On Thu, 27 Sep 2012, Seung-Woo Kim sw0312.kim@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 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_i...
Signed-off-by: Seung-Woo Kim sw0312.kim@samsung.com Signed-off-by: Kyungmin.park kyungmin.park@samsung.com Cc: Inki Dae inki.dae@samsung.com Cc: Daniel Vetter daniel.vetter@ffwll.ch Cc: Rob Clark rob.clark@linaro.org Cc: Alex Deucher alexander.deucher@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
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