Op 15-06-2021 om 15:14 schreef Thomas Hellström:
> Introduce a for_i915_gem_ww(){} utility to help make the code
> around a ww transaction more readable.
>
> Signed-off-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
> Reviewed-by: Matthew Auld <matthew.auld@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_gem_ww.h | 31 +++++++++++++++++++++++++++++-
> 1 file changed, 30 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_ww.h b/drivers/gpu/drm/i915/i915_gem_ww.h
> index f2d8769e4118..f6b1a796667b 100644
> --- a/drivers/gpu/drm/i915/i915_gem_ww.h
> +++ b/drivers/gpu/drm/i915/i915_gem_ww.h
> @@ -11,11 +11,40 @@ struct i915_gem_ww_ctx {
> struct ww_acquire_ctx ctx;
> struct list_head obj_list;
> struct drm_i915_gem_object *contended;
> - bool intr;
> + unsigned short intr;
> + unsigned short loop;
> };
>
> void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ctx, bool intr);
> void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ctx);
> int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ctx);
> void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj);
> +
> +/* Internal functions used by the inlines! Don't use. */
> +static inline int __i915_gem_ww_fini(struct i915_gem_ww_ctx *ww, int err)
> +{
> + ww->loop = 0;
> + if (err == -EDEADLK) {
> + err = i915_gem_ww_ctx_backoff(ww);
> + if (!err)
> + ww->loop = 1;
> + }
> +
> + if (!ww->loop)
> + i915_gem_ww_ctx_fini(ww);
> +
> + return err;
> +}
> +
> +static inline void
> +__i915_gem_ww_init(struct i915_gem_ww_ctx *ww, bool intr)
> +{
> + i915_gem_ww_ctx_init(ww, intr);
> + ww->loop = 1;
> +}
> +
> +#define for_i915_gem_ww(_ww, _err, _intr) \
> + for (__i915_gem_ww_init(_ww, _intr); (_ww)->loop; \
> + _err = __i915_gem_ww_fini(_ww, _err))
> +
> #endif
With some more macro abuse, we should be able to kill off ww->loop,
for (err = ({i915_gem_ww_ctx_init(ww, intr), -EDEADLK}); err == -EDEADLK; err = (err == -EDEADLK && !(err = i915_gem_ww_ctx_backoff(ww))) ? -EDEADLK : err)
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