linux-kernel - Re: [PATCH v7u1 26/31] x86: Don't enable swiotlb if there is not enough ram for it

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Date:	Tue, 8 Jan 2013 16:56:00 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Shuah Khan <shuahkhan@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>, Jan Kiszka <jan.kiszka@....de>,
	Jason Wessel <jason.wessel@...driver.com>,
	linux-kernel@...r.kernel.org, Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH v7u1 26/31] x86: Don't enable swiotlb if there is not
 enough ram for it

On Tue, Jan 8, 2013 at 4:43 PM, Konrad Rzeszutek Wilk
<konrad.wilk@...cle.com> wrote:
> The swiotlb_full check I don't believe is neccessary. You won't ever get
> to that unless swiotlb_map_page has at least provided a bounce buffer.

yes, the code get there, when I boot the kernel with
"memmap=4095M$1M intel_iommu=off"

please check the call trace:

[  209.878091] usb 1-3: new high-speed USB device number 2 using ehci-pci
[  209.878096] DMA: Out of SW-IOMMU space for 8 bytes at device 0000:00:1a.7
[  209.878117] Kernel panic - not syncing: DMA: Random memory could be DMA read
[  209.878117]
[  209.878120] Pid: 2057, comm: khubd Not tainted
3.8.0-rc2-yh-00443-g262039c-dirty #1091
[  209.878121] Call Trace:
[  209.878132]  [<ffffffff8214a607>] panic+0xc0/0x1ce
[  209.878143]  [<ffffffff814dc013>] swiotlb_full+0xa3/0xc0
[  209.878147]  [<ffffffff814dccf3>] swiotlb_map_page+0x93/0xe0
[  209.878157]  [<ffffffff81c6800d>] usb_hcd_map_urb_for_dma+0xcd/0x510
[  209.878166]  [<ffffffff810eb758>] ? lockdep_init_map+0x518/0x570
[  209.878170]  [<ffffffff81c68a0d>] usb_hcd_submit_urb+0x5bd/0x690
[  209.878174]  [<ffffffff81c699b6>] usb_submit_urb+0x306/0x3c0
[  209.878179]  [<ffffffff81c6abb2>] usb_start_wait_urb+0x82/0x120
[  209.878183]  [<ffffffff81c69f7e>] ? usb_alloc_urb+0x1e/0x60
[  209.878187]  [<ffffffff81c6aeae>] usb_control_msg+0xde/0x130
[  209.878194]  [<ffffffff81196f80>] ? kmem_cache_alloc_trace+0x60/0x150
[  209.878198]  [<ffffffff81c62ad7>] hub_port_init+0x2a7/0xa10
[  209.878203]  [<ffffffff81c65542>] hub_port_connect_change+0x492/0x9c0
[  209.878211]  [<ffffffff82163f4e>] ? mutex_unlock+0xe/0x10
[  209.878215]  [<ffffffff81c65f9b>] hub_thread+0x52b/0x830
[  209.878222]  [<ffffffff810c3f94>] ? local_clock+0x34/0x60
[  209.878229]  [<ffffffff810afa00>] ? wake_up_bit+0x40/0x40
[  209.878233]  [<ffffffff81c65a70>] ? hub_port_connect_change+0x9c0/0x9c0
[  209.878237]  [<ffffffff810af088>] kthread+0xe8/0xf0
[  209.878241]  [<ffffffff810aefa0>] ? __init_kthread_worker+0x70/0x70
[  209.878248]  [<ffffffff8216f59c>] ret_from_fork+0x7c/0xb0
[  209.878251]  [<ffffffff810aefa0>] ? __init_kthread_worker+0x70/0x70
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