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Subject: Re: [Intel-gfx] [PATCH rdma-next v3 1/2] lib/scatterlist: Add support
 in dynamic allocation of SG table from pages
To:     Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
        Jason Gunthorpe <jgg@nvidia.com>,
        Leon Romanovsky <leon@kernel.org>
CC:     Christoph Hellwig <hch@lst.de>, Doug Ledford <dledford@redhat.com>,
        <linux-rdma@vger.kernel.org>, <intel-gfx@lists.freedesktop.org>,
        "Roland Scheidegger" <sroland@vmware.com>,
        <dri-devel@lists.freedesktop.org>,
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        Maor Gottlieb <maorg@mellanox.com>
References: <20200922083958.2150803-1-leon@kernel.org>
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From:   Maor Gottlieb <maorg@nvidia.com>
Message-ID: <9d69d68d-7868-609b-c703-dfe9fec93a0f@nvidia.com>
Date:   Fri, 25 Sep 2020 16:39:53 +0300
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On 9/25/2020 3:33 PM, Tvrtko Ursulin wrote:
>
> On 25/09/2020 13:18, Maor Gottlieb wrote:
>> On 9/25/2020 2:55 PM, Jason Gunthorpe wrote:
>>> On Fri, Sep 25, 2020 at 10:13:30AM +0300, Leon Romanovsky wrote:
>>>>>> diff --git a/tools/testing/scatterlist/main.c=20
>>>>>> b/tools/testing/scatterlist/main.c
>>>>>> index 0a1464181226..4899359a31ac 100644
>>>>>> +++ b/tools/testing/scatterlist/main.c
>>>>>> @@ -55,14 +55,13 @@ int main(void)
>>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 for (i =3D 0, test =3D tests; t=
est->expected_segments; test++,=20
>>>>>> i++) {
>>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 struct =
page *pages[MAX_PAGES];
>>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 struct =
sg_table st;
>>>>>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 int ret;
>>>>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 struct scatterlist *sg;
>>>>>>
>>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 set_pag=
es(pages, test->pfn, test->num_pages);
>>>>>>
>>>>>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ret =3D __sg_alloc_table=
_from_pages(&st, pages,=20
>>>>>> test->num_pages,
>>>>>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 0, test->size, test->max_seg,
>>>>>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 GFP_KERNEL);
>>>>>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 assert(ret =3D=3D test->=
alloc_ret);
>>>>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 sg =3D __sg_alloc_table_=
from_pages(&st, pages,=20
>>>>>> test->num_pages, 0,
>>>>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 test->size, test->max_seg, NULL, 0, GFP_KERNEL);
>>>>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 assert(PTR_ERR_OR_ZERO(s=
g) =3D=3D test->alloc_ret);
>>>>> Some test coverage for relatively complex code would be very=20
>>>>> welcomed. Since
>>>>> the testing framework is already there, even if it bit-rotted a=20
>>>>> bit, but
>>>>> shouldn't be hard to fix.
>>>>>
>>>>> A few tests to check append/grow works as expected, in terms of=20
>>>>> how the end
>>>>> table looks like given the initial state and some different page=20
>>>>> patterns
>>>>> added to it. And both crossing and not crossing into sg chaining=20
>>>>> scenarios.
>>>> This function is basic for all RDMA devices and we are pretty=20
>>>> confident
>>>> that the old and new flows are tested thoroughly.
>>> Well, since 0-day is reporting that __i915_gem_userptr_alloc_pages is
>>> crashing on this, it probably does need some tests :\
>>>
>>> Jason
>>
>> It is crashing in the regular old flow which already tested.
>> However, I will add more tests.
>
> Do you want to take some of the commits from=20
> git://people.freedesktop.org/~tursulin/drm-intel sgtest? It would be=20
> fine by me. I can clean up the commit messages if you want.

I will very appreciate it. Thanks
>
> https://cgit.freedesktop.org/~tursulin/drm-intel/commit/?h=3Dsgtest&id=3D=
79102f4d795c4769431fc44a6cf7ed5c5b1b5214=20
> - this one undoes the bit rot and makes the test just work on the=20
> current kernel.
>
> https://cgit.freedesktop.org/~tursulin/drm-intel/commit/?h=3Dsgtest&id=3D=
b09bfe80486c4d93ee1d8ae17d5b46397b1c6ee1=20
> - this one you probably should squash in your patch. Minus the zeroing=20
> of struct sg_stable since that would hide the issue.
>
> https://cgit.freedesktop.org/~tursulin/drm-intel/commit/?h=3Dsgtest&id=3D=
97f5df37e612f798ced90541eece13e2ef639181=20
> - final commit is optional but I guess handy for debugging.
>
> Regards,
>
> Tvrtko

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Subject: Re: [Intel-gfx] [PATCH rdma-next v3 1/2] lib/scatterlist: Add support
 in dynamic allocation of SG table from pages
To: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>, Jason Gunthorpe
 <jgg@nvidia.com>, Leon Romanovsky <leon@kernel.org>
References: <20200922083958.2150803-1-leon@kernel.org>
 <20200922083958.2150803-2-leon@kernel.org>
 <118a03ef-d160-e202-81cc-16c9c39359fc@linux.intel.com>
 <20200925071330.GA2280698@unreal> <20200925115544.GY9475@nvidia.com>
 <65ca566b-7a5e-620f-13a4-c59eb836345a@nvidia.com>
 <33942b10-8eef-9180-44c5-b7379b92b824@linux.intel.com>
From: Maor Gottlieb <maorg@nvidia.com>
Message-ID: <9d69d68d-7868-609b-c703-dfe9fec93a0f@nvidia.com>
Date: Fri, 25 Sep 2020 16:39:53 +0300
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