file_priv->filp->f_op = &exynos_drm_gem_fops;
+
+       /*
+        * Set gem object to private_data so that specific mmaper
+        * can get the gem object. And it will be restored by
+        * exynos_drm_gem_mmap_buffer to drm_file.
+        */
+       file_priv->filp->private_data = obj;
 
-       addr = vm_mmap(obj->filp, 0, args->size,
+       addr = vm_mmap(file_priv->filp, 0, args->size,
                        PROT_READ | PROT_WRITE, MAP_SHARED, 0);
 
        drm_gem_object_unreference_unlocked(obj);
 
-       if (IS_ERR((void *)addr))
+       if (IS_ERR((void *)addr)) {
+               file_priv->filp->private_data = file_priv;
                return PTR_ERR((void *)addr);
+       }
 
        args->mapped = addr;