On 2021-06-15 at 13:36:00 +0200, Thomas Hellström wrote:
> To help avoid evicting already resident buffers from the batch we're
> processing, perform locking as a separate step.
>
Looks reasonable to me.
Reviewed-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
> Signed-off-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
> ---
> .../gpu/drm/i915/gem/i915_gem_execbuffer.c | 25 ++++++++++++++++---
> 1 file changed, 21 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> index 201fed19d120..394eb40c95b5 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> @@ -922,21 +922,38 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
> return err;
> }
>
> -static int eb_validate_vmas(struct i915_execbuffer *eb)
> +static int eb_lock_vmas(struct i915_execbuffer *eb)
> {
> unsigned int i;
> int err;
>
> - INIT_LIST_HEAD(&eb->unbound);
> -
> for (i = 0; i < eb->buffer_count; i++) {
> - struct drm_i915_gem_exec_object2 *entry = &eb->exec[i];
> struct eb_vma *ev = &eb->vma[i];
> struct i915_vma *vma = ev->vma;
>
> err = i915_gem_object_lock(vma->obj, &eb->ww);
> if (err)
> return err;
> + }
> +
> + return 0;
> +}
> +
> +static int eb_validate_vmas(struct i915_execbuffer *eb)
> +{
> + unsigned int i;
> + int err;
> +
> + INIT_LIST_HEAD(&eb->unbound);
> +
> + err = eb_lock_vmas(eb);
> + if (err)
> + return err;
> +
> + for (i = 0; i < eb->buffer_count; i++) {
> + struct drm_i915_gem_exec_object2 *entry = &eb->exec[i];
> + struct eb_vma *ev = &eb->vma[i];
> + struct i915_vma *vma = ev->vma;
>
> err = eb_pin_vma(eb, entry, ev);
> if (err == -EDEADLK)
> --
> 2.31.1
>
