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[Qemu-devel] [PATCH v4 07/11] vfio/ccw: get io region info
From: |
Dong Jia Shi |
Subject: |
[Qemu-devel] [PATCH v4 07/11] vfio/ccw: get io region info |
Date: |
Fri, 17 Mar 2017 04:19:24 +0100 |
vfio-ccw provides an MMIO region for I/O operations. We fetch its
information via ioctls here, then we can use it performing I/O
instructions and retrieving I/O results later on.
Signed-off-by: Dong Jia Shi <address@hidden>
---
hw/vfio/ccw.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 52 insertions(+)
diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
index d5ff02f..1df2512 100644
--- a/hw/vfio/ccw.c
+++ b/hw/vfio/ccw.c
@@ -12,6 +12,7 @@
*/
#include <linux/vfio.h>
+#include <linux/vfio_ccw.h>
#include <sys/ioctl.h>
#include "qemu/osdep.h"
@@ -26,6 +27,9 @@
typedef struct VFIOCCWDevice {
S390CCWDevice cdev;
VFIODevice vdev;
+ uint64_t io_region_size;
+ uint64_t io_region_offset;
+ struct ccw_io_region *io_region;
} VFIOCCWDevice;
static void vfio_ccw_compute_needs_reset(VFIODevice *vdev)
@@ -50,6 +54,46 @@ static void vfio_ccw_reset(DeviceState *dev)
ioctl(vcdev->vdev.fd, VFIO_DEVICE_RESET);
}
+static void vfio_ccw_get_region(VFIOCCWDevice *vcdev, Error **errp)
+{
+ VFIODevice *vdev = &vcdev->vdev;
+ struct vfio_region_info *info;
+ int ret;
+
+ /* Sanity check device */
+ if (!(vdev->flags & VFIO_DEVICE_FLAGS_CCW)) {
+ error_setg(errp, "vfio: Um, this isn't a vfio-ccw device");
+ return;
+ }
+
+ if (vdev->num_regions < VFIO_CCW_CONFIG_REGION_INDEX + 1) {
+ error_setg(errp, "vfio: Unexpected number of the I/O region %u",
+ vdev->num_regions);
+ return;
+ }
+
+ ret = vfio_get_region_info(vdev, VFIO_CCW_CONFIG_REGION_INDEX, &info);
+ if (ret) {
+ error_setg(errp, "vfio: Error getting config info: %d", ret);
+ return;
+ }
+
+ vcdev->io_region_size = info->size;
+ if (sizeof(*vcdev->io_region) != vcdev->io_region_size) {
+ error_setg(errp, "vfio: Unexpected size of the I/O region");
+ return;
+ }
+ vcdev->io_region_offset = info->offset;
+ vcdev->io_region = g_malloc0(info->size);
+
+ g_free(info);
+}
+
+static void vfio_ccw_put_region(VFIOCCWDevice *vcdev)
+{
+ g_free(vcdev->io_region);
+}
+
static void vfio_put_device(VFIOCCWDevice *vcdev)
{
g_free(vcdev->vdev.name);
@@ -144,8 +188,15 @@ static void vfio_ccw_realize(DeviceState *dev, Error
**errp)
goto out_device_err;
}
+ vfio_ccw_get_region(vcdev, errp);
+ if (*errp) {
+ goto out_region_err;
+ }
+
return;
+out_region_err:
+ vfio_put_device(vcdev);
out_device_err:
vfio_ccw_put_group(group, path);
out_group_err:
@@ -166,6 +217,7 @@ static void vfio_ccw_unrealize(DeviceState *dev, Error
**errp)
cdc->unrealize(cdev, errp);
}
+ vfio_ccw_put_region(vcdev);
vfio_put_device(vcdev);
vfio_put_group(group);
}
--
2.8.4
- [Qemu-devel] [PATCH v4 00/11] basic channel IO passthrough infrastructure based on vfio, Dong Jia Shi, 2017/03/16
- [Qemu-devel] [PATCH v4 01/11] vfio: linux-headers update for vfio-ccw, Dong Jia Shi, 2017/03/16
- [Qemu-devel] [PATCH v4 02/11] s390x/css: add s390-squash-mcss machine option, Dong Jia Shi, 2017/03/16
- [Qemu-devel] [PATCH v4 03/11] s390x/css: realize css_sch_build_schib, Dong Jia Shi, 2017/03/16
- [Qemu-devel] [PATCH v4 04/11] s390x/css: realize css_create_sch, Dong Jia Shi, 2017/03/16
- [Qemu-devel] [PATCH v4 05/11] s390x/css: device support for s390-ccw passthrough, Dong Jia Shi, 2017/03/16
- [Qemu-devel] [PATCH v4 06/11] vfio/ccw: vfio based subchannel passthrough driver, Dong Jia Shi, 2017/03/16
- [Qemu-devel] [PATCH v4 07/11] vfio/ccw: get io region info,
Dong Jia Shi <=
- [Qemu-devel] [PATCH v4 08/11] vfio/ccw: get irqs info and set the eventfd fd, Dong Jia Shi, 2017/03/16
- [Qemu-devel] [PATCH v4 09/11] s390x/css: introduce and realize ccw-request callback, Dong Jia Shi, 2017/03/16
- [Qemu-devel] [PATCH v4 10/11] s390x/css: ccw translation infrastructure, Dong Jia Shi, 2017/03/16
- [Qemu-devel] [PATCH v4 11/11] vfio/ccw: update sense data if a unit check is pending, Dong Jia Shi, 2017/03/16