> -----Original Message-----
> From: Intel-gfx <intel-gfx-boun...@lists.freedesktop.org> On Behalf Of
> Thomas Hellström
> Sent: Tuesday, June 15, 2021 4:36 AM
> To: intel-...@lists.freedesktop.org; dri-devel@lists.freedesktop.org
> Cc: Thomas Hellström <thomas.hellst...@linux.intel.com>; Auld, Matthew
> <matthew.a...@intel.com>
> Subject: [Intel-gfx] [PATCH] drm/i915: Perform execbuffer object locking as a
> separate step
>
> To help avoid evicting already resident buffers from the batch we're
> processing, perform locking as a separate step.
>
> Signed-off-by: Thomas Hellström <thomas.hellst...@linux.intel.com>
> ---
> .../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)
Thomas, just checked eb_pin_vma(), it calls i915_vma_pin_ww(), if the object is
already locked, under what condition these calls still return -EDEADLK?
--CQ
> --
> 2.31.1
>
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