[PATCH] drm/msm: Implement msm drm fb_mmap callback function

[PATCH] drm/msm: Implement msm drm fb_mmap callback function

[Hai Li]

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>
---
 drivers/gpu/drm/msm/msm_fbdev.c | 37 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/msm_fbdev.c b/drivers/gpu/drm/msm/msm_fbdev.c
index 4f4e7b4..2522f51 100644
--- a/drivers/gpu/drm/msm/msm_fbdev.c
+++ b/drivers/gpu/drm/msm/msm_fbdev.c
@@ -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)
 {
@@ -108,7 +139,11 @@ 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);
+	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) {
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation

Re: [PATCH] drm/msm: Implement msm drm fb_mmap callback function

[Rob Clark]

On Wed, Jun 18, 2014 at 4:55 PM, Hai Li <hali@codeaurora.org> wrote:
> This change implements msm drm specific fb_mmap function for fb device
> to properly map the fb address to userspace.
>

thanks, queued up on msm-next

BR,
-R

> Signed-off-by: Hai Li <hali@codeaurora.org>
> Signed-off-by: Stephane Viau <sviau@codeaurora.org>
> ---
>  drivers/gpu/drm/msm/msm_fbdev.c | 37 ++++++++++++++++++++++++++++++++++++-
>  1 file changed, 36 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/msm/msm_fbdev.c b/drivers/gpu/drm/msm/msm_fbdev.c
> index 4f4e7b4..2522f51 100644
> --- a/drivers/gpu/drm/msm/msm_fbdev.c
> +++ b/drivers/gpu/drm/msm/msm_fbdev.c
> @@ -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)
>  {
> @@ -108,7 +139,11 @@ 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);
> +       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) {
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> hosted by The Linux Foundation
>

Re: [PATCH] drm/msm: Implement msm drm fb_mmap callback function

[Stephen Boyd]

On 06/18/14 13:55, Hai Li wrote:
> diff --git a/drivers/gpu/drm/msm/msm_fbdev.c b/drivers/gpu/drm/msm/msm_fbdev.c
> index 4f4e7b4..2522f51 100644
> --- a/drivers/gpu/drm/msm/msm_fbdev.c
> +++ b/drivers/gpu/drm/msm/msm_fbdev.c
> @@ -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);

This can't go into some header file?

> +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;

unnecessary initialization to 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)
>  {
> @@ -108,7 +139,11 @@ 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: */

Is this comment still relevant?

> -	msm_gem_get_iova_locked(fbdev->bo, 0, &paddr);
> +	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) {


-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation

Re: [PATCH] drm/msm: Implement msm drm fb_mmap callback function

[Rob Clark]

On Thu, Jun 19, 2014 at 5:19 PM, Stephen Boyd <sboyd@codeaurora.org> wrote:
> On 06/18/14 13:55, Hai Li wrote:
>> diff --git a/drivers/gpu/drm/msm/msm_fbdev.c b/drivers/gpu/drm/msm/msm_fbdev.c
>> index 4f4e7b4..2522f51 100644
>> --- a/drivers/gpu/drm/msm/msm_fbdev.c
>> +++ b/drivers/gpu/drm/msm/msm_fbdev.c
>> @@ -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);
>
> This can't go into some header file?

it probably should go in msm_gem.h.. although this would be the one
special case where it is needed outside of msm_gem.c so I don't mind
too much

>> +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;
>
> unnecessary initialization to 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)
>>  {
>> @@ -108,7 +139,11 @@ 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: */
>
> Is this comment still relevant?

partially.. although it changes to the "can we make sure we can safely
pin on panic when fbcon is restored"..

probably a low priority thing, because we are not really tight on
device virtual space.

BR,
-R


>> -     msm_gem_get_iova_locked(fbdev->bo, 0, &paddr);
>> +     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) {
>
>
> --
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
> hosted by The Linux Foundation
>

[PATCH] drm/msm: Implement msm drm fb_mmap callback function

[Hai Li]

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>
---
 drivers/gpu/drm/msm/msm_fbdev.c | 38 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 36 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_fbdev.c b/drivers/gpu/drm/msm/msm_fbdev.c
index a752ab8..2694e90 100644
--- a/drivers/gpu/drm/msm/msm_fbdev.c
+++ b/drivers/gpu/drm/msm/msm_fbdev.c
@@ -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;
+
+	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 +135,11 @@ 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);
+	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) {
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation

Re: [PATCH] drm/msm: Implement msm drm fb_mmap callback function

[hali]

Re-send the patch to remove the unnecessary initialization and the comment

> 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>
> ---
>  drivers/gpu/drm/msm/msm_fbdev.c | 38
> ++++++++++++++++++++++++++++++++++++--
>  1 file changed, 36 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/msm_fbdev.c
> b/drivers/gpu/drm/msm/msm_fbdev.c
> index a752ab8..2694e90 100644
> --- a/drivers/gpu/drm/msm/msm_fbdev.c
> +++ b/drivers/gpu/drm/msm/msm_fbdev.c
> @@ -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;
> +
> +	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 +135,11 @@ 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);
> +	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) {
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> hosted by The Linux Foundation
>
>