From patchwork Wed Nov 1 09:22:20 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhang, Tina" X-Patchwork-Id: 10036049 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 86AEA600C5 for ; Wed, 1 Nov 2017 09:27:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 761F62863D for ; Wed, 1 Nov 2017 09:27:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6AB5E28B30; Wed, 1 Nov 2017 09:27:48 +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=-4.2 required=2.0 tests=BAYES_00, 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 D41A82863D for ; Wed, 1 Nov 2017 09:27:47 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 732996E6DE; Wed, 1 Nov 2017 09:27:47 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id B96CD6E6E1; Wed, 1 Nov 2017 09:27:46 +0000 (UTC) Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga104.jf.intel.com with ESMTP; 01 Nov 2017 02:27:46 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.44,327,1505804400"; d="scan'208";a="170416282" Received: from tinazhang-linux-1.bj.intel.com ([10.238.158.80]) by fmsmga006.fm.intel.com with ESMTP; 01 Nov 2017 02:27:44 -0700 From: Tina Zhang To: zhenyuw@linux.intel.com, zhi.a.wang@intel.com, daniel@ffwll.ch, joonas.lahtinen@linux.intel.com, chris@chris-wilson.co.uk Date: Wed, 1 Nov 2017 17:22:20 +0800 Message-Id: <1509528141-4189-2-git-send-email-tina.zhang@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1509528141-4189-1-git-send-email-tina.zhang@intel.com> References: <1509528141-4189-1-git-send-email-tina.zhang@intel.com> Cc: Daniel Vetter , intel-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org Subject: [Intel-gfx] [PATCH v2 1/2] drm/i915: Introduce GEM proxy X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 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 GEM proxy is a kind of GEM, whose backing physical memory is pinned and produced by guest VM and is used by host as read only. With GEM proxy, host is able to access guest physical memory through GEM object interface. As GEM proxy is such a special kind of GEM, a new flag I915_GEM_OBJECT_IS_PROXY is introduced to ban host from changing the backing storage of GEM proxy. v2: - return -ENXIO when pin and map pages of GEM proxy to kernel space. (Chris) Here are the histories of this patch in "Dma-buf support for Gvt-g" patch-set: v14: - return -ENXIO when gem proxy object is banned by ioctl. (Chris) (Daniel) v13: - add comments to GEM proxy. (Chris) - don't ban GEM proxy in i915_gem_sw_finish_ioctl. (Chris) - check GEM proxy bar after finishing i915_gem_object_wait. (Chris) - remove GEM proxy bar in i915_gem_madvise_ioctl. v6: - add gem proxy barrier in the following ioctls. (Chris) i915_gem_set_caching_ioctl i915_gem_set_domain_ioctl i915_gem_sw_finish_ioctl i915_gem_set_tiling_ioctl i915_gem_madvise_ioctl Signed-off-by: Tina Zhang Reviewed-by: Joonas Lahtinen Reviewed-by: Chris Wilson Cc: Daniel Vetter Reviewed-by: Joonas #vX Reviewed-by: Chris --- drivers/gpu/drm/i915/i915_gem.c | 25 ++++++++++++++++++++++++- drivers/gpu/drm/i915/i915_gem_object.h | 11 +++++++++-- drivers/gpu/drm/i915/i915_gem_tiling.c | 8 ++++++++ 3 files changed, 41 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 82a1003..13bc18d 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1593,6 +1593,16 @@ i915_gem_set_domain_ioctl(struct drm_device *dev, void *data, if (err) goto out; + /* Proxy objects do not control access to the backing storage, ergo + * they cannot be used as a means to manipulate the cache domain + * tracking for that backing storage. The proxy object is always + * considered to be outside of any cache domain. + */ + if (i915_gem_object_is_proxy(obj)) { + err = -ENXIO; + goto out; + } + /* Flush and acquire obj->pages so that we are coherent through * direct access in memory with previous cached writes through * shmemfs and that our cache domain tracking remains valid. @@ -1649,6 +1659,10 @@ i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data, if (!obj) return -ENOENT; + /* Proxy objects are barred from CPU access, so there is no + * need to ban sw_finish as it is a nop. + */ + /* Pinned buffers may be scanout, so flush the cache */ i915_gem_object_flush_if_display(obj); i915_gem_object_put(obj); @@ -2614,7 +2628,8 @@ void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj, void *ptr; int ret; - GEM_BUG_ON(!i915_gem_object_has_struct_page(obj)); + if (unlikely(!i915_gem_object_has_struct_page(obj))) + return ERR_PTR(-ENODEV); ret = mutex_lock_interruptible(&obj->mm.lock); if (ret) @@ -3766,6 +3781,14 @@ int i915_gem_set_caching_ioctl(struct drm_device *dev, void *data, if (!obj) return -ENOENT; + /* The caching mode of proxy object is handled by its generator, and not + * expected to be changed by user mode. + */ + if (i915_gem_object_is_proxy(obj)) { + ret = -ENXIO; + goto out; + } + if (obj->cache_level == level) goto out; diff --git a/drivers/gpu/drm/i915/i915_gem_object.h b/drivers/gpu/drm/i915/i915_gem_object.h index 956c911..78d65db 100644 --- a/drivers/gpu/drm/i915/i915_gem_object.h +++ b/drivers/gpu/drm/i915/i915_gem_object.h @@ -53,8 +53,9 @@ struct i915_lut_handle { struct drm_i915_gem_object_ops { unsigned int flags; -#define I915_GEM_OBJECT_HAS_STRUCT_PAGE BIT(0) -#define I915_GEM_OBJECT_IS_SHRINKABLE BIT(1) +#define I915_GEM_OBJECT_HAS_STRUCT_PAGE BIT(0) +#define I915_GEM_OBJECT_IS_SHRINKABLE BIT(1) +#define I915_GEM_OBJECT_IS_PROXY BIT(2) /* Interface between the GEM object and its backing storage. * get_pages() is called once prior to the use of the associated set @@ -355,6 +356,12 @@ i915_gem_object_is_shrinkable(const struct drm_i915_gem_object *obj) } static inline bool +i915_gem_object_is_proxy(const struct drm_i915_gem_object *obj) +{ + return obj->ops->flags & I915_GEM_OBJECT_IS_PROXY; +} + +static inline bool i915_gem_object_is_active(const struct drm_i915_gem_object *obj) { return obj->active_count; diff --git a/drivers/gpu/drm/i915/i915_gem_tiling.c b/drivers/gpu/drm/i915/i915_gem_tiling.c index fb5231f..f617012 100644 --- a/drivers/gpu/drm/i915/i915_gem_tiling.c +++ b/drivers/gpu/drm/i915/i915_gem_tiling.c @@ -345,6 +345,14 @@ i915_gem_set_tiling_ioctl(struct drm_device *dev, void *data, if (!obj) return -ENOENT; + /* The tiling mode of proxy objects is handled by its generator, and not + * expected to be changed by user mode. + */ + if (i915_gem_object_is_proxy(obj)) { + err = -ENXIO; + goto err; + } + if (!i915_tiling_ok(obj, args->tiling_mode, args->stride)) { err = -EINVAL; goto err;