[PATCH] drm/vmwgfx: Turn off support for multisample count != 0 v2

[Thomas Hellstrom <thellstrom@xxxxxxxxxx>]

Do this until we know how much MOB memory to allocate for these surfaces.
v2: Mask also non-DX multisample.

Signed-off-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
Reviewed-by: Brian Paul <brianp@xxxxxxxxxx>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c   | 22 ++++++++++++++++++++--
 drivers/gpu/drm/vmwgfx/vmwgfx_surface.c |  2 ++
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c
index 0a970af..a3e3c83 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c
@@ -122,6 +122,22 @@ int vmw_getparam_ioctl(struct drm_device *dev, void *data,
 	return 0;
 }
 
+static u32 vmw_mask_multisample(unsigned int cap, u32 fmt_value)
+{
+	/* If the header is updated, update the format test as well! */
+	BUILD_BUG_ON(SVGA3D_DEVCAP_DXFMT_BC5_UNORM + 1 != SVGA3D_DEVCAP_MAX);
+
+	if (cap >= SVGA3D_DEVCAP_DXFMT_X8R8G8B8 &&
+	    cap <= SVGA3D_DEVCAP_DXFMT_BC5_UNORM)
+		fmt_value &= ~(SVGADX_DXFMT_MULTISAMPLE_2 |
+			       SVGADX_DXFMT_MULTISAMPLE_4 |
+			       SVGADX_DXFMT_MULTISAMPLE_8);
+	else if (cap == SVGA3D_DEVCAP_MULTISAMPLE_MASKABLESAMPLES)
+		return 0;
+
+	return fmt_value;
+}
+
 static int vmw_fill_compat_cap(struct vmw_private *dev_priv, void *bounce,
 			       size_t size)
 {
@@ -147,7 +163,8 @@ static int vmw_fill_compat_cap(struct vmw_private *dev_priv, void *bounce,
 	for (i = 0; i < max_size; ++i) {
 		vmw_write(dev_priv, SVGA_REG_DEV_CAP, i);
 		compat_cap->pairs[i][0] = i;
-		compat_cap->pairs[i][1] = vmw_read(dev_priv, SVGA_REG_DEV_CAP);
+		compat_cap->pairs[i][1] = vmw_mask_multisample
+			(i, vmw_read(dev_priv, SVGA_REG_DEV_CAP));
 	}
 	spin_unlock(&dev_priv->cap_lock);
 
@@ -202,7 +219,8 @@ int vmw_get_cap_3d_ioctl(struct drm_device *dev, void *data,
 		spin_lock(&dev_priv->cap_lock);
 		for (i = 0; i < num; ++i) {
 			vmw_write(dev_priv, SVGA_REG_DEV_CAP, i);
-			*bounce32++ = vmw_read(dev_priv, SVGA_REG_DEV_CAP);
+			*bounce32++ = vmw_mask_multisample
+				(i, vmw_read(dev_priv, SVGA_REG_DEV_CAP));
 		}
 		spin_unlock(&dev_priv->cap_lock);
 	} else if (gb_objects) {
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
index 03f63c7..7d620e8 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
@@ -1291,6 +1291,8 @@ int vmw_gb_surface_define_ioctl(struct drm_device *dev, void *data,
 	uint32_t size;
 	uint32_t backup_handle;
 
+	if (req->multisample_count != 0)
+		return -EINVAL;
 
 	if (unlikely(vmw_user_surface_size == 0))
 		vmw_user_surface_size = ttm_round_pot(sizeof(*user_srf)) +
-- 
2.1.0

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