linux-kernel - Re: [Intel-gfx] [PATCH v5 4/5] drm/i915: add gtt misalignment test

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Message-ID: <b6e9a900-435f-148c-826f-a8f6c188df94@shipmail.org>
Date:   Wed, 26 Jan 2022 15:05:44 +0100
From:   Thomas Hellström (Intel) 
        <thomas_os@...pmail.org>
To:     Robert Beckett <bob.beckett@...labora.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [Intel-gfx] [PATCH v5 4/5] drm/i915: add gtt misalignment test


On 1/25/22 20:35, Robert Beckett wrote:
> add test to check handling of misaligned offsets and sizes
>
> v4:
> 	* remove spurious blank lines
> 	* explicitly cast intel_region_id to intel_memory_type in misaligned_pin
> Reported-by: kernel test robot <lkp@...el.com>
>
> Signed-off-by: Robert Beckett <bob.beckett@...labora.com>
> ---
>   drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 128 ++++++++++++++++++
>   1 file changed, 128 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
> index b80788a2b7f9..f082b5ff3b5e 100644
> --- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
> @@ -22,10 +22,12 @@
>    *
>    */
>   
> +#include "gt/intel_gtt.h"
>   #include <linux/list_sort.h>
>   #include <linux/prime_numbers.h>
>   
>   #include "gem/i915_gem_context.h"
> +#include "gem/i915_gem_region.h"
>   #include "gem/selftests/mock_context.h"
>   #include "gt/intel_context.h"
>   #include "gt/intel_gpu_commands.h"
> @@ -1067,6 +1069,120 @@ static int shrink_boom(struct i915_address_space *vm,
>   	return err;
>   }
>   
> +static int misaligned_case(struct i915_address_space *vm, struct intel_memory_region *mr,
> +			   u64 addr, u64 size, unsigned long flags)
> +{
> +	struct drm_i915_gem_object *obj;
> +	struct i915_vma *vma;
> +	int err = 0;
> +	u64 expected_vma_size, expected_node_size;
> +
> +	obj = i915_gem_object_create_region(mr, size, 0, 0);
> +	if (IS_ERR(obj))
> +		return PTR_ERR(obj);
> +
> +	vma = i915_vma_instance(obj, vm, NULL);
> +	if (IS_ERR(vma)) {
> +		err = PTR_ERR(vma);
> +		goto err_put;
> +	}
> +
> +	err = i915_vma_pin(vma, 0, 0, addr | flags);
> +	if (err)
> +		goto err_put;
> +	i915_vma_unpin(vma);
> +
> +	if (!drm_mm_node_allocated(&vma->node)) {
> +		err = -EINVAL;
> +		goto err_put;
> +	}
> +
> +	if (i915_vma_misplaced(vma, 0, 0, addr | flags)) {
> +		err = -EINVAL;
> +		goto err_put;
> +	}
> +
> +	expected_vma_size = round_up(size, 1 << (ffs(vma->resource->page_sizes_gtt) - 1));
> +	expected_node_size = expected_vma_size;
> +
> +	if (IS_DG2(vm->i915) && i915_gem_object_is_lmem(obj)) {
> +		/* dg2 should expand lmem node to 2MB */

Should this test be NEEDS_COMPACT_PT()?

Otherwise LGTM. Reviewed-by: Thomas Hellström 
<thomas.hellstrom@...ux.intel.com>