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Date:   Tue, 10 Mar 2020 08:59:11 +0100 (CET)
From:   =?utf-8?Q?Cl=C3=A9ment?= Leger <cleger@kalrayinc.com>
To:     Mathieu Poirier <mathieu.poirier@linaro.org>
Cc:     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 <linux-remoteproc@vger.kernel.org>,
        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 <linux-doc@vger.kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        linux-arm-msm <linux-arm-msm@vger.kernel.org>,
        Arnaud Pouliquen <arnaud.pouliquen@st.com>,
        Loic PALLARDY <loic.pallardy@st.com>, s-anna <s-anna@ti.com>
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Subject: Re: [PATCH v5 3/8] remoteproc: Use u64 type for boot_addr
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Thread-Topic: remoteproc: Use u64 type for boot_addr
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----- On 9 Mar, 2020, at 20:52, Mathieu Poirier mathieu.poirier@linaro.org wrote:

> On Mon, Mar 02, 2020 at 10:38:57AM +0100, Clement Leger wrote:
>> elf64 entry is defined as a u64. Since boot_addr is used to store the
>> elf entry point, change boot_addr type to u64 to support both elf32
>> and elf64. In the same time, fix users that were using this variable.
>> 
>> Signed-off-by: Clement Leger <cleger@kalray.eu>
>> ---
>>  drivers/remoteproc/remoteproc_elf_loader.c | 2 +-
>>  drivers/remoteproc/remoteproc_internal.h   | 2 +-
>>  drivers/remoteproc/st_remoteproc.c         | 2 +-
>>  include/linux/remoteproc.h                 | 4 ++--
>>  4 files changed, 5 insertions(+), 5 deletions(-)
>> 
>> diff --git a/drivers/remoteproc/remoteproc_elf_loader.c
>> b/drivers/remoteproc/remoteproc_elf_loader.c
>> index 606aae166eba..c2a9783cfb9a 100644
>> --- a/drivers/remoteproc/remoteproc_elf_loader.c
>> +++ b/drivers/remoteproc/remoteproc_elf_loader.c
>> @@ -102,7 +102,7 @@ EXPORT_SYMBOL(rproc_elf_sanity_check);
>>   * Note that the boot address is not a configurable property of all remote
>>   * processors. Some will always boot at a specific hard-coded address.
>>   */
>> -u32 rproc_elf_get_boot_addr(struct rproc *rproc, const struct firmware *fw)
>> +u64 rproc_elf_get_boot_addr(struct rproc *rproc, const struct firmware *fw)
>>  {
>>  	struct elf32_hdr *ehdr  = (struct elf32_hdr *)fw->data;
>>  
>> diff --git a/drivers/remoteproc/remoteproc_internal.h
>> b/drivers/remoteproc/remoteproc_internal.h
>> index 58580210575c..0deae5f237b8 100644
>> --- a/drivers/remoteproc/remoteproc_internal.h
>> +++ b/drivers/remoteproc/remoteproc_internal.h
>> @@ -55,7 +55,7 @@ phys_addr_t rproc_va_to_pa(void *cpu_addr);
>>  int rproc_trigger_recovery(struct rproc *rproc);
>>  
>>  int rproc_elf_sanity_check(struct rproc *rproc, const struct firmware *fw);
>> -u32 rproc_elf_get_boot_addr(struct rproc *rproc, const struct firmware *fw);
>> +u64 rproc_elf_get_boot_addr(struct rproc *rproc, const struct firmware *fw);
>>  int rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw);
>>  int rproc_elf_load_rsc_table(struct rproc *rproc, const struct firmware *fw);
>>  struct resource_table *rproc_elf_find_loaded_rsc_table(struct rproc *rproc,
> 
> The return type of function rproc_get_boot_addr() should also be changed from
> u32 to u64.  Or perhaps this is intentional to make sure rproc->bootaddr never
> occupies more than 32bit?

No, this is a mistake clearly. I haven't been able to test with a 64 bit
boot address since our remote processors always boot in the 32 bits
space. But since the elf64 boot address is on 64 bitsn this was a logical
modification. I will fix that.

> 
>> diff --git a/drivers/remoteproc/st_remoteproc.c
>> b/drivers/remoteproc/st_remoteproc.c
>> index ee13d23b43a9..a3268d95a50e 100644
>> --- a/drivers/remoteproc/st_remoteproc.c
>> +++ b/drivers/remoteproc/st_remoteproc.c
>> @@ -190,7 +190,7 @@ static int st_rproc_start(struct rproc *rproc)
>>  		}
>>  	}
>>  
>> -	dev_info(&rproc->dev, "Started from 0x%x\n", rproc->bootaddr);
>> +	dev_info(&rproc->dev, "Started from 0x%llx\n", rproc->bootaddr);
>>  
>>  	return 0;
>>  
>> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
>> index bee559330204..1683d6c386a6 100644
>> --- a/include/linux/remoteproc.h
>> +++ b/include/linux/remoteproc.h
>> @@ -382,7 +382,7 @@ struct rproc_ops {
>>  				struct rproc *rproc, const struct firmware *fw);
>>  	int (*load)(struct rproc *rproc, const struct firmware *fw);
>>  	int (*sanity_check)(struct rproc *rproc, const struct firmware *fw);
>> -	u32 (*get_boot_addr)(struct rproc *rproc, const struct firmware *fw);
>> +	u64 (*get_boot_addr)(struct rproc *rproc, const struct firmware *fw);
>>  };
>>  
>>  /**
>> @@ -498,7 +498,7 @@ struct rproc {
>>  	int num_traces;
>>  	struct list_head carveouts;
>>  	struct list_head mappings;
>> -	u32 bootaddr;
>> +	u64 bootaddr;
>>  	struct list_head rvdevs;
>>  	struct list_head subdevs;
>>  	struct idr notifyids;
>> --
>> 2.15.0.276.g89ea799