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Message-ID: <4e4bb61a-377e-1ec9-5998-214055ef0a78@arm.com>
Date: Tue, 1 Mar 2022 10:56:05 +0000
From: Robin Murphy <robin.murphy@....com>
To: Matt Flax <flatmax@...il.com>, nsaenzjulienne@...e.de
Cc: ardb@...nel.org, catalin.marinas@....com,
devicetree@...r.kernel.org, guohanjun@...wei.com, hch@....de,
iommu@...ts.linux-foundation.org, jeremy.linton@....com,
linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
linux-riscv@...ts.infradead.org,
linux-rpi-kernel@...ts.infradead.org, lorenzo.pieralisi@....com,
robh+dt@...nel.org, will@...nel.org,
Matt Flax <flatmax@...tmax.com>
Subject: Re: [PATCH v7 0/7] arm64: Default to 32-bit wide ZONE_DMA
Hi Matt,
On 2022-03-01 03:00, Matt Flax wrote:
> Hi All,
>
> It seems that the ZONE_DMA changes have broken the operation of Rochip rk3399 chipsets from v5.10.22 onwards.
>
> It isn't clear what needs to be changed to get any of these boards up and running again. Any pointers on how/what to change ?
Your firmware/bootloader setup is mismatched. If you're using the
downstream Rockchip blob for BL31, you need to reserve or remove the
memory range 0x8400000-0x9600000 to match the behaviour of the original
Android BSP U-Boot. The downstream firmware firewalls this memory off
for the Secure world such that any attempt to touch it from Linux
results in a fatal SError fault as below. Any apparent correlation with
the ZONE_DMA changes will simply be because they've affected the
behaviour of the page allocator, such that it's more likely to reach
into the affected range of memory.
Cheers,
Robin.
> An easy test for debugging is to run stress :
>
> stress --cpu 4 --io 4 --vm 2 --vm-bytes 128M
>
> stress: info: [255] dispatching hogs: 4 cpu, 4 io, 2 vm, 0 hdd
> [ 8.070280] SError Interrupt on CPU4, code 0xbf000000 -- SError
> [ 8.070286] CPU: 4 PID: 261 Comm: stress Not tainted 5.10.21 #1
> [ 8.070289] Hardware name: FriendlyElec NanoPi M4 (DT)
> [ 8.070293] pstate: 00000005 (nzcv daif -PAN -UAO -TCO BTYPE=--)
> [ 8.070296] pc : clear_page+0x14/0x28
> [ 8.070298] lr : clear_subpage+0x50/0x90
> [ 8.070302] sp : ffff800012abbc40
> [ 8.070305] x29: ffff800012abbc40 x28: ffff000000f68000
> [ 8.070313] x27: 0000000000000000 x26: ffff000001f38e40
> [ 8.070320] x25: ffff8000114fd000 x24: 0000000000000000
> [ 8.070326] x23: 0000000000000000 x22: 0000000000001000
> [ 8.070334] x21: 0000ffffa7e00000 x20: fffffe0000010000
> [ 8.070341] x19: ffff000000f68000 x18: 0000000000000000
> [ 8.070348] x17: 0000000000000000 x16: 0000000000000000
> [ 8.070354] x15: 0000000000000002 x14: 0000000000000001
> [ 8.070361] x13: 0000000000075879 x12: 00000000000000c0
> [ 8.070368] x11: ffff80006c46a000 x10: 0000000000000200
> [ 8.070374] x9 : 0000000000000000 x8 : 0000000000000010
> [ 8.070381] x7 : ffff00007db800a0 x6 : ffff800011b899c0
> [ 8.070387] x5 : 0000000000000000 x4 : ffff00007db800f7
> [ 8.070394] x3 : 0000020000200000 x2 : 0000000000000004
> [ 8.070401] x1 : 0000000000000040 x0 : ffff0000085ff4c0
> [ 8.070409] Kernel panic - not syncing: Asynchronous SError Interrupt
> [ 8.070412] CPU: 4 PID: 261 Comm: stress Not tainted 5.10.21 #1
> [ 8.070415] Hardware name: FriendlyElec NanoPi M4 (DT)
> [ 8.070418] Call trace:
> [ 8.070420] dump_backtrace+0x0/0x1b0
> [ 8.070423] show_stack+0x18/0x70
> [ 8.070425] dump_stack+0xd0/0x12c
> [ 8.070428] panic+0x16c/0x334
> [ 8.070430] nmi_panic+0x8c/0x90
> [ 8.070433] arm64_serror_panic+0x78/0x84
> [ 8.070435] do_serror+0x64/0x70
> [ 8.070437] el1_error+0x88/0x108
> [ 8.070440] clear_page+0x14/0x28
> [ 8.070443] clear_huge_page+0x74/0x210
> [ 8.070445] do_huge_pmd_anonymous_page+0x1b0/0x7c0
> [ 8.070448] handle_mm_fault+0xdac/0x1290
> [ 8.070451] do_page_fault+0x130/0x3a0
> [ 8.070453] do_translation_fault+0xb0/0xc0
> [ 8.070456] do_mem_abort+0x44/0xb0
> [ 8.070458] el0_da+0x28/0x40
> [ 8.070461] el0_sync_handler+0x168/0x1b0
> [ 8.070464] el0_sync+0x174/0x180
> [ 8.070508] SError Interrupt on CPU0, code 0xbf000000 -- SError
> [ 8.070511] CPU: 0 PID: 258 Comm: stress Not tainted 5.10.21 #1
> [ 8.070515] Hardware name: FriendlyElec NanoPi M4 (DT)
> [ 8.070518] pstate: 80000000 (Nzcv daif -PAN -UAO -TCO BTYPE=--)
> [ 8.070520] pc : 0000aaaacec22e98
> [ 8.070523] lr : 0000aaaacec22d84
> [ 8.070525] sp : 0000ffffe67a8620
> [ 8.070528] x29: 0000ffffe67a8620 x28: 0000000000000003
> [ 8.070534] x27: 0000aaaacec34000 x26: 0000ffffaeb42610
> [ 8.070541] x25: 0000ffffa69af010 x24: 0000aaaacec23a98
> [ 8.070547] x23: 0000aaaacec35010 x22: 0000aaaacec35000
> [ 8.070554] x21: 0000000000001000 x20: ffffffffffffffff
> [ 8.070560] x19: 0000000008000000 x18: 0000000000000000
> [ 8.070567] x17: 0000000000000000 x16: 0000000000000000
> [ 8.070573] x15: 0000000000000000 x14: 0000000000000000
> [ 8.070580] x13: 0000000000008000 x12: 0000000000000000
> [ 8.070587] x11: 0000000000000020 x10: 0000000000000030
> [ 8.070593] x9 : 000000000000000a x8 : 00000000000000de
> [ 8.070599] x7 : 0000000000200000 x6 : 000000000000021b
> [ 8.070606] x5 : 0000000000000000 x4 : ffffffffffffffff
> [ 8.070613] x3 : 0000000000000000 x2 : 0000ffffaeb47000
> [ 8.070619] x1 : 000000000000005a x0 : 0000000000a58000
> [ 8.070629] SMP: stopping secondary CPUs
> [ 8.070632] Kernel Offset: disabled
> [ 8.070634] CPU features: 0x0240022,6100600c
> [ 8.070637] Memory Limit: none
>
>
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