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SubjectRe: [PATCH v2 3/4] mfd: intel-m10-bmc: Add access table configuration to the regmap
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On 1/25/21 10:50 PM, Xu Yilun wrote:
> From: Matthew Gerlach <matthew.gerlach@linux.intel.com>
>
> This patch adds access tables to the MAX 10 BMC regmap. This prevents
> the host from accessing the unwanted I/O space. It also filters out the
> invalid outputs when reading the regmap debugfs interface.
>
> Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
> Signed-off-by: Xu Yilun <yilun.xu@intel.com>
> ---
> v2: no change.

v2: Use M10BMC_LEGACY_BUILD_VER

Looks good.

Reviewed-by: Tom Rix <trix@redhat.com>


> ---
> drivers/mfd/intel-m10-bmc.c | 13 +++++++++++++
> include/linux/mfd/intel-m10-bmc.h | 5 ++++-
> 2 files changed, 17 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mfd/intel-m10-bmc.c b/drivers/mfd/intel-m10-bmc.c
> index aad86f0..4240e99 100644
> --- a/drivers/mfd/intel-m10-bmc.c
> +++ b/drivers/mfd/intel-m10-bmc.c
> @@ -23,10 +23,23 @@ static struct mfd_cell m10bmc_pacn3000_subdevs[] = {
> { .name = "n3000bmc-secure" },
> };
>
> +static const struct regmap_range m10bmc_regmap_range[] = {
> + regmap_reg_range(M10BMC_LEGACY_BUILD_VER, M10BMC_LEGACY_BUILD_VER),
> + regmap_reg_range(M10BMC_SYS_BASE, M10BMC_SYS_END),
> + regmap_reg_range(M10BMC_FLASH_BASE, M10BMC_FLASH_END),
> +};
> +
> +static const struct regmap_access_table m10bmc_access_table = {
> + .yes_ranges = m10bmc_regmap_range,
> + .n_yes_ranges = ARRAY_SIZE(m10bmc_regmap_range),
> +};
> +
> static struct regmap_config intel_m10bmc_regmap_config = {
> .reg_bits = 32,
> .val_bits = 32,
> .reg_stride = 4,
> + .wr_table = &m10bmc_access_table,
> + .rd_table = &m10bmc_access_table,
> .max_register = M10BMC_MEM_END,
> };
>
> diff --git a/include/linux/mfd/intel-m10-bmc.h b/include/linux/mfd/intel-m10-bmc.h
> index 99f44b1..dc2e858 100644
> --- a/include/linux/mfd/intel-m10-bmc.h
> +++ b/include/linux/mfd/intel-m10-bmc.h
> @@ -11,7 +11,10 @@
>
> #define M10BMC_LEGACY_BUILD_VER 0x300468
> #define M10BMC_SYS_BASE 0x300800
> -#define M10BMC_MEM_END 0x1fffffff
> +#define M10BMC_SYS_END 0x300fff
> +#define M10BMC_FLASH_BASE 0x10000000
> +#define M10BMC_FLASH_END 0x1fffffff
> +#define M10BMC_MEM_END M10BMC_FLASH_END
>
> /* Register offset of system registers */
> #define NIOS2_FW_VERSION 0x0

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