[v4,1/5] remoteproc: Use u64 len for da_to_va

Message ID	20200210162209.23149-2-cleger@kalray.eu (mailing list archive)
State	New, archived
Headers	show Return-Path: <SRS0=ZxXb=36=vger.kernel.org=linux-remoteproc-owner@kernel.org> From: Clement Leger <cleger@kalray.eu> To: Ohad Ben-Cohen <ohad@wizery.com>, Bjorn Andersson <bjorn.andersson@linaro.org>, Jonathan Corbet <corbet@lwn.net>, Shawn Guo <shawnguo@kernel.org>, Sascha Hauer <s.hauer@pengutronix.de>, linux-remoteproc@vger.kernel.org Cc: Pengutronix Kernel Team <kernel@pengutronix.de>, Fabio Estevam <festevam@gmail.com>, NXP Linux Team <linux-imx@nxp.com>, Andy Gross <agross@kernel.org>, Patrice Chotard <patrice.chotard@st.com>, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, Arnaud Pouliquen <arnaud.pouliquen@st.com>, Loic PALLARDY <loic.pallardy@st.com>, s-anna <s-anna@ti.com>, Mathieu Poirier <mathieu.poirier@linaro.org>, Clement Leger <cleger@kalray.eu> Subject: [PATCH v4 1/5] remoteproc: Use u64 len for da_to_va Date: Mon, 10 Feb 2020 17:22:05 +0100 Message-Id: <20200210162209.23149-2-cleger@kalray.eu> In-Reply-To: <20200210162209.23149-1-cleger@kalray.eu> References: <527785289.2852303.1581062223707.JavaMail.zimbra@kalray.eu> <20200210162209.23149-1-cleger@kalray.eu> Sender: linux-remoteproc-owner@vger.kernel.org Precedence: bulk
Series	remoteproc: Add elf64 support \| expand [v4,0/5] remoteproc: Add elf64 support [v4,1/5] remoteproc: Use u64 len for da_to_va [v4,2/5] remoteproc: Use u64 type for boot_addr [v4,3/5] remoteproc: Add elf helpers to access elf64 and elf32 fields [v4,4/5] remoteproc: Add elf64 support in elf loader [v4,5/5] remoteproc: Adapt coredump to generate correct elf type [v5,6/8] remoteproc: Add elf64 support in elf loader [v5,7/8] remoteproc: Allow overriding only sanity_check [v5,8/8] remoteproc: Adapt coredump to generate correct elf type

Clément Leger Feb. 10, 2020, 4:22 p.m. UTC

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 <cleger@kalray.eu>
---
 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(-)

Arnaud POULIQUEN Feb. 11, 2020, 3:53 p.m. UTC | #1

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 <cleger@kalray.eu>
> ---
>  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/imx_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 = priv->dcfg;
>  	int i;
> @@ -203,19 +203,19 @@ static int imx_rproc_da_to_sys(struct imx_rproc *priv, u64 da,
>  		}
>  	}
>  
> -	dev_warn(priv->dev, "Translation failed: da = 0x%llx len = 0x%x\n",
> +	dev_warn(priv->dev, "Translation failed: da = 0x%llx len = 0x%llx\n",
>  		 da, len);
>  	return -ENOENT;
>  }
>  
> -static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
> +static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, u64 len)
>  {
>  	struct imx_rproc *priv = rproc->priv;
>  	void *va = NULL;
>  	u64 sys;
>  	int i;
>  
> -	if (len <= 0)
> +	if (len == 0)
>  		return NULL;
>  
>  	/*
> @@ -235,7 +235,8 @@ static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
>  		}
>  	}
>  
> -	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%x va = 0x%p\n", da, len, va);
> +	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%llx va = 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 *rproc, int vqid)
>   * can be used either by the remoteproc core for loading (when using 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 = rproc->priv;
>  	void __iomem *va = NULL;
> @@ -255,7 +255,7 @@ static void *keystone_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
>  	size_t size;
>  	int i;
>  
> -	if (len <= 0)
> +	if (len == 0)
>  		return NULL;
>  
>  	for (i = 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 = (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 = 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 = (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 len)
> +static void *q6v5_wcss_da_to_va(struct rproc *rproc, u64 da, u64 len)
>  {
>  	struct q6v5_wcss *wcss = rproc->priv;
>  	int offset;
> diff --git a/drivers/remoteproc/qcom_wcnss.c b/drivers/remoteproc/qcom_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 = (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.
An indirect consequence is that the len field in rproc_mem_entry struct should probably been updated to u64 to be aligned.

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?
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...  

Regards
Arnaud  
 
>  {
>  	struct rproc_mem_entry *carveout;
>  	void *ptr = 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 = rproc->priv;
>  	void *va = NULL;
> @@ -191,7 +191,7 @@ static void *slim_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
>  		}
>  	}
>  
> -	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%x va = 0x%pK\n",
> +	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%llx va = 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 *rproc)
>  	return 0;
>  }
>  
> -static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
> +static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, u64 len)
>  {
>  	struct wkup_m3_rproc *wkupm3 = rproc->priv;
>  	void *va = NULL;
>  	int i;
>  	u32 offset;
>  
> -	if (len <= 0)
> +	if (len == 0)
>  		return NULL;
>  
>  	for (i = 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);
>

Clément Leger Feb. 11, 2020, 4:39 p.m. UTC | #2

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 <cleger@kalray.eu>
>> ---
>>  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/imx_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 = priv->dcfg;
>>  	int i;
>> @@ -203,19 +203,19 @@ static int imx_rproc_da_to_sys(struct imx_rproc *priv, u64
>> da,
>>  		}
>>  	}
>>  
>> -	dev_warn(priv->dev, "Translation failed: da = 0x%llx len = 0x%x\n",
>> +	dev_warn(priv->dev, "Translation failed: da = 0x%llx len = 0x%llx\n",
>>  		 da, len);
>>  	return -ENOENT;
>>  }
>>  
>> -static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
>> +static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, u64 len)
>>  {
>>  	struct imx_rproc *priv = rproc->priv;
>>  	void *va = NULL;
>>  	u64 sys;
>>  	int i;
>>  
>> -	if (len <= 0)
>> +	if (len == 0)
>>  		return NULL;
>>  
>>  	/*
>> @@ -235,7 +235,8 @@ static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da,
>> int len)
>>  		}
>>  	}
>>  
>> -	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%x va = 0x%p\n", da, len, va);
>> +	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%llx va = 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 *rproc, int
>> vqid)
>>   * can be used either by the remoteproc core for loading (when using 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 = rproc->priv;
>>  	void __iomem *va = NULL;
>> @@ -255,7 +255,7 @@ static void *keystone_rproc_da_to_va(struct rproc *rproc,
>> u64 da, int len)
>>  	size_t size;
>>  	int i;
>>  
>> -	if (len <= 0)
>> +	if (len == 0)
>>  		return NULL;
>>  
>>  	for (i = 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 = (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 = 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 = (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 len)
>> +static void *q6v5_wcss_da_to_va(struct rproc *rproc, u64 da, u64 len)
>>  {
>>  	struct q6v5_wcss *wcss = rproc->priv;
>>  	int offset;
>> diff --git a/drivers/remoteproc/qcom_wcnss.c b/drivers/remoteproc/qcom_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 = (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 struct 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 not found
them. Anyway, the argument was coming from Tomas or someone else, (I can't
remember) talking about a 32 bits CPU executing code on a 64 bits accelerator.
In that case, the size_t type could fail due to being only 32bits on the 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.

> 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 thing).
Or should it be supported by overriding .sanity_check in drivers  to reject
elf64 for instance ?

Since elf is a "specific format" and that rproc can support other formats,
I did not want to add a specific elf_sanity_check field to rproc ops.

Regards,

Clément

> 
> Regards
> Arnaud
> 
>>  {
>>  	struct rproc_mem_entry *carveout;
>>  	void *ptr = 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 = rproc->priv;
>>  	void *va = NULL;
>> @@ -191,7 +191,7 @@ static void *slim_rproc_da_to_va(struct rproc *rproc, u64
>> da, int len)
>>  		}
>>  	}
>>  
>> -	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%x va = 0x%pK\n",
>> +	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%llx va = 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 *rproc)
>>  	return 0;
>>  }
>>  
>> -static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
>> +static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, u64 len)
>>  {
>>  	struct wkup_m3_rproc *wkupm3 = rproc->priv;
>>  	void *va = NULL;
>>  	int i;
>>  	u32 offset;
>>  
>> -	if (len <= 0)
>> +	if (len == 0)
>>  		return NULL;
>>  
>>  	for (i = 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);

Arnaud POULIQUEN Feb. 11, 2020, 5:24 p.m. UTC | #3

On 2/11/20 5:39 PM, Clément 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 <cleger@kalray.eu>
>>> ---
>>>  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/imx_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 = priv->dcfg;
>>>  	int i;
>>> @@ -203,19 +203,19 @@ static int imx_rproc_da_to_sys(struct imx_rproc *priv, u64
>>> da,
>>>  		}
>>>  	}
>>>  
>>> -	dev_warn(priv->dev, "Translation failed: da = 0x%llx len = 0x%x\n",
>>> +	dev_warn(priv->dev, "Translation failed: da = 0x%llx len = 0x%llx\n",
>>>  		 da, len);
>>>  	return -ENOENT;
>>>  }
>>>  
>>> -static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
>>> +static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, u64 len)
>>>  {
>>>  	struct imx_rproc *priv = rproc->priv;
>>>  	void *va = NULL;
>>>  	u64 sys;
>>>  	int i;
>>>  
>>> -	if (len <= 0)
>>> +	if (len == 0)
>>>  		return NULL;
>>>  
>>>  	/*
>>> @@ -235,7 +235,8 @@ static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da,
>>> int len)
>>>  		}
>>>  	}
>>>  
>>> -	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%x va = 0x%p\n", da, len, va);
>>> +	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%llx va = 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 *rproc, int
>>> vqid)
>>>   * can be used either by the remoteproc core for loading (when using 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 = rproc->priv;
>>>  	void __iomem *va = NULL;
>>> @@ -255,7 +255,7 @@ static void *keystone_rproc_da_to_va(struct rproc *rproc,
>>> u64 da, int len)
>>>  	size_t size;
>>>  	int i;
>>>  
>>> -	if (len <= 0)
>>> +	if (len == 0)
>>>  		return NULL;
>>>  
>>>  	for (i = 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 = (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 = 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 = (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 len)
>>> +static void *q6v5_wcss_da_to_va(struct rproc *rproc, u64 da, u64 len)
>>>  {
>>>  	struct q6v5_wcss *wcss = rproc->priv;
>>>  	int offset;
>>> diff --git a/drivers/remoteproc/qcom_wcnss.c b/drivers/remoteproc/qcom_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 = (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 struct 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 not found
> them. Anyway, the argument was coming from Tomas or someone else, (I can't
> remember) talking about a 32 bits CPU executing code on a 64 bits accelerator.
> In that case, the size_t type could fail due to being only 32bits on the 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.
> 
>> 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 thing).
> Or should it be supported by overriding .sanity_check in drivers  to reject
> elf64 for instance ?
> 
> Since elf is a "specific format" and that rproc can support other formats,
> I did not want to add a specific elf_sanity_check field to rproc ops.
Agree, platform driver as to check the format it can support, elf, bin, properitay format....
To check the size, the da_to_va ops seems a good candidate as called for loaded segments and memories.
So ok to delegate the check to the platform driver.

Regards
Arnaud

> 
> Regards,
> 
> Clément
> 
>>
>> Regards
>> Arnaud
>>
>>>  {
>>>  	struct rproc_mem_entry *carveout;
>>>  	void *ptr = 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 = rproc->priv;
>>>  	void *va = NULL;
>>> @@ -191,7 +191,7 @@ static void *slim_rproc_da_to_va(struct rproc *rproc, u64
>>> da, int len)
>>>  		}
>>>  	}
>>>  
>>> -	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%x va = 0x%pK\n",
>>> +	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%llx va = 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 *rproc)
>>>  	return 0;
>>>  }
>>>  
>>> -static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
>>> +static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, u64 len)
>>>  {
>>>  	struct wkup_m3_rproc *wkupm3 = rproc->priv;
>>>  	void *va = NULL;
>>>  	int i;
>>>  	u32 offset;
>>>  
>>> -	if (len <= 0)
>>> +	if (len == 0)
>>>  		return NULL;
>>>  
>>>  	for (i = 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);

Mathieu Poirier Feb. 11, 2020, 10:37 p.m. UTC | #4

On Tue, Feb 11, 2020 at 05:39:21PM +0100, Clément 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 <cleger@kalray.eu>
> >> ---
> >>  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/imx_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 = priv->dcfg;
> >>  	int i;
> >> @@ -203,19 +203,19 @@ static int imx_rproc_da_to_sys(struct imx_rproc *priv, u64
> >> da,
> >>  		}
> >>  	}
> >>  
> >> -	dev_warn(priv->dev, "Translation failed: da = 0x%llx len = 0x%x\n",
> >> +	dev_warn(priv->dev, "Translation failed: da = 0x%llx len = 0x%llx\n",
> >>  		 da, len);
> >>  	return -ENOENT;
> >>  }
> >>  
> >> -static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
> >> +static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, u64 len)
> >>  {
> >>  	struct imx_rproc *priv = rproc->priv;
> >>  	void *va = NULL;
> >>  	u64 sys;
> >>  	int i;
> >>  
> >> -	if (len <= 0)
> >> +	if (len == 0)
> >>  		return NULL;
> >>  
> >>  	/*
> >> @@ -235,7 +235,8 @@ static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da,
> >> int len)
> >>  		}
> >>  	}
> >>  
> >> -	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%x va = 0x%p\n", da, len, va);
> >> +	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%llx va = 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 *rproc, int
> >> vqid)
> >>   * can be used either by the remoteproc core for loading (when using 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 = rproc->priv;
> >>  	void __iomem *va = NULL;
> >> @@ -255,7 +255,7 @@ static void *keystone_rproc_da_to_va(struct rproc *rproc,
> >> u64 da, int len)
> >>  	size_t size;
> >>  	int i;
> >>  
> >> -	if (len <= 0)
> >> +	if (len == 0)
> >>  		return NULL;
> >>  
> >>  	for (i = 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 = (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 = 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 = (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 len)
> >> +static void *q6v5_wcss_da_to_va(struct rproc *rproc, u64 da, u64 len)
> >>  {
> >>  	struct q6v5_wcss *wcss = rproc->priv;
> >>  	int offset;
> >> diff --git a/drivers/remoteproc/qcom_wcnss.c b/drivers/remoteproc/qcom_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 = (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 struct 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 not found
> them. Anyway, the argument was coming from Tomas or someone else, (I can't
> remember) talking about a 32 bits CPU executing code on a 64 bits accelerator.
> In that case, the size_t type could fail due to being only 32bits on the 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.

Also something that became very clear to me while thinking about this patchset
is that supporting elf64 does __not__ mean we support 64bit MCU.  As long as
the addresses conveyed by the elf64 image fit within 32 bits we are fine.
Supporting 64bit MCUs is a completely different topic, one that will demand
serious refactoring. 

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 problems to
deal with. 

> 
> > 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 thing).
> Or should it be supported by overriding .sanity_check in drivers  to reject
> elf64 for instance ?
> 
> Since elf is a "specific format" and that rproc can support other formats,
> I did not want to add a specific elf_sanity_check field to rproc ops.
> 
> Regards,
> 
> Clément
> 
> > 
> > Regards
> > Arnaud
> > 
> >>  {
> >>  	struct rproc_mem_entry *carveout;
> >>  	void *ptr = 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 = rproc->priv;
> >>  	void *va = NULL;
> >> @@ -191,7 +191,7 @@ static void *slim_rproc_da_to_va(struct rproc *rproc, u64
> >> da, int len)
> >>  		}
> >>  	}
> >>  
> >> -	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%x va = 0x%pK\n",
> >> +	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%llx va = 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 *rproc)
> >>  	return 0;
> >>  }
> >>  
> >> -static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
> >> +static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, u64 len)
> >>  {
> >>  	struct wkup_m3_rproc *wkupm3 = rproc->priv;
> >>  	void *va = NULL;
> >>  	int i;
> >>  	u32 offset;
> >>  
> >> -	if (len <= 0)
> >> +	if (len == 0)
> >>  		return NULL;
> >>  
> >>  	for (i = 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);

Clément Leger Feb. 12, 2020, 10:37 a.m. UTC | #5

Hi Mathieu,

----- On 11 Feb, 2020, at 23:37, Mathieu Poirier mathieu.poirier@linaro.org wrote:

> On Tue, Feb 11, 2020 at 05:39:21PM +0100, Clément 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 <cleger@kalray.eu>
>> >> ---
>> >>  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/imx_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 = priv->dcfg;
>> >>  	int i;
>> >> @@ -203,19 +203,19 @@ static int imx_rproc_da_to_sys(struct imx_rproc *priv, u64
>> >> da,
>> >>  		}
>> >>  	}
>> >>  
>> >> -	dev_warn(priv->dev, "Translation failed: da = 0x%llx len = 0x%x\n",
>> >> +	dev_warn(priv->dev, "Translation failed: da = 0x%llx len = 0x%llx\n",
>> >>  		 da, len);
>> >>  	return -ENOENT;
>> >>  }
>> >>  
>> >> -static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
>> >> +static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, u64 len)
>> >>  {
>> >>  	struct imx_rproc *priv = rproc->priv;
>> >>  	void *va = NULL;
>> >>  	u64 sys;
>> >>  	int i;
>> >>  
>> >> -	if (len <= 0)
>> >> +	if (len == 0)
>> >>  		return NULL;
>> >>  
>> >>  	/*
>> >> @@ -235,7 +235,8 @@ static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da,
>> >> int len)
>> >>  		}
>> >>  	}
>> >>  
>> >> -	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%x va = 0x%p\n", da, len, va);
>> >> +	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%llx va = 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 *rproc, int
>> >> vqid)
>> >>   * can be used either by the remoteproc core for loading (when using 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 = rproc->priv;
>> >>  	void __iomem *va = NULL;
>> >> @@ -255,7 +255,7 @@ static void *keystone_rproc_da_to_va(struct rproc *rproc,
>> >> u64 da, int len)
>> >>  	size_t size;
>> >>  	int i;
>> >>  
>> >> -	if (len <= 0)
>> >> +	if (len == 0)
>> >>  		return NULL;
>> >>  
>> >>  	for (i = 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 = (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 = 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 = (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 len)
>> >> +static void *q6v5_wcss_da_to_va(struct rproc *rproc, u64 da, u64 len)
>> >>  {
>> >>  	struct q6v5_wcss *wcss = rproc->priv;
>> >>  	int offset;
>> >> diff --git a/drivers/remoteproc/qcom_wcnss.c b/drivers/remoteproc/qcom_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 = (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 struct 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 not found
>> them. Anyway, the argument was coming from Tomas or someone else, (I can't
>> remember) talking about a 32 bits CPU executing code on a 64 bits accelerator.
>> In that case, the size_t type could fail due to being only 32bits on the 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 patchset
> is that supporting elf64 does __not__ mean we support 64bit MCU.  As long as
> the addresses conveyed by the elf64 image fit within 32 bits we are fine.
> Supporting 64bit MCUs is a completely different topic, one that will demand
> serious refactoring.

Exactly, an elf64 can potentially contain an executable fitting in 32 bits.

> 
> 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 problems 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.

Thanks,

Clément

> 
>> 
>> > 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 thing).
>> Or should it be supported by overriding .sanity_check in drivers  to reject
>> elf64 for instance ?
>> 
>> Since elf is a "specific format" and that rproc can support other formats,
>> I did not want to add a specific elf_sanity_check field to rproc ops.
>> 
>> Regards,
>> 
>> Clément
>> 
>> > 
>> > Regards
>> > Arnaud
>> > 
>> >>  {
>> >>  	struct rproc_mem_entry *carveout;
>> >>  	void *ptr = 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 = rproc->priv;
>> >>  	void *va = NULL;
>> >> @@ -191,7 +191,7 @@ static void *slim_rproc_da_to_va(struct rproc *rproc, u64
>> >> da, int len)
>> >>  		}
>> >>  	}
>> >>  
>> >> -	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%x va = 0x%pK\n",
>> >> +	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%llx va = 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 *rproc)
>> >>  	return 0;
>> >>  }
>> >>  
>> >> -static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
>> >> +static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, u64 len)
>> >>  {
>> >>  	struct wkup_m3_rproc *wkupm3 = rproc->priv;
>> >>  	void *va = NULL;
>> >>  	int i;
>> >>  	u32 offset;
>> >>  
>> >> -	if (len <= 0)
>> >> +	if (len == 0)
>> >>  		return NULL;
>> >>  
>> >>  	for (i = 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);

Mathieu Poirier Feb. 12, 2020, 9:59 p.m. UTC | #6

On Wed, 12 Feb 2020 at 03:37, Clément Leger <cleger@kalray.eu> wrote:
>
> Hi Mathieu,
>
> ----- On 11 Feb, 2020, at 23:37, Mathieu Poirier mathieu.poirier@linaro.org wrote:
>
> > On Tue, Feb 11, 2020 at 05:39:21PM +0100, Clément 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 <cleger@kalray.eu>
> >> >> ---
> >> >>  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/imx_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 = priv->dcfg;
> >> >>   int i;
> >> >> @@ -203,19 +203,19 @@ static int imx_rproc_da_to_sys(struct imx_rproc *priv, u64
> >> >> da,
> >> >>           }
> >> >>   }
> >> >>
> >> >> - dev_warn(priv->dev, "Translation failed: da = 0x%llx len = 0x%x\n",
> >> >> + dev_warn(priv->dev, "Translation failed: da = 0x%llx len = 0x%llx\n",
> >> >>            da, len);
> >> >>   return -ENOENT;
> >> >>  }
> >> >>
> >> >> -static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
> >> >> +static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, u64 len)
> >> >>  {
> >> >>   struct imx_rproc *priv = rproc->priv;
> >> >>   void *va = NULL;
> >> >>   u64 sys;
> >> >>   int i;
> >> >>
> >> >> - if (len <= 0)
> >> >> + if (len == 0)
> >> >>           return NULL;
> >> >>
> >> >>   /*
> >> >> @@ -235,7 +235,8 @@ static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da,
> >> >> int len)
> >> >>           }
> >> >>   }
> >> >>
> >> >> - dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%x va = 0x%p\n", da, len, va);
> >> >> + dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%llx va = 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 *rproc, int
> >> >> vqid)
> >> >>   * can be used either by the remoteproc core for loading (when using 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 = rproc->priv;
> >> >>   void __iomem *va = NULL;
> >> >> @@ -255,7 +255,7 @@ static void *keystone_rproc_da_to_va(struct rproc *rproc,
> >> >> u64 da, int len)
> >> >>   size_t size;
> >> >>   int i;
> >> >>
> >> >> - if (len <= 0)
> >> >> + if (len == 0)
> >> >>           return NULL;
> >> >>
> >> >>   for (i = 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 = (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 = 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 = (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 len)
> >> >> +static void *q6v5_wcss_da_to_va(struct rproc *rproc, u64 da, u64 len)
> >> >>  {
> >> >>   struct q6v5_wcss *wcss = rproc->priv;
> >> >>   int offset;
> >> >> diff --git a/drivers/remoteproc/qcom_wcnss.c b/drivers/remoteproc/qcom_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 = (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 struct 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 not found
> >> them. Anyway, the argument was coming from Tomas or someone else, (I can't
> >> remember) talking about a 32 bits CPU executing code on a 64 bits accelerator.
> >> In that case, the size_t type could fail due to being only 32bits on the 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 patchset
> > is that supporting elf64 does __not__ mean we support 64bit MCU.  As long as
> > the addresses conveyed by the elf64 image fit within 32 bits we are fine.
> > Supporting 64bit MCUs is a completely different topic, one that will demand
> > serious refactoring.
>
> Exactly, an elf64 can potentially contain an executable fitting in 32 bits.
>
> >
> > 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 problems 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,
>
> Clément
>
> >
> >>
> >> > 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 thing).
> >> Or should it be supported by overriding .sanity_check in drivers  to reject
> >> elf64 for instance ?
> >>
> >> Since elf is a "specific format" and that rproc can support other formats,
> >> I did not want to add a specific elf_sanity_check field to rproc ops.
> >>
> >> Regards,
> >>
> >> Clément
> >>
> >> >
> >> > Regards
> >> > Arnaud
> >> >
> >> >>  {
> >> >>   struct rproc_mem_entry *carveout;
> >> >>   void *ptr = 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 = rproc->priv;
> >> >>   void *va = NULL;
> >> >> @@ -191,7 +191,7 @@ static void *slim_rproc_da_to_va(struct rproc *rproc, u64
> >> >> da, int len)
> >> >>           }
> >> >>   }
> >> >>
> >> >> - dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%x va = 0x%pK\n",
> >> >> + dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%llx va = 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 *rproc)
> >> >>   return 0;
> >> >>  }
> >> >>
> >> >> -static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
> >> >> +static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, u64 len)
> >> >>  {
> >> >>   struct wkup_m3_rproc *wkupm3 = rproc->priv;
> >> >>   void *va = NULL;
> >> >>   int i;
> >> >>   u32 offset;
> >> >>
> >> >> - if (len <= 0)
> >> >> + if (len == 0)
> >> >>           return NULL;
> >> >>
> >> >>   for (i = 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);

Clément Leger Feb. 18, 2020, 10:10 a.m. UTC | #7

Hi Mathieu,

----- On 12 Feb, 2020, at 22:59, Mathieu Poirier mathieu.poirier@linaro.org wrote:

> On Wed, 12 Feb 2020 at 03:37, Clément Leger <cleger@kalray.eu> wrote:
>>
>> Hi Mathieu,
>>
>> ----- On 11 Feb, 2020, at 23:37, Mathieu Poirier mathieu.poirier@linaro.org
>> wrote:
>>
>> > On Tue, Feb 11, 2020 at 05:39:21PM +0100, Clément 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 <cleger@kalray.eu>
>> >> >> ---
>> >> >>  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/imx_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 = priv->dcfg;
>> >> >>   int i;
>> >> >> @@ -203,19 +203,19 @@ static int imx_rproc_da_to_sys(struct imx_rproc *priv, u64
>> >> >> da,
>> >> >>           }
>> >> >>   }
>> >> >>
>> >> >> - dev_warn(priv->dev, "Translation failed: da = 0x%llx len = 0x%x\n",
>> >> >> + dev_warn(priv->dev, "Translation failed: da = 0x%llx len = 0x%llx\n",
>> >> >>            da, len);
>> >> >>   return -ENOENT;
>> >> >>  }
>> >> >>
>> >> >> -static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
>> >> >> +static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, u64 len)
>> >> >>  {
>> >> >>   struct imx_rproc *priv = rproc->priv;
>> >> >>   void *va = NULL;
>> >> >>   u64 sys;
>> >> >>   int i;
>> >> >>
>> >> >> - if (len <= 0)
>> >> >> + if (len == 0)
>> >> >>           return NULL;
>> >> >>
>> >> >>   /*
>> >> >> @@ -235,7 +235,8 @@ static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da,
>> >> >> int len)
>> >> >>           }
>> >> >>   }
>> >> >>
>> >> >> - dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%x va = 0x%p\n", da, len, va);
>> >> >> + dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%llx va = 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 *rproc, int
>> >> >> vqid)
>> >> >>   * can be used either by the remoteproc core for loading (when using 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 = rproc->priv;
>> >> >>   void __iomem *va = NULL;
>> >> >> @@ -255,7 +255,7 @@ static void *keystone_rproc_da_to_va(struct rproc *rproc,
>> >> >> u64 da, int len)
>> >> >>   size_t size;
>> >> >>   int i;
>> >> >>
>> >> >> - if (len <= 0)
>> >> >> + if (len == 0)
>> >> >>           return NULL;
>> >> >>
>> >> >>   for (i = 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 = (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 = 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 = (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 len)
>> >> >> +static void *q6v5_wcss_da_to_va(struct rproc *rproc, u64 da, u64 len)
>> >> >>  {
>> >> >>   struct q6v5_wcss *wcss = rproc->priv;
>> >> >>   int offset;
>> >> >> diff --git a/drivers/remoteproc/qcom_wcnss.c b/drivers/remoteproc/qcom_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 = (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 struct 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 not found
>> >> them. Anyway, the argument was coming from Tomas or someone else, (I can't
>> >> remember) talking about a 32 bits CPU executing code on a 64 bits accelerator.
>> >> In that case, the size_t type could fail due to being only 32bits on the 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 patchset
>> > is that supporting elf64 does __not__ mean we support 64bit MCU.  As long as
>> > the addresses conveyed by the elf64 image fit within 32 bits we are fine.
>> > Supporting 64bit MCUs is a completely different topic, one that will demand
>> > serious refactoring.
>>
>> Exactly, an elf64 can potentially contain an executable fitting in 32 bits.
>>
>> >
>> > 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 problems 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.

I did the modification using u64 and tried to follow various code path.
Some end up in dma_alloc_coherent which uses a size_t member. Since
these might be called by rproc with a u64 len, I would be more
inclined to use a size_t. I can probably also add a check in elf loader
which verifies that if sizeof(size_t) < sizeof(u64), then the len must
fit in 32bits. This seems more clean IMHO.

Clément.

> 
> 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,
>>
>> Clément
>>
>> >
>> >>
>> >> > 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 thing).
>> >> Or should it be supported by overriding .sanity_check in drivers  to reject
>> >> elf64 for instance ?
>> >>
>> >> Since elf is a "specific format" and that rproc can support other formats,
>> >> I did not want to add a specific elf_sanity_check field to rproc ops.
>> >>
>> >> Regards,
>> >>
>> >> Clément
>> >>
>> >> >
>> >> > Regards
>> >> > Arnaud
>> >> >
>> >> >>  {
>> >> >>   struct rproc_mem_entry *carveout;
>> >> >>   void *ptr = 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 = rproc->priv;
>> >> >>   void *va = NULL;
>> >> >> @@ -191,7 +191,7 @@ static void *slim_rproc_da_to_va(struct rproc *rproc, u64
>> >> >> da, int len)
>> >> >>           }
>> >> >>   }
>> >> >>
>> >> >> - dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%x va = 0x%pK\n",
>> >> >> + dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%llx va = 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 *rproc)
>> >> >>   return 0;
>> >> >>  }
>> >> >>
>> >> >> -static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
>> >> >> +static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, u64 len)
>> >> >>  {
>> >> >>   struct wkup_m3_rproc *wkupm3 = rproc->priv;
>> >> >>   void *va = NULL;
>> >> >>   int i;
>> >> >>   u32 offset;
>> >> >>
>> >> >> - if (len <= 0)
>> >> >> + if (len == 0)
>> >> >>           return NULL;
>> >> >>
>> >> >>   for (i = 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);

Mathieu Poirier Feb. 18, 2020, 5:01 p.m. UTC | #8

On Tue, 18 Feb 2020 at 03:10, Clément Leger <cleger@kalrayinc.com> wrote:
>
> Hi Mathieu,
>
> ----- On 12 Feb, 2020, at 22:59, Mathieu Poirier mathieu.poirier@linaro.org wrote:
>
> > On Wed, 12 Feb 2020 at 03:37, Clément Leger <cleger@kalray.eu> wrote:
> >>
> >> Hi Mathieu,
> >>
> >> ----- On 11 Feb, 2020, at 23:37, Mathieu Poirier mathieu.poirier@linaro.org
> >> wrote:
> >>
> >> > On Tue, Feb 11, 2020 at 05:39:21PM +0100, Clément 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 <cleger@kalray.eu>
> >> >> >> ---
> >> >> >>  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/imx_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 = priv->dcfg;
> >> >> >>   int i;
> >> >> >> @@ -203,19 +203,19 @@ static int imx_rproc_da_to_sys(struct imx_rproc *priv, u64
> >> >> >> da,
> >> >> >>           }
> >> >> >>   }
> >> >> >>
> >> >> >> - dev_warn(priv->dev, "Translation failed: da = 0x%llx len = 0x%x\n",
> >> >> >> + dev_warn(priv->dev, "Translation failed: da = 0x%llx len = 0x%llx\n",
> >> >> >>            da, len);
> >> >> >>   return -ENOENT;
> >> >> >>  }
> >> >> >>
> >> >> >> -static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
> >> >> >> +static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, u64 len)
> >> >> >>  {
> >> >> >>   struct imx_rproc *priv = rproc->priv;
> >> >> >>   void *va = NULL;
> >> >> >>   u64 sys;
> >> >> >>   int i;
> >> >> >>
> >> >> >> - if (len <= 0)
> >> >> >> + if (len == 0)
> >> >> >>           return NULL;
> >> >> >>
> >> >> >>   /*
> >> >> >> @@ -235,7 +235,8 @@ static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da,
> >> >> >> int len)
> >> >> >>           }
> >> >> >>   }
> >> >> >>
> >> >> >> - dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%x va = 0x%p\n", da, len, va);
> >> >> >> + dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%llx va = 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 *rproc, int
> >> >> >> vqid)
> >> >> >>   * can be used either by the remoteproc core for loading (when using 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 = rproc->priv;
> >> >> >>   void __iomem *va = NULL;
> >> >> >> @@ -255,7 +255,7 @@ static void *keystone_rproc_da_to_va(struct rproc *rproc,
> >> >> >> u64 da, int len)
> >> >> >>   size_t size;
> >> >> >>   int i;
> >> >> >>
> >> >> >> - if (len <= 0)
> >> >> >> + if (len == 0)
> >> >> >>           return NULL;
> >> >> >>
> >> >> >>   for (i = 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 = (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 = 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 = (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 len)
> >> >> >> +static void *q6v5_wcss_da_to_va(struct rproc *rproc, u64 da, u64 len)
> >> >> >>  {
> >> >> >>   struct q6v5_wcss *wcss = rproc->priv;
> >> >> >>   int offset;
> >> >> >> diff --git a/drivers/remoteproc/qcom_wcnss.c b/drivers/remoteproc/qcom_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 = (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 struct 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 not found
> >> >> them. Anyway, the argument was coming from Tomas or someone else, (I can't
> >> >> remember) talking about a 32 bits CPU executing code on a 64 bits accelerator.
> >> >> In that case, the size_t type could fail due to being only 32bits on the 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 patchset
> >> > is that supporting elf64 does __not__ mean we support 64bit MCU.  As long as
> >> > the addresses conveyed by the elf64 image fit within 32 bits we are fine.
> >> > Supporting 64bit MCUs is a completely different topic, one that will demand
> >> > serious refactoring.
> >>
> >> Exactly, an elf64 can potentially contain an executable fitting in 32 bits.
> >>
> >> >
> >> > 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 problems 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.
>
> I did the modification using u64 and tried to follow various code path.
> Some end up in dma_alloc_coherent which uses a size_t member. Since
> these might be called by rproc with a u64 len, I would be more
> inclined to use a size_t. I can probably also add a check in elf loader
> which verifies that if sizeof(size_t) < sizeof(u64), then the len must
> fit in 32bits. This seems more clean IMHO.
>

I'm all good with that.

> Clément.
>
> >
> > 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,
> >>
> >> Clément
> >>
> >> >
> >> >>
> >> >> > 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 thing).
> >> >> Or should it be supported by overriding .sanity_check in drivers  to reject
> >> >> elf64 for instance ?
> >> >>
> >> >> Since elf is a "specific format" and that rproc can support other formats,
> >> >> I did not want to add a specific elf_sanity_check field to rproc ops.
> >> >>
> >> >> Regards,
> >> >>
> >> >> Clément
> >> >>
> >> >> >
> >> >> > Regards
> >> >> > Arnaud
> >> >> >
> >> >> >>  {
> >> >> >>   struct rproc_mem_entry *carveout;
> >> >> >>   void *ptr = 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 = rproc->priv;
> >> >> >>   void *va = NULL;
> >> >> >> @@ -191,7 +191,7 @@ static void *slim_rproc_da_to_va(struct rproc *rproc, u64
> >> >> >> da, int len)
> >> >> >>           }
> >> >> >>   }
> >> >> >>
> >> >> >> - dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%x va = 0x%pK\n",
> >> >> >> + dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%llx va = 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 *rproc)
> >> >> >>   return 0;
> >> >> >>  }
> >> >> >>
> >> >> >> -static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
> >> >> >> +static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, u64 len)
> >> >> >>  {
> >> >> >>   struct wkup_m3_rproc *wkupm3 = rproc->priv;
> >> >> >>   void *va = NULL;
> >> >> >>   int i;
> >> >> >>   u32 offset;
> >> >> >>
> >> >> >> - if (len <= 0)
> >> >> >> + if (len == 0)
> >> >> >>           return NULL;
> >> >> >>
> >> >> >>   for (i = 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);

[v4,1/5] remoteproc: Use u64 len for da_to_va

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