From patchwork Wed Jun 6 06:27:02 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Wilson X-Patchwork-Id: 10449703 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 5A1096053F for ; Wed, 6 Jun 2018 06:27:50 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4AD1629834 for ; Wed, 6 Jun 2018 06:27:50 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3F7CA2984D; Wed, 6 Jun 2018 06:27:50 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id C695C29834 for ; Wed, 6 Jun 2018 06:27:49 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0530E6E564; Wed, 6 Jun 2018 06:27:48 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from fireflyinternet.com (mail.fireflyinternet.com [109.228.58.192]) by gabe.freedesktop.org (Postfix) with ESMTPS id 59E5D6E55A for ; Wed, 6 Jun 2018 06:27:44 +0000 (UTC) X-Default-Received-SPF: pass (skip=forwardok (res=PASS)) x-ip-name=78.156.65.138; Received: from haswell.alporthouse.com (unverified [78.156.65.138]) by fireflyinternet.com (Firefly Internet (M1)) with ESMTP id 11956681-1500050 for multiple; Wed, 06 Jun 2018 07:27:36 +0100 Received: by haswell.alporthouse.com (sSMTP sendmail emulation); Wed, 06 Jun 2018 07:27:38 +0100 From: Chris Wilson To: intel-gfx@lists.freedesktop.org Date: Wed, 6 Jun 2018 07:27:02 +0100 Message-Id: <20180606062710.29984-10-chris@chris-wilson.co.uk> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180606062710.29984-1-chris@chris-wilson.co.uk> References: <20180606062710.29984-1-chris@chris-wilson.co.uk> X-Originating-IP: 78.156.65.138 X-Country: code=GB country="United Kingdom" ip=78.156.65.138 Subject: [Intel-gfx] [PATCH 09/17] drm/i915/gtt: Only keep gen6 page directories pinned while active X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.23 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-Virus-Scanned: ClamAV using ClamSMTP In order to be able to evict the gen6 ppgtt, we have to unpin it at some point. We can simply use our context activity tracking to know when the ppgtt is no longer in use by hardware, and so only keep it pinned while being used a request. For the kernel_context (and thus aliasing_ppgtt), it remains pinned at all times, as the kernel_context itself is pinned at all times. Signed-off-by: Chris Wilson Cc: Joonas Lahtinen Cc: Mika Kuoppala Cc: Matthew Auld Reviewed-by: Joonas Lahtinen --- drivers/gpu/drm/i915/i915_gem_gtt.c | 36 ++++++++++++++----------- drivers/gpu/drm/i915/i915_gem_gtt.h | 5 ++++ drivers/gpu/drm/i915/intel_ringbuffer.c | 28 +++++++++++++++++++ 3 files changed, 54 insertions(+), 15 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index 28ab76684f99..6aea9caf2f24 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -1966,7 +1966,6 @@ static void gen6_ppgtt_cleanup(struct i915_address_space *vm) { struct gen6_hw_ppgtt *ppgtt = to_gen6_ppgtt(i915_vm_to_ppgtt(vm)); - i915_vma_unpin(ppgtt->vma); i915_vma_destroy(ppgtt->vma); gen6_ppgtt_free_pd(ppgtt); @@ -2060,10 +2059,19 @@ static struct i915_vma *pd_vma_create(struct gen6_hw_ppgtt *ppgtt, int size) return vma; } -static int gen6_ppgtt_pin(struct i915_hw_ppgtt *base) +int gen6_ppgtt_pin(struct i915_hw_ppgtt *base) { struct gen6_hw_ppgtt *ppgtt = to_gen6_ppgtt(base); + /* + * Workaround the limited maximum vma->pin_count and the aliasing_ppgtt + * which will be pinned into every active context. + * (When vma->pin_count becomes atomic, I expect we will naturally + * need a larger, unpacked, type and kill this redundancy.) + */ + if (ppgtt->pin_count++) + return 0; + /* * PPGTT PDEs reside in the GGTT and consists of 512 entries. The * allocator works in address space sizes, so it's multiplied by page @@ -2074,6 +2082,17 @@ static int gen6_ppgtt_pin(struct i915_hw_ppgtt *base) PIN_GLOBAL | PIN_HIGH); } +void gen6_ppgtt_unpin(struct i915_hw_ppgtt *base) +{ + struct gen6_hw_ppgtt *ppgtt = to_gen6_ppgtt(base); + + GEM_BUG_ON(!ppgtt->pin_count); + if (--ppgtt->pin_count) + return; + + i915_vma_unpin(ppgtt->vma); +} + static struct i915_hw_ppgtt *gen6_ppgtt_create(struct drm_i915_private *i915) { struct i915_ggtt * const ggtt = &i915->ggtt; @@ -2121,21 +2140,8 @@ static struct i915_hw_ppgtt *gen6_ppgtt_create(struct drm_i915_private *i915) if (err) goto err_vma; - err = gen6_ppgtt_pin(&ppgtt->base); - if (err) - goto err_pd; - - DRM_DEBUG_DRIVER("Allocated pde space (%lldM) at GTT entry: %llx\n", - ppgtt->vma->node.size >> 20, - ppgtt->vma->node.start / PAGE_SIZE); - - DRM_DEBUG_DRIVER("Adding PPGTT at offset %x\n", - ppgtt->base.pd.base.ggtt_offset << 10); - return &ppgtt->base; -err_pd: - gen6_ppgtt_free_pd(ppgtt); err_vma: i915_vma_destroy(ppgtt->vma); err_scratch: diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h index c2f270c90bea..c20a4f06db37 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.h +++ b/drivers/gpu/drm/i915/i915_gem_gtt.h @@ -413,6 +413,8 @@ struct gen6_hw_ppgtt { struct i915_vma *vma; gen6_pte_t __iomem *pd_addr; + unsigned int pin_count; + int (*switch_mm)(struct gen6_hw_ppgtt *ppgtt, struct i915_request *rq); }; @@ -627,6 +629,9 @@ static inline void i915_ppgtt_put(struct i915_hw_ppgtt *ppgtt) kref_put(&ppgtt->ref, i915_ppgtt_release); } +int gen6_ppgtt_pin(struct i915_hw_ppgtt *base); +void gen6_ppgtt_unpin(struct i915_hw_ppgtt *base); + void i915_check_and_clear_faults(struct drm_i915_private *dev_priv); void i915_gem_suspend_gtt_mappings(struct drm_i915_private *dev_priv); void i915_gem_restore_gtt_mappings(struct drm_i915_private *dev_priv); diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 7ea4660f13e1..fb8d6217b03c 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -1195,6 +1195,27 @@ static void intel_ring_context_destroy(struct intel_context *ce) __i915_gem_object_release_unless_active(ce->state->obj); } +static int __context_pin_ppgtt(struct i915_gem_context *ctx) +{ + struct i915_hw_ppgtt *ppgtt; + int err = 0; + + ppgtt = ctx->ppgtt ?: ctx->i915->mm.aliasing_ppgtt; + if (ppgtt) + err = gen6_ppgtt_pin(ppgtt); + + return err; +} + +static void __context_unpin_ppgtt(struct i915_gem_context *ctx) +{ + struct i915_hw_ppgtt *ppgtt; + + ppgtt = ctx->ppgtt ?: ctx->i915->mm.aliasing_ppgtt; + if (ppgtt) + gen6_ppgtt_unpin(ppgtt); +} + static int __context_pin(struct intel_context *ce) { struct i915_vma *vma; @@ -1243,6 +1264,7 @@ static void __context_unpin(struct intel_context *ce) static void intel_ring_context_unpin(struct intel_context *ce) { + __context_unpin_ppgtt(ce->gem_context); __context_unpin(ce); i915_gem_context_put(ce->gem_context); @@ -1340,6 +1362,10 @@ __ring_context_pin(struct intel_engine_cs *engine, if (err) goto err; + err = __context_pin_ppgtt(ce->gem_context); + if (err) + goto err_unpin; + i915_gem_context_get(ctx); /* One ringbuffer to rule them all */ @@ -1348,6 +1374,8 @@ __ring_context_pin(struct intel_engine_cs *engine, return ce; +err_unpin: + __context_unpin(ce); err: ce->pin_count = 0; return ERR_PTR(err);