From: Thomas Hellström thomas.hellstrom@intel.com
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@intel.com Cc: Matthew Auld matthew.auld@intel.com --- 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