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[209.132.180.67]) by mx.google.com with ESMTP id z1si56547otp.70.2020.02.12.14.00.48; Wed, 12 Feb 2020 14:01:02 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=VsP6gtzR; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729132AbgBLV7n (ORCPT + 99 others); Wed, 12 Feb 2020 16:59:43 -0500 Received: from mail-io1-f65.google.com ([209.85.166.65]:37891 "EHLO mail-io1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729054AbgBLV7m (ORCPT ); Wed, 12 Feb 2020 16:59:42 -0500 Received: by mail-io1-f65.google.com with SMTP id s24so4090212iog.5 for ; Wed, 12 Feb 2020 13:59:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=LC0UttnCWCpaleUnGXV+eggvuz+hBpJbhZZEmNICDAU=; b=VsP6gtzRXVhCUM2EE3UwavBGqPMZmIFM9NLhc4w2fs84XWG6XPlLJMSzVPGwewjTm7 T7mAa0GGJe06Uv4jCwXN+H0VHbX0cvuZZIKCsYPEmUa31mtzbeMS7YOE+91MdnqS4YDp xye1iZAWcqQXlD2Yix4QDWcT8hCHTciU8YWuCaN4803zbvhugGhQ0nsaw29aQ+GfzYH0 O7gagrYpSRwLoCm+8IZrMJgtJdvbULbCZx05qiWPwj48xE/gr5zckZvEDc84ea+9ift0 bWr1UHmIhBdQmU4r3WrWy8fCZyjbFh7EbF10Olc4vnoD6KcOVlwkOC0RM8stUHgUdZek OS8w== 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=LC0UttnCWCpaleUnGXV+eggvuz+hBpJbhZZEmNICDAU=; b=qZq2FmmlIPKz9nqIlT7zhHFFlD3xyWJLNK23i86j4Z4vJwxm/92cJ+azGSI7ME7a7C YbMWr2bAhKTj7WwIgBynTHx8XvS2v0eiYwKNfCnzxhWS8KxSo+nQzaQ4jwGjBEfOLHPx CpV/uA0c1eAFsBInVFm0cVk31uiFagTpq/Nr1HNws0+yAN9olVGCv6nOeSqJXi6v1nFx GxHk3L1l9oGgEaqj/0NAg/tE13VFz5M0NIkYe6MmHHiK8WpofsPYilePRSopIBaVrUYq Ql1QK5rJa0GHvho1v6cnUG89ogRVsMHsMMTS2cFBlX950dHI0TkurelOtn4PGTiOVvsc pf6w== X-Gm-Message-State: APjAAAWWlzPwAgyOcPWJaOYr3pmNvvjhV59VQM4Cw+66OBapYuIenPVy r94MdH3HrVe4O6LgBkHwqngNePOt5+a2+s6sw1VfsQ== X-Received: by 2002:a6b:dc03:: with SMTP id s3mr19536708ioc.50.1581544781534; Wed, 12 Feb 2020 13:59:41 -0800 (PST) MIME-Version: 1.0 References: <527785289.2852303.1581062223707.JavaMail.zimbra@kalray.eu> <20200210162209.23149-1-cleger@kalray.eu> <20200210162209.23149-2-cleger@kalray.eu> <4465bade-e3de-88b8-63a5-e5410de9adc0@st.com> <884697376.3644142.1581439161953.JavaMail.zimbra@kalray.eu> <20200211223715.GA27770@xps15> <296765414.3763778.1581503820255.JavaMail.zimbra@kalray.eu> In-Reply-To: <296765414.3763778.1581503820255.JavaMail.zimbra@kalray.eu> From: Mathieu Poirier Date: Wed, 12 Feb 2020 14:59:30 -0700 Message-ID: Subject: Re: [PATCH v4 1/5] remoteproc: Use u64 len for da_to_va To: =?UTF-8?Q?Cl=C3=A9ment_Leger?= Cc: Arnaud Pouliquen , Ohad Ben-Cohen , Bjorn Andersson , Jonathan Corbet , Shawn Guo , Sascha Hauer , linux-remoteproc , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Andy Gross , Patrice Chotard , linux-doc , linux-kernel , linux-arm-kernel , linux-arm-msm , Loic PALLARDY , s-anna Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 12 Feb 2020 at 03:37, Cl=C3=A9ment Leger wrote: > > Hi Mathieu, > > ----- On 11 Feb, 2020, at 23:37, Mathieu Poirier mathieu.poirier@linaro.o= rg wrote: > > > On Tue, Feb 11, 2020 at 05:39:21PM +0100, Cl=C3=A9ment Leger wrote: > >> Hi Arnaud, > >> > >> ----- On 11 Feb, 2020, at 16:53, Arnaud Pouliquen arnaud.pouliquen@st.= com wrote: > >> > >> > On 2/10/20 5:22 PM, Clement Leger wrote: > >> >> With upcoming changes in elf loader for elf64 support, section size= will > >> >> be a u64. When used with da_to_va, this will potentially lead to > >> >> overflow if using the current "int" type for len argument. Change > >> >> da_to_va prototype to use a u64 for len and fix all users of this > >> >> function. > >> >> > >> >> Signed-off-by: Clement Leger > >> >> --- > >> >> drivers/remoteproc/imx_rproc.c | 11 ++++++----- > >> >> drivers/remoteproc/keystone_remoteproc.c | 4 ++-- > >> >> drivers/remoteproc/qcom_q6v5_adsp.c | 2 +- > >> >> drivers/remoteproc/qcom_q6v5_mss.c | 2 +- > >> >> drivers/remoteproc/qcom_q6v5_pas.c | 2 +- > >> >> drivers/remoteproc/qcom_q6v5_wcss.c | 2 +- > >> >> drivers/remoteproc/qcom_wcnss.c | 2 +- > >> >> drivers/remoteproc/remoteproc_core.c | 2 +- > >> >> drivers/remoteproc/remoteproc_internal.h | 2 +- > >> >> drivers/remoteproc/st_slim_rproc.c | 4 ++-- > >> >> drivers/remoteproc/wkup_m3_rproc.c | 4 ++-- > >> >> include/linux/remoteproc.h | 2 +- > >> >> 12 files changed, 20 insertions(+), 19 deletions(-) > >> >> > >> >> diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/im= x_rproc.c > >> >> index 3e72b6f38d4b..f497f5b49b18 100644 > >> >> --- a/drivers/remoteproc/imx_rproc.c > >> >> +++ b/drivers/remoteproc/imx_rproc.c > >> >> @@ -186,7 +186,7 @@ static int imx_rproc_stop(struct rproc *rproc) > >> >> } > >> >> > >> >> static int imx_rproc_da_to_sys(struct imx_rproc *priv, u64 da, > >> >> - int len, u64 *sys) > >> >> + u64 len, u64 *sys) > >> >> { > >> >> const struct imx_rproc_dcfg *dcfg =3D priv->dcfg; > >> >> int i; > >> >> @@ -203,19 +203,19 @@ static int imx_rproc_da_to_sys(struct imx_rpr= oc *priv, u64 > >> >> da, > >> >> } > >> >> } > >> >> > >> >> - dev_warn(priv->dev, "Translation failed: da =3D 0x%llx len =3D 0x= %x\n", > >> >> + dev_warn(priv->dev, "Translation failed: da =3D 0x%llx len =3D 0x= %llx\n", > >> >> da, len); > >> >> return -ENOENT; > >> >> } > >> >> > >> >> -static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, int l= en) > >> >> +static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, u64 l= en) > >> >> { > >> >> struct imx_rproc *priv =3D rproc->priv; > >> >> void *va =3D NULL; > >> >> u64 sys; > >> >> int i; > >> >> > >> >> - if (len <=3D 0) > >> >> + if (len =3D=3D 0) > >> >> return NULL; > >> >> > >> >> /* > >> >> @@ -235,7 +235,8 @@ static void *imx_rproc_da_to_va(struct rproc *r= proc, u64 da, > >> >> int len) > >> >> } > >> >> } > >> >> > >> >> - dev_dbg(&rproc->dev, "da =3D 0x%llx len =3D 0x%x va =3D 0x%p\n", = da, len, va); > >> >> + dev_dbg(&rproc->dev, "da =3D 0x%llx len =3D 0x%llx va =3D 0x%p\n"= , > >> >> + da, len, va); > >> >> > >> >> return va; > >> >> } > >> >> diff --git a/drivers/remoteproc/keystone_remoteproc.c > >> >> b/drivers/remoteproc/keystone_remoteproc.c > >> >> index 5c4658f00b3d..466093f48814 100644 > >> >> --- a/drivers/remoteproc/keystone_remoteproc.c > >> >> +++ b/drivers/remoteproc/keystone_remoteproc.c > >> >> @@ -246,7 +246,7 @@ static void keystone_rproc_kick(struct rproc *r= proc, int > >> >> vqid) > >> >> * can be used either by the remoteproc core for loading (when usi= ng kernel > >> >> * remoteproc loader), or by any rpmsg bus drivers. > >> >> */ > >> >> -static void *keystone_rproc_da_to_va(struct rproc *rproc, u64 da, = int len) > >> >> +static void *keystone_rproc_da_to_va(struct rproc *rproc, u64 da, = u64 len) > >> >> { > >> >> struct keystone_rproc *ksproc =3D rproc->priv; > >> >> void __iomem *va =3D NULL; > >> >> @@ -255,7 +255,7 @@ static void *keystone_rproc_da_to_va(struct rpr= oc *rproc, > >> >> u64 da, int len) > >> >> size_t size; > >> >> int i; > >> >> > >> >> - if (len <=3D 0) > >> >> + if (len =3D=3D 0) > >> >> return NULL; > >> >> > >> >> for (i =3D 0; i < ksproc->num_mems; i++) { > >> >> diff --git a/drivers/remoteproc/qcom_q6v5_adsp.c > >> >> b/drivers/remoteproc/qcom_q6v5_adsp.c > >> >> index e953886b2eb7..7518e67a49e5 100644 > >> >> --- a/drivers/remoteproc/qcom_q6v5_adsp.c > >> >> +++ b/drivers/remoteproc/qcom_q6v5_adsp.c > >> >> @@ -270,7 +270,7 @@ static int adsp_stop(struct rproc *rproc) > >> >> return ret; > >> >> } > >> >> > >> >> -static void *adsp_da_to_va(struct rproc *rproc, u64 da, int len) > >> >> +static void *adsp_da_to_va(struct rproc *rproc, u64 da, u64 len) > >> >> { > >> >> struct qcom_adsp *adsp =3D (struct qcom_adsp *)rproc->priv; > >> >> int offset; > >> >> diff --git a/drivers/remoteproc/qcom_q6v5_mss.c > >> >> b/drivers/remoteproc/qcom_q6v5_mss.c > >> >> index 471128a2e723..248febde6fc1 100644 > >> >> --- a/drivers/remoteproc/qcom_q6v5_mss.c > >> >> +++ b/drivers/remoteproc/qcom_q6v5_mss.c > >> >> @@ -1148,7 +1148,7 @@ static int q6v5_stop(struct rproc *rproc) > >> >> return 0; > >> >> } > >> >> > >> >> -static void *q6v5_da_to_va(struct rproc *rproc, u64 da, int len) > >> >> +static void *q6v5_da_to_va(struct rproc *rproc, u64 da, u64 len) > >> >> { > >> >> struct q6v5 *qproc =3D rproc->priv; > >> >> int offset; > >> >> diff --git a/drivers/remoteproc/qcom_q6v5_pas.c > >> >> b/drivers/remoteproc/qcom_q6v5_pas.c > >> >> index db4b3c4bacd7..cf2cd609c90d 100644 > >> >> --- a/drivers/remoteproc/qcom_q6v5_pas.c > >> >> +++ b/drivers/remoteproc/qcom_q6v5_pas.c > >> >> @@ -159,7 +159,7 @@ static int adsp_stop(struct rproc *rproc) > >> >> return ret; > >> >> } > >> >> > >> >> -static void *adsp_da_to_va(struct rproc *rproc, u64 da, int len) > >> >> +static void *adsp_da_to_va(struct rproc *rproc, u64 da, u64 len) > >> >> { > >> >> struct qcom_adsp *adsp =3D (struct qcom_adsp *)rproc->priv; > >> >> int offset; > >> >> diff --git a/drivers/remoteproc/qcom_q6v5_wcss.c > >> >> b/drivers/remoteproc/qcom_q6v5_wcss.c > >> >> index f93e1e4a1cc0..3a6b82a16961 100644 > >> >> --- a/drivers/remoteproc/qcom_q6v5_wcss.c > >> >> +++ b/drivers/remoteproc/qcom_q6v5_wcss.c > >> >> @@ -406,7 +406,7 @@ static int q6v5_wcss_stop(struct rproc *rproc) > >> >> return 0; > >> >> } > >> >> > >> >> -static void *q6v5_wcss_da_to_va(struct rproc *rproc, u64 da, int l= en) > >> >> +static void *q6v5_wcss_da_to_va(struct rproc *rproc, u64 da, u64 l= en) > >> >> { > >> >> struct q6v5_wcss *wcss =3D rproc->priv; > >> >> int offset; > >> >> diff --git a/drivers/remoteproc/qcom_wcnss.c b/drivers/remoteproc/q= com_wcnss.c > >> >> index dc135754bb9c..f893219e45a8 100644 > >> >> --- a/drivers/remoteproc/qcom_wcnss.c > >> >> +++ b/drivers/remoteproc/qcom_wcnss.c > >> >> @@ -287,7 +287,7 @@ static int wcnss_stop(struct rproc *rproc) > >> >> return ret; > >> >> } > >> >> > >> >> -static void *wcnss_da_to_va(struct rproc *rproc, u64 da, int len) > >> >> +static void *wcnss_da_to_va(struct rproc *rproc, u64 da, u64 len) > >> >> { > >> >> struct qcom_wcnss *wcnss =3D (struct qcom_wcnss *)rproc->priv; > >> >> int offset; > >> >> diff --git a/drivers/remoteproc/remoteproc_core.c > >> >> b/drivers/remoteproc/remoteproc_core.c > >> >> index 307df98347ba..9e6d3c6a60ee 100644 > >> >> --- a/drivers/remoteproc/remoteproc_core.c > >> >> +++ b/drivers/remoteproc/remoteproc_core.c > >> >> @@ -185,7 +185,7 @@ EXPORT_SYMBOL(rproc_va_to_pa); > >> >> * here the output of the DMA API for the carveouts, which should = be more > >> >> * correct. > >> >> */ > >> >> -void *rproc_da_to_va(struct rproc *rproc, u64 da, int len) > >> >> +void *rproc_da_to_va(struct rproc *rproc, u64 da, u64 len) > >> > > >> > This function is exported, don't see any update in consequence... > >> > references: > >> > https://elixir.bootlin.com/linux/v5.6-rc1/ident/rproc_da_to_va > >> > For instance the function rproc_trace_read use it. it quite strange = that my gcc > >> > does not warns for the cast but i suppose that some could. > >> > >> Agreed, even if len should never have been a signed type since it can'= t be > >> negative. I will try to fix all callers. > >> > >> > An indirect consequence is that the len field in rproc_mem_entry str= uct should > >> > probably been updated to u64 to be aligned. > >> > >> Ok, I will do that once we settle on the type of len. > >> > >> > > >> > I'm still wondering about the use of size_t instead,which seems more= rational > >> > from my window. > >> > So i you or Mathieu remember it was decided to use u64, please could= remind me > >> > the arguments? > >> > >> I tried to find the notes of a meeting we had for OpenAMP but I did no= t found > >> them. Anyway, the argument was coming from Tomas or someone else, (I c= an't > >> remember) talking about a 32 bits CPU executing code on a 64 bits acce= lerator. > >> In that case, the size_t type could fail due to being only 32bits on t= he host > >> CPU but larger than 4G. > >> > >> However, I can't say if it's a real usecase or not... All I can say is > >> that keeping it open is probably better if one day somebody comes with= such > >> architecture. > > > > In order to support a 32bit AP with a 64bit MCU we'd also have to deal = with all > > the dma_attr_t in the structure we use. > > Totally ok with that... > > > > > Also something that became very clear to me while thinking about this p= atchset > > is that supporting elf64 does __not__ mean we support 64bit MCU. As lo= ng as > > the addresses conveyed by the elf64 image fit within 32 bits we are fin= e. > > Supporting 64bit MCUs is a completely different topic, one that will de= mand > > serious refactoring. > > Exactly, an elf64 can potentially contain an executable fitting in 32 bit= s. > > > > > So moving from "int len" to "u64 len" doesn't give us much. It doesn't= hurt to > > do it but if @len ever becomes bigger than 31 bits we'll have other pro= blems to > > deal with. > > Agreed, so what would be your recommendation reagrding the type of len ? > I'm ok with Arnaud statement too and using a size_t is probably more > "type-safe" than a u64. At least it adds some information. If @len becomes big enough that it doesn't fit in 31bit then it is very likely that things will break even before we get to call rproc_da_to_va(). Fixing it here is possible but will introduce a fair amount of ripple effect that we probably don't want to deal with right now. Other people might feel more opinionated on this but as far as I'm concerned, I would keep it as it is and fix it for real when the time comes to add support for 64bit MCUs. > > Thanks, > > Cl=C3=A9ment > > > > >> > >> > As an alternative a check should be added for 32 bits processors to = ensure that > >> > the size is not higher than > >> > its address range capability... > >> > >> Agreed. > >> I was even thinking about a mecanism for remoteproc drivers to declare= the type > >> of supported elfs files (such as EM_*, ELFCLASS* and other needed thin= g). > >> Or should it be supported by overriding .sanity_check in drivers to r= eject > >> elf64 for instance ? > >> > >> Since elf is a "specific format" and that rproc can support other form= ats, > >> I did not want to add a specific elf_sanity_check field to rproc ops. > >> > >> Regards, > >> > >> Cl=C3=A9ment > >> > >> > > >> > Regards > >> > Arnaud > >> > > >> >> { > >> >> struct rproc_mem_entry *carveout; > >> >> void *ptr =3D NULL; > >> >> diff --git a/drivers/remoteproc/remoteproc_internal.h > >> >> b/drivers/remoteproc/remoteproc_internal.h > >> >> index 493ef9262411..004867061721 100644 > >> >> --- a/drivers/remoteproc/remoteproc_internal.h > >> >> +++ b/drivers/remoteproc/remoteproc_internal.h > >> >> @@ -50,7 +50,7 @@ void rproc_exit_sysfs(void); > >> >> void rproc_free_vring(struct rproc_vring *rvring); > >> >> int rproc_alloc_vring(struct rproc_vdev *rvdev, int i); > >> >> > >> >> -void *rproc_da_to_va(struct rproc *rproc, u64 da, int len); > >> >> +void *rproc_da_to_va(struct rproc *rproc, u64 da, u64 len); > >> >> phys_addr_t rproc_va_to_pa(void *cpu_addr); > >> >> int rproc_trigger_recovery(struct rproc *rproc); > >> >> > >> >> diff --git a/drivers/remoteproc/st_slim_rproc.c > >> >> b/drivers/remoteproc/st_slim_rproc.c > >> >> index 04492fead3c8..fc01cd879b60 100644 > >> >> --- a/drivers/remoteproc/st_slim_rproc.c > >> >> +++ b/drivers/remoteproc/st_slim_rproc.c > >> >> @@ -174,7 +174,7 @@ static int slim_rproc_stop(struct rproc *rproc) > >> >> return 0; > >> >> } > >> >> > >> >> -static void *slim_rproc_da_to_va(struct rproc *rproc, u64 da, int = len) > >> >> +static void *slim_rproc_da_to_va(struct rproc *rproc, u64 da, u64 = len) > >> >> { > >> >> struct st_slim_rproc *slim_rproc =3D rproc->priv; > >> >> void *va =3D NULL; > >> >> @@ -191,7 +191,7 @@ static void *slim_rproc_da_to_va(struct rproc *= rproc, u64 > >> >> da, int len) > >> >> } > >> >> } > >> >> > >> >> - dev_dbg(&rproc->dev, "da =3D 0x%llx len =3D 0x%x va =3D 0x%pK\n", > >> >> + dev_dbg(&rproc->dev, "da =3D 0x%llx len =3D 0x%llx va =3D 0x%pK\n= ", > >> >> da, len, va); > >> >> > >> >> return va; > >> >> diff --git a/drivers/remoteproc/wkup_m3_rproc.c > >> >> b/drivers/remoteproc/wkup_m3_rproc.c > >> >> index 3984e585c847..91485b467407 100644 > >> >> --- a/drivers/remoteproc/wkup_m3_rproc.c > >> >> +++ b/drivers/remoteproc/wkup_m3_rproc.c > >> >> @@ -80,14 +80,14 @@ static int wkup_m3_rproc_stop(struct rproc *rpr= oc) > >> >> return 0; > >> >> } > >> >> > >> >> -static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, i= nt len) > >> >> +static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, u= 64 len) > >> >> { > >> >> struct wkup_m3_rproc *wkupm3 =3D rproc->priv; > >> >> void *va =3D NULL; > >> >> int i; > >> >> u32 offset; > >> >> > >> >> - if (len <=3D 0) > >> >> + if (len =3D=3D 0) > >> >> return NULL; > >> >> > >> >> for (i =3D 0; i < WKUPM3_MEM_MAX; i++) { > >> >> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.= h > >> >> index 16ad66683ad0..f84bd5fe0211 100644 > >> >> --- a/include/linux/remoteproc.h > >> >> +++ b/include/linux/remoteproc.h > >> >> @@ -374,7 +374,7 @@ struct rproc_ops { > >> >> int (*start)(struct rproc *rproc); > >> >> int (*stop)(struct rproc *rproc); > >> >> void (*kick)(struct rproc *rproc, int vqid); > >> >> - void * (*da_to_va)(struct rproc *rproc, u64 da, int len); > >> >> + void * (*da_to_va)(struct rproc *rproc, u64 da, u64 len); > >> >> int (*parse_fw)(struct rproc *rproc, const struct firmware *fw); > >> >> int (*handle_rsc)(struct rproc *rproc, u32 rsc_type, void *rsc, > > > >> int offset, int avail);