From patchwork Sat Jul 10 21:24:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Ekstrand X-Patchwork-Id: 12368879 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=-16.8 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,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 091A7C07E9B for ; Sat, 10 Jul 2021 21:26:49 +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 AB6D46135B for ; Sat, 10 Jul 2021 21:26:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AB6D46135B 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 18B536EB65; Sat, 10 Jul 2021 21:26:42 +0000 (UTC) Received: from mail-ot1-x330.google.com (mail-ot1-x330.google.com [IPv6:2607:f8b0:4864:20::330]) by gabe.freedesktop.org (Postfix) with ESMTPS id 92AF66EB63 for ; Sat, 10 Jul 2021 21:26:39 +0000 (UTC) Received: by mail-ot1-x330.google.com with SMTP id i12-20020a05683033ecb02903346fa0f74dso13676478otu.10 for ; Sat, 10 Jul 2021 14:26:39 -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=NaZZyfwePxiEZkEb5ZSYisIkekSPvEcFee5QuNg1gBQ=; b=eBYS37VRLSFrOEsvajH4C2QctUznJRROu6upoTh3/P1JN0ziVx8E7DrvICkmbuU5yV eummayUJV2S2O4Cm2GeSNDrFRoq7kjtJ08okssRyxLHY60x4FJny+LRyx3pM0fxHXg+z FN0742KaQxrgjBmanh8jI9zP4VI8ilV8MoiNb0qKl9/1sZ2hcsVO7ODyoSrVIZxvgemC t92Ax/wkV17NILBj5Pk8jb/1HmlaXxuHim4tUs0GGochTZSRQERwIx5k3QjUcS30xHu7 plQe66lxAsmCQEjdcviXhmi5TIjzAFtUYUn9sXKTn/sLpTSjK8Xxyf+AEiE4nNQ2fKoM iqoA== 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=NaZZyfwePxiEZkEb5ZSYisIkekSPvEcFee5QuNg1gBQ=; b=jyI1beVRPUtViyF6ELXKm7DT+oD//zfbE65d9Pb176UH1QZOMFgmBzA8bZ8OfHZ1tc dG077TmDIn077r6u78ViHjcZ9TSnwG85cH3a9I6udHLm49SHrOhliEilqFiGXwu9poUu I+6j01h8+YObG8TEv0XtOPF+eNI6T8KLHero3BOjkFwBxV8WwOf0Y4a+jKzgqbVTEhE3 1+55Soiu3PPPLQ+vrxlDIgLS+kQXLnprtRC9FKO85yL2QVt/fQ0QG1mzu1U693oFR6AJ xlPjxZgy4DWsdhteJroErHgVKjrY9EzgpId6jyrwifzC38ICc28hn6YX0kszVbfEAx5y anMg== X-Gm-Message-State: AOAM530iv8fyfHFIqMErzrqiLok5vXdcEeLdeV4C1/amseaxJQaQNb7L dqVukX+ltv6aZvZU6dJvZpIPlw== X-Google-Smtp-Source: ABdhPJxG8bSY8jyyuCxz542abC/u5CeDMpxONyHV/26q4pLBfSPEt77O7fl/GHGAMcRWK0b/+rdvyw== X-Received: by 2002:a05:6830:34a2:: with SMTP id c34mr34198395otu.59.1625952398789; Sat, 10 Jul 2021 14:26:38 -0700 (PDT) Received: from omlet.lan ([68.203.99.148]) by smtp.gmail.com with ESMTPSA id u18sm972797ooq.36.2021.07.10.14.26.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 10 Jul 2021 14:26:38 -0700 (PDT) From: Jason Ekstrand To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH 2/2] drm/i915/uapi: Add docs about immutability of engine sets and VMs Date: Sat, 10 Jul 2021 16:24:47 -0500 Message-Id: <20210710212447.785288-3-jason@jlekstrand.net> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210710212447.785288-1-jason@jlekstrand.net> References: <20210710212447.785288-1-jason@jlekstrand.net> MIME-Version: 1.0 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" Signed-off-by: Jason Ekstrand Cc: Daniel Vetter --- include/uapi/drm/i915_drm.h | 39 ++++++++++++++++++++++++++----------- 1 file changed, 28 insertions(+), 11 deletions(-) diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h index e334a8b14ef2d..b6bfbda1258c8 100644 --- a/include/uapi/drm/i915_drm.h +++ b/include/uapi/drm/i915_drm.h @@ -1676,15 +1676,25 @@ struct drm_i915_gem_context_param { */ #define I915_CONTEXT_PARAM_RECOVERABLE 0x8 - /* - * The id of the associated virtual memory address space (ppGTT) of - * this context. Can be retrieved and passed to another context - * (on the same fd) for both to use the same ppGTT and so share - * address layouts, and avoid reloading the page tables on context - * switches between themselves. - * - * See DRM_I915_GEM_VM_CREATE and DRM_I915_GEM_VM_DESTROY. - */ +/* + * The id of the associated virtual memory address space (ppGTT) of + * this context. Can be retrieved and passed to another context + * (on the same fd) for both to use the same ppGTT and so share + * address layouts, and avoid reloading the page tables on context + * switches between themselves. + * + * The VM id should only be set via I915_CONTEXT_CREATE_EXT_SETPARAM. + * + * On GPUs with graphics version 12 and earlier, it may also be set via + * DRM_IOCTL_I915_GEM_CONTEXT_SETPARAM. However, this is only for + * backwards compatibility with old userspace and should be considered + * deprecated. Starting with graphics version 13, it can only be set via + * I915_CONTEXT_CREATE_EXT_SETPARAM. When using setparam, it may only be + * set once for each context and, once the context has been used with any + * ioctl other than I915_CONTEXT_CREATE_EXT_SETPARAM, it may not be set. + * + * See DRM_I915_GEM_VM_CREATE and DRM_I915_GEM_VM_DESTROY. + */ #define I915_CONTEXT_PARAM_VM 0x9 /* @@ -1700,8 +1710,15 @@ struct drm_i915_gem_context_param { * to specify a gap in the array that can be filled in later, e.g. by a * virtual engine used for load balancing. * - * Setting the number of engines bound to the context to 0, by passing a zero - * sized argument, will revert back to default settings. + * The engine set should only be set via I915_CONTEXT_CREATE_EXT_SETPARAM. + * + * On GPUs with graphics version 12 and earlier, it may also be set via + * DRM_IOCTL_I915_GEM_CONTEXT_SETPARAM. However, this is only for + * backwards compatibility with old userspace and should be considered + * deprecated. Starting with graphics version 13, it can only be set via + * I915_CONTEXT_CREATE_EXT_SETPARAM. When using setparam, it may only be + * set once for each context and, once the context has been used with any + * ioctl other than I915_CONTEXT_CREATE_EXT_SETPARAM, it may not be set. * * See struct i915_context_param_engines. *