From e1a8daa2d159776f01d7129fae053d2d08d6c6df Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Wed, 13 Apr 2016 17:35:13 +0100 Subject: [PATCH] drm/i915: Split out !RCS legacy context switching Having the !RCS legacy context switch threaded through the RCS switching code makes it much harder to follow and understand. In the next patch, I want to fix a bug handling the incomplete switch, this is made much simpler if we segregate the two paths now. Signed-off-by: Chris Wilson Cc: Daniel Vetter Cc: Tvrtko Ursulin Reviewed-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/1460565315-7748-14-git-send-email-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_gem_context.c | 74 +++++++++++++------------ 1 file changed, 38 insertions(+), 36 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c index 453b655e86fc..c027240aacf3 100644 --- a/drivers/gpu/drm/i915/i915_gem_context.c +++ b/drivers/gpu/drm/i915/i915_gem_context.c @@ -609,9 +609,9 @@ mi_set_context(struct drm_i915_gem_request *req, u32 hw_flags) return ret; } -static inline bool should_skip_switch(struct intel_engine_cs *engine, - struct intel_context *from, - struct intel_context *to) +static inline bool skip_rcs_switch(struct intel_engine_cs *engine, + struct intel_context *from, + struct intel_context *to) { if (to->remap_slice) return false; @@ -626,15 +626,17 @@ static inline bool should_skip_switch(struct intel_engine_cs *engine, static bool needs_pd_load_pre(struct intel_engine_cs *engine, struct intel_context *to) { - struct drm_i915_private *dev_priv = engine->dev->dev_private; - if (!to->ppgtt) return false; - if (INTEL_INFO(engine->dev)->gen < 8) + if (engine->last_context == to && + !(intel_engine_flag(engine) & to->ppgtt->pd_dirty_rings)) + return false; + + if (engine->id != RCS) return true; - if (engine != &dev_priv->engine[RCS]) + if (INTEL_INFO(engine->dev)->gen < 8) return true; return false; @@ -661,32 +663,24 @@ needs_pd_load_post(struct intel_engine_cs *engine, struct intel_context *to, return false; } -static int do_switch(struct drm_i915_gem_request *req) +static int do_rcs_switch(struct drm_i915_gem_request *req) { struct intel_context *to = req->ctx; struct intel_engine_cs *engine = req->engine; - struct drm_i915_private *dev_priv = req->i915; struct intel_context *from = engine->last_context; u32 hw_flags = 0; bool uninitialized = false; int ret, i; - if (from != NULL && engine == &dev_priv->engine[RCS]) { - BUG_ON(from->legacy_hw_ctx.rcs_state == NULL); - BUG_ON(!i915_gem_obj_is_pinned(from->legacy_hw_ctx.rcs_state)); - } - - if (should_skip_switch(engine, from, to)) + if (skip_rcs_switch(engine, from, to)) return 0; /* Trying to pin first makes error handling easier. */ - if (engine == &dev_priv->engine[RCS]) { - ret = i915_gem_obj_ggtt_pin(to->legacy_hw_ctx.rcs_state, - get_context_alignment(engine->dev), - 0); - if (ret) - return ret; - } + ret = i915_gem_obj_ggtt_pin(to->legacy_hw_ctx.rcs_state, + get_context_alignment(engine->dev), + 0); + if (ret) + return ret; /* * Pin can switch back to the default context if we end up calling into @@ -709,12 +703,6 @@ static int do_switch(struct drm_i915_gem_request *req) to->ppgtt->pd_dirty_rings &= ~intel_engine_flag(engine); } - if (engine != &dev_priv->engine[RCS]) { - if (from) - i915_gem_context_unreference(from); - goto done; - } - /* * Clear this page out of any CPU caches for coherent swap-in/out. Note * that thanks to write = false in this call and us not setting any gpu @@ -802,7 +790,6 @@ static int do_switch(struct drm_i915_gem_request *req) uninitialized = !to->legacy_hw_ctx.initialized; to->legacy_hw_ctx.initialized = true; -done: i915_gem_context_reference(to); engine->last_context = to; @@ -817,8 +804,7 @@ static int do_switch(struct drm_i915_gem_request *req) return 0; unpin_out: - if (engine->id == RCS) - i915_gem_object_ggtt_unpin(to->legacy_hw_ctx.rcs_state); + i915_gem_object_ggtt_unpin(to->legacy_hw_ctx.rcs_state); return ret; } @@ -843,17 +829,33 @@ int i915_switch_context(struct drm_i915_gem_request *req) WARN_ON(i915.enable_execlists); WARN_ON(!mutex_is_locked(&dev_priv->dev->struct_mutex)); - if (req->ctx->legacy_hw_ctx.rcs_state == NULL) { /* We have the fake context */ - if (req->ctx != engine->last_context) { - i915_gem_context_reference(req->ctx); + if (engine->id != RCS || + req->ctx->legacy_hw_ctx.rcs_state == NULL) { + struct intel_context *to = req->ctx; + + if (needs_pd_load_pre(engine, to)) { + int ret; + + trace_switch_mm(engine, to); + ret = to->ppgtt->switch_mm(to->ppgtt, req); + if (ret) + return ret; + + /* Doing a PD load always reloads the page dirs */ + to->ppgtt->pd_dirty_rings &= ~intel_engine_flag(engine); + } + + if (to != engine->last_context) { + i915_gem_context_reference(to); if (engine->last_context) i915_gem_context_unreference(engine->last_context); - engine->last_context = req->ctx; + engine->last_context = to; } + return 0; } - return do_switch(req); + return do_rcs_switch(req); } static bool contexts_enabled(struct drm_device *dev) -- 2.45.2