[PATCH 4/7] xen/events: link interdomain events to associated xenbus device

Juergen Gross
2021-02-06T10:52:10Z

In order to support the possibility of per-device event channel
settings (e.g. lateeoi spurious event thresholds) add a xenbus device
pointer to struct irq_info() and modify the related event channel
binding interfaces to take the pointer to the xenbus device as a
parameter instead of the domain id of the other side.

While at it remove the stale prototype of bind_evtchn_to_irq_lateeoi().

Signed-off-by: Juergen Gross <jgross@suse.com>
---
drivers/block/xen-blkback/xenbus.c | 2 +-
drivers/net/xen-netback/interface.c | 16 +++++------
drivers/xen/events/events_base.c | 41 +++++++++++++++++------------
drivers/xen/pvcalls-back.c | 4 +--
drivers/xen/xen-pciback/xenbus.c | 2 +-
drivers/xen/xen-scsiback.c | 2 +-
include/xen/events.h | 7 ++---
7 files changed, 41 insertions(+), 33 deletions(-)

diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c
index 9860d4842f36..c2aaf690352c 100644
--- a/drivers/block/xen-blkback/xenbus.c
+++ b/drivers/block/xen-blkback/xenbus.c
@@ -245,7 +245,7 @@ static int xen_blkif_map(struct xen_blkif_ring *ring, grant_ref_t *gref,
if (req_prod - rsp_prod > size)
goto fail;

- err = bind_interdomain_evtchn_to_irqhandler_lateeoi(blkif->domid,
+ err = bind_interdomain_evtchn_to_irqhandler_lateeoi(blkif->be->dev,
evtchn, xen_blkif_be_int, 0, "blkif-backend", ring);
if (err < 0)
goto fail;
diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index acb786d8b1d8..494b4330a4ea 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -628,13 +628,13 @@ int xenvif_connect_ctrl(struct xenvif *vif, grant_ref_t ring_ref,
unsigned int evtchn)
{
struct net_device *dev = vif->dev;
+ struct xenbus_device *xendev = xenvif_to_xenbus_device(vif);
void *addr;
struct xen_netif_ctrl_sring *shared;
RING_IDX rsp_prod, req_prod;
int err;

- err = xenbus_map_ring_valloc(xenvif_to_xenbus_device(vif),
- &ring_ref, 1, &addr);
+ err = xenbus_map_ring_valloc(xendev, &ring_ref, 1, &addr);
if (err)
goto err;

@@ -648,7 +648,7 @@ int xenvif_connect_ctrl(struct xenvif *vif, grant_ref_t ring_ref,
if (req_prod - rsp_prod > RING_SIZE(&vif->ctrl))
goto err_unmap;

- err = bind_interdomain_evtchn_to_irq_lateeoi(vif->domid, evtchn);
+ err = bind_interdomain_evtchn_to_irq_lateeoi(xendev, evtchn);
if (err < 0)
goto err_unmap;

@@ -671,8 +671,7 @@ int xenvif_connect_ctrl(struct xenvif *vif, grant_ref_t ring_ref,
vif->ctrl_irq = 0;

err_unmap:
- xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(vif),
- vif->ctrl.sring);
+ xenbus_unmap_ring_vfree(xendev, vif->ctrl.sring);
vif->ctrl.sring = NULL;

err:
@@ -717,6 +716,7 @@ int xenvif_connect_data(struct xenvif_queue *queue,
unsigned int tx_evtchn,
unsigned int rx_evtchn)
{
+ struct xenbus_device *dev = xenvif_to_xenbus_device(queue->vif);
struct task_struct *task;
int err;

@@ -753,7 +753,7 @@ int xenvif_connect_data(struct xenvif_queue *queue,
if (tx_evtchn == rx_evtchn) {
/* feature-split-event-channels == 0 */
err = bind_interdomain_evtchn_to_irqhandler_lateeoi(
- queue->vif->domid, tx_evtchn, xenvif_interrupt, 0,
+ dev, tx_evtchn, xenvif_interrupt, 0,
queue->name, queue);
if (err < 0)
goto err;
@@ -764,7 +764,7 @@ int xenvif_connect_data(struct xenvif_queue *queue,
snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name),
"%s-tx", queue->name);
err = bind_interdomain_evtchn_to_irqhandler_lateeoi(
- queue->vif->domid, tx_evtchn, xenvif_tx_interrupt, 0,
+ dev, tx_evtchn, xenvif_tx_interrupt, 0,
queue->tx_irq_name, queue);
if (err < 0)
goto err;
@@ -774,7 +774,7 @@ int xenvif_connect_data(struct xenvif_queue *queue,
snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name),
"%s-rx", queue->name);
err = bind_interdomain_evtchn_to_irqhandler_lateeoi(
- queue->vif->domid, rx_evtchn, xenvif_rx_interrupt, 0,
+ dev, rx_evtchn, xenvif_rx_interrupt, 0,
queue->rx_irq_name, queue);
if (err < 0)
goto err;
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index 7b26ef817f8b..8c620c11e32a 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -63,6 +63,7 @@
#include <xen/interface/physdev.h>
#include <xen/interface/sched.h>
#include <xen/interface/vcpu.h>
+#include <xen/xenbus.h>
#include <asm/hw_irq.h>

#include "events_internal.h"
@@ -117,6 +118,7 @@ struct irq_info {
unsigned char flags;
uint16_t domid;
} pirq;
+ struct xenbus_device *interdomain;
} u;
};

@@ -317,11 +319,16 @@ static int xen_irq_info_common_setup(struct irq_info *info,
}

static int xen_irq_info_evtchn_setup(unsigned irq,
- evtchn_port_t evtchn)
+ evtchn_port_t evtchn,
+ struct xenbus_device *dev)
{
struct irq_info *info = info_for_irq(irq);
+ int ret;

- return xen_irq_info_common_setup(info, irq, IRQT_EVTCHN, evtchn, 0);
+ ret = xen_irq_info_common_setup(info, irq, IRQT_EVTCHN, evtchn, 0);
+ info->u.interdomain = dev;
+
+ return ret;
}

static int xen_irq_info_ipi_setup(unsigned cpu,
@@ -1128,7 +1135,8 @@ int xen_pirq_from_irq(unsigned irq)
}
EXPORT_SYMBOL_GPL(xen_pirq_from_irq);

-static int bind_evtchn_to_irq_chip(evtchn_port_t evtchn, struct irq_chip *chip)
+static int bind_evtchn_to_irq_chip(evtchn_port_t evtchn, struct irq_chip *chip,
+ struct xenbus_device *dev)
{
int irq;
int ret;
@@ -1148,7 +1156,7 @@ static int bind_evtchn_to_irq_chip(evtchn_port_t evtchn, struct irq_chip *chip)
irq_set_chip_and_handler_name(irq, chip,
handle_edge_irq, "event");

- ret = xen_irq_info_evtchn_setup(irq, evtchn);
+ ret = xen_irq_info_evtchn_setup(irq, evtchn, dev);
if (ret < 0) {
__unbind_from_irq(irq);
irq = ret;
@@ -1175,7 +1183,7 @@ static int bind_evtchn_to_irq_chip(evtchn_port_t evtchn, struct irq_chip *chip)

int bind_evtchn_to_irq(evtchn_port_t evtchn)
{
- return bind_evtchn_to_irq_chip(evtchn, &xen_dynamic_chip);
+ return bind_evtchn_to_irq_chip(evtchn, &xen_dynamic_chip, NULL);
}
EXPORT_SYMBOL_GPL(bind_evtchn_to_irq);

@@ -1224,27 +1232,27 @@ static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
return irq;
}

-static int bind_interdomain_evtchn_to_irq_chip(unsigned int remote_domain,
+static int bind_interdomain_evtchn_to_irq_chip(struct xenbus_device *dev,
evtchn_port_t remote_port,
struct irq_chip *chip)
{
struct evtchn_bind_interdomain bind_interdomain;
int err;

- bind_interdomain.remote_dom = remote_domain;
+ bind_interdomain.remote_dom = dev->otherend_id;
bind_interdomain.remote_port = remote_port;

err = HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain,
&bind_interdomain);

return err ? : bind_evtchn_to_irq_chip(bind_interdomain.local_port,
- chip);
+ chip, dev);
}

-int bind_interdomain_evtchn_to_irq_lateeoi(unsigned int remote_domain,
+int bind_interdomain_evtchn_to_irq_lateeoi(struct xenbus_device *dev,
evtchn_port_t remote_port)
{
- return bind_interdomain_evtchn_to_irq_chip(remote_domain, remote_port,
+ return bind_interdomain_evtchn_to_irq_chip(dev, remote_port,
&xen_lateeoi_chip);
}
EXPORT_SYMBOL_GPL(bind_interdomain_evtchn_to_irq_lateeoi);
@@ -1357,7 +1365,7 @@ static int bind_evtchn_to_irqhandler_chip(evtchn_port_t evtchn,
{
int irq, retval;

- irq = bind_evtchn_to_irq_chip(evtchn, chip);
+ irq = bind_evtchn_to_irq_chip(evtchn, chip, NULL);
if (irq < 0)
return irq;
retval = request_irq(irq, handler, irqflags, devname, dev_id);
@@ -1392,14 +1400,13 @@ int bind_evtchn_to_irqhandler_lateeoi(evtchn_port_t evtchn,
EXPORT_SYMBOL_GPL(bind_evtchn_to_irqhandler_lateeoi);

static int bind_interdomain_evtchn_to_irqhandler_chip(
- unsigned int remote_domain, evtchn_port_t remote_port,
+ struct xenbus_device *dev, evtchn_port_t remote_port,
irq_handler_t handler, unsigned long irqflags,
const char *devname, void *dev_id, struct irq_chip *chip)
{
int irq, retval;

- irq = bind_interdomain_evtchn_to_irq_chip(remote_domain, remote_port,
- chip);
+ irq = bind_interdomain_evtchn_to_irq_chip(dev, remote_port, chip);
if (irq < 0)
return irq;

@@ -1412,14 +1419,14 @@ static int bind_interdomain_evtchn_to_irqhandler_chip(
return irq;
}

-int bind_interdomain_evtchn_to_irqhandler_lateeoi(unsigned int remote_domain,
+int bind_interdomain_evtchn_to_irqhandler_lateeoi(struct xenbus_device *dev,
evtchn_port_t remote_port,
irq_handler_t handler,
unsigned long irqflags,
const char *devname,
void *dev_id)
{
- return bind_interdomain_evtchn_to_irqhandler_chip(remote_domain,
+ return bind_interdomain_evtchn_to_irqhandler_chip(dev,
remote_port, handler, irqflags, devname,
dev_id, &xen_lateeoi_chip);
}
@@ -1691,7 +1698,7 @@ void rebind_evtchn_irq(evtchn_port_t evtchn, int irq)
so there should be a proper type */
BUG_ON(info->type == IRQT_UNBOUND);

- (void)xen_irq_info_evtchn_setup(irq, evtchn);
+ (void)xen_irq_info_evtchn_setup(irq, evtchn, NULL);

mutex_unlock(&irq_mapping_update_lock);

diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c
index a7d293fa8d14..b47fd8435061 100644
--- a/drivers/xen/pvcalls-back.c
+++ b/drivers/xen/pvcalls-back.c
@@ -348,7 +348,7 @@ static struct sock_mapping *pvcalls_new_active_socket(
map->bytes = page;

ret = bind_interdomain_evtchn_to_irqhandler_lateeoi(
- fedata->dev->otherend_id, evtchn,
+ fedata->dev, evtchn,
pvcalls_back_conn_event, 0, "pvcalls-backend", map);
if (ret < 0)
goto out;
@@ -948,7 +948,7 @@ static int backend_connect(struct xenbus_device *dev)
goto error;
}

- err = bind_interdomain_evtchn_to_irq_lateeoi(dev->otherend_id, evtchn);
+ err = bind_interdomain_evtchn_to_irq_lateeoi(dev, evtchn);
if (err < 0)
goto error;
fedata->irq = err;
diff --git a/drivers/xen/xen-pciback/xenbus.c b/drivers/xen/xen-pciback/xenbus.c
index e7c692cfb2cf..5188f02e75fb 100644
--- a/drivers/xen/xen-pciback/xenbus.c
+++ b/drivers/xen/xen-pciback/xenbus.c
@@ -124,7 +124,7 @@ static int xen_pcibk_do_attach(struct xen_pcibk_device *pdev, int gnt_ref,
pdev->sh_info = vaddr;

err = bind_interdomain_evtchn_to_irqhandler_lateeoi(
- pdev->xdev->otherend_id, remote_evtchn, xen_pcibk_handle_event,
+ pdev->xdev, remote_evtchn, xen_pcibk_handle_event,
0, DRV_NAME, pdev);
if (err < 0) {
xenbus_dev_fatal(pdev->xdev, err,
diff --git a/drivers/xen/xen-scsiback.c b/drivers/xen/xen-scsiback.c
index 862162dca33c..8b59897b2df9 100644
--- a/drivers/xen/xen-scsiback.c
+++ b/drivers/xen/xen-scsiback.c
@@ -799,7 +799,7 @@ static int scsiback_init_sring(struct vscsibk_info *info, grant_ref_t ring_ref,
sring = (struct vscsiif_sring *)area;
BACK_RING_INIT(&info->ring, sring, PAGE_SIZE);

- err = bind_interdomain_evtchn_to_irq_lateeoi(info->domid, evtchn);
+ err = bind_interdomain_evtchn_to_irq_lateeoi(info->dev, evtchn);
if (err < 0)
goto unmap_page;

diff --git a/include/xen/events.h b/include/xen/events.h
index 8ec418e30c7f..c204262d9fc2 100644
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -12,10 +12,11 @@
#include <asm/xen/hypercall.h>
#include <asm/xen/events.h>

+struct xenbus_device;
+
unsigned xen_evtchn_nr_channels(void);

int bind_evtchn_to_irq(evtchn_port_t evtchn);
-int bind_evtchn_to_irq_lateeoi(evtchn_port_t evtchn);
int bind_evtchn_to_irqhandler(evtchn_port_t evtchn,
irq_handler_t handler,
unsigned long irqflags, const char *devname,
@@ -35,9 +36,9 @@ int bind_ipi_to_irqhandler(enum ipi_vector ipi,
unsigned long irqflags,
const char *devname,
void *dev_id);
-int bind_interdomain_evtchn_to_irq_lateeoi(unsigned int remote_domain,
+int bind_interdomain_evtchn_to_irq_lateeoi(struct xenbus_device *dev,
evtchn_port_t remote_port);
-int bind_interdomain_evtchn_to_irqhandler_lateeoi(unsigned int remote_domain,
+int bind_interdomain_evtchn_to_irqhandler_lateeoi(struct xenbus_device *dev,
evtchn_port_t remote_port,
irq_handler_t handler,
unsigned long irqflags,
--
2.26.2