From: Matthew Auld <matthew.auld@xxxxxxxxx> We can't mix 64K and 4K pte's in the same page-table, so for now we align 64K objects to 2M to avoid any potential mixing. This is potentially wasteful but in reality shouldn't be too bad since this only applies to the virtual address space of a 48b PPGTT. v2: don't separate logically connected ops Suggested-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20171006145041.21673-10-matthew.auld@xxxxxxxxx Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/i915_vma.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c index 5d4164406b63..72e86b32ab41 100644 --- a/drivers/gpu/drm/i915/i915_vma.c +++ b/drivers/gpu/drm/i915/i915_vma.c @@ -503,10 +503,20 @@ i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags) */ if (upper_32_bits(end - 1) && vma->page_sizes.sg > I915_GTT_PAGE_SIZE) { + /* + * We can't mix 64K and 4K PTEs in the same page-table + * (2M block), and so to avoid the ugliness and + * complexity of coloring we opt for just aligning 64K + * objects to 2M. + */ u64 page_alignment = - rounddown_pow_of_two(vma->page_sizes.sg); + rounddown_pow_of_two(vma->page_sizes.sg | + I915_GTT_PAGE_SIZE_2M); alignment = max(alignment, page_alignment); + + if (vma->page_sizes.sg & I915_GTT_PAGE_SIZE_64K) + size = round_up(size, I915_GTT_PAGE_SIZE_2M); } ret = i915_gem_gtt_insert(vma->vm, &vma->node, -- 2.14.2 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
