From: Yu Zhang <yu.c.zhang@xxxxxxxxx>
The current XenGT only supports alias ppgtt. And the emulation
is done in XenGT host by first trapping PP_DIR_BASE mmio
accesses. Updating PP_DIR_BASE by using instructions such as
MI_LOAD_REGISTER_IMM are hard to emulate and are not supported
in current XenGT. Therefore this patch also added a new callback
routine - vgpu_mm_switch() to set the PP_DIR_BASE by mmio writes.
Signed-off-by: Yu Zhang <yu.c.zhang@xxxxxxxxx>
Signed-off-by: Jike Song <jike.song@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_dma.c | 5 +++++
drivers/gpu/drm/i915/i915_gem_gtt.c | 14 ++++++++++++++
2 files changed, 19 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index a3fe7c0..63dccd2 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1746,6 +1746,11 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
i915.enable_fbc = 0;
intel_vgpu_reg_write_init(dev);
+
+ if (USES_FULL_PPGTT(dev)) {
+ DRM_INFO("Only support alias ppgtt for now in VM.\n");
+ i915.enable_ppgtt = 1;
+ }
}
intel_irq_init(dev);
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 368262d..e61d66f 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -898,6 +898,17 @@ static int hsw_mm_switch(struct i915_hw_ppgtt *ppgtt,
return 0;
}
+static int vgpu_mm_switch(struct i915_hw_ppgtt *ppgtt,
+ struct intel_engine_cs *ring)
+{
+ struct drm_device *dev = ppgtt->base.dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ I915_WRITE(RING_PP_DIR_DCLV(ring), PP_DIR_DCLV_2G);
+ I915_WRITE(RING_PP_DIR_BASE(ring), get_pd_offset(ppgtt));
+ return 0;
+}
+
static int gen7_mm_switch(struct i915_hw_ppgtt *ppgtt,
struct intel_engine_cs *ring)
{
@@ -1224,6 +1235,9 @@ static int gen6_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
} else
BUG();
+ if (intel_vgpu_active(dev))
+ ppgtt->switch_mm = vgpu_mm_switch;
+
ret = gen6_ppgtt_alloc(ppgtt);
if (ret)
return ret;
--
1.9.1
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