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From: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
To: Maor Gottlieb <maorg@nvidia.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, David Airlie <airlied@linux.ie>,
	VMware Graphics <linux-graphics-maintainer@vmware.com>,
	Maor Gottlieb <maorg@mellanox.com>
Subject: Re: [Intel-gfx] [PATCH rdma-next v3 1/2] lib/scatterlist: Add support in dynamic allocation of SG table from pages
Date: Fri, 25 Sep 2020 14:54:38 +0100
Message-ID: <45919218-9a73-e3e3-cc03-5255a227f341@linux.intel.com> (raw)
In-Reply-To: <9d69d68d-7868-609b-c703-dfe9fec93a0f@nvidia.com>


On 25/09/2020 14:39, Maor Gottlieb wrote:
> 
> 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 
>>>>>>> b/tools/testing/scatterlist/main.c
>>>>>>> index 0a1464181226..4899359a31ac 100644
>>>>>>> +++ b/tools/testing/scatterlist/main.c
>>>>>>> @@ -55,14 +55,13 @@ int main(void)
>>>>>>>        for (i = 0, test = tests; test->expected_segments; test++, 
>>>>>>> i++) {
>>>>>>>            struct page *pages[MAX_PAGES];
>>>>>>>            struct sg_table st;
>>>>>>> -        int ret;
>>>>>>> +        struct scatterlist *sg;
>>>>>>>
>>>>>>>            set_pages(pages, test->pfn, test->num_pages);
>>>>>>>
>>>>>>> -        ret = __sg_alloc_table_from_pages(&st, pages, 
>>>>>>> test->num_pages,
>>>>>>> -                          0, test->size, test->max_seg,
>>>>>>> -                          GFP_KERNEL);
>>>>>>> -        assert(ret == test->alloc_ret);
>>>>>>> +        sg = __sg_alloc_table_from_pages(&st, pages, 
>>>>>>> test->num_pages, 0,
>>>>>>> +                test->size, test->max_seg, NULL, 0, GFP_KERNEL);
>>>>>>> +        assert(PTR_ERR_OR_ZERO(sg) == test->alloc_ret);
>>>>>> Some test coverage for relatively complex code would be very 
>>>>>> welcomed. Since
>>>>>> the testing framework is already there, even if it bit-rotted a 
>>>>>> bit, but
>>>>>> shouldn't be hard to fix.
>>>>>>
>>>>>> A few tests to check append/grow works as expected, in terms of 
>>>>>> how the end
>>>>>> table looks like given the initial state and some different page 
>>>>>> patterns
>>>>>> added to it. And both crossing and not crossing into sg chaining 
>>>>>> scenarios.
>>>>> This function is basic for all RDMA devices and we are pretty 
>>>>> 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 
>> git://people.freedesktop.org/~tursulin/drm-intel sgtest? It would be 
>> fine by me. I can clean up the commit messages if you want.
> 
> I will very appreciate it. Thanks

I've pushed a branch with tidied commit messages and a bit re-ordered to 
the same location. You can pull and include in your series:

  tools/testing/scatterlist: Rejuvenate bit-rotten test
  tools/testing/scatterlist: Show errors in human readable form

And "test fixes for sg append" you can squash (minus the sg_table 
zeroing) into your patch.

If this plan does not work for you, I can send two of my patches to lkml 
independently. What ever you prefer.

Regards,

Tvrtko

  reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-22  8:39 [PATCH rdma-next v3 0/2] Dynamicaly allocate SG table from the pages Leon Romanovsky
2020-09-22  8:39 ` [PATCH rdma-next v3 1/2] lib/scatterlist: Add support in dynamic allocation of SG table from pages Leon Romanovsky
2020-09-23  5:42   ` Christoph Hellwig
     [not found]   ` <118a03ef-d160-e202-81cc-16c9c39359fc@linux.intel.com>
2020-09-25  7:13     ` [Intel-gfx] " Leon Romanovsky
2020-09-25 11:55       ` Jason Gunthorpe
2020-09-25 12:18         ` Maor Gottlieb
2020-09-25 12:33           ` Tvrtko Ursulin
2020-09-25 13:39             ` Maor Gottlieb
2020-09-25 13:54               ` Tvrtko Ursulin [this message]
     [not found]       ` <adff5752-582c-2065-89e2-924ef732911a@linux.intel.com>
2020-09-25 11:58         ` Jason Gunthorpe
2020-09-25 12:29           ` Tvrtko Ursulin
2020-09-25 12:34             ` Jason Gunthorpe
2020-09-25 12:13         ` Maor Gottlieb
2020-09-22  8:39 ` [PATCH rdma-next v3 2/2] RDMA/umem: Move to allocate " Leon Romanovsky

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