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Commit 05082b8b authored by Alex Deucher's avatar Alex Deucher
Browse files

drm/radeon: fix asic initialization for virtualized environments 



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>
Cc: stable@vger.kernel.org
parent 048765ad

drivers/gpu/drm/radeon/radeon_device.c

+21 −0
Original line number Diff line number Diff line
@@ -630,6 +630,23 @@ 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

}



/**

 * radeon_card_posted - check if the hw has already been initialized

 *
@@ -643,6 +660,10 @@ 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;



	/* required for EFI mode on macbook2,1 which uses an r5xx asic */

	if (efi_enabled(EFI_BOOT) &&

	    (rdev->pdev->subsystem_vendor == PCI_VENDOR_ID_APPLE) &&