Date:   Thu, 30 Jan 2020 13:27:09 +0000
From:   Horia Geanta <horia.geanta@....com>
To:     Laurentiu Tudor <laurentiu.tudor@....com>,
        Andrei Botila <andrei.botila@....com>,
        Stuart Yoder <stuyoder@...il.com>, Leo Li <leoyang.li@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        Andrey Smirnov <andrew.smirnov@...il.com>
Subject: Re: [PATCH] bus: fsl-mc: add api to retrieve mc version

On 1/27/2020 1:49 PM, Laurentiu Tudor wrote:
> 
>> -----Original Message-----
>> From: Andrei Botila <andrei.botila@....com>
>> Sent: Monday, January 27, 2020 1:16 PM
>>
>> Add a new api that returns Management Complex firmware version
>> and make the required structure public. The api's first user will be
>> the caam driver for setting prediction resistance bits.
>>
>> Signed-off-by: Andrei Botila <andrei.botila@....com>
> 
> Acked-by: Laurentiu Tudor <laurentiu.tudor@....com>
Reviewed-by: Horia Geantă <horia.geanta@....com>

We'll need this patch in the crypto subsystem,
such that the CAAM HWRNG patch series (currently v7)
https://patchwork.kernel.org/project/linux-crypto/list/?series=233763&archive=both&state=*
is updated to work with existing (and future) FSL MC f/w versions.

CAAM HWRNG series has been in review for quite some time
and AFAICT is in pretty good shape.
Unfortunately it missed v5.6 merge window. I would like it to go
in v5.7, but for this we'll need current patch (a dependency)
to go through (or be cherry-picked into) the crypto tree.

>> ---
>>  drivers/bus/fsl-mc/fsl-mc-bus.c | 33 +++++++++++++++++----------------
>>  include/linux/fsl/mc.h          | 16 ++++++++++++++++
>>  2 files changed, 33 insertions(+), 16 deletions(-)
>>
>> diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-
>> bus.c
>> index a07cc19becdb..330c76181604 100644
>> --- a/drivers/bus/fsl-mc/fsl-mc-bus.c
>> +++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
>> @@ -26,6 +26,8 @@
>>   */
>>  #define FSL_MC_DEFAULT_DMA_MASK	(~0ULL)
>>
>> +static struct fsl_mc_version mc_version;
>> +
>>  /**
>>   * struct fsl_mc - Private data of a "fsl,qoriq-mc" platform device
>>   * @root_mc_bus_dev: fsl-mc device representing the root DPRC
>> @@ -54,20 +56,6 @@ struct fsl_mc_addr_translation_range {
>>  	phys_addr_t start_phys_addr;
>>  };
>>
>> -/**
>> - * struct mc_version
>> - * @major: Major version number: incremented on API compatibility changes
>> - * @minor: Minor version number: incremented on API additions (that are
>> - *		backward compatible); reset when major version is incremented
>> - * @revision: Internal revision number: incremented on implementation
>> changes
>> - *		and/or bug fixes that have no impact on API
>> - */
>> -struct mc_version {
>> -	u32 major;
>> -	u32 minor;
>> -	u32 revision;
>> -};
>> -
>>  /**
>>   * fsl_mc_bus_match - device to driver matching callback
>>   * @dev: the fsl-mc device to match against
>> @@ -338,7 +326,7 @@ EXPORT_SYMBOL_GPL(fsl_mc_driver_unregister);
>>   */
>>  static int mc_get_version(struct fsl_mc_io *mc_io,
>>  			  u32 cmd_flags,
>> -			  struct mc_version *mc_ver_info)
>> +			  struct fsl_mc_version *mc_ver_info)
>>  {
>>  	struct fsl_mc_command cmd = { 0 };
>>  	struct dpmng_rsp_get_version *rsp_params;
>> @@ -363,6 +351,20 @@ static int mc_get_version(struct fsl_mc_io *mc_io,
>>  	return 0;
>>  }
>>
>> +/**
>> + * fsl_mc_get_version - function to retrieve the MC f/w version
>> information
>> + *
>> + * Return:	mc version when called after fsl-mc-bus probe; NULL otherwise.
>> + */
>> +struct fsl_mc_version *fsl_mc_get_version(void)
>> +{
>> +	if (mc_version.major)
>> +		return &mc_version;
>> +
>> +	return NULL;
>> +}
>> +EXPORT_SYMBOL_GPL(fsl_mc_get_version);
>> +
>>  /**
>>   * fsl_mc_get_root_dprc - function to traverse to the root dprc
>>   */
>> @@ -862,7 +864,6 @@ static int fsl_mc_bus_probe(struct platform_device
>> *pdev)
>>  	int container_id;
>>  	phys_addr_t mc_portal_phys_addr;
>>  	u32 mc_portal_size;
>> -	struct mc_version mc_version;
>>  	struct resource res;
>>
>>  	mc = devm_kzalloc(&pdev->dev, sizeof(*mc), GFP_KERNEL);
>> diff --git a/include/linux/fsl/mc.h b/include/linux/fsl/mc.h
>> index 54d9436600c7..2b5f8366dbe1 100644
>> --- a/include/linux/fsl/mc.h
>> +++ b/include/linux/fsl/mc.h
>> @@ -381,6 +381,22 @@ int __must_check __fsl_mc_driver_register(struct
>> fsl_mc_driver *fsl_mc_driver,
>>
>>  void fsl_mc_driver_unregister(struct fsl_mc_driver *driver);
>>
>> +/**
>> + * struct fsl_mc_version
>> + * @major: Major version number: incremented on API compatibility changes
>> + * @minor: Minor version number: incremented on API additions (that are
>> + *		backward compatible); reset when major version is incremented
>> + * @revision: Internal revision number: incremented on implementation
>> changes
>> + *		and/or bug fixes that have no impact on API
>> + */
>> +struct fsl_mc_version {
>> +	u32 major;
>> +	u32 minor;
>> +	u32 revision;
>> +};
>> +
>> +struct fsl_mc_version *fsl_mc_get_version(void);
>> +
>>  int __must_check fsl_mc_portal_allocate(struct fsl_mc_device *mc_dev,
>>  					u16 mc_io_flags,
>>  					struct fsl_mc_io **new_mc_io);
>> --
>> 2.17.1
> 
> 
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