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Subject[PATCH v2 4/4] Add virtio-vga bits.
Date
---
drivers/gpu/drm/virtio/virtgpu_drm_bus.c | 32 ++++++++++++++++++++++++++++++--
drivers/virtio/virtio_pci_common.c | 7 ++++++-
2 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drm_bus.c b/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
index 56bd4ed..33d12d5 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
+++ b/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
@@ -37,6 +37,26 @@ int drm_virtio_set_busid(struct drm_device *dev, struct drm_master *master)
return 0;
}

+static void virtio_pci_kick_out_firmware_fb(struct pci_dev *pci_dev)
+{
+ struct apertures_struct *ap;
+ bool primary;
+
+ ap = alloc_apertures(1);
+ if (!ap)
+ return;
+
+ ap->ranges[0].base = pci_resource_start(pci_dev, 2);
+ ap->ranges[0].size = pci_resource_len(pci_dev, 2);
+
+ primary = pci_dev->resource[PCI_ROM_RESOURCE].flags
+ & IORESOURCE_ROM_SHADOW;
+
+ remove_conflicting_framebuffers(ap, "virtiodrmfb", primary);
+
+ kfree(ap);
+}
+
int drm_virtio_init(struct drm_driver *driver, struct virtio_device *vdev)
{
struct drm_device *dev;
@@ -48,8 +68,16 @@ int drm_virtio_init(struct drm_driver *driver, struct virtio_device *vdev)
dev->virtdev = vdev;
vdev->priv = dev;

- if (strcmp(vdev->dev.parent->bus->name, "pci") == 0)
- dev->pdev = to_pci_dev(vdev->dev.parent);
+ if (strcmp(vdev->dev.parent->bus->name, "pci") == 0) {
+ struct pci_dev *pdev = to_pci_dev(vdev->dev.parent);
+ bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
+
+ DRM_INFO("pci: %s detected\n",
+ vga ? "virtio-vga" : "virtio-gpu-pci");
+ dev->pdev = pdev;
+ if (vga)
+ virtio_pci_kick_out_firmware_fb(pdev);
+ }

ret = drm_dev_register(dev, 0);
if (ret)
diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index e894eb2..36d82e8 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -510,7 +510,12 @@ static int virtio_pci_probe(struct pci_dev *pci_dev,
goto err_enable_device;

rc = pci_request_regions(pci_dev, "virtio-pci");
- if (rc)
+ /*
+ * virtio-vga: vesafb/efifb might hold vga framebuffer
+ * resource, but don't fail on that, we'll kick out vesafb
+ * later on.
+ */
+ if (rc && ((pci_dev->class >> 8) != PCI_CLASS_DISPLAY_VGA))
goto err_request_regions;

if (force_legacy) {
--
1.8.3.1


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