On ke, 2017-01-11 at 21:09 +0000, Chris Wilson wrote:
> Exercise filling different pages of the GTT
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
<SNIP>
> +static int walk_hole(struct drm_i915_private *i915,
> > + struct i915_address_space *vm,
> > + u64 hole_start, u64 hole_end)
> +{
<SNIP>
> + for (addr = hole_start; addr < hole_end; addr += PAGE_SIZE)
{
> + cond_resched();
Maybe this should be in the previous tests too that fill the GTT (one
would imagine it to take a lot longer than just walking with single
vma).
> +static int igt_ppgtt_walk(void *arg)
> +{
<SNIP>
> +
> + i915_ppgtt_close(&ppgtt->base);
> + i915_ppgtt_put(ppgtt);
> +err_unlock:
traditionally called out_unlock; Or being sole label, just out:
> + mutex_unlock(&dev_priv->drm.struct_mutex);
> +
> + fake_file_free(dev_priv, file);
> + return err;
> +}
> +
<SNIP>
> +static int igt_ggtt_walk(void *arg)
> +{
> + struct drm_i915_private *i915 = arg;
> + struct i915_ggtt *ggtt = &i915->ggtt;
> + u64 hole_start = U64_MAX, hole_end = 0, hole_size = 0;
I think I missed this in the ppgtt, but; single assignment per line as
per CodingStyle. This is not obfuscation contest.
> + u64 this_start, this_end;
> + struct drm_mm_node *node;
> + int err;
> +
> + GEM_BUG_ON(ggtt->base.total & ~PAGE_MASK);
I think single instance of this somewhere early should be enough?
> +
> + mutex_lock(&i915->drm.struct_mutex);
> + drm_mm_for_each_hole(node, &ggtt->base.mm, this_start, this_end) {
> + u64 this_size;
> +
> + if (ggtt->base.mm.color_adjust)
> + ggtt->base. mm.color_adjust(node, 0,
> + &this_start, &this_end);
> +
> + this_size = this_end - this_start;
> + if (this_size > hole_size) {
> + hole_size = this_size;
> + hole_start = this_start;
> + hole_end = this_end;
> + }
> + }
> + pr_info("Found GGTT hole [%llx, %llx], size %llx\n",
> + hole_start, hole_end, hole_size);
> + GEM_BUG_ON(hole_start >= hole_end);
> +
Why not just walk all the holes big enough to accommodate GTT_PAGE_SIZE
for better coverage? But for just one hole, with above;
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Regards, Joonas
--
Joonas Lahtinen
Open Source Technology Center
Intel Corporation
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