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Mon, 9 Mar 2020 09:40:56 +0900 (KST) Received: from [10.113.221.211] (unknown [10.113.221.211]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20200309004056epsmtip22b2048432a3af7077f66fa5ae195b41e~6e_gqbYL42713127131epsmtip2d; Mon, 9 Mar 2020 00:40:56 +0000 (GMT) Subject: Re: [PATCH] drm/exynos: Fix memory leak and release IOMMU mapping structures To: Lukasz Luba , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org Cc: jy0922.shim@samsung.com, sw0312.kim@samsung.com, kyungmin.park@samsung.com, airlied@linux.ie, daniel@ffwll.ch, kgene@kernel.org, krzk@kernel.org, b.zolnierkie@samsung.com, a.hajda@samsung.com, Dietmar.Eggemann@arm.com From: Inki Dae Message-ID: Date: Mon, 9 Mar 2020 09:45:24 +0900 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20200304220022.8003-1-lukasz.luba@arm.com> Content-Language: en-US Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA01Tf0wTZxjOd3e9HsTOWxF50yUCly2mJNiepfrpKNkyt5yZ2UiWbW4m1Ev5 AoT22vQKG+oyhMUodoMOY7rCNk0YQ8KmVAUlMBQTGRp+zZ9xU1A0E5mSaGAubba1PZfx3/O8 3/PmfZ73+z6ONv7GmrgKJUD8iuwW2HSm55zZmh9uIiXWjvtmfOPHMR3+fGyEwt3hozr8T0+I xveaTtL48sI8i+/fmmRw48wcjcfHj+nxaN0fehyduarDl/paWRwe/4nCh+s+0+Nw8yz7ynKp 65suJA0sHmKkaOc+VupdnNZJU/uHKel426fSFyc6kfQkuqqY+7CysJzIpcSfQxSXt7RCKXMI b77jfM1pX2cV88UNeL2Qo8ge4hA2bSnOf6PCnTAv5FTL7qpEqVhWVcFSVOj3VgVITrlXDTgE 4it1+zb41qiyR61Syta4vJ6NotW61p4Qbq8snwvW074+8eP4dJ2uFv26ugFxHPAFcHwwuwGl c0b+FIL2eJzWyGMEwSsxSiOLCOb7DqAGlJbq6J6L6bWDAQRHgpdZjcwjODbSRiVVGfz7cObW n6mDFXw3gutdp1GS0PwMgn3Rg0xSxfIvQahjik1iA18EU8PfpzDDvwgPwhN00mEmvxUuLsia 5HkY+eoukyyn8RjafxGTZZrPght3v6U0nA31J1tSGYDv0cOFnqeUZnsTBEPtrIYz4MHwCb2G TTDbuEevNdQjCIUvUhrZi+DmzDVGU9lg8LtmKjmZ5s1wtM+ilXPhdOxrpE1+Dh4tBHXaVg2w d49RkwhwfvL6s9UBTLSFnnmQYHI2zjSh3MiSaJEleSJL8kT+H3wIMZ1oJfGpnjKiir6Cpdcd RamXnYdPof6xLUOI55CwzDCdTUqMOrlarfEMIeBoYYVhd56rxGgolWt2EL/X6a9yE3UI2ROL D9GmTJc38U+UgFO0r7XZbLhAXGcXRSHLcPsDc4mRL5MDpJIQH/H/10dxaaZa9HLwrKu/d3mx bZv3yO+R/R07c2OWuPOF1idPW5TRhzXNm69lZGWeO3vhbcdul6/3LUuWeDC4K65O+He4Y04O Br9c3Hj49VhL/MzqmLly9Pyl9Q/vCNtfze7+ZFg80Fpk/msVpFf/YNm22fSectORW2ud+3nn u393NO4q7B+4+lF0a6HAqOWymEf7Vflf7AsHAu8DAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrFIsWRmVeSWpSXmKPExsWy7bCSvO6MCalxBrPn8lncWneO1aL33Ekm i40z1rNa/N82kdni6YStzBZXvr5ns3hx7yKLRf/j18wW589vYLc42/SG3WLT42usFpd3zWGz mHF+H5PFwqYWdosZk1+yOfB7rJm3htFj77cFLB6bVnWyeWz/9oDV4373cSaPzUvqPfq2rGL0 +LxJLoAjissmJTUnsyy1SN8ugSvjdU8zc8Euw4o/D5pYGxhvq3cxcnJICJhIbHz9m72LkYtD SGA3o8SzU7eAHA6ghITElq0cEKawxOHDxRAlbxklrj9rYgHpFRYIlzhw7zsbSEJEYCOjxPzz K1hAHGaBx4wSzVvOMkO0dDNKrJnRzQbSwiagKjFxxX0wm1fATuL+8eVgNouAisSrGReYQWxR gQiJ59tvMELUCEqcnPmEBeQMTgELiWWXDEHCzALqEn/mXWKGsMUlbj2ZzwRhy0s0b53NPIFR aBaS7llIWmYhaZmFpGUBI8sqRsnUguLc9NxiwwLDvNRyveLE3OLSvHS95PzcTYzgGNXS3MF4 eUn8IUYBDkYlHt4H8qlxQqyJZcWVuYcYJTiYlUR4G7WS44R4UxIrq1KL8uOLSnNSiw8xSnOw KInzPs07FikkkJ5YkpqdmlqQWgSTZeLglGpg1FgpPOPbvr+LGniqVa8+mGpvN02l2ezbqtdy /A98P8WXyjsE7DxgXPWXgaOnNzrB5+bhbd+qc/ol2XWCf71sf5LKOF+8229fSiKHxSwTTa20 f7ul2vVnnGwX/25/LNU5tYG3ff35x3ufJdvqXos5Xbhc73mFhcBW0ZSn3ZkfWU/xnzdpn/tT iaU4I9FQi7moOBEA86vmLM0CAAA= X-CMS-MailID: 20200309004056epcas1p264978098770f6a81ea6d7a9c1c1df256 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20200304220104epcas1p2d65f8ab31df6aa5373787b695b14f8ff References: <20200304220022.8003-1-lukasz.luba@arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Lukasz, 20. 3. 5. 오전 7:00에 Lukasz Luba 이(가) 쓴 글: > There is a memory leak which left some objects not freed. The reference > counter of mapping: 'mapping->kref' was 2 when calling > arm_iommu_detach_device(), so the release_iommu_mapping() won't be called. > Since the old mapping structure is not going to be used any more (because > it is detached and new one attached), call arm_iommu_release_mapping() > to trigger cleanup. > > Found using kmemleak detector, the output: > > unreferenced object 0xc2137640 (size 64): > comm "swapper/0", pid 1, jiffies 4294937900 (age 3127.400s) > hex dump (first 32 bytes): > 50 a3 14 c2 80 a2 14 c2 01 00 00 00 20 00 00 00 P........... ... > 00 10 00 00 00 80 00 00 00 00 00 00 00 00 00 00 ................ > backtrace: > [<3acd268d>] arch_setup_dma_ops+0x4c/0x104 > [<9f7d2cce>] of_dma_configure+0x19c/0x3a4 > [] really_probe+0xb0/0x47c > [<4f510e4f>] driver_probe_device+0x78/0x1c4 > [<7481a0cf>] device_driver_attach+0x58/0x60 > [<0ff8f5c1>] __driver_attach+0xb8/0x158 > [<86006144>] bus_for_each_dev+0x74/0xb4 > [<10159dca>] bus_add_driver+0x1c0/0x200 > [<8a265265>] driver_register+0x74/0x108 > [] exynos_drm_init+0xb0/0x134 > [] do_one_initcall+0x90/0x458 > [<6da35917>] kernel_init_freeable+0x188/0x200 > [] kernel_init+0x8/0x110 > [<1f3cddf9>] ret_from_fork+0x14/0x20 > [<8cd12507>] 0x0 > unreferenced object 0xc214a280 (size 128): > comm "swapper/0", pid 1, jiffies 4294937900 (age 3127.400s) > hex dump (first 32 bytes): > 00 a0 ec ed 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > backtrace: > [<3acd268d>] arch_setup_dma_ops+0x4c/0x104 > [<9f7d2cce>] of_dma_configure+0x19c/0x3a4 > [] really_probe+0xb0/0x47c > [<4f510e4f>] driver_probe_device+0x78/0x1c4 > [<7481a0cf>] device_driver_attach+0x58/0x60 > [<0ff8f5c1>] __driver_attach+0xb8/0x158 > [<86006144>] bus_for_each_dev+0x74/0xb4 > [<10159dca>] bus_add_driver+0x1c0/0x200 > [<8a265265>] driver_register+0x74/0x108 > [] exynos_drm_init+0xb0/0x134 > [] do_one_initcall+0x90/0x458 > [<6da35917>] kernel_init_freeable+0x188/0x200 > [] kernel_init+0x8/0x110 > [<1f3cddf9>] ret_from_fork+0x14/0x20 > [<8cd12507>] 0x0 > unreferenced object 0xedeca000 (size 4096): > comm "swapper/0", pid 1, jiffies 4294937900 (age 3127.400s) > hex dump (first 32 bytes): > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > backtrace: > [<3acd268d>] arch_setup_dma_ops+0x4c/0x104 > [<9f7d2cce>] of_dma_configure+0x19c/0x3a4 > [] really_probe+0xb0/0x47c > [<4f510e4f>] driver_probe_device+0x78/0x1c4 > [<7481a0cf>] device_driver_attach+0x58/0x60 > [<0ff8f5c1>] __driver_attach+0xb8/0x158 > [<86006144>] bus_for_each_dev+0x74/0xb4 > [<10159dca>] bus_add_driver+0x1c0/0x200 > [<8a265265>] driver_register+0x74/0x108 > [] exynos_drm_init+0xb0/0x134 > [] do_one_initcall+0x90/0x458 > [<6da35917>] kernel_init_freeable+0x188/0x200 > [] kernel_init+0x8/0x110 > [<1f3cddf9>] ret_from_fork+0x14/0x20 > [<8cd12507>] 0x0 > unreferenced object 0xc214a300 (size 128): > comm "swapper/0", pid 1, jiffies 4294937900 (age 3127.400s) > hex dump (first 32 bytes): > 00 a3 14 c2 00 a3 14 c2 00 40 18 c2 00 80 18 c2 .........@...... > 02 00 02 00 ad 4e ad de ff ff ff ff ff ff ff ff .....N.......... > backtrace: > [<08cbd8bc>] iommu_domain_alloc+0x24/0x50 > [] arm_iommu_create_mapping+0xe4/0x134 > [<3acd268d>] arch_setup_dma_ops+0x4c/0x104 > [<9f7d2cce>] of_dma_configure+0x19c/0x3a4 > [] really_probe+0xb0/0x47c > [<4f510e4f>] driver_probe_device+0x78/0x1c4 > [<7481a0cf>] device_driver_attach+0x58/0x60 > [<0ff8f5c1>] __driver_attach+0xb8/0x158 > [<86006144>] bus_for_each_dev+0x74/0xb4 > [<10159dca>] bus_add_driver+0x1c0/0x200 > [<8a265265>] driver_register+0x74/0x108 > [] exynos_drm_init+0xb0/0x134 > [] do_one_initcall+0x90/0x458 > [<6da35917>] kernel_init_freeable+0x188/0x200 > [] kernel_init+0x8/0x110 > [<1f3cddf9>] ret_from_fork+0x14/0x20 > > Signed-off-by: Lukasz Luba > --- > > Hi all, > > I have discovered this issue on OdroidXU4 while running some stress tests > for upcoming Energy Model. To reproduce it, kernel must be compiled with > DEBUG_KMEMLEAK. When the boot has finished, type: > # echo scan > /sys/kernel/debug/kmemleak > # cat /sys/kernel/debug/kmemleak > You should expect similar output to the one from the commit message. > > I don't know if it should go via stable tree as well. I can resend with CC > stable, if there is a need. Thanks for fixup. BTW, as you commented on Marek's patch thread, with Marek's patch the memory leak will be solved. Do you want Marek to rework his patch on top of your patch or are you ok me to pick up only Marek's one? Marek's patch is conflicted with your one. Thanks, Inki Dae > > Regards, > Lukasz Luba > > drivers/gpu/drm/exynos/exynos_drm_dma.c | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/exynos/exynos_drm_dma.c b/drivers/gpu/drm/exynos/exynos_drm_dma.c > index 9ebc02768847..45f209ec107f 100644 > --- a/drivers/gpu/drm/exynos/exynos_drm_dma.c > +++ b/drivers/gpu/drm/exynos/exynos_drm_dma.c > @@ -74,8 +74,13 @@ static int drm_iommu_attach_device(struct drm_device *drm_dev, > return ret; > > if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)) { > - if (to_dma_iommu_mapping(subdrv_dev)) > + struct dma_iommu_mapping *mapping = > + to_dma_iommu_mapping(subdrv_dev); > + > + if (mapping) { > arm_iommu_detach_device(subdrv_dev); > + arm_iommu_release_mapping(mapping); > + } > > ret = arm_iommu_attach_device(subdrv_dev, priv->mapping); > } else if (IS_ENABLED(CONFIG_IOMMU_DMA)) { > From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on 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(GMT) Subject: Re: [PATCH] drm/exynos: Fix memory leak and release IOMMU mapping structures To: Lukasz Luba , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org From: Inki Dae Message-ID: Date: Mon, 9 Mar 2020 09:45:24 +0900 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20200304220022.8003-1-lukasz.luba@arm.com> Content-Language: en-US X-Brightmail-Tracker: H4sIAAAAAAAAA01Tf0wTZxjOd3e9HsTOWxF50yUCly2mJNiepfrpKNkyt5yZ2UiWbW4m1Ev5 AoT22vQKG+oyhMUodoMOY7rCNk0YQ8KmVAUlMBQTGRp+zZ9xU1A0E5mSaGAubba1PZfx3/O8 3/PmfZ73+z6ONv7GmrgKJUD8iuwW2HSm55zZmh9uIiXWjvtmfOPHMR3+fGyEwt3hozr8T0+I xveaTtL48sI8i+/fmmRw48wcjcfHj+nxaN0fehyduarDl/paWRwe/4nCh+s+0+Nw8yz7ynKp 65suJA0sHmKkaOc+VupdnNZJU/uHKel426fSFyc6kfQkuqqY+7CysJzIpcSfQxSXt7RCKXMI b77jfM1pX2cV88UNeL2Qo8ge4hA2bSnOf6PCnTAv5FTL7qpEqVhWVcFSVOj3VgVITrlXDTgE 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X-AuditID: b6c32a38-23fff7000001bb93-71-5e659098584f Received: from epsmtip2.samsung.com ( [182.195.34.31]) by epsmgms1p1new.samsung.com (Symantec Messaging Gateway) with SMTP id 5D.FD.10238.890956E5; Mon, 9 Mar 2020 09:40:56 +0900 (KST) Received: from [10.113.221.211] (unknown [10.113.221.211]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20200309004056epsmtip22b2048432a3af7077f66fa5ae195b41e~6e_gqbYL42713127131epsmtip2d; Mon, 9 Mar 2020 00:40:56 +0000 (GMT) Subject: Re: [PATCH] drm/exynos: Fix memory leak and release IOMMU mapping structures To: Lukasz Luba , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org From: Inki Dae Message-ID: Date: Mon, 9 Mar 2020 09:45:24 +0900 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20200304220022.8003-1-lukasz.luba@arm.com> Content-Language: en-US X-Brightmail-Tracker: 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