Commit fbf0a7f4 authored by Gerd Hoffmann's avatar Gerd Hoffmann

drm/qxl: get vga ioports

qxl has two modes: "native" (used by the drm driver) and "vga" (vga
compatibility mode, typically used for boot display and firmware
framebuffers).

Accessing any vga ioport will switch the qxl device into vga mode.
The qxl driver never does that, but other drivers accessing vga ports
can trigger that too and therefore disturb qxl operation.  So aquire
the legacy vga ioports from vgaarb to avoid that.

Reproducer: Boot kvm guest with both qxl and i915 vgpu, with qxl being
first in pci scan order.

v2: Skip this for secondary qxl cards which don't have vga mode in the
    first place (Frediano).

Cc: Frediano Ziglio <fziglio@redhat.com>
Signed-off-by: default avatarGerd Hoffmann <kraxel@redhat.com>
Reviewed-by: default avatarDave Airlie <airlied@redhat.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20190805105401.29874-1-kraxel@redhat.com
parent 63daf4e1
...@@ -59,6 +59,11 @@ module_param_named(num_heads, qxl_num_crtc, int, 0400); ...@@ -59,6 +59,11 @@ module_param_named(num_heads, qxl_num_crtc, int, 0400);
static struct drm_driver qxl_driver; static struct drm_driver qxl_driver;
static struct pci_driver qxl_pci_driver; static struct pci_driver qxl_pci_driver;
static bool is_vga(struct pci_dev *pdev)
{
return pdev->class == PCI_CLASS_DISPLAY_VGA << 8;
}
static int static int
qxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) qxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{ {
...@@ -83,9 +88,17 @@ qxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) ...@@ -83,9 +88,17 @@ qxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
if (ret) if (ret)
goto disable_pci; goto disable_pci;
if (is_vga(pdev)) {
ret = vga_get_interruptible(pdev, VGA_RSRC_LEGACY_IO);
if (ret) {
DRM_ERROR("can't get legacy vga ioports\n");
goto disable_pci;
}
}
ret = qxl_device_init(qdev, &qxl_driver, pdev); ret = qxl_device_init(qdev, &qxl_driver, pdev);
if (ret) if (ret)
goto disable_pci; goto put_vga;
ret = qxl_modeset_init(qdev); ret = qxl_modeset_init(qdev);
if (ret) if (ret)
...@@ -105,6 +118,9 @@ qxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) ...@@ -105,6 +118,9 @@ qxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
qxl_modeset_fini(qdev); qxl_modeset_fini(qdev);
unload: unload:
qxl_device_fini(qdev); qxl_device_fini(qdev);
put_vga:
if (is_vga(pdev))
vga_put(pdev, VGA_RSRC_LEGACY_IO);
disable_pci: disable_pci:
pci_disable_device(pdev); pci_disable_device(pdev);
free_dev: free_dev:
...@@ -122,6 +138,8 @@ qxl_pci_remove(struct pci_dev *pdev) ...@@ -122,6 +138,8 @@ qxl_pci_remove(struct pci_dev *pdev)
qxl_modeset_fini(qdev); qxl_modeset_fini(qdev);
qxl_device_fini(qdev); qxl_device_fini(qdev);
if (is_vga(pdev))
vga_put(pdev, VGA_RSRC_LEGACY_IO);
dev->dev_private = NULL; dev->dev_private = NULL;
kfree(qdev); kfree(qdev);
......
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