linux-kernel - Re: [PATCH] mfd: intel-m10-bmc: Change staging size to a variable

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Message-ID: <ZgqCdfCSatazEkIj@yilunxu-OptiPlex-7050>
Date: Mon, 1 Apr 2024 17:46:29 +0800
From: Xu Yilun <yilun.xu@...ux.intel.com>
To: Peter Colberg <peter.colberg@...el.com>
Cc: Moritz Fischer <mdf@...nel.org>, Wu Hao <hao.wu@...el.com>,
	Xu Yilun <yilun.xu@...el.com>, Tom Rix <trix@...hat.com>,
	Lee Jones <lee@...nel.org>, linux-fpga@...r.kernel.org,
	linux-kernel@...r.kernel.org, Russ Weight <russ.weight@...ux.dev>,
	Marco Pagani <marpagan@...hat.com>,
	Matthew Gerlach <matthew.gerlach@...ux.intel.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Russ Weight <russell.h.weight@...el.com>
Subject: Re: [PATCH] mfd: intel-m10-bmc: Change staging size to a variable

On Thu, Mar 28, 2024 at 07:35:59PM -0400, Peter Colberg wrote:
> From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> 
> The size of the staging area in FLASH for FPGA updates is dependent on the
> size of the FPGA. Currently, the staging size is defined as a constant.
> Larger FPGAs are coming soon and it will soon be necessary to support

Soon? When? You cannot add some feature without a user case. If you do
have a use case, put the patch in the same patchset.

Thanks,
Yilun

> different sizes for the staging area. Add a new staging_size member to the
> csr_map structure to support a variable staging size.
> 
> The secure update driver does a sanity-check of the image size in
> comparison to the size of the staging area in FLASH. Change the
> staging size reference to a variable instead of a constant in order
> to more readily support future, larger FPGAs.
> 
> Co-developed-by: Russ Weight <russell.h.weight@...el.com>
> Signed-off-by: Russ Weight <russell.h.weight@...el.com>
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> Signed-off-by: Peter Colberg <peter.colberg@...el.com>
> ---
>  drivers/fpga/intel-m10-bmc-sec-update.c | 3 ++-
>  drivers/mfd/intel-m10-bmc-pmci.c        | 1 +
>  drivers/mfd/intel-m10-bmc-spi.c         | 1 +
>  include/linux/mfd/intel-m10-bmc.h       | 1 +
>  4 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/fpga/intel-m10-bmc-sec-update.c b/drivers/fpga/intel-m10-bmc-sec-update.c
> index 89851b133709..7ac9f9f5af12 100644
> --- a/drivers/fpga/intel-m10-bmc-sec-update.c
> +++ b/drivers/fpga/intel-m10-bmc-sec-update.c
> @@ -529,11 +529,12 @@ static enum fw_upload_err m10bmc_sec_prepare(struct fw_upload *fwl,
>  					     const u8 *data, u32 size)
>  {
>  	struct m10bmc_sec *sec = fwl->dd_handle;
> +	const struct m10bmc_csr_map *csr_map = sec->m10bmc->info->csr_map;
>  	u32 ret;
>  
>  	sec->cancel_request = false;
>  
> -	if (!size || size > M10BMC_STAGING_SIZE)
> +	if (!size || size > csr_map->staging_size)
>  		return FW_UPLOAD_ERR_INVALID_SIZE;
>  
>  	if (sec->m10bmc->flash_bulk_ops)
> diff --git a/drivers/mfd/intel-m10-bmc-pmci.c b/drivers/mfd/intel-m10-bmc-pmci.c
> index 0392ef8b57d8..698c5933938b 100644
> --- a/drivers/mfd/intel-m10-bmc-pmci.c
> +++ b/drivers/mfd/intel-m10-bmc-pmci.c
> @@ -370,6 +370,7 @@ static const struct m10bmc_csr_map m10bmc_n6000_csr_map = {
>  	.pr_reh_addr = M10BMC_N6000_PR_REH_ADDR,
>  	.pr_magic = M10BMC_N6000_PR_PROG_MAGIC,
>  	.rsu_update_counter = M10BMC_N6000_STAGING_FLASH_COUNT,
> +	.staging_size = M10BMC_STAGING_SIZE,
>  };
>  
>  static const struct intel_m10bmc_platform_info m10bmc_pmci_n6000 = {
> diff --git a/drivers/mfd/intel-m10-bmc-spi.c b/drivers/mfd/intel-m10-bmc-spi.c
> index cbeb7de9e041..d64d28199df6 100644
> --- a/drivers/mfd/intel-m10-bmc-spi.c
> +++ b/drivers/mfd/intel-m10-bmc-spi.c
> @@ -109,6 +109,7 @@ static const struct m10bmc_csr_map m10bmc_n3000_csr_map = {
>  	.pr_reh_addr = M10BMC_N3000_PR_REH_ADDR,
>  	.pr_magic = M10BMC_N3000_PR_PROG_MAGIC,
>  	.rsu_update_counter = M10BMC_N3000_STAGING_FLASH_COUNT,
> +	.staging_size = M10BMC_STAGING_SIZE,
>  };
>  
>  static struct mfd_cell m10bmc_d5005_subdevs[] = {
> diff --git a/include/linux/mfd/intel-m10-bmc.h b/include/linux/mfd/intel-m10-bmc.h
> index ee66c9751003..988f1cd90032 100644
> --- a/include/linux/mfd/intel-m10-bmc.h
> +++ b/include/linux/mfd/intel-m10-bmc.h
> @@ -205,6 +205,7 @@ struct m10bmc_csr_map {
>  	unsigned int pr_reh_addr;
>  	unsigned int pr_magic;
>  	unsigned int rsu_update_counter;
> +	unsigned int staging_size;
>  };
>  
>  /**
> -- 
> 2.44.0
> 
>