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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 5AFCDC3ABDD for ; Mon, 19 May 2025 17:58:31 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A6F4510E460; Mon, 19 May 2025 17:58:30 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="buifdEmk"; dkim-atps=neutral Received: from mail-pf1-f180.google.com (mail-pf1-f180.google.com [209.85.210.180]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0EA9F10E46C; Mon, 19 May 2025 17:58:29 +0000 (UTC) Received: by mail-pf1-f180.google.com with SMTP id d2e1a72fcca58-7390d21bb1cso4321317b3a.2; Mon, 19 May 2025 10:58:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1747677508; x=1748282308; darn=lists.freedesktop.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=wYI2zRJOtd0DrZN4qncIv20rYHQymHOcIiawR317nWQ=; b=buifdEmkJ/beEozGsWuYu1d8WPF3eYBe8KT3QV6K2M+NDIRp8AS1jAbCnDDD245YP9 uQ3TUM/TTEvg8UpDoY7TTFCY3EhgUGmPBZn/z3CoHWErHCLLeGzTHpLNltyRBMXVx52a nDXxQYqGpHxRElfZuGISKo085rzx2O+B6w5mVHfGXRIo7cXinhwiJZ4GvJPLkpEIQSVt eb4jDU/qw1sWb344Y21yLQRh1NEipC+XHEiIV9NPnlzNMNtozJSrC9ddzsxOFEPmiwM9 Y5897ttrWhGdHbxqkwXyqAFc/syON6o2ax+5m4PJkiPNFYV6Huv10FXxvXawL968yOIx GCmQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1747677508; x=1748282308; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=wYI2zRJOtd0DrZN4qncIv20rYHQymHOcIiawR317nWQ=; b=xM/OX3BDPjf9c0xL3GR1Vxkx+H86SYGyaWJqRyHqyR36spppjPcnPc+MHHX+6tbOuZ YTqN5jPy9cF6rbehHIDDOcLeYiFxe+5U6WvUnDQSK2QDbr44KcrgU+zwhE6ynSpjGGzj sn2Mo80AZunCYV7cfSxg81FY+VYYAqjeL9UmHq2vSpV/xFybUQHGKpjcCyATtf2X6vTt yCE2JRG+XKg5pTcwsu7/5pjEMPc2tmAlAueFwzO9j2ETbdjA9uEDkexWFtn2At/ueKZC RdpMZdf62EcOjJcTRKah+5ZDBR2dDqdRiIzJ7POFbJB6NWYR0stpZB4m9Jlk0D2u/xqx m7nA== X-Gm-Message-State: AOJu0YwAelTzU31fxc946mjgqZW5HFft1MhLq/bQbvg24tUjHKWZzhfO SR+gYS08VL2qYOzRBt+otFYu7BFVc2GK3Lxf9T/QAsIyS3Htn9PXgntzhAjOsQ== X-Gm-Gg: ASbGnctuL8A6/gbj9iLQ7nzln+c5RsfGCjqA9BofySInmhAHARps61r8t/s01b6I7gK z4huFlWJdKHvL+4FzbqzYmuCWeP/AQf2IWe62fSn1jntr7FW37shqa9Drz9ykmjrKQZdSs0VioO 9yo3rmOrZn0nz61TZoFL8xNyQLNt4ev7Q0+VnRnRoAfQBcMCp0gXaaFZg5OKlgS0DY90HoWhkl0 k9VgRUNoVUriNOUtTp2IOvuPUfUiVJs9SMqIsO2beQY5SeMH4F9+LUod1E5v+eWnq8ZlUAJV7KV LULi9EhWKiU/TCUlwNGLVMAC2fwI98RPt4kk+G9cUiZ90nYt+CQhi69dxgaGFDjzHKww2KG+7oK jAq6mZXrr8PMpq1B0ZLl9fI1bPw== X-Google-Smtp-Source: AGHT+IFzBCS9nXCRFLRNGKyzZg3GWPK2vE74D3SoO9nls63JyJkY7kSswkhFeCAR1kOXNf3TDeRLZA== X-Received: by 2002:a05:6a20:6a2b:b0:215:d38f:11d1 with SMTP id adf61e73a8af0-216219bd5aemr18354925637.29.1747677508122; Mon, 19 May 2025 10:58:28 -0700 (PDT) Received: from localhost ([2a00:79e0:3e00:2601:3afc:446b:f0df:eadc]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b26eaf5c6b0sm6598482a12.7.2025.05.19.10.58.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 May 2025 10:58:27 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, Connor Abbott , Rob Clark , Rob Clark , Abhinav Kumar , Dmitry Baryshkov , Sean Paul , Marijn Suijten , David Airlie , Simona Vetter , Konrad Dybcio , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Sumit Semwal , =?UTF-8?q?Christian=20K=C3=B6nig?= , linux-kernel@vger.kernel.org (open list), linux-media@vger.kernel.org (open list:DMA BUFFER SHARING FRAMEWORK:Keyword:\bdma_(?:buf|fence|resv)\b), linaro-mm-sig@lists.linaro.org (moderated list:DMA BUFFER SHARING FRAMEWORK:Keyword:\bdma_(?:buf|fence|resv)\b) Subject: [PATCH v5 24/40] drm/msm: Add _NO_SHARE flag Date: Mon, 19 May 2025 10:57:21 -0700 Message-ID: <20250519175755.13037-12-robdclark@gmail.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250519175755.13037-1-robdclark@gmail.com> References: <20250519175348.11924-1-robdclark@gmail.com> <20250519175755.13037-1-robdclark@gmail.com> 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: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Rob Clark Buffers that are not shared between contexts can share a single resv object. This way drm_gpuvm will not track them as external objects, and submit-time validating overhead will be O(1) for all N non-shared BOs, instead of O(n). Signed-off-by: Rob Clark --- drivers/gpu/drm/msm/msm_drv.h | 1 + drivers/gpu/drm/msm/msm_gem.c | 23 +++++++++++++++++++++++ drivers/gpu/drm/msm/msm_gem_prime.c | 15 +++++++++++++++ include/uapi/drm/msm_drm.h | 14 ++++++++++++++ 4 files changed, 53 insertions(+) diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h index b77fd2c531c3..b0add236cbb3 100644 --- a/drivers/gpu/drm/msm/msm_drv.h +++ b/drivers/gpu/drm/msm/msm_drv.h @@ -246,6 +246,7 @@ int msm_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map); void msm_gem_prime_vunmap(struct drm_gem_object *obj, struct iosys_map *map); struct drm_gem_object *msm_gem_prime_import_sg_table(struct drm_device *dev, struct dma_buf_attachment *attach, struct sg_table *sg); +struct dma_buf *msm_gem_prime_export(struct drm_gem_object *obj, int flags); int msm_gem_prime_pin(struct drm_gem_object *obj); void msm_gem_prime_unpin(struct drm_gem_object *obj); diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c index 36b9e9eefc3c..65ec99526f82 100644 --- a/drivers/gpu/drm/msm/msm_gem.c +++ b/drivers/gpu/drm/msm/msm_gem.c @@ -532,6 +532,9 @@ static int get_and_pin_iova_range_locked(struct drm_gem_object *obj, msm_gem_assert_locked(obj); + if (to_msm_bo(obj)->flags & MSM_BO_NO_SHARE) + return -EINVAL; + vma = get_vma_locked(obj, vm, range_start, range_end); if (IS_ERR(vma)) return PTR_ERR(vma); @@ -1060,6 +1063,16 @@ static void msm_gem_free_object(struct drm_gem_object *obj) put_pages(obj); } + if (obj->resv != &obj->_resv) { + struct drm_gem_object *r_obj = + container_of(obj->resv, struct drm_gem_object, _resv); + + BUG_ON(!(msm_obj->flags & MSM_BO_NO_SHARE)); + + /* Drop reference we hold to shared resv obj: */ + drm_gem_object_put(r_obj); + } + drm_gem_object_release(obj); kfree(msm_obj->metadata); @@ -1092,6 +1105,15 @@ int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file, if (name) msm_gem_object_set_name(obj, "%s", name); + if (flags & MSM_BO_NO_SHARE) { + struct msm_context *ctx = file->driver_priv; + struct drm_gem_object *r_obj = drm_gpuvm_resv_obj(ctx->vm); + + drm_gem_object_get(r_obj); + + obj->resv = r_obj->resv; + } + ret = drm_gem_handle_create(file, obj, handle); /* drop reference from allocate - handle holds it now */ @@ -1124,6 +1146,7 @@ static const struct drm_gem_object_funcs msm_gem_object_funcs = { .free = msm_gem_free_object, .open = msm_gem_open, .close = msm_gem_close, + .export = msm_gem_prime_export, .pin = msm_gem_prime_pin, .unpin = msm_gem_prime_unpin, .get_sg_table = msm_gem_prime_get_sg_table, diff --git a/drivers/gpu/drm/msm/msm_gem_prime.c b/drivers/gpu/drm/msm/msm_gem_prime.c index ee267490c935..1a6d8099196a 100644 --- a/drivers/gpu/drm/msm/msm_gem_prime.c +++ b/drivers/gpu/drm/msm/msm_gem_prime.c @@ -16,6 +16,9 @@ struct sg_table *msm_gem_prime_get_sg_table(struct drm_gem_object *obj) struct msm_gem_object *msm_obj = to_msm_bo(obj); int npages = obj->size >> PAGE_SHIFT; + if (msm_obj->flags & MSM_BO_NO_SHARE) + return ERR_PTR(-EINVAL); + if (WARN_ON(!msm_obj->pages)) /* should have already pinned! */ return ERR_PTR(-ENOMEM); @@ -45,6 +48,15 @@ struct drm_gem_object *msm_gem_prime_import_sg_table(struct drm_device *dev, return msm_gem_import(dev, attach->dmabuf, sg); } + +struct dma_buf *msm_gem_prime_export(struct drm_gem_object *obj, int flags) +{ + if (to_msm_bo(obj)->flags & MSM_BO_NO_SHARE) + return ERR_PTR(-EPERM); + + return drm_gem_prime_export(obj, flags); +} + int msm_gem_prime_pin(struct drm_gem_object *obj) { struct page **pages; @@ -53,6 +65,9 @@ int msm_gem_prime_pin(struct drm_gem_object *obj) if (obj->import_attach) return 0; + if (to_msm_bo(obj)->flags & MSM_BO_NO_SHARE) + return -EINVAL; + pages = msm_gem_pin_pages_locked(obj); if (IS_ERR(pages)) ret = PTR_ERR(pages); diff --git a/include/uapi/drm/msm_drm.h b/include/uapi/drm/msm_drm.h index b974f5a24dbc..1bccc347945c 100644 --- a/include/uapi/drm/msm_drm.h +++ b/include/uapi/drm/msm_drm.h @@ -140,6 +140,19 @@ struct drm_msm_param { #define MSM_BO_SCANOUT 0x00000001 /* scanout capable */ #define MSM_BO_GPU_READONLY 0x00000002 +/* Private buffers do not need to be explicitly listed in the SUBMIT + * ioctl, unless referenced by a drm_msm_gem_submit_cmd. Private + * buffers may NOT be imported/exported or used for scanout (or any + * other situation where buffers can be indefinitely pinned, but + * cases other than scanout are all kernel owned BOs which are not + * visible to userspace). + * + * In exchange for those constraints, all private BOs associated with + * a single context (drm_file) share a single dma_resv, and if there + * has been no eviction since the last submit, there are no per-BO + * bookeeping to do, significantly cutting the SUBMIT overhead. + */ +#define MSM_BO_NO_SHARE 0x00000004 #define MSM_BO_CACHE_MASK 0x000f0000 /* cache modes */ #define MSM_BO_CACHED 0x00010000 @@ -149,6 +162,7 @@ struct drm_msm_param { #define MSM_BO_FLAGS (MSM_BO_SCANOUT | \ MSM_BO_GPU_READONLY | \ + MSM_BO_NO_SHARE | \ MSM_BO_CACHE_MASK) struct drm_msm_gem_new { -- 2.49.0