From 7d1ea609f67a7d17c287ffdc008c79e0e91bc581 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 28 Sep 2017 20:39:00 +0100 Subject: [PATCH] drm/i915: Give the invalid priority a magic name We use INT_MIN to denote the priority of a request that has not been submitted to the scheduler; we treat INT_MIN as an invalid priority and initialise the request to it. Give the value a name so it stands out. Signed-off-by: Chris Wilson Cc: Joonas Lahtinen Link: https://patchwork.freedesktop.org/patch/msgid/20170928193910.17988-3-chris@chris-wilson.co.uk Reviewed-by: Mika Kuoppala Reviewed-by: Joonas Lahtinen signalers_list); INIT_LIST_HEAD(&pt->waiters_list); INIT_LIST_HEAD(&pt->link); - pt->priority = INT_MIN; + pt->priority = I915_PRIORITY_INVALID; } static int reset_all_global_seqno(struct drm_i915_private *i915, u32 seqno) diff --git a/drivers/gpu/drm/i915/i915_gem_request.h b/drivers/gpu/drm/i915/i915_gem_request.h index 96eb52471dad..6b9e992d01de 100644 --- a/drivers/gpu/drm/i915/i915_gem_request.h +++ b/drivers/gpu/drm/i915/i915_gem_request.h @@ -72,6 +72,7 @@ struct i915_priotree { #define I915_PRIORITY_MAX 1024 #define I915_PRIORITY_NORMAL 0 #define I915_PRIORITY_MIN (-I915_PRIORITY_MAX) +#define I915_PRIORITY_INVALID INT_MIN }; struct i915_gem_capture_list { diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index cbac2fff8e4d..303bb2c0b3ce 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -863,6 +863,8 @@ static void execlists_schedule(struct drm_i915_gem_request *request, int prio) struct i915_dependency stack; LIST_HEAD(dfs); + GEM_BUG_ON(prio == I915_PRIORITY_INVALID); + if (prio <= READ_ONCE(request->priotree.priority)) return; @@ -911,7 +913,7 @@ static void execlists_schedule(struct drm_i915_gem_request *request, int prio) * execlists_submit_request()), we can set our own priority and skip * acquiring the engine locks. */ - if (request->priotree.priority == INT_MIN) { + if (request->priotree.priority == I915_PRIORITY_INVALID) { GEM_BUG_ON(!list_empty(&request->priotree.link)); request->priotree.priority = prio; if (stack.dfs_link.next == stack.dfs_link.prev) -- 2.11.0