Re: [PATCH] drivers: crypto: caam: jr: Allow quiesce when quiesced

[Vijay Balakrishna <vijayb@linux.microsoft.com>]

On 2/20/2023 9:42 PM, meenakshi.aggarwal@nxp.com wrote:
> From: Horia Geanta <horia.geanta@nxp.com>
> 
> Issues:
> - Job ring device is busy when do kexec reboot
> - Failed to flush job ring when do system suspend-resume
> 
> Fix:
> Flush the job ring to stop the running jobs.
> 
> Signed-off-by: Horia Geanta <horia.geanta@nxp.com>
> Signed-off-by: Franck LENORMAND <franck.lenormand@nxp.com>

Tested-by: Vijay Balakrishna <vijayb@linux.microsoft.com>

Thanks,
Vijay


> ---
>   drivers/crypto/caam/jr.c | 53 +++++++++++++++++++++++++++++++++-------
>   1 file changed, 44 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c
> index 724fdec18bf9..8745fe3cb575 100644
> --- a/drivers/crypto/caam/jr.c
> +++ b/drivers/crypto/caam/jr.c
> @@ -72,19 +72,27 @@ static void caam_jr_crypto_engine_exit(void *data)
>   	crypto_engine_exit(jrpriv->engine);
>   }
>   
> -static int caam_reset_hw_jr(struct device *dev)
> +/*
> + * Put the CAAM in quiesce, ie stop
> + *
> + * Must be called with itr disabled
> + */
> +static int caam_jr_stop_processing(struct device *dev, u32 jrcr_bits)
>   {
>   	struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
>   	unsigned int timeout = 100000;
>   
> -	/*
> -	 * mask interrupts since we are going to poll
> -	 * for reset completion status
> -	 */
> -	clrsetbits_32(&jrp->rregs->rconfig_lo, 0, JRCFG_IMSK);
> +	/* Check the current status */
> +	if (rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_INPROGRESS)
> +		goto wait_quiesce_completion;
>   
> -	/* initiate flush (required prior to reset) */
> -	wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET);
> +	/* Reset the field */
> +	clrsetbits_32(&jrp->rregs->jrintstatus, JRINT_ERR_HALT_MASK, 0);
> +
> +	/* initiate flush / park (required prior to reset) */
> +	wr_reg32(&jrp->rregs->jrcommand, jrcr_bits);
> +
> +wait_quiesce_completion:
>   	while (((rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_MASK) ==
>   		JRINT_ERR_HALT_INPROGRESS) && --timeout)
>   		cpu_relax();
> @@ -95,8 +103,35 @@ static int caam_reset_hw_jr(struct device *dev)
>   		return -EIO;
>   	}
>   
> +	return 0;
> +}
> +
> +/*
> + * Flush the job ring, so the jobs running will be stopped, jobs queued will be
> + * invalidated and the CAAM will no longer fetch fron input ring.
> + *
> + * Must be called with itr disabled
> + */
> +static int caam_jr_flush(struct device *dev)
> +{
> +	return caam_jr_stop_processing(dev, JRCR_RESET);
> +}
> +
> +static int caam_reset_hw_jr(struct device *dev)
> +{
> +	struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
> +	unsigned int timeout = 100000;
> +	int err;
> +	/*
> +	 * mask interrupts since we are going to poll
> +	 * for reset completion status
> +	 */
> +	clrsetbits_32(&jrp->rregs->rconfig_lo, 0, JRCFG_IMSK);
> +	err = caam_jr_flush(dev);
> +	if (err)
> +		return err;
> +
>   	/* initiate reset */
> -	timeout = 100000;
>   	wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET);
>   	while ((rd_reg32(&jrp->rregs->jrcommand) & JRCR_RESET) && --timeout)
>   		cpu_relax();