[PATCH 2/9] drm/exynox: Implement mmap as GEM object function

[Thomas Zimmermann <tzimmermann@xxxxxxx>]

Moving the driver-specific mmap code into a GEM object function allows
for using DRM helpers for various mmap callbacks.

The respective exynos functions are being removed. The file_operations
structure exynos_drm_driver_fops is now being created by the helper macro
DEFINE_DRM_GEM_FOPS().

Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
 drivers/gpu/drm/exynos/exynos_drm_drv.c   | 13 ++-----
 drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 20 ++---------
 drivers/gpu/drm/exynos/exynos_drm_gem.c   | 43 +++++------------------
 drivers/gpu/drm/exynos/exynos_drm_gem.h   |  5 ---
 4 files changed, 13 insertions(+), 68 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c 
b/drivers/gpu/drm/exynos/exynos_drm_drv.c
index e60257f1f24b..1d46751cad02 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
@@ -102,16 +102,7 @@ static const struct drm_ioctl_desc exynos_ioctls[] = {
                        DRM_RENDER_ALLOW),
 };
 
-static const struct file_operations exynos_drm_driver_fops = {
-       .owner          = THIS_MODULE,
-       .open           = drm_open,
-       .mmap           = exynos_drm_gem_mmap,
-       .poll           = drm_poll,
-       .read           = drm_read,
-       .unlocked_ioctl = drm_ioctl,
-       .compat_ioctl = drm_compat_ioctl,
-       .release        = drm_release,
-};
+DEFINE_DRM_GEM_FOPS(exynos_drm_driver_fops);
 
 static const struct drm_driver exynos_drm_driver = {
        .driver_features        = DRIVER_MODESET | DRIVER_GEM
@@ -124,7 +115,7 @@ static const struct drm_driver exynos_drm_driver = {
        .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
        .gem_prime_import       = exynos_drm_gem_prime_import,
        .gem_prime_import_sg_table      = exynos_drm_gem_prime_import_sg_table,
-       .gem_prime_mmap         = exynos_drm_gem_prime_mmap,
+       .gem_prime_mmap         = drm_gem_prime_mmap,
        .ioctls                 = exynos_ioctls,
        .num_ioctls             = ARRAY_SIZE(exynos_ioctls),
        .fops                   = &exynos_drm_driver_fops,
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c 
b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
index 5147f5929be7..02c97b9ca926 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
@@ -15,6 +15,7 @@
 #include <drm/drm_crtc.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_fourcc.h>
+#include <drm/drm_prime.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/exynos_drm.h>
 
@@ -39,25 +40,8 @@ static int exynos_drm_fb_mmap(struct fb_info *info,
        struct drm_fb_helper *helper = info->par;
        struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
        struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
-       unsigned long vm_size;
-       int ret;
-
-       vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
-
-       vm_size = vma->vm_end - vma->vm_start;
-
-       if (vm_size > exynos_gem->size)
-               return -EINVAL;
 
-       ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie,
-                            exynos_gem->dma_addr, exynos_gem->size,
-                            exynos_gem->dma_attrs);
-       if (ret < 0) {
-               DRM_DEV_ERROR(to_dma_dev(helper->dev), "failed to mmap.\n");
-               return ret;
-       }
-
-       return 0;
+       return drm_gem_prime_mmap(&exynos_gem->base, vma);
 }
 
 static const struct fb_ops exynos_drm_fb_ops = {
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c 
b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index 4396224227d1..c4b63902ee7a 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -17,6 +17,8 @@
 #include "exynos_drm_drv.h"
 #include "exynos_drm_gem.h"
 
+static int exynos_drm_gem_mmap(struct drm_gem_object *obj, struct 
vm_area_struct *vma);
+
 static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem, bool kvmap)
 {
        struct drm_device *dev = exynos_gem->base.dev;
@@ -135,6 +137,7 @@ static const struct vm_operations_struct 
exynos_drm_gem_vm_ops = {
 static const struct drm_gem_object_funcs exynos_drm_gem_object_funcs = {
        .free = exynos_drm_gem_free_object,
        .get_sg_table = exynos_drm_gem_prime_get_sg_table,
+       .mmap = exynos_drm_gem_mmap,
        .vm_ops = &exynos_drm_gem_vm_ops,
 };
 
@@ -354,12 +357,16 @@ int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
        return 0;
 }
 
-static int exynos_drm_gem_mmap_obj(struct drm_gem_object *obj,
-                                  struct vm_area_struct *vma)
+static int exynos_drm_gem_mmap(struct drm_gem_object *obj, struct 
vm_area_struct *vma)
 {
        struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
        int ret;
 
+       if (obj->import_attach)
+               return dma_buf_mmap(obj->dma_buf, vma, 0);
+
+       vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
+
        DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "flags = 0x%x\n",
                          exynos_gem->flags);
 
@@ -385,26 +392,6 @@ static int exynos_drm_gem_mmap_obj(struct drm_gem_object 
*obj,
        return ret;
 }
 
-int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
-{
-       struct drm_gem_object *obj;
-       int ret;
-
-       /* set vm_area_struct. */
-       ret = drm_gem_mmap(filp, vma);
-       if (ret < 0) {
-               DRM_ERROR("failed to mmap.\n");
-               return ret;
-       }
-
-       obj = vma->vm_private_data;
-
-       if (obj->import_attach)
-               return dma_buf_mmap(obj->dma_buf, vma, 0);
-
-       return exynos_drm_gem_mmap_obj(obj, vma);
-}
-
 /* low-level interface prime helpers */
 struct drm_gem_object *exynos_drm_gem_prime_import(struct drm_device *dev,
                                            struct dma_buf *dma_buf)
@@ -466,15 +453,3 @@ exynos_drm_gem_prime_import_sg_table(struct drm_device 
*dev,
        exynos_gem->sgt = sgt;
        return &exynos_gem->base;
 }
-
-int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj,
-                             struct vm_area_struct *vma)
-{
-       int ret;
-
-       ret = drm_gem_mmap_obj(obj, obj->size, vma);
-       if (ret < 0)
-               return ret;
-
-       return exynos_drm_gem_mmap_obj(obj, vma);
-}
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.h 
b/drivers/gpu/drm/exynos/exynos_drm_gem.h
index a23272fb96fb..79d7e1a87419 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.h
@@ -96,9 +96,6 @@ int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
                               struct drm_device *dev,
                               struct drm_mode_create_dumb *args);
 
-/* set vm_flags and we can change the vm attribute to other one at here. */
-int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
-
 /* low-level interface prime helpers */
 struct drm_gem_object *exynos_drm_gem_prime_import(struct drm_device *dev,
                                            struct dma_buf *dma_buf);
@@ -107,7 +104,5 @@ struct drm_gem_object *
 exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
                                     struct dma_buf_attachment *attach,
                                     struct sg_table *sgt);
-int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj,
-                             struct vm_area_struct *vma);
 
 #endif
-- 
2.31.1