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] 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
