From 3b3f1650b1ca46a4225e0bf72804779b161e27b6 Mon Sep 17 00:00:00 2001 From: Akash Goel Date: Thu, 13 Oct 2016 22:44:48 +0530 Subject: drm/i915: Allocate intel_engine_cs structure only for the enabled engines With the possibility of addition of many more number of rings in future, the drm_i915_private structure could bloat as an array, of type intel_engine_cs, is embedded inside it. struct intel_engine_cs engine[I915_NUM_ENGINES]; Though this is still fine as generally there is only a single instance of drm_i915_private structure used, but not all of the possible rings would be enabled or active on most of the platforms. Some memory can be saved by allocating intel_engine_cs structure only for the enabled/active engines. Currently the engine/ring ID is kept static and dev_priv->engine[] is simply indexed using the enums defined in intel_engine_id. To save memory and continue using the static engine/ring IDs, 'engine' is defined as an array of pointers. struct intel_engine_cs *engine[I915_NUM_ENGINES]; dev_priv->engine[engine_ID] will be NULL for disabled engine instances. There is a text size reduction of 928 bytes, from 1028200 to 1027272, for i915.o file (but for i915.ko file text size remain same as 1193131 bytes). v2: - Remove the engine iterator field added in drm_i915_private structure, instead pass a local iterator variable to the for_each_engine** macros. (Chris) - Do away with intel_engine_initialized() and instead directly use the NULL pointer check on engine pointer. (Chris) v3: - Remove for_each_engine_id() macro, as the updated macro for_each_engine() can be used in place of it. (Chris) - Protect the access to Render engine Fault register with a NULL check, as engine specific init is done later in Driver load sequence. v4: - Use !!dev_priv->engine[VCS] style for the engine check in getparam. (Chris) - Kill the superfluous init_engine_lists(). v5: - Cleanup the intel_engines_init() & intel_engines_setup(), with respect to allocation of intel_engine_cs structure. (Chris) v6: - Rebase. v7: - Optimize the for_each_engine_masked() macro. (Chris) - Change the type of 'iter' local variable to enum intel_engine_id. (Chris) - Rebase. v8: Rebase. v9: Rebase. v10: - For index calculation use engine ID instead of pointer based arithmetic in intel_engine_sync_index() as engine pointers are not contiguous now (Chris) - For appropriateness, rename local enum variable 'iter' to 'id'. (Joonas) - Use for_each_engine macro for cleanup in intel_engines_init() and remove check for NULL engine pointer in cleanup() routines. (Joonas) v11: Rebase. Cc: Chris Wilson Signed-off-by: Akash Goel Reviewed-by: Joonas Lahtinen Signed-off-by: Tvrtko Ursulin Link: http://patchwork.freedesktop.org/patch/msgid/1476378888-7372-1-git-send-email-akash.goel@intel.com --- drivers/gpu/drm/i915/intel_breadcrumbs.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'drivers/gpu/drm/i915/intel_breadcrumbs.c') diff --git a/drivers/gpu/drm/i915/intel_breadcrumbs.c b/drivers/gpu/drm/i915/intel_breadcrumbs.c index 495611b7068d..23fc1042fed4 100644 --- a/drivers/gpu/drm/i915/intel_breadcrumbs.c +++ b/drivers/gpu/drm/i915/intel_breadcrumbs.c @@ -621,6 +621,7 @@ void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine) unsigned int intel_kick_waiters(struct drm_i915_private *i915) { struct intel_engine_cs *engine; + enum intel_engine_id id; unsigned int mask = 0; /* To avoid the task_struct disappearing beneath us as we wake up @@ -628,7 +629,7 @@ unsigned int intel_kick_waiters(struct drm_i915_private *i915) * RCU lock, i.e. as we call wake_up_process() we must be holding the * rcu_read_lock(). */ - for_each_engine(engine, i915) + for_each_engine(engine, i915, id) if (unlikely(intel_engine_wakeup(engine))) mask |= intel_engine_flag(engine); @@ -638,9 +639,10 @@ unsigned int intel_kick_waiters(struct drm_i915_private *i915) unsigned int intel_kick_signalers(struct drm_i915_private *i915) { struct intel_engine_cs *engine; + enum intel_engine_id id; unsigned int mask = 0; - for_each_engine(engine, i915) { + for_each_engine(engine, i915, id) { if (unlikely(READ_ONCE(engine->breadcrumbs.first_signal))) { wake_up_process(engine->breadcrumbs.signaler); mask |= intel_engine_flag(engine); -- cgit v1.2.3-59-g8ed1b