On Fri, Dec 1, 2023 at 11:33 AM Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx> wrote:
>
> Now the APIs virtqueue_dma_sync_single_range_for_{cpu,device} ignore
> the parameter 'dir', that is a mistake.
>
> [ 6.101666] ------------[ cut here ]------------
> [ 6.102079] DMA-API: virtio-pci 0000:00:04.0: device driver syncs DMA memory with different direction [device address=0x00000000ae010000] [size=32752 bytes] [mapped with DMA_FROM_DEVICE] [synced with DMA_BIDIRECTIONAL]
> [ 6.103630] WARNING: CPU: 6 PID: 0 at kernel/dma/debug.c:1125 check_sync+0x53e/0x6c0
> [ 6.107420] CPU: 6 PID: 0 Comm: swapper/6 Tainted: G E 6.6.0+ #290
> [ 6.108030] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014
> [ 6.108936] RIP: 0010:check_sync+0x53e/0x6c0
> [ 6.109289] Code: 24 10 e8 f5 d9 74 00 4c 8b 4c 24 10 4c 8b 44 24 18 48 8b 4c 24 20 48 89 c6 41 56 4c 89 ea 48 c7 c7 b0 f1 50 82 e8 32 fc f3 ff <0f> 0b 48 c7 c7 48 4b 4a 82 e8 74 d9 fc ff 8b 73 4c 48 8d 7b 50 31
> [ 6.110750] RSP: 0018:ffffc90000180cd8 EFLAGS: 00010092
> [ 6.111178] RAX: 00000000000000ce RBX: ffff888100aa5900 RCX: 0000000000000000
> [ 6.111744] RDX: 0000000000000104 RSI: ffffffff824c3208 RDI: 00000000ffffffff
> [ 6.112316] RBP: ffffc90000180d40 R08: 0000000000000000 R09: 00000000fffeffff
> [ 6.112893] R10: ffffc90000180b98 R11: ffffffff82f63308 R12: ffffffff83d5af00
> [ 6.113460] R13: ffff888100998200 R14: ffffffff824a4b5f R15: 0000000000000286
> [ 6.114027] FS: 0000000000000000(0000) GS:ffff88842fd80000(0000) knlGS:0000000000000000
> [ 6.114665] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 6.115128] CR2: 00007f10f1e03030 CR3: 0000000108272004 CR4: 0000000000770ee0
> [ 6.115701] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 6.116272] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [ 6.116842] PKRU: 55555554
> [ 6.117069] Call Trace:
> [ 6.117275] <IRQ>
> [ 6.117452] ? __warn+0x84/0x140
> [ 6.117727] ? check_sync+0x53e/0x6c0
> [ 6.118034] ? __report_bug+0xea/0x100
> [ 6.118353] ? check_sync+0x53e/0x6c0
> [ 6.118653] ? report_bug+0x41/0xc0
> [ 6.118944] ? handle_bug+0x3c/0x70
> [ 6.119237] ? exc_invalid_op+0x18/0x70
> [ 6.119551] ? asm_exc_invalid_op+0x1a/0x20
> [ 6.119900] ? check_sync+0x53e/0x6c0
> [ 6.120199] ? check_sync+0x53e/0x6c0
> [ 6.120499] debug_dma_sync_single_for_cpu+0x5c/0x70
> [ 6.120906] ? dma_sync_single_for_cpu+0xb7/0x100
> [ 6.121291] virtnet_rq_unmap+0x158/0x170 [virtio_net]
> [ 6.121716] virtnet_receive+0x196/0x220 [virtio_net]
> [ 6.122135] virtnet_poll+0x48/0x1b0 [virtio_net]
> [ 6.122524] __napi_poll+0x29/0x1b0
> [ 6.123083] net_rx_action+0x282/0x360
> [ 6.123612] __do_softirq+0xf3/0x2fb
> [ 6.124138] __irq_exit_rcu+0x8e/0xf0
> [ 6.124663] common_interrupt+0xbc/0xe0
> [ 6.125202] </IRQ>
>
> We need to enable CONFIG_DMA_API_DEBUG and work with need sync mode(such
> as swiotlb) to reproduce this warn.
>
> Fixes: 8bd2f71054bd ("virtio_ring: introduce dma sync api for virtqueue")
> Reported-by: "Ning, Hongyu" <hongyu.ning@xxxxxxxxxxxxxxx>
> Closes: https://lore.kernel.org/all/f37cb55a-6fc8-4e21-8789-46d468325eea@xxxxxxxxxxxxxxx/
> Suggested-by: Jason Wang <jasowang@xxxxxxxxxx>
> Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
Thanks
