Re: [PATCH v1 12/12] fpga: add max10 get_hw_errinfo callback func

Tom Rix
2020-09-06T17:14:27Z

On 9/4/20 4:53 PM, Russ Weight wrote:
> Extend the MAX10 BMC Security Engine driver to include
> a function that returns 64 bits of additional HW specific
> data for errors that require additional information.
> This callback function enables the hw_errinfo sysfs
> node in the Intel Security Manager class driver.
>
> Signed-off-by: Russ Weight <russell.h.weight@intel.com>
> Reviewed-by: Wu Hao <hao.wu@intel.com>
> ---
> drivers/fpga/intel-m10-bmc-secure.c | 27 ++++++++++++++++++++++++++-
> 1 file changed, 26 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/fpga/intel-m10-bmc-secure.c b/drivers/fpga/intel-m10-bmc-secure.c
> index 4a66c2d448eb..7fb1c805f654 100644
> --- a/drivers/fpga/intel-m10-bmc-secure.c
> +++ b/drivers/fpga/intel-m10-bmc-secure.c
> @@ -450,6 +450,30 @@ static enum ifpga_sec_err m10bmc_sec_cancel(struct ifpga_sec_mgr *imgr)
> return ret ? IFPGA_SEC_ERR_RW_ERROR : IFPGA_SEC_ERR_NONE;
> }
>
> +static u64 m10bmc_sec_hw_errinfo(struct ifpga_sec_mgr *imgr)
> +{
> + struct m10bmc_sec *sec = imgr->priv;
> + u32 doorbell = 0, auth_result = 0;
> + u64 hw_errinfo = 0;

hw_errinfo should be initialized to some poison value like -1

to cover the case if either of sys_read's fail.

Tom

> +
> + switch (imgr->err_code) {
> + case IFPGA_SEC_ERR_HW_ERROR:
> + case IFPGA_SEC_ERR_TIMEOUT:
> + case IFPGA_SEC_ERR_BUSY:
> + case IFPGA_SEC_ERR_WEAROUT:
> + if (!m10bmc_sys_read(sec->m10bmc, M10BMC_DOORBELL, &doorbell))
> + hw_errinfo = (u64)doorbell << 32;
> +
> + if (!m10bmc_sys_read(sec->m10bmc, M10BMC_AUTH_RESULT,
> + &auth_result))
> + hw_errinfo |= (u64)auth_result;
> +
> + return hw_errinfo;
> + default:
> + return 0;
> + }
> +}
> +
> 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,
> @@ -467,7 +491,8 @@ static const struct ifpga_sec_mgr_ops m10bmc_iops = {
> .prepare = m10bmc_sec_prepare,
> .write_blk = m10bmc_sec_write_blk,
> .poll_complete = m10bmc_sec_poll_complete,
> - .cancel = m10bmc_sec_cancel
> + .cancel = m10bmc_sec_cancel,
> + .get_hw_errinfo = m10bmc_sec_hw_errinfo
> };
>
> static void ifpga_sec_mgr_uinit(struct m10bmc_sec *sec)