Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> 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 <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_gem_request.c | 2 +-
> drivers/gpu/drm/i915/i915_gem_request.h | 1 +
> drivers/gpu/drm/i915/intel_lrc.c | 4 +++-
> 3 files changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
> index 4eb1a76731b2..14956d899911 100644
> --- a/drivers/gpu/drm/i915/i915_gem_request.c
> +++ b/drivers/gpu/drm/i915/i915_gem_request.c
> @@ -186,7 +186,7 @@ i915_priotree_init(struct i915_priotree *pt)
> INIT_LIST_HEAD(&pt->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)
> --
> 2.14.2
>
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