@@ -3960,7 +3960,7 @@ int amdgpu_device_init(struct amdgpu_device *adev,
/* this will fail for cards that aren't VGA class devices, just
* ignore it */
if ((adev->pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
- vga_client_register(adev->pdev, amdgpu_device_vga_set_decode);
+ vga_client_register(adev->pdev, amdgpu_device_vga_set_decode, NULL);
px = amdgpu_device_supports_px(ddev);
@@ -115,7 +115,6 @@ intel_vga_set_decode(struct pci_dev *pdev, bool enable_decode)
int intel_vga_register(struct drm_i915_private *i915)
{
-
struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
int ret;
@@ -127,7 +126,7 @@ int intel_vga_register(struct drm_i915_private *i915)
* then we do not take part in VGA arbitration and the
* vga_client_register() fails with -ENODEV.
*/
- ret = vga_client_register(pdev, intel_vga_set_decode);
+ ret = vga_client_register(pdev, intel_vga_set_decode, NULL);
if (ret && ret != -ENODEV)
return ret;
@@ -92,7 +92,7 @@ nouveau_vga_init(struct nouveau_drm *drm)
return;
pdev = to_pci_dev(dev->dev);
- vga_client_register(pdev, nouveau_vga_set_decode);
+ vga_client_register(pdev, nouveau_vga_set_decode, NULL);
/* don't register Thunderbolt eGPU with vga_switcheroo */
if (pci_is_thunderbolt_attached(pdev))
@@ -1425,7 +1425,7 @@ int radeon_device_init(struct radeon_device *rdev,
/* if we have > 1 VGA cards, then disable the radeon VGA resources */
/* this will fail for cards that aren't VGA class devices, just
* ignore it */
- vga_client_register(rdev->pdev, radeon_vga_set_decode);
+ vga_client_register(rdev->pdev, radeon_vga_set_decode, NULL);
if (rdev->flags & RADEON_IS_PX)
runtime = true;
@@ -53,6 +53,7 @@ struct vga_device {
bool bridge_has_one_vga;
bool is_firmware_default; /* device selected by firmware */
unsigned int (*set_decode)(struct pci_dev *pdev, bool decode);
+ bool (*is_boot_device)(struct pci_dev *pdev);
};
static LIST_HEAD(vga_list);
@@ -615,10 +616,17 @@ static bool vga_is_boot_device(struct vga_device *vgadev)
if (boot_vga && boot_vga->is_firmware_default)
return false;
- if (vga_is_firmware_default(pdev)) {
- vgadev->is_firmware_default = true;
+ /*
+ * Ask the device driver first, if registered. Fallback to the
+ * default implement if the callback is non-exist.
+ */
+ if (vgadev->is_boot_device)
+ vgadev->is_firmware_default = vgadev->is_boot_device(pdev);
+ else
+ vgadev->is_firmware_default = vga_is_firmware_default(pdev);
+
+ if (vgadev->is_firmware_default)
return true;
- }
/*
* A legacy VGA device has MEM and IO enabled and any bridges
@@ -958,6 +966,10 @@ EXPORT_SYMBOL(vga_set_legacy_decoding);
* @set_decode callback: If a client can disable its GPU VGA resource, it
* will get a callback from this to set the encode/decode state.
*
+ * @is_boot_device: callback to the device driver, query if a client is the
+ * default boot device, as the device driver typically has better knowledge
+ * if specific device is the boot device. But this callback is optional.
+ *
* Rationale: we cannot disable VGA decode resources unconditionally, some
* single GPU laptops seem to require ACPI or BIOS access to the VGA registers
* to control things like backlights etc. Hopefully newer multi-GPU laptops do
@@ -973,7 +985,8 @@ EXPORT_SYMBOL(vga_set_legacy_decoding);
* Returns: 0 on success, -1 on failure
*/
int vga_client_register(struct pci_dev *pdev,
- unsigned int (*set_decode)(struct pci_dev *pdev, bool decode))
+ unsigned int (*set_decode)(struct pci_dev *pdev, bool decode),
+ bool (*is_boot_device)(struct pci_dev *pdev))
{
int ret = -ENODEV;
struct vga_device *vgadev;
@@ -985,6 +998,7 @@ int vga_client_register(struct pci_dev *pdev,
goto bail;
vgadev->set_decode = set_decode;
+ vgadev->is_boot_device = is_boot_device;
ret = 0;
bail:
@@ -2067,7 +2067,7 @@ static int vfio_pci_vga_init(struct vfio_pci_core_device *vdev)
if (ret)
return ret;
- ret = vga_client_register(pdev, vfio_pci_set_decode);
+ ret = vga_client_register(pdev, vfio_pci_set_decode, NULL);
if (ret)
return ret;
vga_set_legacy_decoding(pdev, vfio_pci_set_decode(pdev, false));
@@ -50,7 +50,8 @@ struct pci_dev *vga_default_device(void);
void vga_set_default_device(struct pci_dev *pdev);
int vga_remove_vgacon(struct pci_dev *pdev);
int vga_client_register(struct pci_dev *pdev,
- unsigned int (*set_decode)(struct pci_dev *pdev, bool state));
+ unsigned int (*set_decode)(struct pci_dev *pdev, bool state),
+ bool (*is_boot_device)(struct pci_dev *pdev));
#else /* CONFIG_VGA_ARB */
static inline void vga_set_legacy_decoding(struct pci_dev *pdev,
unsigned int decodes)
@@ -76,7 +77,8 @@ static inline int vga_remove_vgacon(struct pci_dev *pdev)
return 0;
}
static inline int vga_client_register(struct pci_dev *pdev,
- unsigned int (*set_decode)(struct pci_dev *pdev, bool state))
+ unsigned int (*set_decode)(struct pci_dev *pdev, bool state),
+ bool (*is_boot_device)(struct pci_dev *pdev))
{
return 0;
}
@@ -114,7 +116,7 @@ static inline int vga_get_uninterruptible(struct pci_dev *pdev,
static inline void vga_client_unregister(struct pci_dev *pdev)
{
- vga_client_register(pdev, NULL);
+ vga_client_register(pdev, NULL, NULL);
}
#endif /* LINUX_VGA_H */