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authorInki Dae2012-11-08 21:52:54 +0900
committerInki Dae2012-12-04 14:46:02 +0900
commit5b07c66059313fc998d28cf6775fd1a8bbb034aa (patch)
tree8a2cc3935ae3cb603b9ee5fbd65c680f2c832a03 /drivers/gpu/drm
parent2a3098ff6c2109557868f9f230f4725312dcb882 (diff)
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>
Diffstat (limited to 'drivers/gpu/drm')
-rw-r--r--drivers/gpu/drm/exynos/exynos_drm_gem.c75
1 files changed, 70 insertions, 5 deletions
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index 2cc6b3ae4e07..52187aec8692 100644
--- 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;