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    Subject[PATCH 4.4 069/146] drm/radeon: fix asic initialization for virtualized environments
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Alex Deucher <alexander.deucher@amd.com>

    commit 05082b8bbd1a0ffc74235449c4b8930a8c240f85 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: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/gpu/drm/radeon/radeon_device.c | 21 +++++++++++++++++++++
    1 file changed, 21 insertions(+)

    --- a/drivers/gpu/drm/radeon/radeon_device.c
    +++ b/drivers/gpu/drm/radeon/radeon_device.c
    @@ -630,6 +630,23 @@ void radeon_gtt_location(struct radeon_d
    /*
    * 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_de
    {
    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) &&

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