On Thu, 27 Sep 2012, Seung-Woo Kim <sw0312.kim@xxxxxxxxxxx> wrote: > Increasing ref counts of both dma-buf and gem for imported dma-buf come from gem > makes memory leak. release function of dma-buf cannot be called because f_count > of dma-buf increased by importing gem and gem ref count cannot be decrease > because of exported dma-buf. > > So I add dma_buf_put() for imported gem come from its own gem into each drivers > having prime_import and prime_export capabilities. With this, only gem ref > count is increased if importing gem exported from gem of same driver. There's a reference leak bug [1] related to prime self import found by intel-gpu-tools tests. Without much thinking, I just applied this patch to see if it makes a difference. Instead, it now fails with: prime_self_import: prime_self_import.c:61: check_bo: Assertion `ptr1' failed. The assert is at [2]. I haven't looked into why this happens at all, so I'm just sharing this in case you guys find it helpful. BR, Jani. [1] https://bugs.freedesktop.org/show_bug.cgi?id=54111 [2] http://cgit.freedesktop.org/xorg/app/intel-gpu-tools/tree/tests/prime_self_import.c#n61 > > Signed-off-by: Seung-Woo Kim <sw0312.kim@xxxxxxxxxxx> > Signed-off-by: Kyungmin.park <kyungmin.park@xxxxxxxxxxx> > Cc: Inki Dae <inki.dae@xxxxxxxxxxx> > Cc: Daniel Vetter <daniel.vetter@xxxxxxxx> > Cc: Rob Clark <rob.clark@xxxxxxxxxx> > Cc: Alex Deucher <alexander.deucher@xxxxxxx> > --- > drivers/gpu/drm/exynos/exynos_drm_dmabuf.c | 5 +++++ > drivers/gpu/drm/i915/i915_gem_dmabuf.c | 5 +++++ > drivers/gpu/drm/nouveau/nouveau_prime.c | 1 + > drivers/gpu/drm/radeon/radeon_prime.c | 1 + > drivers/staging/omapdrm/omap_gem_dmabuf.c | 5 +++++ > 5 files changed, 17 insertions(+), 0 deletions(-) > > diff --git a/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c b/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c > index ae13feb..b0897c9 100644 > --- a/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c > +++ b/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c > @@ -211,7 +211,12 @@ struct drm_gem_object *exynos_dmabuf_prime_import(struct drm_device *drm_dev, > > /* is it from our device? */ > if (obj->dev == drm_dev) { > + /* > + * Importing dmabuf exported from out own gem increases > + * refcount on gem itself instead of f_count of dmabuf. > + */ > drm_gem_object_reference(obj); > + dma_buf_put(dma_buf); > return obj; > } > } > diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/i915_gem_dmabuf.c > index aa308e1..32e6287 100644 > --- a/drivers/gpu/drm/i915/i915_gem_dmabuf.c > +++ b/drivers/gpu/drm/i915/i915_gem_dmabuf.c > @@ -188,7 +188,12 @@ struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev, > obj = dma_buf->priv; > /* is it from our device? */ > if (obj->base.dev == dev) { > + /* > + * Importing dmabuf exported from out own gem increases > + * refcount on gem itself instead of f_count of dmabuf. > + */ > drm_gem_object_reference(&obj->base); > + dma_buf_put(dma_buf); > return &obj->base; > } > } > diff --git a/drivers/gpu/drm/nouveau/nouveau_prime.c b/drivers/gpu/drm/nouveau/nouveau_prime.c > index a25cf2c..bb653c6 100644 > --- a/drivers/gpu/drm/nouveau/nouveau_prime.c > +++ b/drivers/gpu/drm/nouveau/nouveau_prime.c > @@ -199,6 +199,7 @@ struct drm_gem_object *nouveau_gem_prime_import(struct drm_device *dev, > if (nvbo->gem) { > if (nvbo->gem->dev == dev) { > drm_gem_object_reference(nvbo->gem); > + dma_buf_put(dma_buf); > return nvbo->gem; > } > } > diff --git a/drivers/gpu/drm/radeon/radeon_prime.c b/drivers/gpu/drm/radeon/radeon_prime.c > index 6bef46a..d344a3be 100644 > --- a/drivers/gpu/drm/radeon/radeon_prime.c > +++ b/drivers/gpu/drm/radeon/radeon_prime.c > @@ -195,6 +195,7 @@ struct drm_gem_object *radeon_gem_prime_import(struct drm_device *dev, > bo = dma_buf->priv; > if (bo->gem_base.dev == dev) { > drm_gem_object_reference(&bo->gem_base); > + dma_buf_put(dma_buf); > return &bo->gem_base; > } > } > diff --git a/drivers/staging/omapdrm/omap_gem_dmabuf.c b/drivers/staging/omapdrm/omap_gem_dmabuf.c > index 42728e0..5b50eb6 100644 > --- a/drivers/staging/omapdrm/omap_gem_dmabuf.c > +++ b/drivers/staging/omapdrm/omap_gem_dmabuf.c > @@ -207,7 +207,12 @@ struct drm_gem_object * omap_gem_prime_import(struct drm_device *dev, > obj = buffer->priv; > /* is it from our device? */ > if (obj->dev == dev) { > + /* > + * Importing dmabuf exported from out own gem increases > + * refcount on gem itself instead of f_count of dmabuf. > + */ > drm_gem_object_reference(obj); > + dma_buf_put(buffer); > return obj; > } > } > -- > 1.7.4.1 > > _______________________________________________ > dri-devel mailing list > dri-devel@xxxxxxxxxxxxxxxxxxxxx > http://lists.freedesktop.org/mailman/listinfo/dri-devel _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
