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Date: Mon, 15 Nov 2021 20:21:06 +0800
From: Yunsheng Lin <linyunsheng@...wei.com>
To: Ilias Apalodimas <ilias.apalodimas@...aro.org>
CC: Guillaume Tucker <guillaume.tucker@...labora.com>,
<davem@...emloft.net>, <kuba@...nel.org>, <netdev@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linuxarm@...neuler.org>,
<hawk@...nel.org>, <akpm@...ux-foundation.org>,
<peterz@...radead.org>, <will@...nel.org>, <jhubbard@...dia.com>,
<yuzhao@...gle.com>, <mcroce@...rosoft.com>,
<fenghua.yu@...el.com>, <feng.tang@...el.com>, <jgg@...pe.ca>,
<aarcange@...hat.com>, <guro@...com>,
"kernelci@...ups.io" <kernelci@...ups.io>
Subject: Re: [PATCH net-next v6] page_pool: disable dma mapping support for
32-bit arch with 64-bit DMA
On 2021/11/15 20:10, Ilias Apalodimas wrote:
> On Mon, 15 Nov 2021 at 13:53, Ilias Apalodimas
> <ilias.apalodimas@...aro.org> wrote:
>>
>> On Mon, Nov 15, 2021 at 11:34:59AM +0800, Yunsheng Lin wrote:
>>> On 2021/11/12 17:21, Guillaume Tucker wrote:
>>>> On 09/11/2021 12:02, Yunsheng Lin wrote:
>>>>> On 2021/11/9 17:58, Guillaume Tucker wrote:
>>>>>> Hi Yunsheng,
>>>>>>
>>>>>> Please see the bisection report below about a boot failure on
>>>>>> rk3288-rock2-square which is pointing to this patch. The issue
>>>>>> appears to only happen with CONFIG_ARM_LPAE=y.
>>>>>>
>>>>>> Reports aren't automatically sent to the public while we're
>>>>>> trialing new bisection features on kernelci.org but this one
>>>>>> looks valid.
>>>>>>
>>>>>> Some more details can be found here:
>>>>>>
>>>>>> https://linux.kernelci.org/test/case/id/6189968c3ec0a3c06e3358fe/
>>>>>>
>>>>>> Here's the same revision on the same platform booting fine with a
>>>>>> plain multi_v7_defconfig build:
>>>>>>
>>>>>> https://linux.kernelci.org/test/plan/id/61899d322c0e9fee7e3358ec/
>>>>>>
>>>>>> Please let us know if you need any help debugging this issue or
>>>>>> if you have a fix to try.
>>>>>
>>>>> The patch below is removing the dma mapping support in page pool
>>>>> for 32 bit systems with 64 bit dma address, so it seems there
>>>>> is indeed a a drvier using the the page pool with PP_FLAG_DMA_MAP
>>>>> flags set in a 32 bit systems with 64 bit dma address.
>>>>>
>>>>> It seems we might need to revert the below patch or implement the
>>>>> DMA-mapping tracking support in the driver as mentioned in the below
>>>>> commit log.
>>>>>
>>>>> which ethernet driver do you use in your system?
>>>>
>>>> Thanks for taking a look and sorry for the slow reply. Here's a
>>>> booting test job with LPAE disabled:
>>>>
>>>> https://linux.kernelci.org/test/plan/id/618dbb81c60c4d94503358f1/
>>>> https://storage.kernelci.org/mainline/master/v5.15-12452-g5833291ab6de/arm/multi_v7_defconfig/gcc-10/lab-collabora/baseline-nfs-rk3288-rock2-square.html#L812
>>>>
>>>> [ 8.314523] rk_gmac-dwmac ff290000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
>>>>
>>>> So the driver is drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
>>>
>>> Thanks for the report, this patch seems to cause problem for 32-bit
>>> system with LPAE enabled.
>>>
>>> As LPAE seems like a common feature for 32 bits system, this patch
>>> might need to be reverted.
>>>
>>> @Jesper, @Ilias, what do you think?
>>
>>
>> So enabling LPAE also enables CONFIG_ARCH_DMA_ADDR_T_64BIT on that board?
>> Doing a quick grep only selects that for XEN. I am ok reverting that, but
>> I think we need to understand how the dma address ended up being 64bit.
>
> So looking a bit closer, indeed enabling LPAE always enables this. So
> we need to revert the patch.
> Yunsheng will you send that?
Sure.
>
> Thanks
> /Ilias
>>
>> Regards
>> /Ilias
>>
>>>
>>>>
>>>> Best wishes,
>>>> Guillaume
>>>>
>>>>
>>>>>> GitHub: https://github.com/kernelci/kernelci-project/issues/71
>>>>>>
>>>>>> -------------------------------------------------------------------------------
>>>>>>
>>>>>> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
>>>>>> * This automated bisection report was sent to you on the basis *
>>>>>> * that you may be involved with the breaking commit it has *
>>>>>> * found. No manual investigation has been done to verify it, *
>>>>>> * and the root cause of the problem may be somewhere else. *
>>>>>> * *
>>>>>> * If you do send a fix, please include this trailer: *
>>>>>> * Reported-by: "kernelci.org bot" <bot@...nelci.org> *
>>>>>> * *
>>>>>> * Hope this helps! *
>>>>>> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
>>>>>>
>>>>>> mainline/master bisection: baseline.login on rk3288-rock2-square
>>>>>>
>>>>>> Summary:
>>>>>> Start: e851dfae4371d Merge tag 'kgdb-5.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux
>>>>>> Plain log: https://storage.kernelci.org/mainline/master/v5.15-11387-ge851dfae4371/arm/multi_v7_defconfig+CONFIG_EFI=y+CONFIG_ARM_LPAE=y/gcc-10/lab-collabora/baseline-rk3288-rock2-square.txt
>>>>>> HTML log: https://storage.kernelci.org/mainline/master/v5.15-11387-ge851dfae4371/arm/multi_v7_defconfig+CONFIG_EFI=y+CONFIG_ARM_LPAE=y/gcc-10/lab-collabora/baseline-rk3288-rock2-square.html
>>>>>> Result: d00e60ee54b12 page_pool: disable dma mapping support for 32-bit arch with 64-bit DMA
>>>>>>
>>>>>> Checks:
>>>>>> revert: PASS
>>>>>> verify: PASS
>>>>>>
>>>>>> Parameters:
>>>>>> Tree: mainline
>>>>>> URL: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>>>>> Branch: master
>>>>>> Target: rk3288-rock2-square
>>>>>> CPU arch: arm
>>>>>> Lab: lab-collabora
>>>>>> Compiler: gcc-10
>>>>>> Config: multi_v7_defconfig+CONFIG_EFI=y+CONFIG_ARM_LPAE=y
>>>>>> Test case: baseline.login
>>>>>>
>>>>>> Breaking commit found:
>>>>>>
>>>>>> -------------------------------------------------------------------------------
>>>>>> commit d00e60ee54b12de945b8493cf18c1ada9e422514
>>>>>> Author: Yunsheng Lin <linyunsheng@...wei.com>
>>>>>> Date: Wed Oct 13 17:19:20 2021 +0800
>>>>>>
>>>>>> page_pool: disable dma mapping support for 32-bit arch with 64-bit DMA
>>>>>>
>>>>>>
>>>>>> On 13/10/2021 10:19, Yunsheng Lin wrote:
>>>>>>> As the 32-bit arch with 64-bit DMA seems to rare those days,
>>>>>>> and page pool might carry a lot of code and complexity for
>>>>>>> systems that possibly.
>>>>>>>
>>>>>>> So disable dma mapping support for such systems, if drivers
>>>>>>> really want to work on such systems, they have to implement
>>>>>>> their own DMA-mapping fallback tracking outside page_pool.
>>>>>>>
>>>>>>> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>
>>>>>>> Signed-off-by: Yunsheng Lin <linyunsheng@...wei.com>
>>>>>>> ---
>>>>>>> V6: Drop pp page tracking support
>>>>>>> ---
>>>>>>> include/linux/mm_types.h | 13 +------------
>>>>>>> include/net/page_pool.h | 12 +-----------
>>>>>>> net/core/page_pool.c | 10 ++++++----
>>>>>>> 3 files changed, 8 insertions(+), 27 deletions(-)
>>>>>>>
>>>>>>> diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
>>>>>>> index 7f8ee09c711f..436e0946d691 100644
>>>>>>> --- a/include/linux/mm_types.h
>>>>>>> +++ b/include/linux/mm_types.h
>>>>>>> @@ -104,18 +104,7 @@ struct page {
>>>>>>> struct page_pool *pp;
>>>>>>> unsigned long _pp_mapping_pad;
>>>>>>> unsigned long dma_addr;
>>>>>>> - union {
>>>>>>> - /**
>>>>>>> - * dma_addr_upper: might require a 64-bit
>>>>>>> - * value on 32-bit architectures.
>>>>>>> - */
>>>>>>> - unsigned long dma_addr_upper;
>>>>>>> - /**
>>>>>>> - * For frag page support, not supported in
>>>>>>> - * 32-bit architectures with 64-bit DMA.
>>>>>>> - */
>>>>>>> - atomic_long_t pp_frag_count;
>>>>>>> - };
>>>>>>> + atomic_long_t pp_frag_count;
>>>>>>> };
>>>>>>> struct { /* slab, slob and slub */
>>>>>>> union {
>>>>>>> diff --git a/include/net/page_pool.h b/include/net/page_pool.h
>>>>>>> index a4082406a003..3855f069627f 100644
>>>>>>> --- a/include/net/page_pool.h
>>>>>>> +++ b/include/net/page_pool.h
>>>>>>> @@ -216,24 +216,14 @@ static inline void page_pool_recycle_direct(struct page_pool *pool,
>>>>>>> page_pool_put_full_page(pool, page, true);
>>>>>>> }
>>>>>>>
>>>>>>> -#define PAGE_POOL_DMA_USE_PP_FRAG_COUNT \
>>>>>>> - (sizeof(dma_addr_t) > sizeof(unsigned long))
>>>>>>> -
>>>>>>> static inline dma_addr_t page_pool_get_dma_addr(struct page *page)
>>>>>>> {
>>>>>>> - dma_addr_t ret = page->dma_addr;
>>>>>>> -
>>>>>>> - if (PAGE_POOL_DMA_USE_PP_FRAG_COUNT)
>>>>>>> - ret |= (dma_addr_t)page->dma_addr_upper << 16 << 16;
>>>>>>> -
>>>>>>> - return ret;
>>>>>>> + return page->dma_addr;
>>>>>>> }
>>>>>>>
>>>>>>> static inline void page_pool_set_dma_addr(struct page *page, dma_addr_t addr)
>>>>>>> {
>>>>>>> page->dma_addr = addr;
>>>>>>> - if (PAGE_POOL_DMA_USE_PP_FRAG_COUNT)
>>>>>>> - page->dma_addr_upper = upper_32_bits(addr);
>>>>>>> }
>>>>>>>
>>>>>>> static inline void page_pool_set_frag_count(struct page *page, long nr)
>>>>>>> diff --git a/net/core/page_pool.c b/net/core/page_pool.c
>>>>>>> index 1a6978427d6c..9b60e4301a44 100644
>>>>>>> --- a/net/core/page_pool.c
>>>>>>> +++ b/net/core/page_pool.c
>>>>>>> @@ -49,6 +49,12 @@ static int page_pool_init(struct page_pool *pool,
>>>>>>> * which is the XDP_TX use-case.
>>>>>>> */
>>>>>>> if (pool->p.flags & PP_FLAG_DMA_MAP) {
>>>>>>> + /* DMA-mapping is not supported on 32-bit systems with
>>>>>>> + * 64-bit DMA mapping.
>>>>>>> + */
>>>>>>> + if (sizeof(dma_addr_t) > sizeof(unsigned long))
>>>>>>> + return -EOPNOTSUPP;
>>>>>>> +
>>>>>>> if ((pool->p.dma_dir != DMA_FROM_DEVICE) &&
>>>>>>> (pool->p.dma_dir != DMA_BIDIRECTIONAL))
>>>>>>> return -EINVAL;
>>>>>>> @@ -69,10 +75,6 @@ static int page_pool_init(struct page_pool *pool,
>>>>>>> */
>>>>>>> }
>>>>>>>
>>>>>>> - if (PAGE_POOL_DMA_USE_PP_FRAG_COUNT &&
>>>>>>> - pool->p.flags & PP_FLAG_PAGE_FRAG)
>>>>>>> - return -EINVAL;
>>>>>>> -
>>>>>>> if (ptr_ring_init(&pool->ring, ring_qsize, GFP_KERNEL) < 0)
>>>>>>> return -ENOMEM;
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> Git bisection log:
>>>>>>
>>>>>> -------------------------------------------------------------------------------
>>>>>> git bisect start
>>>>>> # good: [bfc484fe6abba4b89ec9330e0e68778e2a9856b2] Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
>>>>>> git bisect good bfc484fe6abba4b89ec9330e0e68778e2a9856b2
>>>>>> # bad: [e851dfae4371d3c751f1e18e8eb5eba993de1467] Merge tag 'kgdb-5.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux
>>>>>> git bisect bad e851dfae4371d3c751f1e18e8eb5eba993de1467
>>>>>> # bad: [dcd68326d29b62f3039e4f4d23d3e38f24d37360] Merge tag 'devicetree-for-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux
>>>>>> git bisect bad dcd68326d29b62f3039e4f4d23d3e38f24d37360
>>>>>> # bad: [b7b98f868987cd3e86c9bd9a6db048614933d7a0] Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
>>>>>> git bisect bad b7b98f868987cd3e86c9bd9a6db048614933d7a0
>>>>>> # bad: [9fd3d5dced976640f588e0a866b9611db2d2cb37] net: ethernet: ave: Add compatible string and SoC-dependent data for NX1 SoC
>>>>>> git bisect bad 9fd3d5dced976640f588e0a866b9611db2d2cb37
>>>>>> # good: [a96d317fb1a30b9f323548eb2ff05d4e4600ead9] ethernet: use eth_hw_addr_set()
>>>>>> git bisect good a96d317fb1a30b9f323548eb2ff05d4e4600ead9
>>>>>> # good: [f5396b8a663f7a78ee5b75a47ee524b40795b265] ice: switchdev slow path
>>>>>> git bisect good f5396b8a663f7a78ee5b75a47ee524b40795b265
>>>>>> # good: [20c3d9e45ba630a7156d682a40988c0e96be1b92] hamradio: use dev_addr_set() for setting device address
>>>>>> git bisect good 20c3d9e45ba630a7156d682a40988c0e96be1b92
>>>>>> # bad: [a64b442137669c9e839c6a70965989b01b1253b7] net: dpaa2: add support for manual setup of IRQ coalesing
>>>>>> git bisect bad a64b442137669c9e839c6a70965989b01b1253b7
>>>>>> # good: [30fc7efa38f21afa48b0be6bf2053e4c10ae2c78] net, neigh: Reject creating NUD_PERMANENT with NTF_MANAGED entries
>>>>>> git bisect good 30fc7efa38f21afa48b0be6bf2053e4c10ae2c78
>>>>>> # bad: [13ad5ccc093ff448b99ac7e138e91e78796adb48] dt-bindings: net: dsa: qca8k: Document qca,sgmii-enable-pll
>>>>>> git bisect bad 13ad5ccc093ff448b99ac7e138e91e78796adb48
>>>>>> # good: [40088915f547b52635f022c1e1e18df65ae3153a] Merge branch 'octeontx2-af-miscellaneous-changes-for-cpt'
>>>>>> git bisect good 40088915f547b52635f022c1e1e18df65ae3153a
>>>>>> # bad: [fdbf35df9c091db9c46e57e9938e3f7a4f603a7c] dt-bindings: net: dsa: qca8k: Add SGMII clock phase properties
>>>>>> git bisect bad fdbf35df9c091db9c46e57e9938e3f7a4f603a7c
>>>>>> # bad: [bacc8daf97d4199316328a5d18eeafbe447143c5] xen-netback: Remove redundant initialization of variable err
>>>>>> git bisect bad bacc8daf97d4199316328a5d18eeafbe447143c5
>>>>>> # bad: [d00e60ee54b12de945b8493cf18c1ada9e422514] page_pool: disable dma mapping support for 32-bit arch with 64-bit DMA
>>>>>> git bisect bad d00e60ee54b12de945b8493cf18c1ada9e422514
>>>>>> # first bad commit: [d00e60ee54b12de945b8493cf18c1ada9e422514] page_pool: disable dma mapping support for 32-bit arch with 64-bit DMA
>>>>>> -------------------------------------------------------------------------------
>>>>>> .
>>>>>>
>>>>
>>>> .
>>>>
> .
>
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