Hi Jani, Sorry for late reply.
On 2012? 09? 27? 22:43, Jani Nikula wrote: > On Thu, 27 Sep 2012, Seung-Woo Kim <sw0312.kim at samsung.com> 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 think it was possible to re-use a handle imported_buf list which is already deleted, and it was fixed after Dave's commit "drm/prime: add exported buffers to current fprivs imported buffer list (v2)". > > I haven't looked into why this happens at all, so I'm just sharing this > in case you guys find it helpful. If you still have same assert, I think it will be very helpful to let me know exactly where the assert occurs from 5 check_bo() in test application in your link. Thanks and Best Regards, - Seung-Woo Kim > > 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 at samsung.com> >> Signed-off-by: Kyungmin.park <kyungmin.park at samsung.com> >> Cc: Inki Dae <inki.dae at samsung.com> >> Cc: Daniel Vetter <daniel.vetter at ffwll.ch> >> Cc: Rob Clark <rob.clark at linaro.org> >> Cc: Alex Deucher <alexander.deucher at amd.com> >> --- >> 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 at lists.freedesktop.org >> http://lists.freedesktop.org/mailman/listinfo/dri-devel > -- Seung-Woo Kim Samsung Software R&D Center --
