linux-kernel - Re: [PATCH v1 04/12] fpga: expose max10 canceled keys in sysfs

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Date:   Sat, 5 Sep 2020 13:52:18 -0700
From:   Tom Rix <trix@...hat.com>
To:     Russ Weight <russell.h.weight@...el.com>, mdf@...nel.org,
        lee.jones@...aro.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     lgoncalv@...hat.com, yilun.xu@...el.com, hao.wu@...el.com,
        matthew.gerlach@...el.com
Subject: Re: [PATCH v1 04/12] fpga: expose max10 canceled keys in sysfs


On 9/4/20 4:52 PM, Russ Weight wrote:
> Extend the MAX10 BMC Security Engine driver to provide a
> handler to expose the canceled code signing key (CSK) bit
> vectors. These use the standard bitmap list format
> (e.g. 1,2-6,9).
>
> Signed-off-by: Russ Weight <russell.h.weight@...el.com>
> Reviewed-by: Wu Hao <hao.wu@...el.com>
> ---
>  drivers/fpga/intel-m10-bmc-secure.c | 60 +++++++++++++++++++++++++++++
>  1 file changed, 60 insertions(+)
>
> diff --git a/drivers/fpga/intel-m10-bmc-secure.c b/drivers/fpga/intel-m10-bmc-secure.c
> index b824790e43aa..46cd49a08be0 100644
> --- a/drivers/fpga/intel-m10-bmc-secure.c
> +++ b/drivers/fpga/intel-m10-bmc-secure.c
> @@ -130,14 +130,74 @@ static int get_qspi_flash_count(struct ifpga_sec_mgr *imgr)
>  	return ret ? : cnt;
>  }
>  
> +#define CSK_BIT_LEN			128U
> +#define CSK_32ARRAY_SIZE(_nbits)	DIV_ROUND_UP(_nbits, 32)
> +
> +#define SYSFS_GET_CSK_CANCEL_NBITS(_name) \
> +static int get_##_name##_csk_cancel_nbits(struct ifpga_sec_mgr *imgr) \
> +{ \
> +	return (int)CSK_BIT_LEN; \
> +}
> +
> +SYSFS_GET_CSK_CANCEL_NBITS(bmc)
> +SYSFS_GET_CSK_CANCEL_NBITS(sr)
> +SYSFS_GET_CSK_CANCEL_NBITS(pr)

> +
> +static int get_csk_vector(struct ifpga_sec_mgr *imgr, u32 addr,
> +			  unsigned long *csk_map, unsigned int nbits)
> +{
> +	unsigned int i, arr_size = CSK_32ARRAY_SIZE(nbits);

> +	struct m10bmc_sec *sec = imgr->priv;
> +	u32 *csk32;
> +	int ret;
> +
> +	csk32 = vmalloc(arr_size);
> +	if (!csk32)
> +		return -ENOMEM;
> +
> +	ret = m10bmc_raw_bulk_read(sec->m10bmc, addr, csk32, arr_size);

Is this correct ? other similar bulk read used the

regmap stride.

> +	if (ret) {
> +		dev_err(sec->dev, "%s failed to read %d\n", __func__, ret);
> +		goto vfree_exit;
> +	}
> +
> +	for (i = 0; i < arr_size; i++)
> +		csk32[i] = le32_to_cpu(csk32[i]);
> +
> +	bitmap_from_arr32(csk_map, csk32, nbits);
> +	bitmap_complement(csk_map, csk_map, nbits);
> +
> +vfree_exit:
> +	vfree(csk32);
> +	return ret;
> +}
> +
> +#define SYSFS_GET_CSK_VEC(_name, _addr) \
> +static int get_##_name##_canceled_csks(struct ifpga_sec_mgr *imgr, \
> +				       unsigned long *csk_map, \
> +				       unsigned int nbits) \
> +{ return get_csk_vector(imgr, _addr, csk_map, nbits); }
> +
> +#define CSK_VEC_OFFSET 0x34
> +
> +SYSFS_GET_CSK_VEC(bmc, BMC_PROG_ADDR + CSK_VEC_OFFSET)
> +SYSFS_GET_CSK_VEC(sr, SR_PROG_ADDR + CSK_VEC_OFFSET)
> +SYSFS_GET_CSK_VEC(pr, PR_PROG_ADDR + CSK_VEC_OFFSET)
Issues similar with earlier patches.
> +
>  static const struct ifpga_sec_mgr_ops m10bmc_iops = {
>  	.user_flash_count = get_qspi_flash_count,
>  	.bmc_root_entry_hash = get_bmc_root_entry_hash,
>  	.sr_root_entry_hash = get_sr_root_entry_hash,
>  	.pr_root_entry_hash = get_pr_root_entry_hash,
> +	.bmc_canceled_csks = get_bmc_canceled_csks,
> +	.sr_canceled_csks = get_sr_canceled_csks,
> +	.pr_canceled_csks = get_pr_canceled_csks,
>  	.bmc_reh_size = get_bmc_reh_size,
>  	.sr_reh_size = get_sr_reh_size,
>  	.pr_reh_size = get_pr_reh_size,
> +	.bmc_canceled_csk_nbits = get_bmc_csk_cancel_nbits,
> +	.sr_canceled_csk_nbits = get_sr_csk_cancel_nbits,
> +	.pr_canceled_csk_nbits = get_pr_csk_cancel_nbits

These are copies the same function, replace with a

common function.

Tom

>  };
>  
>  static void ifpga_sec_mgr_uinit(struct m10bmc_sec *sec)