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* [PATCH] drm/exynox: Implement mmap as GEM object function
@ 2021-06-24  9:00 Thomas Zimmermann
  2021-07-08 12:05 ` Thomas Zimmermann
  0 siblings, 1 reply; 2+ messages in thread
From: Thomas Zimmermann @ 2021-06-24  9:00 UTC (permalink / raw)
  To: inki.dae, jy0922.shim, sw0312.kim, kyungmin.park, airlied,
	daniel, krzysztof.kozlowski, sumit.semwal, christian.koenig
  Cc: dri-devel, linux-arm-kernel, linux-samsung-soc, linux-media,
	linaro-mm-sig, Thomas Zimmermann

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@suse.de>
---
 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
-- 
2.32.0


^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [PATCH] drm/exynox: Implement mmap as GEM object function
  2021-06-24  9:00 [PATCH] drm/exynox: Implement mmap as GEM object function Thomas Zimmermann
@ 2021-07-08 12:05 ` Thomas Zimmermann
  0 siblings, 0 replies; 2+ messages in thread
From: Thomas Zimmermann @ 2021-07-08 12:05 UTC (permalink / raw)
  To: inki.dae, jy0922.shim, sw0312.kim, kyungmin.park, airlied,
	daniel, krzysztof.kozlowski, sumit.semwal, christian.koenig
  Cc: dri-devel, linux-arm-kernel, linux-samsung-soc, linux-media,
	linaro-mm-sig


[-- Attachment #1.1: Type: text/plain, Size: 7472 bytes --]

ping for review

Am 24.06.21 um 11:00 schrieb Thomas Zimmermann:
> 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@suse.de>
> ---
>   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
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer


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