diff mbox

[v7,08/13] vfio/ccw: get io region info

Message ID 20170505020352.8984-9-bjsdjshi@linux.vnet.ibm.com (mailing list archive)
State New, archived
Headers show

Commit Message

Dong Jia Shi May 5, 2017, 2:03 a.m. UTC 
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 <bjsdjshi@linux.vnet.ibm.com>
---
 hw/vfio/ccw.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

Comments

Eric Auger May 9, 2017, 8:20 a.m. UTC | #1 
Hi,

On 05/05/2017 04:03, Dong Jia Shi wrote:
> 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 <bjsdjshi@linux.vnet.ibm.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>

Thanks

Eric
> ---
>  hw/vfio/ccw.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 54 insertions(+)
> 
> diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
> index 7d2497c..7ddcfd7 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 +54,48 @@ 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_errno(errp, -ret, "vfio: Error getting config info");
> +        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");
> +        g_free(info);
> +        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);
> @@ -122,8 +168,15 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp)
>          goto out_device_err;
>      }
>  
> +    vfio_ccw_get_region(vcdev, &err);
> +    if (err) {
> +        goto out_region_err;
> +    }
> +
>      return;
>  
> +out_region_err:
> +    vfio_put_device(vcdev);
>  out_device_err:
>      vfio_put_group(group);
>  out_group_err:
> @@ -142,6 +195,7 @@ static void vfio_ccw_unrealize(DeviceState *dev, Error **errp)
>      S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
>      VFIOGroup *group = vcdev->vdev.group;
>  
> +    vfio_ccw_put_region(vcdev);
>      vfio_put_device(vcdev);
>      vfio_put_group(group);
>  
>
Alex Williamson May 11, 2017, 9:48 p.m. UTC | #2 
On Fri,  5 May 2017 04:03:47 +0200
Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com> wrote:

> 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 <bjsdjshi@linux.vnet.ibm.com>
> ---


Acked-by: Alex Williamson <alex.williamson@redhat.com>


>  hw/vfio/ccw.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 54 insertions(+)
> 
> diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
> index 7d2497c..7ddcfd7 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 +54,48 @@ 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_errno(errp, -ret, "vfio: Error getting config info");
> +        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");
> +        g_free(info);
> +        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);
> @@ -122,8 +168,15 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp)
>          goto out_device_err;
>      }
>  
> +    vfio_ccw_get_region(vcdev, &err);
> +    if (err) {
> +        goto out_region_err;
> +    }
> +
>      return;
>  
> +out_region_err:
> +    vfio_put_device(vcdev);
>  out_device_err:
>      vfio_put_group(group);
>  out_group_err:
> @@ -142,6 +195,7 @@ static void vfio_ccw_unrealize(DeviceState *dev, Error **errp)
>      S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
>      VFIOGroup *group = vcdev->vdev.group;
>  
> +    vfio_ccw_put_region(vcdev);
>      vfio_put_device(vcdev);
>      vfio_put_group(group);
>
diff mbox

Patch

diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
index 7d2497c..7ddcfd7 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 +54,48 @@  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_errno(errp, -ret, "vfio: Error getting config info");
+        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");
+        g_free(info);
+        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);
@@ -122,8 +168,15 @@  static void vfio_ccw_realize(DeviceState *dev, Error **errp)
         goto out_device_err;
     }
 
+    vfio_ccw_get_region(vcdev, &err);
+    if (err) {
+        goto out_region_err;
+    }
+
     return;
 
+out_region_err:
+    vfio_put_device(vcdev);
 out_device_err:
     vfio_put_group(group);
 out_group_err:
@@ -142,6 +195,7 @@  static void vfio_ccw_unrealize(DeviceState *dev, Error **errp)
     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
     VFIOGroup *group = vcdev->vdev.group;
 
+    vfio_ccw_put_region(vcdev);
     vfio_put_device(vcdev);
     vfio_put_group(group);