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[Qemu-devel] [PATCH v5 09/13] vfio/ccw: get irqs info and set the eventf
From: |
Dong Jia Shi |
Subject: |
[Qemu-devel] [PATCH v5 09/13] vfio/ccw: get irqs info and set the eventfd fd |
Date: |
Wed, 12 Apr 2017 07:21:11 +0200 |
vfio-ccw resorts to the eventfd mechanism to communicate with userspace.
We fetch the irqs info via the ioctl VFIO_DEVICE_GET_IRQ_INFO,
register a event notifier to get the eventfd fd which is sent
to kernel via the ioctl VFIO_DEVICE_SET_IRQS, then we can implement
read operation once kernel sends the signal.
Signed-off-by: Dong Jia Shi <address@hidden>
---
hw/vfio/ccw.c | 102 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 102 insertions(+)
diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
index 20a4d1a..5127c87 100644
--- a/hw/vfio/ccw.c
+++ b/hw/vfio/ccw.c
@@ -22,6 +22,7 @@
#include "hw/vfio/vfio-common.h"
#include "hw/s390x/s390-ccw.h"
#include "hw/s390x/ccw-device.h"
+#include "qemu/error-report.h"
#define TYPE_VFIO_CCW "vfio-ccw"
typedef struct VFIOCCWDevice {
@@ -30,6 +31,7 @@ typedef struct VFIOCCWDevice {
uint64_t io_region_size;
uint64_t io_region_offset;
struct ccw_io_region *io_region;
+ EventNotifier io_notifier;
} VFIOCCWDevice;
static void vfio_ccw_compute_needs_reset(VFIODevice *vdev)
@@ -54,6 +56,98 @@ static void vfio_ccw_reset(DeviceState *dev)
ioctl(vcdev->vdev.fd, VFIO_DEVICE_RESET);
}
+static void vfio_ccw_io_notifier_handler(void *opaque)
+{
+ VFIOCCWDevice *vcdev = opaque;
+
+ if (!event_notifier_test_and_clear(&vcdev->io_notifier)) {
+ return;
+ }
+}
+
+static void vfio_ccw_register_io_notifier(VFIOCCWDevice *vcdev, Error **errp)
+{
+ VFIODevice *vdev = &vcdev->vdev;
+ struct vfio_irq_info *irq_info;
+ struct vfio_irq_set *irq_set;
+ size_t argsz;
+ int32_t *pfd;
+
+ if (vdev->num_irqs < VFIO_CCW_IO_IRQ_INDEX + 1) {
+ error_setg(errp, "vfio: unexpected number of io irqs %u",
+ vdev->num_irqs);
+ return;
+ }
+
+ argsz = sizeof(*irq_set);
+ irq_info = g_malloc0(argsz);
+ irq_info->index = VFIO_CCW_IO_IRQ_INDEX;
+ irq_info->argsz = argsz;
+ if (ioctl(vdev->fd, VFIO_DEVICE_GET_IRQ_INFO,
+ irq_info) < 0 || irq_info->count < 1) {
+ error_setg(errp, "vfio: Error getting irq info");
+ goto get_error;
+ }
+
+ if (event_notifier_init(&vcdev->io_notifier, 0)) {
+ error_setg(errp, "vfio: Unable to init event notifier for IO");
+ goto get_error;
+ }
+
+ argsz = sizeof(*irq_set) + sizeof(*pfd);
+ irq_set = g_malloc0(argsz);
+ irq_set->argsz = argsz;
+ irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
+ VFIO_IRQ_SET_ACTION_TRIGGER;
+ irq_set->index = VFIO_CCW_IO_IRQ_INDEX;
+ irq_set->start = 0;
+ irq_set->count = 1;
+ pfd = (int32_t *) &irq_set->data;
+
+ *pfd = event_notifier_get_fd(&vcdev->io_notifier);
+ qemu_set_fd_handler(*pfd, vfio_ccw_io_notifier_handler, NULL, vcdev);
+ if (ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set)) {
+ error_setg(errp, "vfio: Failed to set up io notification");
+ qemu_set_fd_handler(*pfd, NULL, NULL, vcdev);
+ event_notifier_cleanup(&vcdev->io_notifier);
+ goto set_error;
+ }
+
+set_error:
+ g_free(irq_set);
+
+get_error:
+ g_free(irq_info);
+}
+
+static void vfio_ccw_unregister_io_notifier(VFIOCCWDevice *vcdev)
+{
+ struct vfio_irq_set *irq_set;
+ size_t argsz;
+ int32_t *pfd;
+
+ argsz = sizeof(*irq_set) + sizeof(*pfd);
+ irq_set = g_malloc0(argsz);
+ irq_set->argsz = argsz;
+ irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
+ VFIO_IRQ_SET_ACTION_TRIGGER;
+ irq_set->index = VFIO_CCW_IO_IRQ_INDEX;
+ irq_set->start = 0;
+ irq_set->count = 1;
+ pfd = (int32_t *) &irq_set->data;
+ *pfd = -1;
+
+ if (ioctl(vcdev->vdev.fd, VFIO_DEVICE_SET_IRQS, irq_set)) {
+ error_report("vfio: Failed to de-assign device io fd");
+ }
+
+ qemu_set_fd_handler(event_notifier_get_fd(&vcdev->io_notifier),
+ NULL, NULL, vcdev);
+ event_notifier_cleanup(&vcdev->io_notifier);
+
+ g_free(irq_set);
+}
+
static void vfio_ccw_get_region(VFIOCCWDevice *vcdev, Error **errp)
{
VFIODevice *vdev = &vcdev->vdev;
@@ -193,8 +287,15 @@ static void vfio_ccw_realize(DeviceState *dev, Error
**errp)
goto out_region_err;
}
+ vfio_ccw_register_io_notifier(vcdev, errp);
+ if (*errp) {
+ goto out_notifier_err;
+ }
+
return;
+out_notifier_err:
+ vfio_ccw_put_region(vcdev);
out_region_err:
vfio_put_device(vcdev);
out_device_err:
@@ -217,6 +318,7 @@ static void vfio_ccw_unrealize(DeviceState *dev, Error
**errp)
cdc->unrealize(cdev, errp);
}
+ vfio_ccw_unregister_io_notifier(vcdev);
vfio_ccw_put_region(vcdev);
vfio_put_device(vcdev);
vfio_put_group(group);
--
2.10.2
- [Qemu-devel] [PATCH v5 00/13] basic channel IO passthrough infrastructure based on vfio, Dong Jia Shi, 2017/04/12
- [Qemu-devel] [PATCH v5 01/13] update-linux-headers: update for vfio-ccw, Dong Jia Shi, 2017/04/12
- [Qemu-devel] [PATCH v5 02/13] vfio: linux-headers update for vfio-ccw, Dong Jia Shi, 2017/04/12
- [Qemu-devel] [PATCH v5 04/13] s390x/css: realize css_sch_build_schib, Dong Jia Shi, 2017/04/12
- [Qemu-devel] [PATCH v5 03/13] s390x/css: add s390-squash-mcss machine option, Dong Jia Shi, 2017/04/12
- [Qemu-devel] [PATCH v5 05/13] s390x/css: realize css_create_sch, Dong Jia Shi, 2017/04/12
- [Qemu-devel] [PATCH v5 07/13] vfio/ccw: vfio based subchannel passthrough driver, Dong Jia Shi, 2017/04/12
- [Qemu-devel] [PATCH v5 06/13] s390x/css: device support for s390-ccw passthrough, Dong Jia Shi, 2017/04/12
- [Qemu-devel] [PATCH v5 08/13] vfio/ccw: get io region info, Dong Jia Shi, 2017/04/12
- [Qemu-devel] [PATCH v5 09/13] vfio/ccw: get irqs info and set the eventfd fd,
Dong Jia Shi <=
- [Qemu-devel] [PATCH v5 10/13] s390x/css: introduce and realize ccw-request callback, Dong Jia Shi, 2017/04/12
- [Qemu-devel] [PATCH v5 11/13] s390x/css: ccw translation infrastructure, Dong Jia Shi, 2017/04/12
- [Qemu-devel] [PATCH v5 12/13] vfio/ccw: update sense data if a unit check is pending, Dong Jia Shi, 2017/04/12
- [Qemu-devel] [PATCH v5 13/13] MAINTAINERS: Add vfio-ccw maintainer, Dong Jia Shi, 2017/04/12