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Date: Tue, 12 Oct 2021 21:47:18 -0700
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From: "Dixit, Ashutosh" <ashutosh.dixit@intel.com>
In-Reply-To: <20211008065432.15482-2-zbigniew.kempczynski@intel.com>
References: <20211008065432.15482-1-zbigniew.kempczynski@intel.com>	<20211008065432.15482-2-zbigniew.kempczynski@intel.com>
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Subject: Re: [igt-dev] [PATCH i-g-t 1/7] lib/gem_submission: Add kernel exec
 object alignment capability
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To: Zbigniew =?ISO-8859-2?Q?Kempczy=F1ski?= <zbigniew.kempczynski@intel.com>
Cc: igt-dev@lists.freedesktop.org, Petri Latvala <petri.latvala@intel.com>
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On Thu, 07 Oct 2021 23:54:26 -0700, Zbigniew Kempczy=F1ski wrote:
>
> +bool gem_allows_passing_alignment(int fd)
> +{
> +	struct drm_i915_gem_exec_object2 obj =3D {
> +		.handle =3D gem_create(fd, 4096),
> +	};
> +	struct drm_i915_gem_execbuffer2 execbuf =3D {
> +		.buffers_ptr =3D to_user_pointer(&obj),
> +		.buffer_count =3D 1,
> +	};
> +	bool ret;
> +	const uint32_t bbe =3D MI_BATCH_BUFFER_END;
> +
> +	gem_write(fd, obj.handle, 0, &bbe, sizeof(bbe));
> +	gem_execbuf(fd, &execbuf);
> +
> +	obj.alignment =3D 0x2000;

8K? Shouldn't this be less than 4K?

> +	ret =3D __gem_execbuf(fd, &execbuf) =3D=3D 0;
> +	gem_close(fd, obj.handle);
> +
> +	return ret;
> +}