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 X-Spam-Level: X-Spam-Status: No, score=-13.6 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 autolearn=ham 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 D7980C48BD1 for ; Fri, 11 Jun 2021 14:41:12 +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 1B44361400 for ; Fri, 11 Jun 2021 14:41:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1B44361400 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch 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 59A516E24D; Fri, 11 Jun 2021 14:41:11 +0000 (UTC) Received: from mail-ot1-x333.google.com (mail-ot1-x333.google.com [IPv6:2607:f8b0:4864:20::333]) by gabe.freedesktop.org (Postfix) with ESMTPS id 99F166E24D for ; Fri, 11 Jun 2021 14:41:09 +0000 (UTC) Received: by mail-ot1-x333.google.com with SMTP id i12-20020a05683033ecb02903346fa0f74dso3329273otu.10 for ; Fri, 11 Jun 2021 07:41:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=h0BOS5/BPRM3idDKmXs++kRy94BzHENijqdesrYa0HE=; b=F4nxb6iUB3PYe1CNvZriDioNs6TbhUrnNLV/ATUnEXUukerisCu87I15ZzBY4dQMDM b3OrGpFjQJq5VKlX8cHh78f7xGqRif81vCjoD+HqBkylPydreMJ54NXJB7J+qv7w1M32 /X3+f5OlYiT5yrEf1gT+WHnbWBAk5xR3VOx/E= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=h0BOS5/BPRM3idDKmXs++kRy94BzHENijqdesrYa0HE=; b=KusOLB9RmGjhaIKjYdE+oAx8HCzWZrUjutO8BOcauQUsGylGWyM/6wDwR/AB7QV8c+ ESjEoVxN/NmKD3pYewwnF3inl4fjc/YO2d08NyqhxVR21G1I7JHFUwIW6TvE/InCC22N eaTX3Xm1apf5GijvIdLBeKAN4QGVGgpdCZuz8lEkqJrxi/JdodLDNu6GVyhuUERjZQ9D cHP4kH4pedPfrdSrtyNjQpsrTHlF0LLrfUhipKo9onO8QA6nQHI/K8L6Uy1olXvCvWn9 jywxrY1R8Pa5NnXMYFvHunRWX9qAHdLTC41bkVj5RHDwjy+PNwmXwdKhcJATNUR/FXGq rNYQ== X-Gm-Message-State: AOAM531oraHZLue7ezS/ZvJ3Zxa7SKX0a1E9KrVBfEKetD1q+wZDbPby CfJ6wcDynql/Tmus/a9lmh1KU7SOwb9hQFyPYrfgXg== X-Google-Smtp-Source: ABdhPJzN5G/oBNB1eBQfnN6titf6aMN6LGAVPuNLYK7W7fjGAvPMOCmq49Y0V/0mSjJUs07NyLyxZUq10wZMFZZo8+w= X-Received: by 2002:a05:6830:2370:: with SMTP id r16mr3432173oth.188.1623422469012; Fri, 11 Jun 2021 07:41:09 -0700 (PDT) MIME-Version: 1.0 References: <20210610091800.1833-1-christian.koenig@amd.com> <20210610091800.1833-3-christian.koenig@amd.com> <43177627-bc11-74b0-f88c-6475dd2904ff@gmail.com> In-Reply-To: <43177627-bc11-74b0-f88c-6475dd2904ff@gmail.com> From: Daniel Vetter Date: Fri, 11 Jun 2021 16:40:58 +0200 Message-ID: Subject: Re: [PATCH 2/7] dma-buf: add dma_fence_chain_alloc/free To: =?UTF-8?Q?Christian_K=C3=B6nig?= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable 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: amd-gfx list , dri-devel Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Fri, Jun 11, 2021 at 1:48 PM Christian K=C3=B6nig wrote: > > Am 11.06.21 um 09:54 schrieb Daniel Vetter: > > On Thu, Jun 10, 2021 at 11:17:55AM +0200, Christian K=C3=B6nig wrote: > >> Add a common allocation helper. Cleaning up the mix of kzalloc/kmalloc > >> and some unused code in the selftest. > >> > >> Signed-off-by: Christian K=C3=B6nig > >> --- > >> drivers/dma-buf/st-dma-fence-chain.c | 16 ++++---------- > >> drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 4 ++-- > >> drivers/gpu/drm/drm_syncobj.c | 6 ++--- > >> .../gpu/drm/i915/gem/i915_gem_execbuffer.c | 6 ++--- > >> drivers/gpu/drm/msm/msm_gem_submit.c | 6 ++--- > >> include/linux/dma-fence-chain.h | 22 +++++++++++++++++= ++ > >> 6 files changed, 35 insertions(+), 25 deletions(-) > >> > >> diff --git a/drivers/dma-buf/st-dma-fence-chain.c b/drivers/dma-buf/st= -dma-fence-chain.c > >> index 9525f7f56119..8ce1ea59d31b 100644 > >> --- a/drivers/dma-buf/st-dma-fence-chain.c > >> +++ b/drivers/dma-buf/st-dma-fence-chain.c > >> @@ -58,28 +58,20 @@ static struct dma_fence *mock_fence(void) > >> return &f->base; > >> } > >> > >> -static inline struct mock_chain { > >> - struct dma_fence_chain base; > >> -} *to_mock_chain(struct dma_fence *f) { > >> - return container_of(f, struct mock_chain, base.base); > >> -} > >> - > >> static struct dma_fence *mock_chain(struct dma_fence *prev, > >> struct dma_fence *fence, > >> u64 seqno) > >> { > >> - struct mock_chain *f; > >> + struct dma_fence_chain *f; > >> > >> - f =3D kmalloc(sizeof(*f), GFP_KERNEL); > >> + f =3D dma_fence_chain_alloc(); > >> if (!f) > >> return NULL; > >> > >> - dma_fence_chain_init(&f->base, > >> - dma_fence_get(prev), > >> - dma_fence_get(fence), > >> + dma_fence_chain_init(f, dma_fence_get(prev), dma_fence_get(fence)= , > >> seqno); > >> > >> - return &f->base.base; > >> + return &f->base; > >> } > >> > >> static int sanitycheck(void *arg) > >> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/= amd/amdgpu/amdgpu_cs.c > >> index 90136f9dedd6..325e82621467 100644 > >> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c > >> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c > >> @@ -1124,7 +1124,7 @@ static int amdgpu_cs_process_syncobj_timeline_ou= t_dep(struct amdgpu_cs_parser *p > >> > >> dep->chain =3D NULL; > >> if (syncobj_deps[i].point) { > >> - dep->chain =3D kmalloc(sizeof(*dep->chain), GFP_K= ERNEL); > >> + dep->chain =3D dma_fence_chain_alloc(); > >> if (!dep->chain) > >> return -ENOMEM; > >> } > >> @@ -1132,7 +1132,7 @@ static int amdgpu_cs_process_syncobj_timeline_ou= t_dep(struct amdgpu_cs_parser *p > >> dep->syncobj =3D drm_syncobj_find(p->filp, > >> syncobj_deps[i].handle); > >> if (!dep->syncobj) { > >> - kfree(dep->chain); > >> + dma_fence_chain_free(dep->chain); > >> return -EINVAL; > >> } > >> dep->point =3D syncobj_deps[i].point; > >> diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_synco= bj.c > >> index fdd2ec87cdd1..1c5b9ef6da37 100644 > >> --- a/drivers/gpu/drm/drm_syncobj.c > >> +++ b/drivers/gpu/drm/drm_syncobj.c > >> @@ -861,7 +861,7 @@ static int drm_syncobj_transfer_to_timeline(struct= drm_file *file_private, > >> &fence); > >> if (ret) > >> goto err; > >> - chain =3D kzalloc(sizeof(struct dma_fence_chain), GFP_KERNEL); > >> + chain =3D dma_fence_chain_alloc(); > >> if (!chain) { > >> ret =3D -ENOMEM; > >> goto err1; > >> @@ -1402,10 +1402,10 @@ drm_syncobj_timeline_signal_ioctl(struct drm_d= evice *dev, void *data, > >> goto err_points; > >> } > >> for (i =3D 0; i < args->count_handles; i++) { > >> - chains[i] =3D kzalloc(sizeof(struct dma_fence_chain), GFP= _KERNEL); > >> + chains[i] =3D dma_fence_chain_alloc(); > >> if (!chains[i]) { > >> for (j =3D 0; j < i; j++) > >> - kfree(chains[j]); > >> + dma_fence_chain_free(chains[j]); > >> ret =3D -ENOMEM; > >> goto err_chains; > >> } > >> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/= gpu/drm/i915/gem/i915_gem_execbuffer.c > >> index 66789111a24b..a22cb86730b3 100644 > >> --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c > >> +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c > >> @@ -2983,7 +2983,7 @@ __free_fence_array(struct eb_fence *fences, unsi= gned int n) > >> while (n--) { > >> drm_syncobj_put(ptr_mask_bits(fences[n].syncobj, 2)); > >> dma_fence_put(fences[n].dma_fence); > >> - kfree(fences[n].chain_fence); > >> + dma_fence_chain_free(fences[n].chain_fence); > >> } > >> kvfree(fences); > >> } > >> @@ -3097,9 +3097,7 @@ add_timeline_fence_array(struct i915_execbuffer = *eb, > >> return -EINVAL; > >> } > >> > >> - f->chain_fence =3D > >> - kmalloc(sizeof(*f->chain_fence), > >> - GFP_KERNEL); > >> + f->chain_fence =3D dma_fence_chain_alloc(); > >> if (!f->chain_fence) { > >> drm_syncobj_put(syncobj); > >> dma_fence_put(fence); > >> diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/ms= m/msm_gem_submit.c > >> index 5480852bdeda..6ff6df6c4791 100644 > >> --- a/drivers/gpu/drm/msm/msm_gem_submit.c > >> +++ b/drivers/gpu/drm/msm/msm_gem_submit.c > >> @@ -586,9 +586,7 @@ static struct msm_submit_post_dep *msm_parse_post_= deps(struct drm_device *dev, > >> break; > >> } > >> > >> - post_deps[i].chain =3D > >> - kmalloc(sizeof(*post_deps[i].chain), > >> - GFP_KERNEL); > >> + post_deps[i].chain =3D dma_fence_chain_alloc(); > >> if (!post_deps[i].chain) { > >> ret =3D -ENOMEM; > >> break; > >> @@ -605,7 +603,7 @@ static struct msm_submit_post_dep *msm_parse_post_= deps(struct drm_device *dev, > >> > >> if (ret) { > >> for (j =3D 0; j <=3D i; ++j) { > >> - kfree(post_deps[j].chain); > >> + dma_fence_chain_free(post_deps[j].chain); > >> if (post_deps[j].syncobj) > >> drm_syncobj_put(post_deps[j].syncobj); > >> } > >> diff --git a/include/linux/dma-fence-chain.h b/include/linux/dma-fence= -chain.h > >> index 9d6a062be640..5f45689a6d2e 100644 > >> --- a/include/linux/dma-fence-chain.h > >> +++ b/include/linux/dma-fence-chain.h > >> @@ -12,6 +12,7 @@ > >> > >> #include > >> #include > >> +#include > >> > >> /** > >> * struct dma_fence_chain - fence to represent an node of a fence ch= ain > >> @@ -53,6 +54,27 @@ to_dma_fence_chain(struct dma_fence *fence) > >> return container_of(fence, struct dma_fence_chain, base); > >> } > >> > >> +/** > >> + * dma_fence_chain_alloc > >> + * > >> + * Returns a new dma_fence_chain object > > ... or NULL on failure. > > > >> + */ > >> +static inline struct dma_fence_chain *dma_fence_chain_alloc(void) > >> +{ > >> + return kmalloc(sizeof(struct dma_fence_chain), GFP_KERNEL); > >> +}; > >> + > >> +/** > >> + * dma_fence_chain_free > >> + * @chain: chain node to free > >> + * > >> + * Frees up an allocated but not used dma_fence_chain node. > >> + */ > >> +static inline void dma_fence_chain_free(struct dma_fence_chain *chain= ) > >> +{ > >> + kfree(chain); > > kfree_rcu, and I guess this means this patch here should be cc: stable. > > Nope, kfree() is correct here. > > This is to free up fences which never been initialized, so an RCU grace > period isn't necessary because nobody could potentially have a reference. Hah I got tricked. I see you have the next revision out there already, I'll drop some suggestions on the kerneldoc so it's clearer what this does and why. -Daniel > Christian. > > > This is kinda why I'm questioning whether this "dma_fence are protected= by > > rcu" cross driver api is really a good idea. We largely get it wrong in > > the details in a _ton_ of places. > > > > With the details fixed: > > > > Reviewed-by: Daniel Vetter > > > >> + > >> /** > >> * dma_fence_chain_for_each - iterate over all fences in chain > >> * @iter: current fence > >> -- > >> 2.25.1 > >> > --=20 Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch 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 X-Spam-Level: X-Spam-Status: No, score=-13.6 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 autolearn=ham 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 A549BC48BE0 for ; Fri, 11 Jun 2021 14:41:14 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org 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