From patchwork Tue Oct 20 09:23:53 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nick Hoath X-Patchwork-Id: 7445231 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id E80AABEEA4 for ; Tue, 20 Oct 2015 09:28:08 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9F55B20826 for ; Tue, 20 Oct 2015 09:28:07 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 504AD20846 for ; Tue, 20 Oct 2015 09:28:06 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 3EC7572166; Tue, 20 Oct 2015 02:28:05 -0700 (PDT) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by gabe.freedesktop.org (Postfix) with ESMTP id 52D926E78C for ; Tue, 20 Oct 2015 02:28:04 -0700 (PDT) Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga103.fm.intel.com with ESMTP; 20 Oct 2015 02:28:04 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.17,706,1437462000"; d="scan'208";a="815078795" Received: from nthoath-linux2.isw.intel.com ([10.102.226.45]) by fmsmga001.fm.intel.com with ESMTP; 20 Oct 2015 02:24:06 -0700 From: Nick Hoath To: intel-gfx@lists.freedesktop.org Date: Tue, 20 Oct 2015 10:23:53 +0100 Message-Id: <1445333036-22164-4-git-send-email-nicholas.hoath@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1445333036-22164-1-git-send-email-nicholas.hoath@intel.com> References: <1445333036-22164-1-git-send-email-nicholas.hoath@intel.com> Cc: Daniel Vetter Subject: [Intel-gfx] [PATCH 3/6] drm/i915: Unify execlist and legacy request life-cycles X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP There is a desire to simplify the i915 driver by reducing the number of different code paths introduced by the LRC / execlists support. As the execlists request is now part of the gem request it is possible and desirable to unify the request life-cycles for execlist and legacy requests. A request is considered retireable if its seqno passed (i.e. the request has completed) and either it was never submitted to the ELSP or its context completed. This ensures that context save is carried out before the last request for a context is considered retireable. request_complete() now checks the elsp_submitted count when deciding if a request is complete. Requests that were not waiting for a context switch interrupt (either as a result of being merged into a following request or by being a legacy request) will be considered retireable as soon as their seqno has passed. Removed the extra request reference held for the execlist request. Removed intel_execlists_retire_requests() and all references to intel_engine_cs.execlist_retired_req_list. Changed gen8_cs_irq_handler() so that notify_ring() is called when contexts complete as well as when a user interrupt occurs so that notification happens when a request is complete and context save has finished. v2: Rebase over the read-read optimisation changes v3: Reworked IRQ handler after removing IRQ handler cleanup patch v4: Fixed various pin leaks v5: Removed ctx_complete flag & associated changes. Removed extraneous request pin of context. (Chris Wilson/Daniel Vetter) Issue: VIZ-4277 Signed-off-by: Thomas Daniel Signed-off-by: Nick Hoath Cc: Daniel Vetter Cc: Chris Wilson --- drivers/gpu/drm/i915/i915_drv.h | 2 +- drivers/gpu/drm/i915/i915_gem.c | 23 ++++++++--------- drivers/gpu/drm/i915/i915_irq.c | 7 ++--- drivers/gpu/drm/i915/intel_lrc.c | 45 ++++----------------------------- drivers/gpu/drm/i915/intel_lrc.h | 2 +- drivers/gpu/drm/i915/intel_ringbuffer.h | 1 - 6 files changed, 21 insertions(+), 59 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 8afda45..ae08e57 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -2914,7 +2914,7 @@ static inline bool i915_gem_request_completed(struct drm_i915_gem_request *req, seqno = req->ring->get_seqno(req->ring, lazy_coherency); - return i915_seqno_passed(seqno, req->seqno); + return i915_seqno_passed(seqno, req->seqno) && !req->elsp_submitted; } int __must_check i915_gem_get_seqno(struct drm_device *dev, u32 *seqno); diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index e57061a..290a1ac 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -2848,12 +2848,16 @@ i915_gem_retire_requests_ring(struct intel_engine_cs *ring) if (!list_empty(&obj->last_read_req[ring->id]->list)) break; + if (!i915_gem_request_completed(obj->last_read_req[ring->id], + true)) + break; i915_gem_object_retire__read(obj, ring->id); } if (unlikely(ring->trace_irq_req && - i915_gem_request_completed(ring->trace_irq_req, true))) { + i915_gem_request_completed(ring->trace_irq_req, + true))) { ring->irq_put(ring); i915_gem_request_assign(&ring->trace_irq_req, NULL); } @@ -2872,15 +2876,6 @@ i915_gem_retire_requests(struct drm_device *dev) for_each_ring(ring, dev_priv, i) { i915_gem_retire_requests_ring(ring); idle &= list_empty(&ring->request_list); - if (i915.enable_execlists) { - unsigned long flags; - - spin_lock_irqsave(&ring->execlist_lock, flags); - idle &= list_empty(&ring->execlist_queue); - spin_unlock_irqrestore(&ring->execlist_lock, flags); - - intel_execlists_retire_requests(ring); - } } if (idle) @@ -2956,12 +2951,14 @@ i915_gem_object_flush_active(struct drm_i915_gem_object *obj) if (req == NULL) continue; - if (list_empty(&req->list)) - goto retire; + if (list_empty(&req->list)) { + if (i915_gem_request_completed(req, true)) + i915_gem_object_retire__read(obj, i); + continue; + } if (i915_gem_request_completed(req, true)) { __i915_gem_request_retire__upto(req); -retire: i915_gem_object_retire__read(obj, i); } } diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index 7837f5e..86a6662 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -1294,10 +1294,11 @@ static __always_inline void gen8_cs_irq_handler(struct intel_engine_cs *ring, u32 iir, int test_shift) { - if (iir & (GT_RENDER_USER_INTERRUPT << test_shift)) - notify_ring(ring); + bool need_notify = false; if (iir & (GT_CONTEXT_SWITCH_INTERRUPT << test_shift)) - intel_lrc_irq_handler(ring); + need_notify = intel_lrc_irq_handler(ring); + if ((iir & (GT_RENDER_USER_INTERRUPT << test_shift)) || need_notify) + notify_ring(ring); } static irqreturn_t gen8_gt_irq_handler(struct drm_i915_private *dev_priv, diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index 88e12bd..8428ebd 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -426,9 +426,8 @@ static void execlists_context_unqueue(struct intel_engine_cs *ring) /* Same ctx: ignore first request, as second request * will update tail past first request's workload */ cursor->elsp_submitted = req0->elsp_submitted; + req0->elsp_submitted = 0; list_del(&req0->execlist_link); - list_add_tail(&req0->execlist_link, - &ring->execlist_retired_req_list); req0 = cursor; } else { req1 = cursor; @@ -478,11 +477,8 @@ static bool execlists_check_remove_request(struct intel_engine_cs *ring, if (intel_execlists_ctx_id(ctx_obj) == request_id) { WARN(head_req->elsp_submitted == 0, "Never submitted head request\n"); - if (--head_req->elsp_submitted <= 0) { list_del(&head_req->execlist_link); - list_add_tail(&head_req->execlist_link, - &ring->execlist_retired_req_list); return true; } } @@ -497,8 +493,9 @@ static bool execlists_check_remove_request(struct intel_engine_cs *ring, * * Check the unread Context Status Buffers and manage the submission of new * contexts to the ELSP accordingly. + * @return whether a context completed */ -void intel_lrc_irq_handler(struct intel_engine_cs *ring) +bool intel_lrc_irq_handler(struct intel_engine_cs *ring) { struct drm_i915_private *dev_priv = ring->dev->dev_private; u32 status_pointer; @@ -558,6 +555,8 @@ void intel_lrc_irq_handler(struct intel_engine_cs *ring) _MASKED_FIELD(GEN8_CSB_PTR_MASK << 8, ((u32)ring->next_context_status_buffer & GEN8_CSB_PTR_MASK) << 8)); + + return (submit_contexts != 0); } static int execlists_context_queue(struct drm_i915_gem_request *request) @@ -566,11 +565,6 @@ static int execlists_context_queue(struct drm_i915_gem_request *request) struct drm_i915_gem_request *cursor; int num_elements = 0; - if (request->ctx != ring->default_context) - intel_lr_context_pin(request); - - i915_gem_request_reference(request); - spin_lock_irq(&ring->execlist_lock); list_for_each_entry(cursor, &ring->execlist_queue, execlist_link) @@ -588,8 +582,6 @@ static int execlists_context_queue(struct drm_i915_gem_request *request) WARN(tail_req->elsp_submitted != 0, "More than 2 already-submitted reqs queued\n"); list_del(&tail_req->execlist_link); - list_add_tail(&tail_req->execlist_link, - &ring->execlist_retired_req_list); } } @@ -943,32 +935,6 @@ int intel_execlists_submission(struct i915_execbuffer_params *params, return 0; } -void intel_execlists_retire_requests(struct intel_engine_cs *ring) -{ - struct drm_i915_gem_request *req, *tmp; - struct list_head retired_list; - - WARN_ON(!mutex_is_locked(&ring->dev->struct_mutex)); - if (list_empty(&ring->execlist_retired_req_list)) - return; - - INIT_LIST_HEAD(&retired_list); - spin_lock_irq(&ring->execlist_lock); - list_replace_init(&ring->execlist_retired_req_list, &retired_list); - spin_unlock_irq(&ring->execlist_lock); - - list_for_each_entry_safe(req, tmp, &retired_list, execlist_link) { - struct intel_context *ctx = req->ctx; - struct drm_i915_gem_object *ctx_obj = - ctx->engine[ring->id].state; - - if (ctx_obj && (ctx != ring->default_context)) - intel_lr_context_unpin(req); - list_del(&req->execlist_link); - i915_gem_request_unreference(req); - } -} - void intel_logical_ring_stop(struct intel_engine_cs *ring) { struct drm_i915_private *dev_priv = ring->dev->dev_private; @@ -1924,7 +1890,6 @@ static int logical_ring_init(struct drm_device *dev, struct intel_engine_cs *rin init_waitqueue_head(&ring->irq_queue); INIT_LIST_HEAD(&ring->execlist_queue); - INIT_LIST_HEAD(&ring->execlist_retired_req_list); spin_lock_init(&ring->execlist_lock); ret = i915_cmd_parser_init_ring(ring); diff --git a/drivers/gpu/drm/i915/intel_lrc.h b/drivers/gpu/drm/i915/intel_lrc.h index 4e60d54..e6a4900 100644 --- a/drivers/gpu/drm/i915/intel_lrc.h +++ b/drivers/gpu/drm/i915/intel_lrc.h @@ -95,7 +95,7 @@ int intel_execlists_submission(struct i915_execbuffer_params *params, struct list_head *vmas); u32 intel_execlists_ctx_id(struct drm_i915_gem_object *ctx_obj); -void intel_lrc_irq_handler(struct intel_engine_cs *ring); +bool intel_lrc_irq_handler(struct intel_engine_cs *ring); void intel_execlists_retire_requests(struct intel_engine_cs *ring); #endif /* _INTEL_LRC_H_ */ diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h index 49fa41d..d99b167 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.h +++ b/drivers/gpu/drm/i915/intel_ringbuffer.h @@ -264,7 +264,6 @@ struct intel_engine_cs { /* Execlists */ spinlock_t execlist_lock; struct list_head execlist_queue; - struct list_head execlist_retired_req_list; u8 next_context_status_buffer; u32 irq_keep_mask; /* bitmask for interrupts that should not be masked */ int (*emit_request)(struct drm_i915_gem_request *request);