drm/i915/gvt: Emulate PCI expansion ROM base address register

Our vGPU doesn't have a device ROM, we need follow the PCI spec to
report this info to drivers. Otherwise, we would see below errors.

Inspecting possible rom at 0xfe049000 (vd=8086:1912 bdf=00:10.0)
qemu-system-x86_64: vfio-pci: Cannot read device rom at 00000000-0000-0000-0000-000000000001
Device option ROM contents are probably invalid (check dmesg).
Skip option ROM probe with rombar=0, or load from file with romfile=No option rom signature (got 4860)

I will also send a improvement patch to PCI subsystem related to PCI ROM.
But no idea to omit below error, since no pattern to detect vbios shadow
without touch its content.
0000:00:10.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0x0000

Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
(cherry picked from commit c4270d122ccff963a021d1beb893d6192336af96)

1 files changed, 21 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/gvt/cfg_space.c b/drivers/gpu/drm/i915/gvt/cfg_space.c
index ab19545d59a1..4ce2e6bd0680 100644
--- a/drivers/gpu/drm/i915/gvt/cfg_space.c
+++ b/drivers/gpu/drm/i915/gvt/cfg_space.c
@@ -208,6 +208,20 @@ static int emulate_pci_command_write(struct intel_vgpu *vgpu,
         return 0;
 }
 
+static int emulate_pci_rom_bar_write(struct intel_vgpu *vgpu,
+        unsigned int offset, void *p_data, unsigned int bytes)
+{
+        u32 *pval = (u32 *)(vgpu_cfg_space(vgpu) + offset);
+        u32 new = *(u32 *)(p_data);
+
+        if ((new & PCI_ROM_ADDRESS_MASK) == PCI_ROM_ADDRESS_MASK)
+                /* We don't have rom, return size of 0. */
+                *pval = 0;
+        else
+                vgpu_pci_cfg_mem_write(vgpu, offset, p_data, bytes);
+        return 0;
+}
+
 static int emulate_pci_bar_write(struct intel_vgpu *vgpu, unsigned int offset,
         void *p_data, unsigned int bytes)
 {
@@ -300,6 +314,11 @@ int intel_vgpu_emulate_cfg_write(struct intel_vgpu *vgpu, unsigned int offset,
         }
 
         switch (rounddown(offset, 4)) {
+        case PCI_ROM_ADDRESS:
+                if (WARN_ON(!IS_ALIGNED(offset, 4)))
+                        return -EINVAL;
+                return emulate_pci_rom_bar_write(vgpu, offset, p_data, bytes);
+
         case PCI_BASE_ADDRESS_0 ... PCI_BASE_ADDRESS_5:
                 if (WARN_ON(!IS_ALIGNED(offset, 4)))
                         return -EINVAL;
@@ -375,6 +394,8 @@ void intel_vgpu_init_cfg_space(struct intel_vgpu *vgpu,
                                 pci_resource_len(gvt->dev_priv->drm.pdev, 0);
         vgpu->cfg_space.bar[INTEL_GVT_PCI_BAR_APERTURE].size =
                                 pci_resource_len(gvt->dev_priv->drm.pdev, 2);
+
+        memset(vgpu_cfg_space(vgpu) + PCI_ROM_ADDRESS, 0, 4);
 }
 
 /**