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Date: Tue, 18 Sep 2018 14:28:42 +0100
From: Robin Murphy <robin.murphy@....com>
To: Christoph Hellwig <hch@....de>, Will Deacon <will.deacon@....com>,
Catalin Marinas <catalin.marinas@....com>,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: linux-arm-kernel@...ts.infradead.org,
iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: move swiotlb noncoherent dma support from arm64 to generic code
Hi Christoph,
On 17/09/18 16:38, Christoph Hellwig wrote:
> Hi all,
>
> this series starts with various swiotlb cleanups, then adds support for
> non-cache coherent devices to the generic swiotlb support, and finally
> switches arm64 to use the generic code.
I think there's going to be an issue with the embedded folks' grubby
hack in arm64's mem_init() which skips initialising SWIOTLB at all with
sufficiently little DRAM. I've been waiting for
dma-direct-noncoherent-merge so that I could fix that case to swizzle in
dma_direct_ops and avoid swiotlb_dma_ops entirely.
> Given that this series depends on patches in the dma-mapping tree, or
> pending for it I've also published a git tree here:
>
> git://git.infradead.org/users/hch/misc.git swiotlb-noncoherent
However, upon sitting down to eagerly write that patch I've just
boot-tested the above branch as-is for a baseline and discovered a
rather more significant problem: arch_dma_alloc() is recursing back into
__swiotlb_alloc() and blowing the stack. Not good :(
Robin.
----->8-----
[ 4.032760] Insufficient stack space to handle exception!
[ 4.032765] ESR: 0x96000047 -- DABT (current EL)
[ 4.042666] FAR: 0xffff00000a937fb0
[ 4.046113] Task stack: [0xffff00000a938000..0xffff00000a93c000]
[ 4.052399] IRQ stack: [0xffff000008008000..0xffff00000800c000]
[ 4.058684] Overflow stack: [0xffff80097ff4b290..0xffff80097ff4c290]
[ 4.064972] CPU: 1 PID: 130 Comm: kworker/1:1 Not tainted 4.19.0-rc2+
#681
[ 4.071775] Hardware name: ARM LTD ARM Juno Development Platform/ARM
Juno Development Platform, BIOS EDK II Jul 10 2018
[ 4.082456] Workqueue: events deferred_probe_work_func
[ 4.087542] pstate: 00000005 (nzcv daif -PAN -UAO)
[ 4.092283] pc : arch_dma_alloc+0x0/0x198
[ 4.096250] lr : dma_direct_alloc+0x20/0x28
[ 4.100385] sp : ffff00000a938010
[ 4.103660] x29: ffff00000a938010 x28: ffff800974e15238
[ 4.108918] x27: ffff000008bf30d8 x26: ffff80097543d400
[ 4.114176] x25: 0000000000000300 x24: ffff80097543d400
[ 4.119434] x23: ffff800974e15238 x22: 0000000000001000
[ 4.124691] x21: ffff80097543d400 x20: 0000000000001000
[ 4.129948] x19: 0000000000000300 x18: ffffffffffffffff
[ 4.135206] x17: 0000000000000000 x16: ffff000008bf1b58
[ 4.140463] x15: ffff0000091eb688 x14: ffff00008a93ba1d
[ 4.145720] x13: ffffff0000000000 x12: 0000000000000000
[ 4.150977] x11: 0000000000000001 x10: ffffff7f7fff7fff
[ 4.156235] x9 : 0000000000000000 x8 : 0000000000000000
[ 4.161492] x7 : ffff800974df9810 x6 : 0000000000000000
[ 4.166749] x5 : 0000000000000000 x4 : 0000000000000300
[ 4.172006] x3 : 00000000006002c0 x2 : ffff800974e15238
[ 4.177263] x1 : 0000000000001000 x0 : ffff80097543d400
[ 4.182521] Kernel panic - not syncing: kernel stack overflow
[ 4.188207] CPU: 1 PID: 130 Comm: kworker/1:1 Not tainted 4.19.0-rc2+
#681
[ 4.195008] Hardware name: ARM LTD ARM Juno Development Platform/ARM
Juno Development Platform, BIOS EDK II Jul 10 2018
[ 4.205681] Workqueue: events deferred_probe_work_func
[ 4.210765] Call trace:
[ 4.213183] dump_backtrace+0x0/0x1f0
[ 4.216805] show_stack+0x14/0x20
[ 4.220084] dump_stack+0x9c/0xbc
[ 4.223362] panic+0x138/0x294
[ 4.226381] __stack_chk_fail+0x0/0x18
[ 4.230088] handle_bad_stack+0x11c/0x130
[ 4.234052] __bad_stack+0x88/0x8c
[ 4.237415] arch_dma_alloc+0x0/0x198
[ 4.241036] __swiotlb_alloc+0x3c/0x178
[ 4.244828] arch_dma_alloc+0xd0/0x198
[ 4.248534] dma_direct_alloc+0x20/0x28
[ 4.252327] __swiotlb_alloc+0x3c/0x178
[ 4.256119] arch_dma_alloc+0xd0/0x198
[ 4.259825] dma_direct_alloc+0x20/0x28
[ 4.263617] __swiotlb_alloc+0x3c/0x178
[ 4.267409] arch_dma_alloc+0xd0/0x198
[ 4.271115] dma_direct_alloc+0x20/0x28
[ 4.274907] __swiotlb_alloc+0x3c/0x178
[ 4.278700] arch_dma_alloc+0xd0/0x198
[ 4.282405] dma_direct_alloc+0x20/0x28
[ 4.286198] __swiotlb_alloc+0x3c/0x178
[ 4.289990] arch_dma_alloc+0xd0/0x198
[ 4.293696] dma_direct_alloc+0x20/0x28
[ 4.297489] __swiotlb_alloc+0x3c/0x178
[ 4.301281] arch_dma_alloc+0xd0/0x198
[ 4.304987] dma_direct_alloc+0x20/0x28
[ 4.308779] __swiotlb_alloc+0x3c/0x178
[ 4.312571] arch_dma_alloc+0xd0/0x198
[ 4.316277] dma_direct_alloc+0x20/0x28
[ 4.320069] __swiotlb_alloc+0x3c/0x178
[ 4.323861] arch_dma_alloc+0xd0/0x198
[ 4.327567] dma_direct_alloc+0x20/0x28
[ 4.331359] __swiotlb_alloc+0x3c/0x178
[ 4.335151] arch_dma_alloc+0xd0/0x198
[ 4.338857] dma_direct_alloc+0x20/0x28
[ 4.342650] __swiotlb_alloc+0x3c/0x178
[ 4.346442] arch_dma_alloc+0xd0/0x198
[ 4.350148] dma_direct_alloc+0x20/0x28
[ 4.353940] __swiotlb_alloc+0x3c/0x178
[ 4.357732] arch_dma_alloc+0xd0/0x198
[ 4.361438] dma_direct_alloc+0x20/0x28
[ 4.365230] __swiotlb_alloc+0x3c/0x178
[ 4.369022] arch_dma_alloc+0xd0/0x198
[ 4.372728] dma_direct_alloc+0x20/0x28
[ 4.376520] __swiotlb_alloc+0x3c/0x178
[ 4.380313] arch_dma_alloc+0xd0/0x198
[ 4.384018] dma_direct_alloc+0x20/0x28
[ 4.387811] __swiotlb_alloc+0x3c/0x178
[ 4.391603] arch_dma_alloc+0xd0/0x198
[ 4.395309] dma_direct_alloc+0x20/0x28
[ 4.399101] __swiotlb_alloc+0x3c/0x178
[ 4.402893] arch_dma_alloc+0xd0/0x198
[ 4.406599] dma_direct_alloc+0x20/0x28
[ 4.410391] __swiotlb_alloc+0x3c/0x178
[ 4.414183] arch_dma_alloc+0xd0/0x198
[ 4.417889] dma_direct_alloc+0x20/0x28
[ 4.421682] __swiotlb_alloc+0x3c/0x178
[ 4.425474] arch_dma_alloc+0xd0/0x198
[ 4.429180] dma_direct_alloc+0x20/0x28
[ 4.432972] __swiotlb_alloc+0x3c/0x178
[ 4.436764] arch_dma_alloc+0xd0/0x198
[ 4.440470] dma_direct_alloc+0x20/0x28
[ 4.444262] __swiotlb_alloc+0x3c/0x178
[ 4.448055] arch_dma_alloc+0xd0/0x198
[ 4.451760] dma_direct_alloc+0x20/0x28
[ 4.455553] __swiotlb_alloc+0x3c/0x178
[ 4.459345] arch_dma_alloc+0xd0/0x198
[ 4.463051] dma_direct_alloc+0x20/0x28
[ 4.466843] __swiotlb_alloc+0x3c/0x178
[ 4.470635] arch_dma_alloc+0xd0/0x198
[ 4.474341] dma_direct_alloc+0x20/0x28
[ 4.478134] __swiotlb_alloc+0x3c/0x178
[ 4.481926] arch_dma_alloc+0xd0/0x198
[ 4.485632] dma_direct_alloc+0x20/0x28
[ 4.489424] __swiotlb_alloc+0x3c/0x178
[ 4.493216] arch_dma_alloc+0xd0/0x198
[ 4.496922] dma_direct_alloc+0x20/0x28
[ 4.500714] __swiotlb_alloc+0x3c/0x178
[ 4.504506] arch_dma_alloc+0xd0/0x198
[ 4.508212] dma_direct_alloc+0x20/0x28
[ 4.512004] __swiotlb_alloc+0x3c/0x178
[ 4.515797] arch_dma_alloc+0xd0/0x198
[ 4.519502] dma_direct_alloc+0x20/0x28
[ 4.523295] __swiotlb_alloc+0x3c/0x178
[ 4.527087] arch_dma_alloc+0xd0/0x198
[ 4.530793] dma_direct_alloc+0x20/0x28
[ 4.534585] __swiotlb_alloc+0x3c/0x178
[ 4.538378] arch_dma_alloc+0xd0/0x198
[ 4.542083] dma_direct_alloc+0x20/0x28
[ 4.545876] __swiotlb_alloc+0x3c/0x178
[ 4.549668] arch_dma_alloc+0xd0/0x198
[ 4.553374] dma_direct_alloc+0x20/0x28
[ 4.557166] __swiotlb_alloc+0x3c/0x178
[ 4.560958] arch_dma_alloc+0xd0/0x198
[ 4.564664] dma_direct_alloc+0x20/0x28
[ 4.568456] __swiotlb_alloc+0x3c/0x178
[ 4.572248] arch_dma_alloc+0xd0/0x198
[ 4.575954] dma_direct_alloc+0x20/0x28
[ 4.579747] __swiotlb_alloc+0x3c/0x178
[ 4.583539] arch_dma_alloc+0xd0/0x198
[ 4.587245] dma_direct_alloc+0x20/0x28
[ 4.591037] __swiotlb_alloc+0x3c/0x178
[ 4.594829] arch_dma_alloc+0xd0/0x198
[ 4.598535] dma_direct_alloc+0x20/0x28
[ 4.602327] __swiotlb_alloc+0x3c/0x178
[ 4.606120] arch_dma_alloc+0xd0/0x198
[ 4.609826] dma_direct_alloc+0x20/0x28
[ 4.613618] __swiotlb_alloc+0x3c/0x178
[ 4.617410] arch_dma_alloc+0xd0/0x198
[ 4.621116] dma_direct_alloc+0x20/0x28
[ 4.624908] __swiotlb_alloc+0x3c/0x178
[ 4.628701] arch_dma_alloc+0xd0/0x198
[ 4.632407] dma_direct_alloc+0x20/0x28
[ 4.636199] __swiotlb_alloc+0x3c/0x178
[ 4.639991] arch_dma_alloc+0xd0/0x198
[ 4.643697] dma_direct_alloc+0x20/0x28
[ 4.647490] __swiotlb_alloc+0x3c/0x178
[ 4.651282] arch_dma_alloc+0xd0/0x198
[ 4.654988] dma_direct_alloc+0x20/0x28
[ 4.658780] __swiotlb_alloc+0x3c/0x178
[ 4.662572] arch_dma_alloc+0xd0/0x198
[ 4.666278] dma_direct_alloc+0x20/0x28
[ 4.670070] __swiotlb_alloc+0x3c/0x178
[ 4.673862] arch_dma_alloc+0xd0/0x198
[ 4.677568] dma_direct_alloc+0x20/0x28
[ 4.681361] __swiotlb_alloc+0x3c/0x178
[ 4.685153] arch_dma_alloc+0xd0/0x198
[ 4.688859] dma_direct_alloc+0x20/0x28
[ 4.692651] __swiotlb_alloc+0x3c/0x178
[ 4.696443] arch_dma_alloc+0xd0/0x198
[ 4.700148] dma_direct_alloc+0x20/0x28
[ 4.703941] __swiotlb_alloc+0x3c/0x178
[ 4.707733] arch_dma_alloc+0xd0/0x198
[ 4.711439] dma_direct_alloc+0x20/0x28
[ 4.715231] __swiotlb_alloc+0x3c/0x178
[ 4.719023] arch_dma_alloc+0xd0/0x198
[ 4.722729] dma_direct_alloc+0x20/0x28
[ 4.726522] __swiotlb_alloc+0x3c/0x178
[ 4.730313] arch_dma_alloc+0xd0/0x198
[ 4.734019] dma_direct_alloc+0x20/0x28
[ 4.737811] __swiotlb_alloc+0x3c/0x178
[ 4.741604] arch_dma_alloc+0xd0/0x198
[ 4.745310] dma_direct_alloc+0x20/0x28
[ 4.749102] __swiotlb_alloc+0x3c/0x178
[ 4.752894] arch_dma_alloc+0xd0/0x198
[ 4.756600] dma_direct_alloc+0x20/0x28
[ 4.760393] __swiotlb_alloc+0x3c/0x178
[ 4.764185] arch_dma_alloc+0xd0/0x198
[ 4.767891] dma_direct_alloc+0x20/0x28
[ 4.771683] __swiotlb_alloc+0x3c/0x178
[ 4.775475] arch_dma_alloc+0xd0/0x198
[ 4.779181] dma_direct_alloc+0x20/0x28
[ 4.782973] __swiotlb_alloc+0x3c/0x178
[ 4.786765] arch_dma_alloc+0xd0/0x198
[ 4.790471] dma_direct_alloc+0x20/0x28
[ 4.794263] __swiotlb_alloc+0x3c/0x178
[ 4.798055] arch_dma_alloc+0xd0/0x198
[ 4.801761] dma_direct_alloc+0x20/0x28
[ 4.805553] __swiotlb_alloc+0x3c/0x178
[ 4.809345] arch_dma_alloc+0xd0/0x198
[ 4.813051] dma_direct_alloc+0x20/0x28
[ 4.816844] __swiotlb_alloc+0x3c/0x178
[ 4.820636] arch_dma_alloc+0xd0/0x198
[ 4.824342] dma_direct_alloc+0x20/0x28
[ 4.828134] __swiotlb_alloc+0x3c/0x178
[ 4.831926] arch_dma_alloc+0xd0/0x198
[ 4.835632] dma_direct_alloc+0x20/0x28
[ 4.839425] __swiotlb_alloc+0x3c/0x178
[ 4.843217] arch_dma_alloc+0xd0/0x198
[ 4.846923] dma_direct_alloc+0x20/0x28
[ 4.850715] __swiotlb_alloc+0x3c/0x178
[ 4.854507] arch_dma_alloc+0xd0/0x198
[ 4.858212] dma_direct_alloc+0x20/0x28
[ 4.862005] __swiotlb_alloc+0x3c/0x178
[ 4.865797] arch_dma_alloc+0xd0/0x198
[ 4.869503] dma_direct_alloc+0x20/0x28
[ 4.873295] __swiotlb_alloc+0x3c/0x178
[ 4.877087] arch_dma_alloc+0xd0/0x198
[ 4.880793] dma_direct_alloc+0x20/0x28
[ 4.884586] __swiotlb_alloc+0x3c/0x178
[ 4.888377] arch_dma_alloc+0xd0/0x198
[ 4.892083] dma_direct_alloc+0x20/0x28
[ 4.895875] __swiotlb_alloc+0x3c/0x178
[ 4.899667] arch_dma_alloc+0xd0/0x198
[ 4.903373] dma_direct_alloc+0x20/0x28
[ 4.907165] __swiotlb_alloc+0x3c/0x178
[ 4.910957] arch_dma_alloc+0xd0/0x198
[ 4.914663] dma_direct_alloc+0x20/0x28
[ 4.918455] __swiotlb_alloc+0x3c/0x178
[ 4.922247] arch_dma_alloc+0xd0/0x198
[ 4.925953] dma_direct_alloc+0x20/0x28
[ 4.929746] __swiotlb_alloc+0x3c/0x178
[ 4.933538] arch_dma_alloc+0xd0/0x198
[ 4.937244] dma_direct_alloc+0x20/0x28
[ 4.941036] __swiotlb_alloc+0x3c/0x178
[ 4.944828] arch_dma_alloc+0xd0/0x198
[ 4.948534] dma_direct_alloc+0x20/0x28
[ 4.952327] __swiotlb_alloc+0x3c/0x178
[ 4.956119] arch_dma_alloc+0xd0/0x198
[ 4.959825] dma_direct_alloc+0x20/0x28
[ 4.963617] __swiotlb_alloc+0x3c/0x178
[ 4.967409] arch_dma_alloc+0xd0/0x198
[ 4.971115] dma_direct_alloc+0x20/0x28
[ 4.974907] __swiotlb_alloc+0x3c/0x178
[ 4.978699] arch_dma_alloc+0xd0/0x198
[ 4.982405] dma_direct_alloc+0x20/0x28
[ 4.986197] __swiotlb_alloc+0x3c/0x178
[ 4.989990] arch_dma_alloc+0xd0/0x198
[ 4.993695] dma_direct_alloc+0x20/0x28
[ 4.997488] __swiotlb_alloc+0x3c/0x178
[ 5.001280] arch_dma_alloc+0xd0/0x198
[ 5.004986] dma_direct_alloc+0x20/0x28
[ 5.008778] __swiotlb_alloc+0x3c/0x178
[ 5.012570] arch_dma_alloc+0xd0/0x198
[ 5.016276] dma_direct_alloc+0x20/0x28
[ 5.020069] __swiotlb_alloc+0x3c/0x178
[ 5.023861] arch_dma_alloc+0xd0/0x198
[ 5.027567] dma_direct_alloc+0x20/0x28
[ 5.031359] __swiotlb_alloc+0x3c/0x178
[ 5.035151] arch_dma_alloc+0xd0/0x198
[ 5.038857] dma_direct_alloc+0x20/0x28
[ 5.042650] __swiotlb_alloc+0x3c/0x178
[ 5.046442] arch_dma_alloc+0xd0/0x198
[ 5.050148] dma_direct_alloc+0x20/0x28
[ 5.053940] __swiotlb_alloc+0x3c/0x178
[ 5.057732] arch_dma_alloc+0xd0/0x198
[ 5.061438] dma_direct_alloc+0x20/0x28
[ 5.065230] __swiotlb_alloc+0x3c/0x178
[ 5.069023] arch_dma_alloc+0xd0/0x198
[ 5.072728] dma_direct_alloc+0x20/0x28
[ 5.076521] __swiotlb_alloc+0x3c/0x178
[ 5.080313] arch_dma_alloc+0xd0/0x198
[ 5.084019] dma_direct_alloc+0x20/0x28
[ 5.087811] __swiotlb_alloc+0x3c/0x178
[ 5.091604] arch_dma_alloc+0xd0/0x198
[ 5.095309] dma_direct_alloc+0x20/0x28
[ 5.099102] __swiotlb_alloc+0x3c/0x178
[ 5.102894] arch_dma_alloc+0xd0/0x198
[ 5.106600] dma_direct_alloc+0x20/0x28
[ 5.110392] __swiotlb_alloc+0x3c/0x178
[ 5.114184] arch_dma_alloc+0xd0/0x198
[ 5.117890] dma_direct_alloc+0x20/0x28
[ 5.121682] __swiotlb_alloc+0x3c/0x178
[ 5.125474] arch_dma_alloc+0xd0/0x198
[ 5.129180] dma_direct_alloc+0x20/0x28
[ 5.132973] __swiotlb_alloc+0x3c/0x178
[ 5.136765] arch_dma_alloc+0xd0/0x198
[ 5.140470] dma_direct_alloc+0x20/0x28
[ 5.144262] __swiotlb_alloc+0x3c/0x178
[ 5.148054] arch_dma_alloc+0xd0/0x198
[ 5.151760] dma_direct_alloc+0x20/0x28
[ 5.155552] __swiotlb_alloc+0x3c/0x178
[ 5.159345] arch_dma_alloc+0xd0/0x198
[ 5.163050] dma_direct_alloc+0x20/0x28
[ 5.166843] __swiotlb_alloc+0x3c/0x178
[ 5.170635] arch_dma_alloc+0xd0/0x198
[ 5.174341] dma_direct_alloc+0x20/0x28
[ 5.178133] __swiotlb_alloc+0x3c/0x178
[ 5.181925] arch_dma_alloc+0xd0/0x198
[ 5.185631] dma_direct_alloc+0x20/0x28
[ 5.189423] __swiotlb_alloc+0x3c/0x178
[ 5.193215] arch_dma_alloc+0xd0/0x198
[ 5.196921] dma_direct_alloc+0x20/0x28
[ 5.200714] __swiotlb_alloc+0x3c/0x178
[ 5.204506] arch_dma_alloc+0xd0/0x198
[ 5.208212] swiotlb_alloc+0x20/0x28
[ 5.211748] pl330_probe+0x344/0xaf0
[ 5.215283] amba_probe+0xe8/0x1b8
[ 5.218646] really_probe+0xdc/0x3d0
[ 5.222181] driver_probe_device+0x5c/0x148
[ 5.226318] __device_attach_driver+0xa8/0x160
[ 5.230712] bus_for_each_drv+0x64/0xc8
[ 5.234505] __device_attach+0xd8/0x158
[ 5.238298] device_initial_probe+0x10/0x18
[ 5.242434] bus_probe_device+0x90/0x98
[ 5.246227] deferred_probe_work_func+0x88/0xe0
[ 5.250708] process_one_work+0x1e0/0x330
[ 5.254673] worker_thread+0x238/0x460
[ 5.258380] kthread+0x128/0x130
[ 5.261571] ret_from_fork+0x10/0x1c
[ 5.265109] SMP: stopping secondary CPUs
[ 5.268990] Kernel Offset: disabled
[ 5.272438] CPU features: 0x0,25806004
[ 5.276143] Memory Limit: none
[ 5.279168] ---[ end Kernel panic - not syncing: kernel stack
overflow ]---
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