Commit 256e0cae authored by Alex Deucher's avatar Alex Deucher Committed by Ben Hutchings

drm/radeon: fix asic initialization for virtualized environments

commit 05082b8b upstream.

When executing in a PCI passthrough based virtuzliation environment, the
hypervisor will usually attempt to send a PCIe bus reset signal to the
ASIC when the VM reboots. In this scenario, the card is not correctly
initialized, but we still consider it to be posted. Therefore, in a
passthrough based environemnt we should always post the card to guarantee
it is in a good state for driver initialization.

Ported from amdgpu commit:
amdgpu: fix asic initialization for virtualized environments

Cc: Andres Rodriguez <andres.rodriguez@amd.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent 7e1e5ca4
......@@ -350,10 +350,31 @@ void radeon_gtt_location(struct radeon_device *rdev, struct radeon_mc *mc)
/*
* GPU helpers function.
*/
/**
* radeon_device_is_virtual - check if we are running is a virtual environment
*
* Check if the asic has been passed through to a VM (all asics).
* Used at driver startup.
* Returns true if virtual or false if not.
*/
static bool radeon_device_is_virtual(void)
{
#ifdef CONFIG_X86
return boot_cpu_has(X86_FEATURE_HYPERVISOR);
#else
return false;
#endif
}
bool radeon_card_posted(struct radeon_device *rdev)
{
uint32_t reg;
/* for pass through, always force asic_init */
if (radeon_device_is_virtual())
return false;
if (efi_enabled(EFI_BOOT) &&
rdev->pdev->subsystem_vendor == PCI_VENDOR_ID_APPLE)
return false;
......
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