drm/i915/gvt: add write handler for mmio mbctl

Guest will write mmio mbctl which need a special handler in gvt to
clear the bit 4 to inidcate the write operation success.

V2: use bit definition macro to make code readable.

Signed-off-by: Pei Zhang <pei.zhang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
index eaff45d..6da9ae1 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/handlers.c
+++ b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -970,6 +970,14 @@ static int dp_aux_ch_ctl_mmio_write(struct intel_vgpu *vgpu,
        return 0;
 }
 
+static int mbctl_write(struct intel_vgpu *vgpu, unsigned int offset,
+               void *p_data, unsigned int bytes)
+{
+       *(u32 *)p_data &= (~GEN6_MBCTL_ENABLE_BOOT_FETCH);
+       write_vreg(vgpu, offset, p_data, bytes);
+       return 0;
+}
+
 static int vga_control_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
                void *p_data, unsigned int bytes)
 {
@@ -2238,7 +2246,7 @@ static int init_generic_mmio_info(struct intel_gvt *gvt)
        MMIO_D(0x7180, D_ALL);
        MMIO_D(0x7408, D_ALL);
        MMIO_D(0x7c00, D_ALL);
-       MMIO_D(GEN6_MBCTL, D_ALL);
+       MMIO_DH(GEN6_MBCTL, D_ALL, NULL, mbctl_write);
        MMIO_D(0x911c, D_ALL);
        MMIO_D(0x9120, D_ALL);
        MMIO_DFH(GEN7_UCGCTL4, D_ALL, F_CMD_ACCESS, NULL, NULL);