From patchwork Fri Jul 1 22:50:48 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Niranjana Vishwanathapura X-Patchwork-Id: 12903829 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 7BE32C43334 for ; Fri, 1 Jul 2022 22:51:28 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0DF3B11255A; Fri, 1 Jul 2022 22:51:19 +0000 (UTC) Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4BD7A112582; Fri, 1 Jul 2022 22:51:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1656715878; x=1688251878; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=s7Ug2do/8iGSB8C1QX3o3hMS91Dbgi1y10u494GDi1Q=; b=P7lbZaKd3dddYomodp3sf60u4Ai8y6KTbw1IFEQ4os3IPY2hzM+qVKv+ +PkfI9AARD8OchqXW0U+B5N1EtR+QiMfP6p0DbqPkr6UZ+DKGvpql1RxN hdYnOmW1zHh8SdR9wcVJ0DVLyM0nFXKQ7C9VJtzgEPw39NxGdLFFCbP2b 6er2A/fZsGVLf0Ag+PTRG9mqoHf0U5nDczWmcdpa01R8s4c0Jz9vlXDSG K/NnmUZFLG4HzGULvvG1z3r/5EZvqCSaY0Yf//7OQc9dZ4EWZJSvYcq5w DTUA6neTowJTs7/yEdei8Yx8E33Z2b1Hvyo+FVTtECJH7YZzAY7iBwjoW w==; X-IronPort-AV: E=McAfee;i="6400,9594,10395"; a="282789049" X-IronPort-AV: E=Sophos;i="5.92,238,1650956400"; d="scan'208";a="282789049" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Jul 2022 15:51:17 -0700 X-IronPort-AV: E=Sophos;i="5.92,238,1650956400"; d="scan'208";a="918645093" Received: from nvishwa1-desk.sc.intel.com ([172.25.29.76]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-SHA; 01 Jul 2022 15:51:17 -0700 From: Niranjana Vishwanathapura To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [RFC 03/10] drm/i915/vm_bind: Support private and shared BOs Date: Fri, 1 Jul 2022 15:50:48 -0700 Message-Id: <20220701225055.8204-4-niranjana.vishwanathapura@intel.com> X-Mailer: git-send-email 2.21.0.rc0.32.g243a4c7e27 In-Reply-To: <20220701225055.8204-1-niranjana.vishwanathapura@intel.com> References: <20220701225055.8204-1-niranjana.vishwanathapura@intel.com> 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: matthew.brost@intel.com, paulo.r.zanoni@intel.com, tvrtko.ursulin@intel.com, lionel.g.landwerlin@intel.com, thomas.hellstrom@intel.com, matthew.auld@intel.com, jason@jlekstrand.net, daniel.vetter@intel.com, christian.koenig@amd.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Add uapi allowing user to specify a BO as private to a specified VM during the BO creation. VM private BOs can only be mapped on the specified VM and can't be dma_buf exported. VM private BOs share a single common dma_resv object, hence has a performance advantage requiring a single dma_resv object update in the execbuf path compared to non-private (shared) BOs. Signed-off-by: Niranjana Vishwanathapura --- drivers/gpu/drm/i915/gem/i915_gem_create.c | 41 ++++++++++++++++++- drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 6 +++ .../gpu/drm/i915/gem/i915_gem_object_types.h | 3 ++ drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 3 ++ drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h | 11 +++++ .../drm/i915/gem/i915_gem_vm_bind_object.c | 9 ++++ drivers/gpu/drm/i915/gt/intel_gtt.c | 4 ++ drivers/gpu/drm/i915/gt/intel_gtt.h | 2 + drivers/gpu/drm/i915/i915_vma.c | 1 + drivers/gpu/drm/i915/i915_vma_types.h | 2 + include/uapi/drm/i915_drm.h | 30 ++++++++++++++ 11 files changed, 110 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_create.c b/drivers/gpu/drm/i915/gem/i915_gem_create.c index 927a87e5ec59..7e264566b51f 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_create.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_create.c @@ -11,6 +11,7 @@ #include "pxp/intel_pxp.h" #include "i915_drv.h" +#include "i915_gem_context.h" #include "i915_gem_create.h" #include "i915_trace.h" #include "i915_user_extensions.h" @@ -243,6 +244,7 @@ struct create_ext { unsigned int n_placements; unsigned int placement_mask; unsigned long flags; + u32 vm_id; }; static void repr_placements(char *buf, size_t size, @@ -392,9 +394,24 @@ static int ext_set_protected(struct i915_user_extension __user *base, void *data return 0; } +static int ext_set_vm_private(struct i915_user_extension __user *base, + void *data) +{ + struct drm_i915_gem_create_ext_vm_private ext; + struct create_ext *ext_data = data; + + if (copy_from_user(&ext, base, sizeof(ext))) + return -EFAULT; + + ext_data->vm_id = ext.vm_id; + + return 0; +} + static const i915_user_extension_fn create_extensions[] = { [I915_GEM_CREATE_EXT_MEMORY_REGIONS] = ext_set_placements, [I915_GEM_CREATE_EXT_PROTECTED_CONTENT] = ext_set_protected, + [I915_GEM_CREATE_EXT_VM_PRIVATE] = ext_set_vm_private, }; /** @@ -410,6 +427,7 @@ i915_gem_create_ext_ioctl(struct drm_device *dev, void *data, struct drm_i915_private *i915 = to_i915(dev); struct drm_i915_gem_create_ext *args = data; struct create_ext ext_data = { .i915 = i915 }; + struct i915_address_space *vm = NULL; struct drm_i915_gem_object *obj; int ret; @@ -423,6 +441,12 @@ i915_gem_create_ext_ioctl(struct drm_device *dev, void *data, if (ret) return ret; + if (ext_data.vm_id) { + vm = i915_gem_vm_lookup(file->driver_priv, ext_data.vm_id); + if (unlikely(!vm)) + return -ENOENT; + } + if (!ext_data.n_placements) { ext_data.placements[0] = intel_memory_region_by_type(i915, INTEL_MEMORY_SYSTEM); @@ -449,8 +473,21 @@ i915_gem_create_ext_ioctl(struct drm_device *dev, void *data, ext_data.placements, ext_data.n_placements, ext_data.flags); - if (IS_ERR(obj)) - return PTR_ERR(obj); + if (IS_ERR(obj)) { + ret = PTR_ERR(obj); + goto vm_put; + } + + if (vm) { + obj->base.resv = vm->root_obj->base.resv; + obj->priv_root = i915_gem_object_get(vm->root_obj); + i915_vm_put(vm); + } return i915_gem_publish(obj, file, &args->size, &args->handle); +vm_put: + if (vm) + i915_vm_put(vm); + + return ret; } diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c index f5062d0c6333..6433173c3e84 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c @@ -218,6 +218,12 @@ struct dma_buf *i915_gem_prime_export(struct drm_gem_object *gem_obj, int flags) struct drm_i915_gem_object *obj = to_intel_bo(gem_obj); DEFINE_DMA_BUF_EXPORT_INFO(exp_info); + if (obj->priv_root) { + drm_dbg(obj->base.dev, + "Exporting VM private objects is not allowed\n"); + return ERR_PTR(-EINVAL); + } + exp_info.ops = &i915_dmabuf_ops; exp_info.size = gem_obj->size; exp_info.flags = flags; diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h index 5cf36a130061..9fe3395ad4d9 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h @@ -241,6 +241,9 @@ struct drm_i915_gem_object { const struct drm_i915_gem_object_ops *ops; + /* Shared root is object private to a VM; NULL otherwise */ + struct drm_i915_gem_object *priv_root; + struct { /** * @vma.lock: protect the list/tree of vmas diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c index 7e1f8b83077f..f1912b12db00 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c @@ -1152,6 +1152,9 @@ void i915_ttm_bo_destroy(struct ttm_buffer_object *bo) i915_gem_object_release_memory_region(obj); mutex_destroy(&obj->ttm.get_io_page.lock); + if (obj->priv_root) + i915_gem_object_put(obj->priv_root); + if (obj->ttm.created) { /* * We freely manage the shrinker LRU outide of the mm.pages life diff --git a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h index 642cdb559f17..ee6e4c52e80e 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind.h @@ -26,6 +26,17 @@ static inline void i915_gem_vm_bind_unlock(struct i915_address_space *vm) mutex_unlock(&vm->vm_bind_lock); } +static inline int i915_gem_vm_priv_lock(struct i915_address_space *vm, + struct i915_gem_ww_ctx *ww) +{ + return i915_gem_object_lock(vm->root_obj, ww); +} + +static inline void i915_gem_vm_priv_unlock(struct i915_address_space *vm) +{ + i915_gem_object_unlock(vm->root_obj); +} + struct i915_vma * i915_gem_vm_bind_lookup_vma(struct i915_address_space *vm, u64 va); void i915_gem_vm_bind_remove(struct i915_vma *vma, bool release_obj); diff --git a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c index 43ceb4dcca6c..3201204c8e74 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c @@ -85,6 +85,7 @@ void i915_gem_vm_bind_remove(struct i915_vma *vma, bool release_obj) if (!list_empty(&vma->vm_bind_link)) { list_del_init(&vma->vm_bind_link); + list_del_init(&vma->non_priv_vm_bind_link); i915_vm_bind_it_remove(vma, &vma->vm->va); /* Release object */ @@ -185,6 +186,11 @@ int i915_gem_vm_bind_obj(struct i915_address_space *vm, goto put_obj; } + if (obj->priv_root && obj->priv_root != vm->root_obj) { + ret = -EINVAL; + goto put_obj; + } + ret = i915_gem_vm_bind_lock_interruptible(vm); if (ret) goto put_obj; @@ -211,6 +217,9 @@ int i915_gem_vm_bind_obj(struct i915_address_space *vm, list_add_tail(&vma->vm_bind_link, &vm->vm_bound_list); i915_vm_bind_it_insert(vma, &vm->va); + if (!obj->priv_root) + list_add_tail(&vma->non_priv_vm_bind_link, + &vm->non_priv_vm_bind_list); /* Hold object reference until vm_unbind */ i915_gem_object_get(vma->obj); diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c b/drivers/gpu/drm/i915/gt/intel_gtt.c index 135dc4a76724..df0a8459c3c6 100644 --- a/drivers/gpu/drm/i915/gt/intel_gtt.c +++ b/drivers/gpu/drm/i915/gt/intel_gtt.c @@ -176,6 +176,7 @@ int i915_vm_lock_objects(struct i915_address_space *vm, void i915_address_space_fini(struct i915_address_space *vm) { drm_mm_takedown(&vm->mm); + i915_gem_object_put(vm->root_obj); GEM_BUG_ON(!RB_EMPTY_ROOT(&vm->va.rb_root)); mutex_destroy(&vm->vm_bind_lock); } @@ -289,6 +290,9 @@ void i915_address_space_init(struct i915_address_space *vm, int subclass) INIT_LIST_HEAD(&vm->vm_bind_list); INIT_LIST_HEAD(&vm->vm_bound_list); mutex_init(&vm->vm_bind_lock); + INIT_LIST_HEAD(&vm->non_priv_vm_bind_list); + vm->root_obj = i915_gem_object_create_internal(vm->i915, PAGE_SIZE); + GEM_BUG_ON(IS_ERR(vm->root_obj)); } void *__px_vaddr(struct drm_i915_gem_object *p) diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h b/drivers/gpu/drm/i915/gt/intel_gtt.h index d4a6ce65251d..f538ce9115c9 100644 --- a/drivers/gpu/drm/i915/gt/intel_gtt.h +++ b/drivers/gpu/drm/i915/gt/intel_gtt.h @@ -267,6 +267,8 @@ struct i915_address_space { struct list_head vm_bound_list; /* va tree of persistent vmas */ struct rb_root_cached va; + struct list_head non_priv_vm_bind_list; + struct drm_i915_gem_object *root_obj; /* Global GTT */ bool is_ggtt:1; diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c index d324e29cef0a..f0226581d342 100644 --- a/drivers/gpu/drm/i915/i915_vma.c +++ b/drivers/gpu/drm/i915/i915_vma.c @@ -236,6 +236,7 @@ vma_create(struct drm_i915_gem_object *obj, mutex_unlock(&vm->mutex); INIT_LIST_HEAD(&vma->vm_bind_link); + INIT_LIST_HEAD(&vma->non_priv_vm_bind_link); return vma; err_unlock: diff --git a/drivers/gpu/drm/i915/i915_vma_types.h b/drivers/gpu/drm/i915/i915_vma_types.h index b6d179bdbfa0..2298b3d6b7c4 100644 --- a/drivers/gpu/drm/i915/i915_vma_types.h +++ b/drivers/gpu/drm/i915/i915_vma_types.h @@ -290,6 +290,8 @@ struct i915_vma { struct list_head vm_link; struct list_head vm_bind_link; /* Link in persistent VMA list */ + /* Link in non-private persistent VMA list */ + struct list_head non_priv_vm_bind_link; /** Interval tree structures for persistent vma */ struct rb_node rb; diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h index 26cca49717f8..ce1c6592b0d7 100644 --- a/include/uapi/drm/i915_drm.h +++ b/include/uapi/drm/i915_drm.h @@ -3542,9 +3542,13 @@ struct drm_i915_gem_create_ext { * * For I915_GEM_CREATE_EXT_PROTECTED_CONTENT usage see * struct drm_i915_gem_create_ext_protected_content. + * + * For I915_GEM_CREATE_EXT_VM_PRIVATE usage see + * struct drm_i915_gem_create_ext_vm_private. */ #define I915_GEM_CREATE_EXT_MEMORY_REGIONS 0 #define I915_GEM_CREATE_EXT_PROTECTED_CONTENT 1 +#define I915_GEM_CREATE_EXT_VM_PRIVATE 2 __u64 extensions; }; @@ -3662,6 +3666,32 @@ struct drm_i915_gem_create_ext_protected_content { /* ID of the protected content session managed by i915 when PXP is active */ #define I915_PROTECTED_CONTENT_DEFAULT_SESSION 0xf +/** + * struct drm_i915_gem_create_ext_vm_private - Extension to make the object + * private to the specified VM. + * + * See struct drm_i915_gem_create_ext. + * + * By default, BOs can be mapped on multiple VMs and can also be dma-buf + * exported. Hence these BOs are referred to as Shared BOs. + * During each execbuf3 submission, the request fence must be added to the + * dma-resv fence list of all shared BOs mapped on the VM. + * + * Unlike Shared BOs, these VM private BOs can only be mapped on the VM they + * are private to and can't be dma-buf exported. All private BOs of a VM share + * the dma-resv object. Hence during each execbuf3 submission, they need only + * one dma-resv fence list updated. Thus, the fast path (where required + * mappings are already bound) submission latency is O(1) w.r.t the number of + * VM private BOs. + */ +struct drm_i915_gem_create_ext_vm_private { + /** @base: Extension link. See struct i915_user_extension. */ + struct i915_user_extension base; + + /** @vm_id: Id of the VM to which the object is private */ + __u32 vm_id; +}; + /** * struct drm_i915_gem_vm_bind - VA to object mapping to bind. *