From patchwork Mon Apr 11 21:58:39 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 559621 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C683DC4332F for ; Mon, 11 Apr 2022 21:58:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350274AbiDKWA7 (ORCPT ); Mon, 11 Apr 2022 18:00:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59770 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350292AbiDKWA5 (ORCPT ); Mon, 11 Apr 2022 18:00:57 -0400 Received: from mail-pl1-x62c.google.com (mail-pl1-x62c.google.com [IPv6:2607:f8b0:4864:20::62c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 63DD211C02; Mon, 11 Apr 2022 14:58:42 -0700 (PDT) Received: by mail-pl1-x62c.google.com with SMTP id n18so15031344plg.5; Mon, 11 Apr 2022 14:58:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=Dtgr6DYJ0qUGmOxJ81OL+NkRbDmdTgtEm+OJ0YJIztE=; b=O0d3ZuxLPBA0aeNZx3ThFsReo+RszKNL1+20+f7XlSlsKmtoYQu/arbBUYtgGyCfBr OCSYQ1UwJ/z3M/0iilQJcAb7gvJT4cPdeVqwajOE50Xs61BXUQdJw4vmpuvtxoBI9Ks1 RGe7K2OuYRmsGUnVNjNPVDH41SLD5Uhrx+2DlenmwwzYdKGEUqbALXShN6bMnKCFSAHR GXfj/0S3H7yZ9RiYd81ZDPvN4M0QUUFH20yJMSMod/7heIpIKlhWyW9xIpuMZsDoRwVG 4LN2MRKMuiZAtFK+gPvEaTHdAOV/KMm1bnEQ9ReQDgW1k0N6TIrwNbVtdh+g9ihfkRgc ZmaA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=Dtgr6DYJ0qUGmOxJ81OL+NkRbDmdTgtEm+OJ0YJIztE=; b=QqjM7QsrVfyTOAAztrWtG23X/hBCuxvd75LGOfrcC9he/Q1GfjqQTl9gYcvmMZSqwa fHjiFSg8RdElOKnGAutQC/C8u8fngFRF6c13z4fpC2wEPgFIJPTfrruMtnCIu04V8cqW XDOGKC/zQ2MULTpNHgOI7SEMIrASyA3THdvVujewJKcldwFUE6y/GUXjmljjbbkhcvkp hXiFN+dgapSwpzVTiNRM2aPzreJuWXWuRBctQYSsv2FfCAnNdqCVGQIzmhCAxa2bmerW EscNXkyYg0pPuhFCE1hzRqAbisFYHas6gLA0CEV94u+2dV67B/rIxNIahHc0ewEebeld buTg== X-Gm-Message-State: AOAM53339/ytACXtJ4dkjs0f5Hj4dpdS4RHTi6TGYk/643XuCyxI3w++ ejRek5yhKeAIIZjBJnQqzds= X-Google-Smtp-Source: ABdhPJyQQIZulZLVsNA8CkXz6Xo7Begx6I+UNnNXlDMbm24AUZMDkyu0iZc6a7Lb7NHxYWP7/ouWGA== X-Received: by 2002:a17:902:ce02:b0:153:bd65:5c0e with SMTP id k2-20020a170902ce0200b00153bd655c0emr34137421plg.160.1649714321692; Mon, 11 Apr 2022 14:58:41 -0700 (PDT) Received: from localhost ([2a00:79e1:abd:4a00:2703:3c72:eb1a:cffd]) by smtp.gmail.com with ESMTPSA id gn21-20020a17090ac79500b001ca3c37af65sm447127pjb.21.2022.04.11.14.58.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 Apr 2022 14:58:40 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Dmitry Baryshkov , Dmitry Osipenko , Rob Clark , Rob Clark , Sean Paul , Abhinav Kumar , David Airlie , Daniel Vetter , Akhil P Oommen , Jonathan Marek , =?utf-8?q?Christian_K=C3=B6nig?= , Jordan Crouse , Dan Carpenter , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v4 10/10] drm/msm: Add a way for userspace to allocate GPU iova Date: Mon, 11 Apr 2022 14:58:39 -0700 Message-Id: <20220411215849.297838-11-robdclark@gmail.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220411215849.297838-1-robdclark@gmail.com> References: <20220411215849.297838-1-robdclark@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org From: Rob Clark The motivation at this point is mainly native userspace mesa driver in a VM guest. The one remaining synchronous "hotpath" is buffer allocation, because guest needs to wait to know the bo's iova before it can start emitting cmdstream/state that references the new bo. By allocating the iova in the guest userspace, we no longer need to wait for a response from the host, but can just rely on the allocation request being processed before the cmdstream submission. Allocation failures (OoM, etc) would just be treated as context-lost (ie. GL_GUILTY_CONTEXT_RESET) or subsequent allocations (or readpix, etc) can raise GL_OUT_OF_MEMORY. v2: Fix inuse check v3: Change mismatched iova case to -EBUSY Signed-off-by: Rob Clark Reviewed-by: Dmitry Baryshkov Reviewed-by: Dmitry Osipenko --- drivers/gpu/drm/msm/adreno/adreno_gpu.c | 10 ++++++ drivers/gpu/drm/msm/msm_drv.c | 21 +++++++++++ drivers/gpu/drm/msm/msm_gem.c | 48 +++++++++++++++++++++++++ drivers/gpu/drm/msm/msm_gem.h | 8 +++++ drivers/gpu/drm/msm/msm_gem_vma.c | 2 ++ include/uapi/drm/msm_drm.h | 3 ++ 6 files changed, 92 insertions(+) diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c index 6385ab06632f..4caae0229518 100644 --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c @@ -281,6 +281,16 @@ int adreno_get_param(struct msm_gpu *gpu, struct msm_file_private *ctx, case MSM_PARAM_SUSPENDS: *value = gpu->suspend_count; return 0; + case MSM_PARAM_VA_START: + if (ctx->aspace == gpu->aspace) + return -EINVAL; + *value = ctx->aspace->va_start; + return 0; + case MSM_PARAM_VA_SIZE: + if (ctx->aspace == gpu->aspace) + return -EINVAL; + *value = ctx->aspace->va_size; + return 0; default: DBG("%s: invalid param: %u", gpu->name, param); return -EINVAL; diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c index d618953d33ea..34e2169308b4 100644 --- a/drivers/gpu/drm/msm/msm_drv.c +++ b/drivers/gpu/drm/msm/msm_drv.c @@ -722,6 +722,23 @@ static int msm_ioctl_gem_info_iova(struct drm_device *dev, return msm_gem_get_iova(obj, ctx->aspace, iova); } +static int msm_ioctl_gem_info_set_iova(struct drm_device *dev, + struct drm_file *file, struct drm_gem_object *obj, + uint64_t iova) +{ + struct msm_drm_private *priv = dev->dev_private; + struct msm_file_private *ctx = file->driver_priv; + + if (!priv->gpu) + return -EINVAL; + + /* Only supported if per-process address space is supported: */ + if (priv->gpu->aspace == ctx->aspace) + return -EOPNOTSUPP; + + return msm_gem_set_iova(obj, ctx->aspace, iova); +} + static int msm_ioctl_gem_info(struct drm_device *dev, void *data, struct drm_file *file) { @@ -736,6 +753,7 @@ static int msm_ioctl_gem_info(struct drm_device *dev, void *data, switch (args->info) { case MSM_INFO_GET_OFFSET: case MSM_INFO_GET_IOVA: + case MSM_INFO_SET_IOVA: /* value returned as immediate, not pointer, so len==0: */ if (args->len) return -EINVAL; @@ -760,6 +778,9 @@ static int msm_ioctl_gem_info(struct drm_device *dev, void *data, case MSM_INFO_GET_IOVA: ret = msm_ioctl_gem_info_iova(dev, file, obj, &args->value); break; + case MSM_INFO_SET_IOVA: + ret = msm_ioctl_gem_info_set_iova(dev, file, obj, args->value); + break; case MSM_INFO_SET_NAME: /* length check should leave room for terminating null: */ if (args->len >= sizeof(msm_obj->name)) { diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c index bf4af17e2f1e..3ee30b8a76bd 100644 --- a/drivers/gpu/drm/msm/msm_gem.c +++ b/drivers/gpu/drm/msm/msm_gem.c @@ -525,6 +525,54 @@ int msm_gem_get_iova(struct drm_gem_object *obj, return ret; } +static int clear_iova(struct drm_gem_object *obj, + struct msm_gem_address_space *aspace) +{ + struct msm_gem_vma *vma = lookup_vma(obj, aspace); + + if (!vma) + return 0; + + if (msm_gem_vma_inuse(vma)) + return -EBUSY; + + msm_gem_purge_vma(vma->aspace, vma); + msm_gem_close_vma(vma->aspace, vma); + del_vma(vma); + + return 0; +} + +/* + * Get the requested iova but don't pin it. Fails if the requested iova is + * not available. Doesn't need a put because iovas are currently valid for + * the life of the object. + * + * Setting an iova of zero will clear the vma. + */ +int msm_gem_set_iova(struct drm_gem_object *obj, + struct msm_gem_address_space *aspace, uint64_t iova) +{ + int ret = 0; + + msm_gem_lock(obj); + if (!iova) { + ret = clear_iova(obj, aspace); + } else { + struct msm_gem_vma *vma; + vma = get_vma_locked(obj, aspace, iova, iova + obj->size); + if (IS_ERR(vma)) { + ret = PTR_ERR(vma); + } else if (GEM_WARN_ON(vma->iova != iova)) { + clear_iova(obj, aspace); + ret = -EBUSY; + } + } + msm_gem_unlock(obj); + + return ret; +} + /* * Unpin a iova by updating the reference counts. The memory isn't actually * purged until something else (shrinker, mm_notifier, destroy, etc) decides diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h index 580b6eb95edd..c75d3b879a53 100644 --- a/drivers/gpu/drm/msm/msm_gem.h +++ b/drivers/gpu/drm/msm/msm_gem.h @@ -38,6 +38,12 @@ struct msm_gem_address_space { /* @faults: the number of GPU hangs associated with this address space */ int faults; + + /** @va_start: lowest possible address to allocate */ + uint64_t va_start; + + /** @va_size: the size of the address space (in bytes) */ + uint64_t va_size; }; struct msm_gem_address_space * @@ -144,6 +150,8 @@ struct msm_gem_vma *msm_gem_get_vma_locked(struct drm_gem_object *obj, struct msm_gem_address_space *aspace); int msm_gem_get_iova(struct drm_gem_object *obj, struct msm_gem_address_space *aspace, uint64_t *iova); +int msm_gem_set_iova(struct drm_gem_object *obj, + struct msm_gem_address_space *aspace, uint64_t iova); int msm_gem_get_and_pin_iova_range(struct drm_gem_object *obj, struct msm_gem_address_space *aspace, uint64_t *iova, u64 range_start, u64 range_end); diff --git a/drivers/gpu/drm/msm/msm_gem_vma.c b/drivers/gpu/drm/msm/msm_gem_vma.c index 0cd6770faf41..3c1dc9241831 100644 --- a/drivers/gpu/drm/msm/msm_gem_vma.c +++ b/drivers/gpu/drm/msm/msm_gem_vma.c @@ -184,6 +184,8 @@ msm_gem_address_space_create(struct msm_mmu *mmu, const char *name, spin_lock_init(&aspace->lock); aspace->name = name; aspace->mmu = mmu; + aspace->va_start = va_start; + aspace->va_size = size; drm_mm_init(&aspace->mm, va_start, size); diff --git a/include/uapi/drm/msm_drm.h b/include/uapi/drm/msm_drm.h index 794ad1948497..3c7b097c4e3d 100644 --- a/include/uapi/drm/msm_drm.h +++ b/include/uapi/drm/msm_drm.h @@ -84,6 +84,8 @@ struct drm_msm_timespec { #define MSM_PARAM_SYSPROF 0x0b /* WO: 1 preserves perfcntrs, 2 also disables suspend */ #define MSM_PARAM_COMM 0x0c /* WO: override for task->comm */ #define MSM_PARAM_CMDLINE 0x0d /* WO: override for task cmdline */ +#define MSM_PARAM_VA_START 0x0e /* RO: start of valid GPU iova range */ +#define MSM_PARAM_VA_SIZE 0x0f /* RO: size of valid GPU iova range (bytes) */ /* For backwards compat. The original support for preemption was based on * a single ring per priority level so # of priority levels equals the # @@ -135,6 +137,7 @@ struct drm_msm_gem_new { #define MSM_INFO_GET_IOVA 0x01 /* get iova, returned by value */ #define MSM_INFO_SET_NAME 0x02 /* set the debug name (by pointer) */ #define MSM_INFO_GET_NAME 0x03 /* get debug name, returned by pointer */ +#define MSM_INFO_SET_IOVA 0x04 /* set the iova, passed by value */ struct drm_msm_gem_info { __u32 handle; /* in */