linux-kernel - Re: [RFC 06/19] s390/zcrypt: register matrix device with VFIO mediated device framework

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Date:   Mon, 16 Oct 2017 11:03:29 +0200
From:   Martin Schwidefsky <schwidefsky@...ibm.com>
To:     Tony Krowiak <akrowiak@...ux.vnet.ibm.com>
Cc:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, freude@...ibm.com, heiko.carstens@...ibm.com,
        borntraeger@...ibm.com, cohuck@...hat.com, kwankhede@...dia.com,
        bjsdjshi@...ux.vnet.ibm.com, pbonzini@...hat.com,
        alex.williamson@...hat.com, pmorel@...ux.vnet.ibm.com,
        alifm@...ux.vnet.ibm.com, mjrosato@...ux.vnet.ibm.com,
        qemu-s390x@...gnu.org, jjherne@...ux.vnet.ibm.com,
        thuth@...hat.com, pasic@...ux.vnet.ibm.com
Subject: Re: [RFC 06/19] s390/zcrypt: register matrix device with VFIO
 mediated device framework

On Fri, 13 Oct 2017 13:38:51 -0400
Tony Krowiak <akrowiak@...ux.vnet.ibm.com> wrote:

> diff --git a/drivers/s390/crypto/ap_matrix_bus.c b/drivers/s390/crypto/ap_matrix_bus.c
> index 66bfa54..418c23b 100644
> --- a/drivers/s390/crypto/ap_matrix_bus.c
> +++ b/drivers/s390/crypto/ap_matrix_bus.c
> @@ -61,6 +61,7 @@ static int ap_matrix_dev_create(void)
>  	matrix->device.bus = &ap_matrix_bus_type;
>  	matrix->device.parent = ap_matrix_root_device;
>  	matrix->device.release = ap_matrix_dev_release;
> +	INIT_LIST_HEAD(&matrix->queues);
> 
>  	ret = device_register(&matrix->device);
>  	if (ret) {
> diff --git a/drivers/s390/crypto/ap_matrix_bus.h b/drivers/s390/crypto/ap_matrix_bus.h
> index c2aff23..3eccc36 100644
> --- a/drivers/s390/crypto/ap_matrix_bus.h
> +++ b/drivers/s390/crypto/ap_matrix_bus.h
> @@ -12,8 +12,12 @@
> 
>  #include <linux/device.h>
> 
> +#include "ap_bus.h"
> +
>  struct ap_matrix {
>  	struct device device;
> +	spinlock_t qlock;
> +	struct list_head queues;
>  };
> 
>  struct ap_matrix *ap_matrix_get_device(void);

Move these two hunks into patch #5 please. Yes, strictly speaking the two elements
in the struct ap_matrix are needed only with patch #6, but it is fine to introduce
an element with a new driver that is only exploited with a later patch.

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.