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Wed, 18 Jun 2025 16:25:58 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 3sF3JpboUmgOJQAAD6G6ig (envelope-from ); Wed, 18 Jun 2025 16:25:58 +0000 Message-ID: <17d14458-a035-4793-8f19-38f4405e02a3@suse.de> Date: Wed, 18 Jun 2025 18:25:58 +0200 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: [report] DMA-API: platform vgem: mapping sg segment longer than device claims to support [len=1048576] [max=65536] To: Zenghui Yu , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Cc: airlied@gmail.com, simona@ffwll.ch, maarten.lankhorst@linux.intel.com, mripard@kernel.org References: <6d22bce3-4533-4cfa-96ba-64352b715741@linux.dev> Content-Language: en-US From: Thomas Zimmermann Autocrypt: addr=tzimmermann@suse.de; keydata= xsBNBFs50uABCADEHPidWt974CaxBVbrIBwqcq/WURinJ3+2WlIrKWspiP83vfZKaXhFYsdg XH47fDVbPPj+d6tQrw5lPQCyqjwrCPYnq3WlIBnGPJ4/jreTL6V+qfKRDlGLWFjZcsrPJGE0 BeB5BbqP5erN1qylK9i3gPoQjXGhpBpQYwRrEyQyjuvk+Ev0K1Jc5tVDeJAuau3TGNgah4Yc hdHm3bkPjz9EErV85RwvImQ1dptvx6s7xzwXTgGAsaYZsL8WCwDaTuqFa1d1jjlaxg6+tZsB 9GluwvIhSezPgnEmimZDkGnZRRSFiGP8yjqTjjWuf0bSj5rUnTGiyLyRZRNGcXmu6hjlABEB AAHNJ1Rob21hcyBaaW1tZXJtYW5uIDx0emltbWVybWFubkBzdXNlLmRlPsLAjgQTAQgAOAIb AwULCQgHAgYVCgkICwIEFgIDAQIeAQIXgBYhBHIX+6yM6c9jRKFo5WgNwR1TC3ojBQJftODH AAoJEGgNwR1TC3ojx1wH/0hKGWugiqDgLNXLRD/4TfHBEKmxIrmfu9Z5t7vwUKfwhFL6hqvo lXPJJKQpQ2z8+X2vZm/slsLn7J1yjrOsoJhKABDi+3QWWSGkaGwRJAdPVVyJMfJRNNNIKwVb U6B1BkX2XDKDGffF4TxlOpSQzdtNI/9gleOoUA8+jy8knnDYzjBNOZqLG2FuTdicBXblz0Mf vg41gd9kCwYXDnD91rJU8tzylXv03E75NCaTxTM+FBXPmsAVYQ4GYhhgFt8S2UWMoaaABLDe 7l5FdnLdDEcbmd8uLU2CaG4W2cLrUaI4jz2XbkcPQkqTQ3EB67hYkjiEE6Zy3ggOitiQGcqp j//OwE0EWznS4AEIAMYmP4M/V+T5RY5at/g7rUdNsLhWv1APYrh9RQefODYHrNRHUE9eosYb T6XMryR9hT8XlGOYRwKWwiQBoWSDiTMo/Xi29jUnn4BXfI2px2DTXwc22LKtLAgTRjP+qbU6 3Y0xnQN29UGDbYgyyK51DW3H0If2a3JNsheAAK+Xc9baj0LGIc8T9uiEWHBnCH+RdhgATnWW GKdDegUR5BkDfDg5O/FISymJBHx2Dyoklv5g4BzkgqTqwmaYzsl8UxZKvbaxq0zbehDda8lv hFXodNFMAgTLJlLuDYOGLK2AwbrS3Sp0AEbkpdJBb44qVlGm5bApZouHeJ/+n+7r12+lqdsA EQEAAcLAdgQYAQgAIAIbDBYhBHIX+6yM6c9jRKFo5WgNwR1TC3ojBQJftOH6AAoJEGgNwR1T C3ojVSkIALpAPkIJPQoURPb1VWjh34l0HlglmYHvZszJWTXYwavHR8+k6Baa6H7ufXNQtThR yIxJrQLW6rV5lm7TjhffEhxVCn37+cg0zZ3j7zIsSS0rx/aMwi6VhFJA5hfn3T0TtrijKP4A SAQO9xD1Zk9/61JWk8OysuIh7MXkl0fxbRKWE93XeQBhIJHQfnc+YBLprdnxR446Sh8Wn/2D Ya8cavuWf2zrB6cZurs048xe0UbSW5AOSo4V9M0jzYI4nZqTmPxYyXbm30Kvmz0rYVRaitYJ 4kyYYMhuULvrJDMjZRvaNe52tkKAvMevcGdt38H4KSVXAylqyQOW5zvPc4/sq9c= In-Reply-To: <6d22bce3-4533-4cfa-96ba-64352b715741@linux.dev> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Flag: NO X-Spam-Score: -4.30 X-Spamd-Result: default: False [-4.30 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; RCVD_TLS_ALL(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; RCPT_COUNT_SEVEN(0.00)[7]; MIME_TRACE(0.00)[0:+]; MID_RHS_MATCH_FROM(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_HAS_DN(0.00)[]; FREEMAIL_CC(0.00)[gmail.com,ffwll.ch,linux.intel.com,kernel.org]; TO_DN_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FUZZY_BLOCKED(0.00)[rspamd.com]; DBL_BLOCKED_OPENRESOLVER(0.00)[bootlin.com:url] X-Spam-Level: Hi Am 18.06.25 um 18:03 schrieb Zenghui Yu: > Hi all, > > Running the dmabuf-heap test [*] on mainline kernel triggers the > following splat: > > ------------[ cut here ]------------ > DMA-API: platform vgem: mapping sg segment longer than device claims to > support [len=1048576] [max=65536] Thanks for the bug report. We have a possible fix in the latest drm-misc-next tree. Does it work if use replace DRM_GEM_SHMEM_DRIVER_OPS with DRM_GEM_SHMEM_DRIVER_OPS_NO_MAP_SGT at [1]? [1] https://elixir.bootlin.com/linux/v6.16-rc2/source/drivers/gpu/drm/vgem/vgem_drv.c#L118 Best regards Thomas > WARNING: CPU: 7 PID: 1126 at kernel/dma/debug.c:1174 > debug_dma_map_sg+0x348/0x3e4 > Modules linked in: vgem drm_shmem_helper drm_kms_helper rfkill drm fuse > backlight sha3_ce sha512_ce ipv6 > CPU: 7 UID: 0 PID: 1126 Comm: dmabuf-heap Kdump: loaded Not tainted > 6.16.0-rc2-00024-g9afe652958c3-dirty PREEMPT > Hardware name: QEMU QEMU Virtual Machine, BIOS > edk2-stable202408-prebuilt.qemu.org 08/13/2024 > pstate: 61400005 (nZCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--) > pc : debug_dma_map_sg+0x348/0x3e4 > lr : debug_dma_map_sg+0x348/0x3e4 > sp : ffff800084313a50 > x29: ffff800084313a50 x28: ffff0000c0a62480 x27: 0000000000000001 > x26: ffffffffffffffff x25: 0000000000000000 x24: ffff0000c0985f20 > x23: ffff8000815ab058 x22: 0000000000000001 x21: 0000000000000001 > x20: 0000000000000000 x19: ffff0000c2797010 x18: 0000000000000020 > x17: 0000000000000000 x16: 0000000000000000 x15: 00000000ffffffff > x14: ffff8000815c6390 x13: 00000000000005bb x12: 00000000000001e9 > x11: fffffffffffe8360 x10: ffff80008161e390 x9 : 00000000fffff000 > x8 : ffff8000815c6390 x7 : ffff80008161e390 x6 : 0000000000000000 > x5 : ffff0001fee21308 x4 : 0000000000000001 x3 : 0000000000000000 > x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff0000c5ea4600 > Call trace: > debug_dma_map_sg+0x348/0x3e4 (P) > __dma_map_sg_attrs+0xbc/0x118 > dma_map_sgtable+0x28/0x44 > system_heap_map_dma_buf+0x2c/0x64 > dma_buf_map_attachment+0x60/0x184 > dma_buf_map_attachment_unlocked+0x3c/0x7c > drm_gem_prime_import_dev.part.0+0x58/0x130 [drm] > drm_gem_prime_import+0x48/0xc4 [drm] > drm_gem_prime_fd_to_handle+0x180/0x220 [drm] > drm_prime_fd_to_handle_ioctl+0x38/0x44 [drm] > drm_ioctl_kernel+0xb8/0x12c [drm] > drm_ioctl+0x204/0x4ec [drm] > __arm64_sys_ioctl+0xac/0x104 > invoke_syscall+0x48/0x110 > el0_svc_common.constprop.0+0x40/0xe0 > do_el0_svc+0x1c/0x28 > el0_svc+0x34/0x108 > el0t_64_sync_handler+0xc8/0xcc > el0t_64_sync+0x198/0x19c > ---[ end trace 0000000000000000 ]--- > > The kernel is built with arm64's virtconfig and > > +CONFIG_DMABUF_HEAPS=y > +CONFIG_DMABUF_HEAPS_SYSTEM=y > +CONFIG_DRM_VGEM=m > +CONFIG_DMA_API_DEBUG=y > > [*] linux/tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c > > Thanks, > Zenghui -- -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstrasse 146, 90461 Nuernberg, Germany GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman HRB 36809 (AG Nuernberg)