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

[Meenakshi Aggarwal]

Hi Herbert,

Please apply the patch if you have no comments.

Thanks,
Meenakshi

> -----Original Message-----
> From: meenakshi.aggarwal@xxxxxxx <meenakshi.aggarwal@xxxxxxx>
> Sent: Wednesday, March 1, 2023 12:08 AM
> To: Horia Geanta <horia.geanta@xxxxxxx>; Varun Sethi <V.Sethi@xxxxxxx>;
> Pankaj Gupta <pankaj.gupta@xxxxxxx>; Gaurav Jain <gaurav.jain@xxxxxxx>;
> herbert@xxxxxxxxxxxxxxxxxxx; davem@xxxxxxxxxxxxx; linux-
> crypto@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Franck Lenormand
> <franck.lenormand@xxxxxxx>
> Cc: vijayb@xxxxxxxxxxxxxxxxxxx; code@xxxxxxxxxxx
> Subject: [PATCH] drivers: crypto: caam: jr: Allow quiesce when quiesced
> 
> From: Horia Geanta <horia.geanta@xxxxxxx>
> 
> 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@xxxxxxx>
> Signed-off-by: Franck LENORMAND <franck.lenormand@xxxxxxx>
> Reviewed-by: Pankaj Gupta <pankaj.gupta@xxxxxxx>
> ---
>  drivers/crypto/caam/jr.c | 55 ++++++++++++++++++++++++++++++++--------
>  1 file changed, 45 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c index
> 724fdec18bf9..eb3b9a7e9a35 100644
> --- a/drivers/crypto/caam/jr.c
> +++ b/drivers/crypto/caam/jr.c
> @@ -4,7 +4,7 @@
>   * JobR backend functionality
>   *
>   * Copyright 2008-2012 Freescale Semiconductor, Inc.
> - * Copyright 2019 NXP
> + * Copyright 2019, 2023 NXP
>   */
> 
>  #include <linux/of_irq.h>
> @@ -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();
> --
> 2.25.1