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Date: Mon, 13 Dec 2021 15:35:08 +0100
From: Pierre Morel <pmorel@...ux.ibm.com>
To: Matthew Rosato <mjrosato@...ux.ibm.com>, linux-s390@...r.kernel.org
Cc: alex.williamson@...hat.com, cohuck@...hat.com,
schnelle@...ux.ibm.com, farman@...ux.ibm.com,
borntraeger@...ux.ibm.com, hca@...ux.ibm.com, gor@...ux.ibm.com,
gerald.schaefer@...ux.ibm.com, agordeev@...ux.ibm.com,
frankja@...ux.ibm.com, david@...hat.com, imbrenda@...ux.ibm.com,
vneethv@...ux.ibm.com, oberpar@...ux.ibm.com, freude@...ux.ibm.com,
thuth@...hat.com, pasic@...ux.ibm.com, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/32] s390/airq: pass more TPI info to airq handlers
On 12/7/21 21:57, Matthew Rosato 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@...ux.ibm.com>
> Signed-off-by: Matthew Rosato <mjrosato@...ux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@...ux.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;
>
--
Pierre Morel
IBM Lab Boeblingen
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