[PATCH v3 1/2] drm: call drm_gem_object_funcs.mmap with fake offset

[PATCH v3 1/2] drm: call drm_gem_object_funcs.mmap with fake offset

[Gerd Hoffmann]

The fake offset is going to stay, so change the calling convention for
drm_gem_object_funcs.mmap to include the fake offset.  Update all users
accordingly.

Note that this reverts 83b8a6f242ea ("drm/gem: Fix mmap fake offset
handling for drm_gem_object_funcs.mmap") and on top then adds the fake
offset to  drm_gem_prime_mmap to make sure all paths leading to
obj->funcs->mmap are consistent.

v3: move fake-offset tweak in drm_gem_prime_mmap() so we have this code
    only once in the function (Rob Herring).

Fixes: 83b8a6f242ea ("drm/gem: Fix mmap fake offset handling for drm_gem_object_funcs.mmap")
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Rob Herring <robh@kernel.org>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 include/drm/drm_gem.h                  | 4 +---
 drivers/gpu/drm/drm_gem.c              | 3 ---
 drivers/gpu/drm/drm_gem_shmem_helper.c | 3 +++
 drivers/gpu/drm/drm_prime.c            | 5 +++--
 drivers/gpu/drm/ttm/ttm_bo_vm.c        | 7 -------
 5 files changed, 7 insertions(+), 15 deletions(-)

diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
index 97a48165642c..0b375069cd48 100644
--- a/include/drm/drm_gem.h
+++ b/include/drm/drm_gem.h
@@ -159,9 +159,7 @@ struct drm_gem_object_funcs {
 	 *
 	 * The callback is used by by both drm_gem_mmap_obj() and
 	 * drm_gem_prime_mmap().  When @mmap is present @vm_ops is not
-	 * used, the @mmap callback must set vma->vm_ops instead. The @mmap
-	 * callback is always called with a 0 offset. The caller will remove
-	 * the fake offset as necessary.
+	 * used, the @mmap callback must set vma->vm_ops instead.
 	 */
 	int (*mmap)(struct drm_gem_object *obj, struct vm_area_struct *vma);
 
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 2f2b889096b0..56f42e0f2584 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -1106,9 +1106,6 @@ int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
 		return -EINVAL;
 
 	if (obj->funcs && obj->funcs->mmap) {
-		/* Remove the fake offset */
-		vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
-
 		ret = obj->funcs->mmap(obj, vma);
 		if (ret)
 			return ret;
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index 0810d3ef6961..a421a2eed48a 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -528,6 +528,9 @@ int drm_gem_shmem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
 	struct drm_gem_shmem_object *shmem;
 	int ret;
 
+	/* Remove the fake offset */
+	vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
+
 	shmem = to_drm_gem_shmem_obj(obj);
 
 	ret = drm_gem_shmem_get_pages(shmem);
diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index 0814211b0f3f..a0f929c7117b 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -713,6 +713,9 @@ int drm_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
 	struct file *fil;
 	int ret;
 
+	/* Add the fake offset */
+	vma->vm_pgoff += drm_vma_node_start(&obj->vma_node);
+
 	if (obj->funcs && obj->funcs->mmap) {
 		ret = obj->funcs->mmap(obj, vma);
 		if (ret)
@@ -737,8 +740,6 @@ int drm_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
 	if (ret)
 		goto out;
 
-	vma->vm_pgoff += drm_vma_node_start(&obj->vma_node);
-
 	ret = obj->dev->driver->fops->mmap(fil, vma);
 
 	drm_vma_node_revoke(&obj->vma_node, priv);
diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index e6495ca2630b..3e8c3de91ae4 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -514,13 +514,6 @@ EXPORT_SYMBOL(ttm_bo_mmap);
 int ttm_bo_mmap_obj(struct vm_area_struct *vma, struct ttm_buffer_object *bo)
 {
 	ttm_bo_get(bo);
-
-	/*
-	 * FIXME: &drm_gem_object_funcs.mmap is called with the fake offset
-	 * removed. Add it back here until the rest of TTM works without it.
-	 */
-	vma->vm_pgoff += drm_vma_node_start(&bo->base.vma_node);
-
 	ttm_bo_mmap_vma_setup(bo, vma);
 	return 0;
 }
-- 
2.18.1

Re: [PATCH v3 1/2] drm: call drm_gem_object_funcs.mmap with fake offset

[Gerd Hoffmann]

On Wed, Nov 27, 2019 at 10:25:22AM +0100, Gerd Hoffmann wrote:
> The fake offset is going to stay, so change the calling convention for
> drm_gem_object_funcs.mmap to include the fake offset.  Update all users
> accordingly.
> 
> Note that this reverts 83b8a6f242ea ("drm/gem: Fix mmap fake offset
> handling for drm_gem_object_funcs.mmap") and on top then adds the fake
> offset to  drm_gem_prime_mmap to make sure all paths leading to
> obj->funcs->mmap are consistent.
> 
> v3: move fake-offset tweak in drm_gem_prime_mmap() so we have this code
>     only once in the function (Rob Herring).

Now this series fails in Intel CI.  Can't see why though.  The
difference between v2 and v3 is just the place where vma->vm_pgoff gets
updated, and no code between the v2 and v3 location touches vma ...

confused,
  Gerd

Re: [PATCH v3 1/2] drm: call drm_gem_object_funcs.mmap with fake offset

[Daniel Vetter]

On Thu, Nov 28, 2019 at 12:39:30PM +0100, Gerd Hoffmann wrote:
> On Wed, Nov 27, 2019 at 10:25:22AM +0100, Gerd Hoffmann wrote:
> > The fake offset is going to stay, so change the calling convention for
> > drm_gem_object_funcs.mmap to include the fake offset.  Update all users
> > accordingly.
> > 
> > Note that this reverts 83b8a6f242ea ("drm/gem: Fix mmap fake offset
> > handling for drm_gem_object_funcs.mmap") and on top then adds the fake
> > offset to  drm_gem_prime_mmap to make sure all paths leading to
> > obj->funcs->mmap are consistent.
> > 
> > v3: move fake-offset tweak in drm_gem_prime_mmap() so we have this code
> >     only once in the function (Rob Herring).
> 
> Now this series fails in Intel CI.  Can't see why though.  The
> difference between v2 and v3 is just the place where vma->vm_pgoff gets
> updated, and no code between the v2 and v3 location touches vma ...

Looks like unrelated flukes, this happens occasionally. If you're paranoid
hit the retest button on patchwork to double-check.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

Re: [PATCH v3 1/2] drm: call drm_gem_object_funcs.mmap with fake offset

[Gerd Hoffmann]

On Thu, Dec 05, 2019 at 11:15:23PM +0100, Daniel Vetter wrote:
> On Thu, Nov 28, 2019 at 12:39:30PM +0100, Gerd Hoffmann wrote:
> > On Wed, Nov 27, 2019 at 10:25:22AM +0100, Gerd Hoffmann wrote:
> > > The fake offset is going to stay, so change the calling convention for
> > > drm_gem_object_funcs.mmap to include the fake offset.  Update all users
> > > accordingly.
> > > 
> > > Note that this reverts 83b8a6f242ea ("drm/gem: Fix mmap fake offset
> > > handling for drm_gem_object_funcs.mmap") and on top then adds the fake
> > > offset to  drm_gem_prime_mmap to make sure all paths leading to
> > > obj->funcs->mmap are consistent.
> > > 
> > > v3: move fake-offset tweak in drm_gem_prime_mmap() so we have this code
> > >     only once in the function (Rob Herring).
> > 
> > Now this series fails in Intel CI.  Can't see why though.  The
> > difference between v2 and v3 is just the place where vma->vm_pgoff gets
> > updated, and no code between the v2 and v3 location touches vma ...
> 
> Looks like unrelated flukes, this happens occasionally. If you're paranoid
> hit the retest button on patchwork to double-check.
> -Daniel

Guess you kicked CI?  Just got CI mails, now reporting success, without
doing anything.  So I'll go push v3 to misc-next.

cheers,
  Gerd

Re: [Intel-gfx] [PATCH v3 1/2] drm: call drm_gem_object_funcs.mmap with fake offset

[Daniel Vetter]

On Fri, Dec 6, 2019 at 11:07 AM Gerd Hoffmann <kraxel@redhat.com> wrote:
>
> On Thu, Dec 05, 2019 at 11:15:23PM +0100, Daniel Vetter wrote:
> > On Thu, Nov 28, 2019 at 12:39:30PM +0100, Gerd Hoffmann wrote:
> > > On Wed, Nov 27, 2019 at 10:25:22AM +0100, Gerd Hoffmann wrote:
> > > > The fake offset is going to stay, so change the calling convention for
> > > > drm_gem_object_funcs.mmap to include the fake offset.  Update all users
> > > > accordingly.
> > > >
> > > > Note that this reverts 83b8a6f242ea ("drm/gem: Fix mmap fake offset
> > > > handling for drm_gem_object_funcs.mmap") and on top then adds the fake
> > > > offset to  drm_gem_prime_mmap to make sure all paths leading to
> > > > obj->funcs->mmap are consistent.
> > > >
> > > > v3: move fake-offset tweak in drm_gem_prime_mmap() so we have this code
> > > >     only once in the function (Rob Herring).
> > >
> > > Now this series fails in Intel CI.  Can't see why though.  The
> > > difference between v2 and v3 is just the place where vma->vm_pgoff gets
> > > updated, and no code between the v2 and v3 location touches vma ...
> >
> > Looks like unrelated flukes, this happens occasionally. If you're paranoid
> > hit the retest button on patchwork to double-check.
> > -Daniel
>
> Guess you kicked CI?  Just got CI mails, now reporting success, without
> doing anything.  So I'll go push v3 to misc-next.

Yeah I kicked it, since iirc you need your patchwork account to be
treated with the re-run powers first. Might want to get those with a
quick ping on irc, it's useful.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch

Re: [PATCH v3 1/2] drm: call drm_gem_object_funcs.mmap with fake offset

[Gerd Hoffmann]

On Fri, Dec 06, 2019 at 11:07:24AM +0100, Gerd Hoffmann wrote:
> On Thu, Dec 05, 2019 at 11:15:23PM +0100, Daniel Vetter wrote:
> > Looks like unrelated flukes, this happens occasionally. If you're paranoid
> > hit the retest button on patchwork to double-check.
> > -Daniel
> 
> Guess you kicked CI?  Just got CI mails, now reporting success, without
> doing anything.  So I'll go push v3 to misc-next.

Oops, spoke too soon.  Next mail arrived.  Fi.CI.BAT works, but
Fi.CI.IGT still fails.

Where is the "test again" button?  Can I re-run the tests on v2?  Right
now I tend to commit v2 to have a fix committed, then go figure why v3
fails ...

cheers,
  Gerd

Re: [Intel-gfx] [PATCH v3 1/2] drm: call drm_gem_object_funcs.mmap with fake offset

[Daniel Vetter]

On Fri, Dec 6, 2019 at 11:22 AM Gerd Hoffmann <kraxel@redhat.com> wrote:
>
> On Fri, Dec 06, 2019 at 11:07:24AM +0100, Gerd Hoffmann wrote:
> > On Thu, Dec 05, 2019 at 11:15:23PM +0100, Daniel Vetter wrote:
> > > Looks like unrelated flukes, this happens occasionally. If you're paranoid
> > > hit the retest button on patchwork to double-check.
> > > -Daniel
> >
> > Guess you kicked CI?  Just got CI mails, now reporting success, without
> > doing anything.  So I'll go push v3 to misc-next.
>
> Oops, spoke too soon.  Next mail arrived.  Fi.CI.BAT works, but
> Fi.CI.IGT still fails.
>
> Where is the "test again" button?  Can I re-run the tests on v2?  Right
> now I tend to commit v2 to have a fix committed, then go figure why v3
> fails ...

Top of the mail you get from CI is the link to the patchwork series.
That contains all the same info like in the mail, plus the coveted
button. If failures look similar then yes I guess v3 is somehow
broken. But I've looked, looks like just 2x unrelated noise and you
being unlucky, so imo totally fine to push v3. I'll give CI folks a
heads-up (best done over irc usually).
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch

Re: [Intel-gfx] [PATCH v3 1/2] drm: call drm_gem_object_funcs.mmap with fake offset

[Gerd Hoffmann]

On Fri, Dec 06, 2019 at 12:10:15PM +0100, Daniel Vetter wrote:
> On Fri, Dec 6, 2019 at 11:22 AM Gerd Hoffmann <kraxel@redhat.com> wrote:
> >
> > > Guess you kicked CI?  Just got CI mails, now reporting success, without
> > > doing anything.  So I'll go push v3 to misc-next.
> >
> > Oops, spoke too soon.  Next mail arrived.  Fi.CI.BAT works, but
> > Fi.CI.IGT still fails.
> >
> > Where is the "test again" button?  Can I re-run the tests on v2?  Right
> > now I tend to commit v2 to have a fix committed, then go figure why v3
> > fails ...
> 
> Top of the mail you get from CI is the link to the patchwork series.
> That contains all the same info like in the mail, plus the coveted
> button. If failures look similar then yes I guess v3 is somehow
> broken. But I've looked, looks like just 2x unrelated noise and you
> being unlucky, so imo totally fine to push v3. I'll give CI folks a
> heads-up (best done over irc usually).

Ok.  Pushed now.

cheers,
  Gerd

[PATCH v3 2/2] drm: share address space for dma bufs

[Gerd Hoffmann]

Use the shared address space of the drm device (see drm_open() in
drm_file.c) for dma-bufs too.  That removes a difference betweem drm
device mmap vmas and dma-buf mmap vmas and fixes corner cases like
dropping ptes (using madvise(DONTNEED) for example) not working
properly.

Also remove amdgpu driver's private dmabuf update.  It is not needed
any more now that we are doing this for everybody.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c | 4 +---
 drivers/gpu/drm/drm_prime.c                 | 4 +++-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
index d5bcdfefbad6..586db4fb46bd 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
@@ -361,10 +361,8 @@ struct dma_buf *amdgpu_gem_prime_export(struct drm_gem_object *gobj,
 		return ERR_PTR(-EPERM);
 
 	buf = drm_gem_prime_export(gobj, flags);
-	if (!IS_ERR(buf)) {
-		buf->file->f_mapping = gobj->dev->anon_inode->i_mapping;
+	if (!IS_ERR(buf))
 		buf->ops = &amdgpu_dmabuf_ops;
-	}
 
 	return buf;
 }
diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index a0f929c7117b..86d9b0e45c8c 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -240,6 +240,7 @@ void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv)
 struct dma_buf *drm_gem_dmabuf_export(struct drm_device *dev,
 				      struct dma_buf_export_info *exp_info)
 {
+	struct drm_gem_object *obj = exp_info->priv;
 	struct dma_buf *dma_buf;
 
 	dma_buf = dma_buf_export(exp_info);
@@ -247,7 +248,8 @@ struct dma_buf *drm_gem_dmabuf_export(struct drm_device *dev,
 		return dma_buf;
 
 	drm_dev_get(dev);
-	drm_gem_object_get(exp_info->priv);
+	drm_gem_object_get(obj);
+	dma_buf->file->f_mapping = obj->dev->anon_inode->i_mapping;
 
 	return dma_buf;
 }
-- 
2.18.1