From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay7-d.mail.gandi.net (relay7-d.mail.gandi.net [217.70.183.200]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 51A25280A3D for ; Tue, 4 Mar 2025 15:35:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.200 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741102556; cv=none; b=Qn68V8MdbSU5zr/sJSNE7IXSMzdTYbfMYKp4QmhiqXoLUGkeReM8mbJbcIM1o2WZZIoFfXb2dfQn9ut4JiYtd1CYlQKCHJf+zVrGnvnnjfawy7kFWH9RsYBuc0WfF3tWLXS8s8aU6GC414Im0NKj3lUNQ9+XAsghMdTaeidkqrY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741102556; c=relaxed/simple; bh=G2+xLwRGuGp4daeK5cDXWsbIxYkRLFzqcIHTH2cqLuc=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=iO2o0+r9vDKIYPyJuczyVXRLVxsChwz1lsXna8nO19xKrH7KKbJeMzjNHW6nhJH/XOVdYs+zWO1StZiMDFFK51rNYY9HkY0Y4KClDwCDgGsufiQRRXYQANW+7NLx1bhj0FDMDZbTVH6Rl1VS+4Ln/YZV2b9PNFCRmtMUbiBn6O0= ARC-Authentication-Results:i=1; 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bh=v5eDZmBWe7K26EFzulkfQB+TGvAIpuPH7bySSym5Amk=; b=Uq/vYyDCA7A1KK9Ur1ueQxbrt//Qng+F1vDlaoG5TrVAafU/yGEHpP92EsEKxQL+ft3tdE W22KoHiNvla0fTenbxWzZNl/dlaUfSavpiF3FHwGeCfJXBHgPiWB9zHeLcht6WMRP//OVq 1YtYM0ol5bwYaetACS+fMCWwieo5/wLwjWCObRTVCFTjcMef9AaVXqmQMmER/BMrHn/bYg DdZrboSr+kkloD8tNzg1WZQ/FTdwq5QQyMDknpxmRAaFebPjY3D/veRLAw6i922rMUEI3C 7db2YcCLEcFPmioOwGv/URDXnGLod4Am//mlXH/u+rAEdlkm0K2hdX8o1Mwsjw== Message-ID: Date: Tue, 4 Mar 2025 16:35:50 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 03/16] drm/vkms: Allow to configure multiple planes via configfs To: =?UTF-8?B?Sm9zw6kgRXhww7NzaXRv?= Cc: hamohammed.sa@gmail.com, simona@ffwll.ch, melissa.srw@gmail.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org References: <20250225175936.7223-1-jose.exposito89@gmail.com> <20250225175936.7223-4-jose.exposito89@gmail.com> <52bc3f15-28da-4b40-917f-981f1f10d9b8@bootlin.com> Content-Language: en-US From: Louis Chauvet Autocrypt: addr=louis.chauvet@bootlin.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-GND-State: clean X-GND-Score: -100 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgddutddvgeduucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuifetpfffkfdpucggtfgfnhhsuhgsshgtrhhisggvnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefkffggfgfuvfevfhfhjggtgfesthekredttddvjeenucfhrhhomhepnfhouhhishcuvehhrghuvhgvthcuoehlohhuihhsrdgthhgruhhvvghtsegsohhothhlihhnrdgtohhmqeenucggtffrrghtthgvrhhnpeffveejueevtdfhffekvdelfefhvedtgeduudfhvedtvdejveejhfeukeehhfdvueenucffohhmrghinhepghhithhhuhgsrdgtohhmnecukfhppeeltddrkeelrdduieefrdduvdejnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepledtrdekledrudeifedruddvjedphhgvlhhopegludelvddrudeikedrtddrvddtngdpmhgrihhlfhhrohhmpehlohhuihhsrdgthhgruhhvvghtsegsohhothhlihhnrdgtohhmpdhnsggprhgtphhtthhopedutddprhgtphhtthhopehjohhsvgdrvgigphhoshhithhokeelsehgmhgrihhlrdgtohhmpdhrtghpthhtohephhgrmhhohhgrmhhmvggurdhsrgesghhmrghilhdrtghomhdprhgtphhtthhopehsihhmohhnrgesfhhffihllhdrtghhpdhrtghpthhtohepmhgvlhhishhsrgdrshhrfiesghhmrghilhdrtghomhdprhgtphhtthhopehmr ggrrhhtvghnrdhlrghnkhhhohhrshhtsehlihhnuhigrdhinhhtvghlrdgtohhmpdhrtghpthhtohepmhhrihhprghrugeskhgvrhhnvghlrdhorhhgpdhrtghpthhtohepthiiihhmmhgvrhhmrghnnhesshhushgvrdguvgdprhgtphhtthhopegrihhrlhhivggusehgmhgrihhlrdgtohhm X-GND-Sasl: louis.chauvet@bootlin.com Le 04/03/2025 à 15:54, José Expósito a écrit : > Hi Louis, > > On Mon, Mar 03, 2025 at 11:34:50AM +0100, Louis Chauvet wrote: >> >> >> Le 03/03/2025 à 09:50, José Expósito a écrit : >>> Hi Louis, >>> >>> On Fri, Feb 28, 2025 at 03:43:25PM +0100, Louis Chauvet wrote: >>>> >>>> >>>> Le 25/02/2025 à 18:59, José Expósito a écrit : >>>>> Create a default subgroup at /config/vkms/planes to allow to create as >>>>> many planes as required. >>>>> >>>>> Reviewed-by: Louis Chauvet >>>>> Co-developed-by: Louis Chauvet >>>>> Signed-off-by: Louis Chauvet >>>>> Signed-off-by: José Expósito >>>>> [...] >>>>> diff --git a/drivers/gpu/drm/vkms/vkms_configfs.c b/drivers/gpu/drm/vkms/vkms_configfs.c >>>>> index 92512d52ddae..4f9d3341e6c0 100644 >>>>> --- a/drivers/gpu/drm/vkms/vkms_configfs.c >>>>> +++ b/drivers/gpu/drm/vkms/vkms_configfs.c >>>>> [...] >>>>> +static void plane_release(struct config_item *item) >>>>> +{ >>>>> + struct vkms_configfs_plane *plane; >>>>> + struct mutex *lock; >>>>> + >>>>> + plane = plane_item_to_vkms_configfs_plane(item); >>>>> + lock = &plane->dev->lock; >>>>> + >>>>> + guard(mutex)(lock); >>>>> + vkms_config_destroy_plane(plane->config); >>>>> + kfree(plane); >>>>> +} >>>> >>>> I just found a flaw in our work: there is currently no way to forbid the >>>> deletion of item/symlinks... >>>> >>>> If you do: >>>> >>>> modprobe vkms >>>> cd /sys/kernel/config/vkms/ >>>> mkdir DEV >>>> mkdir DEV/connectors/CON >>>> mkdir DEV/planes/PLA >>>> mkdir DEV/crtcs/CRT >>>> mkdir DEV/encoders/ENC >>>> ln -s DEV/crtcs/CRT DEV/planes/PLA/possible_crtcs/ >>>> ln -s DEV/crtcs/CRT DEV/encoders/ENC/possible_crtcs >>>> ln -s DEV/encoders/ENC DEV/connectors/CON/possible_encoders >>>> echo 1 > DEV/planes/PLA/type >>>> tree >>>> echo 1 > DEV/enabled >>>> modetest -M vkms >>>> => everything fine >>>> >>>> rm DEV/connectors/CON/possible_encoders/ENC >>>> rmdir DEV/connectors/CON >>>> modetest -M vkms >>>> => BUG: KASAN: slab-use-after-free > > I'm trying to reproduce this issue, but those commands don't show any BUG > in dmesg. This is my Kasan .config: > > CONFIG_HAVE_ARCH_KASAN=y > CONFIG_HAVE_ARCH_KASAN_VMALLOC=y > CONFIG_CC_HAS_KASAN_GENERIC=y > CONFIG_CC_HAS_KASAN_SW_TAGS=y > CONFIG_CC_HAS_WORKING_NOSANITIZE_ADDRESS=y > CONFIG_KASAN=y > CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX=y > CONFIG_KASAN_GENERIC=y > # CONFIG_KASAN_OUTLINE is not set > CONFIG_KASAN_INLINE=y > CONFIG_KASAN_STACK=y > CONFIG_KASAN_VMALLOC=y > # CONFIG_KASAN_KUNIT_TEST is not set > CONFIG_KASAN_EXTRA_INFO=y > > I tryed to delete even more items: > > root@kernel-dev:/sys/kernel/config/vkms# tree > . > └── DEV > ├── connectors > ├── crtcs > ├── enabled > ├── encoders > └── planes > > root@kernel-dev:/sys/kernel/config/vkms# cat DEV/enabled > 1 > > And I still don't see any errors. Is it possible that we are running different > branches? Asking because of the failing IGT tests you reported. There seems to > be a difference in our code or setup that is creating these differences. I just re-applied your last vkms-config version and this series on top of drm-misc-next. See [1] for the exact commits. Argg sorry, I just noticed something: you need to disable the default vkms device (I had this option in my kernel command line...), otherwise modetest only use the first vkms gpu... I will check again the igt tests, but I don't think this is the same issue (it should not use the default device to test) So, with [1] and the defconfig below, I have this: 1 modprobe vkms create_default_dev=0 2 cd /sys/kernel/config/vkms/ 3 mkdir DEV 4 mkdir DEV/connectors/CON 5 mkdir DEV/planes/PLA 6 mkdir DEV/crtcs/CRT 7 mkdir DEV/encoders/ENC 8 ln -s DEV/crtcs/CRT DEV/planes/PLA/possible_crtcs/ 9 ln -s DEV/crtcs/CRT DEV/encoders/ENC/possible_crtcs 10 ln -s DEV/encoders/ENC DEV/connectors/CON/possible_encoders 11 echo 1 > DEV/planes/PLA/type 12 tree 13 echo 1 > DEV/enabled 14 modetest -M vkms 15 rm DEV/connectors/CON/possible_encoders/ENC 16 rmdir DEV/connectors/CON 17 modetest -M vkms KASAN: slab-use-after-free [1]:https://github.com/Fomys/linux/tree/20250225175936.7223-1-jose.exposito89%40gmail.com ===== defconfig ===== CONFIG_SYSVIPC=y CONFIG_CGROUPS=y CONFIG_KALLSYMS_ALL=y CONFIG_SMP=y CONFIG_HYPERVISOR_GUEST=y CONFIG_PARAVIRT=y # CONFIG_VIRTUALIZATION is not set CONFIG_JUMP_LABEL=y CONFIG_MODULES=y CONFIG_MODULE_UNLOAD=y CONFIG_NET=y CONFIG_PACKET=y # CONFIG_WIRELESS is not set CONFIG_NET_9P=y CONFIG_NET_9P_VIRTIO=y CONFIG_PCI=y CONFIG_DEVTMPFS=y CONFIG_DEVTMPFS_MOUNT=y CONFIG_VIRTIO_BLK=y # CONFIG_INTEL_MEI is not set CONFIG_NETDEVICES=y CONFIG_VIRTIO_NET=y # CONFIG_ETHERNET is not set # CONFIG_WLAN is not set CONFIG_INPUT_EVDEV=y CONFIG_SERIAL_8250=y CONFIG_SERIAL_8250_CONSOLE=y CONFIG_VIRTIO_CONSOLE=y CONFIG_HW_RANDOM_VIRTIO=m CONFIG_PTP_1588_CLOCK=y # CONFIG_HWMON is not set CONFIG_THERMAL_GOV_USER_SPACE=y CONFIG_DRM=y CONFIG_DRM_KUNIT_TEST=m CONFIG_DRM_VKMS=m CONFIG_DRM_VKMS_KUNIT_TEST=m # CONFIG_USB_SUPPORT is not set CONFIG_VIRTIO_PCI=y CONFIG_VIRTIO_BALLOON=y CONFIG_VIRTIO_INPUT=y CONFIG_VIRTIO_MMIO=y CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES=y # CONFIG_SURFACE_PLATFORMS is not set CONFIG_EXT4_FS=y CONFIG_FUSE_FS=y CONFIG_VIRTIO_FS=y CONFIG_OVERLAY_FS=y CONFIG_TMPFS=y CONFIG_TMPFS_POSIX_ACL=y CONFIG_CONFIGFS_FS=y CONFIG_9P_FS=y CONFIG_CRYPTO=y CONFIG_CRYPTO_CRC32C=y CONFIG_DYNAMIC_DEBUG=y CONFIG_DEBUG_KERNEL=y CONFIG_DEBUG_INFO_DWARF5=y CONFIG_MAGIC_SYSRQ=y CONFIG_DEBUG_FS=y CONFIG_DEBUG_PAGEALLOC=y CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT=y CONFIG_PAGE_POISONING=y CONFIG_DEBUG_OBJECTS=y CONFIG_DEBUG_OBJECTS_RCU_HEAD=y CONFIG_SCHED_STACK_END_CHECK=y CONFIG_KASAN=y CONFIG_KASAN_VMALLOC=y CONFIG_KASAN_EXTRA_INFO=y CONFIG_KFENCE=y # CONFIG_FTRACE is not set CONFIG_UNWINDER_FRAME_POINTER=y CONFIG_KUNIT=y CONFIG_TEST_DYNAMIC_DEBUG=m