Re: [igt-dev] [PATCH i-g-t 1/5] lib/i915: Assert mmap size alignment

From: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
To: Chris Wilson <chris@chris-wilson.co.uk>, igt-dev@lists.freedesktop.org
Cc: Intel-gfx@lists.freedesktop.org,
	Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Subject: Re: [igt-dev] [PATCH i-g-t 1/5] lib/i915: Assert mmap size alignment
Date: Thu, 28 Feb 2019 14:38:35 +0000	[thread overview]
Message-ID: <3fd4d69d-1602-adb5-849f-0dfe69f9bdaa@linux.intel.com> (raw)
In-Reply-To: <155136384674.5847.8337599553118358763@skylake-alporthouse-com>

On 28/02/2019 14:24, Chris Wilson wrote:
> Quoting Tvrtko Ursulin (2019-02-28 14:18:24)
>> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
>>
>> mmap(2) mandates size is page aligned so check this in our wrappers.
>>
>> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
>> ---
>>   lib/i915/gem_mman.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/lib/i915/gem_mman.c b/lib/i915/gem_mman.c
>> index 3cf9a6bbdb31..084dbb3b3678 100644
>> --- a/lib/i915/gem_mman.c
>> +++ b/lib/i915/gem_mman.c
>> @@ -57,6 +57,8 @@ void *__gem_mmap__gtt(int fd, uint32_t handle, uint64_t size, unsigned prot)
>>          struct drm_i915_gem_mmap_gtt mmap_arg;
>>          void *ptr;
>>   
>> +       igt_assert(!(size & 4095));
> 
> No, we don't filter what the kernel gets, not in the ioctl wrapper
> itself.

I know, but I could flip a coin on these kind of decisions. (Sometimes 
we open code for such ABI tests.) Move it to non-double underscore flavours?

Regards,

Tvrtko

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