Date:   Wed, 8 Dec 2021 14:14:11 +0100
From:   Claudio Imbrenda <imbrenda@linux.ibm.com>
To:     Matthew Rosato <mjrosato@linux.ibm.com>
Cc:     linux-s390@vger.kernel.org, alex.williamson@redhat.com,
        cohuck@redhat.com, schnelle@linux.ibm.com, farman@linux.ibm.com,
        pmorel@linux.ibm.com, borntraeger@linux.ibm.com, hca@linux.ibm.com,
        gor@linux.ibm.com, gerald.schaefer@linux.ibm.com,
        agordeev@linux.ibm.com, frankja@linux.ibm.com, david@redhat.com,
        vneethv@linux.ibm.com, oberpar@linux.ibm.com, freude@linux.ibm.com,
        thuth@redhat.com, pasic@linux.ibm.com, kvm@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 05/32] s390/airq: pass more TPI info to airq handlers
Message-ID: <20211208141411.37fa6453@p-imbrenda>
In-Reply-To: <20211207205743.150299-6-mjrosato@linux.ibm.com>
References: <20211207205743.150299-1-mjrosato@linux.ibm.com>
        <20211207205743.150299-6-mjrosato@linux.ibm.com>
Organization: IBM
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Precedence: bulk

On Tue,  7 Dec 2021 15:57:16 -0500
Matthew Rosato <mjrosato@linux.ibm.com> wrote:

> A subsequent patch will introduce an airq handler that requires additional
> TPI information beyond directed vs floating, so pass the entire tpi_info
> structure via the handler.  Only pci actually uses this information today,
> for the other airq handlers this is effectively a no-op.
> 
> Reviewed-by: Eric Farman <farman@linux.ibm.com>

Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>

> Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
> ---
>  arch/s390/include/asm/airq.h     | 3 ++-
>  arch/s390/kvm/interrupt.c        | 4 +++-
>  arch/s390/pci/pci_irq.c          | 9 +++++++--
>  drivers/s390/cio/airq.c          | 2 +-
>  drivers/s390/cio/qdio_thinint.c  | 6 ++++--
>  drivers/s390/crypto/ap_bus.c     | 9 ++++++---
>  drivers/s390/virtio/virtio_ccw.c | 4 +++-
>  7 files changed, 26 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/s390/include/asm/airq.h b/arch/s390/include/asm/airq.h
> index 01936fdfaddb..7918a7d09028 100644
> --- a/arch/s390/include/asm/airq.h
> +++ b/arch/s390/include/asm/airq.h
> @@ -12,10 +12,11 @@
>  
>  #include <linux/bit_spinlock.h>
>  #include <linux/dma-mapping.h>
> +#include <asm/tpi.h>
>  
>  struct airq_struct {
>  	struct hlist_node list;		/* Handler queueing. */
> -	void (*handler)(struct airq_struct *airq, bool floating);
> +	void (*handler)(struct airq_struct *airq, struct tpi_info *tpi_info);
>  	u8 *lsi_ptr;			/* Local-Summary-Indicator pointer */
>  	u8 lsi_mask;			/* Local-Summary-Indicator mask */
>  	u8 isc;				/* Interrupt-subclass */
> diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
> index c3bd993fdd0c..f9b872e358c6 100644
> --- a/arch/s390/kvm/interrupt.c
> +++ b/arch/s390/kvm/interrupt.c
> @@ -28,6 +28,7 @@
>  #include <asm/switch_to.h>
>  #include <asm/nmi.h>
>  #include <asm/airq.h>
> +#include <asm/tpi.h>
>  #include "kvm-s390.h"
>  #include "gaccess.h"
>  #include "trace-s390.h"
> @@ -3261,7 +3262,8 @@ int kvm_s390_gisc_unregister(struct kvm *kvm, u32 gisc)
>  }
>  EXPORT_SYMBOL_GPL(kvm_s390_gisc_unregister);
>  
> -static void gib_alert_irq_handler(struct airq_struct *airq, bool floating)
> +static void gib_alert_irq_handler(struct airq_struct *airq,
> +				  struct tpi_info *tpi_info)
>  {
>  	inc_irq_stat(IRQIO_GAL);
>  	process_gib_alert_list();
> diff --git a/arch/s390/pci/pci_irq.c b/arch/s390/pci/pci_irq.c
> index 954bb7a83124..880bcd73f11a 100644
> --- a/arch/s390/pci/pci_irq.c
> +++ b/arch/s390/pci/pci_irq.c
> @@ -11,6 +11,7 @@
>  
>  #include <asm/isc.h>
>  #include <asm/airq.h>
> +#include <asm/tpi.h>
>  
>  static enum {FLOATING, DIRECTED} irq_delivery;
>  
> @@ -216,8 +217,11 @@ static void zpci_handle_fallback_irq(void)
>  	}
>  }
>  
> -static void zpci_directed_irq_handler(struct airq_struct *airq, bool floating)
> +static void zpci_directed_irq_handler(struct airq_struct *airq,
> +				      struct tpi_info *tpi_info)
>  {
> +	bool floating = !tpi_info->directed_irq;
> +
>  	if (floating) {
>  		inc_irq_stat(IRQIO_PCF);
>  		zpci_handle_fallback_irq();
> @@ -227,7 +231,8 @@ static void zpci_directed_irq_handler(struct airq_struct *airq, bool floating)
>  	}
>  }
>  
> -static void zpci_floating_irq_handler(struct airq_struct *airq, bool floating)
> +static void zpci_floating_irq_handler(struct airq_struct *airq,
> +				      struct tpi_info *tpi_info)
>  {
>  	unsigned long si, ai;
>  	struct airq_iv *aibv;
> diff --git a/drivers/s390/cio/airq.c b/drivers/s390/cio/airq.c
> index e56535c99888..2f2226786319 100644
> --- a/drivers/s390/cio/airq.c
> +++ b/drivers/s390/cio/airq.c
> @@ -99,7 +99,7 @@ static irqreturn_t do_airq_interrupt(int irq, void *dummy)
>  	rcu_read_lock();
>  	hlist_for_each_entry_rcu(airq, head, list)
>  		if ((*airq->lsi_ptr & airq->lsi_mask) != 0)
> -			airq->handler(airq, !tpi_info->directed_irq);
> +			airq->handler(airq, tpi_info);
>  	rcu_read_unlock();
>  
>  	return IRQ_HANDLED;
> diff --git a/drivers/s390/cio/qdio_thinint.c b/drivers/s390/cio/qdio_thinint.c
> index 8e09bf3a2fcd..9b9335dd06db 100644
> --- a/drivers/s390/cio/qdio_thinint.c
> +++ b/drivers/s390/cio/qdio_thinint.c
> @@ -15,6 +15,7 @@
>  #include <asm/qdio.h>
>  #include <asm/airq.h>
>  #include <asm/isc.h>
> +#include <asm/tpi.h>
>  
>  #include "cio.h"
>  #include "ioasm.h"
> @@ -93,9 +94,10 @@ static inline u32 clear_shared_ind(void)
>  /**
>   * tiqdio_thinint_handler - thin interrupt handler for qdio
>   * @airq: pointer to adapter interrupt descriptor
> - * @floating: flag to recognize floating vs. directed interrupts (unused)
> + * @tpi_info: interrupt information (e.g. floating vs directed -- unused)
>   */
> -static void tiqdio_thinint_handler(struct airq_struct *airq, bool floating)
> +static void tiqdio_thinint_handler(struct airq_struct *airq,
> +				   struct tpi_info *tpi_info)
>  {
>  	u64 irq_time = S390_lowcore.int_clock;
>  	u32 si_used = clear_shared_ind();
> diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
> index 1986243f9cd3..df1a038442db 100644
> --- a/drivers/s390/crypto/ap_bus.c
> +++ b/drivers/s390/crypto/ap_bus.c
> @@ -27,6 +27,7 @@
>  #include <linux/kthread.h>
>  #include <linux/mutex.h>
>  #include <asm/airq.h>
> +#include <asm/tpi.h>
>  #include <linux/atomic.h>
>  #include <asm/isc.h>
>  #include <linux/hrtimer.h>
> @@ -129,7 +130,8 @@ static int ap_max_adapter_id = 63;
>  static struct bus_type ap_bus_type;
>  
>  /* Adapter interrupt definitions */
> -static void ap_interrupt_handler(struct airq_struct *airq, bool floating);
> +static void ap_interrupt_handler(struct airq_struct *airq,
> +				 struct tpi_info *tpi_info);
>  
>  static bool ap_irq_flag;
>  
> @@ -442,9 +444,10 @@ static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused)
>  /**
>   * ap_interrupt_handler() - Schedule ap_tasklet on interrupt
>   * @airq: pointer to adapter interrupt descriptor
> - * @floating: ignored
> + * @tpi_info: ignored
>   */
> -static void ap_interrupt_handler(struct airq_struct *airq, bool floating)
> +static void ap_interrupt_handler(struct airq_struct *airq,
> +				 struct tpi_info *tpi_info)
>  {
>  	inc_irq_stat(IRQIO_APB);
>  	tasklet_schedule(&ap_tasklet);
> diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
> index d35e7a3f7067..52c376d15978 100644
> --- a/drivers/s390/virtio/virtio_ccw.c
> +++ b/drivers/s390/virtio/virtio_ccw.c
> @@ -33,6 +33,7 @@
>  #include <asm/virtio-ccw.h>
>  #include <asm/isc.h>
>  #include <asm/airq.h>
> +#include <asm/tpi.h>
>  
>  /*
>   * virtio related functions
> @@ -203,7 +204,8 @@ static void drop_airq_indicator(struct virtqueue *vq, struct airq_info *info)
>  	write_unlock_irqrestore(&info->lock, flags);
>  }
>  
> -static void virtio_airq_handler(struct airq_struct *airq, bool floating)
> +static void virtio_airq_handler(struct airq_struct *airq,
> +				struct tpi_info *tpi_info)
>  {
>  	struct airq_info *info = container_of(airq, struct airq_info, airq);
>  	unsigned long ai;