From: Frederik Schwan <frederik.schwan@linux.com>
To: iommu@lists.linux-foundation.org
Cc: David Woodhouse <dwmw2@infradead.org>
Subject: Regression iommu/vt-d bounce buffer
Date: Mon, 6 Jan 2020 16:43:05 +0100 [thread overview]
Message-ID: <fe41dfaa-e899-0d6c-69e4-0379be376c09@linux.com> (raw)
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Hello people,
since the introduction of the bounce buffer, a regression with TB3 devices has been introduced.
USB devices attached to TB3 refuse to work since. Removing the commits that introduced the bounce buffer, fixes the issue.
Commits:
3b53034c268d550d9e8522e613a14ab53b8840d8
c5a5dc4cbbf4540c1891cdb2b70cf469405ea61f
cfb94a372f2d4ee226247447c863f8709863d170
e5e04d051979dbd636a99099b7a595093c50a4bc
An excerpt of the trace:
> [ +0,000005] WARNING: CPU: 10 PID: 0 at drivers/iommu/intel-iommu.c:3916 bounce_unmap_single+0x103/0x110
> [...]
> [ +0,000001] Call Trace:
> [ +0,000002] <IRQ>
> [ +0,000003] usb_hcd_unmap_urb_setup_for_dma+0x9f/0xe0
> [ +0,000001] usb_hcd_unmap_urb_for_dma+0x1c/0x170
> [ +0,000002] __usb_hcd_giveback_urb+0x36/0x120
> [ +0,000008] xhci_giveback_urb_in_irq.isra.0+0x72/0x100 [xhci_hcd]
> [ +0,000007] xhci_td_cleanup+0x101/0x140 [xhci_hcd]
> [ +0,000007] xhci_irq+0xbf0/0x1db0 [xhci_hcd]
> [ +0,000005] __handle_irq_event_percpu+0x44/0x1b0
> [ +0,000002] handle_irq_event_percpu+0x34/0x80
> [ +0,000002] handle_irq_event+0x37/0x54
> [ +0,000002] handle_edge_irq+0xae/0x1f0
> [ +0,000002] do_IRQ+0x84/0x140
> [ +0,000003] common_interrupt+0xf/0xf
> [ +0,000001] </IRQ>
Dmesg log and further information have been posted here: https://bugzilla.kernel.org/show_bug.cgi?id=205893
Cheers,
Frederik
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next reply other threads:[~2020-01-06 15:52 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-06 15:43 Frederik Schwan [this message]
2020-01-10 16:28 ` Regression iommu/vt-d bounce buffer Joerg Roedel
2020-01-13 2:37 ` Lu Baolu
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