[v6,7/9] vfio/display: core & wireup

Submitted by Gerd Hoffmann on Feb. 28, 2018, 12:31 p.m.

Details

Message ID 20180228123110.6507-8-kraxel@redhat.com
State New
Headers show
Series "vfio: add display support" ( rev: 2 ) in Intel GVT devel

Not browsing as part of any series.

Commit Message

Gerd Hoffmann Feb. 28, 2018, 12:31 p.m.
Infrastructure for display support.  Must be enabled
using 'display' property.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/vfio/pci.h         |  4 ++++
 hw/vfio/display.c     | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/vfio/pci.c         | 10 +++++++++
 hw/vfio/Makefile.objs |  2 +-
 4 files changed, 71 insertions(+), 1 deletion(-)
 create mode 100644 hw/vfio/display.c

Patch hide | download patch | download mbox

diff --git a/hw/vfio/pci.h b/hw/vfio/pci.h
index f4aa13e021..a846cf6237 100644
--- a/hw/vfio/pci.h
+++ b/hw/vfio/pci.h
@@ -133,6 +133,7 @@  typedef struct VFIOPCIDevice {
 #define VFIO_FEATURE_ENABLE_IGD_OPREGION_BIT 2
 #define VFIO_FEATURE_ENABLE_IGD_OPREGION \
                                 (1 << VFIO_FEATURE_ENABLE_IGD_OPREGION_BIT)
+    OnOffAuto display;
     int32_t bootindex;
     uint32_t igd_gms;
     OffAutoPCIBAR msix_relo;
@@ -174,4 +175,7 @@  int vfio_pci_igd_opregion_init(VFIOPCIDevice *vdev,
                                struct vfio_region_info *info,
                                Error **errp);
 
+int vfio_display_probe(VFIOPCIDevice *vdev, Error **errp);
+void vfio_display_finalize(VFIOPCIDevice *vdev);
+
 #endif /* HW_VFIO_VFIO_PCI_H */
diff --git a/hw/vfio/display.c b/hw/vfio/display.c
new file mode 100644
index 0000000000..3e997f8a44
--- /dev/null
+++ b/hw/vfio/display.c
@@ -0,0 +1,56 @@ 
+/*
+ * display support for mdev based vgpu devices
+ *
+ * Copyright Red Hat, Inc. 2017
+ *
+ * Authors:
+ *    Gerd Hoffmann
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include <linux/vfio.h>
+#include <sys/ioctl.h>
+
+#include "sysemu/sysemu.h"
+#include "ui/console.h"
+#include "qapi/error.h"
+#include "pci.h"
+
+int vfio_display_probe(VFIOPCIDevice *vdev, Error **errp)
+{
+    struct vfio_device_gfx_plane_info probe;
+    int ret;
+
+    memset(&probe, 0, sizeof(probe));
+    probe.argsz = sizeof(probe);
+    probe.flags = VFIO_GFX_PLANE_TYPE_PROBE | VFIO_GFX_PLANE_TYPE_DMABUF;
+    ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &probe);
+    if (ret == 0) {
+        error_setg(errp, "vfio-display: dmabuf support not implemented yet");
+        return -1;
+    }
+
+    memset(&probe, 0, sizeof(probe));
+    probe.argsz = sizeof(probe);
+    probe.flags = VFIO_GFX_PLANE_TYPE_PROBE | VFIO_GFX_PLANE_TYPE_REGION;
+    ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &probe);
+    if (ret == 0) {
+        error_setg(errp, "vfio-display: region support not implemented yet");
+        return -1;
+    }
+
+    if (vdev->display == ON_OFF_AUTO_AUTO) {
+        /* not an error in automatic mode */
+        return 0;
+    }
+
+    error_setg(errp, "vfio: device doesn't support any (known) display method");
+    return -1;
+}
+
+void vfio_display_finalize(VFIOPCIDevice *vdev)
+{
+}
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 033cc8dea1..20f93bef74 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -3015,6 +3015,13 @@  static void vfio_realize(PCIDevice *pdev, Error **errp)
         }
     }
 
+    if (vdev->display != ON_OFF_AUTO_OFF) {
+        ret = vfio_display_probe(vdev, errp);
+        if (ret) {
+            goto out_teardown;
+        }
+    }
+
     vfio_register_err_notifier(vdev);
     vfio_register_req_notifier(vdev);
     vfio_setup_resetfn_quirk(vdev);
@@ -3035,6 +3042,7 @@  static void vfio_instance_finalize(Object *obj)
     VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pci_dev);
     VFIOGroup *group = vdev->vbasedev.group;
 
+    vfio_display_finalize(vdev);
     vfio_bars_finalize(vdev);
     g_free(vdev->emulated_config_bits);
     g_free(vdev->rom);
@@ -3123,6 +3131,8 @@  static void vfio_instance_init(Object *obj)
 static Property vfio_pci_dev_properties[] = {
     DEFINE_PROP_PCI_HOST_DEVADDR("host", VFIOPCIDevice, host),
     DEFINE_PROP_STRING("sysfsdev", VFIOPCIDevice, vbasedev.sysfsdev),
+    DEFINE_PROP_ON_OFF_AUTO("display", VFIOPCIDevice,
+                            display, ON_OFF_AUTO_AUTO),
     DEFINE_PROP_UINT32("x-intx-mmap-timeout-ms", VFIOPCIDevice,
                        intx.mmap_timeout, 1100),
     DEFINE_PROP_BIT("x-vga", VFIOPCIDevice, features,
diff --git a/hw/vfio/Makefile.objs b/hw/vfio/Makefile.objs
index c3ab9097f1..a2e7a0a7cf 100644
--- a/hw/vfio/Makefile.objs
+++ b/hw/vfio/Makefile.objs
@@ -1,6 +1,6 @@ 
 ifeq ($(CONFIG_LINUX), y)
 obj-$(CONFIG_SOFTMMU) += common.o
-obj-$(CONFIG_PCI) += pci.o pci-quirks.o
+obj-$(CONFIG_PCI) += pci.o pci-quirks.o display.o
 obj-$(CONFIG_VFIO_CCW) += ccw.o
 obj-$(CONFIG_SOFTMMU) += platform.o
 obj-$(CONFIG_VFIO_XGMAC) += calxeda-xgmac.o

Comments

> diff --git a/hw/vfio/display.c b/hw/vfio/display.c
> new file mode 100644
> index 0000000000..3e997f8a44
> --- /dev/null
> +++ b/hw/vfio/display.c
> @@ -0,0 +1,56 @@
> +/*
> + * display support for mdev based vgpu devices
> + *
> + * Copyright Red Hat, Inc. 2017

Just curious here since I don't really know close to nothing about the legal
stuff, but isn't vGPU NVIDIA's trademark - [1,2,3] (especially [1]) would
suggest so. Therefore, I'm just curious whether we can mention this as we
please, especially when this should also work for Intel, which uses a different
name for the technology. On the other hand, grepping through kernel modules,
there's a lot of vGPU misuse in Intel's context, so I guess everything's fine.
Again, I'm just curious since I have no clue about this stuff.

[1] https://www.geforce.com/en_GB/gfecnt/support/NVIDIA-Legal-Notices
[2] https://trademarks.justia.com/859/42/vgpu-85942337.html
[3] https://trademarks.justia.com/859/42/nvidia-grid-85942341.html

Erik
On Mon, 5 Mar 2018 09:52:39 +0100
Erik Skultety <eskultet@redhat.com> wrote:

> > diff --git a/hw/vfio/display.c b/hw/vfio/display.c
> > new file mode 100644
> > index 0000000000..3e997f8a44
> > --- /dev/null
> > +++ b/hw/vfio/display.c
> > @@ -0,0 +1,56 @@
> > +/*
> > + * display support for mdev based vgpu devices
> > + *
> > + * Copyright Red Hat, Inc. 2017  
> 
> Just curious here since I don't really know close to nothing about the legal
> stuff, but isn't vGPU NVIDIA's trademark - [1,2,3] (especially [1]) would
> suggest so. Therefore, I'm just curious whether we can mention this as we
> please, especially when this should also work for Intel, which uses a different
> name for the technology. On the other hand, grepping through kernel modules,
> there's a lot of vGPU misuse in Intel's context, so I guess everything's fine.
> Again, I'm just curious since I have no clue about this stuff.
> 
> [1] https://www.geforce.com/en_GB/gfecnt/support/NVIDIA-Legal-Notices
> [2] https://trademarks.justia.com/859/42/vgpu-85942337.html
> [3] https://trademarks.justia.com/859/42/nvidia-grid-85942341.html

IANAL, but the official trademark trackers all seem to indicate "VGPU"
was filed for, but abandoned, so perhaps your link [1] above is stale
data (note that the copyright date on that is 2014 and the trademark
abandonment dates are late 2014/early 2015).  I'm not sure that it
matters either way though.  Thanks,

Alex