From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C2FA2C48BCF for ; Wed, 9 Jun 2021 17:45:13 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9761B6128A for ; Wed, 9 Jun 2021 17:45:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9761B6128A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=jlekstrand.net Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8744C6EAD3; Wed, 9 Jun 2021 17:44:53 +0000 (UTC) Received: from mail-pj1-x1033.google.com (mail-pj1-x1033.google.com [IPv6:2607:f8b0:4864:20::1033]) by gabe.freedesktop.org (Postfix) with ESMTPS id 9271F6EACD for ; Wed, 9 Jun 2021 17:44:51 +0000 (UTC) Received: by mail-pj1-x1033.google.com with SMTP id 22-20020a17090a0c16b0290164a5354ad0so1884678pjs.2 for ; Wed, 09 Jun 2021 10:44:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=jlekstrand-net.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=qjGWnu7THQAtwHt74LcyjurXeKRyUvUF3ENHIniIjak=; b=KgT5unX0amLz4GTVz97s7jttwnmhavMuiNk7E9DnKuwWFAra1tLRrBUM3hwtii4ONj ZTzssdxb7xQJcYTmCgUJA9vY38QpvpNvTdutI4OFGNFRFu+x+cHnlo4n30ODJoIDWfmv RbiTcDfgSaNpmVn1ivcyH7Zg5Y+wSM8PkW9Q5knFgKcj2ZPpDngmiYy0pxz1YEDmElji iA7LQz3GwANoBSCLcqpJL2qLft5lHFiwvGqYivQivvwSQcrhtyqgA6JtBdUtD3CTa6hS iZ5MtOevpHuIPEmMtW8xKb0IglMdRWhvkD+LNvenytBGSymFhr6lHwlWC+g+SBCq5R83 nm6A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=qjGWnu7THQAtwHt74LcyjurXeKRyUvUF3ENHIniIjak=; b=JMabkZNAFqRco+g3vOYF7DHuiGb5c6eGj1L26BDxv01yoDtgyam75f0k3PSL59LXhp jZ0iisjIZY5YCzp4rxLJTxPHGOSnioFfYF2ZcEdZH3Efj51/2zQFfYNhvi0J9t1ZpbeO CoHHaac3iMfshtCq0Lo/8MI05rSX+m5X7q/lcOVyb/ySpl9pA4k6t7oI6+6LW5Vq+IpI Kx2M8IXP+XFoDjrGSEFCCxcna2HTdBJ1BcMQe0MzCc1nY4PKjsGqOlDGz/spCvrHs/hC 78mfVuzZVrV5xgcxStqG7YVgglmXW1mXyzcaLfPgKsmM2F+A2m/7UpejtoAk1vHdlG9Z X52w== X-Gm-Message-State: AOAM5334YI9Rv3bXvF9Th7GNNV9VZh64V48vpDcO/nokWKrxgztMBaZo /+aOU2MN5qliZBDruiy8qosvMSN9e0CH+g== X-Google-Smtp-Source: ABdhPJw1YkY8aWBoOcMlEdG4czYRca7MZDC9cesILvnynsUm529m85T+TksdD2eODTZRLD2XT1MVZA== X-Received: by 2002:a17:90a:de16:: with SMTP id m22mr11251534pjv.60.1623260690718; Wed, 09 Jun 2021 10:44:50 -0700 (PDT) Received: from omlet.lan (jfdmzpr04-ext.jf.intel.com. [134.134.137.73]) by smtp.gmail.com with ESMTPSA id b10sm208619pfi.122.2021.06.09.10.44.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Jun 2021 10:44:50 -0700 (PDT) From: Jason Ekstrand To: dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org Subject: [PATCH 16/31] drm/i915/gem: Add an intermediate proto_context struct (v5) Date: Wed, 9 Jun 2021 12:44:03 -0500 Message-Id: <20210609174418.249585-17-jason@jlekstrand.net> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210609174418.249585-1-jason@jlekstrand.net> References: <20210609174418.249585-1-jason@jlekstrand.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Daniel Vetter , Jason Ekstrand Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The current context uAPI allows for two methods of setting context parameters: SET_CONTEXT_PARAM and CONTEXT_CREATE_EXT_SETPARAM. The former is allowed to be called at any time while the later happens as part of GEM_CONTEXT_CREATE. Currently, everything settable via one is settable via the other. While some params are fairly simple and setting them on a live context is harmless such the context priority, others are far trickier such as the VM or the set of engines. In order to swap out the VM, for instance, we have to delay until all current in-flight work is complete, swap in the new VM, and then continue. This leads to a plethora of potential race conditions we'd really rather avoid. Unfortunately, both methods of setting the VM and the engine set are in active use today so we can't simply disallow setting the VM or engine set vial SET_CONTEXT_PARAM. In order to work around this wart, this commit adds a proto-context struct which contains all the context create parameters. v2 (Daniel Vetter): - Better commit message - Use __set/clear_bit instead of set/clear_bit because there's no race and we don't need the atomics v3 (Daniel Vetter): - Use manual bitops and BIT() instead of __set_bit v4 (Daniel Vetter): - Add a changelog to the commit message - Better hyperlinking in docs - Create the default PPGTT in i915_gem_create_context v5 (Daniel Vetter): - Hand-roll the initialization of UCONTEXT_PERSISTENCE Signed-off-by: Jason Ekstrand Reviewed-by: Daniel Vetter --- drivers/gpu/drm/i915/gem/i915_gem_context.c | 125 +++++++++++++++--- .../gpu/drm/i915/gem/i915_gem_context_types.h | 22 +++ .../gpu/drm/i915/gem/selftests/mock_context.c | 16 ++- 3 files changed, 146 insertions(+), 17 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c index f9a6eac78c0ae..f44faad296249 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c @@ -191,6 +191,84 @@ static int validate_priority(struct drm_i915_private *i915, return 0; } +static void proto_context_close(struct i915_gem_proto_context *pc) +{ + if (pc->vm) + i915_vm_put(pc->vm); + kfree(pc); +} + +static int proto_context_set_persistence(struct drm_i915_private *i915, + struct i915_gem_proto_context *pc, + bool persist) +{ + if (persist) { + /* + * Only contexts that are short-lived [that will expire or be + * reset] are allowed to survive past termination. We require + * hangcheck to ensure that the persistent requests are healthy. + */ + if (!i915->params.enable_hangcheck) + return -EINVAL; + + pc->user_flags |= BIT(UCONTEXT_PERSISTENCE); + } else { + /* To cancel a context we use "preempt-to-idle" */ + if (!(i915->caps.scheduler & I915_SCHEDULER_CAP_PREEMPTION)) + return -ENODEV; + + /* + * If the cancel fails, we then need to reset, cleanly! + * + * If the per-engine reset fails, all hope is lost! We resort + * to a full GPU reset in that unlikely case, but realistically + * if the engine could not reset, the full reset does not fare + * much better. The damage has been done. + * + * However, if we cannot reset an engine by itself, we cannot + * cleanup a hanging persistent context without causing + * colateral damage, and we should not pretend we can by + * exposing the interface. + */ + if (!intel_has_reset_engine(&i915->gt)) + return -ENODEV; + + pc->user_flags &= ~BIT(UCONTEXT_PERSISTENCE); + } + + return 0; +} + +static struct i915_gem_proto_context * +proto_context_create(struct drm_i915_private *i915, unsigned int flags) +{ + struct i915_gem_proto_context *pc, *err; + + pc = kzalloc(sizeof(*pc), GFP_KERNEL); + if (!pc) + return ERR_PTR(-ENOMEM); + + pc->user_flags = BIT(UCONTEXT_BANNABLE) | + BIT(UCONTEXT_RECOVERABLE); + if (i915->params.enable_hangcheck) + pc->user_flags |= BIT(UCONTEXT_PERSISTENCE); + pc->sched.priority = I915_PRIORITY_NORMAL; + + if (flags & I915_CONTEXT_CREATE_FLAGS_SINGLE_TIMELINE) { + if (!HAS_EXECLISTS(i915)) { + err = ERR_PTR(-EINVAL); + goto proto_close; + } + pc->single_timeline = true; + } + + return pc; + +proto_close: + proto_context_close(pc); + return err; +} + static struct i915_address_space * context_get_vm_rcu(struct i915_gem_context *ctx) { @@ -660,7 +738,8 @@ static int __context_set_persistence(struct i915_gem_context *ctx, bool state) } static struct i915_gem_context * -__create_context(struct drm_i915_private *i915) +__create_context(struct drm_i915_private *i915, + const struct i915_gem_proto_context *pc) { struct i915_gem_context *ctx; struct i915_gem_engines *e; @@ -673,7 +752,7 @@ __create_context(struct drm_i915_private *i915) kref_init(&ctx->ref); ctx->i915 = i915; - ctx->sched.priority = I915_PRIORITY_NORMAL; + ctx->sched = pc->sched; mutex_init(&ctx->mutex); INIT_LIST_HEAD(&ctx->link); @@ -696,9 +775,7 @@ __create_context(struct drm_i915_private *i915) * is no remap info, it will be a NOP. */ ctx->remap_slice = ALL_L3_SLICES(i915); - i915_gem_context_set_bannable(ctx); - i915_gem_context_set_recoverable(ctx); - __context_set_persistence(ctx, true /* cgroup hook? */); + ctx->user_flags = pc->user_flags; for (i = 0; i < ARRAY_SIZE(ctx->hang_timestamp); i++) ctx->hang_timestamp[i] = jiffies - CONTEXT_FAST_HANG_JIFFIES; @@ -786,20 +863,22 @@ static void __assign_ppgtt(struct i915_gem_context *ctx, } static struct i915_gem_context * -i915_gem_create_context(struct drm_i915_private *i915, unsigned int flags) +i915_gem_create_context(struct drm_i915_private *i915, + const struct i915_gem_proto_context *pc) { struct i915_gem_context *ctx; int ret; - if (flags & I915_CONTEXT_CREATE_FLAGS_SINGLE_TIMELINE && - !HAS_EXECLISTS(i915)) - return ERR_PTR(-EINVAL); - - ctx = __create_context(i915); + ctx = __create_context(i915, pc); if (IS_ERR(ctx)) return ctx; - if (HAS_FULL_PPGTT(i915)) { + if (pc->vm) { + /* __assign_ppgtt() requires this mutex to be held */ + mutex_lock(&ctx->mutex); + __assign_ppgtt(ctx, pc->vm); + mutex_unlock(&ctx->mutex); + } else if (HAS_FULL_PPGTT(i915)) { struct i915_ppgtt *ppgtt; ppgtt = i915_ppgtt_create(&i915->gt); @@ -810,14 +889,16 @@ i915_gem_create_context(struct drm_i915_private *i915, unsigned int flags) return ERR_CAST(ppgtt); } + /* __assign_ppgtt() requires this mutex to be held */ mutex_lock(&ctx->mutex); __assign_ppgtt(ctx, &ppgtt->vm); mutex_unlock(&ctx->mutex); + /* __assign_ppgtt() takes another reference for us */ i915_vm_put(&ppgtt->vm); } - if (flags & I915_CONTEXT_CREATE_FLAGS_SINGLE_TIMELINE) { + if (pc->single_timeline) { ret = drm_syncobj_create(&ctx->syncobj, DRM_SYNCOBJ_CREATE_SIGNALED, NULL); @@ -883,6 +964,7 @@ int i915_gem_context_open(struct drm_i915_private *i915, struct drm_file *file) { struct drm_i915_file_private *file_priv = file->driver_priv; + struct i915_gem_proto_context *pc; struct i915_gem_context *ctx; int err; u32 id; @@ -892,7 +974,14 @@ int i915_gem_context_open(struct drm_i915_private *i915, /* 0 reserved for invalid/unassigned ppgtt */ xa_init_flags(&file_priv->vm_xa, XA_FLAGS_ALLOC1); - ctx = i915_gem_create_context(i915, 0); + pc = proto_context_create(i915, 0); + if (IS_ERR(pc)) { + err = PTR_ERR(pc); + goto err; + } + + ctx = i915_gem_create_context(i915, pc); + proto_context_close(pc); if (IS_ERR(ctx)) { err = PTR_ERR(ctx); goto err; @@ -1884,6 +1973,7 @@ int i915_gem_context_create_ioctl(struct drm_device *dev, void *data, { struct drm_i915_private *i915 = to_i915(dev); struct drm_i915_gem_context_create_ext *args = data; + struct i915_gem_proto_context *pc; struct create_ext ext_data; int ret; u32 id; @@ -1906,7 +1996,12 @@ int i915_gem_context_create_ioctl(struct drm_device *dev, void *data, return -EIO; } - ext_data.ctx = i915_gem_create_context(i915, args->flags); + pc = proto_context_create(i915, args->flags); + if (IS_ERR(pc)) + return PTR_ERR(pc); + + ext_data.ctx = i915_gem_create_context(i915, pc); + proto_context_close(pc); if (IS_ERR(ext_data.ctx)) return PTR_ERR(ext_data.ctx); diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h index 5f0673a2129f9..e0bdf3e298a6a 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h @@ -66,6 +66,28 @@ struct i915_gem_engines_iter { const struct i915_gem_engines *engines; }; +/** + * struct i915_gem_proto_context - prototype context + * + * The struct i915_gem_proto_context represents the creation parameters for + * a struct i915_gem_context. This is used to gather parameters provided + * either through creation flags or via SET_CONTEXT_PARAM so that, when we + * create the final i915_gem_context, those parameters can be immutable. + */ +struct i915_gem_proto_context { + /** @vm: See &i915_gem_context.vm */ + struct i915_address_space *vm; + + /** @user_flags: See &i915_gem_context.user_flags */ + unsigned long user_flags; + + /** @sched: See &i915_gem_context.sched */ + struct i915_sched_attr sched; + + /** @single_timeline: See See &i915_gem_context.syncobj */ + bool single_timeline; +}; + /** * struct i915_gem_context - client state * diff --git a/drivers/gpu/drm/i915/gem/selftests/mock_context.c b/drivers/gpu/drm/i915/gem/selftests/mock_context.c index 51b5a3421b400..e0f512ef7f3c6 100644 --- a/drivers/gpu/drm/i915/gem/selftests/mock_context.c +++ b/drivers/gpu/drm/i915/gem/selftests/mock_context.c @@ -80,11 +80,17 @@ void mock_init_contexts(struct drm_i915_private *i915) struct i915_gem_context * live_context(struct drm_i915_private *i915, struct file *file) { + struct i915_gem_proto_context *pc; struct i915_gem_context *ctx; int err; u32 id; - ctx = i915_gem_create_context(i915, 0); + pc = proto_context_create(i915, 0); + if (IS_ERR(pc)) + return ERR_CAST(pc); + + ctx = i915_gem_create_context(i915, pc); + proto_context_close(pc); if (IS_ERR(ctx)) return ctx; @@ -142,8 +148,14 @@ struct i915_gem_context * kernel_context(struct drm_i915_private *i915) { struct i915_gem_context *ctx; + struct i915_gem_proto_context *pc; + + pc = proto_context_create(i915, 0); + if (IS_ERR(pc)) + return ERR_CAST(pc); - ctx = i915_gem_create_context(i915, 0); + ctx = i915_gem_create_context(i915, pc); + proto_context_close(pc); if (IS_ERR(ctx)) return ctx; -- 2.31.1